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77accbf5 | 1 | /* |
1da177e4 LT |
2 | * Serial port driver for the ETRAX 100LX chip |
3 | * | |
77accbf5 | 4 | * Copyright (C) 1998-2007 Axis Communications AB |
1da177e4 LT |
5 | * |
6 | * Many, many authors. Based once upon a time on serial.c for 16x50. | |
7 | * | |
1da177e4 LT |
8 | */ |
9 | ||
10 | static char *serial_version = "$Revision: 1.25 $"; | |
11 | ||
1da177e4 LT |
12 | #include <linux/types.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/signal.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/timer.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/tty.h> | |
19 | #include <linux/tty_flip.h> | |
20 | #include <linux/major.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/fcntl.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/init.h> | |
26 | #include <asm/uaccess.h> | |
27 | #include <linux/kernel.h> | |
f392ecfa | 28 | #include <linux/mutex.h> |
1977f032 | 29 | #include <linux/bitops.h> |
1da177e4 LT |
30 | |
31 | #include <asm/io.h> | |
32 | #include <asm/irq.h> | |
77accbf5 | 33 | #include <asm/dma.h> |
1da177e4 | 34 | #include <asm/system.h> |
1da177e4 LT |
35 | #include <linux/delay.h> |
36 | ||
37 | #include <asm/arch/svinto.h> | |
38 | ||
39 | /* non-arch dependent serial structures are in linux/serial.h */ | |
40 | #include <linux/serial.h> | |
41 | /* while we keep our own stuff (struct e100_serial) in a local .h file */ | |
77accbf5 | 42 | #include "crisv10.h" |
1da177e4 | 43 | #include <asm/fasttimer.h> |
77accbf5 | 44 | #include <asm/arch/io_interface_mux.h> |
1da177e4 LT |
45 | |
46 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER | |
47 | #ifndef CONFIG_ETRAX_FAST_TIMER | |
48 | #error "Enable FAST_TIMER to use SERIAL_FAST_TIMER" | |
49 | #endif | |
50 | #endif | |
51 | ||
52 | #if defined(CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS) && \ | |
53 | (CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS == 0) | |
54 | #error "RX_TIMEOUT_TICKS == 0 not allowed, use 1" | |
55 | #endif | |
56 | ||
57 | #if defined(CONFIG_ETRAX_RS485_ON_PA) && defined(CONFIG_ETRAX_RS485_ON_PORT_G) | |
58 | #error "Disable either CONFIG_ETRAX_RS485_ON_PA or CONFIG_ETRAX_RS485_ON_PORT_G" | |
59 | #endif | |
60 | ||
61 | /* | |
62 | * All of the compatibilty code so we can compile serial.c against | |
63 | * older kernels is hidden in serial_compat.h | |
64 | */ | |
65 | #if defined(LOCAL_HEADERS) | |
66 | #include "serial_compat.h" | |
67 | #endif | |
68 | ||
1da177e4 LT |
69 | struct tty_driver *serial_driver; |
70 | ||
1da177e4 LT |
71 | /* number of characters left in xmit buffer before we ask for more */ |
72 | #define WAKEUP_CHARS 256 | |
73 | ||
74 | //#define SERIAL_DEBUG_INTR | |
75 | //#define SERIAL_DEBUG_OPEN | |
76 | //#define SERIAL_DEBUG_FLOW | |
77 | //#define SERIAL_DEBUG_DATA | |
78 | //#define SERIAL_DEBUG_THROTTLE | |
79 | //#define SERIAL_DEBUG_IO /* Debug for Extra control and status pins */ | |
80 | //#define SERIAL_DEBUG_LINE 0 /* What serport we want to debug */ | |
81 | ||
82 | /* Enable this to use serial interrupts to handle when you | |
83 | expect the first received event on the serial port to | |
84 | be an error, break or similar. Used to be able to flash IRMA | |
85 | from eLinux */ | |
86 | #define SERIAL_HANDLE_EARLY_ERRORS | |
87 | ||
1da177e4 LT |
88 | /* Currently 16 descriptors x 128 bytes = 2048 bytes */ |
89 | #define SERIAL_DESCR_BUF_SIZE 256 | |
90 | ||
91 | #define SERIAL_PRESCALE_BASE 3125000 /* 3.125MHz */ | |
92 | #define DEF_BAUD_BASE SERIAL_PRESCALE_BASE | |
93 | ||
94 | /* We don't want to load the system with massive fast timer interrupt | |
95 | * on high baudrates so limit it to 250 us (4kHz) */ | |
96 | #define MIN_FLUSH_TIME_USEC 250 | |
97 | ||
98 | /* Add an x here to log a lot of timer stuff */ | |
99 | #define TIMERD(x) | |
100 | /* Debug details of interrupt handling */ | |
101 | #define DINTR1(x) /* irq on/off, errors */ | |
102 | #define DINTR2(x) /* tx and rx */ | |
103 | /* Debug flip buffer stuff */ | |
104 | #define DFLIP(x) | |
105 | /* Debug flow control and overview of data flow */ | |
106 | #define DFLOW(x) | |
107 | #define DBAUD(x) | |
108 | #define DLOG_INT_TRIG(x) | |
109 | ||
110 | //#define DEBUG_LOG_INCLUDED | |
111 | #ifndef DEBUG_LOG_INCLUDED | |
112 | #define DEBUG_LOG(line, string, value) | |
113 | #else | |
114 | struct debug_log_info | |
115 | { | |
116 | unsigned long time; | |
117 | unsigned long timer_data; | |
118 | // int line; | |
119 | const char *string; | |
120 | int value; | |
121 | }; | |
122 | #define DEBUG_LOG_SIZE 4096 | |
123 | ||
124 | struct debug_log_info debug_log[DEBUG_LOG_SIZE]; | |
125 | int debug_log_pos = 0; | |
126 | ||
127 | #define DEBUG_LOG(_line, _string, _value) do { \ | |
128 | if ((_line) == SERIAL_DEBUG_LINE) {\ | |
129 | debug_log_func(_line, _string, _value); \ | |
130 | }\ | |
131 | }while(0) | |
132 | ||
133 | void debug_log_func(int line, const char *string, int value) | |
134 | { | |
135 | if (debug_log_pos < DEBUG_LOG_SIZE) { | |
136 | debug_log[debug_log_pos].time = jiffies; | |
137 | debug_log[debug_log_pos].timer_data = *R_TIMER_DATA; | |
138 | // debug_log[debug_log_pos].line = line; | |
139 | debug_log[debug_log_pos].string = string; | |
140 | debug_log[debug_log_pos].value = value; | |
141 | debug_log_pos++; | |
142 | } | |
143 | /*printk(string, value);*/ | |
144 | } | |
145 | #endif | |
146 | ||
147 | #ifndef CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS | |
148 | /* Default number of timer ticks before flushing rx fifo | |
149 | * When using "little data, low latency applications: use 0 | |
150 | * When using "much data applications (PPP)" use ~5 | |
151 | */ | |
152 | #define CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS 5 | |
153 | #endif | |
154 | ||
155 | unsigned long timer_data_to_ns(unsigned long timer_data); | |
156 | ||
157 | static void change_speed(struct e100_serial *info); | |
158 | static void rs_throttle(struct tty_struct * tty); | |
159 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); | |
77accbf5 JN |
160 | static int rs_write(struct tty_struct *tty, |
161 | const unsigned char *buf, int count); | |
1da177e4 | 162 | #ifdef CONFIG_ETRAX_RS485 |
77accbf5 JN |
163 | static int e100_write_rs485(struct tty_struct *tty, |
164 | const unsigned char *buf, int count); | |
1da177e4 | 165 | #endif |
77accbf5 | 166 | static int get_lsr_info(struct e100_serial *info, unsigned int *value); |
1da177e4 LT |
167 | |
168 | ||
169 | #define DEF_BAUD 115200 /* 115.2 kbit/s */ | |
170 | #define STD_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST) | |
171 | #define DEF_RX 0x20 /* or SERIAL_CTRL_W >> 8 */ | |
172 | /* Default value of tx_ctrl register: has txd(bit 7)=1 (idle) as default */ | |
173 | #define DEF_TX 0x80 /* or SERIAL_CTRL_B */ | |
174 | ||
175 | /* offsets from R_SERIALx_CTRL */ | |
176 | ||
177 | #define REG_DATA 0 | |
178 | #define REG_DATA_STATUS32 0 /* this is the 32 bit register R_SERIALx_READ */ | |
179 | #define REG_TR_DATA 0 | |
180 | #define REG_STATUS 1 | |
181 | #define REG_TR_CTRL 1 | |
182 | #define REG_REC_CTRL 2 | |
183 | #define REG_BAUD 3 | |
184 | #define REG_XOFF 4 /* this is a 32 bit register */ | |
185 | ||
186 | /* The bitfields are the same for all serial ports */ | |
187 | #define SER_RXD_MASK IO_MASK(R_SERIAL0_STATUS, rxd) | |
188 | #define SER_DATA_AVAIL_MASK IO_MASK(R_SERIAL0_STATUS, data_avail) | |
189 | #define SER_FRAMING_ERR_MASK IO_MASK(R_SERIAL0_STATUS, framing_err) | |
190 | #define SER_PAR_ERR_MASK IO_MASK(R_SERIAL0_STATUS, par_err) | |
191 | #define SER_OVERRUN_MASK IO_MASK(R_SERIAL0_STATUS, overrun) | |
192 | ||
193 | #define SER_ERROR_MASK (SER_OVERRUN_MASK | SER_PAR_ERR_MASK | SER_FRAMING_ERR_MASK) | |
194 | ||
195 | /* Values for info->errorcode */ | |
196 | #define ERRCODE_SET_BREAK (TTY_BREAK) | |
197 | #define ERRCODE_INSERT 0x100 | |
198 | #define ERRCODE_INSERT_BREAK (ERRCODE_INSERT | TTY_BREAK) | |
199 | ||
200 | #define FORCE_EOP(info) *R_SET_EOP = 1U << info->iseteop; | |
201 | ||
202 | /* | |
203 | * General note regarding the use of IO_* macros in this file: | |
204 | * | |
205 | * We will use the bits defined for DMA channel 6 when using various | |
206 | * IO_* macros (e.g. IO_STATE, IO_MASK, IO_EXTRACT) and _assume_ they are | |
207 | * the same for all channels (which of course they are). | |
208 | * | |
209 | * We will also use the bits defined for serial port 0 when writing commands | |
210 | * to the different ports, as these bits too are the same for all ports. | |
211 | */ | |
212 | ||
213 | ||
214 | /* Mask for the irqs possibly enabled in R_IRQ_MASK1_RD etc. */ | |
215 | static const unsigned long e100_ser_int_mask = 0 | |
216 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 | |
217 | | IO_MASK(R_IRQ_MASK1_RD, ser0_data) | IO_MASK(R_IRQ_MASK1_RD, ser0_ready) | |
218 | #endif | |
219 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 | |
220 | | IO_MASK(R_IRQ_MASK1_RD, ser1_data) | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) | |
221 | #endif | |
222 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 | |
223 | | IO_MASK(R_IRQ_MASK1_RD, ser2_data) | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) | |
224 | #endif | |
225 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 | |
226 | | IO_MASK(R_IRQ_MASK1_RD, ser3_data) | IO_MASK(R_IRQ_MASK1_RD, ser3_ready) | |
227 | #endif | |
228 | ; | |
229 | unsigned long r_alt_ser_baudrate_shadow = 0; | |
230 | ||
231 | /* this is the data for the four serial ports in the etrax100 */ | |
232 | /* DMA2(ser2), DMA4(ser3), DMA6(ser0) or DMA8(ser1) */ | |
233 | /* R_DMA_CHx_CLR_INTR, R_DMA_CHx_FIRST, R_DMA_CHx_CMD */ | |
234 | ||
235 | static struct e100_serial rs_table[] = { | |
236 | { .baud = DEF_BAUD, | |
d7283353 | 237 | .ioport = (unsigned char *)R_SERIAL0_CTRL, |
1da177e4 LT |
238 | .irq = 1U << 12, /* uses DMA 6 and 7 */ |
239 | .oclrintradr = R_DMA_CH6_CLR_INTR, | |
240 | .ofirstadr = R_DMA_CH6_FIRST, | |
241 | .ocmdadr = R_DMA_CH6_CMD, | |
242 | .ostatusadr = R_DMA_CH6_STATUS, | |
243 | .iclrintradr = R_DMA_CH7_CLR_INTR, | |
244 | .ifirstadr = R_DMA_CH7_FIRST, | |
245 | .icmdadr = R_DMA_CH7_CMD, | |
246 | .idescradr = R_DMA_CH7_DESCR, | |
247 | .flags = STD_FLAGS, | |
248 | .rx_ctrl = DEF_RX, | |
249 | .tx_ctrl = DEF_TX, | |
250 | .iseteop = 2, | |
77accbf5 JN |
251 | .dma_owner = dma_ser0, |
252 | .io_if = if_serial_0, | |
1da177e4 LT |
253 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
254 | .enabled = 1, | |
255 | #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT | |
256 | .dma_out_enabled = 1, | |
77accbf5 JN |
257 | .dma_out_nbr = SER0_TX_DMA_NBR, |
258 | .dma_out_irq_nbr = SER0_DMA_TX_IRQ_NBR, | |
259 | .dma_out_irq_flags = IRQF_DISABLED, | |
260 | .dma_out_irq_description = "serial 0 dma tr", | |
1da177e4 LT |
261 | #else |
262 | .dma_out_enabled = 0, | |
77accbf5 JN |
263 | .dma_out_nbr = UINT_MAX, |
264 | .dma_out_irq_nbr = 0, | |
265 | .dma_out_irq_flags = 0, | |
266 | .dma_out_irq_description = NULL, | |
1da177e4 LT |
267 | #endif |
268 | #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN | |
269 | .dma_in_enabled = 1, | |
77accbf5 JN |
270 | .dma_in_nbr = SER0_RX_DMA_NBR, |
271 | .dma_in_irq_nbr = SER0_DMA_RX_IRQ_NBR, | |
272 | .dma_in_irq_flags = IRQF_DISABLED, | |
273 | .dma_in_irq_description = "serial 0 dma rec", | |
1da177e4 | 274 | #else |
77accbf5 JN |
275 | .dma_in_enabled = 0, |
276 | .dma_in_nbr = UINT_MAX, | |
277 | .dma_in_irq_nbr = 0, | |
278 | .dma_in_irq_flags = 0, | |
279 | .dma_in_irq_description = NULL, | |
1da177e4 LT |
280 | #endif |
281 | #else | |
282 | .enabled = 0, | |
77accbf5 | 283 | .io_if_description = NULL, |
1da177e4 LT |
284 | .dma_out_enabled = 0, |
285 | .dma_in_enabled = 0 | |
286 | #endif | |
287 | ||
288 | }, /* ttyS0 */ | |
289 | #ifndef CONFIG_SVINTO_SIM | |
290 | { .baud = DEF_BAUD, | |
d7283353 | 291 | .ioport = (unsigned char *)R_SERIAL1_CTRL, |
1da177e4 LT |
292 | .irq = 1U << 16, /* uses DMA 8 and 9 */ |
293 | .oclrintradr = R_DMA_CH8_CLR_INTR, | |
294 | .ofirstadr = R_DMA_CH8_FIRST, | |
295 | .ocmdadr = R_DMA_CH8_CMD, | |
296 | .ostatusadr = R_DMA_CH8_STATUS, | |
297 | .iclrintradr = R_DMA_CH9_CLR_INTR, | |
298 | .ifirstadr = R_DMA_CH9_FIRST, | |
299 | .icmdadr = R_DMA_CH9_CMD, | |
300 | .idescradr = R_DMA_CH9_DESCR, | |
301 | .flags = STD_FLAGS, | |
302 | .rx_ctrl = DEF_RX, | |
303 | .tx_ctrl = DEF_TX, | |
304 | .iseteop = 3, | |
77accbf5 JN |
305 | .dma_owner = dma_ser1, |
306 | .io_if = if_serial_1, | |
1da177e4 LT |
307 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
308 | .enabled = 1, | |
77accbf5 | 309 | .io_if_description = "ser1", |
1da177e4 LT |
310 | #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT |
311 | .dma_out_enabled = 1, | |
77accbf5 JN |
312 | .dma_out_nbr = SER1_TX_DMA_NBR, |
313 | .dma_out_irq_nbr = SER1_DMA_TX_IRQ_NBR, | |
314 | .dma_out_irq_flags = IRQF_DISABLED, | |
315 | .dma_out_irq_description = "serial 1 dma tr", | |
1da177e4 LT |
316 | #else |
317 | .dma_out_enabled = 0, | |
77accbf5 JN |
318 | .dma_out_nbr = UINT_MAX, |
319 | .dma_out_irq_nbr = 0, | |
320 | .dma_out_irq_flags = 0, | |
321 | .dma_out_irq_description = NULL, | |
1da177e4 LT |
322 | #endif |
323 | #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN | |
324 | .dma_in_enabled = 1, | |
77accbf5 JN |
325 | .dma_in_nbr = SER1_RX_DMA_NBR, |
326 | .dma_in_irq_nbr = SER1_DMA_RX_IRQ_NBR, | |
327 | .dma_in_irq_flags = IRQF_DISABLED, | |
328 | .dma_in_irq_description = "serial 1 dma rec", | |
1da177e4 | 329 | #else |
77accbf5 JN |
330 | .dma_in_enabled = 0, |
331 | .dma_in_enabled = 0, | |
332 | .dma_in_nbr = UINT_MAX, | |
333 | .dma_in_irq_nbr = 0, | |
334 | .dma_in_irq_flags = 0, | |
335 | .dma_in_irq_description = NULL, | |
1da177e4 LT |
336 | #endif |
337 | #else | |
338 | .enabled = 0, | |
77accbf5 JN |
339 | .io_if_description = NULL, |
340 | .dma_in_irq_nbr = 0, | |
1da177e4 LT |
341 | .dma_out_enabled = 0, |
342 | .dma_in_enabled = 0 | |
343 | #endif | |
344 | }, /* ttyS1 */ | |
345 | ||
346 | { .baud = DEF_BAUD, | |
d7283353 | 347 | .ioport = (unsigned char *)R_SERIAL2_CTRL, |
1da177e4 LT |
348 | .irq = 1U << 4, /* uses DMA 2 and 3 */ |
349 | .oclrintradr = R_DMA_CH2_CLR_INTR, | |
350 | .ofirstadr = R_DMA_CH2_FIRST, | |
351 | .ocmdadr = R_DMA_CH2_CMD, | |
352 | .ostatusadr = R_DMA_CH2_STATUS, | |
353 | .iclrintradr = R_DMA_CH3_CLR_INTR, | |
354 | .ifirstadr = R_DMA_CH3_FIRST, | |
355 | .icmdadr = R_DMA_CH3_CMD, | |
356 | .idescradr = R_DMA_CH3_DESCR, | |
357 | .flags = STD_FLAGS, | |
358 | .rx_ctrl = DEF_RX, | |
359 | .tx_ctrl = DEF_TX, | |
360 | .iseteop = 0, | |
77accbf5 JN |
361 | .dma_owner = dma_ser2, |
362 | .io_if = if_serial_2, | |
1da177e4 LT |
363 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
364 | .enabled = 1, | |
77accbf5 | 365 | .io_if_description = "ser2", |
1da177e4 LT |
366 | #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT |
367 | .dma_out_enabled = 1, | |
77accbf5 JN |
368 | .dma_out_nbr = SER2_TX_DMA_NBR, |
369 | .dma_out_irq_nbr = SER2_DMA_TX_IRQ_NBR, | |
370 | .dma_out_irq_flags = IRQF_DISABLED, | |
371 | .dma_out_irq_description = "serial 2 dma tr", | |
1da177e4 LT |
372 | #else |
373 | .dma_out_enabled = 0, | |
77accbf5 JN |
374 | .dma_out_nbr = UINT_MAX, |
375 | .dma_out_irq_nbr = 0, | |
376 | .dma_out_irq_flags = 0, | |
377 | .dma_out_irq_description = NULL, | |
1da177e4 LT |
378 | #endif |
379 | #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN | |
380 | .dma_in_enabled = 1, | |
77accbf5 JN |
381 | .dma_in_nbr = SER2_RX_DMA_NBR, |
382 | .dma_in_irq_nbr = SER2_DMA_RX_IRQ_NBR, | |
383 | .dma_in_irq_flags = IRQF_DISABLED, | |
384 | .dma_in_irq_description = "serial 2 dma rec", | |
1da177e4 | 385 | #else |
77accbf5 JN |
386 | .dma_in_enabled = 0, |
387 | .dma_in_nbr = UINT_MAX, | |
388 | .dma_in_irq_nbr = 0, | |
389 | .dma_in_irq_flags = 0, | |
390 | .dma_in_irq_description = NULL, | |
1da177e4 LT |
391 | #endif |
392 | #else | |
393 | .enabled = 0, | |
77accbf5 | 394 | .io_if_description = NULL, |
1da177e4 LT |
395 | .dma_out_enabled = 0, |
396 | .dma_in_enabled = 0 | |
397 | #endif | |
398 | }, /* ttyS2 */ | |
399 | ||
400 | { .baud = DEF_BAUD, | |
d7283353 | 401 | .ioport = (unsigned char *)R_SERIAL3_CTRL, |
1da177e4 LT |
402 | .irq = 1U << 8, /* uses DMA 4 and 5 */ |
403 | .oclrintradr = R_DMA_CH4_CLR_INTR, | |
404 | .ofirstadr = R_DMA_CH4_FIRST, | |
405 | .ocmdadr = R_DMA_CH4_CMD, | |
406 | .ostatusadr = R_DMA_CH4_STATUS, | |
407 | .iclrintradr = R_DMA_CH5_CLR_INTR, | |
408 | .ifirstadr = R_DMA_CH5_FIRST, | |
409 | .icmdadr = R_DMA_CH5_CMD, | |
410 | .idescradr = R_DMA_CH5_DESCR, | |
411 | .flags = STD_FLAGS, | |
412 | .rx_ctrl = DEF_RX, | |
413 | .tx_ctrl = DEF_TX, | |
414 | .iseteop = 1, | |
77accbf5 JN |
415 | .dma_owner = dma_ser3, |
416 | .io_if = if_serial_3, | |
1da177e4 LT |
417 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
418 | .enabled = 1, | |
77accbf5 | 419 | .io_if_description = "ser3", |
1da177e4 LT |
420 | #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT |
421 | .dma_out_enabled = 1, | |
77accbf5 JN |
422 | .dma_out_nbr = SER3_TX_DMA_NBR, |
423 | .dma_out_irq_nbr = SER3_DMA_TX_IRQ_NBR, | |
424 | .dma_out_irq_flags = IRQF_DISABLED, | |
425 | .dma_out_irq_description = "serial 3 dma tr", | |
1da177e4 LT |
426 | #else |
427 | .dma_out_enabled = 0, | |
77accbf5 JN |
428 | .dma_out_nbr = UINT_MAX, |
429 | .dma_out_irq_nbr = 0, | |
430 | .dma_out_irq_flags = 0, | |
431 | .dma_out_irq_description = NULL, | |
1da177e4 LT |
432 | #endif |
433 | #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN | |
434 | .dma_in_enabled = 1, | |
77accbf5 JN |
435 | .dma_in_nbr = SER3_RX_DMA_NBR, |
436 | .dma_in_irq_nbr = SER3_DMA_RX_IRQ_NBR, | |
437 | .dma_in_irq_flags = IRQF_DISABLED, | |
438 | .dma_in_irq_description = "serial 3 dma rec", | |
1da177e4 | 439 | #else |
77accbf5 JN |
440 | .dma_in_enabled = 0, |
441 | .dma_in_nbr = UINT_MAX, | |
442 | .dma_in_irq_nbr = 0, | |
443 | .dma_in_irq_flags = 0, | |
444 | .dma_in_irq_description = NULL | |
1da177e4 LT |
445 | #endif |
446 | #else | |
447 | .enabled = 0, | |
77accbf5 | 448 | .io_if_description = NULL, |
1da177e4 LT |
449 | .dma_out_enabled = 0, |
450 | .dma_in_enabled = 0 | |
451 | #endif | |
452 | } /* ttyS3 */ | |
453 | #endif | |
454 | }; | |
455 | ||
456 | ||
457 | #define NR_PORTS (sizeof(rs_table)/sizeof(struct e100_serial)) | |
458 | ||
606d099c AC |
459 | static struct ktermios *serial_termios[NR_PORTS]; |
460 | static struct ktermios *serial_termios_locked[NR_PORTS]; | |
1da177e4 LT |
461 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
462 | static struct fast_timer fast_timers[NR_PORTS]; | |
463 | #endif | |
464 | ||
465 | #ifdef CONFIG_ETRAX_SERIAL_PROC_ENTRY | |
466 | #define PROCSTAT(x) x | |
467 | struct ser_statistics_type { | |
468 | int overrun_cnt; | |
469 | int early_errors_cnt; | |
470 | int ser_ints_ok_cnt; | |
471 | int errors_cnt; | |
472 | unsigned long int processing_flip; | |
473 | unsigned long processing_flip_still_room; | |
474 | unsigned long int timeout_flush_cnt; | |
475 | int rx_dma_ints; | |
476 | int tx_dma_ints; | |
477 | int rx_tot; | |
478 | int tx_tot; | |
479 | }; | |
480 | ||
481 | static struct ser_statistics_type ser_stat[NR_PORTS]; | |
482 | ||
483 | #else | |
484 | ||
485 | #define PROCSTAT(x) | |
486 | ||
487 | #endif /* CONFIG_ETRAX_SERIAL_PROC_ENTRY */ | |
488 | ||
489 | /* RS-485 */ | |
490 | #if defined(CONFIG_ETRAX_RS485) | |
491 | #ifdef CONFIG_ETRAX_FAST_TIMER | |
492 | static struct fast_timer fast_timers_rs485[NR_PORTS]; | |
493 | #endif | |
494 | #if defined(CONFIG_ETRAX_RS485_ON_PA) | |
495 | static int rs485_pa_bit = CONFIG_ETRAX_RS485_ON_PA_BIT; | |
496 | #endif | |
497 | #if defined(CONFIG_ETRAX_RS485_ON_PORT_G) | |
498 | static int rs485_port_g_bit = CONFIG_ETRAX_RS485_ON_PORT_G_BIT; | |
499 | #endif | |
500 | #endif | |
501 | ||
502 | /* Info and macros needed for each ports extra control/status signals. */ | |
503 | #define E100_STRUCT_PORT(line, pinname) \ | |
504 | ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ | |
505 | (R_PORT_PA_DATA): ( \ | |
506 | (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ | |
507 | (R_PORT_PB_DATA):&dummy_ser[line])) | |
508 | ||
509 | #define E100_STRUCT_SHADOW(line, pinname) \ | |
510 | ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ | |
511 | (&port_pa_data_shadow): ( \ | |
512 | (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ | |
513 | (&port_pb_data_shadow):&dummy_ser[line])) | |
514 | #define E100_STRUCT_MASK(line, pinname) \ | |
515 | ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ | |
516 | (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT): ( \ | |
517 | (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ | |
518 | (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT):DUMMY_##pinname##_MASK)) | |
519 | ||
520 | #define DUMMY_DTR_MASK 1 | |
521 | #define DUMMY_RI_MASK 2 | |
522 | #define DUMMY_DSR_MASK 4 | |
523 | #define DUMMY_CD_MASK 8 | |
524 | static unsigned char dummy_ser[NR_PORTS] = {0xFF, 0xFF, 0xFF,0xFF}; | |
525 | ||
526 | /* If not all status pins are used or disabled, use mixed mode */ | |
527 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 | |
528 | ||
529 | #define SER0_PA_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PA_BIT+CONFIG_ETRAX_SER0_RI_ON_PA_BIT+CONFIG_ETRAX_SER0_DSR_ON_PA_BIT+CONFIG_ETRAX_SER0_CD_ON_PA_BIT) | |
530 | ||
531 | #if SER0_PA_BITSUM != -4 | |
532 | # if CONFIG_ETRAX_SER0_DTR_ON_PA_BIT == -1 | |
533 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED | |
534 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 | |
535 | # endif | |
536 | # endif | |
537 | # if CONFIG_ETRAX_SER0_RI_ON_PA_BIT == -1 | |
538 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED | |
539 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 | |
540 | # endif | |
541 | # endif | |
542 | # if CONFIG_ETRAX_SER0_DSR_ON_PA_BIT == -1 | |
543 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED | |
544 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 | |
545 | # endif | |
546 | # endif | |
547 | # if CONFIG_ETRAX_SER0_CD_ON_PA_BIT == -1 | |
548 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED | |
549 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 | |
550 | # endif | |
551 | # endif | |
552 | #endif | |
553 | ||
554 | #define SER0_PB_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PB_BIT+CONFIG_ETRAX_SER0_RI_ON_PB_BIT+CONFIG_ETRAX_SER0_DSR_ON_PB_BIT+CONFIG_ETRAX_SER0_CD_ON_PB_BIT) | |
555 | ||
556 | #if SER0_PB_BITSUM != -4 | |
557 | # if CONFIG_ETRAX_SER0_DTR_ON_PB_BIT == -1 | |
558 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED | |
559 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 | |
560 | # endif | |
561 | # endif | |
562 | # if CONFIG_ETRAX_SER0_RI_ON_PB_BIT == -1 | |
563 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED | |
564 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 | |
565 | # endif | |
566 | # endif | |
567 | # if CONFIG_ETRAX_SER0_DSR_ON_PB_BIT == -1 | |
568 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED | |
569 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 | |
570 | # endif | |
571 | # endif | |
572 | # if CONFIG_ETRAX_SER0_CD_ON_PB_BIT == -1 | |
573 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED | |
574 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 | |
575 | # endif | |
576 | # endif | |
577 | #endif | |
578 | ||
579 | #endif /* PORT0 */ | |
580 | ||
581 | ||
582 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 | |
583 | ||
584 | #define SER1_PA_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PA_BIT+CONFIG_ETRAX_SER1_RI_ON_PA_BIT+CONFIG_ETRAX_SER1_DSR_ON_PA_BIT+CONFIG_ETRAX_SER1_CD_ON_PA_BIT) | |
585 | ||
586 | #if SER1_PA_BITSUM != -4 | |
587 | # if CONFIG_ETRAX_SER1_DTR_ON_PA_BIT == -1 | |
588 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED | |
589 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 | |
590 | # endif | |
591 | # endif | |
592 | # if CONFIG_ETRAX_SER1_RI_ON_PA_BIT == -1 | |
593 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED | |
594 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 | |
595 | # endif | |
596 | # endif | |
597 | # if CONFIG_ETRAX_SER1_DSR_ON_PA_BIT == -1 | |
598 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED | |
599 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 | |
600 | # endif | |
601 | # endif | |
602 | # if CONFIG_ETRAX_SER1_CD_ON_PA_BIT == -1 | |
603 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED | |
604 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 | |
605 | # endif | |
606 | # endif | |
607 | #endif | |
608 | ||
609 | #define SER1_PB_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PB_BIT+CONFIG_ETRAX_SER1_RI_ON_PB_BIT+CONFIG_ETRAX_SER1_DSR_ON_PB_BIT+CONFIG_ETRAX_SER1_CD_ON_PB_BIT) | |
610 | ||
611 | #if SER1_PB_BITSUM != -4 | |
612 | # if CONFIG_ETRAX_SER1_DTR_ON_PB_BIT == -1 | |
613 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED | |
614 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 | |
615 | # endif | |
616 | # endif | |
617 | # if CONFIG_ETRAX_SER1_RI_ON_PB_BIT == -1 | |
618 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED | |
619 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 | |
620 | # endif | |
621 | # endif | |
622 | # if CONFIG_ETRAX_SER1_DSR_ON_PB_BIT == -1 | |
623 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED | |
624 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 | |
625 | # endif | |
626 | # endif | |
627 | # if CONFIG_ETRAX_SER1_CD_ON_PB_BIT == -1 | |
628 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED | |
629 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 | |
630 | # endif | |
631 | # endif | |
632 | #endif | |
633 | ||
634 | #endif /* PORT1 */ | |
635 | ||
636 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 | |
637 | ||
638 | #define SER2_PA_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PA_BIT+CONFIG_ETRAX_SER2_RI_ON_PA_BIT+CONFIG_ETRAX_SER2_DSR_ON_PA_BIT+CONFIG_ETRAX_SER2_CD_ON_PA_BIT) | |
639 | ||
640 | #if SER2_PA_BITSUM != -4 | |
641 | # if CONFIG_ETRAX_SER2_DTR_ON_PA_BIT == -1 | |
642 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED | |
643 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 | |
644 | # endif | |
645 | # endif | |
646 | # if CONFIG_ETRAX_SER2_RI_ON_PA_BIT == -1 | |
647 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED | |
648 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 | |
649 | # endif | |
650 | # endif | |
651 | # if CONFIG_ETRAX_SER2_DSR_ON_PA_BIT == -1 | |
652 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED | |
653 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 | |
654 | # endif | |
655 | # endif | |
656 | # if CONFIG_ETRAX_SER2_CD_ON_PA_BIT == -1 | |
657 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED | |
658 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 | |
659 | # endif | |
660 | # endif | |
661 | #endif | |
662 | ||
663 | #define SER2_PB_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PB_BIT+CONFIG_ETRAX_SER2_RI_ON_PB_BIT+CONFIG_ETRAX_SER2_DSR_ON_PB_BIT+CONFIG_ETRAX_SER2_CD_ON_PB_BIT) | |
664 | ||
665 | #if SER2_PB_BITSUM != -4 | |
666 | # if CONFIG_ETRAX_SER2_DTR_ON_PB_BIT == -1 | |
667 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED | |
668 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 | |
669 | # endif | |
670 | # endif | |
671 | # if CONFIG_ETRAX_SER2_RI_ON_PB_BIT == -1 | |
672 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED | |
673 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 | |
674 | # endif | |
675 | # endif | |
676 | # if CONFIG_ETRAX_SER2_DSR_ON_PB_BIT == -1 | |
677 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED | |
678 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 | |
679 | # endif | |
680 | # endif | |
681 | # if CONFIG_ETRAX_SER2_CD_ON_PB_BIT == -1 | |
682 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED | |
683 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 | |
684 | # endif | |
685 | # endif | |
686 | #endif | |
687 | ||
688 | #endif /* PORT2 */ | |
689 | ||
690 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 | |
691 | ||
692 | #define SER3_PA_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PA_BIT+CONFIG_ETRAX_SER3_RI_ON_PA_BIT+CONFIG_ETRAX_SER3_DSR_ON_PA_BIT+CONFIG_ETRAX_SER3_CD_ON_PA_BIT) | |
693 | ||
694 | #if SER3_PA_BITSUM != -4 | |
695 | # if CONFIG_ETRAX_SER3_DTR_ON_PA_BIT == -1 | |
696 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED | |
697 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 | |
698 | # endif | |
699 | # endif | |
700 | # if CONFIG_ETRAX_SER3_RI_ON_PA_BIT == -1 | |
701 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED | |
702 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 | |
703 | # endif | |
704 | # endif | |
705 | # if CONFIG_ETRAX_SER3_DSR_ON_PA_BIT == -1 | |
706 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED | |
707 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 | |
708 | # endif | |
709 | # endif | |
710 | # if CONFIG_ETRAX_SER3_CD_ON_PA_BIT == -1 | |
711 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED | |
712 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 | |
713 | # endif | |
714 | # endif | |
715 | #endif | |
716 | ||
717 | #define SER3_PB_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PB_BIT+CONFIG_ETRAX_SER3_RI_ON_PB_BIT+CONFIG_ETRAX_SER3_DSR_ON_PB_BIT+CONFIG_ETRAX_SER3_CD_ON_PB_BIT) | |
718 | ||
719 | #if SER3_PB_BITSUM != -4 | |
720 | # if CONFIG_ETRAX_SER3_DTR_ON_PB_BIT == -1 | |
721 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED | |
722 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 | |
723 | # endif | |
724 | # endif | |
725 | # if CONFIG_ETRAX_SER3_RI_ON_PB_BIT == -1 | |
726 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED | |
727 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 | |
728 | # endif | |
729 | # endif | |
730 | # if CONFIG_ETRAX_SER3_DSR_ON_PB_BIT == -1 | |
731 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED | |
732 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 | |
733 | # endif | |
734 | # endif | |
735 | # if CONFIG_ETRAX_SER3_CD_ON_PB_BIT == -1 | |
736 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED | |
737 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 | |
738 | # endif | |
739 | # endif | |
740 | #endif | |
741 | ||
742 | #endif /* PORT3 */ | |
743 | ||
744 | ||
745 | #if defined(CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED) || \ | |
746 | defined(CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED) || \ | |
747 | defined(CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED) || \ | |
748 | defined(CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED) | |
749 | #define CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED | |
750 | #endif | |
751 | ||
752 | #ifdef CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED | |
753 | /* The pins can be mixed on PA and PB */ | |
754 | #define CONTROL_PINS_PORT_NOT_USED(line) \ | |
755 | &dummy_ser[line], &dummy_ser[line], \ | |
756 | &dummy_ser[line], &dummy_ser[line], \ | |
757 | &dummy_ser[line], &dummy_ser[line], \ | |
758 | &dummy_ser[line], &dummy_ser[line], \ | |
759 | DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK | |
760 | ||
761 | ||
762 | struct control_pins | |
763 | { | |
764 | volatile unsigned char *dtr_port; | |
765 | unsigned char *dtr_shadow; | |
766 | volatile unsigned char *ri_port; | |
767 | unsigned char *ri_shadow; | |
768 | volatile unsigned char *dsr_port; | |
769 | unsigned char *dsr_shadow; | |
770 | volatile unsigned char *cd_port; | |
771 | unsigned char *cd_shadow; | |
772 | ||
773 | unsigned char dtr_mask; | |
774 | unsigned char ri_mask; | |
775 | unsigned char dsr_mask; | |
776 | unsigned char cd_mask; | |
777 | }; | |
778 | ||
779 | static const struct control_pins e100_modem_pins[NR_PORTS] = | |
780 | { | |
781 | /* Ser 0 */ | |
782 | { | |
783 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 | |
784 | E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR), | |
785 | E100_STRUCT_PORT(0,RI), E100_STRUCT_SHADOW(0,RI), | |
786 | E100_STRUCT_PORT(0,DSR), E100_STRUCT_SHADOW(0,DSR), | |
787 | E100_STRUCT_PORT(0,CD), E100_STRUCT_SHADOW(0,CD), | |
788 | E100_STRUCT_MASK(0,DTR), | |
789 | E100_STRUCT_MASK(0,RI), | |
790 | E100_STRUCT_MASK(0,DSR), | |
791 | E100_STRUCT_MASK(0,CD) | |
792 | #else | |
793 | CONTROL_PINS_PORT_NOT_USED(0) | |
794 | #endif | |
795 | }, | |
796 | ||
797 | /* Ser 1 */ | |
798 | { | |
799 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 | |
800 | E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR), | |
801 | E100_STRUCT_PORT(1,RI), E100_STRUCT_SHADOW(1,RI), | |
802 | E100_STRUCT_PORT(1,DSR), E100_STRUCT_SHADOW(1,DSR), | |
803 | E100_STRUCT_PORT(1,CD), E100_STRUCT_SHADOW(1,CD), | |
804 | E100_STRUCT_MASK(1,DTR), | |
805 | E100_STRUCT_MASK(1,RI), | |
806 | E100_STRUCT_MASK(1,DSR), | |
807 | E100_STRUCT_MASK(1,CD) | |
808 | #else | |
809 | CONTROL_PINS_PORT_NOT_USED(1) | |
810 | #endif | |
811 | }, | |
812 | ||
813 | /* Ser 2 */ | |
814 | { | |
815 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 | |
816 | E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR), | |
817 | E100_STRUCT_PORT(2,RI), E100_STRUCT_SHADOW(2,RI), | |
818 | E100_STRUCT_PORT(2,DSR), E100_STRUCT_SHADOW(2,DSR), | |
819 | E100_STRUCT_PORT(2,CD), E100_STRUCT_SHADOW(2,CD), | |
820 | E100_STRUCT_MASK(2,DTR), | |
821 | E100_STRUCT_MASK(2,RI), | |
822 | E100_STRUCT_MASK(2,DSR), | |
823 | E100_STRUCT_MASK(2,CD) | |
824 | #else | |
825 | CONTROL_PINS_PORT_NOT_USED(2) | |
826 | #endif | |
827 | }, | |
828 | ||
829 | /* Ser 3 */ | |
830 | { | |
831 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 | |
832 | E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR), | |
833 | E100_STRUCT_PORT(3,RI), E100_STRUCT_SHADOW(3,RI), | |
834 | E100_STRUCT_PORT(3,DSR), E100_STRUCT_SHADOW(3,DSR), | |
835 | E100_STRUCT_PORT(3,CD), E100_STRUCT_SHADOW(3,CD), | |
836 | E100_STRUCT_MASK(3,DTR), | |
837 | E100_STRUCT_MASK(3,RI), | |
838 | E100_STRUCT_MASK(3,DSR), | |
839 | E100_STRUCT_MASK(3,CD) | |
840 | #else | |
841 | CONTROL_PINS_PORT_NOT_USED(3) | |
842 | #endif | |
843 | } | |
844 | }; | |
845 | #else /* CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */ | |
846 | ||
847 | /* All pins are on either PA or PB for each serial port */ | |
848 | #define CONTROL_PINS_PORT_NOT_USED(line) \ | |
849 | &dummy_ser[line], &dummy_ser[line], \ | |
850 | DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK | |
851 | ||
852 | ||
853 | struct control_pins | |
854 | { | |
855 | volatile unsigned char *port; | |
856 | unsigned char *shadow; | |
857 | ||
858 | unsigned char dtr_mask; | |
859 | unsigned char ri_mask; | |
860 | unsigned char dsr_mask; | |
861 | unsigned char cd_mask; | |
862 | }; | |
863 | ||
864 | #define dtr_port port | |
865 | #define dtr_shadow shadow | |
866 | #define ri_port port | |
867 | #define ri_shadow shadow | |
868 | #define dsr_port port | |
869 | #define dsr_shadow shadow | |
870 | #define cd_port port | |
871 | #define cd_shadow shadow | |
872 | ||
873 | static const struct control_pins e100_modem_pins[NR_PORTS] = | |
874 | { | |
875 | /* Ser 0 */ | |
876 | { | |
877 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 | |
878 | E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR), | |
879 | E100_STRUCT_MASK(0,DTR), | |
880 | E100_STRUCT_MASK(0,RI), | |
881 | E100_STRUCT_MASK(0,DSR), | |
882 | E100_STRUCT_MASK(0,CD) | |
883 | #else | |
884 | CONTROL_PINS_PORT_NOT_USED(0) | |
885 | #endif | |
886 | }, | |
887 | ||
888 | /* Ser 1 */ | |
889 | { | |
890 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 | |
891 | E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR), | |
892 | E100_STRUCT_MASK(1,DTR), | |
893 | E100_STRUCT_MASK(1,RI), | |
894 | E100_STRUCT_MASK(1,DSR), | |
895 | E100_STRUCT_MASK(1,CD) | |
896 | #else | |
897 | CONTROL_PINS_PORT_NOT_USED(1) | |
898 | #endif | |
899 | }, | |
900 | ||
901 | /* Ser 2 */ | |
902 | { | |
903 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 | |
904 | E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR), | |
905 | E100_STRUCT_MASK(2,DTR), | |
906 | E100_STRUCT_MASK(2,RI), | |
907 | E100_STRUCT_MASK(2,DSR), | |
908 | E100_STRUCT_MASK(2,CD) | |
909 | #else | |
910 | CONTROL_PINS_PORT_NOT_USED(2) | |
911 | #endif | |
912 | }, | |
913 | ||
914 | /* Ser 3 */ | |
915 | { | |
916 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 | |
917 | E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR), | |
918 | E100_STRUCT_MASK(3,DTR), | |
919 | E100_STRUCT_MASK(3,RI), | |
920 | E100_STRUCT_MASK(3,DSR), | |
921 | E100_STRUCT_MASK(3,CD) | |
922 | #else | |
923 | CONTROL_PINS_PORT_NOT_USED(3) | |
924 | #endif | |
925 | } | |
926 | }; | |
927 | #endif /* !CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */ | |
928 | ||
929 | #define E100_RTS_MASK 0x20 | |
930 | #define E100_CTS_MASK 0x40 | |
931 | ||
932 | /* All serial port signals are active low: | |
933 | * active = 0 -> 3.3V to RS-232 driver -> -12V on RS-232 level | |
934 | * inactive = 1 -> 0V to RS-232 driver -> +12V on RS-232 level | |
935 | * | |
936 | * These macros returns the pin value: 0=0V, >=1 = 3.3V on ETRAX chip | |
937 | */ | |
938 | ||
939 | /* Output */ | |
940 | #define E100_RTS_GET(info) ((info)->rx_ctrl & E100_RTS_MASK) | |
941 | /* Input */ | |
d7283353 | 942 | #define E100_CTS_GET(info) ((info)->ioport[REG_STATUS] & E100_CTS_MASK) |
1da177e4 LT |
943 | |
944 | /* These are typically PA or PB and 0 means 0V, 1 means 3.3V */ | |
945 | /* Is an output */ | |
946 | #define E100_DTR_GET(info) ((*e100_modem_pins[(info)->line].dtr_shadow) & e100_modem_pins[(info)->line].dtr_mask) | |
947 | ||
948 | /* Normally inputs */ | |
949 | #define E100_RI_GET(info) ((*e100_modem_pins[(info)->line].ri_port) & e100_modem_pins[(info)->line].ri_mask) | |
950 | #define E100_CD_GET(info) ((*e100_modem_pins[(info)->line].cd_port) & e100_modem_pins[(info)->line].cd_mask) | |
951 | ||
952 | /* Input */ | |
953 | #define E100_DSR_GET(info) ((*e100_modem_pins[(info)->line].dsr_port) & e100_modem_pins[(info)->line].dsr_mask) | |
954 | ||
955 | ||
956 | /* | |
957 | * tmp_buf is used as a temporary buffer by serial_write. We need to | |
958 | * lock it in case the memcpy_fromfs blocks while swapping in a page, | |
959 | * and some other program tries to do a serial write at the same time. | |
960 | * Since the lock will only come under contention when the system is | |
961 | * swapping and available memory is low, it makes sense to share one | |
962 | * buffer across all the serial ports, since it significantly saves | |
963 | * memory if large numbers of serial ports are open. | |
964 | */ | |
965 | static unsigned char *tmp_buf; | |
f392ecfa | 966 | static DEFINE_MUTEX(tmp_buf_mutex); |
1da177e4 LT |
967 | |
968 | /* Calculate the chartime depending on baudrate, numbor of bits etc. */ | |
969 | static void update_char_time(struct e100_serial * info) | |
970 | { | |
a88487c7 | 971 | tcflag_t cflags = info->port.tty->termios->c_cflag; |
1da177e4 LT |
972 | int bits; |
973 | ||
974 | /* calc. number of bits / data byte */ | |
975 | /* databits + startbit and 1 stopbit */ | |
976 | if ((cflags & CSIZE) == CS7) | |
977 | bits = 9; | |
978 | else | |
979 | bits = 10; | |
980 | ||
981 | if (cflags & CSTOPB) /* 2 stopbits ? */ | |
982 | bits++; | |
983 | ||
984 | if (cflags & PARENB) /* parity bit ? */ | |
985 | bits++; | |
986 | ||
987 | /* calc timeout */ | |
988 | info->char_time_usec = ((bits * 1000000) / info->baud) + 1; | |
989 | info->flush_time_usec = 4*info->char_time_usec; | |
990 | if (info->flush_time_usec < MIN_FLUSH_TIME_USEC) | |
991 | info->flush_time_usec = MIN_FLUSH_TIME_USEC; | |
992 | ||
993 | } | |
994 | ||
995 | /* | |
996 | * This function maps from the Bxxxx defines in asm/termbits.h into real | |
997 | * baud rates. | |
998 | */ | |
999 | ||
1000 | static int | |
1001 | cflag_to_baud(unsigned int cflag) | |
1002 | { | |
1003 | static int baud_table[] = { | |
1004 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, | |
1005 | 4800, 9600, 19200, 38400 }; | |
1006 | ||
1007 | static int ext_baud_table[] = { | |
1008 | 0, 57600, 115200, 230400, 460800, 921600, 1843200, 6250000, | |
1009 | 0, 0, 0, 0, 0, 0, 0, 0 }; | |
1010 | ||
1011 | if (cflag & CBAUDEX) | |
1012 | return ext_baud_table[(cflag & CBAUD) & ~CBAUDEX]; | |
1013 | else | |
1014 | return baud_table[cflag & CBAUD]; | |
1015 | } | |
1016 | ||
1017 | /* and this maps to an etrax100 hardware baud constant */ | |
1018 | ||
1019 | static unsigned char | |
1020 | cflag_to_etrax_baud(unsigned int cflag) | |
1021 | { | |
1022 | char retval; | |
1023 | ||
1024 | static char baud_table[] = { | |
1025 | -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, 3, 4, 5, 6, 7 }; | |
1026 | ||
1027 | static char ext_baud_table[] = { | |
1028 | -1, 8, 9, 10, 11, 12, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1 }; | |
1029 | ||
1030 | if (cflag & CBAUDEX) | |
1031 | retval = ext_baud_table[(cflag & CBAUD) & ~CBAUDEX]; | |
1032 | else | |
1033 | retval = baud_table[cflag & CBAUD]; | |
1034 | ||
1035 | if (retval < 0) { | |
1036 | printk(KERN_WARNING "serdriver tried setting invalid baud rate, flags %x.\n", cflag); | |
1037 | retval = 5; /* choose default 9600 instead */ | |
1038 | } | |
1039 | ||
1040 | return retval | (retval << 4); /* choose same for both TX and RX */ | |
1041 | } | |
1042 | ||
1043 | ||
1044 | /* Various static support functions */ | |
1045 | ||
1046 | /* Functions to set or clear DTR/RTS on the requested line */ | |
1047 | /* It is complicated by the fact that RTS is a serial port register, while | |
1048 | * DTR might not be implemented in the HW at all, and if it is, it can be on | |
1049 | * any general port. | |
1050 | */ | |
1051 | ||
1052 | ||
1053 | static inline void | |
1054 | e100_dtr(struct e100_serial *info, int set) | |
1055 | { | |
1056 | #ifndef CONFIG_SVINTO_SIM | |
1057 | unsigned char mask = e100_modem_pins[info->line].dtr_mask; | |
1058 | ||
1059 | #ifdef SERIAL_DEBUG_IO | |
1060 | printk("ser%i dtr %i mask: 0x%02X\n", info->line, set, mask); | |
1061 | printk("ser%i shadow before 0x%02X get: %i\n", | |
1062 | info->line, *e100_modem_pins[info->line].dtr_shadow, | |
1063 | E100_DTR_GET(info)); | |
1064 | #endif | |
1065 | /* DTR is active low */ | |
1066 | { | |
1067 | unsigned long flags; | |
1068 | ||
77accbf5 | 1069 | local_irq_save(flags); |
1da177e4 LT |
1070 | *e100_modem_pins[info->line].dtr_shadow &= ~mask; |
1071 | *e100_modem_pins[info->line].dtr_shadow |= (set ? 0 : mask); | |
1072 | *e100_modem_pins[info->line].dtr_port = *e100_modem_pins[info->line].dtr_shadow; | |
77accbf5 | 1073 | local_irq_restore(flags); |
1da177e4 LT |
1074 | } |
1075 | ||
1076 | #ifdef SERIAL_DEBUG_IO | |
1077 | printk("ser%i shadow after 0x%02X get: %i\n", | |
1078 | info->line, *e100_modem_pins[info->line].dtr_shadow, | |
1079 | E100_DTR_GET(info)); | |
1080 | #endif | |
1081 | #endif | |
1082 | } | |
1083 | ||
1084 | /* set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive | |
1085 | * 0=0V , 1=3.3V | |
1086 | */ | |
1087 | static inline void | |
1088 | e100_rts(struct e100_serial *info, int set) | |
1089 | { | |
1090 | #ifndef CONFIG_SVINTO_SIM | |
1091 | unsigned long flags; | |
77accbf5 | 1092 | local_irq_save(flags); |
1da177e4 LT |
1093 | info->rx_ctrl &= ~E100_RTS_MASK; |
1094 | info->rx_ctrl |= (set ? 0 : E100_RTS_MASK); /* RTS is active low */ | |
d7283353 | 1095 | info->ioport[REG_REC_CTRL] = info->rx_ctrl; |
77accbf5 | 1096 | local_irq_restore(flags); |
1da177e4 LT |
1097 | #ifdef SERIAL_DEBUG_IO |
1098 | printk("ser%i rts %i\n", info->line, set); | |
1099 | #endif | |
1100 | #endif | |
1101 | } | |
1102 | ||
1103 | ||
1104 | /* If this behaves as a modem, RI and CD is an output */ | |
1105 | static inline void | |
1106 | e100_ri_out(struct e100_serial *info, int set) | |
1107 | { | |
1108 | #ifndef CONFIG_SVINTO_SIM | |
1109 | /* RI is active low */ | |
1110 | { | |
1111 | unsigned char mask = e100_modem_pins[info->line].ri_mask; | |
1112 | unsigned long flags; | |
1113 | ||
77accbf5 | 1114 | local_irq_save(flags); |
1da177e4 LT |
1115 | *e100_modem_pins[info->line].ri_shadow &= ~mask; |
1116 | *e100_modem_pins[info->line].ri_shadow |= (set ? 0 : mask); | |
1117 | *e100_modem_pins[info->line].ri_port = *e100_modem_pins[info->line].ri_shadow; | |
77accbf5 | 1118 | local_irq_restore(flags); |
1da177e4 LT |
1119 | } |
1120 | #endif | |
1121 | } | |
1122 | static inline void | |
1123 | e100_cd_out(struct e100_serial *info, int set) | |
1124 | { | |
1125 | #ifndef CONFIG_SVINTO_SIM | |
1126 | /* CD is active low */ | |
1127 | { | |
1128 | unsigned char mask = e100_modem_pins[info->line].cd_mask; | |
1129 | unsigned long flags; | |
1130 | ||
77accbf5 | 1131 | local_irq_save(flags); |
1da177e4 LT |
1132 | *e100_modem_pins[info->line].cd_shadow &= ~mask; |
1133 | *e100_modem_pins[info->line].cd_shadow |= (set ? 0 : mask); | |
1134 | *e100_modem_pins[info->line].cd_port = *e100_modem_pins[info->line].cd_shadow; | |
77accbf5 | 1135 | local_irq_restore(flags); |
1da177e4 LT |
1136 | } |
1137 | #endif | |
1138 | } | |
1139 | ||
1140 | static inline void | |
1141 | e100_disable_rx(struct e100_serial *info) | |
1142 | { | |
1143 | #ifndef CONFIG_SVINTO_SIM | |
1144 | /* disable the receiver */ | |
d7283353 | 1145 | info->ioport[REG_REC_CTRL] = |
1da177e4 LT |
1146 | (info->rx_ctrl &= ~IO_MASK(R_SERIAL0_REC_CTRL, rec_enable)); |
1147 | #endif | |
1148 | } | |
1149 | ||
1150 | static inline void | |
1151 | e100_enable_rx(struct e100_serial *info) | |
1152 | { | |
1153 | #ifndef CONFIG_SVINTO_SIM | |
1154 | /* enable the receiver */ | |
d7283353 | 1155 | info->ioport[REG_REC_CTRL] = |
1da177e4 LT |
1156 | (info->rx_ctrl |= IO_MASK(R_SERIAL0_REC_CTRL, rec_enable)); |
1157 | #endif | |
1158 | } | |
1159 | ||
1160 | /* the rx DMA uses both the dma_descr and the dma_eop interrupts */ | |
1161 | ||
1162 | static inline void | |
1163 | e100_disable_rxdma_irq(struct e100_serial *info) | |
1164 | { | |
1165 | #ifdef SERIAL_DEBUG_INTR | |
1166 | printk("rxdma_irq(%d): 0\n",info->line); | |
1167 | #endif | |
1168 | DINTR1(DEBUG_LOG(info->line,"IRQ disable_rxdma_irq %i\n", info->line)); | |
1169 | *R_IRQ_MASK2_CLR = (info->irq << 2) | (info->irq << 3); | |
1170 | } | |
1171 | ||
1172 | static inline void | |
1173 | e100_enable_rxdma_irq(struct e100_serial *info) | |
1174 | { | |
1175 | #ifdef SERIAL_DEBUG_INTR | |
1176 | printk("rxdma_irq(%d): 1\n",info->line); | |
1177 | #endif | |
1178 | DINTR1(DEBUG_LOG(info->line,"IRQ enable_rxdma_irq %i\n", info->line)); | |
1179 | *R_IRQ_MASK2_SET = (info->irq << 2) | (info->irq << 3); | |
1180 | } | |
1181 | ||
1182 | /* the tx DMA uses only dma_descr interrupt */ | |
1183 | ||
41c28ff1 | 1184 | static void e100_disable_txdma_irq(struct e100_serial *info) |
1da177e4 LT |
1185 | { |
1186 | #ifdef SERIAL_DEBUG_INTR | |
1187 | printk("txdma_irq(%d): 0\n",info->line); | |
1188 | #endif | |
1189 | DINTR1(DEBUG_LOG(info->line,"IRQ disable_txdma_irq %i\n", info->line)); | |
1190 | *R_IRQ_MASK2_CLR = info->irq; | |
1191 | } | |
1192 | ||
41c28ff1 | 1193 | static void e100_enable_txdma_irq(struct e100_serial *info) |
1da177e4 LT |
1194 | { |
1195 | #ifdef SERIAL_DEBUG_INTR | |
1196 | printk("txdma_irq(%d): 1\n",info->line); | |
1197 | #endif | |
1198 | DINTR1(DEBUG_LOG(info->line,"IRQ enable_txdma_irq %i\n", info->line)); | |
1199 | *R_IRQ_MASK2_SET = info->irq; | |
1200 | } | |
1201 | ||
41c28ff1 | 1202 | static void e100_disable_txdma_channel(struct e100_serial *info) |
1da177e4 LT |
1203 | { |
1204 | unsigned long flags; | |
1205 | ||
1206 | /* Disable output DMA channel for the serial port in question | |
1207 | * ( set to something other then serialX) | |
1208 | */ | |
77accbf5 | 1209 | local_irq_save(flags); |
1da177e4 LT |
1210 | DFLOW(DEBUG_LOG(info->line, "disable_txdma_channel %i\n", info->line)); |
1211 | if (info->line == 0) { | |
1212 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma6)) == | |
1213 | IO_STATE(R_GEN_CONFIG, dma6, serial0)) { | |
1214 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6); | |
1215 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused); | |
1216 | } | |
1217 | } else if (info->line == 1) { | |
1218 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma8)) == | |
1219 | IO_STATE(R_GEN_CONFIG, dma8, serial1)) { | |
1220 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8); | |
1221 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb); | |
1222 | } | |
1223 | } else if (info->line == 2) { | |
1224 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma2)) == | |
1225 | IO_STATE(R_GEN_CONFIG, dma2, serial2)) { | |
1226 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2); | |
1227 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0); | |
1228 | } | |
1229 | } else if (info->line == 3) { | |
1230 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma4)) == | |
1231 | IO_STATE(R_GEN_CONFIG, dma4, serial3)) { | |
1232 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4); | |
1233 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1); | |
1234 | } | |
1235 | } | |
1236 | *R_GEN_CONFIG = genconfig_shadow; | |
77accbf5 | 1237 | local_irq_restore(flags); |
1da177e4 LT |
1238 | } |
1239 | ||
1240 | ||
41c28ff1 | 1241 | static void e100_enable_txdma_channel(struct e100_serial *info) |
1da177e4 LT |
1242 | { |
1243 | unsigned long flags; | |
1244 | ||
77accbf5 | 1245 | local_irq_save(flags); |
1da177e4 LT |
1246 | DFLOW(DEBUG_LOG(info->line, "enable_txdma_channel %i\n", info->line)); |
1247 | /* Enable output DMA channel for the serial port in question */ | |
1248 | if (info->line == 0) { | |
1249 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6); | |
1250 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, serial0); | |
1251 | } else if (info->line == 1) { | |
1252 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8); | |
1253 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, serial1); | |
1254 | } else if (info->line == 2) { | |
1255 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2); | |
1256 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, serial2); | |
1257 | } else if (info->line == 3) { | |
1258 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4); | |
1259 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, serial3); | |
1260 | } | |
1261 | *R_GEN_CONFIG = genconfig_shadow; | |
77accbf5 | 1262 | local_irq_restore(flags); |
1da177e4 LT |
1263 | } |
1264 | ||
41c28ff1 | 1265 | static void e100_disable_rxdma_channel(struct e100_serial *info) |
1da177e4 LT |
1266 | { |
1267 | unsigned long flags; | |
1268 | ||
1269 | /* Disable input DMA channel for the serial port in question | |
1270 | * ( set to something other then serialX) | |
1271 | */ | |
77accbf5 | 1272 | local_irq_save(flags); |
1da177e4 LT |
1273 | if (info->line == 0) { |
1274 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma7)) == | |
1275 | IO_STATE(R_GEN_CONFIG, dma7, serial0)) { | |
1276 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7); | |
1277 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, unused); | |
1278 | } | |
1279 | } else if (info->line == 1) { | |
1280 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma9)) == | |
1281 | IO_STATE(R_GEN_CONFIG, dma9, serial1)) { | |
1282 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9); | |
1283 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, usb); | |
1284 | } | |
1285 | } else if (info->line == 2) { | |
1286 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma3)) == | |
1287 | IO_STATE(R_GEN_CONFIG, dma3, serial2)) { | |
1288 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3); | |
1289 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0); | |
1290 | } | |
1291 | } else if (info->line == 3) { | |
1292 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma5)) == | |
1293 | IO_STATE(R_GEN_CONFIG, dma5, serial3)) { | |
1294 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5); | |
1295 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1); | |
1296 | } | |
1297 | } | |
1298 | *R_GEN_CONFIG = genconfig_shadow; | |
77accbf5 | 1299 | local_irq_restore(flags); |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | ||
41c28ff1 | 1303 | static void e100_enable_rxdma_channel(struct e100_serial *info) |
1da177e4 LT |
1304 | { |
1305 | unsigned long flags; | |
1306 | ||
77accbf5 | 1307 | local_irq_save(flags); |
1da177e4 LT |
1308 | /* Enable input DMA channel for the serial port in question */ |
1309 | if (info->line == 0) { | |
1310 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7); | |
1311 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, serial0); | |
1312 | } else if (info->line == 1) { | |
1313 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9); | |
1314 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, serial1); | |
1315 | } else if (info->line == 2) { | |
1316 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3); | |
1317 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, serial2); | |
1318 | } else if (info->line == 3) { | |
1319 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5); | |
1320 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, serial3); | |
1321 | } | |
1322 | *R_GEN_CONFIG = genconfig_shadow; | |
77accbf5 | 1323 | local_irq_restore(flags); |
1da177e4 LT |
1324 | } |
1325 | ||
1326 | #ifdef SERIAL_HANDLE_EARLY_ERRORS | |
1327 | /* in order to detect and fix errors on the first byte | |
1328 | we have to use the serial interrupts as well. */ | |
1329 | ||
1330 | static inline void | |
1331 | e100_disable_serial_data_irq(struct e100_serial *info) | |
1332 | { | |
1333 | #ifdef SERIAL_DEBUG_INTR | |
1334 | printk("ser_irq(%d): 0\n",info->line); | |
1335 | #endif | |
1336 | DINTR1(DEBUG_LOG(info->line,"IRQ disable data_irq %i\n", info->line)); | |
1337 | *R_IRQ_MASK1_CLR = (1U << (8+2*info->line)); | |
1338 | } | |
1339 | ||
1340 | static inline void | |
1341 | e100_enable_serial_data_irq(struct e100_serial *info) | |
1342 | { | |
1343 | #ifdef SERIAL_DEBUG_INTR | |
1344 | printk("ser_irq(%d): 1\n",info->line); | |
1345 | printk("**** %d = %d\n", | |
1346 | (8+2*info->line), | |
1347 | (1U << (8+2*info->line))); | |
1348 | #endif | |
1349 | DINTR1(DEBUG_LOG(info->line,"IRQ enable data_irq %i\n", info->line)); | |
1350 | *R_IRQ_MASK1_SET = (1U << (8+2*info->line)); | |
1351 | } | |
1352 | #endif | |
1353 | ||
1354 | static inline void | |
1355 | e100_disable_serial_tx_ready_irq(struct e100_serial *info) | |
1356 | { | |
1357 | #ifdef SERIAL_DEBUG_INTR | |
1358 | printk("ser_tx_irq(%d): 0\n",info->line); | |
1359 | #endif | |
1360 | DINTR1(DEBUG_LOG(info->line,"IRQ disable ready_irq %i\n", info->line)); | |
1361 | *R_IRQ_MASK1_CLR = (1U << (8+1+2*info->line)); | |
1362 | } | |
1363 | ||
1364 | static inline void | |
1365 | e100_enable_serial_tx_ready_irq(struct e100_serial *info) | |
1366 | { | |
1367 | #ifdef SERIAL_DEBUG_INTR | |
1368 | printk("ser_tx_irq(%d): 1\n",info->line); | |
1369 | printk("**** %d = %d\n", | |
1370 | (8+1+2*info->line), | |
1371 | (1U << (8+1+2*info->line))); | |
1372 | #endif | |
1373 | DINTR2(DEBUG_LOG(info->line,"IRQ enable ready_irq %i\n", info->line)); | |
1374 | *R_IRQ_MASK1_SET = (1U << (8+1+2*info->line)); | |
1375 | } | |
1376 | ||
1377 | static inline void e100_enable_rx_irq(struct e100_serial *info) | |
1378 | { | |
1379 | if (info->uses_dma_in) | |
1380 | e100_enable_rxdma_irq(info); | |
1381 | else | |
1382 | e100_enable_serial_data_irq(info); | |
1383 | } | |
1384 | static inline void e100_disable_rx_irq(struct e100_serial *info) | |
1385 | { | |
1386 | if (info->uses_dma_in) | |
1387 | e100_disable_rxdma_irq(info); | |
1388 | else | |
1389 | e100_disable_serial_data_irq(info); | |
1390 | } | |
1391 | ||
1392 | #if defined(CONFIG_ETRAX_RS485) | |
1393 | /* Enable RS-485 mode on selected port. This is UGLY. */ | |
1394 | static int | |
1395 | e100_enable_rs485(struct tty_struct *tty,struct rs485_control *r) | |
1396 | { | |
1397 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; | |
1398 | ||
1399 | #if defined(CONFIG_ETRAX_RS485_ON_PA) | |
1400 | *R_PORT_PA_DATA = port_pa_data_shadow |= (1 << rs485_pa_bit); | |
1401 | #endif | |
1402 | #if defined(CONFIG_ETRAX_RS485_ON_PORT_G) | |
1403 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, | |
1404 | rs485_port_g_bit, 1); | |
1405 | #endif | |
1406 | #if defined(CONFIG_ETRAX_RS485_LTC1387) | |
1407 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, | |
1408 | CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 1); | |
1409 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, | |
1410 | CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 1); | |
1411 | #endif | |
1412 | ||
1413 | info->rs485.rts_on_send = 0x01 & r->rts_on_send; | |
1414 | info->rs485.rts_after_sent = 0x01 & r->rts_after_sent; | |
1415 | if (r->delay_rts_before_send >= 1000) | |
1416 | info->rs485.delay_rts_before_send = 1000; | |
1417 | else | |
1418 | info->rs485.delay_rts_before_send = r->delay_rts_before_send; | |
1419 | info->rs485.enabled = r->enabled; | |
1420 | /* printk("rts: on send = %i, after = %i, enabled = %i", | |
1421 | info->rs485.rts_on_send, | |
1422 | info->rs485.rts_after_sent, | |
1423 | info->rs485.enabled | |
1424 | ); | |
1425 | */ | |
1426 | return 0; | |
1427 | } | |
1428 | ||
1429 | static int | |
77accbf5 | 1430 | e100_write_rs485(struct tty_struct *tty, |
1da177e4 LT |
1431 | const unsigned char *buf, int count) |
1432 | { | |
1433 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; | |
1434 | int old_enabled = info->rs485.enabled; | |
1435 | ||
1436 | /* rs485 is always implicitly enabled if we're using the ioctl() | |
1437 | * but it doesn't have to be set in the rs485_control | |
1438 | * (to be backward compatible with old apps) | |
1439 | * So we store, set and restore it. | |
1440 | */ | |
1441 | info->rs485.enabled = 1; | |
1442 | /* rs_write now deals with RS485 if enabled */ | |
77accbf5 | 1443 | count = rs_write(tty, buf, count); |
1da177e4 LT |
1444 | info->rs485.enabled = old_enabled; |
1445 | return count; | |
1446 | } | |
1447 | ||
1448 | #ifdef CONFIG_ETRAX_FAST_TIMER | |
1449 | /* Timer function to toggle RTS when using FAST_TIMER */ | |
1450 | static void rs485_toggle_rts_timer_function(unsigned long data) | |
1451 | { | |
1452 | struct e100_serial *info = (struct e100_serial *)data; | |
1453 | ||
1454 | fast_timers_rs485[info->line].function = NULL; | |
1455 | e100_rts(info, info->rs485.rts_after_sent); | |
1456 | #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) | |
1457 | e100_enable_rx(info); | |
1458 | e100_enable_rx_irq(info); | |
1459 | #endif | |
1460 | } | |
1461 | #endif | |
1462 | #endif /* CONFIG_ETRAX_RS485 */ | |
1463 | ||
1464 | /* | |
1465 | * ------------------------------------------------------------ | |
1466 | * rs_stop() and rs_start() | |
1467 | * | |
1468 | * This routines are called before setting or resetting tty->stopped. | |
1469 | * They enable or disable transmitter using the XOFF registers, as necessary. | |
1470 | * ------------------------------------------------------------ | |
1471 | */ | |
1472 | ||
1473 | static void | |
1474 | rs_stop(struct tty_struct *tty) | |
1475 | { | |
1476 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
1477 | if (info) { | |
1478 | unsigned long flags; | |
1479 | unsigned long xoff; | |
1480 | ||
77accbf5 | 1481 | local_irq_save(flags); |
1da177e4 LT |
1482 | DFLOW(DEBUG_LOG(info->line, "XOFF rs_stop xmit %i\n", |
1483 | CIRC_CNT(info->xmit.head, | |
1484 | info->xmit.tail,SERIAL_XMIT_SIZE))); | |
1485 | ||
a88487c7 TI |
1486 | xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, |
1487 | STOP_CHAR(info->port.tty)); | |
1da177e4 LT |
1488 | xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, stop); |
1489 | if (tty->termios->c_iflag & IXON ) { | |
1490 | xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); | |
1491 | } | |
1492 | ||
d7283353 | 1493 | *((unsigned long *)&info->ioport[REG_XOFF]) = xoff; |
77accbf5 | 1494 | local_irq_restore(flags); |
1da177e4 LT |
1495 | } |
1496 | } | |
1497 | ||
1498 | static void | |
1499 | rs_start(struct tty_struct *tty) | |
1500 | { | |
1501 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
1502 | if (info) { | |
1503 | unsigned long flags; | |
1504 | unsigned long xoff; | |
1505 | ||
77accbf5 | 1506 | local_irq_save(flags); |
1da177e4 LT |
1507 | DFLOW(DEBUG_LOG(info->line, "XOFF rs_start xmit %i\n", |
1508 | CIRC_CNT(info->xmit.head, | |
1509 | info->xmit.tail,SERIAL_XMIT_SIZE))); | |
1510 | xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(tty)); | |
1511 | xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable); | |
1512 | if (tty->termios->c_iflag & IXON ) { | |
1513 | xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); | |
1514 | } | |
1515 | ||
d7283353 | 1516 | *((unsigned long *)&info->ioport[REG_XOFF]) = xoff; |
1da177e4 LT |
1517 | if (!info->uses_dma_out && |
1518 | info->xmit.head != info->xmit.tail && info->xmit.buf) | |
1519 | e100_enable_serial_tx_ready_irq(info); | |
1520 | ||
77accbf5 | 1521 | local_irq_restore(flags); |
1da177e4 LT |
1522 | } |
1523 | } | |
1524 | ||
1525 | /* | |
1526 | * ---------------------------------------------------------------------- | |
1527 | * | |
1528 | * Here starts the interrupt handling routines. All of the following | |
1529 | * subroutines are declared as inline and are folded into | |
1530 | * rs_interrupt(). They were separated out for readability's sake. | |
1531 | * | |
1532 | * Note: rs_interrupt() is a "fast" interrupt, which means that it | |
1533 | * runs with interrupts turned off. People who may want to modify | |
1534 | * rs_interrupt() should try to keep the interrupt handler as fast as | |
1535 | * possible. After you are done making modifications, it is not a bad | |
1536 | * idea to do: | |
1537 | * | |
1538 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c | |
1539 | * | |
1540 | * and look at the resulting assemble code in serial.s. | |
1541 | * | |
1542 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 | |
1543 | * ----------------------------------------------------------------------- | |
1544 | */ | |
1545 | ||
1546 | /* | |
1547 | * This routine is used by the interrupt handler to schedule | |
1548 | * processing in the software interrupt portion of the driver. | |
1549 | */ | |
41c28ff1 | 1550 | static void rs_sched_event(struct e100_serial *info, int event) |
1da177e4 LT |
1551 | { |
1552 | if (info->event & (1 << event)) | |
1553 | return; | |
1554 | info->event |= 1 << event; | |
1555 | schedule_work(&info->work); | |
1556 | } | |
1557 | ||
1558 | /* The output DMA channel is free - use it to send as many chars as possible | |
1559 | * NOTES: | |
1560 | * We don't pay attention to info->x_char, which means if the TTY wants to | |
1561 | * use XON/XOFF it will set info->x_char but we won't send any X char! | |
1562 | * | |
1563 | * To implement this, we'd just start a DMA send of 1 byte pointing at a | |
1564 | * buffer containing the X char, and skip updating xmit. We'd also have to | |
1565 | * check if the last sent char was the X char when we enter this function | |
1566 | * the next time, to avoid updating xmit with the sent X value. | |
1567 | */ | |
1568 | ||
1569 | static void | |
1570 | transmit_chars_dma(struct e100_serial *info) | |
1571 | { | |
1572 | unsigned int c, sentl; | |
1573 | struct etrax_dma_descr *descr; | |
1574 | ||
1575 | #ifdef CONFIG_SVINTO_SIM | |
1576 | /* This will output too little if tail is not 0 always since | |
1577 | * we don't reloop to send the other part. Anyway this SHOULD be a | |
1578 | * no-op - transmit_chars_dma would never really be called during sim | |
1579 | * since rs_write does not write into the xmit buffer then. | |
1580 | */ | |
1581 | if (info->xmit.tail) | |
1582 | printk("Error in serial.c:transmit_chars-dma(), tail!=0\n"); | |
1583 | if (info->xmit.head != info->xmit.tail) { | |
1584 | SIMCOUT(info->xmit.buf + info->xmit.tail, | |
1585 | CIRC_CNT(info->xmit.head, | |
1586 | info->xmit.tail, | |
1587 | SERIAL_XMIT_SIZE)); | |
1588 | info->xmit.head = info->xmit.tail; /* move back head */ | |
1589 | info->tr_running = 0; | |
1590 | } | |
1591 | return; | |
1592 | #endif | |
1593 | /* acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */ | |
1594 | *info->oclrintradr = | |
1595 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | | |
1596 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); | |
1597 | ||
1598 | #ifdef SERIAL_DEBUG_INTR | |
1599 | if (info->line == SERIAL_DEBUG_LINE) | |
1600 | printk("tc\n"); | |
1601 | #endif | |
1602 | if (!info->tr_running) { | |
1603 | /* weirdo... we shouldn't get here! */ | |
1604 | printk(KERN_WARNING "Achtung: transmit_chars_dma with !tr_running\n"); | |
1605 | return; | |
1606 | } | |
1607 | ||
1608 | descr = &info->tr_descr; | |
1609 | ||
1610 | /* first get the amount of bytes sent during the last DMA transfer, | |
1611 | and update xmit accordingly */ | |
1612 | ||
1613 | /* if the stop bit was not set, all data has been sent */ | |
1614 | if (!(descr->status & d_stop)) { | |
1615 | sentl = descr->sw_len; | |
1616 | } else | |
1617 | /* otherwise we find the amount of data sent here */ | |
1618 | sentl = descr->hw_len; | |
1619 | ||
1620 | DFLOW(DEBUG_LOG(info->line, "TX %i done\n", sentl)); | |
1621 | ||
1622 | /* update stats */ | |
1623 | info->icount.tx += sentl; | |
1624 | ||
1625 | /* update xmit buffer */ | |
1626 | info->xmit.tail = (info->xmit.tail + sentl) & (SERIAL_XMIT_SIZE - 1); | |
1627 | ||
1628 | /* if there is only a few chars left in the buf, wake up the blocked | |
1629 | write if any */ | |
1630 | if (CIRC_CNT(info->xmit.head, | |
1631 | info->xmit.tail, | |
1632 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) | |
1633 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); | |
1634 | ||
1635 | /* find out the largest amount of consecutive bytes we want to send now */ | |
1636 | ||
1637 | c = CIRC_CNT_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
1638 | ||
1639 | /* Don't send all in one DMA transfer - divide it so we wake up | |
1640 | * application before all is sent | |
1641 | */ | |
1642 | ||
1643 | if (c >= 4*WAKEUP_CHARS) | |
1644 | c = c/2; | |
1645 | ||
1646 | if (c <= 0) { | |
1647 | /* our job here is done, don't schedule any new DMA transfer */ | |
1648 | info->tr_running = 0; | |
1649 | ||
1650 | #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER) | |
1651 | if (info->rs485.enabled) { | |
1652 | /* Set a short timer to toggle RTS */ | |
1653 | start_one_shot_timer(&fast_timers_rs485[info->line], | |
1654 | rs485_toggle_rts_timer_function, | |
1655 | (unsigned long)info, | |
1656 | info->char_time_usec*2, | |
1657 | "RS-485"); | |
1658 | } | |
1659 | #endif /* RS485 */ | |
1660 | return; | |
1661 | } | |
1662 | ||
1663 | /* ok we can schedule a dma send of c chars starting at info->xmit.tail */ | |
1664 | /* set up the descriptor correctly for output */ | |
1665 | DFLOW(DEBUG_LOG(info->line, "TX %i\n", c)); | |
1666 | descr->ctrl = d_int | d_eol | d_wait; /* Wait needed for tty_wait_until_sent() */ | |
1667 | descr->sw_len = c; | |
1668 | descr->buf = virt_to_phys(info->xmit.buf + info->xmit.tail); | |
1669 | descr->status = 0; | |
1670 | ||
1671 | *info->ofirstadr = virt_to_phys(descr); /* write to R_DMAx_FIRST */ | |
1672 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start); | |
1673 | ||
1674 | /* DMA is now running (hopefully) */ | |
1675 | } /* transmit_chars_dma */ | |
1676 | ||
1677 | static void | |
1678 | start_transmit(struct e100_serial *info) | |
1679 | { | |
1680 | #if 0 | |
1681 | if (info->line == SERIAL_DEBUG_LINE) | |
1682 | printk("x\n"); | |
1683 | #endif | |
1684 | ||
1685 | info->tr_descr.sw_len = 0; | |
1686 | info->tr_descr.hw_len = 0; | |
1687 | info->tr_descr.status = 0; | |
1688 | info->tr_running = 1; | |
1689 | if (info->uses_dma_out) | |
1690 | transmit_chars_dma(info); | |
1691 | else | |
1692 | e100_enable_serial_tx_ready_irq(info); | |
1693 | } /* start_transmit */ | |
1694 | ||
1695 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER | |
1696 | static int serial_fast_timer_started = 0; | |
1697 | static int serial_fast_timer_expired = 0; | |
1698 | static void flush_timeout_function(unsigned long data); | |
1699 | #define START_FLUSH_FAST_TIMER_TIME(info, string, usec) {\ | |
1700 | unsigned long timer_flags; \ | |
77accbf5 | 1701 | local_irq_save(timer_flags); \ |
1da177e4 LT |
1702 | if (fast_timers[info->line].function == NULL) { \ |
1703 | serial_fast_timer_started++; \ | |
1704 | TIMERD(DEBUG_LOG(info->line, "start_timer %i ", info->line)); \ | |
1705 | TIMERD(DEBUG_LOG(info->line, "num started: %i\n", serial_fast_timer_started)); \ | |
1706 | start_one_shot_timer(&fast_timers[info->line], \ | |
1707 | flush_timeout_function, \ | |
1708 | (unsigned long)info, \ | |
1709 | (usec), \ | |
1710 | string); \ | |
1711 | } \ | |
1712 | else { \ | |
1713 | TIMERD(DEBUG_LOG(info->line, "timer %i already running\n", info->line)); \ | |
1714 | } \ | |
77accbf5 | 1715 | local_irq_restore(timer_flags); \ |
1da177e4 LT |
1716 | } |
1717 | #define START_FLUSH_FAST_TIMER(info, string) START_FLUSH_FAST_TIMER_TIME(info, string, info->flush_time_usec) | |
1718 | ||
1719 | #else | |
1720 | #define START_FLUSH_FAST_TIMER_TIME(info, string, usec) | |
1721 | #define START_FLUSH_FAST_TIMER(info, string) | |
1722 | #endif | |
1723 | ||
1724 | static struct etrax_recv_buffer * | |
1725 | alloc_recv_buffer(unsigned int size) | |
1726 | { | |
1727 | struct etrax_recv_buffer *buffer; | |
1728 | ||
1729 | if (!(buffer = kmalloc(sizeof *buffer + size, GFP_ATOMIC))) | |
1730 | return NULL; | |
1731 | ||
1732 | buffer->next = NULL; | |
1733 | buffer->length = 0; | |
1734 | buffer->error = TTY_NORMAL; | |
1735 | ||
1736 | return buffer; | |
1737 | } | |
1738 | ||
1739 | static void | |
1740 | append_recv_buffer(struct e100_serial *info, struct etrax_recv_buffer *buffer) | |
1741 | { | |
1742 | unsigned long flags; | |
1743 | ||
77accbf5 | 1744 | local_irq_save(flags); |
1da177e4 LT |
1745 | |
1746 | if (!info->first_recv_buffer) | |
1747 | info->first_recv_buffer = buffer; | |
1748 | else | |
1749 | info->last_recv_buffer->next = buffer; | |
1750 | ||
1751 | info->last_recv_buffer = buffer; | |
1752 | ||
1753 | info->recv_cnt += buffer->length; | |
1754 | if (info->recv_cnt > info->max_recv_cnt) | |
1755 | info->max_recv_cnt = info->recv_cnt; | |
1756 | ||
77accbf5 | 1757 | local_irq_restore(flags); |
1da177e4 LT |
1758 | } |
1759 | ||
1760 | static int | |
1761 | add_char_and_flag(struct e100_serial *info, unsigned char data, unsigned char flag) | |
1762 | { | |
1763 | struct etrax_recv_buffer *buffer; | |
1764 | if (info->uses_dma_in) { | |
1765 | if (!(buffer = alloc_recv_buffer(4))) | |
1766 | return 0; | |
1767 | ||
1768 | buffer->length = 1; | |
1769 | buffer->error = flag; | |
1770 | buffer->buffer[0] = data; | |
1771 | ||
1772 | append_recv_buffer(info, buffer); | |
1773 | ||
1774 | info->icount.rx++; | |
1775 | } else { | |
a88487c7 | 1776 | struct tty_struct *tty = info->port.tty; |
77accbf5 | 1777 | tty_insert_flip_char(tty, data, flag); |
1da177e4 LT |
1778 | info->icount.rx++; |
1779 | } | |
1780 | ||
1781 | return 1; | |
1782 | } | |
1783 | ||
41c28ff1 AB |
1784 | static unsigned int handle_descr_data(struct e100_serial *info, |
1785 | struct etrax_dma_descr *descr, | |
1786 | unsigned int recvl) | |
1da177e4 LT |
1787 | { |
1788 | struct etrax_recv_buffer *buffer = phys_to_virt(descr->buf) - sizeof *buffer; | |
1789 | ||
1790 | if (info->recv_cnt + recvl > 65536) { | |
1791 | printk(KERN_CRIT | |
71cc2c21 | 1792 | "%s: Too much pending incoming serial data! Dropping %u bytes.\n", __func__, recvl); |
1da177e4 LT |
1793 | return 0; |
1794 | } | |
1795 | ||
1796 | buffer->length = recvl; | |
1797 | ||
1798 | if (info->errorcode == ERRCODE_SET_BREAK) | |
1799 | buffer->error = TTY_BREAK; | |
1800 | info->errorcode = 0; | |
1801 | ||
1802 | append_recv_buffer(info, buffer); | |
1803 | ||
1804 | if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE))) | |
71cc2c21 | 1805 | panic("%s: Failed to allocate memory for receive buffer!\n", __func__); |
1da177e4 LT |
1806 | |
1807 | descr->buf = virt_to_phys(buffer->buffer); | |
1808 | ||
1809 | return recvl; | |
1810 | } | |
1811 | ||
41c28ff1 | 1812 | static unsigned int handle_all_descr_data(struct e100_serial *info) |
1da177e4 LT |
1813 | { |
1814 | struct etrax_dma_descr *descr; | |
1815 | unsigned int recvl; | |
1816 | unsigned int ret = 0; | |
1817 | ||
1818 | while (1) | |
1819 | { | |
1820 | descr = &info->rec_descr[info->cur_rec_descr]; | |
1821 | ||
1822 | if (descr == phys_to_virt(*info->idescradr)) | |
1823 | break; | |
1824 | ||
1825 | if (++info->cur_rec_descr == SERIAL_RECV_DESCRIPTORS) | |
1826 | info->cur_rec_descr = 0; | |
1827 | ||
1828 | /* find out how many bytes were read */ | |
1829 | ||
1830 | /* if the eop bit was not set, all data has been received */ | |
1831 | if (!(descr->status & d_eop)) { | |
1832 | recvl = descr->sw_len; | |
1833 | } else { | |
1834 | /* otherwise we find the amount of data received here */ | |
1835 | recvl = descr->hw_len; | |
1836 | } | |
1837 | ||
1838 | /* Reset the status information */ | |
1839 | descr->status = 0; | |
1840 | ||
1841 | DFLOW( DEBUG_LOG(info->line, "RX %lu\n", recvl); | |
a88487c7 | 1842 | if (info->port.tty->stopped) { |
1da177e4 LT |
1843 | unsigned char *buf = phys_to_virt(descr->buf); |
1844 | DEBUG_LOG(info->line, "rx 0x%02X\n", buf[0]); | |
1845 | DEBUG_LOG(info->line, "rx 0x%02X\n", buf[1]); | |
1846 | DEBUG_LOG(info->line, "rx 0x%02X\n", buf[2]); | |
1847 | } | |
1848 | ); | |
1849 | ||
1850 | /* update stats */ | |
1851 | info->icount.rx += recvl; | |
1852 | ||
1853 | ret += handle_descr_data(info, descr, recvl); | |
1854 | } | |
1855 | ||
1856 | return ret; | |
1857 | } | |
1858 | ||
41c28ff1 | 1859 | static void receive_chars_dma(struct e100_serial *info) |
1da177e4 LT |
1860 | { |
1861 | struct tty_struct *tty; | |
1862 | unsigned char rstat; | |
1863 | ||
1864 | #ifdef CONFIG_SVINTO_SIM | |
1865 | /* No receive in the simulator. Will probably be when the rest of | |
1866 | * the serial interface works, and this piece will just be removed. | |
1867 | */ | |
1868 | return; | |
1869 | #endif | |
1870 | ||
1871 | /* Acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */ | |
1872 | *info->iclrintradr = | |
1873 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | | |
1874 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); | |
1875 | ||
a88487c7 | 1876 | tty = info->port.tty; |
1da177e4 LT |
1877 | if (!tty) /* Something wrong... */ |
1878 | return; | |
1879 | ||
1880 | #ifdef SERIAL_HANDLE_EARLY_ERRORS | |
1881 | if (info->uses_dma_in) | |
1882 | e100_enable_serial_data_irq(info); | |
1883 | #endif | |
1884 | ||
1885 | if (info->errorcode == ERRCODE_INSERT_BREAK) | |
1886 | add_char_and_flag(info, '\0', TTY_BREAK); | |
1887 | ||
1888 | handle_all_descr_data(info); | |
1889 | ||
1890 | /* Read the status register to detect errors */ | |
d7283353 | 1891 | rstat = info->ioport[REG_STATUS]; |
1da177e4 LT |
1892 | if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) { |
1893 | DFLOW(DEBUG_LOG(info->line, "XOFF detect stat %x\n", rstat)); | |
1894 | } | |
1895 | ||
1896 | if (rstat & SER_ERROR_MASK) { | |
1897 | /* If we got an error, we must reset it by reading the | |
1898 | * data_in field | |
1899 | */ | |
d7283353 | 1900 | unsigned char data = info->ioport[REG_DATA]; |
1da177e4 LT |
1901 | |
1902 | PROCSTAT(ser_stat[info->line].errors_cnt++); | |
1903 | DEBUG_LOG(info->line, "#dERR: s d 0x%04X\n", | |
1904 | ((rstat & SER_ERROR_MASK) << 8) | data); | |
1905 | ||
1906 | if (rstat & SER_PAR_ERR_MASK) | |
1907 | add_char_and_flag(info, data, TTY_PARITY); | |
1908 | else if (rstat & SER_OVERRUN_MASK) | |
1909 | add_char_and_flag(info, data, TTY_OVERRUN); | |
1910 | else if (rstat & SER_FRAMING_ERR_MASK) | |
1911 | add_char_and_flag(info, data, TTY_FRAME); | |
1912 | } | |
1913 | ||
1914 | START_FLUSH_FAST_TIMER(info, "receive_chars"); | |
1915 | ||
1916 | /* Restart the receiving DMA */ | |
1917 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart); | |
1918 | } | |
1919 | ||
41c28ff1 | 1920 | static int start_recv_dma(struct e100_serial *info) |
1da177e4 LT |
1921 | { |
1922 | struct etrax_dma_descr *descr = info->rec_descr; | |
1923 | struct etrax_recv_buffer *buffer; | |
1924 | int i; | |
1925 | ||
1926 | /* Set up the receiving descriptors */ | |
1927 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) { | |
1928 | if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE))) | |
71cc2c21 | 1929 | panic("%s: Failed to allocate memory for receive buffer!\n", __func__); |
1da177e4 LT |
1930 | |
1931 | descr[i].ctrl = d_int; | |
1932 | descr[i].buf = virt_to_phys(buffer->buffer); | |
1933 | descr[i].sw_len = SERIAL_DESCR_BUF_SIZE; | |
1934 | descr[i].hw_len = 0; | |
1935 | descr[i].status = 0; | |
1936 | descr[i].next = virt_to_phys(&descr[i+1]); | |
1937 | } | |
1938 | ||
1939 | /* Link the last descriptor to the first */ | |
1940 | descr[i-1].next = virt_to_phys(&descr[0]); | |
1941 | ||
1942 | /* Start with the first descriptor in the list */ | |
1943 | info->cur_rec_descr = 0; | |
1944 | ||
1945 | /* Start the DMA */ | |
1946 | *info->ifirstadr = virt_to_phys(&descr[info->cur_rec_descr]); | |
1947 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start); | |
1948 | ||
1949 | /* Input DMA should be running now */ | |
1950 | return 1; | |
1951 | } | |
1952 | ||
1953 | static void | |
1954 | start_receive(struct e100_serial *info) | |
1955 | { | |
1956 | #ifdef CONFIG_SVINTO_SIM | |
1957 | /* No receive in the simulator. Will probably be when the rest of | |
1958 | * the serial interface works, and this piece will just be removed. | |
1959 | */ | |
1960 | return; | |
1961 | #endif | |
1da177e4 LT |
1962 | if (info->uses_dma_in) { |
1963 | /* reset the input dma channel to be sure it works */ | |
1964 | ||
1965 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); | |
1966 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) == | |
1967 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); | |
1968 | ||
1969 | start_recv_dma(info); | |
1970 | } | |
1971 | } | |
1972 | ||
1973 | ||
1da177e4 LT |
1974 | /* the bits in the MASK2 register are laid out like this: |
1975 | DMAI_EOP DMAI_DESCR DMAO_EOP DMAO_DESCR | |
1976 | where I is the input channel and O is the output channel for the port. | |
1977 | info->irq is the bit number for the DMAO_DESCR so to check the others we | |
1978 | shift info->irq to the left. | |
1979 | */ | |
1980 | ||
1981 | /* dma output channel interrupt handler | |
1982 | this interrupt is called from DMA2(ser2), DMA4(ser3), DMA6(ser0) or | |
1983 | DMA8(ser1) when they have finished a descriptor with the intr flag set. | |
1984 | */ | |
1985 | ||
1986 | static irqreturn_t | |
7d12e780 | 1987 | tr_interrupt(int irq, void *dev_id) |
1da177e4 LT |
1988 | { |
1989 | struct e100_serial *info; | |
1990 | unsigned long ireg; | |
1991 | int i; | |
1992 | int handled = 0; | |
1993 | ||
1994 | #ifdef CONFIG_SVINTO_SIM | |
1995 | /* No receive in the simulator. Will probably be when the rest of | |
1996 | * the serial interface works, and this piece will just be removed. | |
1997 | */ | |
1998 | { | |
1999 | const char *s = "What? tr_interrupt in simulator??\n"; | |
2000 | SIMCOUT(s,strlen(s)); | |
2001 | } | |
2002 | return IRQ_HANDLED; | |
2003 | #endif | |
2004 | ||
2005 | /* find out the line that caused this irq and get it from rs_table */ | |
2006 | ||
2007 | ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */ | |
2008 | ||
2009 | for (i = 0; i < NR_PORTS; i++) { | |
2010 | info = rs_table + i; | |
2011 | if (!info->enabled || !info->uses_dma_out) | |
2012 | continue; | |
2013 | /* check for dma_descr (don't need to check for dma_eop in output dma for serial */ | |
2014 | if (ireg & info->irq) { | |
2015 | handled = 1; | |
2016 | /* we can send a new dma bunch. make it so. */ | |
2017 | DINTR2(DEBUG_LOG(info->line, "tr_interrupt %i\n", i)); | |
2018 | /* Read jiffies_usec first, | |
2019 | * we want this time to be as late as possible | |
2020 | */ | |
2021 | PROCSTAT(ser_stat[info->line].tx_dma_ints++); | |
2022 | info->last_tx_active_usec = GET_JIFFIES_USEC(); | |
2023 | info->last_tx_active = jiffies; | |
2024 | transmit_chars_dma(info); | |
2025 | } | |
2026 | ||
2027 | /* FIXME: here we should really check for a change in the | |
2028 | status lines and if so call status_handle(info) */ | |
2029 | } | |
2030 | return IRQ_RETVAL(handled); | |
2031 | } /* tr_interrupt */ | |
2032 | ||
2033 | /* dma input channel interrupt handler */ | |
2034 | ||
2035 | static irqreturn_t | |
7d12e780 | 2036 | rec_interrupt(int irq, void *dev_id) |
1da177e4 LT |
2037 | { |
2038 | struct e100_serial *info; | |
2039 | unsigned long ireg; | |
2040 | int i; | |
2041 | int handled = 0; | |
2042 | ||
2043 | #ifdef CONFIG_SVINTO_SIM | |
2044 | /* No receive in the simulator. Will probably be when the rest of | |
2045 | * the serial interface works, and this piece will just be removed. | |
2046 | */ | |
2047 | { | |
2048 | const char *s = "What? rec_interrupt in simulator??\n"; | |
2049 | SIMCOUT(s,strlen(s)); | |
2050 | } | |
2051 | return IRQ_HANDLED; | |
2052 | #endif | |
2053 | ||
2054 | /* find out the line that caused this irq and get it from rs_table */ | |
2055 | ||
2056 | ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */ | |
2057 | ||
2058 | for (i = 0; i < NR_PORTS; i++) { | |
2059 | info = rs_table + i; | |
2060 | if (!info->enabled || !info->uses_dma_in) | |
2061 | continue; | |
2062 | /* check for both dma_eop and dma_descr for the input dma channel */ | |
2063 | if (ireg & ((info->irq << 2) | (info->irq << 3))) { | |
2064 | handled = 1; | |
2065 | /* we have received something */ | |
2066 | receive_chars_dma(info); | |
2067 | } | |
2068 | ||
2069 | /* FIXME: here we should really check for a change in the | |
2070 | status lines and if so call status_handle(info) */ | |
2071 | } | |
2072 | return IRQ_RETVAL(handled); | |
2073 | } /* rec_interrupt */ | |
2074 | ||
41c28ff1 | 2075 | static int force_eop_if_needed(struct e100_serial *info) |
1da177e4 LT |
2076 | { |
2077 | /* We check data_avail bit to determine if data has | |
2078 | * arrived since last time | |
2079 | */ | |
d7283353 | 2080 | unsigned char rstat = info->ioport[REG_STATUS]; |
1da177e4 LT |
2081 | |
2082 | /* error or datavail? */ | |
2083 | if (rstat & SER_ERROR_MASK) { | |
2084 | /* Some error has occurred. If there has been valid data, an | |
2085 | * EOP interrupt will be made automatically. If no data, the | |
2086 | * normal ser_interrupt should be enabled and handle it. | |
2087 | * So do nothing! | |
2088 | */ | |
2089 | DEBUG_LOG(info->line, "timeout err: rstat 0x%03X\n", | |
2090 | rstat | (info->line << 8)); | |
2091 | return 0; | |
2092 | } | |
2093 | ||
2094 | if (rstat & SER_DATA_AVAIL_MASK) { | |
2095 | /* Ok data, no error, count it */ | |
2096 | TIMERD(DEBUG_LOG(info->line, "timeout: rstat 0x%03X\n", | |
2097 | rstat | (info->line << 8))); | |
2098 | /* Read data to clear status flags */ | |
d7283353 | 2099 | (void)info->ioport[REG_DATA]; |
1da177e4 LT |
2100 | |
2101 | info->forced_eop = 0; | |
2102 | START_FLUSH_FAST_TIMER(info, "magic"); | |
2103 | return 0; | |
2104 | } | |
2105 | ||
2106 | /* hit the timeout, force an EOP for the input | |
2107 | * dma channel if we haven't already | |
2108 | */ | |
2109 | if (!info->forced_eop) { | |
2110 | info->forced_eop = 1; | |
2111 | PROCSTAT(ser_stat[info->line].timeout_flush_cnt++); | |
2112 | TIMERD(DEBUG_LOG(info->line, "timeout EOP %i\n", info->line)); | |
2113 | FORCE_EOP(info); | |
2114 | } | |
2115 | ||
2116 | return 1; | |
2117 | } | |
2118 | ||
41c28ff1 | 2119 | static void flush_to_flip_buffer(struct e100_serial *info) |
1da177e4 LT |
2120 | { |
2121 | struct tty_struct *tty; | |
2122 | struct etrax_recv_buffer *buffer; | |
1da177e4 | 2123 | unsigned long flags; |
1da177e4 | 2124 | |
77accbf5 | 2125 | local_irq_save(flags); |
a88487c7 | 2126 | tty = info->port.tty; |
1da177e4 | 2127 | |
77accbf5 JN |
2128 | if (!tty) { |
2129 | local_irq_restore(flags); | |
1da177e4 LT |
2130 | return; |
2131 | } | |
2132 | ||
2090ab05 | 2133 | while ((buffer = info->first_recv_buffer) != NULL) { |
1da177e4 LT |
2134 | unsigned int count = buffer->length; |
2135 | ||
77accbf5 | 2136 | tty_insert_flip_string(tty, buffer->buffer, count); |
1da177e4 | 2137 | info->recv_cnt -= count; |
1da177e4 LT |
2138 | |
2139 | if (count == buffer->length) { | |
2140 | info->first_recv_buffer = buffer->next; | |
2141 | kfree(buffer); | |
2142 | } else { | |
2143 | buffer->length -= count; | |
2144 | memmove(buffer->buffer, buffer->buffer + count, buffer->length); | |
2145 | buffer->error = TTY_NORMAL; | |
2146 | } | |
2147 | } | |
2148 | ||
2149 | if (!info->first_recv_buffer) | |
2150 | info->last_recv_buffer = NULL; | |
2151 | ||
77accbf5 | 2152 | local_irq_restore(flags); |
1da177e4 | 2153 | |
77accbf5 | 2154 | /* This includes a check for low-latency */ |
1da177e4 LT |
2155 | tty_flip_buffer_push(tty); |
2156 | } | |
2157 | ||
41c28ff1 | 2158 | static void check_flush_timeout(struct e100_serial *info) |
1da177e4 LT |
2159 | { |
2160 | /* Flip what we've got (if we can) */ | |
2161 | flush_to_flip_buffer(info); | |
2162 | ||
2163 | /* We might need to flip later, but not to fast | |
2164 | * since the system is busy processing input... */ | |
2165 | if (info->first_recv_buffer) | |
2166 | START_FLUSH_FAST_TIMER_TIME(info, "flip", 2000); | |
2167 | ||
2168 | /* Force eop last, since data might have come while we're processing | |
2169 | * and if we started the slow timer above, we won't start a fast | |
2170 | * below. | |
2171 | */ | |
2172 | force_eop_if_needed(info); | |
2173 | } | |
2174 | ||
2175 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER | |
2176 | static void flush_timeout_function(unsigned long data) | |
2177 | { | |
2178 | struct e100_serial *info = (struct e100_serial *)data; | |
2179 | ||
2180 | fast_timers[info->line].function = NULL; | |
2181 | serial_fast_timer_expired++; | |
2182 | TIMERD(DEBUG_LOG(info->line, "flush_timout %i ", info->line)); | |
2183 | TIMERD(DEBUG_LOG(info->line, "num expired: %i\n", serial_fast_timer_expired)); | |
2184 | check_flush_timeout(info); | |
2185 | } | |
2186 | ||
2187 | #else | |
2188 | ||
2189 | /* dma fifo/buffer timeout handler | |
2190 | forces an end-of-packet for the dma input channel if no chars | |
2191 | have been received for CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS/100 s. | |
2192 | */ | |
2193 | ||
2194 | static struct timer_list flush_timer; | |
2195 | ||
2196 | static void | |
2197 | timed_flush_handler(unsigned long ptr) | |
2198 | { | |
2199 | struct e100_serial *info; | |
2200 | int i; | |
2201 | ||
2202 | #ifdef CONFIG_SVINTO_SIM | |
2203 | return; | |
2204 | #endif | |
2205 | ||
2206 | for (i = 0; i < NR_PORTS; i++) { | |
2207 | info = rs_table + i; | |
2208 | if (info->uses_dma_in) | |
2209 | check_flush_timeout(info); | |
2210 | } | |
2211 | ||
2212 | /* restart flush timer */ | |
2213 | mod_timer(&flush_timer, jiffies + CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS); | |
2214 | } | |
2215 | #endif | |
2216 | ||
2217 | #ifdef SERIAL_HANDLE_EARLY_ERRORS | |
2218 | ||
2219 | /* If there is an error (ie break) when the DMA is running and | |
2220 | * there are no bytes in the fifo the DMA is stopped and we get no | |
2221 | * eop interrupt. Thus we have to monitor the first bytes on a DMA | |
2222 | * transfer, and if it is without error we can turn the serial | |
2223 | * interrupts off. | |
2224 | */ | |
2225 | ||
2226 | /* | |
2227 | BREAK handling on ETRAX 100: | |
2228 | ETRAX will generate interrupt although there is no stop bit between the | |
2229 | characters. | |
2230 | ||
2231 | Depending on how long the break sequence is, the end of the breaksequence | |
2232 | will look differently: | |
2233 | | indicates start/end of a character. | |
2234 | ||
2235 | B= Break character (0x00) with framing error. | |
2236 | E= Error byte with parity error received after B characters. | |
2237 | F= "Faked" valid byte received immediately after B characters. | |
2238 | V= Valid byte | |
2239 | ||
2240 | 1. | |
2241 | B BL ___________________________ V | |
2242 | .._|__________|__________| |valid data | | |
2243 | ||
2244 | Multiple frame errors with data == 0x00 (B), | |
2245 | the timing matches up "perfectly" so no extra ending char is detected. | |
2246 | The RXD pin is 1 in the last interrupt, in that case | |
2247 | we set info->errorcode = ERRCODE_INSERT_BREAK, but we can't really | |
2248 | know if another byte will come and this really is case 2. below | |
2249 | (e.g F=0xFF or 0xFE) | |
2250 | If RXD pin is 0 we can expect another character (see 2. below). | |
2251 | ||
2252 | ||
2253 | 2. | |
2254 | ||
2255 | B B E or F__________________..__ V | |
2256 | .._|__________|__________|______ | |valid data | |
2257 | "valid" or | |
2258 | parity error | |
2259 | ||
2260 | Multiple frame errors with data == 0x00 (B), | |
2261 | but the part of the break trigs is interpreted as a start bit (and possibly | |
2262 | some 0 bits followed by a number of 1 bits and a stop bit). | |
2263 | Depending on parity settings etc. this last character can be either | |
2264 | a fake "valid" char (F) or have a parity error (E). | |
2265 | ||
2266 | If the character is valid it will be put in the buffer, | |
2267 | we set info->errorcode = ERRCODE_SET_BREAK so the receive interrupt | |
2268 | will set the flags so the tty will handle it, | |
2269 | if it's an error byte it will not be put in the buffer | |
2270 | and we set info->errorcode = ERRCODE_INSERT_BREAK. | |
2271 | ||
2272 | To distinguish a V byte in 1. from an F byte in 2. we keep a timestamp | |
2273 | of the last faulty char (B) and compares it with the current time: | |
2274 | If the time elapsed time is less then 2*char_time_usec we will assume | |
2275 | it's a faked F char and not a Valid char and set | |
2276 | info->errorcode = ERRCODE_SET_BREAK. | |
2277 | ||
2278 | Flaws in the above solution: | |
2279 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
2280 | We use the timer to distinguish a F character from a V character, | |
2281 | if a V character is to close after the break we might make the wrong decision. | |
2282 | ||
2283 | TODO: The break will be delayed until an F or V character is received. | |
2284 | ||
2285 | */ | |
2286 | ||
41c28ff1 | 2287 | static |
1da177e4 LT |
2288 | struct e100_serial * handle_ser_rx_interrupt_no_dma(struct e100_serial *info) |
2289 | { | |
2290 | unsigned long data_read; | |
a88487c7 | 2291 | struct tty_struct *tty = info->port.tty; |
1da177e4 LT |
2292 | |
2293 | if (!tty) { | |
2294 | printk("!NO TTY!\n"); | |
2295 | return info; | |
2296 | } | |
77accbf5 | 2297 | |
1da177e4 | 2298 | /* Read data and status at the same time */ |
d7283353 | 2299 | data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]); |
1da177e4 LT |
2300 | more_data: |
2301 | if (data_read & IO_MASK(R_SERIAL0_READ, xoff_detect) ) { | |
2302 | DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0)); | |
2303 | } | |
2304 | DINTR2(DEBUG_LOG(info->line, "ser_rx %c\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read))); | |
2305 | ||
2306 | if (data_read & ( IO_MASK(R_SERIAL0_READ, framing_err) | | |
2307 | IO_MASK(R_SERIAL0_READ, par_err) | | |
2308 | IO_MASK(R_SERIAL0_READ, overrun) )) { | |
2309 | /* An error */ | |
2310 | info->last_rx_active_usec = GET_JIFFIES_USEC(); | |
2311 | info->last_rx_active = jiffies; | |
2312 | DINTR1(DEBUG_LOG(info->line, "ser_rx err stat_data %04X\n", data_read)); | |
2313 | DLOG_INT_TRIG( | |
2314 | if (!log_int_trig1_pos) { | |
2315 | log_int_trig1_pos = log_int_pos; | |
2316 | log_int(rdpc(), 0, 0); | |
2317 | } | |
2318 | ); | |
2319 | ||
2320 | ||
2321 | if ( ((data_read & IO_MASK(R_SERIAL0_READ, data_in)) == 0) && | |
2322 | (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) ) { | |
2323 | /* Most likely a break, but we get interrupts over and | |
2324 | * over again. | |
2325 | */ | |
2326 | ||
2327 | if (!info->break_detected_cnt) { | |
2328 | DEBUG_LOG(info->line, "#BRK start\n", 0); | |
2329 | } | |
2330 | if (data_read & IO_MASK(R_SERIAL0_READ, rxd)) { | |
2331 | /* The RX pin is high now, so the break | |
2332 | * must be over, but.... | |
2333 | * we can't really know if we will get another | |
2334 | * last byte ending the break or not. | |
2335 | * And we don't know if the byte (if any) will | |
2336 | * have an error or look valid. | |
2337 | */ | |
2338 | DEBUG_LOG(info->line, "# BL BRK\n", 0); | |
2339 | info->errorcode = ERRCODE_INSERT_BREAK; | |
2340 | } | |
2341 | info->break_detected_cnt++; | |
2342 | } else { | |
2343 | /* The error does not look like a break, but could be | |
2344 | * the end of one | |
2345 | */ | |
2346 | if (info->break_detected_cnt) { | |
2347 | DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt); | |
2348 | info->errorcode = ERRCODE_INSERT_BREAK; | |
2349 | } else { | |
77accbf5 JN |
2350 | unsigned char data = IO_EXTRACT(R_SERIAL0_READ, |
2351 | data_in, data_read); | |
2352 | char flag = TTY_NORMAL; | |
1da177e4 | 2353 | if (info->errorcode == ERRCODE_INSERT_BREAK) { |
a88487c7 | 2354 | struct tty_struct *tty = info->port.tty; |
77accbf5 | 2355 | tty_insert_flip_char(tty, 0, flag); |
1da177e4 LT |
2356 | info->icount.rx++; |
2357 | } | |
1da177e4 LT |
2358 | |
2359 | if (data_read & IO_MASK(R_SERIAL0_READ, par_err)) { | |
2360 | info->icount.parity++; | |
77accbf5 | 2361 | flag = TTY_PARITY; |
1da177e4 LT |
2362 | } else if (data_read & IO_MASK(R_SERIAL0_READ, overrun)) { |
2363 | info->icount.overrun++; | |
77accbf5 | 2364 | flag = TTY_OVERRUN; |
1da177e4 LT |
2365 | } else if (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) { |
2366 | info->icount.frame++; | |
77accbf5 | 2367 | flag = TTY_FRAME; |
1da177e4 | 2368 | } |
77accbf5 | 2369 | tty_insert_flip_char(tty, data, flag); |
1da177e4 LT |
2370 | info->errorcode = 0; |
2371 | } | |
2372 | info->break_detected_cnt = 0; | |
2373 | } | |
2374 | } else if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) { | |
2375 | /* No error */ | |
2376 | DLOG_INT_TRIG( | |
2377 | if (!log_int_trig1_pos) { | |
2378 | if (log_int_pos >= log_int_size) { | |
2379 | log_int_pos = 0; | |
2380 | } | |
2381 | log_int_trig0_pos = log_int_pos; | |
2382 | log_int(rdpc(), 0, 0); | |
2383 | } | |
2384 | ); | |
77accbf5 JN |
2385 | tty_insert_flip_char(tty, |
2386 | IO_EXTRACT(R_SERIAL0_READ, data_in, data_read), | |
2387 | TTY_NORMAL); | |
1da177e4 LT |
2388 | } else { |
2389 | DEBUG_LOG(info->line, "ser_rx int but no data_avail %08lX\n", data_read); | |
2390 | } | |
2391 | ||
2392 | ||
1da177e4 | 2393 | info->icount.rx++; |
d7283353 | 2394 | data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]); |
1da177e4 LT |
2395 | if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) { |
2396 | DEBUG_LOG(info->line, "ser_rx %c in loop\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read)); | |
2397 | goto more_data; | |
2398 | } | |
2399 | ||
a88487c7 | 2400 | tty_flip_buffer_push(info->port.tty); |
1da177e4 LT |
2401 | return info; |
2402 | } | |
2403 | ||
41c28ff1 | 2404 | static struct e100_serial* handle_ser_rx_interrupt(struct e100_serial *info) |
1da177e4 LT |
2405 | { |
2406 | unsigned char rstat; | |
2407 | ||
2408 | #ifdef SERIAL_DEBUG_INTR | |
2409 | printk("Interrupt from serport %d\n", i); | |
2410 | #endif | |
2411 | /* DEBUG_LOG(info->line, "ser_interrupt stat %03X\n", rstat | (i << 8)); */ | |
2412 | if (!info->uses_dma_in) { | |
2413 | return handle_ser_rx_interrupt_no_dma(info); | |
2414 | } | |
2415 | /* DMA is used */ | |
d7283353 | 2416 | rstat = info->ioport[REG_STATUS]; |
1da177e4 LT |
2417 | if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) { |
2418 | DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0)); | |
2419 | } | |
2420 | ||
2421 | if (rstat & SER_ERROR_MASK) { | |
2422 | unsigned char data; | |
2423 | ||
2424 | info->last_rx_active_usec = GET_JIFFIES_USEC(); | |
2425 | info->last_rx_active = jiffies; | |
2426 | /* If we got an error, we must reset it by reading the | |
2427 | * data_in field | |
2428 | */ | |
d7283353 | 2429 | data = info->ioport[REG_DATA]; |
1da177e4 LT |
2430 | DINTR1(DEBUG_LOG(info->line, "ser_rx! %c\n", data)); |
2431 | DINTR1(DEBUG_LOG(info->line, "ser_rx err stat %02X\n", rstat)); | |
2432 | if (!data && (rstat & SER_FRAMING_ERR_MASK)) { | |
2433 | /* Most likely a break, but we get interrupts over and | |
2434 | * over again. | |
2435 | */ | |
2436 | ||
2437 | if (!info->break_detected_cnt) { | |
2438 | DEBUG_LOG(info->line, "#BRK start\n", 0); | |
2439 | } | |
2440 | if (rstat & SER_RXD_MASK) { | |
2441 | /* The RX pin is high now, so the break | |
2442 | * must be over, but.... | |
2443 | * we can't really know if we will get another | |
2444 | * last byte ending the break or not. | |
2445 | * And we don't know if the byte (if any) will | |
2446 | * have an error or look valid. | |
2447 | */ | |
2448 | DEBUG_LOG(info->line, "# BL BRK\n", 0); | |
2449 | info->errorcode = ERRCODE_INSERT_BREAK; | |
2450 | } | |
2451 | info->break_detected_cnt++; | |
2452 | } else { | |
2453 | /* The error does not look like a break, but could be | |
2454 | * the end of one | |
2455 | */ | |
2456 | if (info->break_detected_cnt) { | |
2457 | DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt); | |
2458 | info->errorcode = ERRCODE_INSERT_BREAK; | |
2459 | } else { | |
2460 | if (info->errorcode == ERRCODE_INSERT_BREAK) { | |
2461 | info->icount.brk++; | |
2462 | add_char_and_flag(info, '\0', TTY_BREAK); | |
2463 | } | |
2464 | ||
2465 | if (rstat & SER_PAR_ERR_MASK) { | |
2466 | info->icount.parity++; | |
2467 | add_char_and_flag(info, data, TTY_PARITY); | |
2468 | } else if (rstat & SER_OVERRUN_MASK) { | |
2469 | info->icount.overrun++; | |
2470 | add_char_and_flag(info, data, TTY_OVERRUN); | |
2471 | } else if (rstat & SER_FRAMING_ERR_MASK) { | |
2472 | info->icount.frame++; | |
2473 | add_char_and_flag(info, data, TTY_FRAME); | |
2474 | } | |
2475 | ||
2476 | info->errorcode = 0; | |
2477 | } | |
2478 | info->break_detected_cnt = 0; | |
2479 | DEBUG_LOG(info->line, "#iERR s d %04X\n", | |
2480 | ((rstat & SER_ERROR_MASK) << 8) | data); | |
2481 | } | |
2482 | PROCSTAT(ser_stat[info->line].early_errors_cnt++); | |
2483 | } else { /* It was a valid byte, now let the DMA do the rest */ | |
2484 | unsigned long curr_time_u = GET_JIFFIES_USEC(); | |
2485 | unsigned long curr_time = jiffies; | |
2486 | ||
2487 | if (info->break_detected_cnt) { | |
2488 | /* Detect if this character is a new valid char or the | |
2489 | * last char in a break sequence: If LSBits are 0 and | |
2490 | * MSBits are high AND the time is close to the | |
2491 | * previous interrupt we should discard it. | |
2492 | */ | |
2493 | long elapsed_usec = | |
2494 | (curr_time - info->last_rx_active) * (1000000/HZ) + | |
2495 | curr_time_u - info->last_rx_active_usec; | |
2496 | if (elapsed_usec < 2*info->char_time_usec) { | |
2497 | DEBUG_LOG(info->line, "FBRK %i\n", info->line); | |
2498 | /* Report as BREAK (error) and let | |
2499 | * receive_chars_dma() handle it | |
2500 | */ | |
2501 | info->errorcode = ERRCODE_SET_BREAK; | |
2502 | } else { | |
2503 | DEBUG_LOG(info->line, "Not end of BRK (V)%i\n", info->line); | |
2504 | } | |
2505 | DEBUG_LOG(info->line, "num brk %i\n", info->break_detected_cnt); | |
2506 | } | |
2507 | ||
2508 | #ifdef SERIAL_DEBUG_INTR | |
2509 | printk("** OK, disabling ser_interrupts\n"); | |
2510 | #endif | |
2511 | e100_disable_serial_data_irq(info); | |
2512 | DINTR2(DEBUG_LOG(info->line, "ser_rx OK %d\n", info->line)); | |
2513 | info->break_detected_cnt = 0; | |
2514 | ||
2515 | PROCSTAT(ser_stat[info->line].ser_ints_ok_cnt++); | |
2516 | } | |
2517 | /* Restarting the DMA never hurts */ | |
2518 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart); | |
2519 | START_FLUSH_FAST_TIMER(info, "ser_int"); | |
2520 | return info; | |
2521 | } /* handle_ser_rx_interrupt */ | |
2522 | ||
41c28ff1 | 2523 | static void handle_ser_tx_interrupt(struct e100_serial *info) |
1da177e4 LT |
2524 | { |
2525 | unsigned long flags; | |
2526 | ||
2527 | if (info->x_char) { | |
2528 | unsigned char rstat; | |
2529 | DFLOW(DEBUG_LOG(info->line, "tx_int: xchar 0x%02X\n", info->x_char)); | |
77accbf5 | 2530 | local_irq_save(flags); |
d7283353 | 2531 | rstat = info->ioport[REG_STATUS]; |
1da177e4 LT |
2532 | DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat)); |
2533 | ||
d7283353 | 2534 | info->ioport[REG_TR_DATA] = info->x_char; |
1da177e4 LT |
2535 | info->icount.tx++; |
2536 | info->x_char = 0; | |
2537 | /* We must enable since it is disabled in ser_interrupt */ | |
2538 | e100_enable_serial_tx_ready_irq(info); | |
77accbf5 | 2539 | local_irq_restore(flags); |
1da177e4 LT |
2540 | return; |
2541 | } | |
2542 | if (info->uses_dma_out) { | |
2543 | unsigned char rstat; | |
2544 | int i; | |
2545 | /* We only use normal tx interrupt when sending x_char */ | |
2546 | DFLOW(DEBUG_LOG(info->line, "tx_int: xchar sent\n", 0)); | |
77accbf5 | 2547 | local_irq_save(flags); |
d7283353 | 2548 | rstat = info->ioport[REG_STATUS]; |
1da177e4 LT |
2549 | DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat)); |
2550 | e100_disable_serial_tx_ready_irq(info); | |
a88487c7 TI |
2551 | if (info->port.tty->stopped) |
2552 | rs_stop(info->port.tty); | |
1da177e4 LT |
2553 | /* Enable the DMA channel and tell it to continue */ |
2554 | e100_enable_txdma_channel(info); | |
2555 | /* Wait 12 cycles before doing the DMA command */ | |
2556 | for(i = 6; i > 0; i--) | |
2557 | nop(); | |
2558 | ||
2559 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, continue); | |
77accbf5 | 2560 | local_irq_restore(flags); |
1da177e4 LT |
2561 | return; |
2562 | } | |
2563 | /* Normal char-by-char interrupt */ | |
2564 | if (info->xmit.head == info->xmit.tail | |
a88487c7 TI |
2565 | || info->port.tty->stopped |
2566 | || info->port.tty->hw_stopped) { | |
2567 | DFLOW(DEBUG_LOG(info->line, "tx_int: stopped %i\n", | |
2568 | info->port.tty->stopped)); | |
1da177e4 LT |
2569 | e100_disable_serial_tx_ready_irq(info); |
2570 | info->tr_running = 0; | |
2571 | return; | |
2572 | } | |
2573 | DINTR2(DEBUG_LOG(info->line, "tx_int %c\n", info->xmit.buf[info->xmit.tail])); | |
2574 | /* Send a byte, rs485 timing is critical so turn of ints */ | |
77accbf5 | 2575 | local_irq_save(flags); |
d7283353 | 2576 | info->ioport[REG_TR_DATA] = info->xmit.buf[info->xmit.tail]; |
1da177e4 LT |
2577 | info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1); |
2578 | info->icount.tx++; | |
2579 | if (info->xmit.head == info->xmit.tail) { | |
2580 | #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER) | |
2581 | if (info->rs485.enabled) { | |
2582 | /* Set a short timer to toggle RTS */ | |
2583 | start_one_shot_timer(&fast_timers_rs485[info->line], | |
2584 | rs485_toggle_rts_timer_function, | |
2585 | (unsigned long)info, | |
2586 | info->char_time_usec*2, | |
2587 | "RS-485"); | |
2588 | } | |
2589 | #endif /* RS485 */ | |
2590 | info->last_tx_active_usec = GET_JIFFIES_USEC(); | |
2591 | info->last_tx_active = jiffies; | |
2592 | e100_disable_serial_tx_ready_irq(info); | |
2593 | info->tr_running = 0; | |
2594 | DFLOW(DEBUG_LOG(info->line, "tx_int: stop2\n", 0)); | |
2595 | } else { | |
2596 | /* We must enable since it is disabled in ser_interrupt */ | |
2597 | e100_enable_serial_tx_ready_irq(info); | |
2598 | } | |
77accbf5 | 2599 | local_irq_restore(flags); |
1da177e4 LT |
2600 | |
2601 | if (CIRC_CNT(info->xmit.head, | |
2602 | info->xmit.tail, | |
2603 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) | |
2604 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); | |
2605 | ||
2606 | } /* handle_ser_tx_interrupt */ | |
2607 | ||
2608 | /* result of time measurements: | |
2609 | * RX duration 54-60 us when doing something, otherwise 6-9 us | |
2610 | * ser_int duration: just sending: 8-15 us normally, up to 73 us | |
2611 | */ | |
2612 | static irqreturn_t | |
7d12e780 | 2613 | ser_interrupt(int irq, void *dev_id) |
1da177e4 LT |
2614 | { |
2615 | static volatile int tx_started = 0; | |
2616 | struct e100_serial *info; | |
2617 | int i; | |
2618 | unsigned long flags; | |
2619 | unsigned long irq_mask1_rd; | |
2620 | unsigned long data_mask = (1 << (8+2*0)); /* ser0 data_avail */ | |
2621 | int handled = 0; | |
2622 | static volatile unsigned long reentered_ready_mask = 0; | |
2623 | ||
77accbf5 | 2624 | local_irq_save(flags); |
1da177e4 LT |
2625 | irq_mask1_rd = *R_IRQ_MASK1_RD; |
2626 | /* First handle all rx interrupts with ints disabled */ | |
2627 | info = rs_table; | |
2628 | irq_mask1_rd &= e100_ser_int_mask; | |
2629 | for (i = 0; i < NR_PORTS; i++) { | |
2630 | /* Which line caused the data irq? */ | |
2631 | if (irq_mask1_rd & data_mask) { | |
2632 | handled = 1; | |
2633 | handle_ser_rx_interrupt(info); | |
2634 | } | |
2635 | info += 1; | |
2636 | data_mask <<= 2; | |
2637 | } | |
2638 | /* Handle tx interrupts with interrupts enabled so we | |
2639 | * can take care of new data interrupts while transmitting | |
2640 | * We protect the tx part with the tx_started flag. | |
2641 | * We disable the tr_ready interrupts we are about to handle and | |
2642 | * unblock the serial interrupt so new serial interrupts may come. | |
2643 | * | |
2644 | * If we get a new interrupt: | |
2645 | * - it migth be due to synchronous serial ports. | |
2646 | * - serial irq will be blocked by general irq handler. | |
2647 | * - async data will be handled above (sync will be ignored). | |
2648 | * - tx_started flag will prevent us from trying to send again and | |
2649 | * we will exit fast - no need to unblock serial irq. | |
2650 | * - Next (sync) serial interrupt handler will be runned with | |
2651 | * disabled interrupt due to restore_flags() at end of function, | |
2652 | * so sync handler will not be preempted or reentered. | |
2653 | */ | |
2654 | if (!tx_started) { | |
2655 | unsigned long ready_mask; | |
2656 | unsigned long | |
2657 | tx_started = 1; | |
2658 | /* Only the tr_ready interrupts left */ | |
2659 | irq_mask1_rd &= (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) | | |
2660 | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) | | |
2661 | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) | | |
2662 | IO_MASK(R_IRQ_MASK1_RD, ser3_ready)); | |
2663 | while (irq_mask1_rd) { | |
2664 | /* Disable those we are about to handle */ | |
2665 | *R_IRQ_MASK1_CLR = irq_mask1_rd; | |
2666 | /* Unblock the serial interrupt */ | |
2667 | *R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set); | |
2668 | ||
77accbf5 | 2669 | local_irq_enable(); |
1da177e4 LT |
2670 | ready_mask = (1 << (8+1+2*0)); /* ser0 tr_ready */ |
2671 | info = rs_table; | |
2672 | for (i = 0; i < NR_PORTS; i++) { | |
2673 | /* Which line caused the ready irq? */ | |
2674 | if (irq_mask1_rd & ready_mask) { | |
2675 | handled = 1; | |
2676 | handle_ser_tx_interrupt(info); | |
2677 | } | |
2678 | info += 1; | |
2679 | ready_mask <<= 2; | |
2680 | } | |
2681 | /* handle_ser_tx_interrupt enables tr_ready interrupts */ | |
77accbf5 | 2682 | local_irq_disable(); |
1da177e4 LT |
2683 | /* Handle reentered TX interrupt */ |
2684 | irq_mask1_rd = reentered_ready_mask; | |
2685 | } | |
77accbf5 | 2686 | local_irq_disable(); |
1da177e4 LT |
2687 | tx_started = 0; |
2688 | } else { | |
2689 | unsigned long ready_mask; | |
2690 | ready_mask = irq_mask1_rd & (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) | | |
2691 | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) | | |
2692 | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) | | |
2693 | IO_MASK(R_IRQ_MASK1_RD, ser3_ready)); | |
2694 | if (ready_mask) { | |
2695 | reentered_ready_mask |= ready_mask; | |
2696 | /* Disable those we are about to handle */ | |
2697 | *R_IRQ_MASK1_CLR = ready_mask; | |
2698 | DFLOW(DEBUG_LOG(SERIAL_DEBUG_LINE, "ser_int reentered with TX %X\n", ready_mask)); | |
2699 | } | |
2700 | } | |
2701 | ||
77accbf5 | 2702 | local_irq_restore(flags); |
1da177e4 LT |
2703 | return IRQ_RETVAL(handled); |
2704 | } /* ser_interrupt */ | |
2705 | #endif | |
2706 | ||
2707 | /* | |
2708 | * ------------------------------------------------------------------- | |
2709 | * Here ends the serial interrupt routines. | |
2710 | * ------------------------------------------------------------------- | |
2711 | */ | |
2712 | ||
2713 | /* | |
2714 | * This routine is used to handle the "bottom half" processing for the | |
2715 | * serial driver, known also the "software interrupt" processing. | |
2716 | * This processing is done at the kernel interrupt level, after the | |
2717 | * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This | |
2718 | * is where time-consuming activities which can not be done in the | |
2719 | * interrupt driver proper are done; the interrupt driver schedules | |
2720 | * them using rs_sched_event(), and they get done here. | |
2721 | */ | |
2722 | static void | |
77accbf5 | 2723 | do_softint(struct work_struct *work) |
1da177e4 | 2724 | { |
77accbf5 | 2725 | struct e100_serial *info; |
1da177e4 LT |
2726 | struct tty_struct *tty; |
2727 | ||
77accbf5 JN |
2728 | info = container_of(work, struct e100_serial, work); |
2729 | ||
a88487c7 | 2730 | tty = info->port.tty; |
1da177e4 LT |
2731 | if (!tty) |
2732 | return; | |
2733 | ||
b963a844 JS |
2734 | if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) |
2735 | tty_wakeup(tty); | |
1da177e4 LT |
2736 | } |
2737 | ||
2738 | static int | |
2739 | startup(struct e100_serial * info) | |
2740 | { | |
2741 | unsigned long flags; | |
2742 | unsigned long xmit_page; | |
2743 | int i; | |
2744 | ||
2745 | xmit_page = get_zeroed_page(GFP_KERNEL); | |
2746 | if (!xmit_page) | |
2747 | return -ENOMEM; | |
2748 | ||
77accbf5 | 2749 | local_irq_save(flags); |
1da177e4 LT |
2750 | |
2751 | /* if it was already initialized, skip this */ | |
2752 | ||
2753 | if (info->flags & ASYNC_INITIALIZED) { | |
77accbf5 | 2754 | local_irq_restore(flags); |
1da177e4 LT |
2755 | free_page(xmit_page); |
2756 | return 0; | |
2757 | } | |
2758 | ||
2759 | if (info->xmit.buf) | |
2760 | free_page(xmit_page); | |
2761 | else | |
2762 | info->xmit.buf = (unsigned char *) xmit_page; | |
2763 | ||
2764 | #ifdef SERIAL_DEBUG_OPEN | |
2765 | printk("starting up ttyS%d (xmit_buf 0x%p)...\n", info->line, info->xmit.buf); | |
2766 | #endif | |
2767 | ||
2768 | #ifdef CONFIG_SVINTO_SIM | |
2769 | /* Bits and pieces collected from below. Better to have them | |
2770 | in one ifdef:ed clause than to mix in a lot of ifdefs, | |
2771 | right? */ | |
a88487c7 TI |
2772 | if (info->port.tty) |
2773 | clear_bit(TTY_IO_ERROR, &info->port.tty->flags); | |
1da177e4 LT |
2774 | |
2775 | info->xmit.head = info->xmit.tail = 0; | |
2776 | info->first_recv_buffer = info->last_recv_buffer = NULL; | |
2777 | info->recv_cnt = info->max_recv_cnt = 0; | |
2778 | ||
2779 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) | |
2780 | info->rec_descr[i].buf = NULL; | |
2781 | ||
2782 | /* No real action in the simulator, but may set info important | |
2783 | to ioctl. */ | |
2784 | change_speed(info); | |
2785 | #else | |
2786 | ||
2787 | /* | |
2788 | * Clear the FIFO buffers and disable them | |
2789 | * (they will be reenabled in change_speed()) | |
2790 | */ | |
2791 | ||
2792 | /* | |
2793 | * Reset the DMA channels and make sure their interrupts are cleared | |
2794 | */ | |
2795 | ||
2796 | if (info->dma_in_enabled) { | |
2797 | info->uses_dma_in = 1; | |
2798 | e100_enable_rxdma_channel(info); | |
2799 | ||
2800 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); | |
2801 | ||
2802 | /* Wait until reset cycle is complete */ | |
2803 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) == | |
2804 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); | |
2805 | ||
2806 | /* Make sure the irqs are cleared */ | |
2807 | *info->iclrintradr = | |
2808 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | | |
2809 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); | |
2810 | } else { | |
2811 | e100_disable_rxdma_channel(info); | |
2812 | } | |
2813 | ||
2814 | if (info->dma_out_enabled) { | |
2815 | info->uses_dma_out = 1; | |
2816 | e100_enable_txdma_channel(info); | |
2817 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); | |
2818 | ||
2819 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) == | |
2820 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); | |
2821 | ||
2822 | /* Make sure the irqs are cleared */ | |
2823 | *info->oclrintradr = | |
2824 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | | |
2825 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); | |
2826 | } else { | |
2827 | e100_disable_txdma_channel(info); | |
2828 | } | |
2829 | ||
a88487c7 TI |
2830 | if (info->port.tty) |
2831 | clear_bit(TTY_IO_ERROR, &info->port.tty->flags); | |
1da177e4 LT |
2832 | |
2833 | info->xmit.head = info->xmit.tail = 0; | |
2834 | info->first_recv_buffer = info->last_recv_buffer = NULL; | |
2835 | info->recv_cnt = info->max_recv_cnt = 0; | |
2836 | ||
2837 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) | |
2838 | info->rec_descr[i].buf = 0; | |
2839 | ||
2840 | /* | |
2841 | * and set the speed and other flags of the serial port | |
2842 | * this will start the rx/tx as well | |
2843 | */ | |
2844 | #ifdef SERIAL_HANDLE_EARLY_ERRORS | |
2845 | e100_enable_serial_data_irq(info); | |
2846 | #endif | |
2847 | change_speed(info); | |
2848 | ||
2849 | /* dummy read to reset any serial errors */ | |
2850 | ||
d7283353 | 2851 | (void)info->ioport[REG_DATA]; |
1da177e4 LT |
2852 | |
2853 | /* enable the interrupts */ | |
2854 | if (info->uses_dma_out) | |
2855 | e100_enable_txdma_irq(info); | |
2856 | ||
2857 | e100_enable_rx_irq(info); | |
2858 | ||
2859 | info->tr_running = 0; /* to be sure we don't lock up the transmitter */ | |
2860 | ||
2861 | /* setup the dma input descriptor and start dma */ | |
2862 | ||
2863 | start_receive(info); | |
2864 | ||
2865 | /* for safety, make sure the descriptors last result is 0 bytes written */ | |
2866 | ||
2867 | info->tr_descr.sw_len = 0; | |
2868 | info->tr_descr.hw_len = 0; | |
2869 | info->tr_descr.status = 0; | |
2870 | ||
2871 | /* enable RTS/DTR last */ | |
2872 | ||
2873 | e100_rts(info, 1); | |
2874 | e100_dtr(info, 1); | |
2875 | ||
2876 | #endif /* CONFIG_SVINTO_SIM */ | |
2877 | ||
2878 | info->flags |= ASYNC_INITIALIZED; | |
2879 | ||
77accbf5 | 2880 | local_irq_restore(flags); |
1da177e4 LT |
2881 | return 0; |
2882 | } | |
2883 | ||
2884 | /* | |
2885 | * This routine will shutdown a serial port; interrupts are disabled, and | |
2886 | * DTR is dropped if the hangup on close termio flag is on. | |
2887 | */ | |
2888 | static void | |
2889 | shutdown(struct e100_serial * info) | |
2890 | { | |
2891 | unsigned long flags; | |
2892 | struct etrax_dma_descr *descr = info->rec_descr; | |
2893 | struct etrax_recv_buffer *buffer; | |
2894 | int i; | |
2895 | ||
2896 | #ifndef CONFIG_SVINTO_SIM | |
2897 | /* shut down the transmitter and receiver */ | |
2898 | DFLOW(DEBUG_LOG(info->line, "shutdown %i\n", info->line)); | |
2899 | e100_disable_rx(info); | |
d7283353 | 2900 | info->ioport[REG_TR_CTRL] = (info->tx_ctrl &= ~0x40); |
1da177e4 LT |
2901 | |
2902 | /* disable interrupts, reset dma channels */ | |
2903 | if (info->uses_dma_in) { | |
2904 | e100_disable_rxdma_irq(info); | |
2905 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); | |
2906 | info->uses_dma_in = 0; | |
2907 | } else { | |
2908 | e100_disable_serial_data_irq(info); | |
2909 | } | |
2910 | ||
2911 | if (info->uses_dma_out) { | |
2912 | e100_disable_txdma_irq(info); | |
2913 | info->tr_running = 0; | |
2914 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); | |
2915 | info->uses_dma_out = 0; | |
2916 | } else { | |
2917 | e100_disable_serial_tx_ready_irq(info); | |
2918 | info->tr_running = 0; | |
2919 | } | |
2920 | ||
2921 | #endif /* CONFIG_SVINTO_SIM */ | |
2922 | ||
2923 | if (!(info->flags & ASYNC_INITIALIZED)) | |
2924 | return; | |
2925 | ||
2926 | #ifdef SERIAL_DEBUG_OPEN | |
2927 | printk("Shutting down serial port %d (irq %d)....\n", info->line, | |
2928 | info->irq); | |
2929 | #endif | |
2930 | ||
77accbf5 | 2931 | local_irq_save(flags); |
1da177e4 LT |
2932 | |
2933 | if (info->xmit.buf) { | |
2934 | free_page((unsigned long)info->xmit.buf); | |
2935 | info->xmit.buf = NULL; | |
2936 | } | |
2937 | ||
2938 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) | |
2939 | if (descr[i].buf) { | |
2940 | buffer = phys_to_virt(descr[i].buf) - sizeof *buffer; | |
2941 | kfree(buffer); | |
2942 | descr[i].buf = 0; | |
2943 | } | |
2944 | ||
a88487c7 | 2945 | if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL)) { |
1da177e4 LT |
2946 | /* hang up DTR and RTS if HUPCL is enabled */ |
2947 | e100_dtr(info, 0); | |
2948 | e100_rts(info, 0); /* could check CRTSCTS before doing this */ | |
2949 | } | |
2950 | ||
a88487c7 TI |
2951 | if (info->port.tty) |
2952 | set_bit(TTY_IO_ERROR, &info->port.tty->flags); | |
1da177e4 LT |
2953 | |
2954 | info->flags &= ~ASYNC_INITIALIZED; | |
77accbf5 | 2955 | local_irq_restore(flags); |
1da177e4 LT |
2956 | } |
2957 | ||
2958 | ||
2959 | /* change baud rate and other assorted parameters */ | |
2960 | ||
2961 | static void | |
2962 | change_speed(struct e100_serial *info) | |
2963 | { | |
2964 | unsigned int cflag; | |
2965 | unsigned long xoff; | |
2966 | unsigned long flags; | |
2967 | /* first some safety checks */ | |
2968 | ||
a88487c7 | 2969 | if (!info->port.tty || !info->port.tty->termios) |
1da177e4 | 2970 | return; |
d7283353 | 2971 | if (!info->ioport) |
1da177e4 LT |
2972 | return; |
2973 | ||
a88487c7 | 2974 | cflag = info->port.tty->termios->c_cflag; |
1da177e4 LT |
2975 | |
2976 | /* possibly, the tx/rx should be disabled first to do this safely */ | |
2977 | ||
2978 | /* change baud-rate and write it to the hardware */ | |
2979 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) { | |
2980 | /* Special baudrate */ | |
2981 | u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */ | |
2982 | unsigned long alt_source = | |
2983 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) | | |
2984 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal); | |
2985 | /* R_ALT_SER_BAUDRATE selects the source */ | |
2986 | DBAUD(printk("Custom baudrate: baud_base/divisor %lu/%i\n", | |
2987 | (unsigned long)info->baud_base, info->custom_divisor)); | |
2988 | if (info->baud_base == SERIAL_PRESCALE_BASE) { | |
2989 | /* 0, 2-65535 (0=65536) */ | |
2990 | u16 divisor = info->custom_divisor; | |
2991 | /* R_SERIAL_PRESCALE (upper 16 bits of R_CLOCK_PRESCALE) */ | |
2992 | /* baudrate is 3.125MHz/custom_divisor */ | |
2993 | alt_source = | |
2994 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, prescale) | | |
2995 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, prescale); | |
2996 | alt_source = 0x11; | |
2997 | DBAUD(printk("Writing SERIAL_PRESCALE: divisor %i\n", divisor)); | |
2998 | *R_SERIAL_PRESCALE = divisor; | |
2999 | info->baud = SERIAL_PRESCALE_BASE/divisor; | |
3000 | } | |
3001 | #ifdef CONFIG_ETRAX_EXTERN_PB6CLK_ENABLED | |
3002 | else if ((info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8 && | |
3003 | info->custom_divisor == 1) || | |
3004 | (info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ && | |
3005 | info->custom_divisor == 8)) { | |
3006 | /* ext_clk selected */ | |
3007 | alt_source = | |
3008 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, extern) | | |
3009 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, extern); | |
3010 | DBAUD(printk("using external baudrate: %lu\n", CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8)); | |
3011 | info->baud = CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8; | |
3012 | } | |
1da177e4 LT |
3013 | #endif |
3014 | else | |
3015 | { | |
3016 | /* Bad baudbase, we don't support using timer0 | |
3017 | * for baudrate. | |
3018 | */ | |
3019 | printk(KERN_WARNING "Bad baud_base/custom_divisor: %lu/%i\n", | |
3020 | (unsigned long)info->baud_base, info->custom_divisor); | |
3021 | } | |
3022 | r_alt_ser_baudrate_shadow &= ~mask; | |
3023 | r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8)); | |
3024 | *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow; | |
3025 | } else { | |
3026 | /* Normal baudrate */ | |
3027 | /* Make sure we use normal baudrate */ | |
3028 | u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */ | |
3029 | unsigned long alt_source = | |
3030 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) | | |
3031 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal); | |
3032 | r_alt_ser_baudrate_shadow &= ~mask; | |
3033 | r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8)); | |
3034 | #ifndef CONFIG_SVINTO_SIM | |
3035 | *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow; | |
3036 | #endif /* CONFIG_SVINTO_SIM */ | |
3037 | ||
3038 | info->baud = cflag_to_baud(cflag); | |
3039 | #ifndef CONFIG_SVINTO_SIM | |
d7283353 | 3040 | info->ioport[REG_BAUD] = cflag_to_etrax_baud(cflag); |
1da177e4 LT |
3041 | #endif /* CONFIG_SVINTO_SIM */ |
3042 | } | |
3043 | ||
3044 | #ifndef CONFIG_SVINTO_SIM | |
3045 | /* start with default settings and then fill in changes */ | |
77accbf5 | 3046 | local_irq_save(flags); |
1da177e4 LT |
3047 | /* 8 bit, no/even parity */ |
3048 | info->rx_ctrl &= ~(IO_MASK(R_SERIAL0_REC_CTRL, rec_bitnr) | | |
3049 | IO_MASK(R_SERIAL0_REC_CTRL, rec_par_en) | | |
3050 | IO_MASK(R_SERIAL0_REC_CTRL, rec_par)); | |
3051 | ||
3052 | /* 8 bit, no/even parity, 1 stop bit, no cts */ | |
3053 | info->tx_ctrl &= ~(IO_MASK(R_SERIAL0_TR_CTRL, tr_bitnr) | | |
3054 | IO_MASK(R_SERIAL0_TR_CTRL, tr_par_en) | | |
3055 | IO_MASK(R_SERIAL0_TR_CTRL, tr_par) | | |
3056 | IO_MASK(R_SERIAL0_TR_CTRL, stop_bits) | | |
3057 | IO_MASK(R_SERIAL0_TR_CTRL, auto_cts)); | |
3058 | ||
3059 | if ((cflag & CSIZE) == CS7) { | |
3060 | /* set 7 bit mode */ | |
3061 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit); | |
3062 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit); | |
3063 | } | |
3064 | ||
3065 | if (cflag & CSTOPB) { | |
3066 | /* set 2 stop bit mode */ | |
3067 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, two_bits); | |
3068 | } | |
3069 | ||
3070 | if (cflag & PARENB) { | |
3071 | /* enable parity */ | |
3072 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable); | |
3073 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable); | |
3074 | } | |
3075 | ||
3076 | if (cflag & CMSPAR) { | |
3077 | /* enable stick parity, PARODD mean Mark which matches ETRAX */ | |
3078 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, stick); | |
3079 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, stick); | |
3080 | } | |
3081 | if (cflag & PARODD) { | |
3082 | /* set odd parity (or Mark if CMSPAR) */ | |
3083 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd); | |
3084 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd); | |
3085 | } | |
3086 | ||
3087 | if (cflag & CRTSCTS) { | |
3088 | /* enable automatic CTS handling */ | |
3089 | DFLOW(DEBUG_LOG(info->line, "FLOW auto_cts enabled\n", 0)); | |
3090 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, active); | |
3091 | } | |
3092 | ||
3093 | /* make sure the tx and rx are enabled */ | |
3094 | ||
3095 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable); | |
3096 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable); | |
3097 | ||
3098 | /* actually write the control regs to the hardware */ | |
3099 | ||
d7283353 AC |
3100 | info->ioport[REG_TR_CTRL] = info->tx_ctrl; |
3101 | info->ioport[REG_REC_CTRL] = info->rx_ctrl; | |
a88487c7 | 3102 | xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(info->port.tty)); |
1da177e4 | 3103 | xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable); |
a88487c7 TI |
3104 | if (info->port.tty->termios->c_iflag & IXON ) { |
3105 | DFLOW(DEBUG_LOG(info->line, "FLOW XOFF enabled 0x%02X\n", | |
3106 | STOP_CHAR(info->port.tty))); | |
1da177e4 LT |
3107 | xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); |
3108 | } | |
3109 | ||
d7283353 | 3110 | *((unsigned long *)&info->ioport[REG_XOFF]) = xoff; |
77accbf5 | 3111 | local_irq_restore(flags); |
1da177e4 LT |
3112 | #endif /* !CONFIG_SVINTO_SIM */ |
3113 | ||
3114 | update_char_time(info); | |
3115 | ||
3116 | } /* change_speed */ | |
3117 | ||
3118 | /* start transmitting chars NOW */ | |
3119 | ||
3120 | static void | |
3121 | rs_flush_chars(struct tty_struct *tty) | |
3122 | { | |
3123 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3124 | unsigned long flags; | |
3125 | ||
3126 | if (info->tr_running || | |
3127 | info->xmit.head == info->xmit.tail || | |
3128 | tty->stopped || | |
3129 | tty->hw_stopped || | |
3130 | !info->xmit.buf) | |
3131 | return; | |
3132 | ||
3133 | #ifdef SERIAL_DEBUG_FLOW | |
3134 | printk("rs_flush_chars\n"); | |
3135 | #endif | |
3136 | ||
3137 | /* this protection might not exactly be necessary here */ | |
3138 | ||
77accbf5 | 3139 | local_irq_save(flags); |
1da177e4 | 3140 | start_transmit(info); |
77accbf5 | 3141 | local_irq_restore(flags); |
1da177e4 LT |
3142 | } |
3143 | ||
77accbf5 | 3144 | static int rs_raw_write(struct tty_struct *tty, |
41c28ff1 | 3145 | const unsigned char *buf, int count) |
1da177e4 LT |
3146 | { |
3147 | int c, ret = 0; | |
3148 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3149 | unsigned long flags; | |
3150 | ||
3151 | /* first some sanity checks */ | |
3152 | ||
3153 | if (!tty || !info->xmit.buf || !tmp_buf) | |
3154 | return 0; | |
3155 | ||
3156 | #ifdef SERIAL_DEBUG_DATA | |
3157 | if (info->line == SERIAL_DEBUG_LINE) | |
3158 | printk("rs_raw_write (%d), status %d\n", | |
d7283353 | 3159 | count, info->ioport[REG_STATUS]); |
1da177e4 LT |
3160 | #endif |
3161 | ||
3162 | #ifdef CONFIG_SVINTO_SIM | |
3163 | /* Really simple. The output is here and now. */ | |
3164 | SIMCOUT(buf, count); | |
3165 | return count; | |
3166 | #endif | |
77accbf5 | 3167 | local_save_flags(flags); |
1da177e4 LT |
3168 | DFLOW(DEBUG_LOG(info->line, "write count %i ", count)); |
3169 | DFLOW(DEBUG_LOG(info->line, "ldisc %i\n", tty->ldisc.chars_in_buffer(tty))); | |
3170 | ||
3171 | ||
77accbf5 JN |
3172 | /* The local_irq_disable/restore_flags pairs below are needed |
3173 | * because the DMA interrupt handler moves the info->xmit values. | |
3174 | * the memcpy needs to be in the critical region unfortunately, | |
3175 | * because we need to read xmit values, memcpy, write xmit values | |
3176 | * in one atomic operation... this could perhaps be avoided by | |
3177 | * more clever design. | |
1da177e4 | 3178 | */ |
77accbf5 | 3179 | local_irq_disable(); |
1da177e4 LT |
3180 | while (count) { |
3181 | c = CIRC_SPACE_TO_END(info->xmit.head, | |
3182 | info->xmit.tail, | |
3183 | SERIAL_XMIT_SIZE); | |
3184 | ||
3185 | if (count < c) | |
3186 | c = count; | |
3187 | if (c <= 0) | |
3188 | break; | |
3189 | ||
3190 | memcpy(info->xmit.buf + info->xmit.head, buf, c); | |
3191 | info->xmit.head = (info->xmit.head + c) & | |
3192 | (SERIAL_XMIT_SIZE-1); | |
3193 | buf += c; | |
3194 | count -= c; | |
3195 | ret += c; | |
3196 | } | |
77accbf5 | 3197 | local_irq_restore(flags); |
1da177e4 LT |
3198 | |
3199 | /* enable transmitter if not running, unless the tty is stopped | |
3200 | * this does not need IRQ protection since if tr_running == 0 | |
3201 | * the IRQ's are not running anyway for this port. | |
3202 | */ | |
3203 | DFLOW(DEBUG_LOG(info->line, "write ret %i\n", ret)); | |
3204 | ||
3205 | if (info->xmit.head != info->xmit.tail && | |
3206 | !tty->stopped && | |
3207 | !tty->hw_stopped && | |
3208 | !info->tr_running) { | |
3209 | start_transmit(info); | |
3210 | } | |
3211 | ||
3212 | return ret; | |
3213 | } /* raw_raw_write() */ | |
3214 | ||
3215 | static int | |
77accbf5 | 3216 | rs_write(struct tty_struct *tty, |
1da177e4 LT |
3217 | const unsigned char *buf, int count) |
3218 | { | |
3219 | #if defined(CONFIG_ETRAX_RS485) | |
3220 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3221 | ||
3222 | if (info->rs485.enabled) | |
3223 | { | |
3224 | /* If we are in RS-485 mode, we need to toggle RTS and disable | |
3225 | * the receiver before initiating a DMA transfer | |
3226 | */ | |
3227 | #ifdef CONFIG_ETRAX_FAST_TIMER | |
3228 | /* Abort any started timer */ | |
3229 | fast_timers_rs485[info->line].function = NULL; | |
3230 | del_fast_timer(&fast_timers_rs485[info->line]); | |
3231 | #endif | |
3232 | e100_rts(info, info->rs485.rts_on_send); | |
3233 | #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) | |
3234 | e100_disable_rx(info); | |
3235 | e100_enable_rx_irq(info); | |
3236 | #endif | |
3237 | ||
3238 | if (info->rs485.delay_rts_before_send > 0) | |
3239 | msleep(info->rs485.delay_rts_before_send); | |
3240 | } | |
3241 | #endif /* CONFIG_ETRAX_RS485 */ | |
3242 | ||
77accbf5 | 3243 | count = rs_raw_write(tty, buf, count); |
1da177e4 LT |
3244 | |
3245 | #if defined(CONFIG_ETRAX_RS485) | |
3246 | if (info->rs485.enabled) | |
3247 | { | |
3248 | unsigned int val; | |
3249 | /* If we are in RS-485 mode the following has to be done: | |
3250 | * wait until DMA is ready | |
3251 | * wait on transmit shift register | |
3252 | * toggle RTS | |
3253 | * enable the receiver | |
3254 | */ | |
3255 | ||
3256 | /* Sleep until all sent */ | |
3257 | tty_wait_until_sent(tty, 0); | |
3258 | #ifdef CONFIG_ETRAX_FAST_TIMER | |
3259 | /* Now sleep a little more so that shift register is empty */ | |
3260 | schedule_usleep(info->char_time_usec * 2); | |
3261 | #endif | |
3262 | /* wait on transmit shift register */ | |
3263 | do{ | |
3264 | get_lsr_info(info, &val); | |
3265 | }while (!(val & TIOCSER_TEMT)); | |
3266 | ||
3267 | e100_rts(info, info->rs485.rts_after_sent); | |
3268 | ||
3269 | #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) | |
3270 | e100_enable_rx(info); | |
3271 | e100_enable_rxdma_irq(info); | |
3272 | #endif | |
3273 | } | |
3274 | #endif /* CONFIG_ETRAX_RS485 */ | |
3275 | ||
3276 | return count; | |
3277 | } /* rs_write */ | |
3278 | ||
3279 | ||
3280 | /* how much space is available in the xmit buffer? */ | |
3281 | ||
3282 | static int | |
3283 | rs_write_room(struct tty_struct *tty) | |
3284 | { | |
3285 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3286 | ||
3287 | return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
3288 | } | |
3289 | ||
3290 | /* How many chars are in the xmit buffer? | |
3291 | * This does not include any chars in the transmitter FIFO. | |
3292 | * Use wait_until_sent for waiting for FIFO drain. | |
3293 | */ | |
3294 | ||
3295 | static int | |
3296 | rs_chars_in_buffer(struct tty_struct *tty) | |
3297 | { | |
3298 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3299 | ||
3300 | return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
3301 | } | |
3302 | ||
3303 | /* discard everything in the xmit buffer */ | |
3304 | ||
3305 | static void | |
3306 | rs_flush_buffer(struct tty_struct *tty) | |
3307 | { | |
3308 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3309 | unsigned long flags; | |
3310 | ||
77accbf5 | 3311 | local_irq_save(flags); |
1da177e4 | 3312 | info->xmit.head = info->xmit.tail = 0; |
77accbf5 | 3313 | local_irq_restore(flags); |
1da177e4 | 3314 | |
b963a844 | 3315 | tty_wakeup(tty); |
1da177e4 LT |
3316 | } |
3317 | ||
3318 | /* | |
3319 | * This function is used to send a high-priority XON/XOFF character to | |
3320 | * the device | |
3321 | * | |
3322 | * Since we use DMA we don't check for info->x_char in transmit_chars_dma(), | |
3323 | * but we do it in handle_ser_tx_interrupt(). | |
3324 | * We disable DMA channel and enable tx ready interrupt and write the | |
3325 | * character when possible. | |
3326 | */ | |
3327 | static void rs_send_xchar(struct tty_struct *tty, char ch) | |
3328 | { | |
3329 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3330 | unsigned long flags; | |
77accbf5 | 3331 | local_irq_save(flags); |
1da177e4 LT |
3332 | if (info->uses_dma_out) { |
3333 | /* Put the DMA on hold and disable the channel */ | |
3334 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, hold); | |
3335 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) != | |
3336 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, hold)); | |
3337 | e100_disable_txdma_channel(info); | |
3338 | } | |
3339 | ||
3340 | /* Must make sure transmitter is not stopped before we can transmit */ | |
3341 | if (tty->stopped) | |
3342 | rs_start(tty); | |
3343 | ||
3344 | /* Enable manual transmit interrupt and send from there */ | |
3345 | DFLOW(DEBUG_LOG(info->line, "rs_send_xchar 0x%02X\n", ch)); | |
3346 | info->x_char = ch; | |
3347 | e100_enable_serial_tx_ready_irq(info); | |
77accbf5 | 3348 | local_irq_restore(flags); |
1da177e4 LT |
3349 | } |
3350 | ||
3351 | /* | |
3352 | * ------------------------------------------------------------ | |
3353 | * rs_throttle() | |
3354 | * | |
3355 | * This routine is called by the upper-layer tty layer to signal that | |
3356 | * incoming characters should be throttled. | |
3357 | * ------------------------------------------------------------ | |
3358 | */ | |
3359 | static void | |
3360 | rs_throttle(struct tty_struct * tty) | |
3361 | { | |
3362 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3363 | #ifdef SERIAL_DEBUG_THROTTLE | |
3364 | char buf[64]; | |
3365 | ||
3366 | printk("throttle %s: %lu....\n", tty_name(tty, buf), | |
3367 | (unsigned long)tty->ldisc.chars_in_buffer(tty)); | |
3368 | #endif | |
3369 | DFLOW(DEBUG_LOG(info->line,"rs_throttle %lu\n", tty->ldisc.chars_in_buffer(tty))); | |
3370 | ||
3371 | /* Do RTS before XOFF since XOFF might take some time */ | |
3372 | if (tty->termios->c_cflag & CRTSCTS) { | |
3373 | /* Turn off RTS line */ | |
3374 | e100_rts(info, 0); | |
3375 | } | |
3376 | if (I_IXOFF(tty)) | |
3377 | rs_send_xchar(tty, STOP_CHAR(tty)); | |
3378 | ||
3379 | } | |
3380 | ||
3381 | static void | |
3382 | rs_unthrottle(struct tty_struct * tty) | |
3383 | { | |
3384 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3385 | #ifdef SERIAL_DEBUG_THROTTLE | |
3386 | char buf[64]; | |
3387 | ||
3388 | printk("unthrottle %s: %lu....\n", tty_name(tty, buf), | |
3389 | (unsigned long)tty->ldisc.chars_in_buffer(tty)); | |
3390 | #endif | |
3391 | DFLOW(DEBUG_LOG(info->line,"rs_unthrottle ldisc %d\n", tty->ldisc.chars_in_buffer(tty))); | |
3392 | DFLOW(DEBUG_LOG(info->line,"rs_unthrottle flip.count: %i\n", tty->flip.count)); | |
3393 | /* Do RTS before XOFF since XOFF might take some time */ | |
3394 | if (tty->termios->c_cflag & CRTSCTS) { | |
3395 | /* Assert RTS line */ | |
3396 | e100_rts(info, 1); | |
3397 | } | |
3398 | ||
3399 | if (I_IXOFF(tty)) { | |
3400 | if (info->x_char) | |
3401 | info->x_char = 0; | |
3402 | else | |
3403 | rs_send_xchar(tty, START_CHAR(tty)); | |
3404 | } | |
3405 | ||
3406 | } | |
3407 | ||
3408 | /* | |
3409 | * ------------------------------------------------------------ | |
3410 | * rs_ioctl() and friends | |
3411 | * ------------------------------------------------------------ | |
3412 | */ | |
3413 | ||
3414 | static int | |
3415 | get_serial_info(struct e100_serial * info, | |
3416 | struct serial_struct * retinfo) | |
3417 | { | |
3418 | struct serial_struct tmp; | |
3419 | ||
3420 | /* this is all probably wrong, there are a lot of fields | |
3421 | * here that we don't have in e100_serial and maybe we | |
3422 | * should set them to something else than 0. | |
3423 | */ | |
3424 | ||
3425 | if (!retinfo) | |
3426 | return -EFAULT; | |
3427 | memset(&tmp, 0, sizeof(tmp)); | |
3428 | tmp.type = info->type; | |
3429 | tmp.line = info->line; | |
d7283353 | 3430 | tmp.port = (int)info->ioport; |
1da177e4 LT |
3431 | tmp.irq = info->irq; |
3432 | tmp.flags = info->flags; | |
3433 | tmp.baud_base = info->baud_base; | |
3434 | tmp.close_delay = info->close_delay; | |
3435 | tmp.closing_wait = info->closing_wait; | |
3436 | tmp.custom_divisor = info->custom_divisor; | |
3437 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) | |
3438 | return -EFAULT; | |
3439 | return 0; | |
3440 | } | |
3441 | ||
3442 | static int | |
3443 | set_serial_info(struct e100_serial *info, | |
3444 | struct serial_struct *new_info) | |
3445 | { | |
3446 | struct serial_struct new_serial; | |
3447 | struct e100_serial old_info; | |
3448 | int retval = 0; | |
3449 | ||
3450 | if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) | |
3451 | return -EFAULT; | |
3452 | ||
3453 | old_info = *info; | |
3454 | ||
3455 | if (!capable(CAP_SYS_ADMIN)) { | |
3456 | if ((new_serial.type != info->type) || | |
3457 | (new_serial.close_delay != info->close_delay) || | |
3458 | ((new_serial.flags & ~ASYNC_USR_MASK) != | |
3459 | (info->flags & ~ASYNC_USR_MASK))) | |
3460 | return -EPERM; | |
3461 | info->flags = ((info->flags & ~ASYNC_USR_MASK) | | |
3462 | (new_serial.flags & ASYNC_USR_MASK)); | |
3463 | goto check_and_exit; | |
3464 | } | |
3465 | ||
3466 | if (info->count > 1) | |
3467 | return -EBUSY; | |
3468 | ||
3469 | /* | |
3470 | * OK, past this point, all the error checking has been done. | |
3471 | * At this point, we start making changes..... | |
3472 | */ | |
3473 | ||
3474 | info->baud_base = new_serial.baud_base; | |
3475 | info->flags = ((info->flags & ~ASYNC_FLAGS) | | |
3476 | (new_serial.flags & ASYNC_FLAGS)); | |
3477 | info->custom_divisor = new_serial.custom_divisor; | |
3478 | info->type = new_serial.type; | |
3479 | info->close_delay = new_serial.close_delay; | |
3480 | info->closing_wait = new_serial.closing_wait; | |
a88487c7 | 3481 | info->port.tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
3482 | |
3483 | check_and_exit: | |
3484 | if (info->flags & ASYNC_INITIALIZED) { | |
3485 | change_speed(info); | |
3486 | } else | |
3487 | retval = startup(info); | |
3488 | return retval; | |
3489 | } | |
3490 | ||
3491 | /* | |
3492 | * get_lsr_info - get line status register info | |
3493 | * | |
3494 | * Purpose: Let user call ioctl() to get info when the UART physically | |
3495 | * is emptied. On bus types like RS485, the transmitter must | |
3496 | * release the bus after transmitting. This must be done when | |
3497 | * the transmit shift register is empty, not be done when the | |
3498 | * transmit holding register is empty. This functionality | |
3499 | * allows an RS485 driver to be written in user space. | |
3500 | */ | |
3501 | static int | |
3502 | get_lsr_info(struct e100_serial * info, unsigned int *value) | |
3503 | { | |
3504 | unsigned int result = TIOCSER_TEMT; | |
3505 | #ifndef CONFIG_SVINTO_SIM | |
3506 | unsigned long curr_time = jiffies; | |
3507 | unsigned long curr_time_usec = GET_JIFFIES_USEC(); | |
3508 | unsigned long elapsed_usec = | |
3509 | (curr_time - info->last_tx_active) * 1000000/HZ + | |
3510 | curr_time_usec - info->last_tx_active_usec; | |
3511 | ||
3512 | if (info->xmit.head != info->xmit.tail || | |
3513 | elapsed_usec < 2*info->char_time_usec) { | |
3514 | result = 0; | |
3515 | } | |
3516 | #endif | |
3517 | ||
3518 | if (copy_to_user(value, &result, sizeof(int))) | |
3519 | return -EFAULT; | |
3520 | return 0; | |
3521 | } | |
3522 | ||
3523 | #ifdef SERIAL_DEBUG_IO | |
3524 | struct state_str | |
3525 | { | |
3526 | int state; | |
3527 | const char *str; | |
3528 | }; | |
3529 | ||
3530 | const struct state_str control_state_str[] = { | |
3531 | {TIOCM_DTR, "DTR" }, | |
3532 | {TIOCM_RTS, "RTS"}, | |
3533 | {TIOCM_ST, "ST?" }, | |
3534 | {TIOCM_SR, "SR?" }, | |
3535 | {TIOCM_CTS, "CTS" }, | |
3536 | {TIOCM_CD, "CD" }, | |
3537 | {TIOCM_RI, "RI" }, | |
3538 | {TIOCM_DSR, "DSR" }, | |
3539 | {0, NULL } | |
3540 | }; | |
3541 | ||
3542 | char *get_control_state_str(int MLines, char *s) | |
3543 | { | |
3544 | int i = 0; | |
3545 | ||
3546 | s[0]='\0'; | |
3547 | while (control_state_str[i].str != NULL) { | |
3548 | if (MLines & control_state_str[i].state) { | |
3549 | if (s[0] != '\0') { | |
3550 | strcat(s, ", "); | |
3551 | } | |
3552 | strcat(s, control_state_str[i].str); | |
3553 | } | |
3554 | i++; | |
3555 | } | |
3556 | return s; | |
3557 | } | |
3558 | #endif | |
3559 | ||
d7283353 | 3560 | static int |
77accbf5 JN |
3561 | rs_break(struct tty_struct *tty, int break_state) |
3562 | { | |
3563 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3564 | unsigned long flags; | |
3565 | ||
d7283353 AC |
3566 | if (!info->ioport) |
3567 | return -EIO; | |
77accbf5 JN |
3568 | |
3569 | local_irq_save(flags); | |
3570 | if (break_state == -1) { | |
3571 | /* Go to manual mode and set the txd pin to 0 */ | |
3572 | /* Clear bit 7 (txd) and 6 (tr_enable) */ | |
3573 | info->tx_ctrl &= 0x3F; | |
3574 | } else { | |
3575 | /* Set bit 7 (txd) and 6 (tr_enable) */ | |
3576 | info->tx_ctrl |= (0x80 | 0x40); | |
3577 | } | |
d7283353 | 3578 | info->ioport[REG_TR_CTRL] = info->tx_ctrl; |
77accbf5 | 3579 | local_irq_restore(flags); |
d7283353 | 3580 | return 0; |
77accbf5 JN |
3581 | } |
3582 | ||
1da177e4 | 3583 | static int |
77accbf5 JN |
3584 | rs_tiocmset(struct tty_struct *tty, struct file *file, |
3585 | unsigned int set, unsigned int clear) | |
1da177e4 | 3586 | { |
77accbf5 | 3587 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
978e595f | 3588 | unsigned long flags; |
1da177e4 | 3589 | |
978e595f | 3590 | local_irq_save(flags); |
032c17e8 | 3591 | |
77accbf5 JN |
3592 | if (clear & TIOCM_RTS) |
3593 | e100_rts(info, 0); | |
3594 | if (clear & TIOCM_DTR) | |
3595 | e100_dtr(info, 0); | |
3596 | /* Handle FEMALE behaviour */ | |
3597 | if (clear & TIOCM_RI) | |
3598 | e100_ri_out(info, 0); | |
3599 | if (clear & TIOCM_CD) | |
3600 | e100_cd_out(info, 0); | |
3601 | ||
3602 | if (set & TIOCM_RTS) | |
3603 | e100_rts(info, 1); | |
3604 | if (set & TIOCM_DTR) | |
3605 | e100_dtr(info, 1); | |
3606 | /* Handle FEMALE behaviour */ | |
3607 | if (set & TIOCM_RI) | |
3608 | e100_ri_out(info, 1); | |
3609 | if (set & TIOCM_CD) | |
3610 | e100_cd_out(info, 1); | |
032c17e8 | 3611 | |
978e595f | 3612 | local_irq_restore(flags); |
77accbf5 JN |
3613 | return 0; |
3614 | } | |
3615 | ||
3616 | static int | |
3617 | rs_tiocmget(struct tty_struct *tty, struct file *file) | |
3618 | { | |
3619 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3620 | unsigned int result; | |
978e595f AC |
3621 | unsigned long flags; |
3622 | ||
3623 | local_irq_save(flags); | |
1da177e4 LT |
3624 | |
3625 | result = | |
3626 | (!E100_RTS_GET(info) ? TIOCM_RTS : 0) | |
3627 | | (!E100_DTR_GET(info) ? TIOCM_DTR : 0) | |
3628 | | (!E100_RI_GET(info) ? TIOCM_RNG : 0) | |
3629 | | (!E100_DSR_GET(info) ? TIOCM_DSR : 0) | |
3630 | | (!E100_CD_GET(info) ? TIOCM_CAR : 0) | |
3631 | | (!E100_CTS_GET(info) ? TIOCM_CTS : 0); | |
3632 | ||
978e595f | 3633 | local_irq_restore(flags); |
032c17e8 | 3634 | |
1da177e4 | 3635 | #ifdef SERIAL_DEBUG_IO |
77accbf5 JN |
3636 | printk(KERN_DEBUG "ser%i: modem state: %i 0x%08X\n", |
3637 | info->line, result, result); | |
1da177e4 LT |
3638 | { |
3639 | char s[100]; | |
3640 | ||
3641 | get_control_state_str(result, s); | |
77accbf5 | 3642 | printk(KERN_DEBUG "state: %s\n", s); |
1da177e4 LT |
3643 | } |
3644 | #endif | |
77accbf5 | 3645 | return result; |
1da177e4 | 3646 | |
1da177e4 LT |
3647 | } |
3648 | ||
3649 | ||
1da177e4 LT |
3650 | static int |
3651 | rs_ioctl(struct tty_struct *tty, struct file * file, | |
3652 | unsigned int cmd, unsigned long arg) | |
3653 | { | |
3654 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; | |
3655 | ||
3656 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
3657 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
3658 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
3659 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
3660 | return -EIO; | |
3661 | } | |
3662 | ||
3663 | switch (cmd) { | |
77accbf5 JN |
3664 | case TIOCGSERIAL: |
3665 | return get_serial_info(info, | |
3666 | (struct serial_struct *) arg); | |
3667 | case TIOCSSERIAL: | |
3668 | return set_serial_info(info, | |
3669 | (struct serial_struct *) arg); | |
3670 | case TIOCSERGETLSR: /* Get line status register */ | |
3671 | return get_lsr_info(info, (unsigned int *) arg); | |
3672 | ||
3673 | case TIOCSERGSTRUCT: | |
3674 | if (copy_to_user((struct e100_serial *) arg, | |
3675 | info, sizeof(struct e100_serial))) | |
3676 | return -EFAULT; | |
3677 | return 0; | |
1da177e4 LT |
3678 | |
3679 | #if defined(CONFIG_ETRAX_RS485) | |
77accbf5 JN |
3680 | case TIOCSERSETRS485: |
3681 | { | |
3682 | struct rs485_control rs485ctrl; | |
3683 | if (copy_from_user(&rs485ctrl, (struct rs485_control *)arg, | |
3684 | sizeof(rs485ctrl))) | |
3685 | return -EFAULT; | |
1da177e4 | 3686 | |
77accbf5 JN |
3687 | return e100_enable_rs485(tty, &rs485ctrl); |
3688 | } | |
1da177e4 | 3689 | |
77accbf5 JN |
3690 | case TIOCSERWRRS485: |
3691 | { | |
3692 | struct rs485_write rs485wr; | |
3693 | if (copy_from_user(&rs485wr, (struct rs485_write *)arg, | |
3694 | sizeof(rs485wr))) | |
3695 | return -EFAULT; | |
1da177e4 | 3696 | |
77accbf5 JN |
3697 | return e100_write_rs485(tty, rs485wr.outc, rs485wr.outc_size); |
3698 | } | |
1da177e4 LT |
3699 | #endif |
3700 | ||
77accbf5 JN |
3701 | default: |
3702 | return -ENOIOCTLCMD; | |
1da177e4 LT |
3703 | } |
3704 | return 0; | |
3705 | } | |
3706 | ||
3707 | static void | |
606d099c | 3708 | rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 LT |
3709 | { |
3710 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3711 | ||
1da177e4 LT |
3712 | change_speed(info); |
3713 | ||
3714 | /* Handle turning off CRTSCTS */ | |
3715 | if ((old_termios->c_cflag & CRTSCTS) && | |
3716 | !(tty->termios->c_cflag & CRTSCTS)) { | |
3717 | tty->hw_stopped = 0; | |
3718 | rs_start(tty); | |
3719 | } | |
3720 | ||
3721 | } | |
3722 | ||
1da177e4 LT |
3723 | /* |
3724 | * ------------------------------------------------------------ | |
3725 | * rs_close() | |
3726 | * | |
3727 | * This routine is called when the serial port gets closed. First, we | |
3728 | * wait for the last remaining data to be sent. Then, we unlink its | |
3729 | * S structure from the interrupt chain if necessary, and we free | |
3730 | * that IRQ if nothing is left in the chain. | |
3731 | * ------------------------------------------------------------ | |
3732 | */ | |
3733 | static void | |
3734 | rs_close(struct tty_struct *tty, struct file * filp) | |
3735 | { | |
3736 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; | |
3737 | unsigned long flags; | |
3738 | ||
3739 | if (!info) | |
3740 | return; | |
3741 | ||
3742 | /* interrupts are disabled for this entire function */ | |
3743 | ||
77accbf5 | 3744 | local_irq_save(flags); |
1da177e4 LT |
3745 | |
3746 | if (tty_hung_up_p(filp)) { | |
77accbf5 | 3747 | local_irq_restore(flags); |
1da177e4 LT |
3748 | return; |
3749 | } | |
3750 | ||
3751 | #ifdef SERIAL_DEBUG_OPEN | |
3752 | printk("[%d] rs_close ttyS%d, count = %d\n", current->pid, | |
3753 | info->line, info->count); | |
3754 | #endif | |
3755 | if ((tty->count == 1) && (info->count != 1)) { | |
3756 | /* | |
3757 | * Uh, oh. tty->count is 1, which means that the tty | |
3758 | * structure will be freed. Info->count should always | |
3759 | * be one in these conditions. If it's greater than | |
3760 | * one, we've got real problems, since it means the | |
3761 | * serial port won't be shutdown. | |
3762 | */ | |
3763 | printk(KERN_CRIT | |
3764 | "rs_close: bad serial port count; tty->count is 1, " | |
3765 | "info->count is %d\n", info->count); | |
3766 | info->count = 1; | |
3767 | } | |
3768 | if (--info->count < 0) { | |
3769 | printk(KERN_CRIT "rs_close: bad serial port count for ttyS%d: %d\n", | |
3770 | info->line, info->count); | |
3771 | info->count = 0; | |
3772 | } | |
3773 | if (info->count) { | |
77accbf5 | 3774 | local_irq_restore(flags); |
1da177e4 LT |
3775 | return; |
3776 | } | |
3777 | info->flags |= ASYNC_CLOSING; | |
3778 | /* | |
3779 | * Save the termios structure, since this port may have | |
3780 | * separate termios for callout and dialin. | |
3781 | */ | |
3782 | if (info->flags & ASYNC_NORMAL_ACTIVE) | |
3783 | info->normal_termios = *tty->termios; | |
3784 | /* | |
3785 | * Now we wait for the transmit buffer to clear; and we notify | |
3786 | * the line discipline to only process XON/XOFF characters. | |
3787 | */ | |
3788 | tty->closing = 1; | |
3789 | if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
3790 | tty_wait_until_sent(tty, info->closing_wait); | |
3791 | /* | |
3792 | * At this point we stop accepting input. To do this, we | |
3793 | * disable the serial receiver and the DMA receive interrupt. | |
3794 | */ | |
3795 | #ifdef SERIAL_HANDLE_EARLY_ERRORS | |
3796 | e100_disable_serial_data_irq(info); | |
3797 | #endif | |
3798 | ||
3799 | #ifndef CONFIG_SVINTO_SIM | |
3800 | e100_disable_rx(info); | |
3801 | e100_disable_rx_irq(info); | |
3802 | ||
3803 | if (info->flags & ASYNC_INITIALIZED) { | |
3804 | /* | |
3805 | * Before we drop DTR, make sure the UART transmitter | |
3806 | * has completely drained; this is especially | |
3807 | * important as we have a transmit FIFO! | |
3808 | */ | |
3809 | rs_wait_until_sent(tty, HZ); | |
3810 | } | |
3811 | #endif | |
3812 | ||
3813 | shutdown(info); | |
978e595f | 3814 | rs_flush_buffer(tty); |
454aa389 | 3815 | tty_ldisc_flush(tty); |
1da177e4 LT |
3816 | tty->closing = 0; |
3817 | info->event = 0; | |
a88487c7 | 3818 | info->port.tty = NULL; |
1da177e4 | 3819 | if (info->blocked_open) { |
3c76bc5b NA |
3820 | if (info->close_delay) |
3821 | schedule_timeout_interruptible(info->close_delay); | |
1da177e4 LT |
3822 | wake_up_interruptible(&info->open_wait); |
3823 | } | |
3824 | info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); | |
3825 | wake_up_interruptible(&info->close_wait); | |
77accbf5 | 3826 | local_irq_restore(flags); |
1da177e4 LT |
3827 | |
3828 | /* port closed */ | |
3829 | ||
3830 | #if defined(CONFIG_ETRAX_RS485) | |
3831 | if (info->rs485.enabled) { | |
3832 | info->rs485.enabled = 0; | |
3833 | #if defined(CONFIG_ETRAX_RS485_ON_PA) | |
3834 | *R_PORT_PA_DATA = port_pa_data_shadow &= ~(1 << rs485_pa_bit); | |
3835 | #endif | |
3836 | #if defined(CONFIG_ETRAX_RS485_ON_PORT_G) | |
3837 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, | |
3838 | rs485_port_g_bit, 0); | |
3839 | #endif | |
3840 | #if defined(CONFIG_ETRAX_RS485_LTC1387) | |
3841 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, | |
3842 | CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 0); | |
3843 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, | |
3844 | CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 0); | |
3845 | #endif | |
3846 | } | |
3847 | #endif | |
77accbf5 JN |
3848 | |
3849 | /* | |
3850 | * Release any allocated DMA irq's. | |
3851 | */ | |
3852 | if (info->dma_in_enabled) { | |
3853 | free_irq(info->dma_in_irq_nbr, info); | |
3854 | cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description); | |
3855 | info->uses_dma_in = 0; | |
3856 | #ifdef SERIAL_DEBUG_OPEN | |
3857 | printk(KERN_DEBUG "DMA irq '%s' freed\n", | |
3858 | info->dma_in_irq_description); | |
3859 | #endif | |
3860 | } | |
3861 | if (info->dma_out_enabled) { | |
3862 | free_irq(info->dma_out_irq_nbr, info); | |
3863 | cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description); | |
3864 | info->uses_dma_out = 0; | |
3865 | #ifdef SERIAL_DEBUG_OPEN | |
3866 | printk(KERN_DEBUG "DMA irq '%s' freed\n", | |
3867 | info->dma_out_irq_description); | |
3868 | #endif | |
3869 | } | |
1da177e4 LT |
3870 | } |
3871 | ||
3872 | /* | |
3873 | * rs_wait_until_sent() --- wait until the transmitter is empty | |
3874 | */ | |
3875 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
3876 | { | |
3877 | unsigned long orig_jiffies; | |
3878 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; | |
3879 | unsigned long curr_time = jiffies; | |
3880 | unsigned long curr_time_usec = GET_JIFFIES_USEC(); | |
3881 | long elapsed_usec = | |
3882 | (curr_time - info->last_tx_active) * (1000000/HZ) + | |
3883 | curr_time_usec - info->last_tx_active_usec; | |
3884 | ||
3885 | /* | |
3886 | * Check R_DMA_CHx_STATUS bit 0-6=number of available bytes in FIFO | |
3887 | * R_DMA_CHx_HWSW bit 31-16=nbr of bytes left in DMA buffer (0=64k) | |
3888 | */ | |
978e595f | 3889 | lock_kernel(); |
1da177e4 LT |
3890 | orig_jiffies = jiffies; |
3891 | while (info->xmit.head != info->xmit.tail || /* More in send queue */ | |
3892 | (*info->ostatusadr & 0x007f) || /* more in FIFO */ | |
3893 | (elapsed_usec < 2*info->char_time_usec)) { | |
3c76bc5b | 3894 | schedule_timeout_interruptible(1); |
1da177e4 LT |
3895 | if (signal_pending(current)) |
3896 | break; | |
3897 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
3898 | break; | |
3899 | curr_time = jiffies; | |
3900 | curr_time_usec = GET_JIFFIES_USEC(); | |
3901 | elapsed_usec = | |
3902 | (curr_time - info->last_tx_active) * (1000000/HZ) + | |
3903 | curr_time_usec - info->last_tx_active_usec; | |
3904 | } | |
3905 | set_current_state(TASK_RUNNING); | |
978e595f | 3906 | unlock_kernel(); |
1da177e4 LT |
3907 | } |
3908 | ||
3909 | /* | |
3910 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
3911 | */ | |
3912 | void | |
3913 | rs_hangup(struct tty_struct *tty) | |
3914 | { | |
3915 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; | |
3916 | ||
3917 | rs_flush_buffer(tty); | |
3918 | shutdown(info); | |
3919 | info->event = 0; | |
3920 | info->count = 0; | |
3921 | info->flags &= ~ASYNC_NORMAL_ACTIVE; | |
a88487c7 | 3922 | info->port.tty = NULL; |
1da177e4 LT |
3923 | wake_up_interruptible(&info->open_wait); |
3924 | } | |
3925 | ||
3926 | /* | |
3927 | * ------------------------------------------------------------ | |
3928 | * rs_open() and friends | |
3929 | * ------------------------------------------------------------ | |
3930 | */ | |
3931 | static int | |
3932 | block_til_ready(struct tty_struct *tty, struct file * filp, | |
3933 | struct e100_serial *info) | |
3934 | { | |
3935 | DECLARE_WAITQUEUE(wait, current); | |
3936 | unsigned long flags; | |
3937 | int retval; | |
3938 | int do_clocal = 0, extra_count = 0; | |
3939 | ||
3940 | /* | |
3941 | * If the device is in the middle of being closed, then block | |
3942 | * until it's done, and then try again. | |
3943 | */ | |
3944 | if (tty_hung_up_p(filp) || | |
3945 | (info->flags & ASYNC_CLOSING)) { | |
77accbf5 JN |
3946 | wait_event_interruptible(info->close_wait, |
3947 | !(info->flags & ASYNC_CLOSING)); | |
1da177e4 LT |
3948 | #ifdef SERIAL_DO_RESTART |
3949 | if (info->flags & ASYNC_HUP_NOTIFY) | |
3950 | return -EAGAIN; | |
3951 | else | |
3952 | return -ERESTARTSYS; | |
3953 | #else | |
3954 | return -EAGAIN; | |
3955 | #endif | |
3956 | } | |
3957 | ||
3958 | /* | |
3959 | * If non-blocking mode is set, or the port is not enabled, | |
3960 | * then make the check up front and then exit. | |
3961 | */ | |
3962 | if ((filp->f_flags & O_NONBLOCK) || | |
3963 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
3964 | info->flags |= ASYNC_NORMAL_ACTIVE; | |
3965 | return 0; | |
3966 | } | |
3967 | ||
3968 | if (tty->termios->c_cflag & CLOCAL) { | |
3969 | do_clocal = 1; | |
3970 | } | |
3971 | ||
3972 | /* | |
3973 | * Block waiting for the carrier detect and the line to become | |
3974 | * free (i.e., not in use by the callout). While we are in | |
3975 | * this loop, info->count is dropped by one, so that | |
3976 | * rs_close() knows when to free things. We restore it upon | |
3977 | * exit, either normal or abnormal. | |
3978 | */ | |
3979 | retval = 0; | |
3980 | add_wait_queue(&info->open_wait, &wait); | |
3981 | #ifdef SERIAL_DEBUG_OPEN | |
3982 | printk("block_til_ready before block: ttyS%d, count = %d\n", | |
3983 | info->line, info->count); | |
3984 | #endif | |
77accbf5 | 3985 | local_irq_save(flags); |
1da177e4 LT |
3986 | if (!tty_hung_up_p(filp)) { |
3987 | extra_count++; | |
3988 | info->count--; | |
3989 | } | |
77accbf5 | 3990 | local_irq_restore(flags); |
1da177e4 LT |
3991 | info->blocked_open++; |
3992 | while (1) { | |
77accbf5 | 3993 | local_irq_save(flags); |
1da177e4 LT |
3994 | /* assert RTS and DTR */ |
3995 | e100_rts(info, 1); | |
3996 | e100_dtr(info, 1); | |
77accbf5 | 3997 | local_irq_restore(flags); |
1da177e4 LT |
3998 | set_current_state(TASK_INTERRUPTIBLE); |
3999 | if (tty_hung_up_p(filp) || | |
4000 | !(info->flags & ASYNC_INITIALIZED)) { | |
4001 | #ifdef SERIAL_DO_RESTART | |
4002 | if (info->flags & ASYNC_HUP_NOTIFY) | |
4003 | retval = -EAGAIN; | |
4004 | else | |
4005 | retval = -ERESTARTSYS; | |
4006 | #else | |
4007 | retval = -EAGAIN; | |
4008 | #endif | |
4009 | break; | |
4010 | } | |
4011 | if (!(info->flags & ASYNC_CLOSING) && do_clocal) | |
4012 | /* && (do_clocal || DCD_IS_ASSERTED) */ | |
4013 | break; | |
4014 | if (signal_pending(current)) { | |
4015 | retval = -ERESTARTSYS; | |
4016 | break; | |
4017 | } | |
4018 | #ifdef SERIAL_DEBUG_OPEN | |
4019 | printk("block_til_ready blocking: ttyS%d, count = %d\n", | |
4020 | info->line, info->count); | |
4021 | #endif | |
4022 | schedule(); | |
4023 | } | |
4024 | set_current_state(TASK_RUNNING); | |
4025 | remove_wait_queue(&info->open_wait, &wait); | |
4026 | if (extra_count) | |
4027 | info->count++; | |
4028 | info->blocked_open--; | |
4029 | #ifdef SERIAL_DEBUG_OPEN | |
4030 | printk("block_til_ready after blocking: ttyS%d, count = %d\n", | |
4031 | info->line, info->count); | |
4032 | #endif | |
4033 | if (retval) | |
4034 | return retval; | |
4035 | info->flags |= ASYNC_NORMAL_ACTIVE; | |
4036 | return 0; | |
4037 | } | |
4038 | ||
77accbf5 JN |
4039 | static void |
4040 | deinit_port(struct e100_serial *info) | |
4041 | { | |
4042 | if (info->dma_out_enabled) { | |
4043 | cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description); | |
4044 | free_irq(info->dma_out_irq_nbr, info); | |
4045 | } | |
4046 | if (info->dma_in_enabled) { | |
4047 | cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description); | |
4048 | free_irq(info->dma_in_irq_nbr, info); | |
4049 | } | |
4050 | } | |
4051 | ||
1da177e4 LT |
4052 | /* |
4053 | * This routine is called whenever a serial port is opened. | |
4054 | * It performs the serial-specific initialization for the tty structure. | |
4055 | */ | |
4056 | static int | |
4057 | rs_open(struct tty_struct *tty, struct file * filp) | |
4058 | { | |
4059 | struct e100_serial *info; | |
4060 | int retval, line; | |
4061 | unsigned long page; | |
77accbf5 | 4062 | int allocated_resources = 0; |
1da177e4 LT |
4063 | |
4064 | /* find which port we want to open */ | |
1da177e4 LT |
4065 | line = tty->index; |
4066 | ||
4067 | if (line < 0 || line >= NR_PORTS) | |
4068 | return -ENODEV; | |
4069 | ||
4070 | /* find the corresponding e100_serial struct in the table */ | |
4071 | info = rs_table + line; | |
4072 | ||
4073 | /* don't allow the opening of ports that are not enabled in the HW config */ | |
4074 | if (!info->enabled) | |
4075 | return -ENODEV; | |
4076 | ||
4077 | #ifdef SERIAL_DEBUG_OPEN | |
4078 | printk("[%d] rs_open %s, count = %d\n", current->pid, tty->name, | |
4079 | info->count); | |
4080 | #endif | |
4081 | ||
4082 | info->count++; | |
4083 | tty->driver_data = info; | |
a88487c7 | 4084 | info->port.tty = tty; |
1da177e4 | 4085 | |
a88487c7 | 4086 | info->port.tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
4087 | |
4088 | if (!tmp_buf) { | |
4089 | page = get_zeroed_page(GFP_KERNEL); | |
4090 | if (!page) { | |
4091 | return -ENOMEM; | |
4092 | } | |
4093 | if (tmp_buf) | |
4094 | free_page(page); | |
4095 | else | |
4096 | tmp_buf = (unsigned char *) page; | |
4097 | } | |
4098 | ||
4099 | /* | |
4100 | * If the port is in the middle of closing, bail out now | |
4101 | */ | |
4102 | if (tty_hung_up_p(filp) || | |
4103 | (info->flags & ASYNC_CLOSING)) { | |
77accbf5 JN |
4104 | wait_event_interruptible(info->close_wait, |
4105 | !(info->flags & ASYNC_CLOSING)); | |
1da177e4 LT |
4106 | #ifdef SERIAL_DO_RESTART |
4107 | return ((info->flags & ASYNC_HUP_NOTIFY) ? | |
4108 | -EAGAIN : -ERESTARTSYS); | |
4109 | #else | |
4110 | return -EAGAIN; | |
4111 | #endif | |
4112 | } | |
4113 | ||
77accbf5 JN |
4114 | /* |
4115 | * If DMA is enabled try to allocate the irq's. | |
4116 | */ | |
4117 | if (info->count == 1) { | |
4118 | allocated_resources = 1; | |
4119 | if (info->dma_in_enabled) { | |
4120 | if (request_irq(info->dma_in_irq_nbr, | |
4121 | rec_interrupt, | |
4122 | info->dma_in_irq_flags, | |
4123 | info->dma_in_irq_description, | |
4124 | info)) { | |
4125 | printk(KERN_WARNING "DMA irq '%s' busy; " | |
4126 | "falling back to non-DMA mode\n", | |
4127 | info->dma_in_irq_description); | |
4128 | /* Make sure we never try to use DMA in */ | |
4129 | /* for the port again. */ | |
4130 | info->dma_in_enabled = 0; | |
4131 | } else if (cris_request_dma(info->dma_in_nbr, | |
4132 | info->dma_in_irq_description, | |
4133 | DMA_VERBOSE_ON_ERROR, | |
4134 | info->dma_owner)) { | |
4135 | free_irq(info->dma_in_irq_nbr, info); | |
4136 | printk(KERN_WARNING "DMA '%s' busy; " | |
4137 | "falling back to non-DMA mode\n", | |
4138 | info->dma_in_irq_description); | |
4139 | /* Make sure we never try to use DMA in */ | |
4140 | /* for the port again. */ | |
4141 | info->dma_in_enabled = 0; | |
4142 | } | |
4143 | #ifdef SERIAL_DEBUG_OPEN | |
4144 | else | |
4145 | printk(KERN_DEBUG "DMA irq '%s' allocated\n", | |
4146 | info->dma_in_irq_description); | |
4147 | #endif | |
4148 | } | |
4149 | if (info->dma_out_enabled) { | |
4150 | if (request_irq(info->dma_out_irq_nbr, | |
4151 | tr_interrupt, | |
4152 | info->dma_out_irq_flags, | |
4153 | info->dma_out_irq_description, | |
4154 | info)) { | |
4155 | printk(KERN_WARNING "DMA irq '%s' busy; " | |
4156 | "falling back to non-DMA mode\n", | |
4157 | info->dma_out_irq_description); | |
4158 | /* Make sure we never try to use DMA out */ | |
4159 | /* for the port again. */ | |
4160 | info->dma_out_enabled = 0; | |
4161 | } else if (cris_request_dma(info->dma_out_nbr, | |
4162 | info->dma_out_irq_description, | |
4163 | DMA_VERBOSE_ON_ERROR, | |
4164 | info->dma_owner)) { | |
4165 | free_irq(info->dma_out_irq_nbr, info); | |
4166 | printk(KERN_WARNING "DMA '%s' busy; " | |
4167 | "falling back to non-DMA mode\n", | |
4168 | info->dma_out_irq_description); | |
4169 | /* Make sure we never try to use DMA out */ | |
4170 | /* for the port again. */ | |
4171 | info->dma_out_enabled = 0; | |
4172 | } | |
4173 | #ifdef SERIAL_DEBUG_OPEN | |
4174 | else | |
4175 | printk(KERN_DEBUG "DMA irq '%s' allocated\n", | |
4176 | info->dma_out_irq_description); | |
4177 | #endif | |
4178 | } | |
4179 | } | |
4180 | ||
1da177e4 LT |
4181 | /* |
4182 | * Start up the serial port | |
4183 | */ | |
4184 | ||
4185 | retval = startup(info); | |
77accbf5 JN |
4186 | if (retval) { |
4187 | if (allocated_resources) | |
4188 | deinit_port(info); | |
4189 | ||
4190 | /* FIXME Decrease count info->count here too? */ | |
1da177e4 | 4191 | return retval; |
77accbf5 JN |
4192 | } |
4193 | ||
1da177e4 LT |
4194 | |
4195 | retval = block_til_ready(tty, filp, info); | |
4196 | if (retval) { | |
4197 | #ifdef SERIAL_DEBUG_OPEN | |
4198 | printk("rs_open returning after block_til_ready with %d\n", | |
4199 | retval); | |
4200 | #endif | |
77accbf5 JN |
4201 | if (allocated_resources) |
4202 | deinit_port(info); | |
4203 | ||
1da177e4 LT |
4204 | return retval; |
4205 | } | |
4206 | ||
4207 | if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) { | |
4208 | *tty->termios = info->normal_termios; | |
4209 | change_speed(info); | |
4210 | } | |
4211 | ||
4212 | #ifdef SERIAL_DEBUG_OPEN | |
4213 | printk("rs_open ttyS%d successful...\n", info->line); | |
4214 | #endif | |
4215 | DLOG_INT_TRIG( log_int_pos = 0); | |
4216 | ||
4217 | DFLIP( if (info->line == SERIAL_DEBUG_LINE) { | |
4218 | info->icount.rx = 0; | |
4219 | } ); | |
4220 | ||
4221 | return 0; | |
4222 | } | |
4223 | ||
4224 | /* | |
4225 | * /proc fs routines.... | |
4226 | */ | |
4227 | ||
41c28ff1 | 4228 | static int line_info(char *buf, struct e100_serial *info) |
1da177e4 LT |
4229 | { |
4230 | char stat_buf[30]; | |
4231 | int ret; | |
4232 | unsigned long tmp; | |
4233 | ||
4234 | ret = sprintf(buf, "%d: uart:E100 port:%lX irq:%d", | |
d7283353 | 4235 | info->line, (unsigned long)info->ioport, info->irq); |
1da177e4 | 4236 | |
d7283353 | 4237 | if (!info->ioport || (info->type == PORT_UNKNOWN)) { |
1da177e4 LT |
4238 | ret += sprintf(buf+ret, "\n"); |
4239 | return ret; | |
4240 | } | |
4241 | ||
4242 | stat_buf[0] = 0; | |
4243 | stat_buf[1] = 0; | |
4244 | if (!E100_RTS_GET(info)) | |
4245 | strcat(stat_buf, "|RTS"); | |
4246 | if (!E100_CTS_GET(info)) | |
4247 | strcat(stat_buf, "|CTS"); | |
4248 | if (!E100_DTR_GET(info)) | |
4249 | strcat(stat_buf, "|DTR"); | |
4250 | if (!E100_DSR_GET(info)) | |
4251 | strcat(stat_buf, "|DSR"); | |
4252 | if (!E100_CD_GET(info)) | |
4253 | strcat(stat_buf, "|CD"); | |
4254 | if (!E100_RI_GET(info)) | |
4255 | strcat(stat_buf, "|RI"); | |
4256 | ||
4257 | ret += sprintf(buf+ret, " baud:%d", info->baud); | |
4258 | ||
4259 | ret += sprintf(buf+ret, " tx:%lu rx:%lu", | |
4260 | (unsigned long)info->icount.tx, | |
4261 | (unsigned long)info->icount.rx); | |
4262 | tmp = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
4263 | if (tmp) { | |
4264 | ret += sprintf(buf+ret, " tx_pend:%lu/%lu", | |
4265 | (unsigned long)tmp, | |
4266 | (unsigned long)SERIAL_XMIT_SIZE); | |
4267 | } | |
4268 | ||
4269 | ret += sprintf(buf+ret, " rx_pend:%lu/%lu", | |
4270 | (unsigned long)info->recv_cnt, | |
4271 | (unsigned long)info->max_recv_cnt); | |
4272 | ||
4273 | #if 1 | |
a88487c7 | 4274 | if (info->port.tty) { |
1da177e4 | 4275 | |
a88487c7 | 4276 | if (info->port.tty->stopped) |
1da177e4 | 4277 | ret += sprintf(buf+ret, " stopped:%i", |
a88487c7 TI |
4278 | (int)info->port.tty->stopped); |
4279 | if (info->port.tty->hw_stopped) | |
1da177e4 | 4280 | ret += sprintf(buf+ret, " hw_stopped:%i", |
a88487c7 | 4281 | (int)info->port.tty->hw_stopped); |
1da177e4 LT |
4282 | } |
4283 | ||
4284 | { | |
d7283353 | 4285 | unsigned char rstat = info->ioport[REG_STATUS]; |
1da177e4 LT |
4286 | if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) |
4287 | ret += sprintf(buf+ret, " xoff_detect:1"); | |
4288 | } | |
4289 | ||
4290 | #endif | |
4291 | ||
4292 | ||
4293 | ||
4294 | ||
4295 | if (info->icount.frame) | |
4296 | ret += sprintf(buf+ret, " fe:%lu", | |
4297 | (unsigned long)info->icount.frame); | |
4298 | ||
4299 | if (info->icount.parity) | |
4300 | ret += sprintf(buf+ret, " pe:%lu", | |
4301 | (unsigned long)info->icount.parity); | |
4302 | ||
4303 | if (info->icount.brk) | |
4304 | ret += sprintf(buf+ret, " brk:%lu", | |
4305 | (unsigned long)info->icount.brk); | |
4306 | ||
4307 | if (info->icount.overrun) | |
4308 | ret += sprintf(buf+ret, " oe:%lu", | |
4309 | (unsigned long)info->icount.overrun); | |
4310 | ||
4311 | /* | |
4312 | * Last thing is the RS-232 status lines | |
4313 | */ | |
4314 | ret += sprintf(buf+ret, " %s\n", stat_buf+1); | |
4315 | return ret; | |
4316 | } | |
4317 | ||
4318 | int rs_read_proc(char *page, char **start, off_t off, int count, | |
4319 | int *eof, void *data) | |
4320 | { | |
4321 | int i, len = 0, l; | |
4322 | off_t begin = 0; | |
4323 | ||
4324 | len += sprintf(page, "serinfo:1.0 driver:%s\n", | |
4325 | serial_version); | |
4326 | for (i = 0; i < NR_PORTS && len < 4000; i++) { | |
4327 | if (!rs_table[i].enabled) | |
4328 | continue; | |
4329 | l = line_info(page + len, &rs_table[i]); | |
4330 | len += l; | |
4331 | if (len+begin > off+count) | |
4332 | goto done; | |
4333 | if (len+begin < off) { | |
4334 | begin += len; | |
4335 | len = 0; | |
4336 | } | |
4337 | } | |
4338 | #ifdef DEBUG_LOG_INCLUDED | |
4339 | for (i = 0; i < debug_log_pos; i++) { | |
4340 | len += sprintf(page + len, "%-4i %lu.%lu ", i, debug_log[i].time, timer_data_to_ns(debug_log[i].timer_data)); | |
4341 | len += sprintf(page + len, debug_log[i].string, debug_log[i].value); | |
4342 | if (len+begin > off+count) | |
4343 | goto done; | |
4344 | if (len+begin < off) { | |
4345 | begin += len; | |
4346 | len = 0; | |
4347 | } | |
4348 | } | |
4349 | len += sprintf(page + len, "debug_log %i/%i %li bytes\n", | |
4350 | i, DEBUG_LOG_SIZE, begin+len); | |
4351 | debug_log_pos = 0; | |
4352 | #endif | |
4353 | ||
4354 | *eof = 1; | |
4355 | done: | |
4356 | if (off >= len+begin) | |
4357 | return 0; | |
4358 | *start = page + (off-begin); | |
4359 | return ((count < begin+len-off) ? count : begin+len-off); | |
4360 | } | |
4361 | ||
4362 | /* Finally, routines used to initialize the serial driver. */ | |
4363 | ||
4364 | static void | |
4365 | show_serial_version(void) | |
4366 | { | |
4367 | printk(KERN_INFO | |
4368 | "ETRAX 100LX serial-driver %s, (c) 2000-2004 Axis Communications AB\r\n", | |
4369 | &serial_version[11]); /* "$Revision: x.yy" */ | |
4370 | } | |
4371 | ||
4372 | /* rs_init inits the driver at boot (using the module_init chain) */ | |
4373 | ||
b68e31d0 | 4374 | static const struct tty_operations rs_ops = { |
1da177e4 LT |
4375 | .open = rs_open, |
4376 | .close = rs_close, | |
4377 | .write = rs_write, | |
4378 | .flush_chars = rs_flush_chars, | |
4379 | .write_room = rs_write_room, | |
4380 | .chars_in_buffer = rs_chars_in_buffer, | |
4381 | .flush_buffer = rs_flush_buffer, | |
4382 | .ioctl = rs_ioctl, | |
4383 | .throttle = rs_throttle, | |
4384 | .unthrottle = rs_unthrottle, | |
4385 | .set_termios = rs_set_termios, | |
4386 | .stop = rs_stop, | |
4387 | .start = rs_start, | |
4388 | .hangup = rs_hangup, | |
4389 | .break_ctl = rs_break, | |
4390 | .send_xchar = rs_send_xchar, | |
4391 | .wait_until_sent = rs_wait_until_sent, | |
4392 | .read_proc = rs_read_proc, | |
77accbf5 JN |
4393 | .tiocmget = rs_tiocmget, |
4394 | .tiocmset = rs_tiocmset | |
1da177e4 LT |
4395 | }; |
4396 | ||
4397 | static int __init | |
4398 | rs_init(void) | |
4399 | { | |
4400 | int i; | |
4401 | struct e100_serial *info; | |
4402 | struct tty_driver *driver = alloc_tty_driver(NR_PORTS); | |
4403 | ||
4404 | if (!driver) | |
4405 | return -ENOMEM; | |
4406 | ||
4407 | show_serial_version(); | |
4408 | ||
4409 | /* Setup the timed flush handler system */ | |
4410 | ||
4411 | #if !defined(CONFIG_ETRAX_SERIAL_FAST_TIMER) | |
77accbf5 JN |
4412 | setup_timer(&flush_timer, timed_flush_handler, 0); |
4413 | mod_timer(&flush_timer, jiffies + 5); | |
4414 | #endif | |
4415 | ||
4416 | #if defined(CONFIG_ETRAX_RS485) | |
4417 | #if defined(CONFIG_ETRAX_RS485_ON_PA) | |
4418 | if (cris_io_interface_allocate_pins(if_ser0, 'a', rs485_pa_bit, | |
4419 | rs485_pa_bit)) { | |
4420 | printk(KERN_CRIT "ETRAX100LX serial: Could not allocate " | |
4421 | "RS485 pin\n"); | |
4422 | return -EBUSY; | |
4423 | } | |
4424 | #endif | |
4425 | #if defined(CONFIG_ETRAX_RS485_ON_PORT_G) | |
4426 | if (cris_io_interface_allocate_pins(if_ser0, 'g', rs485_pa_bit, | |
4427 | rs485_port_g_bit)) { | |
4428 | printk(KERN_CRIT "ETRAX100LX serial: Could not allocate " | |
4429 | "RS485 pin\n"); | |
4430 | return -EBUSY; | |
4431 | } | |
4432 | #endif | |
1da177e4 LT |
4433 | #endif |
4434 | ||
4435 | /* Initialize the tty_driver structure */ | |
4436 | ||
4437 | driver->driver_name = "serial"; | |
4438 | driver->name = "ttyS"; | |
4439 | driver->major = TTY_MAJOR; | |
4440 | driver->minor_start = 64; | |
4441 | driver->type = TTY_DRIVER_TYPE_SERIAL; | |
4442 | driver->subtype = SERIAL_TYPE_NORMAL; | |
4443 | driver->init_termios = tty_std_termios; | |
4444 | driver->init_termios.c_cflag = | |
4445 | B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */ | |
606d099c AC |
4446 | driver->init_termios.c_ispeed = 115200; |
4447 | driver->init_termios.c_ospeed = 115200; | |
331b8319 | 4448 | driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 LT |
4449 | driver->termios = serial_termios; |
4450 | driver->termios_locked = serial_termios_locked; | |
4451 | ||
4452 | tty_set_operations(driver, &rs_ops); | |
4453 | serial_driver = driver; | |
4454 | if (tty_register_driver(driver)) | |
4455 | panic("Couldn't register serial driver\n"); | |
4456 | /* do some initializing for the separate ports */ | |
4457 | ||
4458 | for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) { | |
77accbf5 JN |
4459 | if (info->enabled) { |
4460 | if (cris_request_io_interface(info->io_if, | |
4461 | info->io_if_description)) { | |
4462 | printk(KERN_CRIT "ETRAX100LX async serial: " | |
4463 | "Could not allocate IO pins for " | |
4464 | "%s, port %d\n", | |
4465 | info->io_if_description, i); | |
4466 | info->enabled = 0; | |
4467 | } | |
4468 | } | |
1da177e4 LT |
4469 | info->uses_dma_in = 0; |
4470 | info->uses_dma_out = 0; | |
4471 | info->line = i; | |
a88487c7 | 4472 | info->port.tty = NULL; |
1da177e4 LT |
4473 | info->type = PORT_ETRAX; |
4474 | info->tr_running = 0; | |
4475 | info->forced_eop = 0; | |
4476 | info->baud_base = DEF_BAUD_BASE; | |
4477 | info->custom_divisor = 0; | |
4478 | info->flags = 0; | |
4479 | info->close_delay = 5*HZ/10; | |
4480 | info->closing_wait = 30*HZ; | |
4481 | info->x_char = 0; | |
4482 | info->event = 0; | |
4483 | info->count = 0; | |
4484 | info->blocked_open = 0; | |
4485 | info->normal_termios = driver->init_termios; | |
4486 | init_waitqueue_head(&info->open_wait); | |
4487 | init_waitqueue_head(&info->close_wait); | |
4488 | info->xmit.buf = NULL; | |
4489 | info->xmit.tail = info->xmit.head = 0; | |
4490 | info->first_recv_buffer = info->last_recv_buffer = NULL; | |
4491 | info->recv_cnt = info->max_recv_cnt = 0; | |
4492 | info->last_tx_active_usec = 0; | |
4493 | info->last_tx_active = 0; | |
4494 | ||
4495 | #if defined(CONFIG_ETRAX_RS485) | |
4496 | /* Set sane defaults */ | |
4497 | info->rs485.rts_on_send = 0; | |
4498 | info->rs485.rts_after_sent = 1; | |
4499 | info->rs485.delay_rts_before_send = 0; | |
4500 | info->rs485.enabled = 0; | |
4501 | #endif | |
77accbf5 | 4502 | INIT_WORK(&info->work, do_softint); |
1da177e4 LT |
4503 | |
4504 | if (info->enabled) { | |
4505 | printk(KERN_INFO "%s%d at 0x%x is a builtin UART with DMA\n", | |
d7283353 | 4506 | serial_driver->name, info->line, (unsigned int)info->ioport); |
1da177e4 LT |
4507 | } |
4508 | } | |
4509 | #ifdef CONFIG_ETRAX_FAST_TIMER | |
4510 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER | |
4511 | memset(fast_timers, 0, sizeof(fast_timers)); | |
4512 | #endif | |
4513 | #ifdef CONFIG_ETRAX_RS485 | |
4514 | memset(fast_timers_rs485, 0, sizeof(fast_timers_rs485)); | |
4515 | #endif | |
4516 | fast_timer_init(); | |
4517 | #endif | |
4518 | ||
4519 | #ifndef CONFIG_SVINTO_SIM | |
77accbf5 | 4520 | #ifndef CONFIG_ETRAX_KGDB |
1da177e4 LT |
4521 | /* Not needed in simulator. May only complicate stuff. */ |
4522 | /* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */ | |
4523 | ||
77accbf5 JN |
4524 | if (request_irq(SERIAL_IRQ_NBR, ser_interrupt, |
4525 | IRQF_SHARED | IRQF_DISABLED, "serial ", driver)) | |
71cc2c21 | 4526 | panic("%s: Failed to request irq8", __func__); |
1da177e4 | 4527 | |
1da177e4 LT |
4528 | #endif |
4529 | #endif /* CONFIG_SVINTO_SIM */ | |
77accbf5 | 4530 | |
1da177e4 LT |
4531 | return 0; |
4532 | } | |
4533 | ||
4534 | /* this makes sure that rs_init is called during kernel boot */ | |
4535 | ||
4536 | module_init(rs_init); |