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1da177e4 LT |
1 | /* |
2 | * linux/drivers/char/serial_core.h | |
3 | * | |
4 | * Copyright (C) 2000 Deep Blue Solutions Ltd. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | #ifndef LINUX_SERIAL_CORE_H | |
21 | #define LINUX_SERIAL_CORE_H | |
22 | ||
23 | /* | |
24 | * The type definitions. These are from Ted Ts'o's serial.h | |
25 | */ | |
26 | #define PORT_UNKNOWN 0 | |
27 | #define PORT_8250 1 | |
28 | #define PORT_16450 2 | |
29 | #define PORT_16550 3 | |
30 | #define PORT_16550A 4 | |
31 | #define PORT_CIRRUS 5 | |
32 | #define PORT_16650 6 | |
33 | #define PORT_16650V2 7 | |
34 | #define PORT_16750 8 | |
35 | #define PORT_STARTECH 9 | |
36 | #define PORT_16C950 10 | |
37 | #define PORT_16654 11 | |
38 | #define PORT_16850 12 | |
39 | #define PORT_RSA 13 | |
40 | #define PORT_NS16550A 14 | |
41 | #define PORT_XSCALE 15 | |
bd71c182 TK |
42 | #define PORT_RM9000 16 /* PMC-Sierra RM9xxx internal UART */ |
43 | #define PORT_MAX_8250 16 /* max port ID */ | |
1da177e4 LT |
44 | |
45 | /* | |
46 | * ARM specific type numbers. These are not currently guaranteed | |
47 | * to be implemented, and will change in the future. These are | |
48 | * separate so any additions to the old serial.c that occur before | |
49 | * we are merged can be easily merged here. | |
50 | */ | |
51 | #define PORT_PXA 31 | |
52 | #define PORT_AMBA 32 | |
53 | #define PORT_CLPS711X 33 | |
54 | #define PORT_SA1100 34 | |
55 | #define PORT_UART00 35 | |
56 | #define PORT_21285 37 | |
57 | ||
58 | /* Sparc type numbers. */ | |
59 | #define PORT_SUNZILOG 38 | |
60 | #define PORT_SUNSAB 39 | |
61 | ||
62 | /* NEC v850. */ | |
63 | #define PORT_V850E_UART 40 | |
64 | ||
65 | /* DZ */ | |
66 | #define PORT_DZ 47 | |
67 | ||
68 | /* Parisc type numbers. */ | |
69 | #define PORT_MUX 48 | |
70 | ||
9ab4f88b HS |
71 | /* Atmel AT91 / AT32 SoC */ |
72 | #define PORT_ATMEL 49 | |
1e6c9c28 | 73 | |
1da177e4 LT |
74 | /* Macintosh Zilog type numbers */ |
75 | #define PORT_MAC_ZILOG 50 /* m68k : not yet implemented */ | |
76 | #define PORT_PMAC_ZILOG 51 | |
77 | ||
78 | /* SH-SCI */ | |
79 | #define PORT_SCI 52 | |
80 | #define PORT_SCIF 53 | |
81 | #define PORT_IRDA 54 | |
82 | ||
83 | /* Samsung S3C2410 SoC and derivatives thereof */ | |
84 | #define PORT_S3C2410 55 | |
85 | ||
86 | /* SGI IP22 aka Indy / Challenge S / Indigo 2 */ | |
87 | #define PORT_IP22ZILOG 56 | |
88 | ||
89 | /* Sharp LH7a40x -- an ARM9 SoC series */ | |
90 | #define PORT_LH7A40X 57 | |
91 | ||
92 | /* PPC CPM type number */ | |
93 | #define PORT_CPM 58 | |
94 | ||
95 | /* MPC52xx type numbers */ | |
96 | #define PORT_MPC52xx 59 | |
97 | ||
98 | /* IBM icom */ | |
99 | #define PORT_ICOM 60 | |
100 | ||
101 | /* Samsung S3C2440 SoC */ | |
102 | #define PORT_S3C2440 61 | |
103 | ||
104 | /* Motorola i.MX SoC */ | |
105 | #define PORT_IMX 62 | |
106 | ||
107 | /* Marvell MPSC */ | |
108 | #define PORT_MPSC 63 | |
109 | ||
110 | /* TXX9 type number */ | |
e5c2d749 | 111 | #define PORT_TXX9 64 |
1da177e4 LT |
112 | |
113 | /* NEC VR4100 series SIU/DSIU */ | |
114 | #define PORT_VR41XX_SIU 65 | |
115 | #define PORT_VR41XX_DSIU 66 | |
116 | ||
117 | /* Samsung S3C2400 SoC */ | |
118 | #define PORT_S3C2400 67 | |
119 | ||
120 | /* M32R SIO */ | |
121 | #define PORT_M32R_SIO 68 | |
122 | ||
123 | /*Digi jsm */ | |
913ade51 RK |
124 | #define PORT_JSM 69 |
125 | ||
e6fa0ba3 | 126 | #define PORT_PNX8XXX 70 |
1da177e4 | 127 | |
f5417612 SH |
128 | /* Hilscher netx */ |
129 | #define PORT_NETX 71 | |
130 | ||
02fd473b DM |
131 | /* SUN4V Hypervisor Console */ |
132 | #define PORT_SUNHV 72 | |
133 | ||
73e55cb3 BD |
134 | #define PORT_S3C2412 73 |
135 | ||
238b8721 PK |
136 | /* Xilinx uartlite */ |
137 | #define PORT_UARTLITE 74 | |
73e55cb3 | 138 | |
194de561 BW |
139 | /* Blackfin bf5xx */ |
140 | #define PORT_BFIN 75 | |
141 | ||
2c7ee6ab AV |
142 | /* Micrel KS8695 */ |
143 | #define PORT_KS8695 76 | |
144 | ||
145 | ||
1da177e4 LT |
146 | #ifdef __KERNEL__ |
147 | ||
661f83a6 | 148 | #include <linux/compiler.h> |
1da177e4 LT |
149 | #include <linux/interrupt.h> |
150 | #include <linux/circ_buf.h> | |
151 | #include <linux/spinlock.h> | |
152 | #include <linux/sched.h> | |
153 | #include <linux/tty.h> | |
e2862f6a | 154 | #include <linux/mutex.h> |
b11115c1 | 155 | #include <linux/sysrq.h> |
1da177e4 LT |
156 | |
157 | struct uart_port; | |
158 | struct uart_info; | |
159 | struct serial_struct; | |
160 | struct device; | |
161 | ||
162 | /* | |
163 | * This structure describes all the operations that can be | |
164 | * done on the physical hardware. | |
165 | */ | |
166 | struct uart_ops { | |
167 | unsigned int (*tx_empty)(struct uart_port *); | |
168 | void (*set_mctrl)(struct uart_port *, unsigned int mctrl); | |
169 | unsigned int (*get_mctrl)(struct uart_port *); | |
b129a8cc RK |
170 | void (*stop_tx)(struct uart_port *); |
171 | void (*start_tx)(struct uart_port *); | |
1da177e4 LT |
172 | void (*send_xchar)(struct uart_port *, char ch); |
173 | void (*stop_rx)(struct uart_port *); | |
174 | void (*enable_ms)(struct uart_port *); | |
175 | void (*break_ctl)(struct uart_port *, int ctl); | |
176 | int (*startup)(struct uart_port *); | |
177 | void (*shutdown)(struct uart_port *); | |
606d099c AC |
178 | void (*set_termios)(struct uart_port *, struct ktermios *new, |
179 | struct ktermios *old); | |
1da177e4 LT |
180 | void (*pm)(struct uart_port *, unsigned int state, |
181 | unsigned int oldstate); | |
182 | int (*set_wake)(struct uart_port *, unsigned int state); | |
183 | ||
184 | /* | |
185 | * Return a string describing the type of the port | |
186 | */ | |
187 | const char *(*type)(struct uart_port *); | |
188 | ||
189 | /* | |
190 | * Release IO and memory resources used by the port. | |
191 | * This includes iounmap if necessary. | |
192 | */ | |
193 | void (*release_port)(struct uart_port *); | |
194 | ||
195 | /* | |
196 | * Request IO and memory resources used by the port. | |
197 | * This includes iomapping the port if necessary. | |
198 | */ | |
199 | int (*request_port)(struct uart_port *); | |
200 | void (*config_port)(struct uart_port *, int); | |
201 | int (*verify_port)(struct uart_port *, struct serial_struct *); | |
202 | int (*ioctl)(struct uart_port *, unsigned int, unsigned long); | |
203 | }; | |
204 | ||
205 | #define UART_CONFIG_TYPE (1 << 0) | |
206 | #define UART_CONFIG_IRQ (1 << 1) | |
207 | ||
208 | struct uart_icount { | |
209 | __u32 cts; | |
210 | __u32 dsr; | |
211 | __u32 rng; | |
212 | __u32 dcd; | |
213 | __u32 rx; | |
214 | __u32 tx; | |
215 | __u32 frame; | |
216 | __u32 overrun; | |
217 | __u32 parity; | |
218 | __u32 brk; | |
219 | __u32 buf_overrun; | |
220 | }; | |
221 | ||
0077d45e RK |
222 | typedef unsigned int __bitwise__ upf_t; |
223 | ||
1da177e4 LT |
224 | struct uart_port { |
225 | spinlock_t lock; /* port lock */ | |
226 | unsigned int iobase; /* in/out[bwl] */ | |
227 | unsigned char __iomem *membase; /* read/write[bwl] */ | |
228 | unsigned int irq; /* irq number */ | |
229 | unsigned int uartclk; /* base uart clock */ | |
947deee8 | 230 | unsigned int fifosize; /* tx fifo size */ |
1da177e4 LT |
231 | unsigned char x_char; /* xon/xoff char */ |
232 | unsigned char regshift; /* reg offset shift */ | |
233 | unsigned char iotype; /* io access style */ | |
947deee8 | 234 | unsigned char unused1; |
1da177e4 LT |
235 | |
236 | #define UPIO_PORT (0) | |
237 | #define UPIO_HUB6 (1) | |
238 | #define UPIO_MEM (2) | |
239 | #define UPIO_MEM32 (3) | |
21c614a7 | 240 | #define UPIO_AU (4) /* Au1x00 type IO */ |
3be91ec7 | 241 | #define UPIO_TSI (5) /* Tsi108/109 type IO */ |
beab697a | 242 | #define UPIO_DWAPB (6) /* DesignWare APB UART */ |
bd71c182 | 243 | #define UPIO_RM9000 (7) /* RM9000 type IO */ |
1da177e4 LT |
244 | |
245 | unsigned int read_status_mask; /* driver specific */ | |
246 | unsigned int ignore_status_mask; /* driver specific */ | |
247 | struct uart_info *info; /* pointer to parent info */ | |
248 | struct uart_icount icount; /* statistics */ | |
249 | ||
250 | struct console *cons; /* struct console, if any */ | |
251 | #ifdef CONFIG_SERIAL_CORE_CONSOLE | |
252 | unsigned long sysrq; /* sysrq timeout */ | |
253 | #endif | |
254 | ||
0077d45e RK |
255 | upf_t flags; |
256 | ||
257 | #define UPF_FOURPORT ((__force upf_t) (1 << 1)) | |
258 | #define UPF_SAK ((__force upf_t) (1 << 2)) | |
259 | #define UPF_SPD_MASK ((__force upf_t) (0x1030)) | |
260 | #define UPF_SPD_HI ((__force upf_t) (0x0010)) | |
261 | #define UPF_SPD_VHI ((__force upf_t) (0x0020)) | |
262 | #define UPF_SPD_CUST ((__force upf_t) (0x0030)) | |
263 | #define UPF_SPD_SHI ((__force upf_t) (0x1000)) | |
264 | #define UPF_SPD_WARP ((__force upf_t) (0x1010)) | |
265 | #define UPF_SKIP_TEST ((__force upf_t) (1 << 6)) | |
266 | #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7)) | |
267 | #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11)) | |
268 | #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13)) | |
269 | #define UPF_BUGGY_UART ((__force upf_t) (1 << 14)) | |
270 | #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16)) | |
271 | #define UPF_CONS_FLOW ((__force upf_t) (1 << 23)) | |
272 | #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24)) | |
273 | #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28)) | |
abb4a239 | 274 | #define UPF_FIXED_PORT ((__force upf_t) (1 << 29)) |
68ac64cd | 275 | #define UPF_DEAD ((__force upf_t) (1 << 30)) |
0077d45e RK |
276 | #define UPF_IOREMAP ((__force upf_t) (1 << 31)) |
277 | ||
278 | #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff)) | |
279 | #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY)) | |
1da177e4 LT |
280 | |
281 | unsigned int mctrl; /* current modem ctrl settings */ | |
282 | unsigned int timeout; /* character-based timeout */ | |
283 | unsigned int type; /* port type */ | |
ba899dbc | 284 | const struct uart_ops *ops; |
1da177e4 LT |
285 | unsigned int custom_divisor; |
286 | unsigned int line; /* port index */ | |
287 | unsigned long mapbase; /* for ioremap */ | |
288 | struct device *dev; /* parent device */ | |
289 | unsigned char hub6; /* this should be in the 8250 driver */ | |
290 | unsigned char unused[3]; | |
beab697a | 291 | void *private_data; /* generic platform data pointer */ |
1da177e4 LT |
292 | }; |
293 | ||
294 | /* | |
295 | * This is the state information which is persistent across opens. | |
296 | * The low level driver must not to touch any elements contained | |
297 | * within. | |
298 | */ | |
299 | struct uart_state { | |
300 | unsigned int close_delay; /* msec */ | |
301 | unsigned int closing_wait; /* msec */ | |
302 | ||
303 | #define USF_CLOSING_WAIT_INF (0) | |
304 | #define USF_CLOSING_WAIT_NONE (~0U) | |
305 | ||
306 | int count; | |
307 | int pm_state; | |
308 | struct uart_info *info; | |
309 | struct uart_port *port; | |
310 | ||
e2862f6a | 311 | struct mutex mutex; |
1da177e4 LT |
312 | }; |
313 | ||
314 | #define UART_XMIT_SIZE PAGE_SIZE | |
747c8a55 RK |
315 | |
316 | typedef unsigned int __bitwise__ uif_t; | |
317 | ||
1da177e4 LT |
318 | /* |
319 | * This is the state information which is only valid when the port | |
320 | * is open; it may be freed by the core driver once the device has | |
321 | * been closed. Either the low level driver or the core can modify | |
322 | * stuff here. | |
323 | */ | |
324 | struct uart_info { | |
325 | struct tty_struct *tty; | |
326 | struct circ_buf xmit; | |
747c8a55 | 327 | uif_t flags; |
1da177e4 LT |
328 | |
329 | /* | |
747c8a55 RK |
330 | * Definitions for info->flags. These are _private_ to serial_core, and |
331 | * are specific to this structure. They may be queried by low level drivers. | |
1da177e4 | 332 | */ |
747c8a55 RK |
333 | #define UIF_CHECK_CD ((__force uif_t) (1 << 25)) |
334 | #define UIF_CTS_FLOW ((__force uif_t) (1 << 26)) | |
335 | #define UIF_NORMAL_ACTIVE ((__force uif_t) (1 << 29)) | |
336 | #define UIF_INITIALIZED ((__force uif_t) (1 << 31)) | |
a6b93a90 | 337 | #define UIF_SUSPENDED ((__force uif_t) (1 << 30)) |
1da177e4 LT |
338 | |
339 | int blocked_open; | |
340 | ||
341 | struct tasklet_struct tlet; | |
342 | ||
343 | wait_queue_head_t open_wait; | |
344 | wait_queue_head_t delta_msr_wait; | |
345 | }; | |
346 | ||
347 | /* number of characters left in xmit buffer before we ask for more */ | |
348 | #define WAKEUP_CHARS 256 | |
349 | ||
350 | struct module; | |
351 | struct tty_driver; | |
352 | ||
353 | struct uart_driver { | |
354 | struct module *owner; | |
355 | const char *driver_name; | |
356 | const char *dev_name; | |
1da177e4 LT |
357 | int major; |
358 | int minor; | |
359 | int nr; | |
360 | struct console *cons; | |
361 | ||
362 | /* | |
363 | * these are private; the low level driver should not | |
364 | * touch these; they should be initialised to NULL | |
365 | */ | |
366 | struct uart_state *state; | |
367 | struct tty_driver *tty_driver; | |
368 | }; | |
369 | ||
370 | void uart_write_wakeup(struct uart_port *port); | |
371 | ||
372 | /* | |
373 | * Baud rate helpers. | |
374 | */ | |
375 | void uart_update_timeout(struct uart_port *port, unsigned int cflag, | |
376 | unsigned int baud); | |
606d099c AC |
377 | unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
378 | struct ktermios *old, unsigned int min, | |
1da177e4 LT |
379 | unsigned int max); |
380 | unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud); | |
381 | ||
382 | /* | |
383 | * Console helpers. | |
384 | */ | |
385 | struct uart_port *uart_get_console(struct uart_port *ports, int nr, | |
386 | struct console *c); | |
387 | void uart_parse_options(char *options, int *baud, int *parity, int *bits, | |
388 | int *flow); | |
389 | int uart_set_options(struct uart_port *port, struct console *co, int baud, | |
390 | int parity, int bits, int flow); | |
391 | struct tty_driver *uart_console_device(struct console *co, int *index); | |
d358788f RK |
392 | void uart_console_write(struct uart_port *port, const char *s, |
393 | unsigned int count, | |
394 | void (*putchar)(struct uart_port *, int)); | |
1da177e4 LT |
395 | |
396 | /* | |
397 | * Port/driver registration/removal | |
398 | */ | |
399 | int uart_register_driver(struct uart_driver *uart); | |
400 | void uart_unregister_driver(struct uart_driver *uart); | |
1da177e4 LT |
401 | int uart_add_one_port(struct uart_driver *reg, struct uart_port *port); |
402 | int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port); | |
403 | int uart_match_port(struct uart_port *port1, struct uart_port *port2); | |
404 | ||
405 | /* | |
406 | * Power Management | |
407 | */ | |
408 | int uart_suspend_port(struct uart_driver *reg, struct uart_port *port); | |
409 | int uart_resume_port(struct uart_driver *reg, struct uart_port *port); | |
410 | ||
411 | #define uart_circ_empty(circ) ((circ)->head == (circ)->tail) | |
412 | #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0) | |
413 | ||
414 | #define uart_circ_chars_pending(circ) \ | |
415 | (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE)) | |
416 | ||
417 | #define uart_circ_chars_free(circ) \ | |
418 | (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE)) | |
419 | ||
420 | #define uart_tx_stopped(port) \ | |
421 | ((port)->info->tty->stopped || (port)->info->tty->hw_stopped) | |
422 | ||
423 | /* | |
424 | * The following are helper functions for the low level drivers. | |
425 | */ | |
1da177e4 | 426 | static inline int |
7d12e780 | 427 | uart_handle_sysrq_char(struct uart_port *port, unsigned int ch) |
1da177e4 | 428 | { |
93c37f29 | 429 | #ifdef SUPPORT_SYSRQ |
1da177e4 LT |
430 | if (port->sysrq) { |
431 | if (ch && time_before(jiffies, port->sysrq)) { | |
7d12e780 | 432 | handle_sysrq(ch, port->info->tty); |
1da177e4 LT |
433 | port->sysrq = 0; |
434 | return 1; | |
435 | } | |
436 | port->sysrq = 0; | |
437 | } | |
93c37f29 | 438 | #endif |
1da177e4 LT |
439 | return 0; |
440 | } | |
4e149184 | 441 | #ifndef SUPPORT_SYSRQ |
7d12e780 | 442 | #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0) |
4e149184 | 443 | #endif |
1da177e4 LT |
444 | |
445 | /* | |
446 | * We do the SysRQ and SAK checking like this... | |
447 | */ | |
448 | static inline int uart_handle_break(struct uart_port *port) | |
449 | { | |
450 | struct uart_info *info = port->info; | |
451 | #ifdef SUPPORT_SYSRQ | |
452 | if (port->cons && port->cons->index == port->line) { | |
453 | if (!port->sysrq) { | |
454 | port->sysrq = jiffies + HZ*5; | |
455 | return 1; | |
456 | } | |
457 | port->sysrq = 0; | |
458 | } | |
459 | #endif | |
27ae7a74 | 460 | if (port->flags & UPF_SAK) |
1da177e4 LT |
461 | do_SAK(info->tty); |
462 | return 0; | |
463 | } | |
464 | ||
465 | /** | |
466 | * uart_handle_dcd_change - handle a change of carrier detect state | |
467 | * @port: uart_port structure for the open port | |
468 | * @status: new carrier detect status, nonzero if active | |
469 | */ | |
470 | static inline void | |
471 | uart_handle_dcd_change(struct uart_port *port, unsigned int status) | |
472 | { | |
473 | struct uart_info *info = port->info; | |
474 | ||
475 | port->icount.dcd++; | |
476 | ||
477 | #ifdef CONFIG_HARD_PPS | |
478 | if ((port->flags & UPF_HARDPPS_CD) && status) | |
479 | hardpps(); | |
480 | #endif | |
481 | ||
482 | if (info->flags & UIF_CHECK_CD) { | |
483 | if (status) | |
484 | wake_up_interruptible(&info->open_wait); | |
485 | else if (info->tty) | |
486 | tty_hangup(info->tty); | |
487 | } | |
488 | } | |
489 | ||
490 | /** | |
491 | * uart_handle_cts_change - handle a change of clear-to-send state | |
492 | * @port: uart_port structure for the open port | |
493 | * @status: new clear to send status, nonzero if active | |
494 | */ | |
495 | static inline void | |
496 | uart_handle_cts_change(struct uart_port *port, unsigned int status) | |
497 | { | |
498 | struct uart_info *info = port->info; | |
499 | struct tty_struct *tty = info->tty; | |
500 | ||
501 | port->icount.cts++; | |
502 | ||
503 | if (info->flags & UIF_CTS_FLOW) { | |
504 | if (tty->hw_stopped) { | |
505 | if (status) { | |
506 | tty->hw_stopped = 0; | |
b129a8cc | 507 | port->ops->start_tx(port); |
1da177e4 LT |
508 | uart_write_wakeup(port); |
509 | } | |
510 | } else { | |
511 | if (!status) { | |
512 | tty->hw_stopped = 1; | |
b129a8cc | 513 | port->ops->stop_tx(port); |
1da177e4 LT |
514 | } |
515 | } | |
516 | } | |
517 | } | |
518 | ||
05ab3014 RK |
519 | #include <linux/tty_flip.h> |
520 | ||
521 | static inline void | |
522 | uart_insert_char(struct uart_port *port, unsigned int status, | |
523 | unsigned int overrun, unsigned int ch, unsigned int flag) | |
524 | { | |
525 | struct tty_struct *tty = port->info->tty; | |
526 | ||
527 | if ((status & port->ignore_status_mask & ~overrun) == 0) | |
528 | tty_insert_flip_char(tty, ch, flag); | |
529 | ||
530 | /* | |
531 | * Overrun is special. Since it's reported immediately, | |
532 | * it doesn't affect the current character. | |
533 | */ | |
534 | if (status & ~port->ignore_status_mask & overrun) | |
535 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
536 | } | |
537 | ||
1da177e4 LT |
538 | /* |
539 | * UART_ENABLE_MS - determine if port should enable modem status irqs | |
540 | */ | |
541 | #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \ | |
542 | (cflag) & CRTSCTS || \ | |
543 | !((cflag) & CLOCAL)) | |
544 | ||
545 | #endif | |
546 | ||
547 | #endif /* LINUX_SERIAL_CORE_H */ |