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1da177e4 LT |
1 | /* |
2 | * linux/drivers/net/irda/sa1100_ir.c | |
3 | * | |
4 | * Copyright (C) 2000-2001 Russell King | |
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 version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * Infra-red driver for the StrongARM SA1100 embedded microprocessor | |
11 | * | |
12 | * Note that we don't have to worry about the SA1111's DMA bugs in here, | |
13 | * so we use the straight forward dma_map_* functions with a null pointer. | |
14 | * | |
15 | * This driver takes one kernel command line parameter, sa1100ir=, with | |
16 | * the following options: | |
17 | * max_rate:baudrate - set the maximum baud rate | |
18 | * power_leve:level - set the transmitter power level | |
19 | * tx_lpm:0|1 - set transmit low power mode | |
20 | */ | |
1da177e4 LT |
21 | #include <linux/module.h> |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/rtnetlink.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/delay.h> | |
d052d1be | 31 | #include <linux/platform_device.h> |
1da177e4 LT |
32 | #include <linux/dma-mapping.h> |
33 | ||
34 | #include <net/irda/irda.h> | |
35 | #include <net/irda/wrapper.h> | |
36 | #include <net/irda/irda_device.h> | |
37 | ||
38 | #include <asm/irq.h> | |
d281bc9d | 39 | #include <mach/dma.h> |
a09e64fb | 40 | #include <mach/hardware.h> |
1da177e4 LT |
41 | #include <asm/mach/irda.h> |
42 | ||
43 | static int power_level = 3; | |
44 | static int tx_lpm; | |
45 | static int max_rate = 4000000; | |
46 | ||
47 | struct sa1100_irda { | |
48 | unsigned char hscr0; | |
49 | unsigned char utcr4; | |
50 | unsigned char power; | |
51 | unsigned char open; | |
52 | ||
53 | int speed; | |
54 | int newspeed; | |
55 | ||
56 | struct sk_buff *txskb; | |
57 | struct sk_buff *rxskb; | |
58 | dma_addr_t txbuf_dma; | |
59 | dma_addr_t rxbuf_dma; | |
60 | dma_regs_t *txdma; | |
61 | dma_regs_t *rxdma; | |
62 | ||
1da177e4 LT |
63 | struct device *dev; |
64 | struct irda_platform_data *pdata; | |
65 | struct irlap_cb *irlap; | |
66 | struct qos_info qos; | |
67 | ||
68 | iobuff_t tx_buff; | |
69 | iobuff_t rx_buff; | |
70 | }; | |
71 | ||
72 | #define IS_FIR(si) ((si)->speed >= 4000000) | |
73 | ||
74 | #define HPSIR_MAX_RXLEN 2047 | |
75 | ||
76 | /* | |
77 | * Allocate and map the receive buffer, unless it is already allocated. | |
78 | */ | |
79 | static int sa1100_irda_rx_alloc(struct sa1100_irda *si) | |
80 | { | |
81 | if (si->rxskb) | |
82 | return 0; | |
83 | ||
84 | si->rxskb = alloc_skb(HPSIR_MAX_RXLEN + 1, GFP_ATOMIC); | |
85 | ||
86 | if (!si->rxskb) { | |
87 | printk(KERN_ERR "sa1100_ir: out of memory for RX SKB\n"); | |
88 | return -ENOMEM; | |
89 | } | |
90 | ||
91 | /* | |
92 | * Align any IP headers that may be contained | |
93 | * within the frame. | |
94 | */ | |
95 | skb_reserve(si->rxskb, 1); | |
96 | ||
97 | si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data, | |
98 | HPSIR_MAX_RXLEN, | |
99 | DMA_FROM_DEVICE); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | /* | |
104 | * We want to get here as soon as possible, and get the receiver setup. | |
105 | * We use the existing buffer. | |
106 | */ | |
107 | static void sa1100_irda_rx_dma_start(struct sa1100_irda *si) | |
108 | { | |
109 | if (!si->rxskb) { | |
110 | printk(KERN_ERR "sa1100_ir: rx buffer went missing\n"); | |
111 | return; | |
112 | } | |
113 | ||
114 | /* | |
115 | * First empty receive FIFO | |
116 | */ | |
117 | Ser2HSCR0 = si->hscr0 | HSCR0_HSSP; | |
118 | ||
119 | /* | |
120 | * Enable the DMA, receiver and receive interrupt. | |
121 | */ | |
122 | sa1100_clear_dma(si->rxdma); | |
123 | sa1100_start_dma(si->rxdma, si->rxbuf_dma, HPSIR_MAX_RXLEN); | |
124 | Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_RXE; | |
125 | } | |
126 | ||
127 | /* | |
128 | * Set the IrDA communications speed. | |
129 | */ | |
130 | static int sa1100_irda_set_speed(struct sa1100_irda *si, int speed) | |
131 | { | |
132 | unsigned long flags; | |
133 | int brd, ret = -EINVAL; | |
134 | ||
135 | switch (speed) { | |
136 | case 9600: case 19200: case 38400: | |
137 | case 57600: case 115200: | |
138 | brd = 3686400 / (16 * speed) - 1; | |
139 | ||
140 | /* | |
141 | * Stop the receive DMA. | |
142 | */ | |
143 | if (IS_FIR(si)) | |
144 | sa1100_stop_dma(si->rxdma); | |
145 | ||
146 | local_irq_save(flags); | |
147 | ||
148 | Ser2UTCR3 = 0; | |
149 | Ser2HSCR0 = HSCR0_UART; | |
150 | ||
151 | Ser2UTCR1 = brd >> 8; | |
152 | Ser2UTCR2 = brd; | |
153 | ||
154 | /* | |
155 | * Clear status register | |
156 | */ | |
157 | Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID; | |
158 | Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE; | |
159 | ||
160 | if (si->pdata->set_speed) | |
161 | si->pdata->set_speed(si->dev, speed); | |
162 | ||
163 | si->speed = speed; | |
164 | ||
165 | local_irq_restore(flags); | |
166 | ret = 0; | |
167 | break; | |
168 | ||
169 | case 4000000: | |
170 | local_irq_save(flags); | |
171 | ||
172 | si->hscr0 = 0; | |
173 | ||
174 | Ser2HSSR0 = 0xff; | |
175 | Ser2HSCR0 = si->hscr0 | HSCR0_HSSP; | |
176 | Ser2UTCR3 = 0; | |
177 | ||
178 | si->speed = speed; | |
179 | ||
180 | if (si->pdata->set_speed) | |
181 | si->pdata->set_speed(si->dev, speed); | |
182 | ||
183 | sa1100_irda_rx_alloc(si); | |
184 | sa1100_irda_rx_dma_start(si); | |
185 | ||
186 | local_irq_restore(flags); | |
187 | ||
188 | break; | |
189 | ||
190 | default: | |
191 | break; | |
192 | } | |
193 | ||
194 | return ret; | |
195 | } | |
196 | ||
197 | /* | |
198 | * Control the power state of the IrDA transmitter. | |
199 | * State: | |
200 | * 0 - off | |
201 | * 1 - short range, lowest power | |
202 | * 2 - medium range, medium power | |
203 | * 3 - maximum range, high power | |
204 | * | |
205 | * Currently, only assabet is known to support this. | |
206 | */ | |
207 | static int | |
208 | __sa1100_irda_set_power(struct sa1100_irda *si, unsigned int state) | |
209 | { | |
210 | int ret = 0; | |
211 | if (si->pdata->set_power) | |
212 | ret = si->pdata->set_power(si->dev, state); | |
213 | return ret; | |
214 | } | |
215 | ||
216 | static inline int | |
217 | sa1100_set_power(struct sa1100_irda *si, unsigned int state) | |
218 | { | |
219 | int ret; | |
220 | ||
221 | ret = __sa1100_irda_set_power(si, state); | |
222 | if (ret == 0) | |
223 | si->power = state; | |
224 | ||
225 | return ret; | |
226 | } | |
227 | ||
228 | static int sa1100_irda_startup(struct sa1100_irda *si) | |
229 | { | |
230 | int ret; | |
231 | ||
232 | /* | |
233 | * Ensure that the ports for this device are setup correctly. | |
234 | */ | |
235 | if (si->pdata->startup) | |
236 | si->pdata->startup(si->dev); | |
237 | ||
238 | /* | |
239 | * Configure PPC for IRDA - we want to drive TXD2 low. | |
240 | * We also want to drive this pin low during sleep. | |
241 | */ | |
242 | PPSR &= ~PPC_TXD2; | |
243 | PSDR &= ~PPC_TXD2; | |
244 | PPDR |= PPC_TXD2; | |
245 | ||
246 | /* | |
247 | * Enable HP-SIR modulation, and ensure that the port is disabled. | |
248 | */ | |
249 | Ser2UTCR3 = 0; | |
250 | Ser2HSCR0 = HSCR0_UART; | |
251 | Ser2UTCR4 = si->utcr4; | |
252 | Ser2UTCR0 = UTCR0_8BitData; | |
253 | Ser2HSCR2 = HSCR2_TrDataH | HSCR2_RcDataL; | |
254 | ||
255 | /* | |
256 | * Clear status register | |
257 | */ | |
258 | Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID; | |
259 | ||
260 | ret = sa1100_irda_set_speed(si, si->speed = 9600); | |
261 | if (ret) { | |
262 | Ser2UTCR3 = 0; | |
263 | Ser2HSCR0 = 0; | |
264 | ||
265 | if (si->pdata->shutdown) | |
266 | si->pdata->shutdown(si->dev); | |
267 | } | |
268 | ||
269 | return ret; | |
270 | } | |
271 | ||
272 | static void sa1100_irda_shutdown(struct sa1100_irda *si) | |
273 | { | |
274 | /* | |
275 | * Stop all DMA activity. | |
276 | */ | |
277 | sa1100_stop_dma(si->rxdma); | |
278 | sa1100_stop_dma(si->txdma); | |
279 | ||
280 | /* Disable the port. */ | |
281 | Ser2UTCR3 = 0; | |
282 | Ser2HSCR0 = 0; | |
283 | ||
284 | if (si->pdata->shutdown) | |
285 | si->pdata->shutdown(si->dev); | |
286 | } | |
287 | ||
288 | #ifdef CONFIG_PM | |
289 | /* | |
290 | * Suspend the IrDA interface. | |
291 | */ | |
3ae5eaec | 292 | static int sa1100_irda_suspend(struct platform_device *pdev, pm_message_t state) |
1da177e4 | 293 | { |
3ae5eaec | 294 | struct net_device *dev = platform_get_drvdata(pdev); |
1da177e4 LT |
295 | struct sa1100_irda *si; |
296 | ||
9480e307 | 297 | if (!dev) |
1da177e4 LT |
298 | return 0; |
299 | ||
4cf1653a | 300 | si = netdev_priv(dev); |
1da177e4 LT |
301 | if (si->open) { |
302 | /* | |
303 | * Stop the transmit queue | |
304 | */ | |
305 | netif_device_detach(dev); | |
306 | disable_irq(dev->irq); | |
307 | sa1100_irda_shutdown(si); | |
308 | __sa1100_irda_set_power(si, 0); | |
309 | } | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | /* | |
315 | * Resume the IrDA interface. | |
316 | */ | |
3ae5eaec | 317 | static int sa1100_irda_resume(struct platform_device *pdev) |
1da177e4 | 318 | { |
3ae5eaec | 319 | struct net_device *dev = platform_get_drvdata(pdev); |
1da177e4 LT |
320 | struct sa1100_irda *si; |
321 | ||
9480e307 | 322 | if (!dev) |
1da177e4 LT |
323 | return 0; |
324 | ||
4cf1653a | 325 | si = netdev_priv(dev); |
1da177e4 LT |
326 | if (si->open) { |
327 | /* | |
328 | * If we missed a speed change, initialise at the new speed | |
329 | * directly. It is debatable whether this is actually | |
330 | * required, but in the interests of continuing from where | |
331 | * we left off it is desireable. The converse argument is | |
332 | * that we should re-negotiate at 9600 baud again. | |
333 | */ | |
334 | if (si->newspeed) { | |
335 | si->speed = si->newspeed; | |
336 | si->newspeed = 0; | |
337 | } | |
338 | ||
339 | sa1100_irda_startup(si); | |
340 | __sa1100_irda_set_power(si, si->power); | |
341 | enable_irq(dev->irq); | |
342 | ||
343 | /* | |
344 | * This automatically wakes up the queue | |
345 | */ | |
346 | netif_device_attach(dev); | |
347 | } | |
348 | ||
349 | return 0; | |
350 | } | |
351 | #else | |
352 | #define sa1100_irda_suspend NULL | |
353 | #define sa1100_irda_resume NULL | |
354 | #endif | |
355 | ||
356 | /* | |
357 | * HP-SIR format interrupt service routines. | |
358 | */ | |
359 | static void sa1100_irda_hpsir_irq(struct net_device *dev) | |
360 | { | |
4cf1653a | 361 | struct sa1100_irda *si = netdev_priv(dev); |
1da177e4 LT |
362 | int status; |
363 | ||
364 | status = Ser2UTSR0; | |
365 | ||
366 | /* | |
367 | * Deal with any receive errors first. The bytes in error may be | |
368 | * the only bytes in the receive FIFO, so we do this first. | |
369 | */ | |
370 | while (status & UTSR0_EIF) { | |
371 | int stat, data; | |
372 | ||
373 | stat = Ser2UTSR1; | |
374 | data = Ser2UTDR; | |
375 | ||
376 | if (stat & (UTSR1_FRE | UTSR1_ROR)) { | |
af049081 | 377 | dev->stats.rx_errors++; |
1da177e4 | 378 | if (stat & UTSR1_FRE) |
af049081 | 379 | dev->stats.rx_frame_errors++; |
1da177e4 | 380 | if (stat & UTSR1_ROR) |
af049081 | 381 | dev->stats.rx_fifo_errors++; |
1da177e4 | 382 | } else |
af049081 | 383 | async_unwrap_char(dev, &dev->stats, &si->rx_buff, data); |
1da177e4 LT |
384 | |
385 | status = Ser2UTSR0; | |
386 | } | |
387 | ||
388 | /* | |
389 | * We must clear certain bits. | |
390 | */ | |
391 | Ser2UTSR0 = status & (UTSR0_RID | UTSR0_RBB | UTSR0_REB); | |
392 | ||
393 | if (status & UTSR0_RFS) { | |
394 | /* | |
395 | * There are at least 4 bytes in the FIFO. Read 3 bytes | |
396 | * and leave the rest to the block below. | |
397 | */ | |
af049081 SH |
398 | async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR); |
399 | async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR); | |
400 | async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR); | |
1da177e4 LT |
401 | } |
402 | ||
403 | if (status & (UTSR0_RFS | UTSR0_RID)) { | |
404 | /* | |
405 | * Fifo contains more than 1 character. | |
406 | */ | |
407 | do { | |
af049081 | 408 | async_unwrap_char(dev, &dev->stats, &si->rx_buff, |
1da177e4 LT |
409 | Ser2UTDR); |
410 | } while (Ser2UTSR1 & UTSR1_RNE); | |
411 | ||
1da177e4 LT |
412 | } |
413 | ||
414 | if (status & UTSR0_TFS && si->tx_buff.len) { | |
415 | /* | |
416 | * Transmitter FIFO is not full | |
417 | */ | |
418 | do { | |
419 | Ser2UTDR = *si->tx_buff.data++; | |
420 | si->tx_buff.len -= 1; | |
421 | } while (Ser2UTSR1 & UTSR1_TNF && si->tx_buff.len); | |
422 | ||
423 | if (si->tx_buff.len == 0) { | |
af049081 SH |
424 | dev->stats.tx_packets++; |
425 | dev->stats.tx_bytes += si->tx_buff.data - | |
1da177e4 LT |
426 | si->tx_buff.head; |
427 | ||
428 | /* | |
429 | * We need to ensure that the transmitter has | |
430 | * finished. | |
431 | */ | |
432 | do | |
433 | rmb(); | |
434 | while (Ser2UTSR1 & UTSR1_TBY); | |
435 | ||
436 | /* | |
437 | * Ok, we've finished transmitting. Now enable | |
438 | * the receiver. Sometimes we get a receive IRQ | |
439 | * immediately after a transmit... | |
440 | */ | |
441 | Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID; | |
442 | Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE; | |
443 | ||
444 | if (si->newspeed) { | |
445 | sa1100_irda_set_speed(si, si->newspeed); | |
446 | si->newspeed = 0; | |
447 | } | |
448 | ||
449 | /* I'm hungry! */ | |
450 | netif_wake_queue(dev); | |
451 | } | |
452 | } | |
453 | } | |
454 | ||
455 | static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev) | |
456 | { | |
457 | struct sk_buff *skb = si->rxskb; | |
458 | dma_addr_t dma_addr; | |
459 | unsigned int len, stat, data; | |
460 | ||
461 | if (!skb) { | |
462 | printk(KERN_ERR "sa1100_ir: SKB is NULL!\n"); | |
463 | return; | |
464 | } | |
465 | ||
466 | /* | |
467 | * Get the current data position. | |
468 | */ | |
469 | dma_addr = sa1100_get_dma_pos(si->rxdma); | |
470 | len = dma_addr - si->rxbuf_dma; | |
471 | if (len > HPSIR_MAX_RXLEN) | |
472 | len = HPSIR_MAX_RXLEN; | |
473 | dma_unmap_single(si->dev, si->rxbuf_dma, len, DMA_FROM_DEVICE); | |
474 | ||
475 | do { | |
476 | /* | |
477 | * Read Status, and then Data. | |
478 | */ | |
479 | stat = Ser2HSSR1; | |
480 | rmb(); | |
481 | data = Ser2HSDR; | |
482 | ||
483 | if (stat & (HSSR1_CRE | HSSR1_ROR)) { | |
af049081 | 484 | dev->stats.rx_errors++; |
1da177e4 | 485 | if (stat & HSSR1_CRE) |
af049081 | 486 | dev->stats.rx_crc_errors++; |
1da177e4 | 487 | if (stat & HSSR1_ROR) |
af049081 | 488 | dev->stats.rx_frame_errors++; |
1da177e4 LT |
489 | } else |
490 | skb->data[len++] = data; | |
491 | ||
492 | /* | |
493 | * If we hit the end of frame, there's | |
494 | * no point in continuing. | |
495 | */ | |
496 | if (stat & HSSR1_EOF) | |
497 | break; | |
498 | } while (Ser2HSSR0 & HSSR0_EIF); | |
499 | ||
500 | if (stat & HSSR1_EOF) { | |
501 | si->rxskb = NULL; | |
502 | ||
503 | skb_put(skb, len); | |
504 | skb->dev = dev; | |
459a98ed | 505 | skb_reset_mac_header(skb); |
1da177e4 | 506 | skb->protocol = htons(ETH_P_IRDA); |
af049081 SH |
507 | dev->stats.rx_packets++; |
508 | dev->stats.rx_bytes += len; | |
1da177e4 LT |
509 | |
510 | /* | |
511 | * Before we pass the buffer up, allocate a new one. | |
512 | */ | |
513 | sa1100_irda_rx_alloc(si); | |
514 | ||
515 | netif_rx(skb); | |
1da177e4 LT |
516 | } else { |
517 | /* | |
518 | * Remap the buffer. | |
519 | */ | |
520 | si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data, | |
521 | HPSIR_MAX_RXLEN, | |
522 | DMA_FROM_DEVICE); | |
523 | } | |
524 | } | |
525 | ||
526 | /* | |
527 | * FIR format interrupt service routine. We only have to | |
528 | * handle RX events; transmit events go via the TX DMA handler. | |
529 | * | |
530 | * No matter what, we disable RX, process, and the restart RX. | |
531 | */ | |
532 | static void sa1100_irda_fir_irq(struct net_device *dev) | |
533 | { | |
4cf1653a | 534 | struct sa1100_irda *si = netdev_priv(dev); |
1da177e4 LT |
535 | |
536 | /* | |
537 | * Stop RX DMA | |
538 | */ | |
539 | sa1100_stop_dma(si->rxdma); | |
540 | ||
541 | /* | |
542 | * Framing error - we throw away the packet completely. | |
543 | * Clearing RXE flushes the error conditions and data | |
544 | * from the fifo. | |
545 | */ | |
546 | if (Ser2HSSR0 & (HSSR0_FRE | HSSR0_RAB)) { | |
af049081 | 547 | dev->stats.rx_errors++; |
1da177e4 LT |
548 | |
549 | if (Ser2HSSR0 & HSSR0_FRE) | |
af049081 | 550 | dev->stats.rx_frame_errors++; |
1da177e4 LT |
551 | |
552 | /* | |
553 | * Clear out the DMA... | |
554 | */ | |
555 | Ser2HSCR0 = si->hscr0 | HSCR0_HSSP; | |
556 | ||
557 | /* | |
558 | * Clear selected status bits now, so we | |
559 | * don't miss them next time around. | |
560 | */ | |
561 | Ser2HSSR0 = HSSR0_FRE | HSSR0_RAB; | |
562 | } | |
563 | ||
564 | /* | |
565 | * Deal with any receive errors. The any of the lowest | |
566 | * 8 bytes in the FIFO may contain an error. We must read | |
567 | * them one by one. The "error" could even be the end of | |
568 | * packet! | |
569 | */ | |
570 | if (Ser2HSSR0 & HSSR0_EIF) | |
571 | sa1100_irda_fir_error(si, dev); | |
572 | ||
573 | /* | |
574 | * No matter what happens, we must restart reception. | |
575 | */ | |
576 | sa1100_irda_rx_dma_start(si); | |
577 | } | |
578 | ||
7d12e780 | 579 | static irqreturn_t sa1100_irda_irq(int irq, void *dev_id) |
1da177e4 LT |
580 | { |
581 | struct net_device *dev = dev_id; | |
4cf1653a | 582 | if (IS_FIR(((struct sa1100_irda *)netdev_priv(dev)))) |
1da177e4 LT |
583 | sa1100_irda_fir_irq(dev); |
584 | else | |
585 | sa1100_irda_hpsir_irq(dev); | |
586 | return IRQ_HANDLED; | |
587 | } | |
588 | ||
589 | /* | |
590 | * TX DMA completion handler. | |
591 | */ | |
592 | static void sa1100_irda_txdma_irq(void *id) | |
593 | { | |
594 | struct net_device *dev = id; | |
4cf1653a | 595 | struct sa1100_irda *si = netdev_priv(dev); |
1da177e4 LT |
596 | struct sk_buff *skb = si->txskb; |
597 | ||
598 | si->txskb = NULL; | |
599 | ||
600 | /* | |
601 | * Wait for the transmission to complete. Unfortunately, | |
602 | * the hardware doesn't give us an interrupt to indicate | |
603 | * "end of frame". | |
604 | */ | |
605 | do | |
606 | rmb(); | |
607 | while (!(Ser2HSSR0 & HSSR0_TUR) || Ser2HSSR1 & HSSR1_TBY); | |
608 | ||
609 | /* | |
610 | * Clear the transmit underrun bit. | |
611 | */ | |
612 | Ser2HSSR0 = HSSR0_TUR; | |
613 | ||
614 | /* | |
615 | * Do we need to change speed? Note that we're lazy | |
616 | * here - we don't free the old rxskb. We don't need | |
617 | * to allocate a buffer either. | |
618 | */ | |
619 | if (si->newspeed) { | |
620 | sa1100_irda_set_speed(si, si->newspeed); | |
621 | si->newspeed = 0; | |
622 | } | |
623 | ||
624 | /* | |
625 | * Start reception. This disables the transmitter for | |
626 | * us. This will be using the existing RX buffer. | |
627 | */ | |
628 | sa1100_irda_rx_dma_start(si); | |
629 | ||
630 | /* | |
631 | * Account and free the packet. | |
632 | */ | |
633 | if (skb) { | |
634 | dma_unmap_single(si->dev, si->txbuf_dma, skb->len, DMA_TO_DEVICE); | |
af049081 SH |
635 | dev->stats.tx_packets ++; |
636 | dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
637 | dev_kfree_skb_irq(skb); |
638 | } | |
639 | ||
640 | /* | |
641 | * Make sure that the TX queue is available for sending | |
642 | * (for retries). TX has priority over RX at all times. | |
643 | */ | |
644 | netif_wake_queue(dev); | |
645 | } | |
646 | ||
647 | static int sa1100_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev) | |
648 | { | |
4cf1653a | 649 | struct sa1100_irda *si = netdev_priv(dev); |
1da177e4 LT |
650 | int speed = irda_get_next_speed(skb); |
651 | ||
652 | /* | |
653 | * Does this packet contain a request to change the interface | |
654 | * speed? If so, remember it until we complete the transmission | |
655 | * of this frame. | |
656 | */ | |
657 | if (speed != si->speed && speed != -1) | |
658 | si->newspeed = speed; | |
659 | ||
660 | /* | |
661 | * If this is an empty frame, we can bypass a lot. | |
662 | */ | |
663 | if (skb->len == 0) { | |
664 | if (si->newspeed) { | |
665 | si->newspeed = 0; | |
666 | sa1100_irda_set_speed(si, speed); | |
667 | } | |
668 | dev_kfree_skb(skb); | |
6ed10654 | 669 | return NETDEV_TX_OK; |
1da177e4 LT |
670 | } |
671 | ||
672 | if (!IS_FIR(si)) { | |
673 | netif_stop_queue(dev); | |
674 | ||
675 | si->tx_buff.data = si->tx_buff.head; | |
676 | si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data, | |
677 | si->tx_buff.truesize); | |
678 | ||
679 | /* | |
680 | * Set the transmit interrupt enable. This will fire | |
681 | * off an interrupt immediately. Note that we disable | |
682 | * the receiver so we won't get spurious characteres | |
683 | * received. | |
684 | */ | |
685 | Ser2UTCR3 = UTCR3_TIE | UTCR3_TXE; | |
686 | ||
687 | dev_kfree_skb(skb); | |
688 | } else { | |
689 | int mtt = irda_get_mtt(skb); | |
690 | ||
691 | /* | |
692 | * We must not be transmitting... | |
693 | */ | |
5d9428de | 694 | BUG_ON(si->txskb); |
1da177e4 LT |
695 | |
696 | netif_stop_queue(dev); | |
697 | ||
698 | si->txskb = skb; | |
699 | si->txbuf_dma = dma_map_single(si->dev, skb->data, | |
700 | skb->len, DMA_TO_DEVICE); | |
701 | ||
702 | sa1100_start_dma(si->txdma, si->txbuf_dma, skb->len); | |
703 | ||
704 | /* | |
705 | * If we have a mean turn-around time, impose the specified | |
706 | * specified delay. We could shorten this by timing from | |
707 | * the point we received the packet. | |
708 | */ | |
709 | if (mtt) | |
710 | udelay(mtt); | |
711 | ||
712 | Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_TXE; | |
713 | } | |
714 | ||
715 | dev->trans_start = jiffies; | |
716 | ||
6ed10654 | 717 | return NETDEV_TX_OK; |
1da177e4 LT |
718 | } |
719 | ||
720 | static int | |
721 | sa1100_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd) | |
722 | { | |
723 | struct if_irda_req *rq = (struct if_irda_req *)ifreq; | |
4cf1653a | 724 | struct sa1100_irda *si = netdev_priv(dev); |
1da177e4 LT |
725 | int ret = -EOPNOTSUPP; |
726 | ||
727 | switch (cmd) { | |
728 | case SIOCSBANDWIDTH: | |
729 | if (capable(CAP_NET_ADMIN)) { | |
730 | /* | |
731 | * We are unable to set the speed if the | |
732 | * device is not running. | |
733 | */ | |
734 | if (si->open) { | |
735 | ret = sa1100_irda_set_speed(si, | |
736 | rq->ifr_baudrate); | |
737 | } else { | |
738 | printk("sa1100_irda_ioctl: SIOCSBANDWIDTH: !netif_running\n"); | |
739 | ret = 0; | |
740 | } | |
741 | } | |
742 | break; | |
743 | ||
744 | case SIOCSMEDIABUSY: | |
745 | ret = -EPERM; | |
746 | if (capable(CAP_NET_ADMIN)) { | |
747 | irda_device_set_media_busy(dev, TRUE); | |
748 | ret = 0; | |
749 | } | |
750 | break; | |
751 | ||
752 | case SIOCGRECEIVING: | |
753 | rq->ifr_receiving = IS_FIR(si) ? 0 | |
754 | : si->rx_buff.state != OUTSIDE_FRAME; | |
755 | break; | |
756 | ||
757 | default: | |
758 | break; | |
759 | } | |
760 | ||
761 | return ret; | |
762 | } | |
763 | ||
1da177e4 LT |
764 | static int sa1100_irda_start(struct net_device *dev) |
765 | { | |
4cf1653a | 766 | struct sa1100_irda *si = netdev_priv(dev); |
1da177e4 LT |
767 | int err; |
768 | ||
769 | si->speed = 9600; | |
770 | ||
771 | err = request_irq(dev->irq, sa1100_irda_irq, 0, dev->name, dev); | |
772 | if (err) | |
773 | goto err_irq; | |
774 | ||
775 | err = sa1100_request_dma(DMA_Ser2HSSPRd, "IrDA receive", | |
776 | NULL, NULL, &si->rxdma); | |
777 | if (err) | |
778 | goto err_rx_dma; | |
779 | ||
780 | err = sa1100_request_dma(DMA_Ser2HSSPWr, "IrDA transmit", | |
781 | sa1100_irda_txdma_irq, dev, &si->txdma); | |
782 | if (err) | |
783 | goto err_tx_dma; | |
784 | ||
785 | /* | |
786 | * The interrupt must remain disabled for now. | |
787 | */ | |
788 | disable_irq(dev->irq); | |
789 | ||
790 | /* | |
791 | * Setup the serial port for the specified speed. | |
792 | */ | |
793 | err = sa1100_irda_startup(si); | |
794 | if (err) | |
795 | goto err_startup; | |
796 | ||
797 | /* | |
798 | * Open a new IrLAP layer instance. | |
799 | */ | |
800 | si->irlap = irlap_open(dev, &si->qos, "sa1100"); | |
801 | err = -ENOMEM; | |
802 | if (!si->irlap) | |
803 | goto err_irlap; | |
804 | ||
805 | /* | |
806 | * Now enable the interrupt and start the queue | |
807 | */ | |
808 | si->open = 1; | |
809 | sa1100_set_power(si, power_level); /* low power mode */ | |
810 | enable_irq(dev->irq); | |
811 | netif_start_queue(dev); | |
812 | return 0; | |
813 | ||
814 | err_irlap: | |
815 | si->open = 0; | |
816 | sa1100_irda_shutdown(si); | |
817 | err_startup: | |
818 | sa1100_free_dma(si->txdma); | |
819 | err_tx_dma: | |
820 | sa1100_free_dma(si->rxdma); | |
821 | err_rx_dma: | |
822 | free_irq(dev->irq, dev); | |
823 | err_irq: | |
824 | return err; | |
825 | } | |
826 | ||
827 | static int sa1100_irda_stop(struct net_device *dev) | |
828 | { | |
4cf1653a | 829 | struct sa1100_irda *si = netdev_priv(dev); |
1da177e4 LT |
830 | |
831 | disable_irq(dev->irq); | |
832 | sa1100_irda_shutdown(si); | |
833 | ||
834 | /* | |
835 | * If we have been doing DMA receive, make sure we | |
836 | * tidy that up cleanly. | |
837 | */ | |
838 | if (si->rxskb) { | |
839 | dma_unmap_single(si->dev, si->rxbuf_dma, HPSIR_MAX_RXLEN, | |
840 | DMA_FROM_DEVICE); | |
841 | dev_kfree_skb(si->rxskb); | |
842 | si->rxskb = NULL; | |
843 | } | |
844 | ||
845 | /* Stop IrLAP */ | |
846 | if (si->irlap) { | |
847 | irlap_close(si->irlap); | |
848 | si->irlap = NULL; | |
849 | } | |
850 | ||
851 | netif_stop_queue(dev); | |
852 | si->open = 0; | |
853 | ||
854 | /* | |
855 | * Free resources | |
856 | */ | |
857 | sa1100_free_dma(si->txdma); | |
858 | sa1100_free_dma(si->rxdma); | |
859 | free_irq(dev->irq, dev); | |
860 | ||
861 | sa1100_set_power(si, 0); | |
862 | ||
863 | return 0; | |
864 | } | |
865 | ||
866 | static int sa1100_irda_init_iobuf(iobuff_t *io, int size) | |
867 | { | |
868 | io->head = kmalloc(size, GFP_KERNEL | GFP_DMA); | |
869 | if (io->head != NULL) { | |
870 | io->truesize = size; | |
871 | io->in_frame = FALSE; | |
872 | io->state = OUTSIDE_FRAME; | |
873 | io->data = io->head; | |
874 | } | |
875 | return io->head ? 0 : -ENOMEM; | |
876 | } | |
877 | ||
a1de9666 AB |
878 | static const struct net_device_ops sa1100_irda_netdev_ops = { |
879 | .ndo_open = sa1100_irda_start, | |
880 | .ndo_stop = sa1100_irda_stop, | |
881 | .ndo_start_xmit = sa1100_irda_hard_xmit, | |
882 | .ndo_do_ioctl = sa1100_irda_ioctl, | |
a1de9666 AB |
883 | }; |
884 | ||
3ae5eaec | 885 | static int sa1100_irda_probe(struct platform_device *pdev) |
1da177e4 | 886 | { |
1da177e4 LT |
887 | struct net_device *dev; |
888 | struct sa1100_irda *si; | |
889 | unsigned int baudrate_mask; | |
890 | int err; | |
891 | ||
892 | if (!pdev->dev.platform_data) | |
893 | return -EINVAL; | |
894 | ||
895 | err = request_mem_region(__PREG(Ser2UTCR0), 0x24, "IrDA") ? 0 : -EBUSY; | |
896 | if (err) | |
897 | goto err_mem_1; | |
898 | err = request_mem_region(__PREG(Ser2HSCR0), 0x1c, "IrDA") ? 0 : -EBUSY; | |
899 | if (err) | |
900 | goto err_mem_2; | |
901 | err = request_mem_region(__PREG(Ser2HSCR2), 0x04, "IrDA") ? 0 : -EBUSY; | |
902 | if (err) | |
903 | goto err_mem_3; | |
904 | ||
905 | dev = alloc_irdadev(sizeof(struct sa1100_irda)); | |
906 | if (!dev) | |
907 | goto err_mem_4; | |
908 | ||
4cf1653a | 909 | si = netdev_priv(dev); |
1da177e4 LT |
910 | si->dev = &pdev->dev; |
911 | si->pdata = pdev->dev.platform_data; | |
912 | ||
913 | /* | |
914 | * Initialise the HP-SIR buffers | |
915 | */ | |
916 | err = sa1100_irda_init_iobuf(&si->rx_buff, 14384); | |
917 | if (err) | |
918 | goto err_mem_5; | |
919 | err = sa1100_irda_init_iobuf(&si->tx_buff, 4000); | |
920 | if (err) | |
921 | goto err_mem_5; | |
922 | ||
a1de9666 | 923 | dev->netdev_ops = &sa1100_irda_netdev_ops; |
bf98a826 | 924 | dev->irq = IRQ_Ser2ICP; |
1da177e4 LT |
925 | |
926 | irda_init_max_qos_capabilies(&si->qos); | |
927 | ||
928 | /* | |
929 | * We support original IRDA up to 115k2. (we don't currently | |
930 | * support 4Mbps). Min Turn Time set to 1ms or greater. | |
931 | */ | |
932 | baudrate_mask = IR_9600; | |
933 | ||
934 | switch (max_rate) { | |
935 | case 4000000: baudrate_mask |= IR_4000000 << 8; | |
936 | case 115200: baudrate_mask |= IR_115200; | |
937 | case 57600: baudrate_mask |= IR_57600; | |
938 | case 38400: baudrate_mask |= IR_38400; | |
939 | case 19200: baudrate_mask |= IR_19200; | |
940 | } | |
941 | ||
942 | si->qos.baud_rate.bits &= baudrate_mask; | |
943 | si->qos.min_turn_time.bits = 7; | |
944 | ||
945 | irda_qos_bits_to_value(&si->qos); | |
946 | ||
947 | si->utcr4 = UTCR4_HPSIR; | |
948 | if (tx_lpm) | |
949 | si->utcr4 |= UTCR4_Z1_6us; | |
950 | ||
951 | /* | |
952 | * Initially enable HP-SIR modulation, and ensure that the port | |
953 | * is disabled. | |
954 | */ | |
955 | Ser2UTCR3 = 0; | |
956 | Ser2UTCR4 = si->utcr4; | |
957 | Ser2HSCR0 = HSCR0_UART; | |
958 | ||
959 | err = register_netdev(dev); | |
960 | if (err == 0) | |
3ae5eaec | 961 | platform_set_drvdata(pdev, dev); |
1da177e4 LT |
962 | |
963 | if (err) { | |
964 | err_mem_5: | |
965 | kfree(si->tx_buff.head); | |
966 | kfree(si->rx_buff.head); | |
967 | free_netdev(dev); | |
968 | err_mem_4: | |
969 | release_mem_region(__PREG(Ser2HSCR2), 0x04); | |
970 | err_mem_3: | |
971 | release_mem_region(__PREG(Ser2HSCR0), 0x1c); | |
972 | err_mem_2: | |
973 | release_mem_region(__PREG(Ser2UTCR0), 0x24); | |
974 | } | |
975 | err_mem_1: | |
976 | return err; | |
977 | } | |
978 | ||
3ae5eaec | 979 | static int sa1100_irda_remove(struct platform_device *pdev) |
1da177e4 | 980 | { |
3ae5eaec | 981 | struct net_device *dev = platform_get_drvdata(pdev); |
1da177e4 LT |
982 | |
983 | if (dev) { | |
4cf1653a | 984 | struct sa1100_irda *si = netdev_priv(dev); |
1da177e4 LT |
985 | unregister_netdev(dev); |
986 | kfree(si->tx_buff.head); | |
987 | kfree(si->rx_buff.head); | |
988 | free_netdev(dev); | |
989 | } | |
990 | ||
991 | release_mem_region(__PREG(Ser2HSCR2), 0x04); | |
992 | release_mem_region(__PREG(Ser2HSCR0), 0x1c); | |
993 | release_mem_region(__PREG(Ser2UTCR0), 0x24); | |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
3ae5eaec | 998 | static struct platform_driver sa1100ir_driver = { |
1da177e4 LT |
999 | .probe = sa1100_irda_probe, |
1000 | .remove = sa1100_irda_remove, | |
1001 | .suspend = sa1100_irda_suspend, | |
1002 | .resume = sa1100_irda_resume, | |
3ae5eaec RK |
1003 | .driver = { |
1004 | .name = "sa11x0-ir", | |
72abb461 | 1005 | .owner = THIS_MODULE, |
3ae5eaec | 1006 | }, |
1da177e4 LT |
1007 | }; |
1008 | ||
1009 | static int __init sa1100_irda_init(void) | |
1010 | { | |
1011 | /* | |
1012 | * Limit power level a sensible range. | |
1013 | */ | |
1014 | if (power_level < 1) | |
1015 | power_level = 1; | |
1016 | if (power_level > 3) | |
1017 | power_level = 3; | |
1018 | ||
3ae5eaec | 1019 | return platform_driver_register(&sa1100ir_driver); |
1da177e4 LT |
1020 | } |
1021 | ||
1022 | static void __exit sa1100_irda_exit(void) | |
1023 | { | |
3ae5eaec | 1024 | platform_driver_unregister(&sa1100ir_driver); |
1da177e4 LT |
1025 | } |
1026 | ||
1027 | module_init(sa1100_irda_init); | |
1028 | module_exit(sa1100_irda_exit); | |
1029 | module_param(power_level, int, 0); | |
1030 | module_param(tx_lpm, int, 0); | |
1031 | module_param(max_rate, int, 0); | |
1032 | ||
1033 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); | |
1034 | MODULE_DESCRIPTION("StrongARM SA1100 IrDA driver"); | |
1035 | MODULE_LICENSE("GPL"); | |
1036 | MODULE_PARM_DESC(power_level, "IrDA power level, 1 (low) to 3 (high)"); | |
1037 | MODULE_PARM_DESC(tx_lpm, "Enable transmitter low power (1.6us) mode"); | |
1038 | MODULE_PARM_DESC(max_rate, "Maximum baud rate (4000000, 115200, 57600, 38400, 19200, 9600)"); | |
72abb461 | 1039 | MODULE_ALIAS("platform:sa11x0-ir"); |