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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 */
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>
31#include <linux/platform_device.h>
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>
39#include <mach/dma.h>
40#include <mach/hardware.h>
41#include <asm/mach/irda.h>
42
43static int power_level = 3;
44static int tx_lpm;
45static int max_rate = 4000000;
46
47struct 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
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 */
79static 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 */
107static 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 */
130static 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 */
207static 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
216static inline int
217sa1100_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
228static 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 ret = si->pdata->startup(si->dev);
237 if (ret)
238 return ret;
239 }
240
241 /*
242 * Configure PPC for IRDA - we want to drive TXD2 low.
243 * We also want to drive this pin low during sleep.
244 */
245 PPSR &= ~PPC_TXD2;
246 PSDR &= ~PPC_TXD2;
247 PPDR |= PPC_TXD2;
248
249 /*
250 * Enable HP-SIR modulation, and ensure that the port is disabled.
251 */
252 Ser2UTCR3 = 0;
253 Ser2HSCR0 = HSCR0_UART;
254 Ser2UTCR4 = si->utcr4;
255 Ser2UTCR0 = UTCR0_8BitData;
256 Ser2HSCR2 = HSCR2_TrDataH | HSCR2_RcDataL;
257
258 /*
259 * Clear status register
260 */
261 Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
262
263 ret = sa1100_irda_set_speed(si, si->speed = 9600);
264 if (ret) {
265 Ser2UTCR3 = 0;
266 Ser2HSCR0 = 0;
267
268 if (si->pdata->shutdown)
269 si->pdata->shutdown(si->dev);
270 }
271
272 return ret;
273}
274
275static void sa1100_irda_shutdown(struct sa1100_irda *si)
276{
277 /*
278 * Stop all DMA activity.
279 */
280 sa1100_stop_dma(si->rxdma);
281 sa1100_stop_dma(si->txdma);
282
283 /* Disable the port. */
284 Ser2UTCR3 = 0;
285 Ser2HSCR0 = 0;
286
287 if (si->pdata->shutdown)
288 si->pdata->shutdown(si->dev);
289}
290
291#ifdef CONFIG_PM
292/*
293 * Suspend the IrDA interface.
294 */
295static int sa1100_irda_suspend(struct platform_device *pdev, pm_message_t state)
296{
297 struct net_device *dev = platform_get_drvdata(pdev);
298 struct sa1100_irda *si;
299
300 if (!dev)
301 return 0;
302
303 si = netdev_priv(dev);
304 if (si->open) {
305 /*
306 * Stop the transmit queue
307 */
308 netif_device_detach(dev);
309 disable_irq(dev->irq);
310 sa1100_irda_shutdown(si);
311 __sa1100_irda_set_power(si, 0);
312 }
313
314 return 0;
315}
316
317/*
318 * Resume the IrDA interface.
319 */
320static int sa1100_irda_resume(struct platform_device *pdev)
321{
322 struct net_device *dev = platform_get_drvdata(pdev);
323 struct sa1100_irda *si;
324
325 if (!dev)
326 return 0;
327
328 si = netdev_priv(dev);
329 if (si->open) {
330 /*
331 * If we missed a speed change, initialise at the new speed
332 * directly. It is debatable whether this is actually
333 * required, but in the interests of continuing from where
334 * we left off it is desirable. The converse argument is
335 * that we should re-negotiate at 9600 baud again.
336 */
337 if (si->newspeed) {
338 si->speed = si->newspeed;
339 si->newspeed = 0;
340 }
341
342 sa1100_irda_startup(si);
343 __sa1100_irda_set_power(si, si->power);
344 enable_irq(dev->irq);
345
346 /*
347 * This automatically wakes up the queue
348 */
349 netif_device_attach(dev);
350 }
351
352 return 0;
353}
354#else
355#define sa1100_irda_suspend NULL
356#define sa1100_irda_resume NULL
357#endif
358
359/*
360 * HP-SIR format interrupt service routines.
361 */
362static void sa1100_irda_hpsir_irq(struct net_device *dev)
363{
364 struct sa1100_irda *si = netdev_priv(dev);
365 int status;
366
367 status = Ser2UTSR0;
368
369 /*
370 * Deal with any receive errors first. The bytes in error may be
371 * the only bytes in the receive FIFO, so we do this first.
372 */
373 while (status & UTSR0_EIF) {
374 int stat, data;
375
376 stat = Ser2UTSR1;
377 data = Ser2UTDR;
378
379 if (stat & (UTSR1_FRE | UTSR1_ROR)) {
380 dev->stats.rx_errors++;
381 if (stat & UTSR1_FRE)
382 dev->stats.rx_frame_errors++;
383 if (stat & UTSR1_ROR)
384 dev->stats.rx_fifo_errors++;
385 } else
386 async_unwrap_char(dev, &dev->stats, &si->rx_buff, data);
387
388 status = Ser2UTSR0;
389 }
390
391 /*
392 * We must clear certain bits.
393 */
394 Ser2UTSR0 = status & (UTSR0_RID | UTSR0_RBB | UTSR0_REB);
395
396 if (status & UTSR0_RFS) {
397 /*
398 * There are at least 4 bytes in the FIFO. Read 3 bytes
399 * and leave the rest to the block below.
400 */
401 async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
402 async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
403 async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
404 }
405
406 if (status & (UTSR0_RFS | UTSR0_RID)) {
407 /*
408 * Fifo contains more than 1 character.
409 */
410 do {
411 async_unwrap_char(dev, &dev->stats, &si->rx_buff,
412 Ser2UTDR);
413 } while (Ser2UTSR1 & UTSR1_RNE);
414
415 }
416
417 if (status & UTSR0_TFS && si->tx_buff.len) {
418 /*
419 * Transmitter FIFO is not full
420 */
421 do {
422 Ser2UTDR = *si->tx_buff.data++;
423 si->tx_buff.len -= 1;
424 } while (Ser2UTSR1 & UTSR1_TNF && si->tx_buff.len);
425
426 if (si->tx_buff.len == 0) {
427 dev->stats.tx_packets++;
428 dev->stats.tx_bytes += si->tx_buff.data -
429 si->tx_buff.head;
430
431 /*
432 * We need to ensure that the transmitter has
433 * finished.
434 */
435 do
436 rmb();
437 while (Ser2UTSR1 & UTSR1_TBY);
438
439 /*
440 * Ok, we've finished transmitting. Now enable
441 * the receiver. Sometimes we get a receive IRQ
442 * immediately after a transmit...
443 */
444 Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
445 Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
446
447 if (si->newspeed) {
448 sa1100_irda_set_speed(si, si->newspeed);
449 si->newspeed = 0;
450 }
451
452 /* I'm hungry! */
453 netif_wake_queue(dev);
454 }
455 }
456}
457
458static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev)
459{
460 struct sk_buff *skb = si->rxskb;
461 dma_addr_t dma_addr;
462 unsigned int len, stat, data;
463
464 if (!skb) {
465 printk(KERN_ERR "sa1100_ir: SKB is NULL!\n");
466 return;
467 }
468
469 /*
470 * Get the current data position.
471 */
472 dma_addr = sa1100_get_dma_pos(si->rxdma);
473 len = dma_addr - si->rxbuf_dma;
474 if (len > HPSIR_MAX_RXLEN)
475 len = HPSIR_MAX_RXLEN;
476 dma_unmap_single(si->dev, si->rxbuf_dma, len, DMA_FROM_DEVICE);
477
478 do {
479 /*
480 * Read Status, and then Data.
481 */
482 stat = Ser2HSSR1;
483 rmb();
484 data = Ser2HSDR;
485
486 if (stat & (HSSR1_CRE | HSSR1_ROR)) {
487 dev->stats.rx_errors++;
488 if (stat & HSSR1_CRE)
489 dev->stats.rx_crc_errors++;
490 if (stat & HSSR1_ROR)
491 dev->stats.rx_frame_errors++;
492 } else
493 skb->data[len++] = data;
494
495 /*
496 * If we hit the end of frame, there's
497 * no point in continuing.
498 */
499 if (stat & HSSR1_EOF)
500 break;
501 } while (Ser2HSSR0 & HSSR0_EIF);
502
503 if (stat & HSSR1_EOF) {
504 si->rxskb = NULL;
505
506 skb_put(skb, len);
507 skb->dev = dev;
508 skb_reset_mac_header(skb);
509 skb->protocol = htons(ETH_P_IRDA);
510 dev->stats.rx_packets++;
511 dev->stats.rx_bytes += len;
512
513 /*
514 * Before we pass the buffer up, allocate a new one.
515 */
516 sa1100_irda_rx_alloc(si);
517
518 netif_rx(skb);
519 } else {
520 /*
521 * Remap the buffer.
522 */
523 si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data,
524 HPSIR_MAX_RXLEN,
525 DMA_FROM_DEVICE);
526 }
527}
528
529/*
530 * FIR format interrupt service routine. We only have to
531 * handle RX events; transmit events go via the TX DMA handler.
532 *
533 * No matter what, we disable RX, process, and the restart RX.
534 */
535static void sa1100_irda_fir_irq(struct net_device *dev)
536{
537 struct sa1100_irda *si = netdev_priv(dev);
538
539 /*
540 * Stop RX DMA
541 */
542 sa1100_stop_dma(si->rxdma);
543
544 /*
545 * Framing error - we throw away the packet completely.
546 * Clearing RXE flushes the error conditions and data
547 * from the fifo.
548 */
549 if (Ser2HSSR0 & (HSSR0_FRE | HSSR0_RAB)) {
550 dev->stats.rx_errors++;
551
552 if (Ser2HSSR0 & HSSR0_FRE)
553 dev->stats.rx_frame_errors++;
554
555 /*
556 * Clear out the DMA...
557 */
558 Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
559
560 /*
561 * Clear selected status bits now, so we
562 * don't miss them next time around.
563 */
564 Ser2HSSR0 = HSSR0_FRE | HSSR0_RAB;
565 }
566
567 /*
568 * Deal with any receive errors. The any of the lowest
569 * 8 bytes in the FIFO may contain an error. We must read
570 * them one by one. The "error" could even be the end of
571 * packet!
572 */
573 if (Ser2HSSR0 & HSSR0_EIF)
574 sa1100_irda_fir_error(si, dev);
575
576 /*
577 * No matter what happens, we must restart reception.
578 */
579 sa1100_irda_rx_dma_start(si);
580}
581
582static irqreturn_t sa1100_irda_irq(int irq, void *dev_id)
583{
584 struct net_device *dev = dev_id;
585 if (IS_FIR(((struct sa1100_irda *)netdev_priv(dev))))
586 sa1100_irda_fir_irq(dev);
587 else
588 sa1100_irda_hpsir_irq(dev);
589 return IRQ_HANDLED;
590}
591
592/*
593 * TX DMA completion handler.
594 */
595static void sa1100_irda_txdma_irq(void *id)
596{
597 struct net_device *dev = id;
598 struct sa1100_irda *si = netdev_priv(dev);
599 struct sk_buff *skb = si->txskb;
600
601 si->txskb = NULL;
602
603 /*
604 * Wait for the transmission to complete. Unfortunately,
605 * the hardware doesn't give us an interrupt to indicate
606 * "end of frame".
607 */
608 do
609 rmb();
610 while (!(Ser2HSSR0 & HSSR0_TUR) || Ser2HSSR1 & HSSR1_TBY);
611
612 /*
613 * Clear the transmit underrun bit.
614 */
615 Ser2HSSR0 = HSSR0_TUR;
616
617 /*
618 * Do we need to change speed? Note that we're lazy
619 * here - we don't free the old rxskb. We don't need
620 * to allocate a buffer either.
621 */
622 if (si->newspeed) {
623 sa1100_irda_set_speed(si, si->newspeed);
624 si->newspeed = 0;
625 }
626
627 /*
628 * Start reception. This disables the transmitter for
629 * us. This will be using the existing RX buffer.
630 */
631 sa1100_irda_rx_dma_start(si);
632
633 /*
634 * Account and free the packet.
635 */
636 if (skb) {
637 dma_unmap_single(si->dev, si->txbuf_dma, skb->len, DMA_TO_DEVICE);
638 dev->stats.tx_packets ++;
639 dev->stats.tx_bytes += skb->len;
640 dev_kfree_skb_irq(skb);
641 }
642
643 /*
644 * Make sure that the TX queue is available for sending
645 * (for retries). TX has priority over RX at all times.
646 */
647 netif_wake_queue(dev);
648}
649
650static int sa1100_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
651{
652 struct sa1100_irda *si = netdev_priv(dev);
653 int speed = irda_get_next_speed(skb);
654
655 /*
656 * Does this packet contain a request to change the interface
657 * speed? If so, remember it until we complete the transmission
658 * of this frame.
659 */
660 if (speed != si->speed && speed != -1)
661 si->newspeed = speed;
662
663 /*
664 * If this is an empty frame, we can bypass a lot.
665 */
666 if (skb->len == 0) {
667 if (si->newspeed) {
668 si->newspeed = 0;
669 sa1100_irda_set_speed(si, speed);
670 }
671 dev_kfree_skb(skb);
672 return NETDEV_TX_OK;
673 }
674
675 if (!IS_FIR(si)) {
676 netif_stop_queue(dev);
677
678 si->tx_buff.data = si->tx_buff.head;
679 si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data,
680 si->tx_buff.truesize);
681
682 /*
683 * Set the transmit interrupt enable. This will fire
684 * off an interrupt immediately. Note that we disable
685 * the receiver so we won't get spurious characteres
686 * received.
687 */
688 Ser2UTCR3 = UTCR3_TIE | UTCR3_TXE;
689
690 dev_kfree_skb(skb);
691 } else {
692 int mtt = irda_get_mtt(skb);
693
694 /*
695 * We must not be transmitting...
696 */
697 BUG_ON(si->txskb);
698
699 netif_stop_queue(dev);
700
701 si->txskb = skb;
702 si->txbuf_dma = dma_map_single(si->dev, skb->data,
703 skb->len, DMA_TO_DEVICE);
704
705 sa1100_start_dma(si->txdma, si->txbuf_dma, skb->len);
706
707 /*
708 * If we have a mean turn-around time, impose the specified
709 * specified delay. We could shorten this by timing from
710 * the point we received the packet.
711 */
712 if (mtt)
713 udelay(mtt);
714
715 Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_TXE;
716 }
717
718 return NETDEV_TX_OK;
719}
720
721static int
722sa1100_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
723{
724 struct if_irda_req *rq = (struct if_irda_req *)ifreq;
725 struct sa1100_irda *si = netdev_priv(dev);
726 int ret = -EOPNOTSUPP;
727
728 switch (cmd) {
729 case SIOCSBANDWIDTH:
730 if (capable(CAP_NET_ADMIN)) {
731 /*
732 * We are unable to set the speed if the
733 * device is not running.
734 */
735 if (si->open) {
736 ret = sa1100_irda_set_speed(si,
737 rq->ifr_baudrate);
738 } else {
739 printk("sa1100_irda_ioctl: SIOCSBANDWIDTH: !netif_running\n");
740 ret = 0;
741 }
742 }
743 break;
744
745 case SIOCSMEDIABUSY:
746 ret = -EPERM;
747 if (capable(CAP_NET_ADMIN)) {
748 irda_device_set_media_busy(dev, TRUE);
749 ret = 0;
750 }
751 break;
752
753 case SIOCGRECEIVING:
754 rq->ifr_receiving = IS_FIR(si) ? 0
755 : si->rx_buff.state != OUTSIDE_FRAME;
756 break;
757
758 default:
759 break;
760 }
761
762 return ret;
763}
764
765static int sa1100_irda_start(struct net_device *dev)
766{
767 struct sa1100_irda *si = netdev_priv(dev);
768 int err;
769
770 si->speed = 9600;
771
772 err = request_irq(dev->irq, sa1100_irda_irq, 0, dev->name, dev);
773 if (err)
774 goto err_irq;
775
776 err = sa1100_request_dma(DMA_Ser2HSSPRd, "IrDA receive",
777 NULL, NULL, &si->rxdma);
778 if (err)
779 goto err_rx_dma;
780
781 err = sa1100_request_dma(DMA_Ser2HSSPWr, "IrDA transmit",
782 sa1100_irda_txdma_irq, dev, &si->txdma);
783 if (err)
784 goto err_tx_dma;
785
786 /*
787 * The interrupt must remain disabled for now.
788 */
789 disable_irq(dev->irq);
790
791 /*
792 * Setup the serial port for the specified speed.
793 */
794 err = sa1100_irda_startup(si);
795 if (err)
796 goto err_startup;
797
798 /*
799 * Open a new IrLAP layer instance.
800 */
801 si->irlap = irlap_open(dev, &si->qos, "sa1100");
802 err = -ENOMEM;
803 if (!si->irlap)
804 goto err_irlap;
805
806 /*
807 * Now enable the interrupt and start the queue
808 */
809 si->open = 1;
810 sa1100_set_power(si, power_level); /* low power mode */
811 enable_irq(dev->irq);
812 netif_start_queue(dev);
813 return 0;
814
815err_irlap:
816 si->open = 0;
817 sa1100_irda_shutdown(si);
818err_startup:
819 sa1100_free_dma(si->txdma);
820err_tx_dma:
821 sa1100_free_dma(si->rxdma);
822err_rx_dma:
823 free_irq(dev->irq, dev);
824err_irq:
825 return err;
826}
827
828static int sa1100_irda_stop(struct net_device *dev)
829{
830 struct sa1100_irda *si = netdev_priv(dev);
831
832 disable_irq(dev->irq);
833 sa1100_irda_shutdown(si);
834
835 /*
836 * If we have been doing DMA receive, make sure we
837 * tidy that up cleanly.
838 */
839 if (si->rxskb) {
840 dma_unmap_single(si->dev, si->rxbuf_dma, HPSIR_MAX_RXLEN,
841 DMA_FROM_DEVICE);
842 dev_kfree_skb(si->rxskb);
843 si->rxskb = NULL;
844 }
845
846 /* Stop IrLAP */
847 if (si->irlap) {
848 irlap_close(si->irlap);
849 si->irlap = NULL;
850 }
851
852 netif_stop_queue(dev);
853 si->open = 0;
854
855 /*
856 * Free resources
857 */
858 sa1100_free_dma(si->txdma);
859 sa1100_free_dma(si->rxdma);
860 free_irq(dev->irq, dev);
861
862 sa1100_set_power(si, 0);
863
864 return 0;
865}
866
867static int sa1100_irda_init_iobuf(iobuff_t *io, int size)
868{
869 io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
870 if (io->head != NULL) {
871 io->truesize = size;
872 io->in_frame = FALSE;
873 io->state = OUTSIDE_FRAME;
874 io->data = io->head;
875 }
876 return io->head ? 0 : -ENOMEM;
877}
878
879static const struct net_device_ops sa1100_irda_netdev_ops = {
880 .ndo_open = sa1100_irda_start,
881 .ndo_stop = sa1100_irda_stop,
882 .ndo_start_xmit = sa1100_irda_hard_xmit,
883 .ndo_do_ioctl = sa1100_irda_ioctl,
884};
885
886static int sa1100_irda_probe(struct platform_device *pdev)
887{
888 struct net_device *dev;
889 struct sa1100_irda *si;
890 unsigned int baudrate_mask;
891 int err;
892
893 if (!pdev->dev.platform_data)
894 return -EINVAL;
895
896 err = request_mem_region(__PREG(Ser2UTCR0), 0x24, "IrDA") ? 0 : -EBUSY;
897 if (err)
898 goto err_mem_1;
899 err = request_mem_region(__PREG(Ser2HSCR0), 0x1c, "IrDA") ? 0 : -EBUSY;
900 if (err)
901 goto err_mem_2;
902 err = request_mem_region(__PREG(Ser2HSCR2), 0x04, "IrDA") ? 0 : -EBUSY;
903 if (err)
904 goto err_mem_3;
905
906 dev = alloc_irdadev(sizeof(struct sa1100_irda));
907 if (!dev)
908 goto err_mem_4;
909
910 si = netdev_priv(dev);
911 si->dev = &pdev->dev;
912 si->pdata = pdev->dev.platform_data;
913
914 /*
915 * Initialise the HP-SIR buffers
916 */
917 err = sa1100_irda_init_iobuf(&si->rx_buff, 14384);
918 if (err)
919 goto err_mem_5;
920 err = sa1100_irda_init_iobuf(&si->tx_buff, 4000);
921 if (err)
922 goto err_mem_5;
923
924 dev->netdev_ops = &sa1100_irda_netdev_ops;
925 dev->irq = IRQ_Ser2ICP;
926
927 irda_init_max_qos_capabilies(&si->qos);
928
929 /*
930 * We support original IRDA up to 115k2. (we don't currently
931 * support 4Mbps). Min Turn Time set to 1ms or greater.
932 */
933 baudrate_mask = IR_9600;
934
935 switch (max_rate) {
936 case 4000000: baudrate_mask |= IR_4000000 << 8;
937 case 115200: baudrate_mask |= IR_115200;
938 case 57600: baudrate_mask |= IR_57600;
939 case 38400: baudrate_mask |= IR_38400;
940 case 19200: baudrate_mask |= IR_19200;
941 }
942
943 si->qos.baud_rate.bits &= baudrate_mask;
944 si->qos.min_turn_time.bits = 7;
945
946 irda_qos_bits_to_value(&si->qos);
947
948 si->utcr4 = UTCR4_HPSIR;
949 if (tx_lpm)
950 si->utcr4 |= UTCR4_Z1_6us;
951
952 /*
953 * Initially enable HP-SIR modulation, and ensure that the port
954 * is disabled.
955 */
956 Ser2UTCR3 = 0;
957 Ser2UTCR4 = si->utcr4;
958 Ser2HSCR0 = HSCR0_UART;
959
960 err = register_netdev(dev);
961 if (err == 0)
962 platform_set_drvdata(pdev, dev);
963
964 if (err) {
965 err_mem_5:
966 kfree(si->tx_buff.head);
967 kfree(si->rx_buff.head);
968 free_netdev(dev);
969 err_mem_4:
970 release_mem_region(__PREG(Ser2HSCR2), 0x04);
971 err_mem_3:
972 release_mem_region(__PREG(Ser2HSCR0), 0x1c);
973 err_mem_2:
974 release_mem_region(__PREG(Ser2UTCR0), 0x24);
975 }
976 err_mem_1:
977 return err;
978}
979
980static int sa1100_irda_remove(struct platform_device *pdev)
981{
982 struct net_device *dev = platform_get_drvdata(pdev);
983
984 if (dev) {
985 struct sa1100_irda *si = netdev_priv(dev);
986 unregister_netdev(dev);
987 kfree(si->tx_buff.head);
988 kfree(si->rx_buff.head);
989 free_netdev(dev);
990 }
991
992 release_mem_region(__PREG(Ser2HSCR2), 0x04);
993 release_mem_region(__PREG(Ser2HSCR0), 0x1c);
994 release_mem_region(__PREG(Ser2UTCR0), 0x24);
995
996 return 0;
997}
998
999static struct platform_driver sa1100ir_driver = {
1000 .probe = sa1100_irda_probe,
1001 .remove = sa1100_irda_remove,
1002 .suspend = sa1100_irda_suspend,
1003 .resume = sa1100_irda_resume,
1004 .driver = {
1005 .name = "sa11x0-ir",
1006 .owner = THIS_MODULE,
1007 },
1008};
1009
1010static int __init sa1100_irda_init(void)
1011{
1012 /*
1013 * Limit power level a sensible range.
1014 */
1015 if (power_level < 1)
1016 power_level = 1;
1017 if (power_level > 3)
1018 power_level = 3;
1019
1020 return platform_driver_register(&sa1100ir_driver);
1021}
1022
1023static void __exit sa1100_irda_exit(void)
1024{
1025 platform_driver_unregister(&sa1100ir_driver);
1026}
1027
1028module_init(sa1100_irda_init);
1029module_exit(sa1100_irda_exit);
1030module_param(power_level, int, 0);
1031module_param(tx_lpm, int, 0);
1032module_param(max_rate, int, 0);
1033
1034MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
1035MODULE_DESCRIPTION("StrongARM SA1100 IrDA driver");
1036MODULE_LICENSE("GPL");
1037MODULE_PARM_DESC(power_level, "IrDA power level, 1 (low) to 3 (high)");
1038MODULE_PARM_DESC(tx_lpm, "Enable transmitter low power (1.6us) mode");
1039MODULE_PARM_DESC(max_rate, "Maximum baud rate (4000000, 115200, 57600, 38400, 19200, 9600)");
1040MODULE_ALIAS("platform:sa11x0-ir");