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Merge commit 'kumar/kumar-next' into next
[deliverable/linux.git] / drivers / net / irda / pxaficp_ir.c
1 /*
2 * linux/drivers/net/irda/pxaficp_ir.c
3 *
4 * Based on sa1100_ir.c by Russell King
5 *
6 * Changes copyright (C) 2003-2005 MontaVista Software, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * Infra-red driver (SIR/FIR) for the PXA2xx embedded microprocessor
13 *
14 */
15 #include <linux/module.h>
16 #include <linux/netdevice.h>
17 #include <linux/platform_device.h>
18 #include <linux/clk.h>
19
20 #include <net/irda/irda.h>
21 #include <net/irda/irmod.h>
22 #include <net/irda/wrapper.h>
23 #include <net/irda/irda_device.h>
24
25 #include <mach/dma.h>
26 #include <mach/irda.h>
27 #include <mach/hardware.h>
28 #include <mach/pxa-regs.h>
29 #include <mach/regs-uart.h>
30
31 #define FICP __REG(0x40800000) /* Start of FICP area */
32 #define ICCR0 __REG(0x40800000) /* ICP Control Register 0 */
33 #define ICCR1 __REG(0x40800004) /* ICP Control Register 1 */
34 #define ICCR2 __REG(0x40800008) /* ICP Control Register 2 */
35 #define ICDR __REG(0x4080000c) /* ICP Data Register */
36 #define ICSR0 __REG(0x40800014) /* ICP Status Register 0 */
37 #define ICSR1 __REG(0x40800018) /* ICP Status Register 1 */
38
39 #define ICCR0_AME (1 << 7) /* Address match enable */
40 #define ICCR0_TIE (1 << 6) /* Transmit FIFO interrupt enable */
41 #define ICCR0_RIE (1 << 5) /* Recieve FIFO interrupt enable */
42 #define ICCR0_RXE (1 << 4) /* Receive enable */
43 #define ICCR0_TXE (1 << 3) /* Transmit enable */
44 #define ICCR0_TUS (1 << 2) /* Transmit FIFO underrun select */
45 #define ICCR0_LBM (1 << 1) /* Loopback mode */
46 #define ICCR0_ITR (1 << 0) /* IrDA transmission */
47
48 #define ICCR2_RXP (1 << 3) /* Receive Pin Polarity select */
49 #define ICCR2_TXP (1 << 2) /* Transmit Pin Polarity select */
50 #define ICCR2_TRIG (3 << 0) /* Receive FIFO Trigger threshold */
51 #define ICCR2_TRIG_8 (0 << 0) /* >= 8 bytes */
52 #define ICCR2_TRIG_16 (1 << 0) /* >= 16 bytes */
53 #define ICCR2_TRIG_32 (2 << 0) /* >= 32 bytes */
54
55 #ifdef CONFIG_PXA27x
56 #define ICSR0_EOC (1 << 6) /* DMA End of Descriptor Chain */
57 #endif
58 #define ICSR0_FRE (1 << 5) /* Framing error */
59 #define ICSR0_RFS (1 << 4) /* Receive FIFO service request */
60 #define ICSR0_TFS (1 << 3) /* Transnit FIFO service request */
61 #define ICSR0_RAB (1 << 2) /* Receiver abort */
62 #define ICSR0_TUR (1 << 1) /* Trunsmit FIFO underun */
63 #define ICSR0_EIF (1 << 0) /* End/Error in FIFO */
64
65 #define ICSR1_ROR (1 << 6) /* Receiver FIFO underrun */
66 #define ICSR1_CRE (1 << 5) /* CRC error */
67 #define ICSR1_EOF (1 << 4) /* End of frame */
68 #define ICSR1_TNF (1 << 3) /* Transmit FIFO not full */
69 #define ICSR1_RNE (1 << 2) /* Receive FIFO not empty */
70 #define ICSR1_TBY (1 << 1) /* Tramsmiter busy flag */
71 #define ICSR1_RSY (1 << 0) /* Recevier synchronized flag */
72
73 #define IrSR_RXPL_NEG_IS_ZERO (1<<4)
74 #define IrSR_RXPL_POS_IS_ZERO 0x0
75 #define IrSR_TXPL_NEG_IS_ZERO (1<<3)
76 #define IrSR_TXPL_POS_IS_ZERO 0x0
77 #define IrSR_XMODE_PULSE_1_6 (1<<2)
78 #define IrSR_XMODE_PULSE_3_16 0x0
79 #define IrSR_RCVEIR_IR_MODE (1<<1)
80 #define IrSR_RCVEIR_UART_MODE 0x0
81 #define IrSR_XMITIR_IR_MODE (1<<0)
82 #define IrSR_XMITIR_UART_MODE 0x0
83
84 #define IrSR_IR_RECEIVE_ON (\
85 IrSR_RXPL_NEG_IS_ZERO | \
86 IrSR_TXPL_POS_IS_ZERO | \
87 IrSR_XMODE_PULSE_3_16 | \
88 IrSR_RCVEIR_IR_MODE | \
89 IrSR_XMITIR_UART_MODE)
90
91 #define IrSR_IR_TRANSMIT_ON (\
92 IrSR_RXPL_NEG_IS_ZERO | \
93 IrSR_TXPL_POS_IS_ZERO | \
94 IrSR_XMODE_PULSE_3_16 | \
95 IrSR_RCVEIR_UART_MODE | \
96 IrSR_XMITIR_IR_MODE)
97
98 struct pxa_irda {
99 int speed;
100 int newspeed;
101 unsigned long last_oscr;
102
103 unsigned char *dma_rx_buff;
104 unsigned char *dma_tx_buff;
105 dma_addr_t dma_rx_buff_phy;
106 dma_addr_t dma_tx_buff_phy;
107 unsigned int dma_tx_buff_len;
108 int txdma;
109 int rxdma;
110
111 struct net_device_stats stats;
112 struct irlap_cb *irlap;
113 struct qos_info qos;
114
115 iobuff_t tx_buff;
116 iobuff_t rx_buff;
117
118 struct device *dev;
119 struct pxaficp_platform_data *pdata;
120 struct clk *fir_clk;
121 struct clk *sir_clk;
122 struct clk *cur_clk;
123 };
124
125 static inline void pxa_irda_disable_clk(struct pxa_irda *si)
126 {
127 if (si->cur_clk)
128 clk_disable(si->cur_clk);
129 si->cur_clk = NULL;
130 }
131
132 static inline void pxa_irda_enable_firclk(struct pxa_irda *si)
133 {
134 si->cur_clk = si->fir_clk;
135 clk_enable(si->fir_clk);
136 }
137
138 static inline void pxa_irda_enable_sirclk(struct pxa_irda *si)
139 {
140 si->cur_clk = si->sir_clk;
141 clk_enable(si->sir_clk);
142 }
143
144
145 #define IS_FIR(si) ((si)->speed >= 4000000)
146 #define IRDA_FRAME_SIZE_LIMIT 2047
147
148 inline static void pxa_irda_fir_dma_rx_start(struct pxa_irda *si)
149 {
150 DCSR(si->rxdma) = DCSR_NODESC;
151 DSADR(si->rxdma) = __PREG(ICDR);
152 DTADR(si->rxdma) = si->dma_rx_buff_phy;
153 DCMD(si->rxdma) = DCMD_INCTRGADDR | DCMD_FLOWSRC | DCMD_WIDTH1 | DCMD_BURST32 | IRDA_FRAME_SIZE_LIMIT;
154 DCSR(si->rxdma) |= DCSR_RUN;
155 }
156
157 inline static void pxa_irda_fir_dma_tx_start(struct pxa_irda *si)
158 {
159 DCSR(si->txdma) = DCSR_NODESC;
160 DSADR(si->txdma) = si->dma_tx_buff_phy;
161 DTADR(si->txdma) = __PREG(ICDR);
162 DCMD(si->txdma) = DCMD_INCSRCADDR | DCMD_FLOWTRG | DCMD_ENDIRQEN | DCMD_WIDTH1 | DCMD_BURST32 | si->dma_tx_buff_len;
163 DCSR(si->txdma) |= DCSR_RUN;
164 }
165
166 /*
167 * Set the IrDA communications speed.
168 */
169 static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
170 {
171 unsigned long flags;
172 unsigned int divisor;
173
174 switch (speed) {
175 case 9600: case 19200: case 38400:
176 case 57600: case 115200:
177
178 /* refer to PXA250/210 Developer's Manual 10-7 */
179 /* BaudRate = 14.7456 MHz / (16*Divisor) */
180 divisor = 14745600 / (16 * speed);
181
182 local_irq_save(flags);
183
184 if (IS_FIR(si)) {
185 /* stop RX DMA */
186 DCSR(si->rxdma) &= ~DCSR_RUN;
187 /* disable FICP */
188 ICCR0 = 0;
189 pxa_irda_disable_clk(si);
190
191 /* set board transceiver to SIR mode */
192 si->pdata->transceiver_mode(si->dev, IR_SIRMODE);
193
194 /* enable the STUART clock */
195 pxa_irda_enable_sirclk(si);
196 }
197
198 /* disable STUART first */
199 STIER = 0;
200
201 /* access DLL & DLH */
202 STLCR |= LCR_DLAB;
203 STDLL = divisor & 0xff;
204 STDLH = divisor >> 8;
205 STLCR &= ~LCR_DLAB;
206
207 si->speed = speed;
208 STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
209 STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
210
211 local_irq_restore(flags);
212 break;
213
214 case 4000000:
215 local_irq_save(flags);
216
217 /* disable STUART */
218 STIER = 0;
219 STISR = 0;
220 pxa_irda_disable_clk(si);
221
222 /* disable FICP first */
223 ICCR0 = 0;
224
225 /* set board transceiver to FIR mode */
226 si->pdata->transceiver_mode(si->dev, IR_FIRMODE);
227
228 /* enable the FICP clock */
229 pxa_irda_enable_firclk(si);
230
231 si->speed = speed;
232 pxa_irda_fir_dma_rx_start(si);
233 ICCR0 = ICCR0_ITR | ICCR0_RXE;
234
235 local_irq_restore(flags);
236 break;
237
238 default:
239 return -EINVAL;
240 }
241
242 return 0;
243 }
244
245 /* SIR interrupt service routine. */
246 static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
247 {
248 struct net_device *dev = dev_id;
249 struct pxa_irda *si = netdev_priv(dev);
250 int iir, lsr, data;
251
252 iir = STIIR;
253
254 switch (iir & 0x0F) {
255 case 0x06: /* Receiver Line Status */
256 lsr = STLSR;
257 while (lsr & LSR_FIFOE) {
258 data = STRBR;
259 if (lsr & (LSR_OE | LSR_PE | LSR_FE | LSR_BI)) {
260 printk(KERN_DEBUG "pxa_ir: sir receiving error\n");
261 si->stats.rx_errors++;
262 if (lsr & LSR_FE)
263 si->stats.rx_frame_errors++;
264 if (lsr & LSR_OE)
265 si->stats.rx_fifo_errors++;
266 } else {
267 si->stats.rx_bytes++;
268 async_unwrap_char(dev, &si->stats, &si->rx_buff, data);
269 }
270 lsr = STLSR;
271 }
272 si->last_oscr = OSCR;
273 break;
274
275 case 0x04: /* Received Data Available */
276 /* forth through */
277
278 case 0x0C: /* Character Timeout Indication */
279 do {
280 si->stats.rx_bytes++;
281 async_unwrap_char(dev, &si->stats, &si->rx_buff, STRBR);
282 } while (STLSR & LSR_DR);
283 si->last_oscr = OSCR;
284 break;
285
286 case 0x02: /* Transmit FIFO Data Request */
287 while ((si->tx_buff.len) && (STLSR & LSR_TDRQ)) {
288 STTHR = *si->tx_buff.data++;
289 si->tx_buff.len -= 1;
290 }
291
292 if (si->tx_buff.len == 0) {
293 si->stats.tx_packets++;
294 si->stats.tx_bytes += si->tx_buff.data -
295 si->tx_buff.head;
296
297 /* We need to ensure that the transmitter has finished. */
298 while ((STLSR & LSR_TEMT) == 0)
299 cpu_relax();
300 si->last_oscr = OSCR;
301
302 /*
303 * Ok, we've finished transmitting. Now enable
304 * the receiver. Sometimes we get a receive IRQ
305 * immediately after a transmit...
306 */
307 if (si->newspeed) {
308 pxa_irda_set_speed(si, si->newspeed);
309 si->newspeed = 0;
310 } else {
311 /* enable IR Receiver, disable IR Transmitter */
312 STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
313 /* enable STUART and receive interrupts */
314 STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
315 }
316 /* I'm hungry! */
317 netif_wake_queue(dev);
318 }
319 break;
320 }
321
322 return IRQ_HANDLED;
323 }
324
325 /* FIR Receive DMA interrupt handler */
326 static void pxa_irda_fir_dma_rx_irq(int channel, void *data)
327 {
328 int dcsr = DCSR(channel);
329
330 DCSR(channel) = dcsr & ~DCSR_RUN;
331
332 printk(KERN_DEBUG "pxa_ir: fir rx dma bus error %#x\n", dcsr);
333 }
334
335 /* FIR Transmit DMA interrupt handler */
336 static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
337 {
338 struct net_device *dev = data;
339 struct pxa_irda *si = netdev_priv(dev);
340 int dcsr;
341
342 dcsr = DCSR(channel);
343 DCSR(channel) = dcsr & ~DCSR_RUN;
344
345 if (dcsr & DCSR_ENDINTR) {
346 si->stats.tx_packets++;
347 si->stats.tx_bytes += si->dma_tx_buff_len;
348 } else {
349 si->stats.tx_errors++;
350 }
351
352 while (ICSR1 & ICSR1_TBY)
353 cpu_relax();
354 si->last_oscr = OSCR;
355
356 /*
357 * HACK: It looks like the TBY bit is dropped too soon.
358 * Without this delay things break.
359 */
360 udelay(120);
361
362 if (si->newspeed) {
363 pxa_irda_set_speed(si, si->newspeed);
364 si->newspeed = 0;
365 } else {
366 int i = 64;
367
368 ICCR0 = 0;
369 pxa_irda_fir_dma_rx_start(si);
370 while ((ICSR1 & ICSR1_RNE) && i--)
371 (void)ICDR;
372 ICCR0 = ICCR0_ITR | ICCR0_RXE;
373
374 if (i < 0)
375 printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
376 }
377 netif_wake_queue(dev);
378 }
379
380 /* EIF(Error in FIFO/End in Frame) handler for FIR */
381 static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev, int icsr0)
382 {
383 unsigned int len, stat, data;
384
385 /* Get the current data position. */
386 len = DTADR(si->rxdma) - si->dma_rx_buff_phy;
387
388 do {
389 /* Read Status, and then Data. */
390 stat = ICSR1;
391 rmb();
392 data = ICDR;
393
394 if (stat & (ICSR1_CRE | ICSR1_ROR)) {
395 si->stats.rx_errors++;
396 if (stat & ICSR1_CRE) {
397 printk(KERN_DEBUG "pxa_ir: fir receive CRC error\n");
398 si->stats.rx_crc_errors++;
399 }
400 if (stat & ICSR1_ROR) {
401 printk(KERN_DEBUG "pxa_ir: fir receive overrun\n");
402 si->stats.rx_over_errors++;
403 }
404 } else {
405 si->dma_rx_buff[len++] = data;
406 }
407 /* If we hit the end of frame, there's no point in continuing. */
408 if (stat & ICSR1_EOF)
409 break;
410 } while (ICSR0 & ICSR0_EIF);
411
412 if (stat & ICSR1_EOF) {
413 /* end of frame. */
414 struct sk_buff *skb;
415
416 if (icsr0 & ICSR0_FRE) {
417 printk(KERN_ERR "pxa_ir: dropping erroneous frame\n");
418 si->stats.rx_dropped++;
419 return;
420 }
421
422 skb = alloc_skb(len+1,GFP_ATOMIC);
423 if (!skb) {
424 printk(KERN_ERR "pxa_ir: fir out of memory for receive skb\n");
425 si->stats.rx_dropped++;
426 return;
427 }
428
429 /* Align IP header to 20 bytes */
430 skb_reserve(skb, 1);
431 skb_copy_to_linear_data(skb, si->dma_rx_buff, len);
432 skb_put(skb, len);
433
434 /* Feed it to IrLAP */
435 skb->dev = dev;
436 skb_reset_mac_header(skb);
437 skb->protocol = htons(ETH_P_IRDA);
438 netif_rx(skb);
439
440 si->stats.rx_packets++;
441 si->stats.rx_bytes += len;
442 }
443 }
444
445 /* FIR interrupt handler */
446 static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
447 {
448 struct net_device *dev = dev_id;
449 struct pxa_irda *si = netdev_priv(dev);
450 int icsr0, i = 64;
451
452 /* stop RX DMA */
453 DCSR(si->rxdma) &= ~DCSR_RUN;
454 si->last_oscr = OSCR;
455 icsr0 = ICSR0;
456
457 if (icsr0 & (ICSR0_FRE | ICSR0_RAB)) {
458 if (icsr0 & ICSR0_FRE) {
459 printk(KERN_DEBUG "pxa_ir: fir receive frame error\n");
460 si->stats.rx_frame_errors++;
461 } else {
462 printk(KERN_DEBUG "pxa_ir: fir receive abort\n");
463 si->stats.rx_errors++;
464 }
465 ICSR0 = icsr0 & (ICSR0_FRE | ICSR0_RAB);
466 }
467
468 if (icsr0 & ICSR0_EIF) {
469 /* An error in FIFO occured, or there is a end of frame */
470 pxa_irda_fir_irq_eif(si, dev, icsr0);
471 }
472
473 ICCR0 = 0;
474 pxa_irda_fir_dma_rx_start(si);
475 while ((ICSR1 & ICSR1_RNE) && i--)
476 (void)ICDR;
477 ICCR0 = ICCR0_ITR | ICCR0_RXE;
478
479 if (i < 0)
480 printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
481
482 return IRQ_HANDLED;
483 }
484
485 /* hard_xmit interface of irda device */
486 static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
487 {
488 struct pxa_irda *si = netdev_priv(dev);
489 int speed = irda_get_next_speed(skb);
490
491 /*
492 * Does this packet contain a request to change the interface
493 * speed? If so, remember it until we complete the transmission
494 * of this frame.
495 */
496 if (speed != si->speed && speed != -1)
497 si->newspeed = speed;
498
499 /*
500 * If this is an empty frame, we can bypass a lot.
501 */
502 if (skb->len == 0) {
503 if (si->newspeed) {
504 si->newspeed = 0;
505 pxa_irda_set_speed(si, speed);
506 }
507 dev_kfree_skb(skb);
508 return 0;
509 }
510
511 netif_stop_queue(dev);
512
513 if (!IS_FIR(si)) {
514 si->tx_buff.data = si->tx_buff.head;
515 si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data, si->tx_buff.truesize);
516
517 /* Disable STUART interrupts and switch to transmit mode. */
518 STIER = 0;
519 STISR = IrSR_IR_TRANSMIT_ON | IrSR_XMODE_PULSE_1_6;
520
521 /* enable STUART and transmit interrupts */
522 STIER = IER_UUE | IER_TIE;
523 } else {
524 unsigned long mtt = irda_get_mtt(skb);
525
526 si->dma_tx_buff_len = skb->len;
527 skb_copy_from_linear_data(skb, si->dma_tx_buff, skb->len);
528
529 if (mtt)
530 while ((unsigned)(OSCR - si->last_oscr)/4 < mtt)
531 cpu_relax();
532
533 /* stop RX DMA, disable FICP */
534 DCSR(si->rxdma) &= ~DCSR_RUN;
535 ICCR0 = 0;
536
537 pxa_irda_fir_dma_tx_start(si);
538 ICCR0 = ICCR0_ITR | ICCR0_TXE;
539 }
540
541 dev_kfree_skb(skb);
542 dev->trans_start = jiffies;
543 return 0;
544 }
545
546 static int pxa_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
547 {
548 struct if_irda_req *rq = (struct if_irda_req *)ifreq;
549 struct pxa_irda *si = netdev_priv(dev);
550 int ret;
551
552 switch (cmd) {
553 case SIOCSBANDWIDTH:
554 ret = -EPERM;
555 if (capable(CAP_NET_ADMIN)) {
556 /*
557 * We are unable to set the speed if the
558 * device is not running.
559 */
560 if (netif_running(dev)) {
561 ret = pxa_irda_set_speed(si,
562 rq->ifr_baudrate);
563 } else {
564 printk(KERN_INFO "pxa_ir: SIOCSBANDWIDTH: !netif_running\n");
565 ret = 0;
566 }
567 }
568 break;
569
570 case SIOCSMEDIABUSY:
571 ret = -EPERM;
572 if (capable(CAP_NET_ADMIN)) {
573 irda_device_set_media_busy(dev, TRUE);
574 ret = 0;
575 }
576 break;
577
578 case SIOCGRECEIVING:
579 ret = 0;
580 rq->ifr_receiving = IS_FIR(si) ? 0
581 : si->rx_buff.state != OUTSIDE_FRAME;
582 break;
583
584 default:
585 ret = -EOPNOTSUPP;
586 break;
587 }
588
589 return ret;
590 }
591
592 static struct net_device_stats *pxa_irda_stats(struct net_device *dev)
593 {
594 struct pxa_irda *si = netdev_priv(dev);
595 return &si->stats;
596 }
597
598 static void pxa_irda_startup(struct pxa_irda *si)
599 {
600 /* Disable STUART interrupts */
601 STIER = 0;
602 /* enable STUART interrupt to the processor */
603 STMCR = MCR_OUT2;
604 /* configure SIR frame format: StartBit - Data 7 ... Data 0 - Stop Bit */
605 STLCR = LCR_WLS0 | LCR_WLS1;
606 /* enable FIFO, we use FIFO to improve performance */
607 STFCR = FCR_TRFIFOE | FCR_ITL_32;
608
609 /* disable FICP */
610 ICCR0 = 0;
611 /* configure FICP ICCR2 */
612 ICCR2 = ICCR2_TXP | ICCR2_TRIG_32;
613
614 /* configure DMAC */
615 DRCMR(17) = si->rxdma | DRCMR_MAPVLD;
616 DRCMR(18) = si->txdma | DRCMR_MAPVLD;
617
618 /* force SIR reinitialization */
619 si->speed = 4000000;
620 pxa_irda_set_speed(si, 9600);
621
622 printk(KERN_DEBUG "pxa_ir: irda startup\n");
623 }
624
625 static void pxa_irda_shutdown(struct pxa_irda *si)
626 {
627 unsigned long flags;
628
629 local_irq_save(flags);
630
631 /* disable STUART and interrupt */
632 STIER = 0;
633 /* disable STUART SIR mode */
634 STISR = 0;
635
636 /* disable DMA */
637 DCSR(si->txdma) &= ~DCSR_RUN;
638 DCSR(si->rxdma) &= ~DCSR_RUN;
639 /* disable FICP */
640 ICCR0 = 0;
641
642 /* disable the STUART or FICP clocks */
643 pxa_irda_disable_clk(si);
644
645 DRCMR(17) = 0;
646 DRCMR(18) = 0;
647
648 local_irq_restore(flags);
649
650 /* power off board transceiver */
651 si->pdata->transceiver_mode(si->dev, IR_OFF);
652
653 printk(KERN_DEBUG "pxa_ir: irda shutdown\n");
654 }
655
656 static int pxa_irda_start(struct net_device *dev)
657 {
658 struct pxa_irda *si = netdev_priv(dev);
659 int err;
660
661 si->speed = 9600;
662
663 err = request_irq(IRQ_STUART, pxa_irda_sir_irq, 0, dev->name, dev);
664 if (err)
665 goto err_irq1;
666
667 err = request_irq(IRQ_ICP, pxa_irda_fir_irq, 0, dev->name, dev);
668 if (err)
669 goto err_irq2;
670
671 /*
672 * The interrupt must remain disabled for now.
673 */
674 disable_irq(IRQ_STUART);
675 disable_irq(IRQ_ICP);
676
677 err = -EBUSY;
678 si->rxdma = pxa_request_dma("FICP_RX",DMA_PRIO_LOW, pxa_irda_fir_dma_rx_irq, dev);
679 if (si->rxdma < 0)
680 goto err_rx_dma;
681
682 si->txdma = pxa_request_dma("FICP_TX",DMA_PRIO_LOW, pxa_irda_fir_dma_tx_irq, dev);
683 if (si->txdma < 0)
684 goto err_tx_dma;
685
686 err = -ENOMEM;
687 si->dma_rx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
688 &si->dma_rx_buff_phy, GFP_KERNEL );
689 if (!si->dma_rx_buff)
690 goto err_dma_rx_buff;
691
692 si->dma_tx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
693 &si->dma_tx_buff_phy, GFP_KERNEL );
694 if (!si->dma_tx_buff)
695 goto err_dma_tx_buff;
696
697 /* Setup the serial port for the initial speed. */
698 pxa_irda_startup(si);
699
700 /*
701 * Open a new IrLAP layer instance.
702 */
703 si->irlap = irlap_open(dev, &si->qos, "pxa");
704 err = -ENOMEM;
705 if (!si->irlap)
706 goto err_irlap;
707
708 /*
709 * Now enable the interrupt and start the queue
710 */
711 enable_irq(IRQ_STUART);
712 enable_irq(IRQ_ICP);
713 netif_start_queue(dev);
714
715 printk(KERN_DEBUG "pxa_ir: irda driver opened\n");
716
717 return 0;
718
719 err_irlap:
720 pxa_irda_shutdown(si);
721 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
722 err_dma_tx_buff:
723 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
724 err_dma_rx_buff:
725 pxa_free_dma(si->txdma);
726 err_tx_dma:
727 pxa_free_dma(si->rxdma);
728 err_rx_dma:
729 free_irq(IRQ_ICP, dev);
730 err_irq2:
731 free_irq(IRQ_STUART, dev);
732 err_irq1:
733
734 return err;
735 }
736
737 static int pxa_irda_stop(struct net_device *dev)
738 {
739 struct pxa_irda *si = netdev_priv(dev);
740
741 netif_stop_queue(dev);
742
743 pxa_irda_shutdown(si);
744
745 /* Stop IrLAP */
746 if (si->irlap) {
747 irlap_close(si->irlap);
748 si->irlap = NULL;
749 }
750
751 free_irq(IRQ_STUART, dev);
752 free_irq(IRQ_ICP, dev);
753
754 pxa_free_dma(si->rxdma);
755 pxa_free_dma(si->txdma);
756
757 if (si->dma_rx_buff)
758 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
759 if (si->dma_tx_buff)
760 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
761
762 printk(KERN_DEBUG "pxa_ir: irda driver closed\n");
763 return 0;
764 }
765
766 static int pxa_irda_suspend(struct platform_device *_dev, pm_message_t state)
767 {
768 struct net_device *dev = platform_get_drvdata(_dev);
769 struct pxa_irda *si;
770
771 if (dev && netif_running(dev)) {
772 si = netdev_priv(dev);
773 netif_device_detach(dev);
774 pxa_irda_shutdown(si);
775 }
776
777 return 0;
778 }
779
780 static int pxa_irda_resume(struct platform_device *_dev)
781 {
782 struct net_device *dev = platform_get_drvdata(_dev);
783 struct pxa_irda *si;
784
785 if (dev && netif_running(dev)) {
786 si = netdev_priv(dev);
787 pxa_irda_startup(si);
788 netif_device_attach(dev);
789 netif_wake_queue(dev);
790 }
791
792 return 0;
793 }
794
795
796 static int pxa_irda_init_iobuf(iobuff_t *io, int size)
797 {
798 io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
799 if (io->head != NULL) {
800 io->truesize = size;
801 io->in_frame = FALSE;
802 io->state = OUTSIDE_FRAME;
803 io->data = io->head;
804 }
805 return io->head ? 0 : -ENOMEM;
806 }
807
808 static int pxa_irda_probe(struct platform_device *pdev)
809 {
810 struct net_device *dev;
811 struct pxa_irda *si;
812 unsigned int baudrate_mask;
813 int err;
814
815 if (!pdev->dev.platform_data)
816 return -ENODEV;
817
818 err = request_mem_region(__PREG(STUART), 0x24, "IrDA") ? 0 : -EBUSY;
819 if (err)
820 goto err_mem_1;
821
822 err = request_mem_region(__PREG(FICP), 0x1c, "IrDA") ? 0 : -EBUSY;
823 if (err)
824 goto err_mem_2;
825
826 dev = alloc_irdadev(sizeof(struct pxa_irda));
827 if (!dev)
828 goto err_mem_3;
829
830 si = netdev_priv(dev);
831 si->dev = &pdev->dev;
832 si->pdata = pdev->dev.platform_data;
833
834 si->sir_clk = clk_get(&pdev->dev, "UARTCLK");
835 si->fir_clk = clk_get(&pdev->dev, "FICPCLK");
836 if (IS_ERR(si->sir_clk) || IS_ERR(si->fir_clk)) {
837 err = PTR_ERR(IS_ERR(si->sir_clk) ? si->sir_clk : si->fir_clk);
838 goto err_mem_4;
839 }
840
841 /*
842 * Initialise the SIR buffers
843 */
844 err = pxa_irda_init_iobuf(&si->rx_buff, 14384);
845 if (err)
846 goto err_mem_4;
847 err = pxa_irda_init_iobuf(&si->tx_buff, 4000);
848 if (err)
849 goto err_mem_5;
850
851 if (si->pdata->startup)
852 err = si->pdata->startup(si->dev);
853 if (err)
854 goto err_startup;
855
856 dev->hard_start_xmit = pxa_irda_hard_xmit;
857 dev->open = pxa_irda_start;
858 dev->stop = pxa_irda_stop;
859 dev->do_ioctl = pxa_irda_ioctl;
860 dev->get_stats = pxa_irda_stats;
861
862 irda_init_max_qos_capabilies(&si->qos);
863
864 baudrate_mask = 0;
865 if (si->pdata->transceiver_cap & IR_SIRMODE)
866 baudrate_mask |= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
867 if (si->pdata->transceiver_cap & IR_FIRMODE)
868 baudrate_mask |= IR_4000000 << 8;
869
870 si->qos.baud_rate.bits &= baudrate_mask;
871 si->qos.min_turn_time.bits = 7; /* 1ms or more */
872
873 irda_qos_bits_to_value(&si->qos);
874
875 err = register_netdev(dev);
876
877 if (err == 0)
878 dev_set_drvdata(&pdev->dev, dev);
879
880 if (err) {
881 if (si->pdata->shutdown)
882 si->pdata->shutdown(si->dev);
883 err_startup:
884 kfree(si->tx_buff.head);
885 err_mem_5:
886 kfree(si->rx_buff.head);
887 err_mem_4:
888 if (si->sir_clk && !IS_ERR(si->sir_clk))
889 clk_put(si->sir_clk);
890 if (si->fir_clk && !IS_ERR(si->fir_clk))
891 clk_put(si->fir_clk);
892 free_netdev(dev);
893 err_mem_3:
894 release_mem_region(__PREG(FICP), 0x1c);
895 err_mem_2:
896 release_mem_region(__PREG(STUART), 0x24);
897 }
898 err_mem_1:
899 return err;
900 }
901
902 static int pxa_irda_remove(struct platform_device *_dev)
903 {
904 struct net_device *dev = platform_get_drvdata(_dev);
905
906 if (dev) {
907 struct pxa_irda *si = netdev_priv(dev);
908 unregister_netdev(dev);
909 if (si->pdata->shutdown)
910 si->pdata->shutdown(si->dev);
911 kfree(si->tx_buff.head);
912 kfree(si->rx_buff.head);
913 clk_put(si->fir_clk);
914 clk_put(si->sir_clk);
915 free_netdev(dev);
916 }
917
918 release_mem_region(__PREG(STUART), 0x24);
919 release_mem_region(__PREG(FICP), 0x1c);
920
921 return 0;
922 }
923
924 static struct platform_driver pxa_ir_driver = {
925 .driver = {
926 .name = "pxa2xx-ir",
927 .owner = THIS_MODULE,
928 },
929 .probe = pxa_irda_probe,
930 .remove = pxa_irda_remove,
931 .suspend = pxa_irda_suspend,
932 .resume = pxa_irda_resume,
933 };
934
935 static int __init pxa_irda_init(void)
936 {
937 return platform_driver_register(&pxa_ir_driver);
938 }
939
940 static void __exit pxa_irda_exit(void)
941 {
942 platform_driver_unregister(&pxa_ir_driver);
943 }
944
945 module_init(pxa_irda_init);
946 module_exit(pxa_irda_exit);
947
948 MODULE_LICENSE("GPL");
949 MODULE_ALIAS("platform:pxa2xx-ir");
Linux kernel - Deliverables
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