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hwmon: (max6650) Add support for alarms
[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/regs-uart.h>
28 #include <mach/regs-ost.h>
29
30 #define FICP __REG(0x40800000) /* Start of FICP area */
31 #define ICCR0 __REG(0x40800000) /* ICP Control Register 0 */
32 #define ICCR1 __REG(0x40800004) /* ICP Control Register 1 */
33 #define ICCR2 __REG(0x40800008) /* ICP Control Register 2 */
34 #define ICDR __REG(0x4080000c) /* ICP Data Register */
35 #define ICSR0 __REG(0x40800014) /* ICP Status Register 0 */
36 #define ICSR1 __REG(0x40800018) /* ICP Status Register 1 */
37
38 #define ICCR0_AME (1 << 7) /* Address match enable */
39 #define ICCR0_TIE (1 << 6) /* Transmit FIFO interrupt enable */
40 #define ICCR0_RIE (1 << 5) /* Recieve FIFO interrupt enable */
41 #define ICCR0_RXE (1 << 4) /* Receive enable */
42 #define ICCR0_TXE (1 << 3) /* Transmit enable */
43 #define ICCR0_TUS (1 << 2) /* Transmit FIFO underrun select */
44 #define ICCR0_LBM (1 << 1) /* Loopback mode */
45 #define ICCR0_ITR (1 << 0) /* IrDA transmission */
46
47 #define ICCR2_RXP (1 << 3) /* Receive Pin Polarity select */
48 #define ICCR2_TXP (1 << 2) /* Transmit Pin Polarity select */
49 #define ICCR2_TRIG (3 << 0) /* Receive FIFO Trigger threshold */
50 #define ICCR2_TRIG_8 (0 << 0) /* >= 8 bytes */
51 #define ICCR2_TRIG_16 (1 << 0) /* >= 16 bytes */
52 #define ICCR2_TRIG_32 (2 << 0) /* >= 32 bytes */
53
54 #ifdef CONFIG_PXA27x
55 #define ICSR0_EOC (1 << 6) /* DMA End of Descriptor Chain */
56 #endif
57 #define ICSR0_FRE (1 << 5) /* Framing error */
58 #define ICSR0_RFS (1 << 4) /* Receive FIFO service request */
59 #define ICSR0_TFS (1 << 3) /* Transnit FIFO service request */
60 #define ICSR0_RAB (1 << 2) /* Receiver abort */
61 #define ICSR0_TUR (1 << 1) /* Trunsmit FIFO underun */
62 #define ICSR0_EIF (1 << 0) /* End/Error in FIFO */
63
64 #define ICSR1_ROR (1 << 6) /* Receiver FIFO underrun */
65 #define ICSR1_CRE (1 << 5) /* CRC error */
66 #define ICSR1_EOF (1 << 4) /* End of frame */
67 #define ICSR1_TNF (1 << 3) /* Transmit FIFO not full */
68 #define ICSR1_RNE (1 << 2) /* Receive FIFO not empty */
69 #define ICSR1_TBY (1 << 1) /* Tramsmiter busy flag */
70 #define ICSR1_RSY (1 << 0) /* Recevier synchronized flag */
71
72 #define IrSR_RXPL_NEG_IS_ZERO (1<<4)
73 #define IrSR_RXPL_POS_IS_ZERO 0x0
74 #define IrSR_TXPL_NEG_IS_ZERO (1<<3)
75 #define IrSR_TXPL_POS_IS_ZERO 0x0
76 #define IrSR_XMODE_PULSE_1_6 (1<<2)
77 #define IrSR_XMODE_PULSE_3_16 0x0
78 #define IrSR_RCVEIR_IR_MODE (1<<1)
79 #define IrSR_RCVEIR_UART_MODE 0x0
80 #define IrSR_XMITIR_IR_MODE (1<<0)
81 #define IrSR_XMITIR_UART_MODE 0x0
82
83 #define IrSR_IR_RECEIVE_ON (\
84 IrSR_RXPL_NEG_IS_ZERO | \
85 IrSR_TXPL_POS_IS_ZERO | \
86 IrSR_XMODE_PULSE_3_16 | \
87 IrSR_RCVEIR_IR_MODE | \
88 IrSR_XMITIR_UART_MODE)
89
90 #define IrSR_IR_TRANSMIT_ON (\
91 IrSR_RXPL_NEG_IS_ZERO | \
92 IrSR_TXPL_POS_IS_ZERO | \
93 IrSR_XMODE_PULSE_3_16 | \
94 IrSR_RCVEIR_UART_MODE | \
95 IrSR_XMITIR_IR_MODE)
96
97 struct pxa_irda {
98 int speed;
99 int newspeed;
100 unsigned long last_oscr;
101
102 unsigned char *dma_rx_buff;
103 unsigned char *dma_tx_buff;
104 dma_addr_t dma_rx_buff_phy;
105 dma_addr_t dma_tx_buff_phy;
106 unsigned int dma_tx_buff_len;
107 int txdma;
108 int rxdma;
109
110 struct irlap_cb *irlap;
111 struct qos_info qos;
112
113 iobuff_t tx_buff;
114 iobuff_t rx_buff;
115
116 struct device *dev;
117 struct pxaficp_platform_data *pdata;
118 struct clk *fir_clk;
119 struct clk *sir_clk;
120 struct clk *cur_clk;
121 };
122
123 static inline void pxa_irda_disable_clk(struct pxa_irda *si)
124 {
125 if (si->cur_clk)
126 clk_disable(si->cur_clk);
127 si->cur_clk = NULL;
128 }
129
130 static inline void pxa_irda_enable_firclk(struct pxa_irda *si)
131 {
132 si->cur_clk = si->fir_clk;
133 clk_enable(si->fir_clk);
134 }
135
136 static inline void pxa_irda_enable_sirclk(struct pxa_irda *si)
137 {
138 si->cur_clk = si->sir_clk;
139 clk_enable(si->sir_clk);
140 }
141
142
143 #define IS_FIR(si) ((si)->speed >= 4000000)
144 #define IRDA_FRAME_SIZE_LIMIT 2047
145
146 inline static void pxa_irda_fir_dma_rx_start(struct pxa_irda *si)
147 {
148 DCSR(si->rxdma) = DCSR_NODESC;
149 DSADR(si->rxdma) = __PREG(ICDR);
150 DTADR(si->rxdma) = si->dma_rx_buff_phy;
151 DCMD(si->rxdma) = DCMD_INCTRGADDR | DCMD_FLOWSRC | DCMD_WIDTH1 | DCMD_BURST32 | IRDA_FRAME_SIZE_LIMIT;
152 DCSR(si->rxdma) |= DCSR_RUN;
153 }
154
155 inline static void pxa_irda_fir_dma_tx_start(struct pxa_irda *si)
156 {
157 DCSR(si->txdma) = DCSR_NODESC;
158 DSADR(si->txdma) = si->dma_tx_buff_phy;
159 DTADR(si->txdma) = __PREG(ICDR);
160 DCMD(si->txdma) = DCMD_INCSRCADDR | DCMD_FLOWTRG | DCMD_ENDIRQEN | DCMD_WIDTH1 | DCMD_BURST32 | si->dma_tx_buff_len;
161 DCSR(si->txdma) |= DCSR_RUN;
162 }
163
164 /*
165 * Set the IrDA communications speed.
166 */
167 static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
168 {
169 unsigned long flags;
170 unsigned int divisor;
171
172 switch (speed) {
173 case 9600: case 19200: case 38400:
174 case 57600: case 115200:
175
176 /* refer to PXA250/210 Developer's Manual 10-7 */
177 /* BaudRate = 14.7456 MHz / (16*Divisor) */
178 divisor = 14745600 / (16 * speed);
179
180 local_irq_save(flags);
181
182 if (IS_FIR(si)) {
183 /* stop RX DMA */
184 DCSR(si->rxdma) &= ~DCSR_RUN;
185 /* disable FICP */
186 ICCR0 = 0;
187 pxa_irda_disable_clk(si);
188
189 /* set board transceiver to SIR mode */
190 si->pdata->transceiver_mode(si->dev, IR_SIRMODE);
191
192 /* enable the STUART clock */
193 pxa_irda_enable_sirclk(si);
194 }
195
196 /* disable STUART first */
197 STIER = 0;
198
199 /* access DLL & DLH */
200 STLCR |= LCR_DLAB;
201 STDLL = divisor & 0xff;
202 STDLH = divisor >> 8;
203 STLCR &= ~LCR_DLAB;
204
205 si->speed = speed;
206 STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
207 STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
208
209 local_irq_restore(flags);
210 break;
211
212 case 4000000:
213 local_irq_save(flags);
214
215 /* disable STUART */
216 STIER = 0;
217 STISR = 0;
218 pxa_irda_disable_clk(si);
219
220 /* disable FICP first */
221 ICCR0 = 0;
222
223 /* set board transceiver to FIR mode */
224 si->pdata->transceiver_mode(si->dev, IR_FIRMODE);
225
226 /* enable the FICP clock */
227 pxa_irda_enable_firclk(si);
228
229 si->speed = speed;
230 pxa_irda_fir_dma_rx_start(si);
231 ICCR0 = ICCR0_ITR | ICCR0_RXE;
232
233 local_irq_restore(flags);
234 break;
235
236 default:
237 return -EINVAL;
238 }
239
240 return 0;
241 }
242
243 /* SIR interrupt service routine. */
244 static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
245 {
246 struct net_device *dev = dev_id;
247 struct pxa_irda *si = netdev_priv(dev);
248 int iir, lsr, data;
249
250 iir = STIIR;
251
252 switch (iir & 0x0F) {
253 case 0x06: /* Receiver Line Status */
254 lsr = STLSR;
255 while (lsr & LSR_FIFOE) {
256 data = STRBR;
257 if (lsr & (LSR_OE | LSR_PE | LSR_FE | LSR_BI)) {
258 printk(KERN_DEBUG "pxa_ir: sir receiving error\n");
259 dev->stats.rx_errors++;
260 if (lsr & LSR_FE)
261 dev->stats.rx_frame_errors++;
262 if (lsr & LSR_OE)
263 dev->stats.rx_fifo_errors++;
264 } else {
265 dev->stats.rx_bytes++;
266 async_unwrap_char(dev, &dev->stats,
267 &si->rx_buff, data);
268 }
269 lsr = STLSR;
270 }
271 si->last_oscr = OSCR;
272 break;
273
274 case 0x04: /* Received Data Available */
275 /* forth through */
276
277 case 0x0C: /* Character Timeout Indication */
278 do {
279 dev->stats.rx_bytes++;
280 async_unwrap_char(dev, &dev->stats, &si->rx_buff, STRBR);
281 } while (STLSR & LSR_DR);
282 si->last_oscr = OSCR;
283 break;
284
285 case 0x02: /* Transmit FIFO Data Request */
286 while ((si->tx_buff.len) && (STLSR & LSR_TDRQ)) {
287 STTHR = *si->tx_buff.data++;
288 si->tx_buff.len -= 1;
289 }
290
291 if (si->tx_buff.len == 0) {
292 dev->stats.tx_packets++;
293 dev->stats.tx_bytes += si->tx_buff.data - si->tx_buff.head;
294
295 /* We need to ensure that the transmitter has finished. */
296 while ((STLSR & LSR_TEMT) == 0)
297 cpu_relax();
298 si->last_oscr = OSCR;
299
300 /*
301 * Ok, we've finished transmitting. Now enable
302 * the receiver. Sometimes we get a receive IRQ
303 * immediately after a transmit...
304 */
305 if (si->newspeed) {
306 pxa_irda_set_speed(si, si->newspeed);
307 si->newspeed = 0;
308 } else {
309 /* enable IR Receiver, disable IR Transmitter */
310 STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
311 /* enable STUART and receive interrupts */
312 STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
313 }
314 /* I'm hungry! */
315 netif_wake_queue(dev);
316 }
317 break;
318 }
319
320 return IRQ_HANDLED;
321 }
322
323 /* FIR Receive DMA interrupt handler */
324 static void pxa_irda_fir_dma_rx_irq(int channel, void *data)
325 {
326 int dcsr = DCSR(channel);
327
328 DCSR(channel) = dcsr & ~DCSR_RUN;
329
330 printk(KERN_DEBUG "pxa_ir: fir rx dma bus error %#x\n", dcsr);
331 }
332
333 /* FIR Transmit DMA interrupt handler */
334 static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
335 {
336 struct net_device *dev = data;
337 struct pxa_irda *si = netdev_priv(dev);
338 int dcsr;
339
340 dcsr = DCSR(channel);
341 DCSR(channel) = dcsr & ~DCSR_RUN;
342
343 if (dcsr & DCSR_ENDINTR) {
344 dev->stats.tx_packets++;
345 dev->stats.tx_bytes += si->dma_tx_buff_len;
346 } else {
347 dev->stats.tx_errors++;
348 }
349
350 while (ICSR1 & ICSR1_TBY)
351 cpu_relax();
352 si->last_oscr = OSCR;
353
354 /*
355 * HACK: It looks like the TBY bit is dropped too soon.
356 * Without this delay things break.
357 */
358 udelay(120);
359
360 if (si->newspeed) {
361 pxa_irda_set_speed(si, si->newspeed);
362 si->newspeed = 0;
363 } else {
364 int i = 64;
365
366 ICCR0 = 0;
367 pxa_irda_fir_dma_rx_start(si);
368 while ((ICSR1 & ICSR1_RNE) && i--)
369 (void)ICDR;
370 ICCR0 = ICCR0_ITR | ICCR0_RXE;
371
372 if (i < 0)
373 printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
374 }
375 netif_wake_queue(dev);
376 }
377
378 /* EIF(Error in FIFO/End in Frame) handler for FIR */
379 static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev, int icsr0)
380 {
381 unsigned int len, stat, data;
382
383 /* Get the current data position. */
384 len = DTADR(si->rxdma) - si->dma_rx_buff_phy;
385
386 do {
387 /* Read Status, and then Data. */
388 stat = ICSR1;
389 rmb();
390 data = ICDR;
391
392 if (stat & (ICSR1_CRE | ICSR1_ROR)) {
393 dev->stats.rx_errors++;
394 if (stat & ICSR1_CRE) {
395 printk(KERN_DEBUG "pxa_ir: fir receive CRC error\n");
396 dev->stats.rx_crc_errors++;
397 }
398 if (stat & ICSR1_ROR) {
399 printk(KERN_DEBUG "pxa_ir: fir receive overrun\n");
400 dev->stats.rx_over_errors++;
401 }
402 } else {
403 si->dma_rx_buff[len++] = data;
404 }
405 /* If we hit the end of frame, there's no point in continuing. */
406 if (stat & ICSR1_EOF)
407 break;
408 } while (ICSR0 & ICSR0_EIF);
409
410 if (stat & ICSR1_EOF) {
411 /* end of frame. */
412 struct sk_buff *skb;
413
414 if (icsr0 & ICSR0_FRE) {
415 printk(KERN_ERR "pxa_ir: dropping erroneous frame\n");
416 dev->stats.rx_dropped++;
417 return;
418 }
419
420 skb = alloc_skb(len+1,GFP_ATOMIC);
421 if (!skb) {
422 printk(KERN_ERR "pxa_ir: fir out of memory for receive skb\n");
423 dev->stats.rx_dropped++;
424 return;
425 }
426
427 /* Align IP header to 20 bytes */
428 skb_reserve(skb, 1);
429 skb_copy_to_linear_data(skb, si->dma_rx_buff, len);
430 skb_put(skb, len);
431
432 /* Feed it to IrLAP */
433 skb->dev = dev;
434 skb_reset_mac_header(skb);
435 skb->protocol = htons(ETH_P_IRDA);
436 netif_rx(skb);
437
438 dev->stats.rx_packets++;
439 dev->stats.rx_bytes += len;
440 }
441 }
442
443 /* FIR interrupt handler */
444 static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
445 {
446 struct net_device *dev = dev_id;
447 struct pxa_irda *si = netdev_priv(dev);
448 int icsr0, i = 64;
449
450 /* stop RX DMA */
451 DCSR(si->rxdma) &= ~DCSR_RUN;
452 si->last_oscr = OSCR;
453 icsr0 = ICSR0;
454
455 if (icsr0 & (ICSR0_FRE | ICSR0_RAB)) {
456 if (icsr0 & ICSR0_FRE) {
457 printk(KERN_DEBUG "pxa_ir: fir receive frame error\n");
458 dev->stats.rx_frame_errors++;
459 } else {
460 printk(KERN_DEBUG "pxa_ir: fir receive abort\n");
461 dev->stats.rx_errors++;
462 }
463 ICSR0 = icsr0 & (ICSR0_FRE | ICSR0_RAB);
464 }
465
466 if (icsr0 & ICSR0_EIF) {
467 /* An error in FIFO occured, or there is a end of frame */
468 pxa_irda_fir_irq_eif(si, dev, icsr0);
469 }
470
471 ICCR0 = 0;
472 pxa_irda_fir_dma_rx_start(si);
473 while ((ICSR1 & ICSR1_RNE) && i--)
474 (void)ICDR;
475 ICCR0 = ICCR0_ITR | ICCR0_RXE;
476
477 if (i < 0)
478 printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
479
480 return IRQ_HANDLED;
481 }
482
483 /* hard_xmit interface of irda device */
484 static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
485 {
486 struct pxa_irda *si = netdev_priv(dev);
487 int speed = irda_get_next_speed(skb);
488
489 /*
490 * Does this packet contain a request to change the interface
491 * speed? If so, remember it until we complete the transmission
492 * of this frame.
493 */
494 if (speed != si->speed && speed != -1)
495 si->newspeed = speed;
496
497 /*
498 * If this is an empty frame, we can bypass a lot.
499 */
500 if (skb->len == 0) {
501 if (si->newspeed) {
502 si->newspeed = 0;
503 pxa_irda_set_speed(si, speed);
504 }
505 dev_kfree_skb(skb);
506 return 0;
507 }
508
509 netif_stop_queue(dev);
510
511 if (!IS_FIR(si)) {
512 si->tx_buff.data = si->tx_buff.head;
513 si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data, si->tx_buff.truesize);
514
515 /* Disable STUART interrupts and switch to transmit mode. */
516 STIER = 0;
517 STISR = IrSR_IR_TRANSMIT_ON | IrSR_XMODE_PULSE_1_6;
518
519 /* enable STUART and transmit interrupts */
520 STIER = IER_UUE | IER_TIE;
521 } else {
522 unsigned long mtt = irda_get_mtt(skb);
523
524 si->dma_tx_buff_len = skb->len;
525 skb_copy_from_linear_data(skb, si->dma_tx_buff, skb->len);
526
527 if (mtt)
528 while ((unsigned)(OSCR - si->last_oscr)/4 < mtt)
529 cpu_relax();
530
531 /* stop RX DMA, disable FICP */
532 DCSR(si->rxdma) &= ~DCSR_RUN;
533 ICCR0 = 0;
534
535 pxa_irda_fir_dma_tx_start(si);
536 ICCR0 = ICCR0_ITR | ICCR0_TXE;
537 }
538
539 dev_kfree_skb(skb);
540 dev->trans_start = jiffies;
541 return 0;
542 }
543
544 static int pxa_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
545 {
546 struct if_irda_req *rq = (struct if_irda_req *)ifreq;
547 struct pxa_irda *si = netdev_priv(dev);
548 int ret;
549
550 switch (cmd) {
551 case SIOCSBANDWIDTH:
552 ret = -EPERM;
553 if (capable(CAP_NET_ADMIN)) {
554 /*
555 * We are unable to set the speed if the
556 * device is not running.
557 */
558 if (netif_running(dev)) {
559 ret = pxa_irda_set_speed(si,
560 rq->ifr_baudrate);
561 } else {
562 printk(KERN_INFO "pxa_ir: SIOCSBANDWIDTH: !netif_running\n");
563 ret = 0;
564 }
565 }
566 break;
567
568 case SIOCSMEDIABUSY:
569 ret = -EPERM;
570 if (capable(CAP_NET_ADMIN)) {
571 irda_device_set_media_busy(dev, TRUE);
572 ret = 0;
573 }
574 break;
575
576 case SIOCGRECEIVING:
577 ret = 0;
578 rq->ifr_receiving = IS_FIR(si) ? 0
579 : si->rx_buff.state != OUTSIDE_FRAME;
580 break;
581
582 default:
583 ret = -EOPNOTSUPP;
584 break;
585 }
586
587 return ret;
588 }
589
590 static void pxa_irda_startup(struct pxa_irda *si)
591 {
592 /* Disable STUART interrupts */
593 STIER = 0;
594 /* enable STUART interrupt to the processor */
595 STMCR = MCR_OUT2;
596 /* configure SIR frame format: StartBit - Data 7 ... Data 0 - Stop Bit */
597 STLCR = LCR_WLS0 | LCR_WLS1;
598 /* enable FIFO, we use FIFO to improve performance */
599 STFCR = FCR_TRFIFOE | FCR_ITL_32;
600
601 /* disable FICP */
602 ICCR0 = 0;
603 /* configure FICP ICCR2 */
604 ICCR2 = ICCR2_TXP | ICCR2_TRIG_32;
605
606 /* configure DMAC */
607 DRCMR(17) = si->rxdma | DRCMR_MAPVLD;
608 DRCMR(18) = si->txdma | DRCMR_MAPVLD;
609
610 /* force SIR reinitialization */
611 si->speed = 4000000;
612 pxa_irda_set_speed(si, 9600);
613
614 printk(KERN_DEBUG "pxa_ir: irda startup\n");
615 }
616
617 static void pxa_irda_shutdown(struct pxa_irda *si)
618 {
619 unsigned long flags;
620
621 local_irq_save(flags);
622
623 /* disable STUART and interrupt */
624 STIER = 0;
625 /* disable STUART SIR mode */
626 STISR = 0;
627
628 /* disable DMA */
629 DCSR(si->txdma) &= ~DCSR_RUN;
630 DCSR(si->rxdma) &= ~DCSR_RUN;
631 /* disable FICP */
632 ICCR0 = 0;
633
634 /* disable the STUART or FICP clocks */
635 pxa_irda_disable_clk(si);
636
637 DRCMR(17) = 0;
638 DRCMR(18) = 0;
639
640 local_irq_restore(flags);
641
642 /* power off board transceiver */
643 si->pdata->transceiver_mode(si->dev, IR_OFF);
644
645 printk(KERN_DEBUG "pxa_ir: irda shutdown\n");
646 }
647
648 static int pxa_irda_start(struct net_device *dev)
649 {
650 struct pxa_irda *si = netdev_priv(dev);
651 int err;
652
653 si->speed = 9600;
654
655 err = request_irq(IRQ_STUART, pxa_irda_sir_irq, 0, dev->name, dev);
656 if (err)
657 goto err_irq1;
658
659 err = request_irq(IRQ_ICP, pxa_irda_fir_irq, 0, dev->name, dev);
660 if (err)
661 goto err_irq2;
662
663 /*
664 * The interrupt must remain disabled for now.
665 */
666 disable_irq(IRQ_STUART);
667 disable_irq(IRQ_ICP);
668
669 err = -EBUSY;
670 si->rxdma = pxa_request_dma("FICP_RX",DMA_PRIO_LOW, pxa_irda_fir_dma_rx_irq, dev);
671 if (si->rxdma < 0)
672 goto err_rx_dma;
673
674 si->txdma = pxa_request_dma("FICP_TX",DMA_PRIO_LOW, pxa_irda_fir_dma_tx_irq, dev);
675 if (si->txdma < 0)
676 goto err_tx_dma;
677
678 err = -ENOMEM;
679 si->dma_rx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
680 &si->dma_rx_buff_phy, GFP_KERNEL );
681 if (!si->dma_rx_buff)
682 goto err_dma_rx_buff;
683
684 si->dma_tx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
685 &si->dma_tx_buff_phy, GFP_KERNEL );
686 if (!si->dma_tx_buff)
687 goto err_dma_tx_buff;
688
689 /* Setup the serial port for the initial speed. */
690 pxa_irda_startup(si);
691
692 /*
693 * Open a new IrLAP layer instance.
694 */
695 si->irlap = irlap_open(dev, &si->qos, "pxa");
696 err = -ENOMEM;
697 if (!si->irlap)
698 goto err_irlap;
699
700 /*
701 * Now enable the interrupt and start the queue
702 */
703 enable_irq(IRQ_STUART);
704 enable_irq(IRQ_ICP);
705 netif_start_queue(dev);
706
707 printk(KERN_DEBUG "pxa_ir: irda driver opened\n");
708
709 return 0;
710
711 err_irlap:
712 pxa_irda_shutdown(si);
713 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
714 err_dma_tx_buff:
715 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
716 err_dma_rx_buff:
717 pxa_free_dma(si->txdma);
718 err_tx_dma:
719 pxa_free_dma(si->rxdma);
720 err_rx_dma:
721 free_irq(IRQ_ICP, dev);
722 err_irq2:
723 free_irq(IRQ_STUART, dev);
724 err_irq1:
725
726 return err;
727 }
728
729 static int pxa_irda_stop(struct net_device *dev)
730 {
731 struct pxa_irda *si = netdev_priv(dev);
732
733 netif_stop_queue(dev);
734
735 pxa_irda_shutdown(si);
736
737 /* Stop IrLAP */
738 if (si->irlap) {
739 irlap_close(si->irlap);
740 si->irlap = NULL;
741 }
742
743 free_irq(IRQ_STUART, dev);
744 free_irq(IRQ_ICP, dev);
745
746 pxa_free_dma(si->rxdma);
747 pxa_free_dma(si->txdma);
748
749 if (si->dma_rx_buff)
750 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
751 if (si->dma_tx_buff)
752 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
753
754 printk(KERN_DEBUG "pxa_ir: irda driver closed\n");
755 return 0;
756 }
757
758 static int pxa_irda_suspend(struct platform_device *_dev, pm_message_t state)
759 {
760 struct net_device *dev = platform_get_drvdata(_dev);
761 struct pxa_irda *si;
762
763 if (dev && netif_running(dev)) {
764 si = netdev_priv(dev);
765 netif_device_detach(dev);
766 pxa_irda_shutdown(si);
767 }
768
769 return 0;
770 }
771
772 static int pxa_irda_resume(struct platform_device *_dev)
773 {
774 struct net_device *dev = platform_get_drvdata(_dev);
775 struct pxa_irda *si;
776
777 if (dev && netif_running(dev)) {
778 si = netdev_priv(dev);
779 pxa_irda_startup(si);
780 netif_device_attach(dev);
781 netif_wake_queue(dev);
782 }
783
784 return 0;
785 }
786
787
788 static int pxa_irda_init_iobuf(iobuff_t *io, int size)
789 {
790 io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
791 if (io->head != NULL) {
792 io->truesize = size;
793 io->in_frame = FALSE;
794 io->state = OUTSIDE_FRAME;
795 io->data = io->head;
796 }
797 return io->head ? 0 : -ENOMEM;
798 }
799
800 static int pxa_irda_probe(struct platform_device *pdev)
801 {
802 struct net_device *dev;
803 struct pxa_irda *si;
804 unsigned int baudrate_mask;
805 int err;
806
807 if (!pdev->dev.platform_data)
808 return -ENODEV;
809
810 err = request_mem_region(__PREG(STUART), 0x24, "IrDA") ? 0 : -EBUSY;
811 if (err)
812 goto err_mem_1;
813
814 err = request_mem_region(__PREG(FICP), 0x1c, "IrDA") ? 0 : -EBUSY;
815 if (err)
816 goto err_mem_2;
817
818 dev = alloc_irdadev(sizeof(struct pxa_irda));
819 if (!dev)
820 goto err_mem_3;
821
822 si = netdev_priv(dev);
823 si->dev = &pdev->dev;
824 si->pdata = pdev->dev.platform_data;
825
826 si->sir_clk = clk_get(&pdev->dev, "UARTCLK");
827 si->fir_clk = clk_get(&pdev->dev, "FICPCLK");
828 if (IS_ERR(si->sir_clk) || IS_ERR(si->fir_clk)) {
829 err = PTR_ERR(IS_ERR(si->sir_clk) ? si->sir_clk : si->fir_clk);
830 goto err_mem_4;
831 }
832
833 /*
834 * Initialise the SIR buffers
835 */
836 err = pxa_irda_init_iobuf(&si->rx_buff, 14384);
837 if (err)
838 goto err_mem_4;
839 err = pxa_irda_init_iobuf(&si->tx_buff, 4000);
840 if (err)
841 goto err_mem_5;
842
843 if (si->pdata->startup)
844 err = si->pdata->startup(si->dev);
845 if (err)
846 goto err_startup;
847
848 dev->hard_start_xmit = pxa_irda_hard_xmit;
849 dev->open = pxa_irda_start;
850 dev->stop = pxa_irda_stop;
851 dev->do_ioctl = pxa_irda_ioctl;
852
853 irda_init_max_qos_capabilies(&si->qos);
854
855 baudrate_mask = 0;
856 if (si->pdata->transceiver_cap & IR_SIRMODE)
857 baudrate_mask |= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
858 if (si->pdata->transceiver_cap & IR_FIRMODE)
859 baudrate_mask |= IR_4000000 << 8;
860
861 si->qos.baud_rate.bits &= baudrate_mask;
862 si->qos.min_turn_time.bits = 7; /* 1ms or more */
863
864 irda_qos_bits_to_value(&si->qos);
865
866 err = register_netdev(dev);
867
868 if (err == 0)
869 dev_set_drvdata(&pdev->dev, dev);
870
871 if (err) {
872 if (si->pdata->shutdown)
873 si->pdata->shutdown(si->dev);
874 err_startup:
875 kfree(si->tx_buff.head);
876 err_mem_5:
877 kfree(si->rx_buff.head);
878 err_mem_4:
879 if (si->sir_clk && !IS_ERR(si->sir_clk))
880 clk_put(si->sir_clk);
881 if (si->fir_clk && !IS_ERR(si->fir_clk))
882 clk_put(si->fir_clk);
883 free_netdev(dev);
884 err_mem_3:
885 release_mem_region(__PREG(FICP), 0x1c);
886 err_mem_2:
887 release_mem_region(__PREG(STUART), 0x24);
888 }
889 err_mem_1:
890 return err;
891 }
892
893 static int pxa_irda_remove(struct platform_device *_dev)
894 {
895 struct net_device *dev = platform_get_drvdata(_dev);
896
897 if (dev) {
898 struct pxa_irda *si = netdev_priv(dev);
899 unregister_netdev(dev);
900 if (si->pdata->shutdown)
901 si->pdata->shutdown(si->dev);
902 kfree(si->tx_buff.head);
903 kfree(si->rx_buff.head);
904 clk_put(si->fir_clk);
905 clk_put(si->sir_clk);
906 free_netdev(dev);
907 }
908
909 release_mem_region(__PREG(STUART), 0x24);
910 release_mem_region(__PREG(FICP), 0x1c);
911
912 return 0;
913 }
914
915 static struct platform_driver pxa_ir_driver = {
916 .driver = {
917 .name = "pxa2xx-ir",
918 .owner = THIS_MODULE,
919 },
920 .probe = pxa_irda_probe,
921 .remove = pxa_irda_remove,
922 .suspend = pxa_irda_suspend,
923 .resume = pxa_irda_resume,
924 };
925
926 static int __init pxa_irda_init(void)
927 {
928 return platform_driver_register(&pxa_ir_driver);
929 }
930
931 static void __exit pxa_irda_exit(void)
932 {
933 platform_driver_unregister(&pxa_ir_driver);
934 }
935
936 module_init(pxa_irda_init);
937 module_exit(pxa_irda_exit);
938
939 MODULE_LICENSE("GPL");
940 MODULE_ALIAS("platform:pxa2xx-ir");
Linux kernel - Deliverables
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