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[mirror_ubuntu-zesty-kernel.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/etherdevice.h>
18 #include <linux/platform_device.h>
19 #include <linux/clk.h>
20 #include <linux/gpio.h>
21 #include <linux/slab.h>
22
23 #include <net/irda/irda.h>
24 #include <net/irda/irmod.h>
25 #include <net/irda/wrapper.h>
26 #include <net/irda/irda_device.h>
27
28 #include <mach/dma.h>
29 #include <mach/irda.h>
30 #include <mach/regs-uart.h>
31 #include <mach/regs-ost.h>
32
33 #define FICP __REG(0x40800000) /* Start of FICP area */
34 #define ICCR0 __REG(0x40800000) /* ICP Control Register 0 */
35 #define ICCR1 __REG(0x40800004) /* ICP Control Register 1 */
36 #define ICCR2 __REG(0x40800008) /* ICP Control Register 2 */
37 #define ICDR __REG(0x4080000c) /* ICP Data Register */
38 #define ICSR0 __REG(0x40800014) /* ICP Status Register 0 */
39 #define ICSR1 __REG(0x40800018) /* ICP Status Register 1 */
40
41 #define ICCR0_AME (1 << 7) /* Address match enable */
42 #define ICCR0_TIE (1 << 6) /* Transmit FIFO interrupt enable */
43 #define ICCR0_RIE (1 << 5) /* Recieve FIFO interrupt enable */
44 #define ICCR0_RXE (1 << 4) /* Receive enable */
45 #define ICCR0_TXE (1 << 3) /* Transmit enable */
46 #define ICCR0_TUS (1 << 2) /* Transmit FIFO underrun select */
47 #define ICCR0_LBM (1 << 1) /* Loopback mode */
48 #define ICCR0_ITR (1 << 0) /* IrDA transmission */
49
50 #define ICCR2_RXP (1 << 3) /* Receive Pin Polarity select */
51 #define ICCR2_TXP (1 << 2) /* Transmit Pin Polarity select */
52 #define ICCR2_TRIG (3 << 0) /* Receive FIFO Trigger threshold */
53 #define ICCR2_TRIG_8 (0 << 0) /* >= 8 bytes */
54 #define ICCR2_TRIG_16 (1 << 0) /* >= 16 bytes */
55 #define ICCR2_TRIG_32 (2 << 0) /* >= 32 bytes */
56
57 #ifdef CONFIG_PXA27x
58 #define ICSR0_EOC (1 << 6) /* DMA End of Descriptor Chain */
59 #endif
60 #define ICSR0_FRE (1 << 5) /* Framing error */
61 #define ICSR0_RFS (1 << 4) /* Receive FIFO service request */
62 #define ICSR0_TFS (1 << 3) /* Transnit FIFO service request */
63 #define ICSR0_RAB (1 << 2) /* Receiver abort */
64 #define ICSR0_TUR (1 << 1) /* Trunsmit FIFO underun */
65 #define ICSR0_EIF (1 << 0) /* End/Error in FIFO */
66
67 #define ICSR1_ROR (1 << 6) /* Receiver FIFO underrun */
68 #define ICSR1_CRE (1 << 5) /* CRC error */
69 #define ICSR1_EOF (1 << 4) /* End of frame */
70 #define ICSR1_TNF (1 << 3) /* Transmit FIFO not full */
71 #define ICSR1_RNE (1 << 2) /* Receive FIFO not empty */
72 #define ICSR1_TBY (1 << 1) /* Tramsmiter busy flag */
73 #define ICSR1_RSY (1 << 0) /* Recevier synchronized flag */
74
75 #define IrSR_RXPL_NEG_IS_ZERO (1<<4)
76 #define IrSR_RXPL_POS_IS_ZERO 0x0
77 #define IrSR_TXPL_NEG_IS_ZERO (1<<3)
78 #define IrSR_TXPL_POS_IS_ZERO 0x0
79 #define IrSR_XMODE_PULSE_1_6 (1<<2)
80 #define IrSR_XMODE_PULSE_3_16 0x0
81 #define IrSR_RCVEIR_IR_MODE (1<<1)
82 #define IrSR_RCVEIR_UART_MODE 0x0
83 #define IrSR_XMITIR_IR_MODE (1<<0)
84 #define IrSR_XMITIR_UART_MODE 0x0
85
86 #define IrSR_IR_RECEIVE_ON (\
87 IrSR_RXPL_NEG_IS_ZERO | \
88 IrSR_TXPL_POS_IS_ZERO | \
89 IrSR_XMODE_PULSE_3_16 | \
90 IrSR_RCVEIR_IR_MODE | \
91 IrSR_XMITIR_UART_MODE)
92
93 #define IrSR_IR_TRANSMIT_ON (\
94 IrSR_RXPL_NEG_IS_ZERO | \
95 IrSR_TXPL_POS_IS_ZERO | \
96 IrSR_XMODE_PULSE_3_16 | \
97 IrSR_RCVEIR_UART_MODE | \
98 IrSR_XMITIR_IR_MODE)
99
100 struct pxa_irda {
101 int speed;
102 int newspeed;
103 unsigned long last_oscr;
104
105 unsigned char *dma_rx_buff;
106 unsigned char *dma_tx_buff;
107 dma_addr_t dma_rx_buff_phy;
108 dma_addr_t dma_tx_buff_phy;
109 unsigned int dma_tx_buff_len;
110 int txdma;
111 int rxdma;
112
113 struct irlap_cb *irlap;
114 struct qos_info qos;
115
116 iobuff_t tx_buff;
117 iobuff_t rx_buff;
118
119 struct device *dev;
120 struct pxaficp_platform_data *pdata;
121 struct clk *fir_clk;
122 struct clk *sir_clk;
123 struct clk *cur_clk;
124 };
125
126 static inline void pxa_irda_disable_clk(struct pxa_irda *si)
127 {
128 if (si->cur_clk)
129 clk_disable(si->cur_clk);
130 si->cur_clk = NULL;
131 }
132
133 static inline void pxa_irda_enable_firclk(struct pxa_irda *si)
134 {
135 si->cur_clk = si->fir_clk;
136 clk_enable(si->fir_clk);
137 }
138
139 static inline void pxa_irda_enable_sirclk(struct pxa_irda *si)
140 {
141 si->cur_clk = si->sir_clk;
142 clk_enable(si->sir_clk);
143 }
144
145
146 #define IS_FIR(si) ((si)->speed >= 4000000)
147 #define IRDA_FRAME_SIZE_LIMIT 2047
148
149 inline static void pxa_irda_fir_dma_rx_start(struct pxa_irda *si)
150 {
151 DCSR(si->rxdma) = DCSR_NODESC;
152 DSADR(si->rxdma) = __PREG(ICDR);
153 DTADR(si->rxdma) = si->dma_rx_buff_phy;
154 DCMD(si->rxdma) = DCMD_INCTRGADDR | DCMD_FLOWSRC | DCMD_WIDTH1 | DCMD_BURST32 | IRDA_FRAME_SIZE_LIMIT;
155 DCSR(si->rxdma) |= DCSR_RUN;
156 }
157
158 inline static void pxa_irda_fir_dma_tx_start(struct pxa_irda *si)
159 {
160 DCSR(si->txdma) = DCSR_NODESC;
161 DSADR(si->txdma) = si->dma_tx_buff_phy;
162 DTADR(si->txdma) = __PREG(ICDR);
163 DCMD(si->txdma) = DCMD_INCSRCADDR | DCMD_FLOWTRG | DCMD_ENDIRQEN | DCMD_WIDTH1 | DCMD_BURST32 | si->dma_tx_buff_len;
164 DCSR(si->txdma) |= DCSR_RUN;
165 }
166
167 /*
168 * Set the IrDA communications mode.
169 */
170 static void pxa_irda_set_mode(struct pxa_irda *si, int mode)
171 {
172 if (si->pdata->transceiver_mode)
173 si->pdata->transceiver_mode(si->dev, mode);
174 else {
175 if (gpio_is_valid(si->pdata->gpio_pwdown))
176 gpio_set_value(si->pdata->gpio_pwdown,
177 !(mode & IR_OFF) ^
178 !si->pdata->gpio_pwdown_inverted);
179 pxa2xx_transceiver_mode(si->dev, mode);
180 }
181 }
182
183 /*
184 * Set the IrDA communications speed.
185 */
186 static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
187 {
188 unsigned long flags;
189 unsigned int divisor;
190
191 switch (speed) {
192 case 9600: case 19200: case 38400:
193 case 57600: case 115200:
194
195 /* refer to PXA250/210 Developer's Manual 10-7 */
196 /* BaudRate = 14.7456 MHz / (16*Divisor) */
197 divisor = 14745600 / (16 * speed);
198
199 local_irq_save(flags);
200
201 if (IS_FIR(si)) {
202 /* stop RX DMA */
203 DCSR(si->rxdma) &= ~DCSR_RUN;
204 /* disable FICP */
205 ICCR0 = 0;
206 pxa_irda_disable_clk(si);
207
208 /* set board transceiver to SIR mode */
209 pxa_irda_set_mode(si, IR_SIRMODE);
210
211 /* enable the STUART clock */
212 pxa_irda_enable_sirclk(si);
213 }
214
215 /* disable STUART first */
216 STIER = 0;
217
218 /* access DLL & DLH */
219 STLCR |= LCR_DLAB;
220 STDLL = divisor & 0xff;
221 STDLH = divisor >> 8;
222 STLCR &= ~LCR_DLAB;
223
224 si->speed = speed;
225 STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
226 STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
227
228 local_irq_restore(flags);
229 break;
230
231 case 4000000:
232 local_irq_save(flags);
233
234 /* disable STUART */
235 STIER = 0;
236 STISR = 0;
237 pxa_irda_disable_clk(si);
238
239 /* disable FICP first */
240 ICCR0 = 0;
241
242 /* set board transceiver to FIR mode */
243 pxa_irda_set_mode(si, IR_FIRMODE);
244
245 /* enable the FICP clock */
246 pxa_irda_enable_firclk(si);
247
248 si->speed = speed;
249 pxa_irda_fir_dma_rx_start(si);
250 ICCR0 = ICCR0_ITR | ICCR0_RXE;
251
252 local_irq_restore(flags);
253 break;
254
255 default:
256 return -EINVAL;
257 }
258
259 return 0;
260 }
261
262 /* SIR interrupt service routine. */
263 static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
264 {
265 struct net_device *dev = dev_id;
266 struct pxa_irda *si = netdev_priv(dev);
267 int iir, lsr, data;
268
269 iir = STIIR;
270
271 switch (iir & 0x0F) {
272 case 0x06: /* Receiver Line Status */
273 lsr = STLSR;
274 while (lsr & LSR_FIFOE) {
275 data = STRBR;
276 if (lsr & (LSR_OE | LSR_PE | LSR_FE | LSR_BI)) {
277 printk(KERN_DEBUG "pxa_ir: sir receiving error\n");
278 dev->stats.rx_errors++;
279 if (lsr & LSR_FE)
280 dev->stats.rx_frame_errors++;
281 if (lsr & LSR_OE)
282 dev->stats.rx_fifo_errors++;
283 } else {
284 dev->stats.rx_bytes++;
285 async_unwrap_char(dev, &dev->stats,
286 &si->rx_buff, data);
287 }
288 lsr = STLSR;
289 }
290 si->last_oscr = OSCR;
291 break;
292
293 case 0x04: /* Received Data Available */
294 /* forth through */
295
296 case 0x0C: /* Character Timeout Indication */
297 do {
298 dev->stats.rx_bytes++;
299 async_unwrap_char(dev, &dev->stats, &si->rx_buff, STRBR);
300 } while (STLSR & LSR_DR);
301 si->last_oscr = OSCR;
302 break;
303
304 case 0x02: /* Transmit FIFO Data Request */
305 while ((si->tx_buff.len) && (STLSR & LSR_TDRQ)) {
306 STTHR = *si->tx_buff.data++;
307 si->tx_buff.len -= 1;
308 }
309
310 if (si->tx_buff.len == 0) {
311 dev->stats.tx_packets++;
312 dev->stats.tx_bytes += si->tx_buff.data - si->tx_buff.head;
313
314 /* We need to ensure that the transmitter has finished. */
315 while ((STLSR & LSR_TEMT) == 0)
316 cpu_relax();
317 si->last_oscr = OSCR;
318
319 /*
320 * Ok, we've finished transmitting. Now enable
321 * the receiver. Sometimes we get a receive IRQ
322 * immediately after a transmit...
323 */
324 if (si->newspeed) {
325 pxa_irda_set_speed(si, si->newspeed);
326 si->newspeed = 0;
327 } else {
328 /* enable IR Receiver, disable IR Transmitter */
329 STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
330 /* enable STUART and receive interrupts */
331 STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
332 }
333 /* I'm hungry! */
334 netif_wake_queue(dev);
335 }
336 break;
337 }
338
339 return IRQ_HANDLED;
340 }
341
342 /* FIR Receive DMA interrupt handler */
343 static void pxa_irda_fir_dma_rx_irq(int channel, void *data)
344 {
345 int dcsr = DCSR(channel);
346
347 DCSR(channel) = dcsr & ~DCSR_RUN;
348
349 printk(KERN_DEBUG "pxa_ir: fir rx dma bus error %#x\n", dcsr);
350 }
351
352 /* FIR Transmit DMA interrupt handler */
353 static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
354 {
355 struct net_device *dev = data;
356 struct pxa_irda *si = netdev_priv(dev);
357 int dcsr;
358
359 dcsr = DCSR(channel);
360 DCSR(channel) = dcsr & ~DCSR_RUN;
361
362 if (dcsr & DCSR_ENDINTR) {
363 dev->stats.tx_packets++;
364 dev->stats.tx_bytes += si->dma_tx_buff_len;
365 } else {
366 dev->stats.tx_errors++;
367 }
368
369 while (ICSR1 & ICSR1_TBY)
370 cpu_relax();
371 si->last_oscr = OSCR;
372
373 /*
374 * HACK: It looks like the TBY bit is dropped too soon.
375 * Without this delay things break.
376 */
377 udelay(120);
378
379 if (si->newspeed) {
380 pxa_irda_set_speed(si, si->newspeed);
381 si->newspeed = 0;
382 } else {
383 int i = 64;
384
385 ICCR0 = 0;
386 pxa_irda_fir_dma_rx_start(si);
387 while ((ICSR1 & ICSR1_RNE) && i--)
388 (void)ICDR;
389 ICCR0 = ICCR0_ITR | ICCR0_RXE;
390
391 if (i < 0)
392 printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
393 }
394 netif_wake_queue(dev);
395 }
396
397 /* EIF(Error in FIFO/End in Frame) handler for FIR */
398 static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev, int icsr0)
399 {
400 unsigned int len, stat, data;
401
402 /* Get the current data position. */
403 len = DTADR(si->rxdma) - si->dma_rx_buff_phy;
404
405 do {
406 /* Read Status, and then Data. */
407 stat = ICSR1;
408 rmb();
409 data = ICDR;
410
411 if (stat & (ICSR1_CRE | ICSR1_ROR)) {
412 dev->stats.rx_errors++;
413 if (stat & ICSR1_CRE) {
414 printk(KERN_DEBUG "pxa_ir: fir receive CRC error\n");
415 dev->stats.rx_crc_errors++;
416 }
417 if (stat & ICSR1_ROR) {
418 printk(KERN_DEBUG "pxa_ir: fir receive overrun\n");
419 dev->stats.rx_over_errors++;
420 }
421 } else {
422 si->dma_rx_buff[len++] = data;
423 }
424 /* If we hit the end of frame, there's no point in continuing. */
425 if (stat & ICSR1_EOF)
426 break;
427 } while (ICSR0 & ICSR0_EIF);
428
429 if (stat & ICSR1_EOF) {
430 /* end of frame. */
431 struct sk_buff *skb;
432
433 if (icsr0 & ICSR0_FRE) {
434 printk(KERN_ERR "pxa_ir: dropping erroneous frame\n");
435 dev->stats.rx_dropped++;
436 return;
437 }
438
439 skb = alloc_skb(len+1,GFP_ATOMIC);
440 if (!skb) {
441 printk(KERN_ERR "pxa_ir: fir out of memory for receive skb\n");
442 dev->stats.rx_dropped++;
443 return;
444 }
445
446 /* Align IP header to 20 bytes */
447 skb_reserve(skb, 1);
448 skb_copy_to_linear_data(skb, si->dma_rx_buff, len);
449 skb_put(skb, len);
450
451 /* Feed it to IrLAP */
452 skb->dev = dev;
453 skb_reset_mac_header(skb);
454 skb->protocol = htons(ETH_P_IRDA);
455 netif_rx(skb);
456
457 dev->stats.rx_packets++;
458 dev->stats.rx_bytes += len;
459 }
460 }
461
462 /* FIR interrupt handler */
463 static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
464 {
465 struct net_device *dev = dev_id;
466 struct pxa_irda *si = netdev_priv(dev);
467 int icsr0, i = 64;
468
469 /* stop RX DMA */
470 DCSR(si->rxdma) &= ~DCSR_RUN;
471 si->last_oscr = OSCR;
472 icsr0 = ICSR0;
473
474 if (icsr0 & (ICSR0_FRE | ICSR0_RAB)) {
475 if (icsr0 & ICSR0_FRE) {
476 printk(KERN_DEBUG "pxa_ir: fir receive frame error\n");
477 dev->stats.rx_frame_errors++;
478 } else {
479 printk(KERN_DEBUG "pxa_ir: fir receive abort\n");
480 dev->stats.rx_errors++;
481 }
482 ICSR0 = icsr0 & (ICSR0_FRE | ICSR0_RAB);
483 }
484
485 if (icsr0 & ICSR0_EIF) {
486 /* An error in FIFO occured, or there is a end of frame */
487 pxa_irda_fir_irq_eif(si, dev, icsr0);
488 }
489
490 ICCR0 = 0;
491 pxa_irda_fir_dma_rx_start(si);
492 while ((ICSR1 & ICSR1_RNE) && i--)
493 (void)ICDR;
494 ICCR0 = ICCR0_ITR | ICCR0_RXE;
495
496 if (i < 0)
497 printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
498
499 return IRQ_HANDLED;
500 }
501
502 /* hard_xmit interface of irda device */
503 static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
504 {
505 struct pxa_irda *si = netdev_priv(dev);
506 int speed = irda_get_next_speed(skb);
507
508 /*
509 * Does this packet contain a request to change the interface
510 * speed? If so, remember it until we complete the transmission
511 * of this frame.
512 */
513 if (speed != si->speed && speed != -1)
514 si->newspeed = speed;
515
516 /*
517 * If this is an empty frame, we can bypass a lot.
518 */
519 if (skb->len == 0) {
520 if (si->newspeed) {
521 si->newspeed = 0;
522 pxa_irda_set_speed(si, speed);
523 }
524 dev_kfree_skb(skb);
525 return NETDEV_TX_OK;
526 }
527
528 netif_stop_queue(dev);
529
530 if (!IS_FIR(si)) {
531 si->tx_buff.data = si->tx_buff.head;
532 si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data, si->tx_buff.truesize);
533
534 /* Disable STUART interrupts and switch to transmit mode. */
535 STIER = 0;
536 STISR = IrSR_IR_TRANSMIT_ON | IrSR_XMODE_PULSE_1_6;
537
538 /* enable STUART and transmit interrupts */
539 STIER = IER_UUE | IER_TIE;
540 } else {
541 unsigned long mtt = irda_get_mtt(skb);
542
543 si->dma_tx_buff_len = skb->len;
544 skb_copy_from_linear_data(skb, si->dma_tx_buff, skb->len);
545
546 if (mtt)
547 while ((unsigned)(OSCR - si->last_oscr)/4 < mtt)
548 cpu_relax();
549
550 /* stop RX DMA, disable FICP */
551 DCSR(si->rxdma) &= ~DCSR_RUN;
552 ICCR0 = 0;
553
554 pxa_irda_fir_dma_tx_start(si);
555 ICCR0 = ICCR0_ITR | ICCR0_TXE;
556 }
557
558 dev_kfree_skb(skb);
559 dev->trans_start = jiffies;
560 return NETDEV_TX_OK;
561 }
562
563 static int pxa_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
564 {
565 struct if_irda_req *rq = (struct if_irda_req *)ifreq;
566 struct pxa_irda *si = netdev_priv(dev);
567 int ret;
568
569 switch (cmd) {
570 case SIOCSBANDWIDTH:
571 ret = -EPERM;
572 if (capable(CAP_NET_ADMIN)) {
573 /*
574 * We are unable to set the speed if the
575 * device is not running.
576 */
577 if (netif_running(dev)) {
578 ret = pxa_irda_set_speed(si,
579 rq->ifr_baudrate);
580 } else {
581 printk(KERN_INFO "pxa_ir: SIOCSBANDWIDTH: !netif_running\n");
582 ret = 0;
583 }
584 }
585 break;
586
587 case SIOCSMEDIABUSY:
588 ret = -EPERM;
589 if (capable(CAP_NET_ADMIN)) {
590 irda_device_set_media_busy(dev, TRUE);
591 ret = 0;
592 }
593 break;
594
595 case SIOCGRECEIVING:
596 ret = 0;
597 rq->ifr_receiving = IS_FIR(si) ? 0
598 : si->rx_buff.state != OUTSIDE_FRAME;
599 break;
600
601 default:
602 ret = -EOPNOTSUPP;
603 break;
604 }
605
606 return ret;
607 }
608
609 static void pxa_irda_startup(struct pxa_irda *si)
610 {
611 /* Disable STUART interrupts */
612 STIER = 0;
613 /* enable STUART interrupt to the processor */
614 STMCR = MCR_OUT2;
615 /* configure SIR frame format: StartBit - Data 7 ... Data 0 - Stop Bit */
616 STLCR = LCR_WLS0 | LCR_WLS1;
617 /* enable FIFO, we use FIFO to improve performance */
618 STFCR = FCR_TRFIFOE | FCR_ITL_32;
619
620 /* disable FICP */
621 ICCR0 = 0;
622 /* configure FICP ICCR2 */
623 ICCR2 = ICCR2_TXP | ICCR2_TRIG_32;
624
625 /* configure DMAC */
626 DRCMR(17) = si->rxdma | DRCMR_MAPVLD;
627 DRCMR(18) = si->txdma | DRCMR_MAPVLD;
628
629 /* force SIR reinitialization */
630 si->speed = 4000000;
631 pxa_irda_set_speed(si, 9600);
632
633 printk(KERN_DEBUG "pxa_ir: irda startup\n");
634 }
635
636 static void pxa_irda_shutdown(struct pxa_irda *si)
637 {
638 unsigned long flags;
639
640 local_irq_save(flags);
641
642 /* disable STUART and interrupt */
643 STIER = 0;
644 /* disable STUART SIR mode */
645 STISR = 0;
646
647 /* disable DMA */
648 DCSR(si->txdma) &= ~DCSR_RUN;
649 DCSR(si->rxdma) &= ~DCSR_RUN;
650 /* disable FICP */
651 ICCR0 = 0;
652
653 /* disable the STUART or FICP clocks */
654 pxa_irda_disable_clk(si);
655
656 DRCMR(17) = 0;
657 DRCMR(18) = 0;
658
659 local_irq_restore(flags);
660
661 /* power off board transceiver */
662 pxa_irda_set_mode(si, IR_OFF);
663
664 printk(KERN_DEBUG "pxa_ir: irda shutdown\n");
665 }
666
667 static int pxa_irda_start(struct net_device *dev)
668 {
669 struct pxa_irda *si = netdev_priv(dev);
670 int err;
671
672 si->speed = 9600;
673
674 err = request_irq(IRQ_STUART, pxa_irda_sir_irq, 0, dev->name, dev);
675 if (err)
676 goto err_irq1;
677
678 err = request_irq(IRQ_ICP, pxa_irda_fir_irq, 0, dev->name, dev);
679 if (err)
680 goto err_irq2;
681
682 /*
683 * The interrupt must remain disabled for now.
684 */
685 disable_irq(IRQ_STUART);
686 disable_irq(IRQ_ICP);
687
688 err = -EBUSY;
689 si->rxdma = pxa_request_dma("FICP_RX",DMA_PRIO_LOW, pxa_irda_fir_dma_rx_irq, dev);
690 if (si->rxdma < 0)
691 goto err_rx_dma;
692
693 si->txdma = pxa_request_dma("FICP_TX",DMA_PRIO_LOW, pxa_irda_fir_dma_tx_irq, dev);
694 if (si->txdma < 0)
695 goto err_tx_dma;
696
697 err = -ENOMEM;
698 si->dma_rx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
699 &si->dma_rx_buff_phy, GFP_KERNEL );
700 if (!si->dma_rx_buff)
701 goto err_dma_rx_buff;
702
703 si->dma_tx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
704 &si->dma_tx_buff_phy, GFP_KERNEL );
705 if (!si->dma_tx_buff)
706 goto err_dma_tx_buff;
707
708 /* Setup the serial port for the initial speed. */
709 pxa_irda_startup(si);
710
711 /*
712 * Open a new IrLAP layer instance.
713 */
714 si->irlap = irlap_open(dev, &si->qos, "pxa");
715 err = -ENOMEM;
716 if (!si->irlap)
717 goto err_irlap;
718
719 /*
720 * Now enable the interrupt and start the queue
721 */
722 enable_irq(IRQ_STUART);
723 enable_irq(IRQ_ICP);
724 netif_start_queue(dev);
725
726 printk(KERN_DEBUG "pxa_ir: irda driver opened\n");
727
728 return 0;
729
730 err_irlap:
731 pxa_irda_shutdown(si);
732 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
733 err_dma_tx_buff:
734 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
735 err_dma_rx_buff:
736 pxa_free_dma(si->txdma);
737 err_tx_dma:
738 pxa_free_dma(si->rxdma);
739 err_rx_dma:
740 free_irq(IRQ_ICP, dev);
741 err_irq2:
742 free_irq(IRQ_STUART, dev);
743 err_irq1:
744
745 return err;
746 }
747
748 static int pxa_irda_stop(struct net_device *dev)
749 {
750 struct pxa_irda *si = netdev_priv(dev);
751
752 netif_stop_queue(dev);
753
754 pxa_irda_shutdown(si);
755
756 /* Stop IrLAP */
757 if (si->irlap) {
758 irlap_close(si->irlap);
759 si->irlap = NULL;
760 }
761
762 free_irq(IRQ_STUART, dev);
763 free_irq(IRQ_ICP, dev);
764
765 pxa_free_dma(si->rxdma);
766 pxa_free_dma(si->txdma);
767
768 if (si->dma_rx_buff)
769 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
770 if (si->dma_tx_buff)
771 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
772
773 printk(KERN_DEBUG "pxa_ir: irda driver closed\n");
774 return 0;
775 }
776
777 static int pxa_irda_suspend(struct platform_device *_dev, pm_message_t state)
778 {
779 struct net_device *dev = platform_get_drvdata(_dev);
780 struct pxa_irda *si;
781
782 if (dev && netif_running(dev)) {
783 si = netdev_priv(dev);
784 netif_device_detach(dev);
785 pxa_irda_shutdown(si);
786 }
787
788 return 0;
789 }
790
791 static int pxa_irda_resume(struct platform_device *_dev)
792 {
793 struct net_device *dev = platform_get_drvdata(_dev);
794 struct pxa_irda *si;
795
796 if (dev && netif_running(dev)) {
797 si = netdev_priv(dev);
798 pxa_irda_startup(si);
799 netif_device_attach(dev);
800 netif_wake_queue(dev);
801 }
802
803 return 0;
804 }
805
806
807 static int pxa_irda_init_iobuf(iobuff_t *io, int size)
808 {
809 io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
810 if (io->head != NULL) {
811 io->truesize = size;
812 io->in_frame = FALSE;
813 io->state = OUTSIDE_FRAME;
814 io->data = io->head;
815 }
816 return io->head ? 0 : -ENOMEM;
817 }
818
819 static const struct net_device_ops pxa_irda_netdev_ops = {
820 .ndo_open = pxa_irda_start,
821 .ndo_stop = pxa_irda_stop,
822 .ndo_start_xmit = pxa_irda_hard_xmit,
823 .ndo_do_ioctl = pxa_irda_ioctl,
824 };
825
826 static int pxa_irda_probe(struct platform_device *pdev)
827 {
828 struct net_device *dev;
829 struct pxa_irda *si;
830 unsigned int baudrate_mask;
831 int err;
832
833 if (!pdev->dev.platform_data)
834 return -ENODEV;
835
836 err = request_mem_region(__PREG(STUART), 0x24, "IrDA") ? 0 : -EBUSY;
837 if (err)
838 goto err_mem_1;
839
840 err = request_mem_region(__PREG(FICP), 0x1c, "IrDA") ? 0 : -EBUSY;
841 if (err)
842 goto err_mem_2;
843
844 dev = alloc_irdadev(sizeof(struct pxa_irda));
845 if (!dev)
846 goto err_mem_3;
847
848 SET_NETDEV_DEV(dev, &pdev->dev);
849 si = netdev_priv(dev);
850 si->dev = &pdev->dev;
851 si->pdata = pdev->dev.platform_data;
852
853 si->sir_clk = clk_get(&pdev->dev, "UARTCLK");
854 si->fir_clk = clk_get(&pdev->dev, "FICPCLK");
855 if (IS_ERR(si->sir_clk) || IS_ERR(si->fir_clk)) {
856 err = PTR_ERR(IS_ERR(si->sir_clk) ? si->sir_clk : si->fir_clk);
857 goto err_mem_4;
858 }
859
860 /*
861 * Initialise the SIR buffers
862 */
863 err = pxa_irda_init_iobuf(&si->rx_buff, 14384);
864 if (err)
865 goto err_mem_4;
866 err = pxa_irda_init_iobuf(&si->tx_buff, 4000);
867 if (err)
868 goto err_mem_5;
869
870 if (gpio_is_valid(si->pdata->gpio_pwdown)) {
871 err = gpio_request(si->pdata->gpio_pwdown, "IrDA switch");
872 if (err)
873 goto err_startup;
874 err = gpio_direction_output(si->pdata->gpio_pwdown,
875 !si->pdata->gpio_pwdown_inverted);
876 if (err) {
877 gpio_free(si->pdata->gpio_pwdown);
878 goto err_startup;
879 }
880 }
881
882 if (si->pdata->startup) {
883 err = si->pdata->startup(si->dev);
884 if (err)
885 goto err_startup;
886 }
887
888 if (gpio_is_valid(si->pdata->gpio_pwdown) && si->pdata->startup)
889 dev_warn(si->dev, "gpio_pwdown and startup() both defined!\n");
890
891 dev->netdev_ops = &pxa_irda_netdev_ops;
892
893 irda_init_max_qos_capabilies(&si->qos);
894
895 baudrate_mask = 0;
896 if (si->pdata->transceiver_cap & IR_SIRMODE)
897 baudrate_mask |= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
898 if (si->pdata->transceiver_cap & IR_FIRMODE)
899 baudrate_mask |= IR_4000000 << 8;
900
901 si->qos.baud_rate.bits &= baudrate_mask;
902 si->qos.min_turn_time.bits = 7; /* 1ms or more */
903
904 irda_qos_bits_to_value(&si->qos);
905
906 err = register_netdev(dev);
907
908 if (err == 0)
909 dev_set_drvdata(&pdev->dev, dev);
910
911 if (err) {
912 if (si->pdata->shutdown)
913 si->pdata->shutdown(si->dev);
914 err_startup:
915 kfree(si->tx_buff.head);
916 err_mem_5:
917 kfree(si->rx_buff.head);
918 err_mem_4:
919 if (si->sir_clk && !IS_ERR(si->sir_clk))
920 clk_put(si->sir_clk);
921 if (si->fir_clk && !IS_ERR(si->fir_clk))
922 clk_put(si->fir_clk);
923 free_netdev(dev);
924 err_mem_3:
925 release_mem_region(__PREG(FICP), 0x1c);
926 err_mem_2:
927 release_mem_region(__PREG(STUART), 0x24);
928 }
929 err_mem_1:
930 return err;
931 }
932
933 static int pxa_irda_remove(struct platform_device *_dev)
934 {
935 struct net_device *dev = platform_get_drvdata(_dev);
936
937 if (dev) {
938 struct pxa_irda *si = netdev_priv(dev);
939 unregister_netdev(dev);
940 if (gpio_is_valid(si->pdata->gpio_pwdown))
941 gpio_free(si->pdata->gpio_pwdown);
942 if (si->pdata->shutdown)
943 si->pdata->shutdown(si->dev);
944 kfree(si->tx_buff.head);
945 kfree(si->rx_buff.head);
946 clk_put(si->fir_clk);
947 clk_put(si->sir_clk);
948 free_netdev(dev);
949 }
950
951 release_mem_region(__PREG(STUART), 0x24);
952 release_mem_region(__PREG(FICP), 0x1c);
953
954 return 0;
955 }
956
957 static struct platform_driver pxa_ir_driver = {
958 .driver = {
959 .name = "pxa2xx-ir",
960 .owner = THIS_MODULE,
961 },
962 .probe = pxa_irda_probe,
963 .remove = pxa_irda_remove,
964 .suspend = pxa_irda_suspend,
965 .resume = pxa_irda_resume,
966 };
967
968 static int __init pxa_irda_init(void)
969 {
970 return platform_driver_register(&pxa_ir_driver);
971 }
972
973 static void __exit pxa_irda_exit(void)
974 {
975 platform_driver_unregister(&pxa_ir_driver);
976 }
977
978 module_init(pxa_irda_init);
979 module_exit(pxa_irda_exit);
980
981 MODULE_LICENSE("GPL");
982 MODULE_ALIAS("platform:pxa2xx-ir");
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