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btrfs: fix btrfs_mkdir goto for no free objectids
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / irda / pxaficp_ir.c
blob84db145d2b59ad3ed3ef02ce8d621c7bf9eedea9
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
22 #include <net/irda/irda.h>
23 #include <net/irda/irmod.h>
24 #include <net/irda/wrapper.h>
25 #include <net/irda/irda_device.h>
26
27 #include <mach/dma.h>
28 #include <mach/irda.h>
29 #include <mach/regs-uart.h>
30 #include <mach/regs-ost.h>
31
32 #define FICP __REG(0x40800000) /* Start of FICP area */
33 #define ICCR0 __REG(0x40800000) /* ICP Control Register 0 */
34 #define ICCR1 __REG(0x40800004) /* ICP Control Register 1 */
35 #define ICCR2 __REG(0x40800008) /* ICP Control Register 2 */
36 #define ICDR __REG(0x4080000c) /* ICP Data Register */
37 #define ICSR0 __REG(0x40800014) /* ICP Status Register 0 */
38 #define ICSR1 __REG(0x40800018) /* ICP Status Register 1 */
39
40 #define ICCR0_AME (1 << 7) /* Address match enable */
41 #define ICCR0_TIE (1 << 6) /* Transmit FIFO interrupt enable */
42 #define ICCR0_RIE (1 << 5) /* Recieve FIFO interrupt enable */
43 #define ICCR0_RXE (1 << 4) /* Receive enable */
44 #define ICCR0_TXE (1 << 3) /* Transmit enable */
45 #define ICCR0_TUS (1 << 2) /* Transmit FIFO underrun select */
46 #define ICCR0_LBM (1 << 1) /* Loopback mode */
47 #define ICCR0_ITR (1 << 0) /* IrDA transmission */
48
49 #define ICCR2_RXP (1 << 3) /* Receive Pin Polarity select */
50 #define ICCR2_TXP (1 << 2) /* Transmit Pin Polarity select */
51 #define ICCR2_TRIG (3 << 0) /* Receive FIFO Trigger threshold */
52 #define ICCR2_TRIG_8 (0 << 0) /* >= 8 bytes */
53 #define ICCR2_TRIG_16 (1 << 0) /* >= 16 bytes */
54 #define ICCR2_TRIG_32 (2 << 0) /* >= 32 bytes */
55
56 #ifdef CONFIG_PXA27x
57 #define ICSR0_EOC (1 << 6) /* DMA End of Descriptor Chain */
58 #endif
59 #define ICSR0_FRE (1 << 5) /* Framing error */
60 #define ICSR0_RFS (1 << 4) /* Receive FIFO service request */
61 #define ICSR0_TFS (1 << 3) /* Transnit FIFO service request */
62 #define ICSR0_RAB (1 << 2) /* Receiver abort */
63 #define ICSR0_TUR (1 << 1) /* Trunsmit FIFO underun */
64 #define ICSR0_EIF (1 << 0) /* End/Error in FIFO */
65
66 #define ICSR1_ROR (1 << 6) /* Receiver FIFO underrun */
67 #define ICSR1_CRE (1 << 5) /* CRC error */
68 #define ICSR1_EOF (1 << 4) /* End of frame */
69 #define ICSR1_TNF (1 << 3) /* Transmit FIFO not full */
70 #define ICSR1_RNE (1 << 2) /* Receive FIFO not empty */
71 #define ICSR1_TBY (1 << 1) /* Tramsmiter busy flag */
72 #define ICSR1_RSY (1 << 0) /* Recevier synchronized flag */
73
74 #define IrSR_RXPL_NEG_IS_ZERO (1<<4)
75 #define IrSR_RXPL_POS_IS_ZERO 0x0
76 #define IrSR_TXPL_NEG_IS_ZERO (1<<3)
77 #define IrSR_TXPL_POS_IS_ZERO 0x0
78 #define IrSR_XMODE_PULSE_1_6 (1<<2)
79 #define IrSR_XMODE_PULSE_3_16 0x0
80 #define IrSR_RCVEIR_IR_MODE (1<<1)
81 #define IrSR_RCVEIR_UART_MODE 0x0
82 #define IrSR_XMITIR_IR_MODE (1<<0)
83 #define IrSR_XMITIR_UART_MODE 0x0
84
85 #define IrSR_IR_RECEIVE_ON (\
86 IrSR_RXPL_NEG_IS_ZERO | \
87 IrSR_TXPL_POS_IS_ZERO | \
88 IrSR_XMODE_PULSE_3_16 | \
89 IrSR_RCVEIR_IR_MODE | \
90 IrSR_XMITIR_UART_MODE)
91
92 #define IrSR_IR_TRANSMIT_ON (\
93 IrSR_RXPL_NEG_IS_ZERO | \
94 IrSR_TXPL_POS_IS_ZERO | \
95 IrSR_XMODE_PULSE_3_16 | \
96 IrSR_RCVEIR_UART_MODE | \
97 IrSR_XMITIR_IR_MODE)
98
99 struct pxa_irda {
100 int speed;
101 int newspeed;
102 unsigned long last_oscr;
103
104 unsigned char *dma_rx_buff;
105 unsigned char *dma_tx_buff;
106 dma_addr_t dma_rx_buff_phy;
107 dma_addr_t dma_tx_buff_phy;
108 unsigned int dma_tx_buff_len;
109 int txdma;
110 int rxdma;
111
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 mode.
168 */
169 static void pxa_irda_set_mode(struct pxa_irda *si, int mode)
170 {
171 if (si->pdata->transceiver_mode)
172 si->pdata->transceiver_mode(si->dev, mode);
173 else {
174 if (gpio_is_valid(si->pdata->gpio_pwdown))
175 gpio_set_value(si->pdata->gpio_pwdown,
176 !(mode & IR_OFF) ^
177 !si->pdata->gpio_pwdown_inverted);
178 pxa2xx_transceiver_mode(si->dev, mode);
179 }
180 }
181
182 /*
183 * Set the IrDA communications speed.
184 */
185 static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
186 {
187 unsigned long flags;
188 unsigned int divisor;
189
190 switch (speed) {
191 case 9600: case 19200: case 38400:
192 case 57600: case 115200:
193
194 /* refer to PXA250/210 Developer's Manual 10-7 */
195 /* BaudRate = 14.7456 MHz / (16*Divisor) */
196 divisor = 14745600 / (16 * speed);
197
198 local_irq_save(flags);
199
200 if (IS_FIR(si)) {
201 /* stop RX DMA */
202 DCSR(si->rxdma) &= ~DCSR_RUN;
203 /* disable FICP */
204 ICCR0 = 0;
205 pxa_irda_disable_clk(si);
206
207 /* set board transceiver to SIR mode */
208 pxa_irda_set_mode(si, IR_SIRMODE);
209
210 /* enable the STUART clock */
211 pxa_irda_enable_sirclk(si);
212 }
213
214 /* disable STUART first */
215 STIER = 0;
216
217 /* access DLL & DLH */
218 STLCR |= LCR_DLAB;
219 STDLL = divisor & 0xff;
220 STDLH = divisor >> 8;
221 STLCR &= ~LCR_DLAB;
222
223 si->speed = speed;
224 STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
225 STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
226
227 local_irq_restore(flags);
228 break;
229
230 case 4000000:
231 local_irq_save(flags);
232
233 /* disable STUART */
234 STIER = 0;
235 STISR = 0;
236 pxa_irda_disable_clk(si);
237
238 /* disable FICP first */
239 ICCR0 = 0;
240
241 /* set board transceiver to FIR mode */
242 pxa_irda_set_mode(si, IR_FIRMODE);
243
244 /* enable the FICP clock */
245 pxa_irda_enable_firclk(si);
246
247 si->speed = speed;
248 pxa_irda_fir_dma_rx_start(si);
249 ICCR0 = ICCR0_ITR | ICCR0_RXE;
250
251 local_irq_restore(flags);
252 break;
253
254 default:
255 return -EINVAL;
256 }
257
258 return 0;
259 }
260
261 /* SIR interrupt service routine. */
262 static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
263 {
264 struct net_device *dev = dev_id;
265 struct pxa_irda *si = netdev_priv(dev);
266 int iir, lsr, data;
267
268 iir = STIIR;
269
270 switch (iir & 0x0F) {
271 case 0x06: /* Receiver Line Status */
272 lsr = STLSR;
273 while (lsr & LSR_FIFOE) {
274 data = STRBR;
275 if (lsr & (LSR_OE | LSR_PE | LSR_FE | LSR_BI)) {
276 printk(KERN_DEBUG "pxa_ir: sir receiving error\n");
277 dev->stats.rx_errors++;
278 if (lsr & LSR_FE)
279 dev->stats.rx_frame_errors++;
280 if (lsr & LSR_OE)
281 dev->stats.rx_fifo_errors++;
282 } else {
283 dev->stats.rx_bytes++;
284 async_unwrap_char(dev, &dev->stats,
285 &si->rx_buff, data);
286 }
287 lsr = STLSR;
288 }
289 si->last_oscr = OSCR;
290 break;
291
292 case 0x04: /* Received Data Available */
293 /* forth through */
294
295 case 0x0C: /* Character Timeout Indication */
296 do {
297 dev->stats.rx_bytes++;
298 async_unwrap_char(dev, &dev->stats, &si->rx_buff, STRBR);
299 } while (STLSR & LSR_DR);
300 si->last_oscr = OSCR;
301 break;
302
303 case 0x02: /* Transmit FIFO Data Request */
304 while ((si->tx_buff.len) && (STLSR & LSR_TDRQ)) {
305 STTHR = *si->tx_buff.data++;
306 si->tx_buff.len -= 1;
307 }
308
309 if (si->tx_buff.len == 0) {
310 dev->stats.tx_packets++;
311 dev->stats.tx_bytes += si->tx_buff.data - si->tx_buff.head;
312
313 /* We need to ensure that the transmitter has finished. */
314 while ((STLSR & LSR_TEMT) == 0)
315 cpu_relax();
316 si->last_oscr = OSCR;
317
318 /*
319 * Ok, we've finished transmitting. Now enable
320 * the receiver. Sometimes we get a receive IRQ
321 * immediately after a transmit...
322 */
323 if (si->newspeed) {
324 pxa_irda_set_speed(si, si->newspeed);
325 si->newspeed = 0;
326 } else {
327 /* enable IR Receiver, disable IR Transmitter */
328 STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
329 /* enable STUART and receive interrupts */
330 STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
331 }
332 /* I'm hungry! */
333 netif_wake_queue(dev);
334 }
335 break;
336 }
337
338 return IRQ_HANDLED;
339 }
340
341 /* FIR Receive DMA interrupt handler */
342 static void pxa_irda_fir_dma_rx_irq(int channel, void *data)
343 {
344 int dcsr = DCSR(channel);
345
346 DCSR(channel) = dcsr & ~DCSR_RUN;
347
348 printk(KERN_DEBUG "pxa_ir: fir rx dma bus error %#x\n", dcsr);
349 }
350
351 /* FIR Transmit DMA interrupt handler */
352 static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
353 {
354 struct net_device *dev = data;
355 struct pxa_irda *si = netdev_priv(dev);
356 int dcsr;
357
358 dcsr = DCSR(channel);
359 DCSR(channel) = dcsr & ~DCSR_RUN;
360
361 if (dcsr & DCSR_ENDINTR) {
362 dev->stats.tx_packets++;
363 dev->stats.tx_bytes += si->dma_tx_buff_len;
364 } else {
365 dev->stats.tx_errors++;
366 }
367
368 while (ICSR1 & ICSR1_TBY)
369 cpu_relax();
370 si->last_oscr = OSCR;
371
372 /*
373 * HACK: It looks like the TBY bit is dropped too soon.
374 * Without this delay things break.
375 */
376 udelay(120);
377
378 if (si->newspeed) {
379 pxa_irda_set_speed(si, si->newspeed);
380 si->newspeed = 0;
381 } else {
382 int i = 64;
383
384 ICCR0 = 0;
385 pxa_irda_fir_dma_rx_start(si);
386 while ((ICSR1 & ICSR1_RNE) && i--)
387 (void)ICDR;
388 ICCR0 = ICCR0_ITR | ICCR0_RXE;
389
390 if (i < 0)
391 printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
392 }
393 netif_wake_queue(dev);
394 }
395
396 /* EIF(Error in FIFO/End in Frame) handler for FIR */
397 static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev, int icsr0)
398 {
399 unsigned int len, stat, data;
400
401 /* Get the current data position. */
402 len = DTADR(si->rxdma) - si->dma_rx_buff_phy;
403
404 do {
405 /* Read Status, and then Data. */
406 stat = ICSR1;
407 rmb();
408 data = ICDR;
409
410 if (stat & (ICSR1_CRE | ICSR1_ROR)) {
411 dev->stats.rx_errors++;
412 if (stat & ICSR1_CRE) {
413 printk(KERN_DEBUG "pxa_ir: fir receive CRC error\n");
414 dev->stats.rx_crc_errors++;
415 }
416 if (stat & ICSR1_ROR) {
417 printk(KERN_DEBUG "pxa_ir: fir receive overrun\n");
418 dev->stats.rx_over_errors++;
419 }
420 } else {
421 si->dma_rx_buff[len++] = data;
422 }
423 /* If we hit the end of frame, there's no point in continuing. */
424 if (stat & ICSR1_EOF)
425 break;
426 } while (ICSR0 & ICSR0_EIF);
427
428 if (stat & ICSR1_EOF) {
429 /* end of frame. */
430 struct sk_buff *skb;
431
432 if (icsr0 & ICSR0_FRE) {
433 printk(KERN_ERR "pxa_ir: dropping erroneous frame\n");
434 dev->stats.rx_dropped++;
435 return;
436 }
437
438 skb = alloc_skb(len+1,GFP_ATOMIC);
439 if (!skb) {
440 printk(KERN_ERR "pxa_ir: fir out of memory for receive skb\n");
441 dev->stats.rx_dropped++;
442 return;
443 }
444
445 /* Align IP header to 20 bytes */
446 skb_reserve(skb, 1);
447 skb_copy_to_linear_data(skb, si->dma_rx_buff, len);
448 skb_put(skb, len);
449
450 /* Feed it to IrLAP */
451 skb->dev = dev;
452 skb_reset_mac_header(skb);
453 skb->protocol = htons(ETH_P_IRDA);
454 netif_rx(skb);
455
456 dev->stats.rx_packets++;
457 dev->stats.rx_bytes += len;
458 }
459 }
460
461 /* FIR interrupt handler */
462 static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
463 {
464 struct net_device *dev = dev_id;
465 struct pxa_irda *si = netdev_priv(dev);
466 int icsr0, i = 64;
467
468 /* stop RX DMA */
469 DCSR(si->rxdma) &= ~DCSR_RUN;
470 si->last_oscr = OSCR;
471 icsr0 = ICSR0;
472
473 if (icsr0 & (ICSR0_FRE | ICSR0_RAB)) {
474 if (icsr0 & ICSR0_FRE) {
475 printk(KERN_DEBUG "pxa_ir: fir receive frame error\n");
476 dev->stats.rx_frame_errors++;
477 } else {
478 printk(KERN_DEBUG "pxa_ir: fir receive abort\n");
479 dev->stats.rx_errors++;
480 }
481 ICSR0 = icsr0 & (ICSR0_FRE | ICSR0_RAB);
482 }
483
484 if (icsr0 & ICSR0_EIF) {
485 /* An error in FIFO occured, or there is a end of frame */
486 pxa_irda_fir_irq_eif(si, dev, icsr0);
487 }
488
489 ICCR0 = 0;
490 pxa_irda_fir_dma_rx_start(si);
491 while ((ICSR1 & ICSR1_RNE) && i--)
492 (void)ICDR;
493 ICCR0 = ICCR0_ITR | ICCR0_RXE;
494
495 if (i < 0)
496 printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
497
498 return IRQ_HANDLED;
499 }
500
501 /* hard_xmit interface of irda device */
502 static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
503 {
504 struct pxa_irda *si = netdev_priv(dev);
505 int speed = irda_get_next_speed(skb);
506
507 /*
508 * Does this packet contain a request to change the interface
509 * speed? If so, remember it until we complete the transmission
510 * of this frame.
511 */
512 if (speed != si->speed && speed != -1)
513 si->newspeed = speed;
514
515 /*
516 * If this is an empty frame, we can bypass a lot.
517 */
518 if (skb->len == 0) {
519 if (si->newspeed) {
520 si->newspeed = 0;
521 pxa_irda_set_speed(si, speed);
522 }
523 dev_kfree_skb(skb);
524 return NETDEV_TX_OK;
525 }
526
527 netif_stop_queue(dev);
528
529 if (!IS_FIR(si)) {
530 si->tx_buff.data = si->tx_buff.head;
531 si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data, si->tx_buff.truesize);
532
533 /* Disable STUART interrupts and switch to transmit mode. */
534 STIER = 0;
535 STISR = IrSR_IR_TRANSMIT_ON | IrSR_XMODE_PULSE_1_6;
536
537 /* enable STUART and transmit interrupts */
538 STIER = IER_UUE | IER_TIE;
539 } else {
540 unsigned long mtt = irda_get_mtt(skb);
541
542 si->dma_tx_buff_len = skb->len;
543 skb_copy_from_linear_data(skb, si->dma_tx_buff, skb->len);
544
545 if (mtt)
546 while ((unsigned)(OSCR - si->last_oscr)/4 < mtt)
547 cpu_relax();
548
549 /* stop RX DMA, disable FICP */
550 DCSR(si->rxdma) &= ~DCSR_RUN;
551 ICCR0 = 0;
552
553 pxa_irda_fir_dma_tx_start(si);
554 ICCR0 = ICCR0_ITR | ICCR0_TXE;
555 }
556
557 dev_kfree_skb(skb);
558 dev->trans_start = jiffies;
559 return NETDEV_TX_OK;
560 }
561
562 static int pxa_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
563 {
564 struct if_irda_req *rq = (struct if_irda_req *)ifreq;
565 struct pxa_irda *si = netdev_priv(dev);
566 int ret;
567
568 switch (cmd) {
569 case SIOCSBANDWIDTH:
570 ret = -EPERM;
571 if (capable(CAP_NET_ADMIN)) {
572 /*
573 * We are unable to set the speed if the
574 * device is not running.
575 */
576 if (netif_running(dev)) {
577 ret = pxa_irda_set_speed(si,
578 rq->ifr_baudrate);
579 } else {
580 printk(KERN_INFO "pxa_ir: SIOCSBANDWIDTH: !netif_running\n");
581 ret = 0;
582 }
583 }
584 break;
585
586 case SIOCSMEDIABUSY:
587 ret = -EPERM;
588 if (capable(CAP_NET_ADMIN)) {
589 irda_device_set_media_busy(dev, TRUE);
590 ret = 0;
591 }
592 break;
593
594 case SIOCGRECEIVING:
595 ret = 0;
596 rq->ifr_receiving = IS_FIR(si) ? 0
597 : si->rx_buff.state != OUTSIDE_FRAME;
598 break;
599
600 default:
601 ret = -EOPNOTSUPP;
602 break;
603 }
604
605 return ret;
606 }
607
608 static void pxa_irda_startup(struct pxa_irda *si)
609 {
610 /* Disable STUART interrupts */
611 STIER = 0;
612 /* enable STUART interrupt to the processor */
613 STMCR = MCR_OUT2;
614 /* configure SIR frame format: StartBit - Data 7 ... Data 0 - Stop Bit */
615 STLCR = LCR_WLS0 | LCR_WLS1;
616 /* enable FIFO, we use FIFO to improve performance */
617 STFCR = FCR_TRFIFOE | FCR_ITL_32;
618
619 /* disable FICP */
620 ICCR0 = 0;
621 /* configure FICP ICCR2 */
622 ICCR2 = ICCR2_TXP | ICCR2_TRIG_32;
623
624 /* configure DMAC */
625 DRCMR(17) = si->rxdma | DRCMR_MAPVLD;
626 DRCMR(18) = si->txdma | DRCMR_MAPVLD;
627
628 /* force SIR reinitialization */
629 si->speed = 4000000;
630 pxa_irda_set_speed(si, 9600);
631
632 printk(KERN_DEBUG "pxa_ir: irda startup\n");
633 }
634
635 static void pxa_irda_shutdown(struct pxa_irda *si)
636 {
637 unsigned long flags;
638
639 local_irq_save(flags);
640
641 /* disable STUART and interrupt */
642 STIER = 0;
643 /* disable STUART SIR mode */
644 STISR = 0;
645
646 /* disable DMA */
647 DCSR(si->txdma) &= ~DCSR_RUN;
648 DCSR(si->rxdma) &= ~DCSR_RUN;
649 /* disable FICP */
650 ICCR0 = 0;
651
652 /* disable the STUART or FICP clocks */
653 pxa_irda_disable_clk(si);
654
655 DRCMR(17) = 0;
656 DRCMR(18) = 0;
657
658 local_irq_restore(flags);
659
660 /* power off board transceiver */
661 pxa_irda_set_mode(si, IR_OFF);
662
663 printk(KERN_DEBUG "pxa_ir: irda shutdown\n");
664 }
665
666 static int pxa_irda_start(struct net_device *dev)
667 {
668 struct pxa_irda *si = netdev_priv(dev);
669 int err;
670
671 si->speed = 9600;
672
673 err = request_irq(IRQ_STUART, pxa_irda_sir_irq, 0, dev->name, dev);
674 if (err)
675 goto err_irq1;
676
677 err = request_irq(IRQ_ICP, pxa_irda_fir_irq, 0, dev->name, dev);
678 if (err)
679 goto err_irq2;
680
681 /*
682 * The interrupt must remain disabled for now.
683 */
684 disable_irq(IRQ_STUART);
685 disable_irq(IRQ_ICP);
686
687 err = -EBUSY;
688 si->rxdma = pxa_request_dma("FICP_RX",DMA_PRIO_LOW, pxa_irda_fir_dma_rx_irq, dev);
689 if (si->rxdma < 0)
690 goto err_rx_dma;
691
692 si->txdma = pxa_request_dma("FICP_TX",DMA_PRIO_LOW, pxa_irda_fir_dma_tx_irq, dev);
693 if (si->txdma < 0)
694 goto err_tx_dma;
695
696 err = -ENOMEM;
697 si->dma_rx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
698 &si->dma_rx_buff_phy, GFP_KERNEL );
699 if (!si->dma_rx_buff)
700 goto err_dma_rx_buff;
701
702 si->dma_tx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
703 &si->dma_tx_buff_phy, GFP_KERNEL );
704 if (!si->dma_tx_buff)
705 goto err_dma_tx_buff;
706
707 /* Setup the serial port for the initial speed. */
708 pxa_irda_startup(si);
709
710 /*
711 * Open a new IrLAP layer instance.
712 */
713 si->irlap = irlap_open(dev, &si->qos, "pxa");
714 err = -ENOMEM;
715 if (!si->irlap)
716 goto err_irlap;
717
718 /*
719 * Now enable the interrupt and start the queue
720 */
721 enable_irq(IRQ_STUART);
722 enable_irq(IRQ_ICP);
723 netif_start_queue(dev);
724
725 printk(KERN_DEBUG "pxa_ir: irda driver opened\n");
726
727 return 0;
728
729 err_irlap:
730 pxa_irda_shutdown(si);
731 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
732 err_dma_tx_buff:
733 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
734 err_dma_rx_buff:
735 pxa_free_dma(si->txdma);
736 err_tx_dma:
737 pxa_free_dma(si->rxdma);
738 err_rx_dma:
739 free_irq(IRQ_ICP, dev);
740 err_irq2:
741 free_irq(IRQ_STUART, dev);
742 err_irq1:
743
744 return err;
745 }
746
747 static int pxa_irda_stop(struct net_device *dev)
748 {
749 struct pxa_irda *si = netdev_priv(dev);
750
751 netif_stop_queue(dev);
752
753 pxa_irda_shutdown(si);
754
755 /* Stop IrLAP */
756 if (si->irlap) {
757 irlap_close(si->irlap);
758 si->irlap = NULL;
759 }
760
761 free_irq(IRQ_STUART, dev);
762 free_irq(IRQ_ICP, dev);
763
764 pxa_free_dma(si->rxdma);
765 pxa_free_dma(si->txdma);
766
767 if (si->dma_rx_buff)
768 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
769 if (si->dma_tx_buff)
770 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
771
772 printk(KERN_DEBUG "pxa_ir: irda driver closed\n");
773 return 0;
774 }
775
776 static int pxa_irda_suspend(struct platform_device *_dev, pm_message_t state)
777 {
778 struct net_device *dev = platform_get_drvdata(_dev);
779 struct pxa_irda *si;
780
781 if (dev && netif_running(dev)) {
782 si = netdev_priv(dev);
783 netif_device_detach(dev);
784 pxa_irda_shutdown(si);
785 }
786
787 return 0;
788 }
789
790 static int pxa_irda_resume(struct platform_device *_dev)
791 {
792 struct net_device *dev = platform_get_drvdata(_dev);
793 struct pxa_irda *si;
794
795 if (dev && netif_running(dev)) {
796 si = netdev_priv(dev);
797 pxa_irda_startup(si);
798 netif_device_attach(dev);
799 netif_wake_queue(dev);
800 }
801
802 return 0;
803 }
804
805
806 static int pxa_irda_init_iobuf(iobuff_t *io, int size)
807 {
808 io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
809 if (io->head != NULL) {
810 io->truesize = size;
811 io->in_frame = FALSE;
812 io->state = OUTSIDE_FRAME;
813 io->data = io->head;
814 }
815 return io->head ? 0 : -ENOMEM;
816 }
817
818 static const struct net_device_ops pxa_irda_netdev_ops = {
819 .ndo_open = pxa_irda_start,
820 .ndo_stop = pxa_irda_stop,
821 .ndo_start_xmit = pxa_irda_hard_xmit,
822 .ndo_do_ioctl = pxa_irda_ioctl,
823 };
824
825 static int pxa_irda_probe(struct platform_device *pdev)
826 {
827 struct net_device *dev;
828 struct pxa_irda *si;
829 unsigned int baudrate_mask;
830 int err;
831
832 if (!pdev->dev.platform_data)
833 return -ENODEV;
834
835 err = request_mem_region(__PREG(STUART), 0x24, "IrDA") ? 0 : -EBUSY;
836 if (err)
837 goto err_mem_1;
838
839 err = request_mem_region(__PREG(FICP), 0x1c, "IrDA") ? 0 : -EBUSY;
840 if (err)
841 goto err_mem_2;
842
843 dev = alloc_irdadev(sizeof(struct pxa_irda));
844 if (!dev)
845 goto err_mem_3;
846
847 SET_NETDEV_DEV(dev, &pdev->dev);
848 si = netdev_priv(dev);
849 si->dev = &pdev->dev;
850 si->pdata = pdev->dev.platform_data;
851
852 si->sir_clk = clk_get(&pdev->dev, "UARTCLK");
853 si->fir_clk = clk_get(&pdev->dev, "FICPCLK");
854 if (IS_ERR(si->sir_clk) || IS_ERR(si->fir_clk)) {
855 err = PTR_ERR(IS_ERR(si->sir_clk) ? si->sir_clk : si->fir_clk);
856 goto err_mem_4;
857 }
858
859 /*
860 * Initialise the SIR buffers
861 */
862 err = pxa_irda_init_iobuf(&si->rx_buff, 14384);
863 if (err)
864 goto err_mem_4;
865 err = pxa_irda_init_iobuf(&si->tx_buff, 4000);
866 if (err)
867 goto err_mem_5;
868
869 if (gpio_is_valid(si->pdata->gpio_pwdown)) {
870 err = gpio_request(si->pdata->gpio_pwdown, "IrDA switch");
871 if (err)
872 goto err_startup;
873 err = gpio_direction_output(si->pdata->gpio_pwdown,
874 !si->pdata->gpio_pwdown_inverted);
875 if (err) {
876 gpio_free(si->pdata->gpio_pwdown);
877 goto err_startup;
878 }
879 }
880
881 if (si->pdata->startup) {
882 err = si->pdata->startup(si->dev);
883 if (err)
884 goto err_startup;
885 }
886
887 if (gpio_is_valid(si->pdata->gpio_pwdown) && si->pdata->startup)
888 dev_warn(si->dev, "gpio_pwdown and startup() both defined!\n");
889
890 dev->netdev_ops = &pxa_irda_netdev_ops;
891
892 irda_init_max_qos_capabilies(&si->qos);
893
894 baudrate_mask = 0;
895 if (si->pdata->transceiver_cap & IR_SIRMODE)
896 baudrate_mask |= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
897 if (si->pdata->transceiver_cap & IR_FIRMODE)
898 baudrate_mask |= IR_4000000 << 8;
899
900 si->qos.baud_rate.bits &= baudrate_mask;
901 si->qos.min_turn_time.bits = 7; /* 1ms or more */
902
903 irda_qos_bits_to_value(&si->qos);
904
905 err = register_netdev(dev);
906
907 if (err == 0)
908 dev_set_drvdata(&pdev->dev, dev);
909
910 if (err) {
911 if (si->pdata->shutdown)
912 si->pdata->shutdown(si->dev);
913 err_startup:
914 kfree(si->tx_buff.head);
915 err_mem_5:
916 kfree(si->rx_buff.head);
917 err_mem_4:
918 if (si->sir_clk && !IS_ERR(si->sir_clk))
919 clk_put(si->sir_clk);
920 if (si->fir_clk && !IS_ERR(si->fir_clk))
921 clk_put(si->fir_clk);
922 free_netdev(dev);
923 err_mem_3:
924 release_mem_region(__PREG(FICP), 0x1c);
925 err_mem_2:
926 release_mem_region(__PREG(STUART), 0x24);
927 }
928 err_mem_1:
929 return err;
930 }
931
932 static int pxa_irda_remove(struct platform_device *_dev)
933 {
934 struct net_device *dev = platform_get_drvdata(_dev);
935
936 if (dev) {
937 struct pxa_irda *si = netdev_priv(dev);
938 unregister_netdev(dev);
939 if (gpio_is_valid(si->pdata->gpio_pwdown))
940 gpio_free(si->pdata->gpio_pwdown);
941 if (si->pdata->shutdown)
942 si->pdata->shutdown(si->dev);
943 kfree(si->tx_buff.head);
944 kfree(si->rx_buff.head);
945 clk_put(si->fir_clk);
946 clk_put(si->sir_clk);
947 free_netdev(dev);
948 }
949
950 release_mem_region(__PREG(STUART), 0x24);
951 release_mem_region(__PREG(FICP), 0x1c);
952
953 return 0;
954 }
955
956 static struct platform_driver pxa_ir_driver = {
957 .driver = {
958 .name = "pxa2xx-ir",
959 .owner = THIS_MODULE,
960 },
961 .probe = pxa_irda_probe,
962 .remove = pxa_irda_remove,
963 .suspend = pxa_irda_suspend,
964 .resume = pxa_irda_resume,
965 };
966
967 static int __init pxa_irda_init(void)
968 {
969 return platform_driver_register(&pxa_ir_driver);
970 }
971
972 static void __exit pxa_irda_exit(void)
973 {
974 platform_driver_unregister(&pxa_ir_driver);
975 }
976
977 module_init(pxa_irda_init);
978 module_exit(pxa_irda_exit);
979
980 MODULE_LICENSE("GPL");
981 MODULE_ALIAS("platform:pxa2xx-ir");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree