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