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Merge tag 'please-pull-misc-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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/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/dmaengine.h>
23 #include <linux/dma-mapping.h>
24 #include <linux/dma/pxa-dma.h>
25 #include <linux/gpio.h>
26 #include <linux/slab.h>
27
28 #include <net/irda/irda.h>
29 #include <net/irda/irmod.h>
30 #include <net/irda/wrapper.h>
31 #include <net/irda/irda_device.h>
32
33 #include <linux/platform_data/irda-pxaficp.h>
34 #undef __REG
35 #define __REG(x) ((x) & 0xffff)
36 #include <mach/regs-uart.h>
37
38 #define ICCR0 0x0000 /* ICP Control Register 0 */
39 #define ICCR1 0x0004 /* ICP Control Register 1 */
40 #define ICCR2 0x0008 /* ICP Control Register 2 */
41 #define ICDR 0x000c /* ICP Data Register */
42 #define ICSR0 0x0014 /* ICP Status Register 0 */
43 #define ICSR1 0x0018 /* ICP Status Register 1 */
44
45 #define ICCR0_AME (1 << 7) /* Address match enable */
46 #define ICCR0_TIE (1 << 6) /* Transmit FIFO interrupt enable */
47 #define ICCR0_RIE (1 << 5) /* Receive FIFO interrupt enable */
48 #define ICCR0_RXE (1 << 4) /* Receive enable */
49 #define ICCR0_TXE (1 << 3) /* Transmit enable */
50 #define ICCR0_TUS (1 << 2) /* Transmit FIFO underrun select */
51 #define ICCR0_LBM (1 << 1) /* Loopback mode */
52 #define ICCR0_ITR (1 << 0) /* IrDA transmission */
53
54 #define ICCR2_RXP (1 << 3) /* Receive Pin Polarity select */
55 #define ICCR2_TXP (1 << 2) /* Transmit Pin Polarity select */
56 #define ICCR2_TRIG (3 << 0) /* Receive FIFO Trigger threshold */
57 #define ICCR2_TRIG_8 (0 << 0) /* >= 8 bytes */
58 #define ICCR2_TRIG_16 (1 << 0) /* >= 16 bytes */
59 #define ICCR2_TRIG_32 (2 << 0) /* >= 32 bytes */
60
61 #define ICSR0_EOC (1 << 6) /* DMA End of Descriptor Chain */
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 /* macros for registers read/write */
103 #define ficp_writel(irda, val, off) \
104 do { \
105 dev_vdbg(irda->dev, \
106 "%s():%d ficp_writel(0x%x, %s)\n", \
107 __func__, __LINE__, (val), #off); \
108 writel_relaxed((val), (irda)->irda_base + (off)); \
109 } while (0)
110
111 #define ficp_readl(irda, off) \
112 ({ \
113 unsigned int _v; \
114 _v = readl_relaxed((irda)->irda_base + (off)); \
115 dev_vdbg(irda->dev, \
116 "%s():%d ficp_readl(%s): 0x%x\n", \
117 __func__, __LINE__, #off, _v); \
118 _v; \
119 })
120
121 #define stuart_writel(irda, val, off) \
122 do { \
123 dev_vdbg(irda->dev, \
124 "%s():%d stuart_writel(0x%x, %s)\n", \
125 __func__, __LINE__, (val), #off); \
126 writel_relaxed((val), (irda)->stuart_base + (off)); \
127 } while (0)
128
129 #define stuart_readl(irda, off) \
130 ({ \
131 unsigned int _v; \
132 _v = readl_relaxed((irda)->stuart_base + (off)); \
133 dev_vdbg(irda->dev, \
134 "%s():%d stuart_readl(%s): 0x%x\n", \
135 __func__, __LINE__, #off, _v); \
136 _v; \
137 })
138
139 struct pxa_irda {
140 int speed;
141 int newspeed;
142 unsigned long long last_clk;
143
144 void __iomem *stuart_base;
145 void __iomem *irda_base;
146 unsigned char *dma_rx_buff;
147 unsigned char *dma_tx_buff;
148 dma_addr_t dma_rx_buff_phy;
149 dma_addr_t dma_tx_buff_phy;
150 unsigned int dma_tx_buff_len;
151 struct dma_chan *txdma;
152 struct dma_chan *rxdma;
153 dma_cookie_t rx_cookie;
154 dma_cookie_t tx_cookie;
155 int drcmr_rx;
156 int drcmr_tx;
157
158 int uart_irq;
159 int icp_irq;
160
161 struct irlap_cb *irlap;
162 struct qos_info qos;
163
164 iobuff_t tx_buff;
165 iobuff_t rx_buff;
166
167 struct device *dev;
168 struct pxaficp_platform_data *pdata;
169 struct clk *fir_clk;
170 struct clk *sir_clk;
171 struct clk *cur_clk;
172 };
173
174 static int pxa_irda_set_speed(struct pxa_irda *si, int speed);
175
176 static inline void pxa_irda_disable_clk(struct pxa_irda *si)
177 {
178 if (si->cur_clk)
179 clk_disable_unprepare(si->cur_clk);
180 si->cur_clk = NULL;
181 }
182
183 static inline void pxa_irda_enable_firclk(struct pxa_irda *si)
184 {
185 si->cur_clk = si->fir_clk;
186 clk_prepare_enable(si->fir_clk);
187 }
188
189 static inline void pxa_irda_enable_sirclk(struct pxa_irda *si)
190 {
191 si->cur_clk = si->sir_clk;
192 clk_prepare_enable(si->sir_clk);
193 }
194
195
196 #define IS_FIR(si) ((si)->speed >= 4000000)
197 #define IRDA_FRAME_SIZE_LIMIT 2047
198
199 static void pxa_irda_fir_dma_rx_irq(void *data);
200 static void pxa_irda_fir_dma_tx_irq(void *data);
201
202 inline static void pxa_irda_fir_dma_rx_start(struct pxa_irda *si)
203 {
204 struct dma_async_tx_descriptor *tx;
205
206 tx = dmaengine_prep_slave_single(si->rxdma, si->dma_rx_buff_phy,
207 IRDA_FRAME_SIZE_LIMIT, DMA_FROM_DEVICE,
208 DMA_PREP_INTERRUPT);
209 if (!tx) {
210 dev_err(si->dev, "prep_slave_sg() failed\n");
211 return;
212 }
213 tx->callback = pxa_irda_fir_dma_rx_irq;
214 tx->callback_param = si;
215 si->rx_cookie = dmaengine_submit(tx);
216 dma_async_issue_pending(si->rxdma);
217 }
218
219 inline static void pxa_irda_fir_dma_tx_start(struct pxa_irda *si)
220 {
221 struct dma_async_tx_descriptor *tx;
222
223 tx = dmaengine_prep_slave_single(si->txdma, si->dma_tx_buff_phy,
224 si->dma_tx_buff_len, DMA_TO_DEVICE,
225 DMA_PREP_INTERRUPT);
226 if (!tx) {
227 dev_err(si->dev, "prep_slave_sg() failed\n");
228 return;
229 }
230 tx->callback = pxa_irda_fir_dma_tx_irq;
231 tx->callback_param = si;
232 si->tx_cookie = dmaengine_submit(tx);
233 dma_async_issue_pending(si->rxdma);
234 }
235
236 /*
237 * Set the IrDA communications mode.
238 */
239 static void pxa_irda_set_mode(struct pxa_irda *si, int mode)
240 {
241 if (si->pdata->transceiver_mode)
242 si->pdata->transceiver_mode(si->dev, mode);
243 else {
244 if (gpio_is_valid(si->pdata->gpio_pwdown))
245 gpio_set_value(si->pdata->gpio_pwdown,
246 !(mode & IR_OFF) ^
247 !si->pdata->gpio_pwdown_inverted);
248 pxa2xx_transceiver_mode(si->dev, mode);
249 }
250 }
251
252 /*
253 * Set the IrDA communications speed.
254 */
255 static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
256 {
257 unsigned long flags;
258 unsigned int divisor;
259
260 switch (speed) {
261 case 9600: case 19200: case 38400:
262 case 57600: case 115200:
263
264 /* refer to PXA250/210 Developer's Manual 10-7 */
265 /* BaudRate = 14.7456 MHz / (16*Divisor) */
266 divisor = 14745600 / (16 * speed);
267
268 local_irq_save(flags);
269
270 if (IS_FIR(si)) {
271 /* stop RX DMA */
272 dmaengine_terminate_all(si->rxdma);
273 /* disable FICP */
274 ficp_writel(si, 0, ICCR0);
275 pxa_irda_disable_clk(si);
276
277 /* set board transceiver to SIR mode */
278 pxa_irda_set_mode(si, IR_SIRMODE);
279
280 /* enable the STUART clock */
281 pxa_irda_enable_sirclk(si);
282 }
283
284 /* disable STUART first */
285 stuart_writel(si, 0, STIER);
286
287 /* access DLL & DLH */
288 stuart_writel(si, stuart_readl(si, STLCR) | LCR_DLAB, STLCR);
289 stuart_writel(si, divisor & 0xff, STDLL);
290 stuart_writel(si, divisor >> 8, STDLH);
291 stuart_writel(si, stuart_readl(si, STLCR) & ~LCR_DLAB, STLCR);
292
293 si->speed = speed;
294 stuart_writel(si, IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6,
295 STISR);
296 stuart_writel(si, IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE,
297 STIER);
298
299 local_irq_restore(flags);
300 break;
301
302 case 4000000:
303 local_irq_save(flags);
304
305 /* disable STUART */
306 stuart_writel(si, 0, STIER);
307 stuart_writel(si, 0, STISR);
308 pxa_irda_disable_clk(si);
309
310 /* disable FICP first */
311 ficp_writel(si, 0, ICCR0);
312
313 /* set board transceiver to FIR mode */
314 pxa_irda_set_mode(si, IR_FIRMODE);
315
316 /* enable the FICP clock */
317 pxa_irda_enable_firclk(si);
318
319 si->speed = speed;
320 pxa_irda_fir_dma_rx_start(si);
321 ficp_writel(si, ICCR0_ITR | ICCR0_RXE, ICCR0);
322
323 local_irq_restore(flags);
324 break;
325
326 default:
327 return -EINVAL;
328 }
329
330 return 0;
331 }
332
333 /* SIR interrupt service routine. */
334 static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
335 {
336 struct net_device *dev = dev_id;
337 struct pxa_irda *si = netdev_priv(dev);
338 int iir, lsr, data;
339
340 iir = stuart_readl(si, STIIR);
341
342 switch (iir & 0x0F) {
343 case 0x06: /* Receiver Line Status */
344 lsr = stuart_readl(si, STLSR);
345 while (lsr & LSR_FIFOE) {
346 data = stuart_readl(si, STRBR);
347 if (lsr & (LSR_OE | LSR_PE | LSR_FE | LSR_BI)) {
348 printk(KERN_DEBUG "pxa_ir: sir receiving error\n");
349 dev->stats.rx_errors++;
350 if (lsr & LSR_FE)
351 dev->stats.rx_frame_errors++;
352 if (lsr & LSR_OE)
353 dev->stats.rx_fifo_errors++;
354 } else {
355 dev->stats.rx_bytes++;
356 async_unwrap_char(dev, &dev->stats,
357 &si->rx_buff, data);
358 }
359 lsr = stuart_readl(si, STLSR);
360 }
361 si->last_clk = sched_clock();
362 break;
363
364 case 0x04: /* Received Data Available */
365 /* forth through */
366
367 case 0x0C: /* Character Timeout Indication */
368 do {
369 dev->stats.rx_bytes++;
370 async_unwrap_char(dev, &dev->stats, &si->rx_buff,
371 stuart_readl(si, STRBR));
372 } while (stuart_readl(si, STLSR) & LSR_DR);
373 si->last_clk = sched_clock();
374 break;
375
376 case 0x02: /* Transmit FIFO Data Request */
377 while ((si->tx_buff.len) &&
378 (stuart_readl(si, STLSR) & LSR_TDRQ)) {
379 stuart_writel(si, *si->tx_buff.data++, STTHR);
380 si->tx_buff.len -= 1;
381 }
382
383 if (si->tx_buff.len == 0) {
384 dev->stats.tx_packets++;
385 dev->stats.tx_bytes += si->tx_buff.data - si->tx_buff.head;
386
387 /* We need to ensure that the transmitter has finished. */
388 while ((stuart_readl(si, STLSR) & LSR_TEMT) == 0)
389 cpu_relax();
390 si->last_clk = sched_clock();
391
392 /*
393 * Ok, we've finished transmitting. Now enable
394 * the receiver. Sometimes we get a receive IRQ
395 * immediately after a transmit...
396 */
397 if (si->newspeed) {
398 pxa_irda_set_speed(si, si->newspeed);
399 si->newspeed = 0;
400 } else {
401 /* enable IR Receiver, disable IR Transmitter */
402 stuart_writel(si, IrSR_IR_RECEIVE_ON |
403 IrSR_XMODE_PULSE_1_6, STISR);
404 /* enable STUART and receive interrupts */
405 stuart_writel(si, IER_UUE | IER_RLSE |
406 IER_RAVIE | IER_RTIOE, STIER);
407 }
408 /* I'm hungry! */
409 netif_wake_queue(dev);
410 }
411 break;
412 }
413
414 return IRQ_HANDLED;
415 }
416
417 /* FIR Receive DMA interrupt handler */
418 static void pxa_irda_fir_dma_rx_irq(void *data)
419 {
420 struct net_device *dev = data;
421 struct pxa_irda *si = netdev_priv(dev);
422
423 dmaengine_terminate_all(si->rxdma);
424 netdev_dbg(dev, "pxa_ir: fir rx dma bus error\n");
425 }
426
427 /* FIR Transmit DMA interrupt handler */
428 static void pxa_irda_fir_dma_tx_irq(void *data)
429 {
430 struct net_device *dev = data;
431 struct pxa_irda *si = netdev_priv(dev);
432
433 dmaengine_terminate_all(si->txdma);
434 if (dmaengine_tx_status(si->txdma, si->tx_cookie, NULL) == DMA_ERROR) {
435 dev->stats.tx_errors++;
436 } else {
437 dev->stats.tx_packets++;
438 dev->stats.tx_bytes += si->dma_tx_buff_len;
439 }
440
441 while (ficp_readl(si, ICSR1) & ICSR1_TBY)
442 cpu_relax();
443 si->last_clk = sched_clock();
444
445 /*
446 * HACK: It looks like the TBY bit is dropped too soon.
447 * Without this delay things break.
448 */
449 udelay(120);
450
451 if (si->newspeed) {
452 pxa_irda_set_speed(si, si->newspeed);
453 si->newspeed = 0;
454 } else {
455 int i = 64;
456
457 ficp_writel(si, 0, ICCR0);
458 pxa_irda_fir_dma_rx_start(si);
459 while ((ficp_readl(si, ICSR1) & ICSR1_RNE) && i--)
460 ficp_readl(si, ICDR);
461 ficp_writel(si, ICCR0_ITR | ICCR0_RXE, ICCR0);
462
463 if (i < 0)
464 printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
465 }
466 netif_wake_queue(dev);
467 }
468
469 /* EIF(Error in FIFO/End in Frame) handler for FIR */
470 static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev, int icsr0)
471 {
472 unsigned int len, stat, data;
473 struct dma_tx_state state;
474
475 /* Get the current data position. */
476
477 dmaengine_tx_status(si->rxdma, si->rx_cookie, &state);
478 len = IRDA_FRAME_SIZE_LIMIT - state.residue;
479
480 do {
481 /* Read Status, and then Data. */
482 stat = ficp_readl(si, ICSR1);
483 rmb();
484 data = ficp_readl(si, ICDR);
485
486 if (stat & (ICSR1_CRE | ICSR1_ROR)) {
487 dev->stats.rx_errors++;
488 if (stat & ICSR1_CRE) {
489 printk(KERN_DEBUG "pxa_ir: fir receive CRC error\n");
490 dev->stats.rx_crc_errors++;
491 }
492 if (stat & ICSR1_ROR) {
493 printk(KERN_DEBUG "pxa_ir: fir receive overrun\n");
494 dev->stats.rx_over_errors++;
495 }
496 } else {
497 si->dma_rx_buff[len++] = data;
498 }
499 /* If we hit the end of frame, there's no point in continuing. */
500 if (stat & ICSR1_EOF)
501 break;
502 } while (ficp_readl(si, ICSR0) & ICSR0_EIF);
503
504 if (stat & ICSR1_EOF) {
505 /* end of frame. */
506 struct sk_buff *skb;
507
508 if (icsr0 & ICSR0_FRE) {
509 printk(KERN_ERR "pxa_ir: dropping erroneous frame\n");
510 dev->stats.rx_dropped++;
511 return;
512 }
513
514 skb = alloc_skb(len+1,GFP_ATOMIC);
515 if (!skb) {
516 printk(KERN_ERR "pxa_ir: fir out of memory for receive skb\n");
517 dev->stats.rx_dropped++;
518 return;
519 }
520
521 /* Align IP header to 20 bytes */
522 skb_reserve(skb, 1);
523 skb_copy_to_linear_data(skb, si->dma_rx_buff, len);
524 skb_put(skb, len);
525
526 /* Feed it to IrLAP */
527 skb->dev = dev;
528 skb_reset_mac_header(skb);
529 skb->protocol = htons(ETH_P_IRDA);
530 netif_rx(skb);
531
532 dev->stats.rx_packets++;
533 dev->stats.rx_bytes += len;
534 }
535 }
536
537 /* FIR interrupt handler */
538 static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
539 {
540 struct net_device *dev = dev_id;
541 struct pxa_irda *si = netdev_priv(dev);
542 int icsr0, i = 64;
543
544 /* stop RX DMA */
545 dmaengine_terminate_all(si->rxdma);
546 si->last_clk = sched_clock();
547 icsr0 = ficp_readl(si, ICSR0);
548
549 if (icsr0 & (ICSR0_FRE | ICSR0_RAB)) {
550 if (icsr0 & ICSR0_FRE) {
551 printk(KERN_DEBUG "pxa_ir: fir receive frame error\n");
552 dev->stats.rx_frame_errors++;
553 } else {
554 printk(KERN_DEBUG "pxa_ir: fir receive abort\n");
555 dev->stats.rx_errors++;
556 }
557 ficp_writel(si, icsr0 & (ICSR0_FRE | ICSR0_RAB), ICSR0);
558 }
559
560 if (icsr0 & ICSR0_EIF) {
561 /* An error in FIFO occurred, or there is a end of frame */
562 pxa_irda_fir_irq_eif(si, dev, icsr0);
563 }
564
565 ficp_writel(si, 0, ICCR0);
566 pxa_irda_fir_dma_rx_start(si);
567 while ((ficp_readl(si, ICSR1) & ICSR1_RNE) && i--)
568 ficp_readl(si, ICDR);
569 ficp_writel(si, ICCR0_ITR | ICCR0_RXE, ICCR0);
570
571 if (i < 0)
572 printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
573
574 return IRQ_HANDLED;
575 }
576
577 /* hard_xmit interface of irda device */
578 static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
579 {
580 struct pxa_irda *si = netdev_priv(dev);
581 int speed = irda_get_next_speed(skb);
582
583 /*
584 * Does this packet contain a request to change the interface
585 * speed? If so, remember it until we complete the transmission
586 * of this frame.
587 */
588 if (speed != si->speed && speed != -1)
589 si->newspeed = speed;
590
591 /*
592 * If this is an empty frame, we can bypass a lot.
593 */
594 if (skb->len == 0) {
595 if (si->newspeed) {
596 si->newspeed = 0;
597 pxa_irda_set_speed(si, speed);
598 }
599 dev_kfree_skb(skb);
600 return NETDEV_TX_OK;
601 }
602
603 netif_stop_queue(dev);
604
605 if (!IS_FIR(si)) {
606 si->tx_buff.data = si->tx_buff.head;
607 si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data, si->tx_buff.truesize);
608
609 /* Disable STUART interrupts and switch to transmit mode. */
610 stuart_writel(si, 0, STIER);
611 stuart_writel(si, IrSR_IR_TRANSMIT_ON | IrSR_XMODE_PULSE_1_6,
612 STISR);
613
614 /* enable STUART and transmit interrupts */
615 stuart_writel(si, IER_UUE | IER_TIE, STIER);
616 } else {
617 unsigned long mtt = irda_get_mtt(skb);
618
619 si->dma_tx_buff_len = skb->len;
620 skb_copy_from_linear_data(skb, si->dma_tx_buff, skb->len);
621
622 if (mtt)
623 while ((sched_clock() - si->last_clk) * 1000 < mtt)
624 cpu_relax();
625
626 /* stop RX DMA, disable FICP */
627 dmaengine_terminate_all(si->rxdma);
628 ficp_writel(si, 0, ICCR0);
629
630 pxa_irda_fir_dma_tx_start(si);
631 ficp_writel(si, ICCR0_ITR | ICCR0_TXE, ICCR0);
632 }
633
634 dev_kfree_skb(skb);
635 return NETDEV_TX_OK;
636 }
637
638 static int pxa_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
639 {
640 struct if_irda_req *rq = (struct if_irda_req *)ifreq;
641 struct pxa_irda *si = netdev_priv(dev);
642 int ret;
643
644 switch (cmd) {
645 case SIOCSBANDWIDTH:
646 ret = -EPERM;
647 if (capable(CAP_NET_ADMIN)) {
648 /*
649 * We are unable to set the speed if the
650 * device is not running.
651 */
652 if (netif_running(dev)) {
653 ret = pxa_irda_set_speed(si,
654 rq->ifr_baudrate);
655 } else {
656 printk(KERN_INFO "pxa_ir: SIOCSBANDWIDTH: !netif_running\n");
657 ret = 0;
658 }
659 }
660 break;
661
662 case SIOCSMEDIABUSY:
663 ret = -EPERM;
664 if (capable(CAP_NET_ADMIN)) {
665 irda_device_set_media_busy(dev, TRUE);
666 ret = 0;
667 }
668 break;
669
670 case SIOCGRECEIVING:
671 ret = 0;
672 rq->ifr_receiving = IS_FIR(si) ? 0
673 : si->rx_buff.state != OUTSIDE_FRAME;
674 break;
675
676 default:
677 ret = -EOPNOTSUPP;
678 break;
679 }
680
681 return ret;
682 }
683
684 static void pxa_irda_startup(struct pxa_irda *si)
685 {
686 /* Disable STUART interrupts */
687 stuart_writel(si, 0, STIER);
688 /* enable STUART interrupt to the processor */
689 stuart_writel(si, MCR_OUT2, STMCR);
690 /* configure SIR frame format: StartBit - Data 7 ... Data 0 - Stop Bit */
691 stuart_writel(si, LCR_WLS0 | LCR_WLS1, STLCR);
692 /* enable FIFO, we use FIFO to improve performance */
693 stuart_writel(si, FCR_TRFIFOE | FCR_ITL_32, STFCR);
694
695 /* disable FICP */
696 ficp_writel(si, 0, ICCR0);
697 /* configure FICP ICCR2 */
698 ficp_writel(si, ICCR2_TXP | ICCR2_TRIG_32, ICCR2);
699
700 /* force SIR reinitialization */
701 si->speed = 4000000;
702 pxa_irda_set_speed(si, 9600);
703
704 printk(KERN_DEBUG "pxa_ir: irda startup\n");
705 }
706
707 static void pxa_irda_shutdown(struct pxa_irda *si)
708 {
709 unsigned long flags;
710
711 local_irq_save(flags);
712
713 /* disable STUART and interrupt */
714 stuart_writel(si, 0, STIER);
715 /* disable STUART SIR mode */
716 stuart_writel(si, 0, STISR);
717
718 /* disable DMA */
719 dmaengine_terminate_all(si->rxdma);
720 dmaengine_terminate_all(si->txdma);
721 /* disable FICP */
722 ficp_writel(si, 0, ICCR0);
723
724 /* disable the STUART or FICP clocks */
725 pxa_irda_disable_clk(si);
726
727 local_irq_restore(flags);
728
729 /* power off board transceiver */
730 pxa_irda_set_mode(si, IR_OFF);
731
732 printk(KERN_DEBUG "pxa_ir: irda shutdown\n");
733 }
734
735 static int pxa_irda_start(struct net_device *dev)
736 {
737 struct pxa_irda *si = netdev_priv(dev);
738 dma_cap_mask_t mask;
739 struct dma_slave_config config;
740 struct pxad_param param;
741 int err;
742
743 si->speed = 9600;
744
745 err = request_irq(si->uart_irq, pxa_irda_sir_irq, 0, dev->name, dev);
746 if (err)
747 goto err_irq1;
748
749 err = request_irq(si->icp_irq, pxa_irda_fir_irq, 0, dev->name, dev);
750 if (err)
751 goto err_irq2;
752
753 /*
754 * The interrupt must remain disabled for now.
755 */
756 disable_irq(si->uart_irq);
757 disable_irq(si->icp_irq);
758
759 err = -EBUSY;
760 dma_cap_zero(mask);
761 dma_cap_set(DMA_SLAVE, mask);
762 param.prio = PXAD_PRIO_LOWEST;
763
764 memset(&config, 0, sizeof(config));
765 config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
766 config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
767 config.src_addr = (dma_addr_t)si->irda_base + ICDR;
768 config.dst_addr = (dma_addr_t)si->irda_base + ICDR;
769 config.src_maxburst = 32;
770 config.dst_maxburst = 32;
771
772 param.drcmr = si->drcmr_rx;
773 si->rxdma = dma_request_slave_channel_compat(mask, pxad_filter_fn,
774 &param, &dev->dev, "rx");
775 if (!si->rxdma)
776 goto err_rx_dma;
777
778 param.drcmr = si->drcmr_tx;
779 si->txdma = dma_request_slave_channel_compat(mask, pxad_filter_fn,
780 &param, &dev->dev, "tx");
781 if (!si->txdma)
782 goto err_tx_dma;
783
784 err = dmaengine_slave_config(si->rxdma, &config);
785 if (err)
786 goto err_dma_rx_buff;
787 err = dmaengine_slave_config(si->txdma, &config);
788 if (err)
789 goto err_dma_rx_buff;
790
791 err = -ENOMEM;
792 si->dma_rx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
793 &si->dma_rx_buff_phy, GFP_KERNEL);
794 if (!si->dma_rx_buff)
795 goto err_dma_rx_buff;
796
797 si->dma_tx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
798 &si->dma_tx_buff_phy, GFP_KERNEL);
799 if (!si->dma_tx_buff)
800 goto err_dma_tx_buff;
801
802 /* Setup the serial port for the initial speed. */
803 pxa_irda_startup(si);
804
805 /*
806 * Open a new IrLAP layer instance.
807 */
808 si->irlap = irlap_open(dev, &si->qos, "pxa");
809 err = -ENOMEM;
810 if (!si->irlap)
811 goto err_irlap;
812
813 /*
814 * Now enable the interrupt and start the queue
815 */
816 enable_irq(si->uart_irq);
817 enable_irq(si->icp_irq);
818 netif_start_queue(dev);
819
820 printk(KERN_DEBUG "pxa_ir: irda driver opened\n");
821
822 return 0;
823
824 err_irlap:
825 pxa_irda_shutdown(si);
826 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
827 err_dma_tx_buff:
828 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
829 err_dma_rx_buff:
830 dma_release_channel(si->txdma);
831 err_tx_dma:
832 dma_release_channel(si->rxdma);
833 err_rx_dma:
834 free_irq(si->icp_irq, dev);
835 err_irq2:
836 free_irq(si->uart_irq, dev);
837 err_irq1:
838
839 return err;
840 }
841
842 static int pxa_irda_stop(struct net_device *dev)
843 {
844 struct pxa_irda *si = netdev_priv(dev);
845
846 netif_stop_queue(dev);
847
848 pxa_irda_shutdown(si);
849
850 /* Stop IrLAP */
851 if (si->irlap) {
852 irlap_close(si->irlap);
853 si->irlap = NULL;
854 }
855
856 free_irq(si->uart_irq, dev);
857 free_irq(si->icp_irq, dev);
858
859 dmaengine_terminate_all(si->rxdma);
860 dmaengine_terminate_all(si->txdma);
861 dma_release_channel(si->rxdma);
862 dma_release_channel(si->txdma);
863
864 if (si->dma_rx_buff)
865 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
866 if (si->dma_tx_buff)
867 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
868
869 printk(KERN_DEBUG "pxa_ir: irda driver closed\n");
870 return 0;
871 }
872
873 static int pxa_irda_suspend(struct platform_device *_dev, pm_message_t state)
874 {
875 struct net_device *dev = platform_get_drvdata(_dev);
876 struct pxa_irda *si;
877
878 if (dev && netif_running(dev)) {
879 si = netdev_priv(dev);
880 netif_device_detach(dev);
881 pxa_irda_shutdown(si);
882 }
883
884 return 0;
885 }
886
887 static int pxa_irda_resume(struct platform_device *_dev)
888 {
889 struct net_device *dev = platform_get_drvdata(_dev);
890 struct pxa_irda *si;
891
892 if (dev && netif_running(dev)) {
893 si = netdev_priv(dev);
894 pxa_irda_startup(si);
895 netif_device_attach(dev);
896 netif_wake_queue(dev);
897 }
898
899 return 0;
900 }
901
902
903 static int pxa_irda_init_iobuf(iobuff_t *io, int size)
904 {
905 io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
906 if (io->head != NULL) {
907 io->truesize = size;
908 io->in_frame = FALSE;
909 io->state = OUTSIDE_FRAME;
910 io->data = io->head;
911 }
912 return io->head ? 0 : -ENOMEM;
913 }
914
915 static const struct net_device_ops pxa_irda_netdev_ops = {
916 .ndo_open = pxa_irda_start,
917 .ndo_stop = pxa_irda_stop,
918 .ndo_start_xmit = pxa_irda_hard_xmit,
919 .ndo_do_ioctl = pxa_irda_ioctl,
920 };
921
922 static int pxa_irda_probe(struct platform_device *pdev)
923 {
924 struct net_device *dev;
925 struct resource *res;
926 struct pxa_irda *si;
927 void __iomem *ficp, *stuart;
928 unsigned int baudrate_mask;
929 int err;
930
931 if (!pdev->dev.platform_data)
932 return -ENODEV;
933
934 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
935 ficp = devm_ioremap_resource(&pdev->dev, res);
936 if (IS_ERR(ficp)) {
937 dev_err(&pdev->dev, "resource ficp not defined\n");
938 return PTR_ERR(ficp);
939 }
940
941 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
942 stuart = devm_ioremap_resource(&pdev->dev, res);
943 if (IS_ERR(stuart)) {
944 dev_err(&pdev->dev, "resource stuart not defined\n");
945 return PTR_ERR(stuart);
946 }
947
948 dev = alloc_irdadev(sizeof(struct pxa_irda));
949 if (!dev) {
950 err = -ENOMEM;
951 goto err_mem_1;
952 }
953
954 SET_NETDEV_DEV(dev, &pdev->dev);
955 si = netdev_priv(dev);
956 si->dev = &pdev->dev;
957 si->pdata = pdev->dev.platform_data;
958
959 si->irda_base = ficp;
960 si->stuart_base = stuart;
961 si->uart_irq = platform_get_irq(pdev, 0);
962 si->icp_irq = platform_get_irq(pdev, 1);
963
964 si->sir_clk = devm_clk_get(&pdev->dev, "UARTCLK");
965 si->fir_clk = devm_clk_get(&pdev->dev, "FICPCLK");
966 if (IS_ERR(si->sir_clk) || IS_ERR(si->fir_clk)) {
967 err = PTR_ERR(IS_ERR(si->sir_clk) ? si->sir_clk : si->fir_clk);
968 goto err_mem_4;
969 }
970
971 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
972 if (res)
973 si->drcmr_rx = res->start;
974 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
975 if (res)
976 si->drcmr_tx = res->start;
977
978 /*
979 * Initialise the SIR buffers
980 */
981 err = pxa_irda_init_iobuf(&si->rx_buff, 14384);
982 if (err)
983 goto err_mem_4;
984 err = pxa_irda_init_iobuf(&si->tx_buff, 4000);
985 if (err)
986 goto err_mem_5;
987
988 if (gpio_is_valid(si->pdata->gpio_pwdown)) {
989 err = gpio_request(si->pdata->gpio_pwdown, "IrDA switch");
990 if (err)
991 goto err_startup;
992 err = gpio_direction_output(si->pdata->gpio_pwdown,
993 !si->pdata->gpio_pwdown_inverted);
994 if (err) {
995 gpio_free(si->pdata->gpio_pwdown);
996 goto err_startup;
997 }
998 }
999
1000 if (si->pdata->startup) {
1001 err = si->pdata->startup(si->dev);
1002 if (err)
1003 goto err_startup;
1004 }
1005
1006 if (gpio_is_valid(si->pdata->gpio_pwdown) && si->pdata->startup)
1007 dev_warn(si->dev, "gpio_pwdown and startup() both defined!\n");
1008
1009 dev->netdev_ops = &pxa_irda_netdev_ops;
1010
1011 irda_init_max_qos_capabilies(&si->qos);
1012
1013 baudrate_mask = 0;
1014 if (si->pdata->transceiver_cap & IR_SIRMODE)
1015 baudrate_mask |= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
1016 if (si->pdata->transceiver_cap & IR_FIRMODE)
1017 baudrate_mask |= IR_4000000 << 8;
1018
1019 si->qos.baud_rate.bits &= baudrate_mask;
1020 si->qos.min_turn_time.bits = 7; /* 1ms or more */
1021
1022 irda_qos_bits_to_value(&si->qos);
1023
1024 err = register_netdev(dev);
1025
1026 if (err == 0)
1027 platform_set_drvdata(pdev, dev);
1028
1029 if (err) {
1030 if (si->pdata->shutdown)
1031 si->pdata->shutdown(si->dev);
1032 err_startup:
1033 kfree(si->tx_buff.head);
1034 err_mem_5:
1035 kfree(si->rx_buff.head);
1036 err_mem_4:
1037 free_netdev(dev);
1038 }
1039 err_mem_1:
1040 return err;
1041 }
1042
1043 static int pxa_irda_remove(struct platform_device *_dev)
1044 {
1045 struct net_device *dev = platform_get_drvdata(_dev);
1046
1047 if (dev) {
1048 struct pxa_irda *si = netdev_priv(dev);
1049 unregister_netdev(dev);
1050 if (gpio_is_valid(si->pdata->gpio_pwdown))
1051 gpio_free(si->pdata->gpio_pwdown);
1052 if (si->pdata->shutdown)
1053 si->pdata->shutdown(si->dev);
1054 kfree(si->tx_buff.head);
1055 kfree(si->rx_buff.head);
1056 free_netdev(dev);
1057 }
1058
1059 return 0;
1060 }
1061
1062 static struct platform_driver pxa_ir_driver = {
1063 .driver = {
1064 .name = "pxa2xx-ir",
1065 },
1066 .probe = pxa_irda_probe,
1067 .remove = pxa_irda_remove,
1068 .suspend = pxa_irda_suspend,
1069 .resume = pxa_irda_resume,
1070 };
1071
1072 module_platform_driver(pxa_ir_driver);
1073
1074 MODULE_LICENSE("GPL");
1075 MODULE_ALIAS("platform:pxa2xx-ir");
Linux kernel - Deliverables
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