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omap: McBSP: Use macros for all register read/write operations
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / arm / plat-omap / mcbsp.c
blobeaaf53bb83953fa8eb4ecebf91d4a015e04aad49
1 /*
2 * linux/arch/arm/plat-omap/mcbsp.c
3 *
4 * Copyright (C) 2004 Nokia Corporation
5 * Author: Samuel Ortiz <samuel.ortiz@nokia.com>
6 *
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 * Multichannel mode not supported.
13 */
14
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/device.h>
18 #include <linux/platform_device.h>
19 #include <linux/wait.h>
20 #include <linux/completion.h>
21 #include <linux/interrupt.h>
22 #include <linux/err.h>
23 #include <linux/clk.h>
24 #include <linux/delay.h>
25 #include <linux/io.h>
26
27 #include <plat/dma.h>
28 #include <plat/mcbsp.h>
29
30 struct omap_mcbsp **mcbsp_ptr;
31 int omap_mcbsp_count;
32
33 void omap_mcbsp_write(void __iomem *io_base, u16 reg, u32 val)
34 {
35 if (cpu_class_is_omap1() || cpu_is_omap2420())
36 __raw_writew((u16)val, io_base + reg);
37 else
38 __raw_writel(val, io_base + reg);
39 }
40
41 int omap_mcbsp_read(void __iomem *io_base, u16 reg)
42 {
43 if (cpu_class_is_omap1() || cpu_is_omap2420())
44 return __raw_readw(io_base + reg);
45 else
46 return __raw_readl(io_base + reg);
47 }
48
49 #define OMAP_MCBSP_READ(base, reg) \
50 omap_mcbsp_read(base, OMAP_MCBSP_REG_##reg)
51 #define OMAP_MCBSP_WRITE(base, reg, val) \
52 omap_mcbsp_write(base, OMAP_MCBSP_REG_##reg, val)
53
54 #define omap_mcbsp_check_valid_id(id) (id < omap_mcbsp_count)
55 #define id_to_mcbsp_ptr(id) mcbsp_ptr[id];
56
57 static void omap_mcbsp_dump_reg(u8 id)
58 {
59 struct omap_mcbsp *mcbsp = id_to_mcbsp_ptr(id);
60
61 dev_dbg(mcbsp->dev, "**** McBSP%d regs ****\n", mcbsp->id);
62 dev_dbg(mcbsp->dev, "DRR2: 0x%04x\n",
63 OMAP_MCBSP_READ(mcbsp->io_base, DRR2));
64 dev_dbg(mcbsp->dev, "DRR1: 0x%04x\n",
65 OMAP_MCBSP_READ(mcbsp->io_base, DRR1));
66 dev_dbg(mcbsp->dev, "DXR2: 0x%04x\n",
67 OMAP_MCBSP_READ(mcbsp->io_base, DXR2));
68 dev_dbg(mcbsp->dev, "DXR1: 0x%04x\n",
69 OMAP_MCBSP_READ(mcbsp->io_base, DXR1));
70 dev_dbg(mcbsp->dev, "SPCR2: 0x%04x\n",
71 OMAP_MCBSP_READ(mcbsp->io_base, SPCR2));
72 dev_dbg(mcbsp->dev, "SPCR1: 0x%04x\n",
73 OMAP_MCBSP_READ(mcbsp->io_base, SPCR1));
74 dev_dbg(mcbsp->dev, "RCR2: 0x%04x\n",
75 OMAP_MCBSP_READ(mcbsp->io_base, RCR2));
76 dev_dbg(mcbsp->dev, "RCR1: 0x%04x\n",
77 OMAP_MCBSP_READ(mcbsp->io_base, RCR1));
78 dev_dbg(mcbsp->dev, "XCR2: 0x%04x\n",
79 OMAP_MCBSP_READ(mcbsp->io_base, XCR2));
80 dev_dbg(mcbsp->dev, "XCR1: 0x%04x\n",
81 OMAP_MCBSP_READ(mcbsp->io_base, XCR1));
82 dev_dbg(mcbsp->dev, "SRGR2: 0x%04x\n",
83 OMAP_MCBSP_READ(mcbsp->io_base, SRGR2));
84 dev_dbg(mcbsp->dev, "SRGR1: 0x%04x\n",
85 OMAP_MCBSP_READ(mcbsp->io_base, SRGR1));
86 dev_dbg(mcbsp->dev, "PCR0: 0x%04x\n",
87 OMAP_MCBSP_READ(mcbsp->io_base, PCR0));
88 dev_dbg(mcbsp->dev, "***********************\n");
89 }
90
91 static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
92 {
93 struct omap_mcbsp *mcbsp_tx = dev_id;
94 u16 irqst_spcr2;
95
96 irqst_spcr2 = OMAP_MCBSP_READ(mcbsp_tx->io_base, SPCR2);
97 dev_dbg(mcbsp_tx->dev, "TX IRQ callback : 0x%x\n", irqst_spcr2);
98
99 if (irqst_spcr2 & XSYNC_ERR) {
100 dev_err(mcbsp_tx->dev, "TX Frame Sync Error! : 0x%x\n",
101 irqst_spcr2);
102 /* Writing zero to XSYNC_ERR clears the IRQ */
103 OMAP_MCBSP_WRITE(mcbsp_tx->io_base, SPCR2,
104 irqst_spcr2 & ~(XSYNC_ERR));
105 } else {
106 complete(&mcbsp_tx->tx_irq_completion);
107 }
108
109 return IRQ_HANDLED;
110 }
111
112 static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id)
113 {
114 struct omap_mcbsp *mcbsp_rx = dev_id;
115 u16 irqst_spcr1;
116
117 irqst_spcr1 = OMAP_MCBSP_READ(mcbsp_rx->io_base, SPCR1);
118 dev_dbg(mcbsp_rx->dev, "RX IRQ callback : 0x%x\n", irqst_spcr1);
119
120 if (irqst_spcr1 & RSYNC_ERR) {
121 dev_err(mcbsp_rx->dev, "RX Frame Sync Error! : 0x%x\n",
122 irqst_spcr1);
123 /* Writing zero to RSYNC_ERR clears the IRQ */
124 OMAP_MCBSP_WRITE(mcbsp_rx->io_base, SPCR1,
125 irqst_spcr1 & ~(RSYNC_ERR));
126 } else {
127 complete(&mcbsp_rx->tx_irq_completion);
128 }
129
130 return IRQ_HANDLED;
131 }
132
133 static void omap_mcbsp_tx_dma_callback(int lch, u16 ch_status, void *data)
134 {
135 struct omap_mcbsp *mcbsp_dma_tx = data;
136
137 dev_dbg(mcbsp_dma_tx->dev, "TX DMA callback : 0x%x\n",
138 OMAP_MCBSP_READ(mcbsp_dma_tx->io_base, SPCR2));
139
140 /* We can free the channels */
141 omap_free_dma(mcbsp_dma_tx->dma_tx_lch);
142 mcbsp_dma_tx->dma_tx_lch = -1;
143
144 complete(&mcbsp_dma_tx->tx_dma_completion);
145 }
146
147 static void omap_mcbsp_rx_dma_callback(int lch, u16 ch_status, void *data)
148 {
149 struct omap_mcbsp *mcbsp_dma_rx = data;
150
151 dev_dbg(mcbsp_dma_rx->dev, "RX DMA callback : 0x%x\n",
152 OMAP_MCBSP_READ(mcbsp_dma_rx->io_base, SPCR2));
153
154 /* We can free the channels */
155 omap_free_dma(mcbsp_dma_rx->dma_rx_lch);
156 mcbsp_dma_rx->dma_rx_lch = -1;
157
158 complete(&mcbsp_dma_rx->rx_dma_completion);
159 }
160
161 /*
162 * omap_mcbsp_config simply write a config to the
163 * appropriate McBSP.
164 * You either call this function or set the McBSP registers
165 * by yourself before calling omap_mcbsp_start().
166 */
167 void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg *config)
168 {
169 struct omap_mcbsp *mcbsp;
170 void __iomem *io_base;
171
172 if (!omap_mcbsp_check_valid_id(id)) {
173 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
174 return;
175 }
176 mcbsp = id_to_mcbsp_ptr(id);
177
178 io_base = mcbsp->io_base;
179 dev_dbg(mcbsp->dev, "Configuring McBSP%d phys_base: 0x%08lx\n",
180 mcbsp->id, mcbsp->phys_base);
181
182 /* We write the given config */
183 OMAP_MCBSP_WRITE(io_base, SPCR2, config->spcr2);
184 OMAP_MCBSP_WRITE(io_base, SPCR1, config->spcr1);
185 OMAP_MCBSP_WRITE(io_base, RCR2, config->rcr2);
186 OMAP_MCBSP_WRITE(io_base, RCR1, config->rcr1);
187 OMAP_MCBSP_WRITE(io_base, XCR2, config->xcr2);
188 OMAP_MCBSP_WRITE(io_base, XCR1, config->xcr1);
189 OMAP_MCBSP_WRITE(io_base, SRGR2, config->srgr2);
190 OMAP_MCBSP_WRITE(io_base, SRGR1, config->srgr1);
191 OMAP_MCBSP_WRITE(io_base, MCR2, config->mcr2);
192 OMAP_MCBSP_WRITE(io_base, MCR1, config->mcr1);
193 OMAP_MCBSP_WRITE(io_base, PCR0, config->pcr0);
194 if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx()) {
195 OMAP_MCBSP_WRITE(io_base, XCCR, config->xccr);
196 OMAP_MCBSP_WRITE(io_base, RCCR, config->rccr);
197 }
198 }
199 EXPORT_SYMBOL(omap_mcbsp_config);
200
201 #ifdef CONFIG_ARCH_OMAP3
202 /*
203 * omap_mcbsp_set_tx_threshold configures how to deal
204 * with transmit threshold. the threshold value and handler can be
205 * configure in here.
206 */
207 void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold)
208 {
209 struct omap_mcbsp *mcbsp;
210 void __iomem *io_base;
211
212 if (!cpu_is_omap34xx())
213 return;
214
215 if (!omap_mcbsp_check_valid_id(id)) {
216 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
217 return;
218 }
219 mcbsp = id_to_mcbsp_ptr(id);
220 io_base = mcbsp->io_base;
221
222 OMAP_MCBSP_WRITE(io_base, THRSH2, threshold);
223 }
224 EXPORT_SYMBOL(omap_mcbsp_set_tx_threshold);
225
226 /*
227 * omap_mcbsp_set_rx_threshold configures how to deal
228 * with receive threshold. the threshold value and handler can be
229 * configure in here.
230 */
231 void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold)
232 {
233 struct omap_mcbsp *mcbsp;
234 void __iomem *io_base;
235
236 if (!cpu_is_omap34xx())
237 return;
238
239 if (!omap_mcbsp_check_valid_id(id)) {
240 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
241 return;
242 }
243 mcbsp = id_to_mcbsp_ptr(id);
244 io_base = mcbsp->io_base;
245
246 OMAP_MCBSP_WRITE(io_base, THRSH1, threshold);
247 }
248 EXPORT_SYMBOL(omap_mcbsp_set_rx_threshold);
249
250 /*
251 * omap_mcbsp_get_max_tx_thres just return the current configured
252 * maximum threshold for transmission
253 */
254 u16 omap_mcbsp_get_max_tx_threshold(unsigned int id)
255 {
256 struct omap_mcbsp *mcbsp;
257
258 if (!omap_mcbsp_check_valid_id(id)) {
259 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
260 return -ENODEV;
261 }
262 mcbsp = id_to_mcbsp_ptr(id);
263
264 return mcbsp->max_tx_thres;
265 }
266 EXPORT_SYMBOL(omap_mcbsp_get_max_tx_threshold);
267
268 /*
269 * omap_mcbsp_get_max_rx_thres just return the current configured
270 * maximum threshold for reception
271 */
272 u16 omap_mcbsp_get_max_rx_threshold(unsigned int id)
273 {
274 struct omap_mcbsp *mcbsp;
275
276 if (!omap_mcbsp_check_valid_id(id)) {
277 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
278 return -ENODEV;
279 }
280 mcbsp = id_to_mcbsp_ptr(id);
281
282 return mcbsp->max_rx_thres;
283 }
284 EXPORT_SYMBOL(omap_mcbsp_get_max_rx_threshold);
285
286 /*
287 * omap_mcbsp_get_dma_op_mode just return the current configured
288 * operating mode for the mcbsp channel
289 */
290 int omap_mcbsp_get_dma_op_mode(unsigned int id)
291 {
292 struct omap_mcbsp *mcbsp;
293 int dma_op_mode;
294
295 if (!omap_mcbsp_check_valid_id(id)) {
296 printk(KERN_ERR "%s: Invalid id (%u)\n", __func__, id + 1);
297 return -ENODEV;
298 }
299 mcbsp = id_to_mcbsp_ptr(id);
300
301 dma_op_mode = mcbsp->dma_op_mode;
302
303 return dma_op_mode;
304 }
305 EXPORT_SYMBOL(omap_mcbsp_get_dma_op_mode);
306
307 static inline void omap34xx_mcbsp_request(struct omap_mcbsp *mcbsp)
308 {
309 /*
310 * Enable wakup behavior, smart idle and all wakeups
311 * REVISIT: some wakeups may be unnecessary
312 */
313 if (cpu_is_omap34xx()) {
314 u16 syscon;
315
316 syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON);
317 syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03) | CLOCKACTIVITY(0x03));
318
319 if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) {
320 syscon |= (ENAWAKEUP | SIDLEMODE(0x02) |
321 CLOCKACTIVITY(0x02));
322 OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN,
323 XRDYEN | RRDYEN);
324 } else {
325 syscon |= SIDLEMODE(0x01);
326 }
327
328 OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
329 }
330 }
331
332 static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp)
333 {
334 /*
335 * Disable wakup behavior, smart idle and all wakeups
336 */
337 if (cpu_is_omap34xx()) {
338 u16 syscon;
339
340 syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON);
341 syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03) | CLOCKACTIVITY(0x03));
342 /*
343 * HW bug workaround - If no_idle mode is taken, we need to
344 * go to smart_idle before going to always_idle, or the
345 * device will not hit retention anymore.
346 */
347 syscon |= SIDLEMODE(0x02);
348 OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
349
350 syscon &= ~(SIDLEMODE(0x03));
351 OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
352
353 OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN, 0);
354 }
355 }
356 #else
357 static inline void omap34xx_mcbsp_request(struct omap_mcbsp *mcbsp) {}
358 static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp) {}
359 #endif
360
361 /*
362 * We can choose between IRQ based or polled IO.
363 * This needs to be called before omap_mcbsp_request().
364 */
365 int omap_mcbsp_set_io_type(unsigned int id, omap_mcbsp_io_type_t io_type)
366 {
367 struct omap_mcbsp *mcbsp;
368
369 if (!omap_mcbsp_check_valid_id(id)) {
370 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
371 return -ENODEV;
372 }
373 mcbsp = id_to_mcbsp_ptr(id);
374
375 spin_lock(&mcbsp->lock);
376
377 if (!mcbsp->free) {
378 dev_err(mcbsp->dev, "McBSP%d is currently in use\n",
379 mcbsp->id);
380 spin_unlock(&mcbsp->lock);
381 return -EINVAL;
382 }
383
384 mcbsp->io_type = io_type;
385
386 spin_unlock(&mcbsp->lock);
387
388 return 0;
389 }
390 EXPORT_SYMBOL(omap_mcbsp_set_io_type);
391
392 int omap_mcbsp_request(unsigned int id)
393 {
394 struct omap_mcbsp *mcbsp;
395 int err;
396
397 if (!omap_mcbsp_check_valid_id(id)) {
398 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
399 return -ENODEV;
400 }
401 mcbsp = id_to_mcbsp_ptr(id);
402
403 spin_lock(&mcbsp->lock);
404 if (!mcbsp->free) {
405 dev_err(mcbsp->dev, "McBSP%d is currently in use\n",
406 mcbsp->id);
407 spin_unlock(&mcbsp->lock);
408 return -EBUSY;
409 }
410
411 mcbsp->free = 0;
412 spin_unlock(&mcbsp->lock);
413
414 if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->request)
415 mcbsp->pdata->ops->request(id);
416
417 clk_enable(mcbsp->iclk);
418 clk_enable(mcbsp->fclk);
419
420 /* Do procedure specific to omap34xx arch, if applicable */
421 omap34xx_mcbsp_request(mcbsp);
422
423 /*
424 * Make sure that transmitter, receiver and sample-rate generator are
425 * not running before activating IRQs.
426 */
427 OMAP_MCBSP_WRITE(mcbsp->io_base, SPCR1, 0);
428 OMAP_MCBSP_WRITE(mcbsp->io_base, SPCR2, 0);
429
430 if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) {
431 /* We need to get IRQs here */
432 init_completion(&mcbsp->tx_irq_completion);
433 err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler,
434 0, "McBSP", (void *)mcbsp);
435 if (err != 0) {
436 dev_err(mcbsp->dev, "Unable to request TX IRQ %d "
437 "for McBSP%d\n", mcbsp->tx_irq,
438 mcbsp->id);
439 goto error;
440 }
441
442 init_completion(&mcbsp->rx_irq_completion);
443 err = request_irq(mcbsp->rx_irq, omap_mcbsp_rx_irq_handler,
444 0, "McBSP", (void *)mcbsp);
445 if (err != 0) {
446 dev_err(mcbsp->dev, "Unable to request RX IRQ %d "
447 "for McBSP%d\n", mcbsp->rx_irq,
448 mcbsp->id);
449 goto tx_irq;
450 }
451 }
452
453 return 0;
454 tx_irq:
455 free_irq(mcbsp->tx_irq, (void *)mcbsp);
456 error:
457 if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
458 mcbsp->pdata->ops->free(id);
459
460 /* Do procedure specific to omap34xx arch, if applicable */
461 omap34xx_mcbsp_free(mcbsp);
462
463 clk_disable(mcbsp->fclk);
464 clk_disable(mcbsp->iclk);
465
466 mcbsp->free = 1;
467
468 return err;
469 }
470 EXPORT_SYMBOL(omap_mcbsp_request);
471
472 void omap_mcbsp_free(unsigned int id)
473 {
474 struct omap_mcbsp *mcbsp;
475
476 if (!omap_mcbsp_check_valid_id(id)) {
477 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
478 return;
479 }
480 mcbsp = id_to_mcbsp_ptr(id);
481
482 if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
483 mcbsp->pdata->ops->free(id);
484
485 /* Do procedure specific to omap34xx arch, if applicable */
486 omap34xx_mcbsp_free(mcbsp);
487
488 clk_disable(mcbsp->fclk);
489 clk_disable(mcbsp->iclk);
490
491 if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) {
492 /* Free IRQs */
493 free_irq(mcbsp->rx_irq, (void *)mcbsp);
494 free_irq(mcbsp->tx_irq, (void *)mcbsp);
495 }
496
497 spin_lock(&mcbsp->lock);
498 if (mcbsp->free) {
499 dev_err(mcbsp->dev, "McBSP%d was not reserved\n",
500 mcbsp->id);
501 spin_unlock(&mcbsp->lock);
502 return;
503 }
504
505 mcbsp->free = 1;
506 spin_unlock(&mcbsp->lock);
507 }
508 EXPORT_SYMBOL(omap_mcbsp_free);
509
510 /*
511 * Here we start the McBSP, by enabling transmitter, receiver or both.
512 * If no transmitter or receiver is active prior calling, then sample-rate
513 * generator and frame sync are started.
514 */
515 void omap_mcbsp_start(unsigned int id, int tx, int rx)
516 {
517 struct omap_mcbsp *mcbsp;
518 void __iomem *io_base;
519 int idle;
520 u16 w;
521
522 if (!omap_mcbsp_check_valid_id(id)) {
523 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
524 return;
525 }
526 mcbsp = id_to_mcbsp_ptr(id);
527 io_base = mcbsp->io_base;
528
529 mcbsp->rx_word_length = (OMAP_MCBSP_READ(io_base, RCR1) >> 5) & 0x7;
530 mcbsp->tx_word_length = (OMAP_MCBSP_READ(io_base, XCR1) >> 5) & 0x7;
531
532 idle = !((OMAP_MCBSP_READ(io_base, SPCR2) |
533 OMAP_MCBSP_READ(io_base, SPCR1)) & 1);
534
535 if (idle) {
536 /* Start the sample generator */
537 w = OMAP_MCBSP_READ(io_base, SPCR2);
538 OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 6));
539 }
540
541 /* Enable transmitter and receiver */
542 tx &= 1;
543 w = OMAP_MCBSP_READ(io_base, SPCR2);
544 OMAP_MCBSP_WRITE(io_base, SPCR2, w | tx);
545
546 rx &= 1;
547 w = OMAP_MCBSP_READ(io_base, SPCR1);
548 OMAP_MCBSP_WRITE(io_base, SPCR1, w | rx);
549
550 /*
551 * Worst case: CLKSRG*2 = 8000khz: (1/8000) * 2 * 2 usec
552 * REVISIT: 100us may give enough time for two CLKSRG, however
553 * due to some unknown PM related, clock gating etc. reason it
554 * is now at 500us.
555 */
556 udelay(500);
557
558 if (idle) {
559 /* Start frame sync */
560 w = OMAP_MCBSP_READ(io_base, SPCR2);
561 OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 7));
562 }
563
564 if (cpu_is_omap2430() || cpu_is_omap34xx()) {
565 /* Release the transmitter and receiver */
566 w = OMAP_MCBSP_READ(io_base, XCCR);
567 w &= ~(tx ? XDISABLE : 0);
568 OMAP_MCBSP_WRITE(io_base, XCCR, w);
569 w = OMAP_MCBSP_READ(io_base, RCCR);
570 w &= ~(rx ? RDISABLE : 0);
571 OMAP_MCBSP_WRITE(io_base, RCCR, w);
572 }
573
574 /* Dump McBSP Regs */
575 omap_mcbsp_dump_reg(id);
576 }
577 EXPORT_SYMBOL(omap_mcbsp_start);
578
579 void omap_mcbsp_stop(unsigned int id, int tx, int rx)
580 {
581 struct omap_mcbsp *mcbsp;
582 void __iomem *io_base;
583 int idle;
584 u16 w;
585
586 if (!omap_mcbsp_check_valid_id(id)) {
587 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
588 return;
589 }
590
591 mcbsp = id_to_mcbsp_ptr(id);
592 io_base = mcbsp->io_base;
593
594 /* Reset transmitter */
595 tx &= 1;
596 if (cpu_is_omap2430() || cpu_is_omap34xx()) {
597 w = OMAP_MCBSP_READ(io_base, XCCR);
598 w |= (tx ? XDISABLE : 0);
599 OMAP_MCBSP_WRITE(io_base, XCCR, w);
600 }
601 w = OMAP_MCBSP_READ(io_base, SPCR2);
602 OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~tx);
603
604 /* Reset receiver */
605 rx &= 1;
606 if (cpu_is_omap2430() || cpu_is_omap34xx()) {
607 w = OMAP_MCBSP_READ(io_base, RCCR);
608 w |= (rx ? RDISABLE : 0);
609 OMAP_MCBSP_WRITE(io_base, RCCR, w);
610 }
611 w = OMAP_MCBSP_READ(io_base, SPCR1);
612 OMAP_MCBSP_WRITE(io_base, SPCR1, w & ~rx);
613
614 idle = !((OMAP_MCBSP_READ(io_base, SPCR2) |
615 OMAP_MCBSP_READ(io_base, SPCR1)) & 1);
616
617 if (idle) {
618 /* Reset the sample rate generator */
619 w = OMAP_MCBSP_READ(io_base, SPCR2);
620 OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1 << 6));
621 }
622 }
623 EXPORT_SYMBOL(omap_mcbsp_stop);
624
625 /* polled mcbsp i/o operations */
626 int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
627 {
628 struct omap_mcbsp *mcbsp;
629 void __iomem *base;
630
631 if (!omap_mcbsp_check_valid_id(id)) {
632 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
633 return -ENODEV;
634 }
635
636 mcbsp = id_to_mcbsp_ptr(id);
637 base = mcbsp->io_base;
638
639 OMAP_MCBSP_WRITE(base, DXR1, buf);
640 /* if frame sync error - clear the error */
641 if (OMAP_MCBSP_READ(base, SPCR2) & XSYNC_ERR) {
642 /* clear error */
643 OMAP_MCBSP_WRITE(base, SPCR2,
644 OMAP_MCBSP_READ(base, SPCR2) & (~XSYNC_ERR));
645 /* resend */
646 return -1;
647 } else {
648 /* wait for transmit confirmation */
649 int attemps = 0;
650 while (!(OMAP_MCBSP_READ(base, SPCR2) & XRDY)) {
651 if (attemps++ > 1000) {
652 OMAP_MCBSP_WRITE(base, SPCR2,
653 OMAP_MCBSP_READ(base, SPCR2) &
654 (~XRST));
655 udelay(10);
656 OMAP_MCBSP_WRITE(base, SPCR2,
657 OMAP_MCBSP_READ(base, SPCR2) |
658 (XRST));
659 udelay(10);
660 dev_err(mcbsp->dev, "Could not write to"
661 " McBSP%d Register\n", mcbsp->id);
662 return -2;
663 }
664 }
665 }
666
667 return 0;
668 }
669 EXPORT_SYMBOL(omap_mcbsp_pollwrite);
670
671 int omap_mcbsp_pollread(unsigned int id, u16 *buf)
672 {
673 struct omap_mcbsp *mcbsp;
674 void __iomem *base;
675
676 if (!omap_mcbsp_check_valid_id(id)) {
677 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
678 return -ENODEV;
679 }
680 mcbsp = id_to_mcbsp_ptr(id);
681
682 base = mcbsp->io_base;
683 /* if frame sync error - clear the error */
684 if (OMAP_MCBSP_READ(base, SPCR1) & RSYNC_ERR) {
685 /* clear error */
686 OMAP_MCBSP_WRITE(base, SPCR1,
687 OMAP_MCBSP_READ(base, SPCR1) & (~RSYNC_ERR));
688 /* resend */
689 return -1;
690 } else {
691 /* wait for recieve confirmation */
692 int attemps = 0;
693 while (!(OMAP_MCBSP_READ(base, SPCR1) & RRDY)) {
694 if (attemps++ > 1000) {
695 OMAP_MCBSP_WRITE(base, SPCR1,
696 OMAP_MCBSP_READ(base, SPCR1) &
697 (~RRST));
698 udelay(10);
699 OMAP_MCBSP_WRITE(base, SPCR1,
700 OMAP_MCBSP_READ(base, SPCR1) |
701 (RRST));
702 udelay(10);
703 dev_err(mcbsp->dev, "Could not read from"
704 " McBSP%d Register\n", mcbsp->id);
705 return -2;
706 }
707 }
708 }
709 *buf = OMAP_MCBSP_READ(base, DRR1);
710
711 return 0;
712 }
713 EXPORT_SYMBOL(omap_mcbsp_pollread);
714
715 /*
716 * IRQ based word transmission.
717 */
718 void omap_mcbsp_xmit_word(unsigned int id, u32 word)
719 {
720 struct omap_mcbsp *mcbsp;
721 void __iomem *io_base;
722 omap_mcbsp_word_length word_length;
723
724 if (!omap_mcbsp_check_valid_id(id)) {
725 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
726 return;
727 }
728
729 mcbsp = id_to_mcbsp_ptr(id);
730 io_base = mcbsp->io_base;
731 word_length = mcbsp->tx_word_length;
732
733 wait_for_completion(&mcbsp->tx_irq_completion);
734
735 if (word_length > OMAP_MCBSP_WORD_16)
736 OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
737 OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff);
738 }
739 EXPORT_SYMBOL(omap_mcbsp_xmit_word);
740
741 u32 omap_mcbsp_recv_word(unsigned int id)
742 {
743 struct omap_mcbsp *mcbsp;
744 void __iomem *io_base;
745 u16 word_lsb, word_msb = 0;
746 omap_mcbsp_word_length word_length;
747
748 if (!omap_mcbsp_check_valid_id(id)) {
749 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
750 return -ENODEV;
751 }
752 mcbsp = id_to_mcbsp_ptr(id);
753
754 word_length = mcbsp->rx_word_length;
755 io_base = mcbsp->io_base;
756
757 wait_for_completion(&mcbsp->rx_irq_completion);
758
759 if (word_length > OMAP_MCBSP_WORD_16)
760 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
761 word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
762
763 return (word_lsb | (word_msb << 16));
764 }
765 EXPORT_SYMBOL(omap_mcbsp_recv_word);
766
767 int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
768 {
769 struct omap_mcbsp *mcbsp;
770 void __iomem *io_base;
771 omap_mcbsp_word_length tx_word_length;
772 omap_mcbsp_word_length rx_word_length;
773 u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
774
775 if (!omap_mcbsp_check_valid_id(id)) {
776 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
777 return -ENODEV;
778 }
779 mcbsp = id_to_mcbsp_ptr(id);
780 io_base = mcbsp->io_base;
781 tx_word_length = mcbsp->tx_word_length;
782 rx_word_length = mcbsp->rx_word_length;
783
784 if (tx_word_length != rx_word_length)
785 return -EINVAL;
786
787 /* First we wait for the transmitter to be ready */
788 spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
789 while (!(spcr2 & XRDY)) {
790 spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
791 if (attempts++ > 1000) {
792 /* We must reset the transmitter */
793 OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST));
794 udelay(10);
795 OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
796 udelay(10);
797 dev_err(mcbsp->dev, "McBSP%d transmitter not "
798 "ready\n", mcbsp->id);
799 return -EAGAIN;
800 }
801 }
802
803 /* Now we can push the data */
804 if (tx_word_length > OMAP_MCBSP_WORD_16)
805 OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
806 OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff);
807
808 /* We wait for the receiver to be ready */
809 spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
810 while (!(spcr1 & RRDY)) {
811 spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
812 if (attempts++ > 1000) {
813 /* We must reset the receiver */
814 OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST));
815 udelay(10);
816 OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
817 udelay(10);
818 dev_err(mcbsp->dev, "McBSP%d receiver not "
819 "ready\n", mcbsp->id);
820 return -EAGAIN;
821 }
822 }
823
824 /* Receiver is ready, let's read the dummy data */
825 if (rx_word_length > OMAP_MCBSP_WORD_16)
826 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
827 word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
828
829 return 0;
830 }
831 EXPORT_SYMBOL(omap_mcbsp_spi_master_xmit_word_poll);
832
833 int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word)
834 {
835 struct omap_mcbsp *mcbsp;
836 u32 clock_word = 0;
837 void __iomem *io_base;
838 omap_mcbsp_word_length tx_word_length;
839 omap_mcbsp_word_length rx_word_length;
840 u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
841
842 if (!omap_mcbsp_check_valid_id(id)) {
843 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
844 return -ENODEV;
845 }
846
847 mcbsp = id_to_mcbsp_ptr(id);
848 io_base = mcbsp->io_base;
849
850 tx_word_length = mcbsp->tx_word_length;
851 rx_word_length = mcbsp->rx_word_length;
852
853 if (tx_word_length != rx_word_length)
854 return -EINVAL;
855
856 /* First we wait for the transmitter to be ready */
857 spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
858 while (!(spcr2 & XRDY)) {
859 spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
860 if (attempts++ > 1000) {
861 /* We must reset the transmitter */
862 OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST));
863 udelay(10);
864 OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
865 udelay(10);
866 dev_err(mcbsp->dev, "McBSP%d transmitter not "
867 "ready\n", mcbsp->id);
868 return -EAGAIN;
869 }
870 }
871
872 /* We first need to enable the bus clock */
873 if (tx_word_length > OMAP_MCBSP_WORD_16)
874 OMAP_MCBSP_WRITE(io_base, DXR2, clock_word >> 16);
875 OMAP_MCBSP_WRITE(io_base, DXR1, clock_word & 0xffff);
876
877 /* We wait for the receiver to be ready */
878 spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
879 while (!(spcr1 & RRDY)) {
880 spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
881 if (attempts++ > 1000) {
882 /* We must reset the receiver */
883 OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST));
884 udelay(10);
885 OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
886 udelay(10);
887 dev_err(mcbsp->dev, "McBSP%d receiver not "
888 "ready\n", mcbsp->id);
889 return -EAGAIN;
890 }
891 }
892
893 /* Receiver is ready, there is something for us */
894 if (rx_word_length > OMAP_MCBSP_WORD_16)
895 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
896 word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
897
898 word[0] = (word_lsb | (word_msb << 16));
899
900 return 0;
901 }
902 EXPORT_SYMBOL(omap_mcbsp_spi_master_recv_word_poll);
903
904 /*
905 * Simple DMA based buffer rx/tx routines.
906 * Nothing fancy, just a single buffer tx/rx through DMA.
907 * The DMA resources are released once the transfer is done.
908 * For anything fancier, you should use your own customized DMA
909 * routines and callbacks.
910 */
911 int omap_mcbsp_xmit_buffer(unsigned int id, dma_addr_t buffer,
912 unsigned int length)
913 {
914 struct omap_mcbsp *mcbsp;
915 int dma_tx_ch;
916 int src_port = 0;
917 int dest_port = 0;
918 int sync_dev = 0;
919
920 if (!omap_mcbsp_check_valid_id(id)) {
921 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
922 return -ENODEV;
923 }
924 mcbsp = id_to_mcbsp_ptr(id);
925
926 if (omap_request_dma(mcbsp->dma_tx_sync, "McBSP TX",
927 omap_mcbsp_tx_dma_callback,
928 mcbsp,
929 &dma_tx_ch)) {
930 dev_err(mcbsp->dev, " Unable to request DMA channel for "
931 "McBSP%d TX. Trying IRQ based TX\n",
932 mcbsp->id);
933 return -EAGAIN;
934 }
935 mcbsp->dma_tx_lch = dma_tx_ch;
936
937 dev_err(mcbsp->dev, "McBSP%d TX DMA on channel %d\n", mcbsp->id,
938 dma_tx_ch);
939
940 init_completion(&mcbsp->tx_dma_completion);
941
942 if (cpu_class_is_omap1()) {
943 src_port = OMAP_DMA_PORT_TIPB;
944 dest_port = OMAP_DMA_PORT_EMIFF;
945 }
946 if (cpu_class_is_omap2())
947 sync_dev = mcbsp->dma_tx_sync;
948
949 omap_set_dma_transfer_params(mcbsp->dma_tx_lch,
950 OMAP_DMA_DATA_TYPE_S16,
951 length >> 1, 1,
952 OMAP_DMA_SYNC_ELEMENT,
953 sync_dev, 0);
954
955 omap_set_dma_dest_params(mcbsp->dma_tx_lch,
956 src_port,
957 OMAP_DMA_AMODE_CONSTANT,
958 mcbsp->phys_base + OMAP_MCBSP_REG_DXR1,
959 0, 0);
960
961 omap_set_dma_src_params(mcbsp->dma_tx_lch,
962 dest_port,
963 OMAP_DMA_AMODE_POST_INC,
964 buffer,
965 0, 0);
966
967 omap_start_dma(mcbsp->dma_tx_lch);
968 wait_for_completion(&mcbsp->tx_dma_completion);
969
970 return 0;
971 }
972 EXPORT_SYMBOL(omap_mcbsp_xmit_buffer);
973
974 int omap_mcbsp_recv_buffer(unsigned int id, dma_addr_t buffer,
975 unsigned int length)
976 {
977 struct omap_mcbsp *mcbsp;
978 int dma_rx_ch;
979 int src_port = 0;
980 int dest_port = 0;
981 int sync_dev = 0;
982
983 if (!omap_mcbsp_check_valid_id(id)) {
984 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
985 return -ENODEV;
986 }
987 mcbsp = id_to_mcbsp_ptr(id);
988
989 if (omap_request_dma(mcbsp->dma_rx_sync, "McBSP RX",
990 omap_mcbsp_rx_dma_callback,
991 mcbsp,
992 &dma_rx_ch)) {
993 dev_err(mcbsp->dev, "Unable to request DMA channel for "
994 "McBSP%d RX. Trying IRQ based RX\n",
995 mcbsp->id);
996 return -EAGAIN;
997 }
998 mcbsp->dma_rx_lch = dma_rx_ch;
999
1000 dev_err(mcbsp->dev, "McBSP%d RX DMA on channel %d\n", mcbsp->id,
1001 dma_rx_ch);
1002
1003 init_completion(&mcbsp->rx_dma_completion);
1004
1005 if (cpu_class_is_omap1()) {
1006 src_port = OMAP_DMA_PORT_TIPB;
1007 dest_port = OMAP_DMA_PORT_EMIFF;
1008 }
1009 if (cpu_class_is_omap2())
1010 sync_dev = mcbsp->dma_rx_sync;
1011
1012 omap_set_dma_transfer_params(mcbsp->dma_rx_lch,
1013 OMAP_DMA_DATA_TYPE_S16,
1014 length >> 1, 1,
1015 OMAP_DMA_SYNC_ELEMENT,
1016 sync_dev, 0);
1017
1018 omap_set_dma_src_params(mcbsp->dma_rx_lch,
1019 src_port,
1020 OMAP_DMA_AMODE_CONSTANT,
1021 mcbsp->phys_base + OMAP_MCBSP_REG_DRR1,
1022 0, 0);
1023
1024 omap_set_dma_dest_params(mcbsp->dma_rx_lch,
1025 dest_port,
1026 OMAP_DMA_AMODE_POST_INC,
1027 buffer,
1028 0, 0);
1029
1030 omap_start_dma(mcbsp->dma_rx_lch);
1031 wait_for_completion(&mcbsp->rx_dma_completion);
1032
1033 return 0;
1034 }
1035 EXPORT_SYMBOL(omap_mcbsp_recv_buffer);
1036
1037 /*
1038 * SPI wrapper.
1039 * Since SPI setup is much simpler than the generic McBSP one,
1040 * this wrapper just need an omap_mcbsp_spi_cfg structure as an input.
1041 * Once this is done, you can call omap_mcbsp_start().
1042 */
1043 void omap_mcbsp_set_spi_mode(unsigned int id,
1044 const struct omap_mcbsp_spi_cfg *spi_cfg)
1045 {
1046 struct omap_mcbsp *mcbsp;
1047 struct omap_mcbsp_reg_cfg mcbsp_cfg;
1048
1049 if (!omap_mcbsp_check_valid_id(id)) {
1050 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
1051 return;
1052 }
1053 mcbsp = id_to_mcbsp_ptr(id);
1054
1055 memset(&mcbsp_cfg, 0, sizeof(struct omap_mcbsp_reg_cfg));
1056
1057 /* SPI has only one frame */
1058 mcbsp_cfg.rcr1 |= (RWDLEN1(spi_cfg->word_length) | RFRLEN1(0));
1059 mcbsp_cfg.xcr1 |= (XWDLEN1(spi_cfg->word_length) | XFRLEN1(0));
1060
1061 /* Clock stop mode */
1062 if (spi_cfg->clk_stp_mode == OMAP_MCBSP_CLK_STP_MODE_NO_DELAY)
1063 mcbsp_cfg.spcr1 |= (1 << 12);
1064 else
1065 mcbsp_cfg.spcr1 |= (3 << 11);
1066
1067 /* Set clock parities */
1068 if (spi_cfg->rx_clock_polarity == OMAP_MCBSP_CLK_RISING)
1069 mcbsp_cfg.pcr0 |= CLKRP;
1070 else
1071 mcbsp_cfg.pcr0 &= ~CLKRP;
1072
1073 if (spi_cfg->tx_clock_polarity == OMAP_MCBSP_CLK_RISING)
1074 mcbsp_cfg.pcr0 &= ~CLKXP;
1075 else
1076 mcbsp_cfg.pcr0 |= CLKXP;
1077
1078 /* Set SCLKME to 0 and CLKSM to 1 */
1079 mcbsp_cfg.pcr0 &= ~SCLKME;
1080 mcbsp_cfg.srgr2 |= CLKSM;
1081
1082 /* Set FSXP */
1083 if (spi_cfg->fsx_polarity == OMAP_MCBSP_FS_ACTIVE_HIGH)
1084 mcbsp_cfg.pcr0 &= ~FSXP;
1085 else
1086 mcbsp_cfg.pcr0 |= FSXP;
1087
1088 if (spi_cfg->spi_mode == OMAP_MCBSP_SPI_MASTER) {
1089 mcbsp_cfg.pcr0 |= CLKXM;
1090 mcbsp_cfg.srgr1 |= CLKGDV(spi_cfg->clk_div - 1);
1091 mcbsp_cfg.pcr0 |= FSXM;
1092 mcbsp_cfg.srgr2 &= ~FSGM;
1093 mcbsp_cfg.xcr2 |= XDATDLY(1);
1094 mcbsp_cfg.rcr2 |= RDATDLY(1);
1095 } else {
1096 mcbsp_cfg.pcr0 &= ~CLKXM;
1097 mcbsp_cfg.srgr1 |= CLKGDV(1);
1098 mcbsp_cfg.pcr0 &= ~FSXM;
1099 mcbsp_cfg.xcr2 &= ~XDATDLY(3);
1100 mcbsp_cfg.rcr2 &= ~RDATDLY(3);
1101 }
1102
1103 mcbsp_cfg.xcr2 &= ~XPHASE;
1104 mcbsp_cfg.rcr2 &= ~RPHASE;
1105
1106 omap_mcbsp_config(id, &mcbsp_cfg);
1107 }
1108 EXPORT_SYMBOL(omap_mcbsp_set_spi_mode);
1109
1110 #ifdef CONFIG_ARCH_OMAP3
1111 #define max_thres(m) (mcbsp->pdata->buffer_size)
1112 #define valid_threshold(m, val) ((val) <= max_thres(m))
1113 #define THRESHOLD_PROP_BUILDER(prop) \
1114 static ssize_t prop##_show(struct device *dev, \
1115 struct device_attribute *attr, char *buf) \
1116 { \
1117 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev); \
1118 \
1119 return sprintf(buf, "%u\n", mcbsp->prop); \
1120 } \
1121 \
1122 static ssize_t prop##_store(struct device *dev, \
1123 struct device_attribute *attr, \
1124 const char *buf, size_t size) \
1125 { \
1126 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev); \
1127 unsigned long val; \
1128 int status; \
1129 \
1130 status = strict_strtoul(buf, 0, &val); \
1131 if (status) \
1132 return status; \
1133 \
1134 if (!valid_threshold(mcbsp, val)) \
1135 return -EDOM; \
1136 \
1137 mcbsp->prop = val; \
1138 return size; \
1139 } \
1140 \
1141 static DEVICE_ATTR(prop, 0644, prop##_show, prop##_store);
1142
1143 THRESHOLD_PROP_BUILDER(max_tx_thres);
1144 THRESHOLD_PROP_BUILDER(max_rx_thres);
1145
1146 static const char *dma_op_modes[] = {
1147 "element", "threshold", "frame",
1148 };
1149
1150 static ssize_t dma_op_mode_show(struct device *dev,
1151 struct device_attribute *attr, char *buf)
1152 {
1153 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
1154 int dma_op_mode, i = 0;
1155 ssize_t len = 0;
1156 const char * const *s;
1157
1158 dma_op_mode = mcbsp->dma_op_mode;
1159
1160 for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++) {
1161 if (dma_op_mode == i)
1162 len += sprintf(buf + len, "[%s] ", *s);
1163 else
1164 len += sprintf(buf + len, "%s ", *s);
1165 }
1166 len += sprintf(buf + len, "\n");
1167
1168 return len;
1169 }
1170
1171 static ssize_t dma_op_mode_store(struct device *dev,
1172 struct device_attribute *attr,
1173 const char *buf, size_t size)
1174 {
1175 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
1176 const char * const *s;
1177 int i = 0;
1178
1179 for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++)
1180 if (sysfs_streq(buf, *s))
1181 break;
1182
1183 if (i == ARRAY_SIZE(dma_op_modes))
1184 return -EINVAL;
1185
1186 spin_lock_irq(&mcbsp->lock);
1187 if (!mcbsp->free) {
1188 size = -EBUSY;
1189 goto unlock;
1190 }
1191 mcbsp->dma_op_mode = i;
1192
1193 unlock:
1194 spin_unlock_irq(&mcbsp->lock);
1195
1196 return size;
1197 }
1198
1199 static DEVICE_ATTR(dma_op_mode, 0644, dma_op_mode_show, dma_op_mode_store);
1200
1201 static const struct attribute *additional_attrs[] = {
1202 &dev_attr_max_tx_thres.attr,
1203 &dev_attr_max_rx_thres.attr,
1204 &dev_attr_dma_op_mode.attr,
1205 NULL,
1206 };
1207
1208 static const struct attribute_group additional_attr_group = {
1209 .attrs = (struct attribute **)additional_attrs,
1210 };
1211
1212 static inline int __devinit omap_additional_add(struct device *dev)
1213 {
1214 return sysfs_create_group(&dev->kobj, &additional_attr_group);
1215 }
1216
1217 static inline void __devexit omap_additional_remove(struct device *dev)
1218 {
1219 sysfs_remove_group(&dev->kobj, &additional_attr_group);
1220 }
1221
1222 static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp)
1223 {
1224 mcbsp->dma_op_mode = MCBSP_DMA_MODE_ELEMENT;
1225 if (cpu_is_omap34xx()) {
1226 mcbsp->max_tx_thres = max_thres(mcbsp);
1227 mcbsp->max_rx_thres = max_thres(mcbsp);
1228 /*
1229 * REVISIT: Set dmap_op_mode to THRESHOLD as default
1230 * for mcbsp2 instances.
1231 */
1232 if (omap_additional_add(mcbsp->dev))
1233 dev_warn(mcbsp->dev,
1234 "Unable to create additional controls\n");
1235 } else {
1236 mcbsp->max_tx_thres = -EINVAL;
1237 mcbsp->max_rx_thres = -EINVAL;
1238 }
1239 }
1240
1241 static inline void __devexit omap34xx_device_exit(struct omap_mcbsp *mcbsp)
1242 {
1243 if (cpu_is_omap34xx())
1244 omap_additional_remove(mcbsp->dev);
1245 }
1246 #else
1247 static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp) {}
1248 static inline void __devexit omap34xx_device_exit(struct omap_mcbsp *mcbsp) {}
1249 #endif /* CONFIG_ARCH_OMAP3 */
1250
1251 /*
1252 * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
1253 * 730 has only 2 McBSP, and both of them are MPU peripherals.
1254 */
1255 static int __devinit omap_mcbsp_probe(struct platform_device *pdev)
1256 {
1257 struct omap_mcbsp_platform_data *pdata = pdev->dev.platform_data;
1258 struct omap_mcbsp *mcbsp;
1259 int id = pdev->id - 1;
1260 int ret = 0;
1261
1262 if (!pdata) {
1263 dev_err(&pdev->dev, "McBSP device initialized without"
1264 "platform data\n");
1265 ret = -EINVAL;
1266 goto exit;
1267 }
1268
1269 dev_dbg(&pdev->dev, "Initializing OMAP McBSP (%d).\n", pdev->id);
1270
1271 if (id >= omap_mcbsp_count) {
1272 dev_err(&pdev->dev, "Invalid McBSP device id (%d)\n", id);
1273 ret = -EINVAL;
1274 goto exit;
1275 }
1276
1277 mcbsp = kzalloc(sizeof(struct omap_mcbsp), GFP_KERNEL);
1278 if (!mcbsp) {
1279 ret = -ENOMEM;
1280 goto exit;
1281 }
1282
1283 spin_lock_init(&mcbsp->lock);
1284 mcbsp->id = id + 1;
1285 mcbsp->free = 1;
1286 mcbsp->dma_tx_lch = -1;
1287 mcbsp->dma_rx_lch = -1;
1288
1289 mcbsp->phys_base = pdata->phys_base;
1290 mcbsp->io_base = ioremap(pdata->phys_base, SZ_4K);
1291 if (!mcbsp->io_base) {
1292 ret = -ENOMEM;
1293 goto err_ioremap;
1294 }
1295
1296 /* Default I/O is IRQ based */
1297 mcbsp->io_type = OMAP_MCBSP_IRQ_IO;
1298 mcbsp->tx_irq = pdata->tx_irq;
1299 mcbsp->rx_irq = pdata->rx_irq;
1300 mcbsp->dma_rx_sync = pdata->dma_rx_sync;
1301 mcbsp->dma_tx_sync = pdata->dma_tx_sync;
1302
1303 mcbsp->iclk = clk_get(&pdev->dev, "ick");
1304 if (IS_ERR(mcbsp->iclk)) {
1305 ret = PTR_ERR(mcbsp->iclk);
1306 dev_err(&pdev->dev, "unable to get ick: %d\n", ret);
1307 goto err_iclk;
1308 }
1309
1310 mcbsp->fclk = clk_get(&pdev->dev, "fck");
1311 if (IS_ERR(mcbsp->fclk)) {
1312 ret = PTR_ERR(mcbsp->fclk);
1313 dev_err(&pdev->dev, "unable to get fck: %d\n", ret);
1314 goto err_fclk;
1315 }
1316
1317 mcbsp->pdata = pdata;
1318 mcbsp->dev = &pdev->dev;
1319 mcbsp_ptr[id] = mcbsp;
1320 platform_set_drvdata(pdev, mcbsp);
1321
1322 /* Initialize mcbsp properties for OMAP34XX if needed / applicable */
1323 omap34xx_device_init(mcbsp);
1324
1325 return 0;
1326
1327 err_fclk:
1328 clk_put(mcbsp->iclk);
1329 err_iclk:
1330 iounmap(mcbsp->io_base);
1331 err_ioremap:
1332 kfree(mcbsp);
1333 exit:
1334 return ret;
1335 }
1336
1337 static int __devexit omap_mcbsp_remove(struct platform_device *pdev)
1338 {
1339 struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
1340
1341 platform_set_drvdata(pdev, NULL);
1342 if (mcbsp) {
1343
1344 if (mcbsp->pdata && mcbsp->pdata->ops &&
1345 mcbsp->pdata->ops->free)
1346 mcbsp->pdata->ops->free(mcbsp->id);
1347
1348 omap34xx_device_exit(mcbsp);
1349
1350 clk_disable(mcbsp->fclk);
1351 clk_disable(mcbsp->iclk);
1352 clk_put(mcbsp->fclk);
1353 clk_put(mcbsp->iclk);
1354
1355 iounmap(mcbsp->io_base);
1356
1357 mcbsp->fclk = NULL;
1358 mcbsp->iclk = NULL;
1359 mcbsp->free = 0;
1360 mcbsp->dev = NULL;
1361 }
1362
1363 return 0;
1364 }
1365
1366 static struct platform_driver omap_mcbsp_driver = {
1367 .probe = omap_mcbsp_probe,
1368 .remove = __devexit_p(omap_mcbsp_remove),
1369 .driver = {
1370 .name = "omap-mcbsp",
1371 },
1372 };
1373
1374 int __init omap_mcbsp_init(void)
1375 {
1376 /* Register the McBSP driver */
1377 return platform_driver_register(&omap_mcbsp_driver);
1378 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree