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Add linux-next specific files for 20110525
[linux-2.6/next.git] / sound / soc / s6000 / s6000-i2s.c
blob3052f64b2403929a62fec3c8257aedec40c8a7a2
1 /*
2 * ALSA SoC I2S Audio Layer for the Stretch S6000 family
3 *
4 * Author: Daniel Gloeckner, <dg@emlix.com>
5 * Copyright: (C) 2009 emlix GmbH <info@emlix.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/device.h>
15 #include <linux/delay.h>
16 #include <linux/clk.h>
17 #include <linux/interrupt.h>
18 #include <linux/io.h>
19 #include <linux/slab.h>
20
21 #include <sound/core.h>
22 #include <sound/pcm.h>
23 #include <sound/pcm_params.h>
24 #include <sound/initval.h>
25 #include <sound/soc.h>
26
27 #include "s6000-i2s.h"
28 #include "s6000-pcm.h"
29
30 struct s6000_i2s_dev {
31 dma_addr_t sifbase;
32 u8 __iomem *scbbase;
33 unsigned int wide;
34 unsigned int channel_in;
35 unsigned int channel_out;
36 unsigned int lines_in;
37 unsigned int lines_out;
38 struct s6000_pcm_dma_params dma_params;
39 };
40
41 #define S6_I2S_INTERRUPT_STATUS 0x00
42 #define S6_I2S_INT_OVERRUN 1
43 #define S6_I2S_INT_UNDERRUN 2
44 #define S6_I2S_INT_ALIGNMENT 4
45 #define S6_I2S_INTERRUPT_ENABLE 0x04
46 #define S6_I2S_INTERRUPT_RAW 0x08
47 #define S6_I2S_INTERRUPT_CLEAR 0x0C
48 #define S6_I2S_INTERRUPT_SET 0x10
49 #define S6_I2S_MODE 0x20
50 #define S6_I2S_DUAL 0
51 #define S6_I2S_WIDE 1
52 #define S6_I2S_TX_DEFAULT 0x24
53 #define S6_I2S_DATA_CFG(c) (0x40 + 0x10 * (c))
54 #define S6_I2S_IN 0
55 #define S6_I2S_OUT 1
56 #define S6_I2S_UNUSED 2
57 #define S6_I2S_INTERFACE_CFG(c) (0x44 + 0x10 * (c))
58 #define S6_I2S_DIV_MASK 0x001fff
59 #define S6_I2S_16BIT 0x000000
60 #define S6_I2S_20BIT 0x002000
61 #define S6_I2S_24BIT 0x004000
62 #define S6_I2S_32BIT 0x006000
63 #define S6_I2S_BITS_MASK 0x006000
64 #define S6_I2S_MEM_16BIT 0x000000
65 #define S6_I2S_MEM_32BIT 0x008000
66 #define S6_I2S_MEM_MASK 0x008000
67 #define S6_I2S_CHANNELS_SHIFT 16
68 #define S6_I2S_CHANNELS_MASK 0x030000
69 #define S6_I2S_SCK_IN 0x000000
70 #define S6_I2S_SCK_OUT 0x040000
71 #define S6_I2S_SCK_DIR 0x040000
72 #define S6_I2S_WS_IN 0x000000
73 #define S6_I2S_WS_OUT 0x080000
74 #define S6_I2S_WS_DIR 0x080000
75 #define S6_I2S_LEFT_FIRST 0x000000
76 #define S6_I2S_RIGHT_FIRST 0x100000
77 #define S6_I2S_FIRST 0x100000
78 #define S6_I2S_CUR_SCK 0x200000
79 #define S6_I2S_CUR_WS 0x400000
80 #define S6_I2S_ENABLE(c) (0x48 + 0x10 * (c))
81 #define S6_I2S_DISABLE_IF 0x02
82 #define S6_I2S_ENABLE_IF 0x03
83 #define S6_I2S_IS_BUSY 0x04
84 #define S6_I2S_DMA_ACTIVE 0x08
85 #define S6_I2S_IS_ENABLED 0x10
86
87 #define S6_I2S_NUM_LINES 4
88
89 #define S6_I2S_SIF_PORT0 0x0000000
90 #define S6_I2S_SIF_PORT1 0x0000080 /* docs say 0x0000010 */
91
92 static inline void s6_i2s_write_reg(struct s6000_i2s_dev *dev, int reg, u32 val)
93 {
94 writel(val, dev->scbbase + reg);
95 }
96
97 static inline u32 s6_i2s_read_reg(struct s6000_i2s_dev *dev, int reg)
98 {
99 return readl(dev->scbbase + reg);
100 }
101
102 static inline void s6_i2s_mod_reg(struct s6000_i2s_dev *dev, int reg,
103 u32 mask, u32 val)
104 {
105 val ^= s6_i2s_read_reg(dev, reg) & ~mask;
106 s6_i2s_write_reg(dev, reg, val);
107 }
108
109 static void s6000_i2s_start_channel(struct s6000_i2s_dev *dev, int channel)
110 {
111 int i, j, cur, prev;
112
113 /*
114 * Wait for WCLK to toggle 5 times before enabling the channel
115 * s6000 Family Datasheet 3.6.4:
116 * "At least two cycles of WS must occur between commands
117 * to disable or enable the interface"
118 */
119 j = 0;
120 prev = ~S6_I2S_CUR_WS;
121 for (i = 1000000; --i && j < 6; ) {
122 cur = s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(channel))
123 & S6_I2S_CUR_WS;
124 if (prev != cur) {
125 prev = cur;
126 j++;
127 }
128 }
129 if (j < 6)
130 printk(KERN_WARNING "s6000-i2s: timeout waiting for WCLK\n");
131
132 s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_ENABLE_IF);
133 }
134
135 static void s6000_i2s_stop_channel(struct s6000_i2s_dev *dev, int channel)
136 {
137 s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_DISABLE_IF);
138 }
139
140 static void s6000_i2s_start(struct snd_pcm_substream *substream)
141 {
142 struct snd_soc_pcm_runtime *rtd = substream->private_data;
143 struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(rtd->cpu_dai);
144 int channel;
145
146 channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
147 dev->channel_out : dev->channel_in;
148
149 s6000_i2s_start_channel(dev, channel);
150 }
151
152 static void s6000_i2s_stop(struct snd_pcm_substream *substream)
153 {
154 struct snd_soc_pcm_runtime *rtd = substream->private_data;
155 struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(rtd->cpu_dai);
156 int channel;
157
158 channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
159 dev->channel_out : dev->channel_in;
160
161 s6000_i2s_stop_channel(dev, channel);
162 }
163
164 static int s6000_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
165 int after)
166 {
167 switch (cmd) {
168 case SNDRV_PCM_TRIGGER_START:
169 case SNDRV_PCM_TRIGGER_RESUME:
170 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
171 if ((substream->stream == SNDRV_PCM_STREAM_CAPTURE) ^ !after)
172 s6000_i2s_start(substream);
173 break;
174 case SNDRV_PCM_TRIGGER_STOP:
175 case SNDRV_PCM_TRIGGER_SUSPEND:
176 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
177 if (!after)
178 s6000_i2s_stop(substream);
179 }
180 return 0;
181 }
182
183 static unsigned int s6000_i2s_int_sources(struct s6000_i2s_dev *dev)
184 {
185 unsigned int pending;
186 pending = s6_i2s_read_reg(dev, S6_I2S_INTERRUPT_RAW);
187 pending &= S6_I2S_INT_ALIGNMENT |
188 S6_I2S_INT_UNDERRUN |
189 S6_I2S_INT_OVERRUN;
190 s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR, pending);
191
192 return pending;
193 }
194
195 static unsigned int s6000_i2s_check_xrun(struct snd_soc_dai *cpu_dai)
196 {
197 struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
198 unsigned int errors;
199 unsigned int ret;
200
201 errors = s6000_i2s_int_sources(dev);
202 if (likely(!errors))
203 return 0;
204
205 ret = 0;
206 if (errors & S6_I2S_INT_ALIGNMENT)
207 printk(KERN_ERR "s6000-i2s: WCLK misaligned\n");
208 if (errors & S6_I2S_INT_UNDERRUN)
209 ret |= 1 << SNDRV_PCM_STREAM_PLAYBACK;
210 if (errors & S6_I2S_INT_OVERRUN)
211 ret |= 1 << SNDRV_PCM_STREAM_CAPTURE;
212 return ret;
213 }
214
215 static void s6000_i2s_wait_disabled(struct s6000_i2s_dev *dev)
216 {
217 int channel;
218 int n = 50;
219 for (channel = 0; channel < 2; channel++) {
220 while (--n >= 0) {
221 int v = s6_i2s_read_reg(dev, S6_I2S_ENABLE(channel));
222 if ((v & S6_I2S_IS_ENABLED)
223 || !(v & (S6_I2S_DMA_ACTIVE | S6_I2S_IS_BUSY)))
224 break;
225 udelay(20);
226 }
227 }
228 if (n < 0)
229 printk(KERN_WARNING "s6000-i2s: timeout disabling interfaces");
230 }
231
232 static int s6000_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
233 unsigned int fmt)
234 {
235 struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
236 u32 w;
237
238 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
239 case SND_SOC_DAIFMT_CBM_CFM:
240 w = S6_I2S_SCK_IN | S6_I2S_WS_IN;
241 break;
242 case SND_SOC_DAIFMT_CBS_CFM:
243 w = S6_I2S_SCK_OUT | S6_I2S_WS_IN;
244 break;
245 case SND_SOC_DAIFMT_CBM_CFS:
246 w = S6_I2S_SCK_IN | S6_I2S_WS_OUT;
247 break;
248 case SND_SOC_DAIFMT_CBS_CFS:
249 w = S6_I2S_SCK_OUT | S6_I2S_WS_OUT;
250 break;
251 default:
252 return -EINVAL;
253 }
254
255 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
256 case SND_SOC_DAIFMT_NB_NF:
257 w |= S6_I2S_LEFT_FIRST;
258 break;
259 case SND_SOC_DAIFMT_NB_IF:
260 w |= S6_I2S_RIGHT_FIRST;
261 break;
262 default:
263 return -EINVAL;
264 }
265
266 s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(0),
267 S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
268 s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(1),
269 S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
270
271 return 0;
272 }
273
274 static int s6000_i2s_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div)
275 {
276 struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
277
278 if (!div || (div & 1) || div > (S6_I2S_DIV_MASK + 1) * 2)
279 return -EINVAL;
280
281 s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(div_id),
282 S6_I2S_DIV_MASK, div / 2 - 1);
283 return 0;
284 }
285
286 static int s6000_i2s_hw_params(struct snd_pcm_substream *substream,
287 struct snd_pcm_hw_params *params,
288 struct snd_soc_dai *dai)
289 {
290 struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
291 int interf;
292 u32 w = 0;
293
294 if (dev->wide)
295 interf = 0;
296 else {
297 w |= (((params_channels(params) - 2) / 2)
298 << S6_I2S_CHANNELS_SHIFT) & S6_I2S_CHANNELS_MASK;
299 interf = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
300 ? dev->channel_out : dev->channel_in;
301 }
302
303 switch (params_format(params)) {
304 case SNDRV_PCM_FORMAT_S16_LE:
305 w |= S6_I2S_16BIT | S6_I2S_MEM_16BIT;
306 break;
307 case SNDRV_PCM_FORMAT_S32_LE:
308 w |= S6_I2S_32BIT | S6_I2S_MEM_32BIT;
309 break;
310 default:
311 printk(KERN_WARNING "s6000-i2s: unsupported PCM format %x\n",
312 params_format(params));
313 return -EINVAL;
314 }
315
316 if (s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(interf))
317 & S6_I2S_IS_ENABLED) {
318 printk(KERN_ERR "s6000-i2s: interface already enabled\n");
319 return -EBUSY;
320 }
321
322 s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(interf),
323 S6_I2S_CHANNELS_MASK|S6_I2S_MEM_MASK|S6_I2S_BITS_MASK,
324 w);
325
326 return 0;
327 }
328
329 static int s6000_i2s_dai_probe(struct snd_soc_dai *dai)
330 {
331 struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
332 struct s6000_snd_platform_data *pdata = dai->dev->platform_data;
333
334 if (!pdata)
335 return -EINVAL;
336
337 dai->capture_dma_data = &dev->dma_params;
338 dai->playback_dma_data = &dev->dma_params;
339
340 dev->wide = pdata->wide;
341 dev->channel_in = pdata->channel_in;
342 dev->channel_out = pdata->channel_out;
343 dev->lines_in = pdata->lines_in;
344 dev->lines_out = pdata->lines_out;
345
346 s6_i2s_write_reg(dev, S6_I2S_MODE,
347 dev->wide ? S6_I2S_WIDE : S6_I2S_DUAL);
348
349 if (dev->wide) {
350 int i;
351
352 if (dev->lines_in + dev->lines_out > S6_I2S_NUM_LINES)
353 return -EINVAL;
354
355 dev->channel_in = 0;
356 dev->channel_out = 1;
357 dai->driver->capture.channels_min = 2 * dev->lines_in;
358 dai->driver->capture.channels_max = dai->driver->capture.channels_min;
359 dai->driver->playback.channels_min = 2 * dev->lines_out;
360 dai->driver->playback.channels_max = dai->driver->playback.channels_min;
361
362 for (i = 0; i < dev->lines_out; i++)
363 s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_OUT);
364
365 for (; i < S6_I2S_NUM_LINES - dev->lines_in; i++)
366 s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i),
367 S6_I2S_UNUSED);
368
369 for (; i < S6_I2S_NUM_LINES; i++)
370 s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_IN);
371 } else {
372 unsigned int cfg[2] = {S6_I2S_UNUSED, S6_I2S_UNUSED};
373
374 if (dev->lines_in > 1 || dev->lines_out > 1)
375 return -EINVAL;
376
377 dai->driver->capture.channels_min = 2 * dev->lines_in;
378 dai->driver->capture.channels_max = 8 * dev->lines_in;
379 dai->driver->playback.channels_min = 2 * dev->lines_out;
380 dai->driver->playback.channels_max = 8 * dev->lines_out;
381
382 if (dev->lines_in)
383 cfg[dev->channel_in] = S6_I2S_IN;
384 if (dev->lines_out)
385 cfg[dev->channel_out] = S6_I2S_OUT;
386
387 s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(0), cfg[0]);
388 s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(1), cfg[1]);
389 }
390
391 if (dev->lines_out) {
392 if (dev->lines_in) {
393 if (!dev->dma_params.dma_out)
394 return -ENODEV;
395 } else {
396 dev->dma_params.dma_out = dev->dma_params.dma_in;
397 dev->dma_params.dma_in = 0;
398 }
399 }
400 dev->dma_params.sif_in = dev->sifbase + (dev->channel_in ?
401 S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
402 dev->dma_params.sif_out = dev->sifbase + (dev->channel_out ?
403 S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
404 dev->dma_params.same_rate = pdata->same_rate | pdata->wide;
405 return 0;
406 }
407
408 #define S6000_I2S_RATES (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
409 SNDRV_PCM_RATE_8000_192000)
410 #define S6000_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
411
412 static struct snd_soc_dai_ops s6000_i2s_dai_ops = {
413 .set_fmt = s6000_i2s_set_dai_fmt,
414 .set_clkdiv = s6000_i2s_set_clkdiv,
415 .hw_params = s6000_i2s_hw_params,
416 };
417
418 static struct snd_soc_dai_driver s6000_i2s_dai = {
419 .probe = s6000_i2s_dai_probe,
420 .playback = {
421 .channels_min = 2,
422 .channels_max = 8,
423 .formats = S6000_I2S_FORMATS,
424 .rates = S6000_I2S_RATES,
425 .rate_min = 0,
426 .rate_max = 1562500,
427 },
428 .capture = {
429 .channels_min = 2,
430 .channels_max = 8,
431 .formats = S6000_I2S_FORMATS,
432 .rates = S6000_I2S_RATES,
433 .rate_min = 0,
434 .rate_max = 1562500,
435 },
436 .ops = &s6000_i2s_dai_ops,
437 };
438
439 static int __devinit s6000_i2s_probe(struct platform_device *pdev)
440 {
441 struct s6000_i2s_dev *dev;
442 struct resource *scbmem, *sifmem, *region, *dma1, *dma2;
443 u8 __iomem *mmio;
444 int ret;
445
446 scbmem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
447 if (!scbmem) {
448 dev_err(&pdev->dev, "no mem resource?\n");
449 ret = -ENODEV;
450 goto err_release_none;
451 }
452
453 region = request_mem_region(scbmem->start, resource_size(scbmem),
454 pdev->name);
455 if (!region) {
456 dev_err(&pdev->dev, "I2S SCB region already claimed\n");
457 ret = -EBUSY;
458 goto err_release_none;
459 }
460
461 mmio = ioremap(scbmem->start, resource_size(scbmem));
462 if (!mmio) {
463 dev_err(&pdev->dev, "can't ioremap SCB region\n");
464 ret = -ENOMEM;
465 goto err_release_scb;
466 }
467
468 sifmem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
469 if (!sifmem) {
470 dev_err(&pdev->dev, "no second mem resource?\n");
471 ret = -ENODEV;
472 goto err_release_map;
473 }
474
475 region = request_mem_region(sifmem->start, resource_size(sifmem),
476 pdev->name);
477 if (!region) {
478 dev_err(&pdev->dev, "I2S SIF region already claimed\n");
479 ret = -EBUSY;
480 goto err_release_map;
481 }
482
483 dma1 = platform_get_resource(pdev, IORESOURCE_DMA, 0);
484 if (!dma1) {
485 dev_err(&pdev->dev, "no dma resource?\n");
486 ret = -ENODEV;
487 goto err_release_sif;
488 }
489
490 region = request_mem_region(dma1->start, resource_size(dma1),
491 pdev->name);
492 if (!region) {
493 dev_err(&pdev->dev, "I2S DMA region already claimed\n");
494 ret = -EBUSY;
495 goto err_release_sif;
496 }
497
498 dma2 = platform_get_resource(pdev, IORESOURCE_DMA, 1);
499 if (dma2) {
500 region = request_mem_region(dma2->start, resource_size(dma2),
501 pdev->name);
502 if (!region) {
503 dev_err(&pdev->dev,
504 "I2S DMA region already claimed\n");
505 ret = -EBUSY;
506 goto err_release_dma1;
507 }
508 }
509
510 dev = kzalloc(sizeof(struct s6000_i2s_dev), GFP_KERNEL);
511 if (!dev) {
512 ret = -ENOMEM;
513 goto err_release_dma2;
514 }
515 dev_set_drvdata(&pdev->dev, dev);
516
517 dev->sifbase = sifmem->start;
518 dev->scbbase = mmio;
519
520 s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
521 s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR,
522 S6_I2S_INT_ALIGNMENT |
523 S6_I2S_INT_UNDERRUN |
524 S6_I2S_INT_OVERRUN);
525
526 s6000_i2s_stop_channel(dev, 0);
527 s6000_i2s_stop_channel(dev, 1);
528 s6000_i2s_wait_disabled(dev);
529
530 dev->dma_params.check_xrun = s6000_i2s_check_xrun;
531 dev->dma_params.trigger = s6000_i2s_trigger;
532 dev->dma_params.dma_in = dma1->start;
533 dev->dma_params.dma_out = dma2 ? dma2->start : 0;
534 dev->dma_params.irq = platform_get_irq(pdev, 0);
535 if (dev->dma_params.irq < 0) {
536 dev_err(&pdev->dev, "no irq resource?\n");
537 ret = -ENODEV;
538 goto err_release_dev;
539 }
540
541 s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE,
542 S6_I2S_INT_ALIGNMENT |
543 S6_I2S_INT_UNDERRUN |
544 S6_I2S_INT_OVERRUN);
545
546 ret = snd_soc_register_dai(&pdev->dev, &s6000_i2s_dai);
547 if (ret)
548 goto err_release_dev;
549
550 return 0;
551
552 err_release_dev:
553 kfree(dev);
554 err_release_dma2:
555 if (dma2)
556 release_mem_region(dma2->start, resource_size(dma2));
557 err_release_dma1:
558 release_mem_region(dma1->start, resource_size(dma1));
559 err_release_sif:
560 release_mem_region(sifmem->start, resource_size(sifmem));
561 err_release_map:
562 iounmap(mmio);
563 err_release_scb:
564 release_mem_region(scbmem->start, resource_size(scbmem));
565 err_release_none:
566 return ret;
567 }
568
569 static void __devexit s6000_i2s_remove(struct platform_device *pdev)
570 {
571 struct s6000_i2s_dev *dev = dev_get_drvdata(&pdev->dev);
572 struct resource *region;
573 void __iomem *mmio = dev->scbbase;
574
575 snd_soc_unregister_dai(&pdev->dev);
576
577 s6000_i2s_stop_channel(dev, 0);
578 s6000_i2s_stop_channel(dev, 1);
579
580 s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
581 kfree(dev);
582
583 region = platform_get_resource(pdev, IORESOURCE_DMA, 0);
584 release_mem_region(region->start, resource_size(region));
585
586 region = platform_get_resource(pdev, IORESOURCE_DMA, 1);
587 if (region)
588 release_mem_region(region->start, resource_size(region));
589
590 region = platform_get_resource(pdev, IORESOURCE_MEM, 0);
591 release_mem_region(region->start, resource_size(region));
592
593 iounmap(mmio);
594 region = platform_get_resource(pdev, IORESOURCE_IO, 0);
595 release_mem_region(region->start, resource_size(region));
596 }
597
598 static struct platform_driver s6000_i2s_driver = {
599 .probe = s6000_i2s_probe,
600 .remove = __devexit_p(s6000_i2s_remove),
601 .driver = {
602 .name = "s6000-i2s",
603 .owner = THIS_MODULE,
604 },
605 };
606
607 static int __init s6000_i2s_init(void)
608 {
609 return platform_driver_register(&s6000_i2s_driver);
610 }
611 module_init(s6000_i2s_init);
612
613 static void __exit s6000_i2s_exit(void)
614 {
615 platform_driver_unregister(&s6000_i2s_driver);
616 }
617 module_exit(s6000_i2s_exit);
618
619 MODULE_AUTHOR("Daniel Gloeckner");
620 MODULE_DESCRIPTION("Stretch s6000 family I2S SoC Interface");
621 MODULE_LICENSE("GPL");
linux-next