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ASoC: kirkwood-dma: remove restriction on sample rates
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / soc / kirkwood / kirkwood-dma.c
1 /*
2 * kirkwood-dma.c
3 *
4 * (c) 2010 Arnaud Patard <apatard@mandriva.com>
5 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/io.h>
17 #include <linux/slab.h>
18 #include <linux/interrupt.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/mbus.h>
21 #include <sound/soc.h>
22 #include "kirkwood.h"
23
24 #define KIRKWOOD_RATES \
25 (SNDRV_PCM_RATE_8000_192000 | \
26 SNDRV_PCM_RATE_CONTINUOUS | \
27 SNDRV_PCM_RATE_KNOT)
28
29 #define KIRKWOOD_FORMATS \
30 (SNDRV_PCM_FMTBIT_S16_LE | \
31 SNDRV_PCM_FMTBIT_S24_LE | \
32 SNDRV_PCM_FMTBIT_S32_LE)
33
34 struct kirkwood_dma_priv {
35 struct snd_pcm_substream *play_stream;
36 struct snd_pcm_substream *rec_stream;
37 struct kirkwood_dma_data *data;
38 };
39
40 static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
41 .info = (SNDRV_PCM_INFO_INTERLEAVED |
42 SNDRV_PCM_INFO_MMAP |
43 SNDRV_PCM_INFO_MMAP_VALID |
44 SNDRV_PCM_INFO_BLOCK_TRANSFER |
45 SNDRV_PCM_INFO_PAUSE),
46 .formats = KIRKWOOD_FORMATS,
47 .rates = KIRKWOOD_RATES,
48 .rate_min = 8000,
49 .rate_max = 384000,
50 .channels_min = 1,
51 .channels_max = 2,
52 .buffer_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS,
53 .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
54 .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
55 .periods_min = KIRKWOOD_SND_MIN_PERIODS,
56 .periods_max = KIRKWOOD_SND_MAX_PERIODS,
57 .fifo_size = 0,
58 };
59
60 static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32);
61
62 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
63 {
64 struct kirkwood_dma_priv *prdata = dev_id;
65 struct kirkwood_dma_data *priv = prdata->data;
66 unsigned long mask, status, cause;
67
68 mask = readl(priv->io + KIRKWOOD_INT_MASK);
69 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
70
71 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
72 if (unlikely(cause)) {
73 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
74 __func__, cause);
75 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
76 }
77
78 /* we've enabled only bytes interrupts ... */
79 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
80 KIRKWOOD_INT_CAUSE_REC_BYTES)) {
81 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
82 __func__, status);
83 return IRQ_NONE;
84 }
85
86 /* ack int */
87 writel(status, priv->io + KIRKWOOD_INT_CAUSE);
88
89 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
90 snd_pcm_period_elapsed(prdata->play_stream);
91
92 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
93 snd_pcm_period_elapsed(prdata->rec_stream);
94
95 return IRQ_HANDLED;
96 }
97
98 static void
99 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
100 unsigned long dma,
101 const struct mbus_dram_target_info *dram)
102 {
103 int i;
104
105 /* First disable and clear windows */
106 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
107 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
108
109 /* try to find matching cs for current dma address */
110 for (i = 0; i < dram->num_cs; i++) {
111 const struct mbus_dram_window *cs = dram->cs + i;
112 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
113 writel(cs->base & 0xffff0000,
114 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
115 writel(((cs->size - 1) & 0xffff0000) |
116 (cs->mbus_attr << 8) |
117 (dram->mbus_dram_target_id << 4) | 1,
118 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
119 }
120 }
121 }
122
123 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
124 {
125 int err;
126 struct snd_pcm_runtime *runtime = substream->runtime;
127 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
128 struct snd_soc_platform *platform = soc_runtime->platform;
129 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
130 struct kirkwood_dma_data *priv;
131 struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
132 const struct mbus_dram_target_info *dram;
133 unsigned long addr;
134
135 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
136 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
137
138 /* Ensure that all constraints linked to dma burst are fulfilled */
139 err = snd_pcm_hw_constraint_minmax(runtime,
140 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
141 priv->burst * 2,
142 KIRKWOOD_AUDIO_BUF_MAX-1);
143 if (err < 0)
144 return err;
145
146 err = snd_pcm_hw_constraint_step(runtime, 0,
147 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
148 priv->burst);
149 if (err < 0)
150 return err;
151
152 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
153 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
154 priv->burst);
155 if (err < 0)
156 return err;
157
158 if (prdata == NULL) {
159 prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
160 if (prdata == NULL)
161 return -ENOMEM;
162
163 prdata->data = priv;
164
165 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
166 "kirkwood-i2s", prdata);
167 if (err) {
168 kfree(prdata);
169 return -EBUSY;
170 }
171
172 snd_soc_platform_set_drvdata(platform, prdata);
173
174 /*
175 * Enable Error interrupts. We're only ack'ing them but
176 * it's useful for diagnostics
177 */
178 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
179 }
180
181 dram = mv_mbus_dram_info();
182 addr = substream->dma_buffer.addr;
183 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
184 prdata->play_stream = substream;
185 kirkwood_dma_conf_mbus_windows(priv->io,
186 KIRKWOOD_PLAYBACK_WIN, addr, dram);
187 } else {
188 prdata->rec_stream = substream;
189 kirkwood_dma_conf_mbus_windows(priv->io,
190 KIRKWOOD_RECORD_WIN, addr, dram);
191 }
192
193 return 0;
194 }
195
196 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
197 {
198 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
199 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
200 struct snd_soc_platform *platform = soc_runtime->platform;
201 struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
202 struct kirkwood_dma_data *priv;
203
204 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
205
206 if (!prdata || !priv)
207 return 0;
208
209 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
210 prdata->play_stream = NULL;
211 else
212 prdata->rec_stream = NULL;
213
214 if (!prdata->play_stream && !prdata->rec_stream) {
215 writel(0, priv->io + KIRKWOOD_ERR_MASK);
216 free_irq(priv->irq, prdata);
217 kfree(prdata);
218 snd_soc_platform_set_drvdata(platform, NULL);
219 }
220
221 return 0;
222 }
223
224 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
225 struct snd_pcm_hw_params *params)
226 {
227 struct snd_pcm_runtime *runtime = substream->runtime;
228
229 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
230 runtime->dma_bytes = params_buffer_bytes(params);
231
232 return 0;
233 }
234
235 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
236 {
237 snd_pcm_set_runtime_buffer(substream, NULL);
238 return 0;
239 }
240
241 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
242 {
243 struct snd_pcm_runtime *runtime = substream->runtime;
244 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
245 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
246 struct kirkwood_dma_data *priv;
247 unsigned long size, count;
248
249 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
250
251 /* compute buffer size in term of "words" as requested in specs */
252 size = frames_to_bytes(runtime, runtime->buffer_size);
253 size = (size>>2)-1;
254 count = snd_pcm_lib_period_bytes(substream);
255
256 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
257 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
258 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
259 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
260 } else {
261 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
262 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
263 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
264 }
265
266
267 return 0;
268 }
269
270 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
271 *substream)
272 {
273 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
274 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
275 struct kirkwood_dma_data *priv;
276 snd_pcm_uframes_t count;
277
278 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
279
280 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
281 count = bytes_to_frames(substream->runtime,
282 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
283 else
284 count = bytes_to_frames(substream->runtime,
285 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
286
287 return count;
288 }
289
290 struct snd_pcm_ops kirkwood_dma_ops = {
291 .open = kirkwood_dma_open,
292 .close = kirkwood_dma_close,
293 .ioctl = snd_pcm_lib_ioctl,
294 .hw_params = kirkwood_dma_hw_params,
295 .hw_free = kirkwood_dma_hw_free,
296 .prepare = kirkwood_dma_prepare,
297 .pointer = kirkwood_dma_pointer,
298 };
299
300 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
301 int stream)
302 {
303 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
304 struct snd_dma_buffer *buf = &substream->dma_buffer;
305 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
306
307 buf->dev.type = SNDRV_DMA_TYPE_DEV;
308 buf->dev.dev = pcm->card->dev;
309 buf->area = dma_alloc_coherent(pcm->card->dev, size,
310 &buf->addr, GFP_KERNEL);
311 if (!buf->area)
312 return -ENOMEM;
313 buf->bytes = size;
314 buf->private_data = NULL;
315
316 return 0;
317 }
318
319 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
320 {
321 struct snd_card *card = rtd->card->snd_card;
322 struct snd_pcm *pcm = rtd->pcm;
323 int ret;
324
325 if (!card->dev->dma_mask)
326 card->dev->dma_mask = &kirkwood_dma_dmamask;
327 if (!card->dev->coherent_dma_mask)
328 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
329
330 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
331 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
332 SNDRV_PCM_STREAM_PLAYBACK);
333 if (ret)
334 return ret;
335 }
336
337 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
338 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
339 SNDRV_PCM_STREAM_CAPTURE);
340 if (ret)
341 return ret;
342 }
343
344 return 0;
345 }
346
347 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
348 {
349 struct snd_pcm_substream *substream;
350 struct snd_dma_buffer *buf;
351 int stream;
352
353 for (stream = 0; stream < 2; stream++) {
354 substream = pcm->streams[stream].substream;
355 if (!substream)
356 continue;
357 buf = &substream->dma_buffer;
358 if (!buf->area)
359 continue;
360
361 dma_free_coherent(pcm->card->dev, buf->bytes,
362 buf->area, buf->addr);
363 buf->area = NULL;
364 }
365 }
366
367 static struct snd_soc_platform_driver kirkwood_soc_platform = {
368 .ops = &kirkwood_dma_ops,
369 .pcm_new = kirkwood_dma_new,
370 .pcm_free = kirkwood_dma_free_dma_buffers,
371 };
372
373 static int __devinit kirkwood_soc_platform_probe(struct platform_device *pdev)
374 {
375 return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
376 }
377
378 static int __devexit kirkwood_soc_platform_remove(struct platform_device *pdev)
379 {
380 snd_soc_unregister_platform(&pdev->dev);
381 return 0;
382 }
383
384 static struct platform_driver kirkwood_pcm_driver = {
385 .driver = {
386 .name = "kirkwood-pcm-audio",
387 .owner = THIS_MODULE,
388 },
389
390 .probe = kirkwood_soc_platform_probe,
391 .remove = __devexit_p(kirkwood_soc_platform_remove),
392 };
393
394 module_platform_driver(kirkwood_pcm_driver);
395
396 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
397 MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
398 MODULE_LICENSE("GPL");
399 MODULE_ALIAS("platform:kirkwood-pcm-audio");
kernel source for telekom puls (alcatel/mediatek)