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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / sound / soc / kirkwood / kirkwood-dma.c
blobd038540271285f90b8d093643fcfeb7de07cc8b6
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_44100 | \
26 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
27 #define KIRKWOOD_FORMATS \
28 (SNDRV_PCM_FMTBIT_S16_LE | \
29 SNDRV_PCM_FMTBIT_S24_LE | \
30 SNDRV_PCM_FMTBIT_S32_LE)
31
32 struct kirkwood_dma_priv {
33 struct snd_pcm_substream *play_stream;
34 struct snd_pcm_substream *rec_stream;
35 struct kirkwood_dma_data *data;
36 };
37
38 static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
39 .info = (SNDRV_PCM_INFO_INTERLEAVED |
40 SNDRV_PCM_INFO_MMAP |
41 SNDRV_PCM_INFO_MMAP_VALID |
42 SNDRV_PCM_INFO_BLOCK_TRANSFER |
43 SNDRV_PCM_INFO_PAUSE),
44 .formats = KIRKWOOD_FORMATS,
45 .rates = KIRKWOOD_RATES,
46 .rate_min = 44100,
47 .rate_max = 96000,
48 .channels_min = 1,
49 .channels_max = 2,
50 .buffer_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS,
51 .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
52 .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
53 .periods_min = KIRKWOOD_SND_MIN_PERIODS,
54 .periods_max = KIRKWOOD_SND_MAX_PERIODS,
55 .fifo_size = 0,
56 };
57
58 static u64 kirkwood_dma_dmamask = 0xFFFFFFFFUL;
59
60 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
61 {
62 struct kirkwood_dma_priv *prdata = dev_id;
63 struct kirkwood_dma_data *priv = prdata->data;
64 unsigned long mask, status, cause;
65
66 mask = readl(priv->io + KIRKWOOD_INT_MASK);
67 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
68
69 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
70 if (unlikely(cause)) {
71 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
72 __func__, cause);
73 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
74 return IRQ_HANDLED;
75 }
76
77 /* we've enabled only bytes interrupts ... */
78 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
79 KIRKWOOD_INT_CAUSE_REC_BYTES)) {
80 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
81 __func__, status);
82 return IRQ_NONE;
83 }
84
85 /* ack int */
86 writel(status, priv->io + KIRKWOOD_INT_CAUSE);
87
88 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
89 snd_pcm_period_elapsed(prdata->play_stream);
90
91 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
92 snd_pcm_period_elapsed(prdata->rec_stream);
93
94 return IRQ_HANDLED;
95 }
96
97 static void
98 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
99 unsigned long dma,
100 const struct mbus_dram_target_info *dram)
101 {
102 int i;
103
104 /* First disable and clear windows */
105 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
106 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
107
108 /* try to find matching cs for current dma address */
109 for (i = 0; i < dram->num_cs; i++) {
110 const struct mbus_dram_window *cs = dram->cs + i;
111 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
112 writel(cs->base & 0xffff0000,
113 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
114 writel(((cs->size - 1) & 0xffff0000) |
115 (cs->mbus_attr << 8) |
116 (dram->mbus_dram_target_id << 4) | 1,
117 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
118 }
119 }
120 }
121
122 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
123 {
124 int err;
125 struct snd_pcm_runtime *runtime = substream->runtime;
126 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
127 struct snd_soc_platform *platform = soc_runtime->platform;
128 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
129 struct kirkwood_dma_data *priv;
130 struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
131 const struct mbus_dram_target_info *dram;
132 unsigned long addr;
133
134 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
135 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
136
137 /* Ensure that all constraints linked to dma burst are fulfilled */
138 err = snd_pcm_hw_constraint_minmax(runtime,
139 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
140 priv->burst * 2,
141 KIRKWOOD_AUDIO_BUF_MAX-1);
142 if (err < 0)
143 return err;
144
145 err = snd_pcm_hw_constraint_step(runtime, 0,
146 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
147 priv->burst);
148 if (err < 0)
149 return err;
150
151 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
152 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
153 priv->burst);
154 if (err < 0)
155 return err;
156
157 if (prdata == NULL) {
158 prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
159 if (prdata == NULL)
160 return -ENOMEM;
161
162 prdata->data = priv;
163
164 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
165 "kirkwood-i2s", prdata);
166 if (err) {
167 kfree(prdata);
168 return -EBUSY;
169 }
170
171 snd_soc_platform_set_drvdata(platform, prdata);
172
173 /*
174 * Enable Error interrupts. We're only ack'ing them but
175 * it's useful for diagnostics
176 */
177 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
178 }
179
180 dram = mv_mbus_dram_info();
181 addr = virt_to_phys(substream->dma_buffer.area);
182 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
183 prdata->play_stream = substream;
184 kirkwood_dma_conf_mbus_windows(priv->io,
185 KIRKWOOD_PLAYBACK_WIN, addr, dram);
186 } else {
187 prdata->rec_stream = substream;
188 kirkwood_dma_conf_mbus_windows(priv->io,
189 KIRKWOOD_RECORD_WIN, addr, dram);
190 }
191
192 return 0;
193 }
194
195 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
196 {
197 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
198 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
199 struct snd_soc_platform *platform = soc_runtime->platform;
200 struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
201 struct kirkwood_dma_data *priv;
202
203 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
204
205 if (!prdata || !priv)
206 return 0;
207
208 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
209 prdata->play_stream = NULL;
210 else
211 prdata->rec_stream = NULL;
212
213 if (!prdata->play_stream && !prdata->rec_stream) {
214 writel(0, priv->io + KIRKWOOD_ERR_MASK);
215 free_irq(priv->irq, prdata);
216 kfree(prdata);
217 snd_soc_platform_set_drvdata(platform, NULL);
218 }
219
220 return 0;
221 }
222
223 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
224 struct snd_pcm_hw_params *params)
225 {
226 struct snd_pcm_runtime *runtime = substream->runtime;
227
228 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
229 runtime->dma_bytes = params_buffer_bytes(params);
230
231 return 0;
232 }
233
234 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
235 {
236 snd_pcm_set_runtime_buffer(substream, NULL);
237 return 0;
238 }
239
240 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
241 {
242 struct snd_pcm_runtime *runtime = substream->runtime;
243 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
244 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
245 struct kirkwood_dma_data *priv;
246 unsigned long size, count;
247
248 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
249
250 /* compute buffer size in term of "words" as requested in specs */
251 size = frames_to_bytes(runtime, runtime->buffer_size);
252 size = (size>>2)-1;
253 count = snd_pcm_lib_period_bytes(substream);
254
255 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
256 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
257 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
258 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
259 } else {
260 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
261 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
262 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
263 }
264
265
266 return 0;
267 }
268
269 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
270 *substream)
271 {
272 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
273 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
274 struct kirkwood_dma_data *priv;
275 snd_pcm_uframes_t count;
276
277 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
278
279 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
280 count = bytes_to_frames(substream->runtime,
281 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
282 else
283 count = bytes_to_frames(substream->runtime,
284 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
285
286 return count;
287 }
288
289 struct snd_pcm_ops kirkwood_dma_ops = {
290 .open = kirkwood_dma_open,
291 .close = kirkwood_dma_close,
292 .ioctl = snd_pcm_lib_ioctl,
293 .hw_params = kirkwood_dma_hw_params,
294 .hw_free = kirkwood_dma_hw_free,
295 .prepare = kirkwood_dma_prepare,
296 .pointer = kirkwood_dma_pointer,
297 };
298
299 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
300 int stream)
301 {
302 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
303 struct snd_dma_buffer *buf = &substream->dma_buffer;
304 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
305
306 buf->dev.type = SNDRV_DMA_TYPE_DEV;
307 buf->dev.dev = pcm->card->dev;
308 buf->area = dma_alloc_coherent(pcm->card->dev, size,
309 &buf->addr, GFP_KERNEL);
310 if (!buf->area)
311 return -ENOMEM;
312 buf->bytes = size;
313 buf->private_data = NULL;
314
315 return 0;
316 }
317
318 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
319 {
320 struct snd_card *card = rtd->card->snd_card;
321 struct snd_pcm *pcm = rtd->pcm;
322 int ret;
323
324 if (!card->dev->dma_mask)
325 card->dev->dma_mask = &kirkwood_dma_dmamask;
326 if (!card->dev->coherent_dma_mask)
327 card->dev->coherent_dma_mask = 0xffffffff;
328
329 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
330 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
331 SNDRV_PCM_STREAM_PLAYBACK);
332 if (ret)
333 return ret;
334 }
335
336 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
337 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
338 SNDRV_PCM_STREAM_CAPTURE);
339 if (ret)
340 return ret;
341 }
342
343 return 0;
344 }
345
346 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
347 {
348 struct snd_pcm_substream *substream;
349 struct snd_dma_buffer *buf;
350 int stream;
351
352 for (stream = 0; stream < 2; stream++) {
353 substream = pcm->streams[stream].substream;
354 if (!substream)
355 continue;
356 buf = &substream->dma_buffer;
357 if (!buf->area)
358 continue;
359
360 dma_free_coherent(pcm->card->dev, buf->bytes,
361 buf->area, buf->addr);
362 buf->area = NULL;
363 }
364 }
365
366 static struct snd_soc_platform_driver kirkwood_soc_platform = {
367 .ops = &kirkwood_dma_ops,
368 .pcm_new = kirkwood_dma_new,
369 .pcm_free = kirkwood_dma_free_dma_buffers,
370 };
371
372 static int __devinit kirkwood_soc_platform_probe(struct platform_device *pdev)
373 {
374 return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
375 }
376
377 static int __devexit kirkwood_soc_platform_remove(struct platform_device *pdev)
378 {
379 snd_soc_unregister_platform(&pdev->dev);
380 return 0;
381 }
382
383 static struct platform_driver kirkwood_pcm_driver = {
384 .driver = {
385 .name = "kirkwood-pcm-audio",
386 .owner = THIS_MODULE,
387 },
388
389 .probe = kirkwood_soc_platform_probe,
390 .remove = __devexit_p(kirkwood_soc_platform_remove),
391 };
392
393 module_platform_driver(kirkwood_pcm_driver);
394
395 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
396 MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
397 MODULE_LICENSE("GPL");
398 MODULE_ALIAS("platform:kirkwood-pcm-audio");