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Add linux-next specific files for 20110831
[linux-2.6/next.git] / sound / soc / kirkwood / kirkwood-dma.c
blobcd33de1c5b7a88bead8fe1c3ee25ae1bb6752c32
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 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
98 unsigned long dma,
99 struct mbus_dram_target_info *dram)
100 {
101 int i;
102
103 /* First disable and clear windows */
104 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
105 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
106
107 /* try to find matching cs for current dma address */
108 for (i = 0; i < dram->num_cs; i++) {
109 struct mbus_dram_window *cs = dram->cs + i;
110 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
111 writel(cs->base & 0xffff0000,
112 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
113 writel(((cs->size - 1) & 0xffff0000) |
114 (cs->mbus_attr << 8) |
115 (dram->mbus_dram_target_id << 4) | 1,
116 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
117 }
118 }
119 }
120
121 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
122 {
123 int err;
124 struct snd_pcm_runtime *runtime = substream->runtime;
125 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
126 struct snd_soc_platform *platform = soc_runtime->platform;
127 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
128 struct kirkwood_dma_data *priv;
129 struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
130 unsigned long addr;
131
132 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
133 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
134
135 /* Ensure that all constraints linked to dma burst are fulfilled */
136 err = snd_pcm_hw_constraint_minmax(runtime,
137 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
138 priv->burst * 2,
139 KIRKWOOD_AUDIO_BUF_MAX-1);
140 if (err < 0)
141 return err;
142
143 err = snd_pcm_hw_constraint_step(runtime, 0,
144 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
145 priv->burst);
146 if (err < 0)
147 return err;
148
149 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
150 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
151 priv->burst);
152 if (err < 0)
153 return err;
154
155 if (prdata == NULL) {
156 prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
157 if (prdata == NULL)
158 return -ENOMEM;
159
160 prdata->data = priv;
161
162 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
163 "kirkwood-i2s", prdata);
164 if (err) {
165 kfree(prdata);
166 return -EBUSY;
167 }
168
169 snd_soc_platform_set_drvdata(platform, prdata);
170
171 /*
172 * Enable Error interrupts. We're only ack'ing them but
173 * it's useful for diagnostics
174 */
175 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
176 }
177
178 addr = virt_to_phys(substream->dma_buffer.area);
179 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
180 prdata->play_stream = substream;
181 kirkwood_dma_conf_mbus_windows(priv->io,
182 KIRKWOOD_PLAYBACK_WIN, addr, priv->dram);
183 } else {
184 prdata->rec_stream = substream;
185 kirkwood_dma_conf_mbus_windows(priv->io,
186 KIRKWOOD_RECORD_WIN, addr, priv->dram);
187 }
188
189 return 0;
190 }
191
192 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
193 {
194 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
195 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
196 struct snd_soc_platform *platform = soc_runtime->platform;
197 struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
198 struct kirkwood_dma_data *priv;
199
200 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
201
202 if (!prdata || !priv)
203 return 0;
204
205 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
206 prdata->play_stream = NULL;
207 else
208 prdata->rec_stream = NULL;
209
210 if (!prdata->play_stream && !prdata->rec_stream) {
211 writel(0, priv->io + KIRKWOOD_ERR_MASK);
212 free_irq(priv->irq, prdata);
213 kfree(prdata);
214 snd_soc_platform_set_drvdata(platform, NULL);
215 }
216
217 return 0;
218 }
219
220 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
221 struct snd_pcm_hw_params *params)
222 {
223 struct snd_pcm_runtime *runtime = substream->runtime;
224
225 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
226 runtime->dma_bytes = params_buffer_bytes(params);
227
228 return 0;
229 }
230
231 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
232 {
233 snd_pcm_set_runtime_buffer(substream, NULL);
234 return 0;
235 }
236
237 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
238 {
239 struct snd_pcm_runtime *runtime = substream->runtime;
240 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
241 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
242 struct kirkwood_dma_data *priv;
243 unsigned long size, count;
244
245 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
246
247 /* compute buffer size in term of "words" as requested in specs */
248 size = frames_to_bytes(runtime, runtime->buffer_size);
249 size = (size>>2)-1;
250 count = snd_pcm_lib_period_bytes(substream);
251
252 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
253 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
254 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
255 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
256 } else {
257 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
258 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
259 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
260 }
261
262
263 return 0;
264 }
265
266 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
267 *substream)
268 {
269 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
270 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
271 struct kirkwood_dma_data *priv;
272 snd_pcm_uframes_t count;
273
274 priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
275
276 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
277 count = bytes_to_frames(substream->runtime,
278 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
279 else
280 count = bytes_to_frames(substream->runtime,
281 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
282
283 return count;
284 }
285
286 struct snd_pcm_ops kirkwood_dma_ops = {
287 .open = kirkwood_dma_open,
288 .close = kirkwood_dma_close,
289 .ioctl = snd_pcm_lib_ioctl,
290 .hw_params = kirkwood_dma_hw_params,
291 .hw_free = kirkwood_dma_hw_free,
292 .prepare = kirkwood_dma_prepare,
293 .pointer = kirkwood_dma_pointer,
294 };
295
296 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
297 int stream)
298 {
299 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
300 struct snd_dma_buffer *buf = &substream->dma_buffer;
301 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
302
303 buf->dev.type = SNDRV_DMA_TYPE_DEV;
304 buf->dev.dev = pcm->card->dev;
305 buf->area = dma_alloc_coherent(pcm->card->dev, size,
306 &buf->addr, GFP_KERNEL);
307 if (!buf->area)
308 return -ENOMEM;
309 buf->bytes = size;
310 buf->private_data = NULL;
311
312 return 0;
313 }
314
315 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
316 {
317 struct snd_card *card = rtd->card->snd_card;
318 struct snd_soc_dai *dai = rtd->cpu_dai;
319 struct snd_pcm *pcm = rtd->pcm;
320 int ret;
321
322 if (!card->dev->dma_mask)
323 card->dev->dma_mask = &kirkwood_dma_dmamask;
324 if (!card->dev->coherent_dma_mask)
325 card->dev->coherent_dma_mask = 0xffffffff;
326
327 if (dai->driver->playback.channels_min) {
328 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
329 SNDRV_PCM_STREAM_PLAYBACK);
330 if (ret)
331 return ret;
332 }
333
334 if (dai->driver->capture.channels_min) {
335 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
336 SNDRV_PCM_STREAM_CAPTURE);
337 if (ret)
338 return ret;
339 }
340
341 return 0;
342 }
343
344 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
345 {
346 struct snd_pcm_substream *substream;
347 struct snd_dma_buffer *buf;
348 int stream;
349
350 for (stream = 0; stream < 2; stream++) {
351 substream = pcm->streams[stream].substream;
352 if (!substream)
353 continue;
354 buf = &substream->dma_buffer;
355 if (!buf->area)
356 continue;
357
358 dma_free_coherent(pcm->card->dev, buf->bytes,
359 buf->area, buf->addr);
360 buf->area = NULL;
361 }
362 }
363
364 static struct snd_soc_platform_driver kirkwood_soc_platform = {
365 .ops = &kirkwood_dma_ops,
366 .pcm_new = kirkwood_dma_new,
367 .pcm_free = kirkwood_dma_free_dma_buffers,
368 };
369
370 static int __devinit kirkwood_soc_platform_probe(struct platform_device *pdev)
371 {
372 return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
373 }
374
375 static int __devexit kirkwood_soc_platform_remove(struct platform_device *pdev)
376 {
377 snd_soc_unregister_platform(&pdev->dev);
378 return 0;
379 }
380
381 static struct platform_driver kirkwood_pcm_driver = {
382 .driver = {
383 .name = "kirkwood-pcm-audio",
384 .owner = THIS_MODULE,
385 },
386
387 .probe = kirkwood_soc_platform_probe,
388 .remove = __devexit_p(kirkwood_soc_platform_remove),
389 };
390
391 static int __init kirkwood_pcm_init(void)
392 {
393 return platform_driver_register(&kirkwood_pcm_driver);
394 }
395 module_init(kirkwood_pcm_init);
396
397 static void __exit kirkwood_pcm_exit(void)
398 {
399 platform_driver_unregister(&kirkwood_pcm_driver);
400 }
401 module_exit(kirkwood_pcm_exit);
402
403 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
404 MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
405 MODULE_LICENSE("GPL");
406 MODULE_ALIAS("platform:kirkwood-pcm-audio");
linux-next