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2c484df0 TI |
1 | /* |
2 | * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip | |
3 | * | |
4 | * Author: Nicolas Pitre | |
5 | * Created: Nov 30, 2004 | |
6 | * Copyright: (C) 2004 MontaVista Software, Inc. | |
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 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | ||
2c484df0 TI |
19 | #include <sound/core.h> |
20 | #include <sound/pcm.h> | |
21 | #include <sound/pcm_params.h> | |
22 | ||
23 | #include <asm/dma.h> | |
24 | #include <asm/hardware.h> | |
25 | #include <asm/arch/pxa-regs.h> | |
26 | ||
27 | #include "pxa2xx-pcm.h" | |
28 | ||
29 | ||
d18f8376 | 30 | static const struct snd_pcm_hardware pxa2xx_pcm_hardware = { |
2c484df0 TI |
31 | .info = SNDRV_PCM_INFO_MMAP | |
32 | SNDRV_PCM_INFO_MMAP_VALID | | |
33 | SNDRV_PCM_INFO_INTERLEAVED | | |
34 | SNDRV_PCM_INFO_PAUSE, | |
35 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
36 | .period_bytes_min = 32, | |
37 | .period_bytes_max = 8192 - 32, | |
38 | .periods_min = 1, | |
39 | .periods_max = PAGE_SIZE/sizeof(pxa_dma_desc), | |
40 | .buffer_bytes_max = 128 * 1024, | |
41 | .fifo_size = 32, | |
42 | }; | |
43 | ||
44 | struct pxa2xx_runtime_data { | |
45 | int dma_ch; | |
d18f8376 | 46 | struct pxa2xx_pcm_dma_params *params; |
2c484df0 TI |
47 | pxa_dma_desc *dma_desc_array; |
48 | dma_addr_t dma_desc_array_phys; | |
49 | }; | |
50 | ||
d18f8376 TI |
51 | static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, |
52 | struct snd_pcm_hw_params *params) | |
2c484df0 | 53 | { |
d18f8376 | 54 | struct snd_pcm_runtime *runtime = substream->runtime; |
2c484df0 TI |
55 | struct pxa2xx_runtime_data *rtd = runtime->private_data; |
56 | size_t totsize = params_buffer_bytes(params); | |
57 | size_t period = params_period_bytes(params); | |
58 | pxa_dma_desc *dma_desc; | |
59 | dma_addr_t dma_buff_phys, next_desc_phys; | |
60 | ||
61 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
62 | runtime->dma_bytes = totsize; | |
63 | ||
64 | dma_desc = rtd->dma_desc_array; | |
65 | next_desc_phys = rtd->dma_desc_array_phys; | |
66 | dma_buff_phys = runtime->dma_addr; | |
67 | do { | |
68 | next_desc_phys += sizeof(pxa_dma_desc); | |
69 | dma_desc->ddadr = next_desc_phys; | |
70 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
71 | dma_desc->dsadr = dma_buff_phys; | |
72 | dma_desc->dtadr = rtd->params->dev_addr; | |
73 | } else { | |
74 | dma_desc->dsadr = rtd->params->dev_addr; | |
75 | dma_desc->dtadr = dma_buff_phys; | |
76 | } | |
77 | if (period > totsize) | |
78 | period = totsize; | |
79 | dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN; | |
80 | dma_desc++; | |
81 | dma_buff_phys += period; | |
82 | } while (totsize -= period); | |
83 | dma_desc[-1].ddadr = rtd->dma_desc_array_phys; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
d18f8376 | 88 | static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) |
2c484df0 TI |
89 | { |
90 | struct pxa2xx_runtime_data *rtd = substream->runtime->private_data; | |
91 | ||
92 | *rtd->params->drcmr = 0; | |
93 | snd_pcm_set_runtime_buffer(substream, NULL); | |
94 | return 0; | |
95 | } | |
96 | ||
d18f8376 | 97 | static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream) |
2c484df0 | 98 | { |
d18f8376 TI |
99 | struct pxa2xx_pcm_client *client = substream->private_data; |
100 | struct snd_pcm_runtime *runtime = substream->runtime; | |
2c484df0 TI |
101 | struct pxa2xx_runtime_data *rtd = runtime->private_data; |
102 | ||
103 | DCSR(rtd->dma_ch) &= ~DCSR_RUN; | |
104 | DCSR(rtd->dma_ch) = 0; | |
105 | DCMD(rtd->dma_ch) = 0; | |
106 | *rtd->params->drcmr = rtd->dma_ch | DRCMR_MAPVLD; | |
107 | ||
108 | return client->prepare(substream); | |
109 | } | |
110 | ||
d18f8376 | 111 | static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
2c484df0 TI |
112 | { |
113 | struct pxa2xx_runtime_data *rtd = substream->runtime->private_data; | |
114 | int ret = 0; | |
115 | ||
116 | switch (cmd) { | |
117 | case SNDRV_PCM_TRIGGER_START: | |
118 | DDADR(rtd->dma_ch) = rtd->dma_desc_array_phys; | |
119 | DCSR(rtd->dma_ch) = DCSR_RUN; | |
120 | break; | |
121 | ||
122 | case SNDRV_PCM_TRIGGER_STOP: | |
123 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
124 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
125 | DCSR(rtd->dma_ch) &= ~DCSR_RUN; | |
126 | break; | |
127 | ||
128 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
129 | DCSR(rtd->dma_ch) |= DCSR_RUN; | |
130 | break; | |
131 | ||
132 | default: | |
133 | ret = -EINVAL; | |
134 | } | |
135 | ||
136 | return ret; | |
137 | } | |
138 | ||
7d12e780 | 139 | static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id) |
2c484df0 | 140 | { |
d18f8376 | 141 | struct snd_pcm_substream *substream = dev_id; |
2c484df0 TI |
142 | struct pxa2xx_runtime_data *rtd = substream->runtime->private_data; |
143 | int dcsr; | |
144 | ||
145 | dcsr = DCSR(dma_ch); | |
146 | DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN; | |
147 | ||
148 | if (dcsr & DCSR_ENDINTR) { | |
149 | snd_pcm_period_elapsed(substream); | |
150 | } else { | |
151 | printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n", | |
152 | rtd->params->name, dma_ch, dcsr ); | |
153 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | |
154 | } | |
155 | } | |
156 | ||
d18f8376 | 157 | static snd_pcm_uframes_t pxa2xx_pcm_pointer(struct snd_pcm_substream *substream) |
2c484df0 | 158 | { |
d18f8376 | 159 | struct snd_pcm_runtime *runtime = substream->runtime; |
2c484df0 TI |
160 | struct pxa2xx_runtime_data *rtd = runtime->private_data; |
161 | dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? | |
162 | DSADR(rtd->dma_ch) : DTADR(rtd->dma_ch); | |
163 | snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr); | |
164 | if (x == runtime->buffer_size) | |
165 | x = 0; | |
166 | return x; | |
167 | } | |
168 | ||
169 | static int | |
d18f8376 | 170 | pxa2xx_pcm_hw_rule_mult32(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) |
2c484df0 | 171 | { |
d18f8376 | 172 | struct snd_interval *i = hw_param_interval(params, rule->var); |
2c484df0 TI |
173 | int changed = 0; |
174 | ||
175 | if (i->min & 31) { | |
176 | i->min = (i->min & ~31) + 32; | |
177 | i->openmin = 0; | |
178 | changed = 1; | |
179 | } | |
180 | ||
181 | if (i->max & 31) { | |
182 | i->max &= ~31; | |
183 | i->openmax = 0; | |
184 | changed = 1; | |
185 | } | |
186 | ||
187 | return changed; | |
188 | } | |
189 | ||
d18f8376 | 190 | static int pxa2xx_pcm_open(struct snd_pcm_substream *substream) |
2c484df0 | 191 | { |
d18f8376 TI |
192 | struct pxa2xx_pcm_client *client = substream->private_data; |
193 | struct snd_pcm_runtime *runtime = substream->runtime; | |
2c484df0 TI |
194 | struct pxa2xx_runtime_data *rtd; |
195 | int ret; | |
196 | ||
197 | runtime->hw = pxa2xx_pcm_hardware; | |
198 | ||
199 | /* | |
200 | * For mysterious reasons (and despite what the manual says) | |
201 | * playback samples are lost if the DMA count is not a multiple | |
202 | * of the DMA burst size. Let's add a rule to enforce that. | |
203 | */ | |
204 | ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, | |
205 | pxa2xx_pcm_hw_rule_mult32, NULL, | |
206 | SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1); | |
207 | if (ret) | |
208 | goto out; | |
209 | ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, | |
210 | pxa2xx_pcm_hw_rule_mult32, NULL, | |
211 | SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); | |
212 | if (ret) | |
213 | goto out; | |
214 | ||
215 | ret = -ENOMEM; | |
216 | rtd = kmalloc(sizeof(*rtd), GFP_KERNEL); | |
217 | if (!rtd) | |
218 | goto out; | |
219 | rtd->dma_desc_array = | |
220 | dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE, | |
221 | &rtd->dma_desc_array_phys, GFP_KERNEL); | |
222 | if (!rtd->dma_desc_array) | |
223 | goto err1; | |
224 | ||
225 | rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? | |
226 | client->playback_params : client->capture_params; | |
227 | ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW, | |
228 | pxa2xx_pcm_dma_irq, substream); | |
229 | if (ret < 0) | |
230 | goto err2; | |
231 | rtd->dma_ch = ret; | |
232 | ||
233 | runtime->private_data = rtd; | |
234 | ret = client->startup(substream); | |
235 | if (!ret) | |
236 | goto out; | |
237 | ||
238 | pxa_free_dma(rtd->dma_ch); | |
239 | err2: | |
240 | dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE, | |
241 | rtd->dma_desc_array, rtd->dma_desc_array_phys); | |
242 | err1: | |
243 | kfree(rtd); | |
244 | out: | |
245 | return ret; | |
246 | } | |
247 | ||
d18f8376 | 248 | static int pxa2xx_pcm_close(struct snd_pcm_substream *substream) |
2c484df0 | 249 | { |
d18f8376 | 250 | struct pxa2xx_pcm_client *client = substream->private_data; |
2c484df0 TI |
251 | struct pxa2xx_runtime_data *rtd = substream->runtime->private_data; |
252 | ||
253 | pxa_free_dma(rtd->dma_ch); | |
254 | client->shutdown(substream); | |
255 | dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE, | |
256 | rtd->dma_desc_array, rtd->dma_desc_array_phys); | |
257 | kfree(rtd); | |
258 | return 0; | |
259 | } | |
260 | ||
261 | static int | |
d18f8376 | 262 | pxa2xx_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma) |
2c484df0 | 263 | { |
d18f8376 | 264 | struct snd_pcm_runtime *runtime = substream->runtime; |
2c484df0 TI |
265 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, |
266 | runtime->dma_area, | |
267 | runtime->dma_addr, | |
268 | runtime->dma_bytes); | |
269 | } | |
270 | ||
d18f8376 | 271 | static struct snd_pcm_ops pxa2xx_pcm_ops = { |
2c484df0 TI |
272 | .open = pxa2xx_pcm_open, |
273 | .close = pxa2xx_pcm_close, | |
274 | .ioctl = snd_pcm_lib_ioctl, | |
275 | .hw_params = pxa2xx_pcm_hw_params, | |
276 | .hw_free = pxa2xx_pcm_hw_free, | |
277 | .prepare = pxa2xx_pcm_prepare, | |
278 | .trigger = pxa2xx_pcm_trigger, | |
279 | .pointer = pxa2xx_pcm_pointer, | |
280 | .mmap = pxa2xx_pcm_mmap, | |
281 | }; | |
282 | ||
d18f8376 | 283 | static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
2c484df0 | 284 | { |
d18f8376 | 285 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; |
2c484df0 TI |
286 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
287 | size_t size = pxa2xx_pcm_hardware.buffer_bytes_max; | |
288 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
289 | buf->dev.dev = pcm->card->dev; | |
290 | buf->private_data = NULL; | |
291 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
292 | &buf->addr, GFP_KERNEL); | |
293 | if (!buf->area) | |
294 | return -ENOMEM; | |
295 | buf->bytes = size; | |
296 | return 0; | |
297 | } | |
298 | ||
d18f8376 | 299 | static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm) |
2c484df0 | 300 | { |
d18f8376 | 301 | struct snd_pcm_substream *substream; |
2c484df0 TI |
302 | struct snd_dma_buffer *buf; |
303 | int stream; | |
304 | ||
305 | for (stream = 0; stream < 2; stream++) { | |
306 | substream = pcm->streams[stream].substream; | |
307 | if (!substream) | |
308 | continue; | |
309 | buf = &substream->dma_buffer; | |
310 | if (!buf->area) | |
311 | continue; | |
312 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
313 | buf->area, buf->addr); | |
314 | buf->area = NULL; | |
315 | } | |
316 | } | |
317 | ||
318 | static u64 pxa2xx_pcm_dmamask = 0xffffffff; | |
319 | ||
d18f8376 TI |
320 | int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client, |
321 | struct snd_pcm **rpcm) | |
2c484df0 | 322 | { |
d18f8376 | 323 | struct snd_pcm *pcm; |
2c484df0 TI |
324 | int play = client->playback_params ? 1 : 0; |
325 | int capt = client->capture_params ? 1 : 0; | |
326 | int ret; | |
327 | ||
328 | ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm); | |
329 | if (ret) | |
330 | goto out; | |
331 | ||
332 | pcm->private_data = client; | |
333 | pcm->private_free = pxa2xx_pcm_free_dma_buffers; | |
334 | ||
335 | if (!card->dev->dma_mask) | |
336 | card->dev->dma_mask = &pxa2xx_pcm_dmamask; | |
337 | if (!card->dev->coherent_dma_mask) | |
338 | card->dev->coherent_dma_mask = 0xffffffff; | |
339 | ||
340 | if (play) { | |
341 | int stream = SNDRV_PCM_STREAM_PLAYBACK; | |
342 | snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops); | |
343 | ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream); | |
344 | if (ret) | |
345 | goto out; | |
346 | } | |
347 | if (capt) { | |
348 | int stream = SNDRV_PCM_STREAM_CAPTURE; | |
349 | snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops); | |
350 | ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream); | |
351 | if (ret) | |
352 | goto out; | |
353 | } | |
354 | ||
355 | if (rpcm) | |
356 | *rpcm = pcm; | |
357 | ret = 0; | |
358 | ||
359 | out: | |
360 | return ret; | |
361 | } | |
362 | ||
363 | EXPORT_SYMBOL(pxa2xx_pcm_new); | |
364 | ||
365 | MODULE_AUTHOR("Nicolas Pitre"); | |
366 | MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); | |
367 | MODULE_LICENSE("GPL"); |