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a6d77317 DB |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License version 2 as | |
4 | * published by the Free Software Foundation. | |
5 | */ | |
6 | ||
5a0e3ad6 | 7 | #include <linux/slab.h> |
a6d77317 DB |
8 | #include <linux/module.h> |
9 | #include <linux/dma-mapping.h> | |
d65a1458 | 10 | #include <linux/dmaengine.h> |
a6d77317 DB |
11 | |
12 | #include <sound/core.h> | |
13 | #include <sound/pcm.h> | |
14 | #include <sound/pcm_params.h> | |
15 | #include <sound/pxa2xx-lib.h> | |
d65a1458 | 16 | #include <sound/dmaengine_pcm.h> |
a6d77317 | 17 | |
5742964e | 18 | #include <mach/dma.h> |
a6d77317 DB |
19 | |
20 | #include "pxa2xx-pcm.h" | |
21 | ||
22 | static const struct snd_pcm_hardware pxa2xx_pcm_hardware = { | |
23 | .info = SNDRV_PCM_INFO_MMAP | | |
24 | SNDRV_PCM_INFO_MMAP_VALID | | |
25 | SNDRV_PCM_INFO_INTERLEAVED | | |
26 | SNDRV_PCM_INFO_PAUSE | | |
27 | SNDRV_PCM_INFO_RESUME, | |
28 | .formats = SNDRV_PCM_FMTBIT_S16_LE | | |
29 | SNDRV_PCM_FMTBIT_S24_LE | | |
30 | SNDRV_PCM_FMTBIT_S32_LE, | |
31 | .period_bytes_min = 32, | |
32 | .period_bytes_max = 8192 - 32, | |
33 | .periods_min = 1, | |
34 | .periods_max = PAGE_SIZE/sizeof(pxa_dma_desc), | |
35 | .buffer_bytes_max = 128 * 1024, | |
36 | .fifo_size = 32, | |
37 | }; | |
38 | ||
39 | int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, | |
40 | struct snd_pcm_hw_params *params) | |
41 | { | |
42 | struct snd_pcm_runtime *runtime = substream->runtime; | |
43 | struct pxa2xx_runtime_data *rtd = runtime->private_data; | |
44 | size_t totsize = params_buffer_bytes(params); | |
45 | size_t period = params_period_bytes(params); | |
46 | pxa_dma_desc *dma_desc; | |
47 | dma_addr_t dma_buff_phys, next_desc_phys; | |
d65a1458 DM |
48 | u32 dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG; |
49 | ||
50 | /* temporary transition hack */ | |
51 | switch (rtd->params->addr_width) { | |
52 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
53 | dcmd |= DCMD_WIDTH1; | |
54 | break; | |
55 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
56 | dcmd |= DCMD_WIDTH2; | |
57 | break; | |
58 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
59 | dcmd |= DCMD_WIDTH4; | |
60 | break; | |
61 | default: | |
62 | /* can't happen */ | |
63 | break; | |
64 | } | |
65 | ||
66 | switch (rtd->params->maxburst) { | |
67 | case 8: | |
68 | dcmd |= DCMD_BURST8; | |
69 | break; | |
70 | case 16: | |
71 | dcmd |= DCMD_BURST16; | |
72 | break; | |
73 | case 32: | |
74 | dcmd |= DCMD_BURST32; | |
75 | break; | |
76 | } | |
a6d77317 DB |
77 | |
78 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
79 | runtime->dma_bytes = totsize; | |
80 | ||
81 | dma_desc = rtd->dma_desc_array; | |
82 | next_desc_phys = rtd->dma_desc_array_phys; | |
83 | dma_buff_phys = runtime->dma_addr; | |
84 | do { | |
85 | next_desc_phys += sizeof(pxa_dma_desc); | |
86 | dma_desc->ddadr = next_desc_phys; | |
87 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
88 | dma_desc->dsadr = dma_buff_phys; | |
d65a1458 | 89 | dma_desc->dtadr = rtd->params->addr; |
a6d77317 | 90 | } else { |
d65a1458 | 91 | dma_desc->dsadr = rtd->params->addr; |
a6d77317 DB |
92 | dma_desc->dtadr = dma_buff_phys; |
93 | } | |
94 | if (period > totsize) | |
95 | period = totsize; | |
d65a1458 | 96 | dma_desc->dcmd = dcmd | period | DCMD_ENDIRQEN; |
a6d77317 DB |
97 | dma_desc++; |
98 | dma_buff_phys += period; | |
99 | } while (totsize -= period); | |
100 | dma_desc[-1].ddadr = rtd->dma_desc_array_phys; | |
101 | ||
102 | return 0; | |
103 | } | |
104 | EXPORT_SYMBOL(__pxa2xx_pcm_hw_params); | |
105 | ||
106 | int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) | |
107 | { | |
108 | struct pxa2xx_runtime_data *rtd = substream->runtime->private_data; | |
109 | ||
d65a1458 DM |
110 | if (rtd && rtd->params && rtd->params->filter_data) { |
111 | unsigned long req = *(unsigned long *) rtd->params->filter_data; | |
112 | DRCMR(req) = 0; | |
113 | } | |
a6d77317 DB |
114 | |
115 | snd_pcm_set_runtime_buffer(substream, NULL); | |
116 | return 0; | |
117 | } | |
118 | EXPORT_SYMBOL(__pxa2xx_pcm_hw_free); | |
119 | ||
120 | int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
121 | { | |
122 | struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; | |
123 | int ret = 0; | |
124 | ||
125 | switch (cmd) { | |
126 | case SNDRV_PCM_TRIGGER_START: | |
127 | DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys; | |
128 | DCSR(prtd->dma_ch) = DCSR_RUN; | |
129 | break; | |
130 | ||
131 | case SNDRV_PCM_TRIGGER_STOP: | |
132 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
133 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
134 | DCSR(prtd->dma_ch) &= ~DCSR_RUN; | |
135 | break; | |
136 | ||
137 | case SNDRV_PCM_TRIGGER_RESUME: | |
138 | DCSR(prtd->dma_ch) |= DCSR_RUN; | |
139 | break; | |
140 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
141 | DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys; | |
142 | DCSR(prtd->dma_ch) |= DCSR_RUN; | |
143 | break; | |
144 | ||
145 | default: | |
146 | ret = -EINVAL; | |
147 | } | |
148 | ||
149 | return ret; | |
150 | } | |
151 | EXPORT_SYMBOL(pxa2xx_pcm_trigger); | |
152 | ||
153 | snd_pcm_uframes_t | |
154 | pxa2xx_pcm_pointer(struct snd_pcm_substream *substream) | |
155 | { | |
156 | struct snd_pcm_runtime *runtime = substream->runtime; | |
157 | struct pxa2xx_runtime_data *prtd = runtime->private_data; | |
158 | ||
159 | dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? | |
160 | DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch); | |
161 | snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr); | |
162 | ||
163 | if (x == runtime->buffer_size) | |
164 | x = 0; | |
165 | return x; | |
166 | } | |
167 | EXPORT_SYMBOL(pxa2xx_pcm_pointer); | |
168 | ||
169 | int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream) | |
170 | { | |
171 | struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; | |
d65a1458 | 172 | unsigned long req; |
a6d77317 | 173 | |
f8bae4ca MB |
174 | if (!prtd || !prtd->params) |
175 | return 0; | |
176 | ||
97c96c07 VK |
177 | if (prtd->dma_ch == -1) |
178 | return -EINVAL; | |
179 | ||
a6d77317 DB |
180 | DCSR(prtd->dma_ch) &= ~DCSR_RUN; |
181 | DCSR(prtd->dma_ch) = 0; | |
182 | DCMD(prtd->dma_ch) = 0; | |
d65a1458 DM |
183 | req = *(unsigned long *) prtd->params->filter_data; |
184 | DRCMR(req) = prtd->dma_ch | DRCMR_MAPVLD; | |
a6d77317 DB |
185 | |
186 | return 0; | |
187 | } | |
188 | EXPORT_SYMBOL(__pxa2xx_pcm_prepare); | |
189 | ||
190 | void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id) | |
191 | { | |
192 | struct snd_pcm_substream *substream = dev_id; | |
a6d77317 DB |
193 | int dcsr; |
194 | ||
195 | dcsr = DCSR(dma_ch); | |
196 | DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN; | |
197 | ||
198 | if (dcsr & DCSR_ENDINTR) { | |
199 | snd_pcm_period_elapsed(substream); | |
200 | } else { | |
d65a1458 DM |
201 | printk(KERN_ERR "DMA error on channel %d (DCSR=%#x)\n", |
202 | dma_ch, dcsr); | |
1fb8510c | 203 | snd_pcm_stop_xrun(substream); |
a6d77317 DB |
204 | } |
205 | } | |
206 | EXPORT_SYMBOL(pxa2xx_pcm_dma_irq); | |
207 | ||
208 | int __pxa2xx_pcm_open(struct snd_pcm_substream *substream) | |
209 | { | |
210 | struct snd_pcm_runtime *runtime = substream->runtime; | |
211 | struct pxa2xx_runtime_data *rtd; | |
212 | int ret; | |
213 | ||
214 | runtime->hw = pxa2xx_pcm_hardware; | |
215 | ||
216 | /* | |
217 | * For mysterious reasons (and despite what the manual says) | |
218 | * playback samples are lost if the DMA count is not a multiple | |
219 | * of the DMA burst size. Let's add a rule to enforce that. | |
220 | */ | |
221 | ret = snd_pcm_hw_constraint_step(runtime, 0, | |
222 | SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32); | |
223 | if (ret) | |
224 | goto out; | |
225 | ||
226 | ret = snd_pcm_hw_constraint_step(runtime, 0, | |
227 | SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32); | |
228 | if (ret) | |
229 | goto out; | |
230 | ||
231 | ret = snd_pcm_hw_constraint_integer(runtime, | |
232 | SNDRV_PCM_HW_PARAM_PERIODS); | |
233 | if (ret < 0) | |
234 | goto out; | |
235 | ||
236 | ret = -ENOMEM; | |
13095c37 | 237 | rtd = kzalloc(sizeof(*rtd), GFP_KERNEL); |
a6d77317 DB |
238 | if (!rtd) |
239 | goto out; | |
240 | rtd->dma_desc_array = | |
241 | dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE, | |
242 | &rtd->dma_desc_array_phys, GFP_KERNEL); | |
243 | if (!rtd->dma_desc_array) | |
244 | goto err1; | |
245 | ||
8727b909 | 246 | rtd->dma_ch = -1; |
a6d77317 DB |
247 | runtime->private_data = rtd; |
248 | return 0; | |
249 | ||
250 | err1: | |
251 | kfree(rtd); | |
252 | out: | |
253 | return ret; | |
254 | } | |
255 | EXPORT_SYMBOL(__pxa2xx_pcm_open); | |
256 | ||
257 | int __pxa2xx_pcm_close(struct snd_pcm_substream *substream) | |
258 | { | |
259 | struct snd_pcm_runtime *runtime = substream->runtime; | |
260 | struct pxa2xx_runtime_data *rtd = runtime->private_data; | |
261 | ||
262 | dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE, | |
263 | rtd->dma_desc_array, rtd->dma_desc_array_phys); | |
264 | kfree(rtd); | |
265 | return 0; | |
266 | } | |
267 | EXPORT_SYMBOL(__pxa2xx_pcm_close); | |
268 | ||
269 | int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream, | |
270 | struct vm_area_struct *vma) | |
271 | { | |
272 | struct snd_pcm_runtime *runtime = substream->runtime; | |
273 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
274 | runtime->dma_area, | |
275 | runtime->dma_addr, | |
276 | runtime->dma_bytes); | |
277 | } | |
278 | EXPORT_SYMBOL(pxa2xx_pcm_mmap); | |
279 | ||
280 | int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) | |
281 | { | |
282 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
283 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
284 | size_t size = pxa2xx_pcm_hardware.buffer_bytes_max; | |
285 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
286 | buf->dev.dev = pcm->card->dev; | |
287 | buf->private_data = NULL; | |
288 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
289 | &buf->addr, GFP_KERNEL); | |
290 | if (!buf->area) | |
291 | return -ENOMEM; | |
292 | buf->bytes = size; | |
293 | return 0; | |
294 | } | |
295 | EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer); | |
296 | ||
297 | void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
298 | { | |
299 | struct snd_pcm_substream *substream; | |
300 | struct snd_dma_buffer *buf; | |
301 | int stream; | |
302 | ||
303 | for (stream = 0; stream < 2; stream++) { | |
304 | substream = pcm->streams[stream].substream; | |
305 | if (!substream) | |
306 | continue; | |
307 | buf = &substream->dma_buffer; | |
308 | if (!buf->area) | |
309 | continue; | |
310 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
311 | buf->area, buf->addr); | |
312 | buf->area = NULL; | |
313 | } | |
314 | } | |
315 | EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers); | |
316 | ||
317 | MODULE_AUTHOR("Nicolas Pitre"); | |
318 | MODULE_DESCRIPTION("Intel PXA2xx sound library"); | |
319 | MODULE_LICENSE("GPL"); |