Merge tag 'trace-seq-buf-3.19-v2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[firefly-linux-kernel-4.4.55.git] / sound / arm / pxa2xx-pcm-lib.c
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
7 #include <linux/slab.h>
8 #include <linux/module.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/dmaengine.h>
11
12 #include <sound/core.h>
13 #include <sound/pcm.h>
14 #include <sound/pcm_params.h>
15 #include <sound/pxa2xx-lib.h>
16 #include <sound/dmaengine_pcm.h>
17
18 #include <mach/dma.h>
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;
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         }
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;
89                         dma_desc->dtadr = rtd->params->addr;
90                 } else {
91                         dma_desc->dsadr = rtd->params->addr;
92                         dma_desc->dtadr = dma_buff_phys;
93                 }
94                 if (period > totsize)
95                         period = totsize;
96                 dma_desc->dcmd = dcmd | period | DCMD_ENDIRQEN;
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
110         if (rtd && rtd->params && rtd->params->filter_data) {
111                 unsigned long req = *(unsigned long *) rtd->params->filter_data;
112                 DRCMR(req) = 0;
113         }
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;
172         unsigned long req;
173
174         if (!prtd || !prtd->params)
175                 return 0;
176
177         if (prtd->dma_ch == -1)
178                 return -EINVAL;
179
180         DCSR(prtd->dma_ch) &= ~DCSR_RUN;
181         DCSR(prtd->dma_ch) = 0;
182         DCMD(prtd->dma_ch) = 0;
183         req = *(unsigned long *) prtd->params->filter_data;
184         DRCMR(req) = prtd->dma_ch | DRCMR_MAPVLD;
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;
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 {
201                 printk(KERN_ERR "DMA error on channel %d (DCSR=%#x)\n",
202                         dma_ch, dcsr);
203                 snd_pcm_stop_xrun(substream);
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;
237         rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
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
246         rtd->dma_ch = -1;
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");