c78c000e2afe908d8d3b521dfdb4506308029f74
[linux-2.6.git] / sound / soc / imx / imx-pcm-dma-mx2.c
1 /*
2  * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
3  *
4  * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
5  *
6  * This code is based on code copyrighted by Freescale,
7  * Liam Girdwood, Javier Martin and probably others.
8  *
9  *  This program is free software; you can redistribute  it and/or modify it
10  *  under  the terms of  the GNU General  Public License as published by the
11  *  Free Software Foundation;  either version 2 of the  License, or (at your
12  *  option) any later version.
13  */
14 #include <linux/clk.h>
15 #include <linux/delay.h>
16 #include <linux/device.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/module.h>
21 #include <linux/platform_device.h>
22
23 #include <sound/core.h>
24 #include <sound/initval.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
27 #include <sound/soc.h>
28
29 #include <mach/dma-mx1-mx2.h>
30
31 #include "imx-ssi.h"
32
33 struct imx_pcm_runtime_data {
34         int sg_count;
35         struct scatterlist *sg_list;
36         int period;
37         int periods;
38         unsigned long dma_addr;
39         int dma;
40         struct snd_pcm_substream *substream;
41         unsigned long offset;
42         unsigned long size;
43         unsigned long period_cnt;
44         void *buf;
45         int period_time;
46 };
47
48 /* Called by the DMA framework when a period has elapsed */
49 static void imx_ssi_dma_progression(int channel, void *data,
50                                         struct scatterlist *sg)
51 {
52         struct snd_pcm_substream *substream = data;
53         struct snd_pcm_runtime *runtime = substream->runtime;
54         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
55
56         if (!sg)
57                 return;
58
59         runtime = iprtd->substream->runtime;
60
61         iprtd->offset = sg->dma_address - runtime->dma_addr;
62
63         snd_pcm_period_elapsed(iprtd->substream);
64 }
65
66 static void imx_ssi_dma_callback(int channel, void *data)
67 {
68         pr_err("%s shouldn't be called\n", __func__);
69 }
70
71 static void snd_imx_dma_err_callback(int channel, void *data, int err)
72 {
73         pr_err("DMA error callback called\n");
74
75         pr_err("DMA timeout on channel %d -%s%s%s%s\n",
76                  channel,
77                  err & IMX_DMA_ERR_BURST ?    " burst" : "",
78                  err & IMX_DMA_ERR_REQUEST ?  " request" : "",
79                  err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
80                  err & IMX_DMA_ERR_BUFFER ?   " buffer" : "");
81 }
82
83 static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
84 {
85         struct snd_soc_pcm_runtime *rtd = substream->private_data;
86         struct imx_pcm_dma_params *dma_params;
87         struct snd_pcm_runtime *runtime = substream->runtime;
88         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
89         int ret;
90
91         dma_params = snd_soc_get_dma_data(rtd->dai->cpu_dai, substream);
92
93         iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
94         if (iprtd->dma < 0) {
95                 pr_err("Failed to claim the audio DMA\n");
96                 return -ENODEV;
97         }
98
99         ret = imx_dma_setup_handlers(iprtd->dma,
100                                 imx_ssi_dma_callback,
101                                 snd_imx_dma_err_callback, substream);
102         if (ret)
103                 goto out;
104
105         ret = imx_dma_setup_progression_handler(iprtd->dma,
106                         imx_ssi_dma_progression);
107         if (ret) {
108                 pr_err("Failed to setup the DMA handler\n");
109                 goto out;
110         }
111
112         ret = imx_dma_config_channel(iprtd->dma,
113                         IMX_DMA_MEMSIZE_16 | IMX_DMA_TYPE_FIFO,
114                         IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
115                         dma_params->dma, 1);
116         if (ret < 0) {
117                 pr_err("Cannot configure DMA channel: %d\n", ret);
118                 goto out;
119         }
120
121         imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);
122
123         return 0;
124 out:
125         imx_dma_free(iprtd->dma);
126         return ret;
127 }
128
129 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
130                                 struct snd_pcm_hw_params *params)
131 {
132         struct snd_pcm_runtime *runtime = substream->runtime;
133         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
134         int i;
135         unsigned long dma_addr;
136
137         imx_ssi_dma_alloc(substream);
138
139         iprtd->size = params_buffer_bytes(params);
140         iprtd->periods = params_periods(params);
141         iprtd->period = params_period_bytes(params);
142         iprtd->offset = 0;
143         iprtd->period_time = HZ / (params_rate(params) /
144                         params_period_size(params));
145
146         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
147
148         if (iprtd->sg_count != iprtd->periods) {
149                 kfree(iprtd->sg_list);
150
151                 iprtd->sg_list = kcalloc(iprtd->periods + 1,
152                                 sizeof(struct scatterlist), GFP_KERNEL);
153                 if (!iprtd->sg_list)
154                         return -ENOMEM;
155                 iprtd->sg_count = iprtd->periods + 1;
156         }
157
158         sg_init_table(iprtd->sg_list, iprtd->sg_count);
159         dma_addr = runtime->dma_addr;
160
161         for (i = 0; i < iprtd->periods; i++) {
162                 iprtd->sg_list[i].page_link = 0;
163                 iprtd->sg_list[i].offset = 0;
164                 iprtd->sg_list[i].dma_address = dma_addr;
165                 iprtd->sg_list[i].length = iprtd->period;
166                 dma_addr += iprtd->period;
167         }
168
169         /* close the loop */
170         iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
171         iprtd->sg_list[iprtd->sg_count - 1].length = 0;
172         iprtd->sg_list[iprtd->sg_count - 1].page_link =
173                         ((unsigned long) iprtd->sg_list | 0x01) & ~0x02;
174         return 0;
175 }
176
177 static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
178 {
179         struct snd_pcm_runtime *runtime = substream->runtime;
180         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
181
182         if (iprtd->dma >= 0) {
183                 imx_dma_free(iprtd->dma);
184                 iprtd->dma = -EINVAL;
185         }
186
187         kfree(iprtd->sg_list);
188         iprtd->sg_list = NULL;
189
190         return 0;
191 }
192
193 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
194 {
195         struct snd_pcm_runtime *runtime = substream->runtime;
196         struct snd_soc_pcm_runtime *rtd = substream->private_data;
197         struct imx_pcm_dma_params *dma_params;
198         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
199         int err;
200
201         dma_params = snd_soc_get_dma_data(rtd->dai->cpu_dai, substream);
202
203         iprtd->substream = substream;
204         iprtd->buf = (unsigned int *)substream->dma_buffer.area;
205         iprtd->period_cnt = 0;
206
207         pr_debug("%s: buf: %p period: %d periods: %d\n",
208                         __func__, iprtd->buf, iprtd->period, iprtd->periods);
209
210         err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
211                         IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
212                         substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
213                         DMA_MODE_WRITE : DMA_MODE_READ);
214         if (err)
215                 return err;
216
217         return 0;
218 }
219
220 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
221 {
222         struct snd_pcm_runtime *runtime = substream->runtime;
223         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
224
225         switch (cmd) {
226         case SNDRV_PCM_TRIGGER_START:
227         case SNDRV_PCM_TRIGGER_RESUME:
228         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
229                 imx_dma_enable(iprtd->dma);
230
231                 break;
232
233         case SNDRV_PCM_TRIGGER_STOP:
234         case SNDRV_PCM_TRIGGER_SUSPEND:
235         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
236                 imx_dma_disable(iprtd->dma);
237
238                 break;
239         default:
240                 return -EINVAL;
241         }
242
243         return 0;
244 }
245
246 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
247 {
248         struct snd_pcm_runtime *runtime = substream->runtime;
249         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
250
251         return bytes_to_frames(substream->runtime, iprtd->offset);
252 }
253
254 static struct snd_pcm_hardware snd_imx_hardware = {
255         .info = SNDRV_PCM_INFO_INTERLEAVED |
256                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
257                 SNDRV_PCM_INFO_MMAP |
258                 SNDRV_PCM_INFO_MMAP_VALID |
259                 SNDRV_PCM_INFO_PAUSE |
260                 SNDRV_PCM_INFO_RESUME,
261         .formats = SNDRV_PCM_FMTBIT_S16_LE,
262         .rate_min = 8000,
263         .channels_min = 2,
264         .channels_max = 2,
265         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
266         .period_bytes_min = 128,
267         .period_bytes_max = 16 * 1024,
268         .periods_min = 2,
269         .periods_max = 255,
270         .fifo_size = 0,
271 };
272
273 static int snd_imx_open(struct snd_pcm_substream *substream)
274 {
275         struct snd_pcm_runtime *runtime = substream->runtime;
276         struct imx_pcm_runtime_data *iprtd;
277         int ret;
278
279         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
280         runtime->private_data = iprtd;
281
282         ret = snd_pcm_hw_constraint_integer(substream->runtime,
283                         SNDRV_PCM_HW_PARAM_PERIODS);
284         if (ret < 0)
285                 return ret;
286
287         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
288         return 0;
289 }
290
291 static struct snd_pcm_ops imx_pcm_ops = {
292         .open           = snd_imx_open,
293         .ioctl          = snd_pcm_lib_ioctl,
294         .hw_params      = snd_imx_pcm_hw_params,
295         .hw_free        = snd_imx_pcm_hw_free,
296         .prepare        = snd_imx_pcm_prepare,
297         .trigger        = snd_imx_pcm_trigger,
298         .pointer        = snd_imx_pcm_pointer,
299         .mmap           = snd_imx_pcm_mmap,
300 };
301
302 static struct snd_soc_platform imx_soc_platform_dma = {
303         .name           = "imx-audio",
304         .pcm_ops        = &imx_pcm_ops,
305         .pcm_new        = imx_pcm_new,
306         .pcm_free       = imx_pcm_free,
307 };
308
309 struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,
310                 struct imx_ssi *ssi)
311 {
312         ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
313         ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;
314
315         return &imx_soc_platform_dma;
316 }
317