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Diffstat (limited to 'sound/soc/imx/imx-pcm-dma-mx2.c')
-rw-r--r--sound/soc/imx/imx-pcm-dma-mx2.c313
1 files changed, 313 insertions, 0 deletions
diff --git a/sound/soc/imx/imx-pcm-dma-mx2.c b/sound/soc/imx/imx-pcm-dma-mx2.c
new file mode 100644
index 000000000000..19452e44afdc
--- /dev/null
+++ b/sound/soc/imx/imx-pcm-dma-mx2.c
@@ -0,0 +1,313 @@
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
33struct 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 */
49static 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
66static void imx_ssi_dma_callback(int channel, void *data)
67{
68 pr_err("%s shouldn't be called\n", __func__);
69}
70
71static 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
83static 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 = rtd->dai->cpu_dai->dma_data;
87 struct snd_pcm_runtime *runtime = substream->runtime;
88 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
89 int ret;
90
91 iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
92 if (iprtd->dma < 0) {
93 pr_err("Failed to claim the audio DMA\n");
94 return -ENODEV;
95 }
96
97 ret = imx_dma_setup_handlers(iprtd->dma,
98 imx_ssi_dma_callback,
99 snd_imx_dma_err_callback, substream);
100 if (ret)
101 goto out;
102
103 ret = imx_dma_setup_progression_handler(iprtd->dma,
104 imx_ssi_dma_progression);
105 if (ret) {
106 pr_err("Failed to setup the DMA handler\n");
107 goto out;
108 }
109
110 ret = imx_dma_config_channel(iprtd->dma,
111 IMX_DMA_MEMSIZE_16 | IMX_DMA_TYPE_FIFO,
112 IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
113 dma_params->dma, 1);
114 if (ret < 0) {
115 pr_err("Cannot configure DMA channel: %d\n", ret);
116 goto out;
117 }
118
119 imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);
120
121 return 0;
122out:
123 imx_dma_free(iprtd->dma);
124 return ret;
125}
126
127static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
128 struct snd_pcm_hw_params *params)
129{
130 struct snd_pcm_runtime *runtime = substream->runtime;
131 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
132 int i;
133 unsigned long dma_addr;
134
135 imx_ssi_dma_alloc(substream);
136
137 iprtd->size = params_buffer_bytes(params);
138 iprtd->periods = params_periods(params);
139 iprtd->period = params_period_bytes(params);
140 iprtd->offset = 0;
141 iprtd->period_time = HZ / (params_rate(params) /
142 params_period_size(params));
143
144 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
145
146 if (iprtd->sg_count != iprtd->periods) {
147 kfree(iprtd->sg_list);
148
149 iprtd->sg_list = kcalloc(iprtd->periods + 1,
150 sizeof(struct scatterlist), GFP_KERNEL);
151 if (!iprtd->sg_list)
152 return -ENOMEM;
153 iprtd->sg_count = iprtd->periods + 1;
154 }
155
156 sg_init_table(iprtd->sg_list, iprtd->sg_count);
157 dma_addr = runtime->dma_addr;
158
159 for (i = 0; i < iprtd->periods; i++) {
160 iprtd->sg_list[i].page_link = 0;
161 iprtd->sg_list[i].offset = 0;
162 iprtd->sg_list[i].dma_address = dma_addr;
163 iprtd->sg_list[i].length = iprtd->period;
164 dma_addr += iprtd->period;
165 }
166
167 /* close the loop */
168 iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
169 iprtd->sg_list[iprtd->sg_count - 1].length = 0;
170 iprtd->sg_list[iprtd->sg_count - 1].page_link =
171 ((unsigned long) iprtd->sg_list | 0x01) & ~0x02;
172 return 0;
173}
174
175static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
176{
177 struct snd_pcm_runtime *runtime = substream->runtime;
178 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
179
180 if (iprtd->dma >= 0) {
181 imx_dma_free(iprtd->dma);
182 iprtd->dma = -EINVAL;
183 }
184
185 kfree(iprtd->sg_list);
186 iprtd->sg_list = NULL;
187
188 return 0;
189}
190
191static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
192{
193 struct snd_pcm_runtime *runtime = substream->runtime;
194 struct snd_soc_pcm_runtime *rtd = substream->private_data;
195 struct imx_pcm_dma_params *dma_params = rtd->dai->cpu_dai->dma_data;
196 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
197 int err;
198
199 iprtd->substream = substream;
200 iprtd->buf = (unsigned int *)substream->dma_buffer.area;
201 iprtd->period_cnt = 0;
202
203 pr_debug("%s: buf: %p period: %d periods: %d\n",
204 __func__, iprtd->buf, iprtd->period, iprtd->periods);
205
206 err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
207 IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
208 substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
209 DMA_MODE_WRITE : DMA_MODE_READ);
210 if (err)
211 return err;
212
213 return 0;
214}
215
216static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
217{
218 struct snd_pcm_runtime *runtime = substream->runtime;
219 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
220
221 switch (cmd) {
222 case SNDRV_PCM_TRIGGER_START:
223 case SNDRV_PCM_TRIGGER_RESUME:
224 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
225 imx_dma_enable(iprtd->dma);
226
227 break;
228
229 case SNDRV_PCM_TRIGGER_STOP:
230 case SNDRV_PCM_TRIGGER_SUSPEND:
231 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
232 imx_dma_disable(iprtd->dma);
233
234 break;
235 default:
236 return -EINVAL;
237 }
238
239 return 0;
240}
241
242static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
243{
244 struct snd_pcm_runtime *runtime = substream->runtime;
245 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
246
247 return bytes_to_frames(substream->runtime, iprtd->offset);
248}
249
250static struct snd_pcm_hardware snd_imx_hardware = {
251 .info = SNDRV_PCM_INFO_INTERLEAVED |
252 SNDRV_PCM_INFO_BLOCK_TRANSFER |
253 SNDRV_PCM_INFO_MMAP |
254 SNDRV_PCM_INFO_MMAP_VALID |
255 SNDRV_PCM_INFO_PAUSE |
256 SNDRV_PCM_INFO_RESUME,
257 .formats = SNDRV_PCM_FMTBIT_S16_LE,
258 .rate_min = 8000,
259 .channels_min = 2,
260 .channels_max = 2,
261 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
262 .period_bytes_min = 128,
263 .period_bytes_max = 16 * 1024,
264 .periods_min = 2,
265 .periods_max = 255,
266 .fifo_size = 0,
267};
268
269static int snd_imx_open(struct snd_pcm_substream *substream)
270{
271 struct snd_pcm_runtime *runtime = substream->runtime;
272 struct imx_pcm_runtime_data *iprtd;
273 int ret;
274
275 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
276 runtime->private_data = iprtd;
277
278 ret = snd_pcm_hw_constraint_integer(substream->runtime,
279 SNDRV_PCM_HW_PARAM_PERIODS);
280 if (ret < 0)
281 return ret;
282
283 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
284 return 0;
285}
286
287static struct snd_pcm_ops imx_pcm_ops = {
288 .open = snd_imx_open,
289 .ioctl = snd_pcm_lib_ioctl,
290 .hw_params = snd_imx_pcm_hw_params,
291 .hw_free = snd_imx_pcm_hw_free,
292 .prepare = snd_imx_pcm_prepare,
293 .trigger = snd_imx_pcm_trigger,
294 .pointer = snd_imx_pcm_pointer,
295 .mmap = snd_imx_pcm_mmap,
296};
297
298static struct snd_soc_platform imx_soc_platform_dma = {
299 .name = "imx-audio",
300 .pcm_ops = &imx_pcm_ops,
301 .pcm_new = imx_pcm_new,
302 .pcm_free = imx_pcm_free,
303};
304
305struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,
306 struct imx_ssi *ssi)
307{
308 ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
309 ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;
310
311 return &imx_soc_platform_dma;
312}
313
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 01:22:24 -0500