2 * imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
4 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
6 * This code is based on code copyrighted by Freescale,
7 * Liam Girdwood, Javier Martin and probably others.
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.
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 #include <linux/slab.h>
24 #include <sound/core.h>
25 #include <sound/initval.h>
26 #include <sound/pcm.h>
27 #include <sound/pcm_params.h>
28 #include <sound/soc.h>
30 #include <mach/dma-mx1-mx2.h>
34 struct imx_pcm_runtime_data {
36 struct scatterlist *sg_list;
39 unsigned long dma_addr;
41 struct snd_pcm_substream *substream;
44 unsigned long period_cnt;
49 /* Called by the DMA framework when a period has elapsed */
50 static void imx_ssi_dma_progression(int channel, void *data,
51 struct scatterlist *sg)
53 struct snd_pcm_substream *substream = data;
54 struct snd_pcm_runtime *runtime = substream->runtime;
55 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
60 runtime = iprtd->substream->runtime;
62 iprtd->offset = sg->dma_address - runtime->dma_addr;
64 snd_pcm_period_elapsed(iprtd->substream);
67 static void imx_ssi_dma_callback(int channel, void *data)
69 pr_err("%s shouldn't be called\n", __func__);
72 static void snd_imx_dma_err_callback(int channel, void *data, int err)
74 struct snd_pcm_substream *substream = data;
75 struct snd_soc_pcm_runtime *rtd = substream->private_data;
76 struct imx_pcm_dma_params *dma_params =
77 snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
78 struct snd_pcm_runtime *runtime = substream->runtime;
79 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
82 pr_err("DMA timeout on channel %d -%s%s%s%s\n",
84 err & IMX_DMA_ERR_BURST ? " burst" : "",
85 err & IMX_DMA_ERR_REQUEST ? " request" : "",
86 err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
87 err & IMX_DMA_ERR_BUFFER ? " buffer" : "");
89 imx_dma_disable(iprtd->dma);
90 ret = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
91 IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
92 substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
93 DMA_MODE_WRITE : DMA_MODE_READ);
95 imx_dma_enable(iprtd->dma);
98 static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
100 struct snd_soc_pcm_runtime *rtd = substream->private_data;
101 struct imx_pcm_dma_params *dma_params;
102 struct snd_pcm_runtime *runtime = substream->runtime;
103 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
106 dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
108 iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
109 if (iprtd->dma < 0) {
110 pr_err("Failed to claim the audio DMA\n");
114 ret = imx_dma_setup_handlers(iprtd->dma,
115 imx_ssi_dma_callback,
116 snd_imx_dma_err_callback, substream);
120 ret = imx_dma_setup_progression_handler(iprtd->dma,
121 imx_ssi_dma_progression);
123 pr_err("Failed to setup the DMA handler\n");
127 ret = imx_dma_config_channel(iprtd->dma,
128 IMX_DMA_MEMSIZE_16 | IMX_DMA_TYPE_FIFO,
129 IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
132 pr_err("Cannot configure DMA channel: %d\n", ret);
136 imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);
140 imx_dma_free(iprtd->dma);
144 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
145 struct snd_pcm_hw_params *params)
147 struct snd_pcm_runtime *runtime = substream->runtime;
148 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
150 unsigned long dma_addr;
152 imx_ssi_dma_alloc(substream);
154 iprtd->size = params_buffer_bytes(params);
155 iprtd->periods = params_periods(params);
156 iprtd->period = params_period_bytes(params);
158 iprtd->period_time = HZ / (params_rate(params) /
159 params_period_size(params));
161 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
163 if (iprtd->sg_count != iprtd->periods) {
164 kfree(iprtd->sg_list);
166 iprtd->sg_list = kcalloc(iprtd->periods + 1,
167 sizeof(struct scatterlist), GFP_KERNEL);
170 iprtd->sg_count = iprtd->periods + 1;
173 sg_init_table(iprtd->sg_list, iprtd->sg_count);
174 dma_addr = runtime->dma_addr;
176 for (i = 0; i < iprtd->periods; i++) {
177 iprtd->sg_list[i].page_link = 0;
178 iprtd->sg_list[i].offset = 0;
179 iprtd->sg_list[i].dma_address = dma_addr;
180 iprtd->sg_list[i].length = iprtd->period;
181 dma_addr += iprtd->period;
185 iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
186 iprtd->sg_list[iprtd->sg_count - 1].length = 0;
187 iprtd->sg_list[iprtd->sg_count - 1].page_link =
188 ((unsigned long) iprtd->sg_list | 0x01) & ~0x02;
192 static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
194 struct snd_pcm_runtime *runtime = substream->runtime;
195 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
197 if (iprtd->dma >= 0) {
198 imx_dma_free(iprtd->dma);
199 iprtd->dma = -EINVAL;
202 kfree(iprtd->sg_list);
203 iprtd->sg_list = NULL;
208 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
210 struct snd_pcm_runtime *runtime = substream->runtime;
211 struct snd_soc_pcm_runtime *rtd = substream->private_data;
212 struct imx_pcm_dma_params *dma_params;
213 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
216 dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
218 iprtd->substream = substream;
219 iprtd->buf = (unsigned int *)substream->dma_buffer.area;
220 iprtd->period_cnt = 0;
222 pr_debug("%s: buf: %p period: %d periods: %d\n",
223 __func__, iprtd->buf, iprtd->period, iprtd->periods);
225 err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
226 IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
227 substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
228 DMA_MODE_WRITE : DMA_MODE_READ);
235 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
237 struct snd_pcm_runtime *runtime = substream->runtime;
238 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
241 case SNDRV_PCM_TRIGGER_START:
242 case SNDRV_PCM_TRIGGER_RESUME:
243 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
244 imx_dma_enable(iprtd->dma);
248 case SNDRV_PCM_TRIGGER_STOP:
249 case SNDRV_PCM_TRIGGER_SUSPEND:
250 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
251 imx_dma_disable(iprtd->dma);
261 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
263 struct snd_pcm_runtime *runtime = substream->runtime;
264 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
266 return bytes_to_frames(substream->runtime, iprtd->offset);
269 static struct snd_pcm_hardware snd_imx_hardware = {
270 .info = SNDRV_PCM_INFO_INTERLEAVED |
271 SNDRV_PCM_INFO_BLOCK_TRANSFER |
272 SNDRV_PCM_INFO_MMAP |
273 SNDRV_PCM_INFO_MMAP_VALID |
274 SNDRV_PCM_INFO_PAUSE |
275 SNDRV_PCM_INFO_RESUME,
276 .formats = SNDRV_PCM_FMTBIT_S16_LE,
280 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
281 .period_bytes_min = 128,
282 .period_bytes_max = 16 * 1024,
288 static int snd_imx_open(struct snd_pcm_substream *substream)
290 struct snd_pcm_runtime *runtime = substream->runtime;
291 struct imx_pcm_runtime_data *iprtd;
294 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
297 runtime->private_data = iprtd;
299 ret = snd_pcm_hw_constraint_integer(substream->runtime,
300 SNDRV_PCM_HW_PARAM_PERIODS);
306 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
310 static struct snd_pcm_ops imx_pcm_ops = {
311 .open = snd_imx_open,
312 .ioctl = snd_pcm_lib_ioctl,
313 .hw_params = snd_imx_pcm_hw_params,
314 .hw_free = snd_imx_pcm_hw_free,
315 .prepare = snd_imx_pcm_prepare,
316 .trigger = snd_imx_pcm_trigger,
317 .pointer = snd_imx_pcm_pointer,
318 .mmap = snd_imx_pcm_mmap,
321 static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
323 .pcm_new = imx_pcm_new,
324 .pcm_free = imx_pcm_free,
327 static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
329 return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
332 static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
334 snd_soc_unregister_platform(&pdev->dev);
338 static struct platform_driver imx_pcm_driver = {
340 .name = "imx-pcm-audio",
341 .owner = THIS_MODULE,
344 .probe = imx_soc_platform_probe,
345 .remove = __devexit_p(imx_soc_platform_remove),
348 static int __init snd_imx_pcm_init(void)
350 return platform_driver_register(&imx_pcm_driver);
352 module_init(snd_imx_pcm_init);
354 static void __exit snd_imx_pcm_exit(void)
356 platform_driver_unregister(&imx_pcm_driver);
358 module_exit(snd_imx_pcm_exit);