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>
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>
29 #include <mach/dma-mx1-mx2.h>
33 struct imx_pcm_runtime_data {
35 struct scatterlist *sg_list;
38 unsigned long dma_addr;
40 struct snd_pcm_substream *substream;
43 unsigned long period_cnt;
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)
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;
59 runtime = iprtd->substream->runtime;
61 iprtd->offset = sg->dma_address - runtime->dma_addr;
63 snd_pcm_period_elapsed(iprtd->substream);
66 static void imx_ssi_dma_callback(int channel, void *data)
68 pr_err("%s shouldn't be called\n", __func__);
71 static void snd_imx_dma_err_callback(int channel, void *data, int err)
73 pr_err("DMA error callback called\n");
75 pr_err("DMA timeout on channel %d -%s%s%s%s\n",
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" : "");
83 static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
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;
91 iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
93 pr_err("Failed to claim the audio DMA\n");
97 ret = imx_dma_setup_handlers(iprtd->dma,
99 snd_imx_dma_err_callback, substream);
103 ret = imx_dma_setup_progression_handler(iprtd->dma,
104 imx_ssi_dma_progression);
106 pr_err("Failed to setup the DMA handler\n");
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,
115 pr_err("Cannot configure DMA channel: %d\n", ret);
119 imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);
123 imx_dma_free(iprtd->dma);
127 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
128 struct snd_pcm_hw_params *params)
130 struct snd_pcm_runtime *runtime = substream->runtime;
131 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
133 unsigned long dma_addr;
135 imx_ssi_dma_alloc(substream);
137 iprtd->size = params_buffer_bytes(params);
138 iprtd->periods = params_periods(params);
139 iprtd->period = params_period_bytes(params);
141 iprtd->period_time = HZ / (params_rate(params) /
142 params_period_size(params));
144 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
146 if (iprtd->sg_count != iprtd->periods) {
147 kfree(iprtd->sg_list);
149 iprtd->sg_list = kcalloc(iprtd->periods + 1,
150 sizeof(struct scatterlist), GFP_KERNEL);
153 iprtd->sg_count = iprtd->periods + 1;
156 sg_init_table(iprtd->sg_list, iprtd->sg_count);
157 dma_addr = runtime->dma_addr;
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;
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;
175 static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
177 struct snd_pcm_runtime *runtime = substream->runtime;
178 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
180 if (iprtd->dma >= 0) {
181 imx_dma_free(iprtd->dma);
182 iprtd->dma = -EINVAL;
185 kfree(iprtd->sg_list);
186 iprtd->sg_list = NULL;
191 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
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;
199 iprtd->substream = substream;
200 iprtd->buf = (unsigned int *)substream->dma_buffer.area;
201 iprtd->period_cnt = 0;
203 pr_debug("%s: buf: %p period: %d periods: %d\n",
204 __func__, iprtd->buf, iprtd->period, iprtd->periods);
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);
216 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
218 struct snd_pcm_runtime *runtime = substream->runtime;
219 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
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);
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);
242 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
244 struct snd_pcm_runtime *runtime = substream->runtime;
245 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
247 return bytes_to_frames(substream->runtime, iprtd->offset);
250 static 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,
261 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
262 .period_bytes_min = 128,
263 .period_bytes_max = 16 * 1024,
269 static int snd_imx_open(struct snd_pcm_substream *substream)
271 struct snd_pcm_runtime *runtime = substream->runtime;
272 struct imx_pcm_runtime_data *iprtd;
275 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
276 runtime->private_data = iprtd;
278 ret = snd_pcm_hw_constraint_integer(substream->runtime,
279 SNDRV_PCM_HW_PARAM_PERIODS);
283 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
287 static 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,
298 static struct snd_soc_platform imx_soc_platform_dma = {
300 .pcm_ops = &imx_pcm_ops,
301 .pcm_new = imx_pcm_new,
302 .pcm_free = imx_pcm_free,
305 struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,
308 ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
309 ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;
311 return &imx_soc_platform_dma;