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 pr_err("DMA error callback called\n");
76 pr_err("DMA timeout on channel %d -%s%s%s%s\n",
78 err & IMX_DMA_ERR_BURST ? " burst" : "",
79 err & IMX_DMA_ERR_REQUEST ? " request" : "",
80 err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
81 err & IMX_DMA_ERR_BUFFER ? " buffer" : "");
84 static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
86 struct snd_soc_pcm_runtime *rtd = substream->private_data;
87 struct imx_pcm_dma_params *dma_params;
88 struct snd_pcm_runtime *runtime = substream->runtime;
89 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
92 dma_params = snd_soc_get_dma_data(rtd->dai->cpu_dai, substream);
94 iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
96 pr_err("Failed to claim the audio DMA\n");
100 ret = imx_dma_setup_handlers(iprtd->dma,
101 imx_ssi_dma_callback,
102 snd_imx_dma_err_callback, substream);
106 ret = imx_dma_setup_progression_handler(iprtd->dma,
107 imx_ssi_dma_progression);
109 pr_err("Failed to setup the DMA handler\n");
113 ret = imx_dma_config_channel(iprtd->dma,
114 IMX_DMA_MEMSIZE_16 | IMX_DMA_TYPE_FIFO,
115 IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
118 pr_err("Cannot configure DMA channel: %d\n", ret);
122 imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);
126 imx_dma_free(iprtd->dma);
130 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
131 struct snd_pcm_hw_params *params)
133 struct snd_pcm_runtime *runtime = substream->runtime;
134 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
136 unsigned long dma_addr;
138 imx_ssi_dma_alloc(substream);
140 iprtd->size = params_buffer_bytes(params);
141 iprtd->periods = params_periods(params);
142 iprtd->period = params_period_bytes(params);
144 iprtd->period_time = HZ / (params_rate(params) /
145 params_period_size(params));
147 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
149 if (iprtd->sg_count != iprtd->periods) {
150 kfree(iprtd->sg_list);
152 iprtd->sg_list = kcalloc(iprtd->periods + 1,
153 sizeof(struct scatterlist), GFP_KERNEL);
156 iprtd->sg_count = iprtd->periods + 1;
159 sg_init_table(iprtd->sg_list, iprtd->sg_count);
160 dma_addr = runtime->dma_addr;
162 for (i = 0; i < iprtd->periods; i++) {
163 iprtd->sg_list[i].page_link = 0;
164 iprtd->sg_list[i].offset = 0;
165 iprtd->sg_list[i].dma_address = dma_addr;
166 iprtd->sg_list[i].length = iprtd->period;
167 dma_addr += iprtd->period;
171 iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
172 iprtd->sg_list[iprtd->sg_count - 1].length = 0;
173 iprtd->sg_list[iprtd->sg_count - 1].page_link =
174 ((unsigned long) iprtd->sg_list | 0x01) & ~0x02;
178 static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
180 struct snd_pcm_runtime *runtime = substream->runtime;
181 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
183 if (iprtd->dma >= 0) {
184 imx_dma_free(iprtd->dma);
185 iprtd->dma = -EINVAL;
188 kfree(iprtd->sg_list);
189 iprtd->sg_list = NULL;
194 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
196 struct snd_pcm_runtime *runtime = substream->runtime;
197 struct snd_soc_pcm_runtime *rtd = substream->private_data;
198 struct imx_pcm_dma_params *dma_params;
199 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
202 dma_params = snd_soc_get_dma_data(rtd->dai->cpu_dai, substream);
204 iprtd->substream = substream;
205 iprtd->buf = (unsigned int *)substream->dma_buffer.area;
206 iprtd->period_cnt = 0;
208 pr_debug("%s: buf: %p period: %d periods: %d\n",
209 __func__, iprtd->buf, iprtd->period, iprtd->periods);
211 err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
212 IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
213 substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
214 DMA_MODE_WRITE : DMA_MODE_READ);
221 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
223 struct snd_pcm_runtime *runtime = substream->runtime;
224 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
227 case SNDRV_PCM_TRIGGER_START:
228 case SNDRV_PCM_TRIGGER_RESUME:
229 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
230 imx_dma_enable(iprtd->dma);
234 case SNDRV_PCM_TRIGGER_STOP:
235 case SNDRV_PCM_TRIGGER_SUSPEND:
236 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
237 imx_dma_disable(iprtd->dma);
247 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
249 struct snd_pcm_runtime *runtime = substream->runtime;
250 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
252 return bytes_to_frames(substream->runtime, iprtd->offset);
255 static struct snd_pcm_hardware snd_imx_hardware = {
256 .info = SNDRV_PCM_INFO_INTERLEAVED |
257 SNDRV_PCM_INFO_BLOCK_TRANSFER |
258 SNDRV_PCM_INFO_MMAP |
259 SNDRV_PCM_INFO_MMAP_VALID |
260 SNDRV_PCM_INFO_PAUSE |
261 SNDRV_PCM_INFO_RESUME,
262 .formats = SNDRV_PCM_FMTBIT_S16_LE,
266 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
267 .period_bytes_min = 128,
268 .period_bytes_max = 16 * 1024,
274 static int snd_imx_open(struct snd_pcm_substream *substream)
276 struct snd_pcm_runtime *runtime = substream->runtime;
277 struct imx_pcm_runtime_data *iprtd;
280 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
281 runtime->private_data = iprtd;
283 ret = snd_pcm_hw_constraint_integer(substream->runtime,
284 SNDRV_PCM_HW_PARAM_PERIODS);
288 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
292 static struct snd_pcm_ops imx_pcm_ops = {
293 .open = snd_imx_open,
294 .ioctl = snd_pcm_lib_ioctl,
295 .hw_params = snd_imx_pcm_hw_params,
296 .hw_free = snd_imx_pcm_hw_free,
297 .prepare = snd_imx_pcm_prepare,
298 .trigger = snd_imx_pcm_trigger,
299 .pointer = snd_imx_pcm_pointer,
300 .mmap = snd_imx_pcm_mmap,
303 static struct snd_soc_platform imx_soc_platform_dma = {
305 .pcm_ops = &imx_pcm_ops,
306 .pcm_new = imx_pcm_new,
307 .pcm_free = imx_pcm_free,
310 struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,
313 ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
314 ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;
316 return &imx_soc_platform_dma;