Dong Aisheng | ed6e1d0 | 2011-07-21 12:36:55 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved. |
| 3 | * |
| 4 | * Based on sound/soc/imx/imx-pcm-dma-mx2.c |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/clk.h> |
| 22 | #include <linux/delay.h> |
| 23 | #include <linux/device.h> |
| 24 | #include <linux/dma-mapping.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/platform_device.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/dmaengine.h> |
| 31 | |
| 32 | #include <sound/core.h> |
| 33 | #include <sound/initval.h> |
| 34 | #include <sound/pcm.h> |
| 35 | #include <sound/pcm_params.h> |
| 36 | #include <sound/soc.h> |
| 37 | |
| 38 | #include <mach/dma.h> |
| 39 | #include "mxs-pcm.h" |
| 40 | |
| 41 | static struct snd_pcm_hardware snd_mxs_hardware = { |
| 42 | .info = SNDRV_PCM_INFO_MMAP | |
| 43 | SNDRV_PCM_INFO_MMAP_VALID | |
| 44 | SNDRV_PCM_INFO_PAUSE | |
| 45 | SNDRV_PCM_INFO_RESUME | |
| 46 | SNDRV_PCM_INFO_INTERLEAVED, |
| 47 | .formats = SNDRV_PCM_FMTBIT_S16_LE | |
| 48 | SNDRV_PCM_FMTBIT_S20_3LE | |
| 49 | SNDRV_PCM_FMTBIT_S24_LE, |
| 50 | .channels_min = 2, |
| 51 | .channels_max = 2, |
| 52 | .period_bytes_min = 32, |
| 53 | .period_bytes_max = 8192, |
| 54 | .periods_min = 1, |
| 55 | .periods_max = 52, |
| 56 | .buffer_bytes_max = 64 * 1024, |
| 57 | .fifo_size = 32, |
| 58 | |
| 59 | }; |
| 60 | |
| 61 | static void audio_dma_irq(void *data) |
| 62 | { |
| 63 | struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data; |
| 64 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 65 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; |
| 66 | |
| 67 | iprtd->offset += iprtd->period_bytes; |
| 68 | iprtd->offset %= iprtd->period_bytes * iprtd->periods; |
| 69 | snd_pcm_period_elapsed(substream); |
| 70 | } |
| 71 | |
| 72 | static bool filter(struct dma_chan *chan, void *param) |
| 73 | { |
| 74 | struct mxs_pcm_runtime_data *iprtd = param; |
| 75 | struct mxs_pcm_dma_params *dma_params = iprtd->dma_params; |
| 76 | |
| 77 | if (!mxs_dma_is_apbx(chan)) |
| 78 | return false; |
| 79 | |
| 80 | if (chan->chan_id != dma_params->chan_num) |
| 81 | return false; |
| 82 | |
| 83 | chan->private = &iprtd->dma_data; |
| 84 | |
| 85 | return true; |
| 86 | } |
| 87 | |
Lars-Peter Clausen | 95a771c | 2012-02-22 10:49:07 +0100 | [diff] [blame^] | 88 | static int mxs_dma_alloc(struct snd_pcm_substream *substream) |
Dong Aisheng | ed6e1d0 | 2011-07-21 12:36:55 +0800 | [diff] [blame] | 89 | { |
| 90 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 91 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 92 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; |
| 93 | dma_cap_mask_t mask; |
| 94 | |
| 95 | iprtd->dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
| 96 | |
| 97 | dma_cap_zero(mask); |
| 98 | dma_cap_set(DMA_SLAVE, mask); |
| 99 | iprtd->dma_data.chan_irq = iprtd->dma_params->chan_irq; |
| 100 | iprtd->dma_chan = dma_request_channel(mask, filter, iprtd); |
| 101 | if (!iprtd->dma_chan) |
| 102 | return -EINVAL; |
| 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream, |
| 108 | struct snd_pcm_hw_params *params) |
| 109 | { |
| 110 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 111 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; |
| 112 | unsigned long dma_addr; |
| 113 | struct dma_chan *chan; |
Dong Aisheng | ed6e1d0 | 2011-07-21 12:36:55 +0800 | [diff] [blame] | 114 | |
Dong Aisheng | ed6e1d0 | 2011-07-21 12:36:55 +0800 | [diff] [blame] | 115 | chan = iprtd->dma_chan; |
| 116 | |
Dong Aisheng | ed6e1d0 | 2011-07-21 12:36:55 +0800 | [diff] [blame] | 117 | iprtd->periods = params_periods(params); |
| 118 | iprtd->period_bytes = params_period_bytes(params); |
| 119 | iprtd->offset = 0; |
Dong Aisheng | ed6e1d0 | 2011-07-21 12:36:55 +0800 | [diff] [blame] | 120 | |
| 121 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| 122 | |
| 123 | dma_addr = runtime->dma_addr; |
| 124 | |
Dong Aisheng | ed6e1d0 | 2011-07-21 12:36:55 +0800 | [diff] [blame] | 125 | iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr, |
| 126 | iprtd->period_bytes * iprtd->periods, |
| 127 | iprtd->period_bytes, |
| 128 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? |
Shawn Guo | d6077c9 | 2011-12-14 15:47:46 +0800 | [diff] [blame] | 129 | DMA_MEM_TO_DEV : DMA_DEV_TO_MEM); |
Dong Aisheng | ed6e1d0 | 2011-07-21 12:36:55 +0800 | [diff] [blame] | 130 | if (!iprtd->desc) { |
| 131 | dev_err(&chan->dev->device, "cannot prepare slave dma\n"); |
| 132 | return -EINVAL; |
| 133 | } |
| 134 | |
| 135 | iprtd->desc->callback = audio_dma_irq; |
| 136 | iprtd->desc->callback_param = substream; |
| 137 | |
| 138 | return 0; |
| 139 | } |
| 140 | |
Dong Aisheng | ed6e1d0 | 2011-07-21 12:36:55 +0800 | [diff] [blame] | 141 | static int snd_mxs_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| 142 | { |
| 143 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 144 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; |
| 145 | |
| 146 | switch (cmd) { |
| 147 | case SNDRV_PCM_TRIGGER_START: |
| 148 | case SNDRV_PCM_TRIGGER_RESUME: |
| 149 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 150 | dmaengine_submit(iprtd->desc); |
| 151 | |
| 152 | break; |
| 153 | case SNDRV_PCM_TRIGGER_STOP: |
| 154 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 155 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 156 | dmaengine_terminate_all(iprtd->dma_chan); |
| 157 | |
| 158 | break; |
| 159 | default: |
| 160 | return -EINVAL; |
| 161 | } |
| 162 | |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | static snd_pcm_uframes_t snd_mxs_pcm_pointer( |
| 167 | struct snd_pcm_substream *substream) |
| 168 | { |
| 169 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 170 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; |
| 171 | |
| 172 | return bytes_to_frames(substream->runtime, iprtd->offset); |
| 173 | } |
| 174 | |
| 175 | static int snd_mxs_open(struct snd_pcm_substream *substream) |
| 176 | { |
| 177 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 178 | struct mxs_pcm_runtime_data *iprtd; |
| 179 | int ret; |
| 180 | |
| 181 | iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); |
| 182 | if (iprtd == NULL) |
| 183 | return -ENOMEM; |
| 184 | runtime->private_data = iprtd; |
| 185 | |
| 186 | ret = snd_pcm_hw_constraint_integer(substream->runtime, |
| 187 | SNDRV_PCM_HW_PARAM_PERIODS); |
| 188 | if (ret < 0) { |
| 189 | kfree(iprtd); |
| 190 | return ret; |
| 191 | } |
| 192 | |
Lars-Peter Clausen | 95a771c | 2012-02-22 10:49:07 +0100 | [diff] [blame^] | 193 | ret = mxs_dma_alloc(substream); |
| 194 | if (ret) { |
| 195 | kfree(iprtd); |
| 196 | return ret; |
| 197 | } |
| 198 | |
Dong Aisheng | ed6e1d0 | 2011-07-21 12:36:55 +0800 | [diff] [blame] | 199 | snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware); |
| 200 | |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | static int snd_mxs_close(struct snd_pcm_substream *substream) |
| 205 | { |
| 206 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 207 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; |
| 208 | |
Lars-Peter Clausen | 95a771c | 2012-02-22 10:49:07 +0100 | [diff] [blame^] | 209 | dma_release_channel(iprtd->dma_chan); |
Dong Aisheng | ed6e1d0 | 2011-07-21 12:36:55 +0800 | [diff] [blame] | 210 | kfree(iprtd); |
| 211 | |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream, |
| 216 | struct vm_area_struct *vma) |
| 217 | { |
| 218 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 219 | |
| 220 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, |
| 221 | runtime->dma_area, |
| 222 | runtime->dma_addr, |
| 223 | runtime->dma_bytes); |
| 224 | } |
| 225 | |
| 226 | static struct snd_pcm_ops mxs_pcm_ops = { |
| 227 | .open = snd_mxs_open, |
| 228 | .close = snd_mxs_close, |
| 229 | .ioctl = snd_pcm_lib_ioctl, |
| 230 | .hw_params = snd_mxs_pcm_hw_params, |
Dong Aisheng | ed6e1d0 | 2011-07-21 12:36:55 +0800 | [diff] [blame] | 231 | .trigger = snd_mxs_pcm_trigger, |
| 232 | .pointer = snd_mxs_pcm_pointer, |
| 233 | .mmap = snd_mxs_pcm_mmap, |
| 234 | }; |
| 235 | |
| 236 | static int mxs_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
| 237 | { |
| 238 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; |
| 239 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
| 240 | size_t size = snd_mxs_hardware.buffer_bytes_max; |
| 241 | |
| 242 | buf->dev.type = SNDRV_DMA_TYPE_DEV; |
| 243 | buf->dev.dev = pcm->card->dev; |
| 244 | buf->private_data = NULL; |
| 245 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, |
| 246 | &buf->addr, GFP_KERNEL); |
| 247 | if (!buf->area) |
| 248 | return -ENOMEM; |
| 249 | buf->bytes = size; |
| 250 | |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | static u64 mxs_pcm_dmamask = DMA_BIT_MASK(32); |
| 255 | static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd) |
| 256 | { |
| 257 | struct snd_card *card = rtd->card->snd_card; |
| 258 | struct snd_pcm *pcm = rtd->pcm; |
| 259 | int ret = 0; |
| 260 | |
| 261 | if (!card->dev->dma_mask) |
| 262 | card->dev->dma_mask = &mxs_pcm_dmamask; |
| 263 | if (!card->dev->coherent_dma_mask) |
| 264 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); |
| 265 | |
| 266 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { |
| 267 | ret = mxs_pcm_preallocate_dma_buffer(pcm, |
| 268 | SNDRV_PCM_STREAM_PLAYBACK); |
| 269 | if (ret) |
| 270 | goto out; |
| 271 | } |
| 272 | |
| 273 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { |
| 274 | ret = mxs_pcm_preallocate_dma_buffer(pcm, |
| 275 | SNDRV_PCM_STREAM_CAPTURE); |
| 276 | if (ret) |
| 277 | goto out; |
| 278 | } |
| 279 | |
| 280 | out: |
| 281 | return ret; |
| 282 | } |
| 283 | |
| 284 | static void mxs_pcm_free(struct snd_pcm *pcm) |
| 285 | { |
| 286 | struct snd_pcm_substream *substream; |
| 287 | struct snd_dma_buffer *buf; |
| 288 | int stream; |
| 289 | |
| 290 | for (stream = 0; stream < 2; stream++) { |
| 291 | substream = pcm->streams[stream].substream; |
| 292 | if (!substream) |
| 293 | continue; |
| 294 | |
| 295 | buf = &substream->dma_buffer; |
| 296 | if (!buf->area) |
| 297 | continue; |
| 298 | |
| 299 | dma_free_writecombine(pcm->card->dev, buf->bytes, |
| 300 | buf->area, buf->addr); |
| 301 | buf->area = NULL; |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | static struct snd_soc_platform_driver mxs_soc_platform = { |
| 306 | .ops = &mxs_pcm_ops, |
| 307 | .pcm_new = mxs_pcm_new, |
| 308 | .pcm_free = mxs_pcm_free, |
| 309 | }; |
| 310 | |
| 311 | static int __devinit mxs_soc_platform_probe(struct platform_device *pdev) |
| 312 | { |
| 313 | return snd_soc_register_platform(&pdev->dev, &mxs_soc_platform); |
| 314 | } |
| 315 | |
| 316 | static int __devexit mxs_soc_platform_remove(struct platform_device *pdev) |
| 317 | { |
| 318 | snd_soc_unregister_platform(&pdev->dev); |
| 319 | |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | static struct platform_driver mxs_pcm_driver = { |
| 324 | .driver = { |
| 325 | .name = "mxs-pcm-audio", |
| 326 | .owner = THIS_MODULE, |
| 327 | }, |
| 328 | .probe = mxs_soc_platform_probe, |
| 329 | .remove = __devexit_p(mxs_soc_platform_remove), |
| 330 | }; |
| 331 | |
Axel Lin | 85aa096 | 2011-11-24 14:21:29 +0800 | [diff] [blame] | 332 | module_platform_driver(mxs_pcm_driver); |
Lothar Waßmann | 06c8eb9 | 2011-12-09 14:38:11 +0100 | [diff] [blame] | 333 | |
| 334 | MODULE_LICENSE("GPL"); |
Lothar Waßmann | 9fd369b | 2011-12-09 14:38:12 +0100 | [diff] [blame] | 335 | MODULE_ALIAS("platform:mxs-pcm-audio"); |