Ryan Mallon | db5bf41 | 2010-06-04 17:11:24 +1200 | [diff] [blame] | 1 | /* |
| 2 | * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface |
| 3 | * |
| 4 | * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org> |
| 5 | * Copyright (C) 2006 Applied Data Systems |
| 6 | * |
| 7 | * Rewritten for the SoC audio subsystem (Based on PXA2xx code): |
| 8 | * Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/dma-mapping.h> |
| 20 | |
| 21 | #include <sound/core.h> |
| 22 | #include <sound/pcm.h> |
| 23 | #include <sound/pcm_params.h> |
| 24 | #include <sound/soc.h> |
| 25 | |
| 26 | #include <mach/dma.h> |
| 27 | #include <mach/hardware.h> |
| 28 | #include <mach/ep93xx-regs.h> |
| 29 | |
| 30 | #include "ep93xx-pcm.h" |
| 31 | |
| 32 | static const struct snd_pcm_hardware ep93xx_pcm_hardware = { |
| 33 | .info = (SNDRV_PCM_INFO_MMAP | |
| 34 | SNDRV_PCM_INFO_MMAP_VALID | |
| 35 | SNDRV_PCM_INFO_INTERLEAVED | |
| 36 | SNDRV_PCM_INFO_BLOCK_TRANSFER), |
| 37 | |
Alexander Sverdlin | 4cfeb69 | 2011-03-07 20:30:12 +0300 | [diff] [blame] | 38 | .rates = SNDRV_PCM_RATE_8000_192000, |
Ryan Mallon | db5bf41 | 2010-06-04 17:11:24 +1200 | [diff] [blame] | 39 | .rate_min = SNDRV_PCM_RATE_8000, |
Alexander Sverdlin | 4cfeb69 | 2011-03-07 20:30:12 +0300 | [diff] [blame] | 40 | .rate_max = SNDRV_PCM_RATE_192000, |
Ryan Mallon | db5bf41 | 2010-06-04 17:11:24 +1200 | [diff] [blame] | 41 | |
| 42 | .formats = (SNDRV_PCM_FMTBIT_S16_LE | |
| 43 | SNDRV_PCM_FMTBIT_S24_LE | |
| 44 | SNDRV_PCM_FMTBIT_S32_LE), |
| 45 | |
| 46 | .buffer_bytes_max = 131072, |
| 47 | .period_bytes_min = 32, |
| 48 | .period_bytes_max = 32768, |
| 49 | .periods_min = 1, |
| 50 | .periods_max = 32, |
| 51 | .fifo_size = 32, |
| 52 | }; |
| 53 | |
| 54 | struct ep93xx_runtime_data |
| 55 | { |
| 56 | struct ep93xx_dma_m2p_client cl; |
| 57 | struct ep93xx_pcm_dma_params *params; |
| 58 | int pointer_bytes; |
| 59 | struct tasklet_struct period_tasklet; |
| 60 | int periods; |
| 61 | struct ep93xx_dma_buffer buf[32]; |
| 62 | }; |
| 63 | |
| 64 | static void ep93xx_pcm_period_elapsed(unsigned long data) |
| 65 | { |
| 66 | struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data; |
| 67 | snd_pcm_period_elapsed(substream); |
| 68 | } |
| 69 | |
| 70 | static void ep93xx_pcm_buffer_started(void *cookie, |
| 71 | struct ep93xx_dma_buffer *buf) |
| 72 | { |
| 73 | } |
| 74 | |
| 75 | static void ep93xx_pcm_buffer_finished(void *cookie, |
| 76 | struct ep93xx_dma_buffer *buf, |
| 77 | int bytes, int error) |
| 78 | { |
| 79 | struct snd_pcm_substream *substream = cookie; |
| 80 | struct ep93xx_runtime_data *rtd = substream->runtime->private_data; |
| 81 | |
| 82 | if (buf == rtd->buf + rtd->periods - 1) |
| 83 | rtd->pointer_bytes = 0; |
| 84 | else |
| 85 | rtd->pointer_bytes += buf->size; |
| 86 | |
| 87 | if (!error) { |
| 88 | ep93xx_dma_m2p_submit_recursive(&rtd->cl, buf); |
| 89 | tasklet_schedule(&rtd->period_tasklet); |
| 90 | } else { |
| 91 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | static int ep93xx_pcm_open(struct snd_pcm_substream *substream) |
| 96 | { |
| 97 | struct snd_soc_pcm_runtime *soc_rtd = substream->private_data; |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 98 | struct snd_soc_dai *cpu_dai = soc_rtd->cpu_dai; |
Ryan Mallon | db5bf41 | 2010-06-04 17:11:24 +1200 | [diff] [blame] | 99 | struct ep93xx_pcm_dma_params *dma_params; |
| 100 | struct ep93xx_runtime_data *rtd; |
| 101 | int ret; |
| 102 | |
| 103 | dma_params = snd_soc_dai_get_dma_data(cpu_dai, substream); |
| 104 | snd_soc_set_runtime_hwparams(substream, &ep93xx_pcm_hardware); |
| 105 | |
| 106 | rtd = kmalloc(sizeof(*rtd), GFP_KERNEL); |
| 107 | if (!rtd) |
| 108 | return -ENOMEM; |
| 109 | |
| 110 | memset(&rtd->period_tasklet, 0, sizeof(rtd->period_tasklet)); |
| 111 | rtd->period_tasklet.func = ep93xx_pcm_period_elapsed; |
| 112 | rtd->period_tasklet.data = (unsigned long)substream; |
| 113 | |
| 114 | rtd->cl.name = dma_params->name; |
| 115 | rtd->cl.flags = dma_params->dma_port | EP93XX_DMA_M2P_IGNORE_ERROR | |
| 116 | ((substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? |
| 117 | EP93XX_DMA_M2P_TX : EP93XX_DMA_M2P_RX); |
| 118 | rtd->cl.cookie = substream; |
| 119 | rtd->cl.buffer_started = ep93xx_pcm_buffer_started; |
| 120 | rtd->cl.buffer_finished = ep93xx_pcm_buffer_finished; |
| 121 | ret = ep93xx_dma_m2p_client_register(&rtd->cl); |
| 122 | if (ret < 0) { |
| 123 | kfree(rtd); |
| 124 | return ret; |
| 125 | } |
| 126 | |
| 127 | substream->runtime->private_data = rtd; |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static int ep93xx_pcm_close(struct snd_pcm_substream *substream) |
| 132 | { |
| 133 | struct ep93xx_runtime_data *rtd = substream->runtime->private_data; |
| 134 | |
| 135 | ep93xx_dma_m2p_client_unregister(&rtd->cl); |
| 136 | kfree(rtd); |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | static int ep93xx_pcm_hw_params(struct snd_pcm_substream *substream, |
| 141 | struct snd_pcm_hw_params *params) |
| 142 | { |
| 143 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 144 | struct ep93xx_runtime_data *rtd = runtime->private_data; |
| 145 | size_t totsize = params_buffer_bytes(params); |
| 146 | size_t period = params_period_bytes(params); |
| 147 | int i; |
| 148 | |
| 149 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| 150 | runtime->dma_bytes = totsize; |
| 151 | |
| 152 | rtd->periods = (totsize + period - 1) / period; |
| 153 | for (i = 0; i < rtd->periods; i++) { |
| 154 | rtd->buf[i].bus_addr = runtime->dma_addr + (i * period); |
| 155 | rtd->buf[i].size = period; |
| 156 | if ((i + 1) * period > totsize) |
| 157 | rtd->buf[i].size = totsize - (i * period); |
| 158 | } |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | static int ep93xx_pcm_hw_free(struct snd_pcm_substream *substream) |
| 164 | { |
| 165 | snd_pcm_set_runtime_buffer(substream, NULL); |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static int ep93xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| 170 | { |
| 171 | struct ep93xx_runtime_data *rtd = substream->runtime->private_data; |
| 172 | int ret; |
| 173 | int i; |
| 174 | |
| 175 | ret = 0; |
| 176 | switch (cmd) { |
| 177 | case SNDRV_PCM_TRIGGER_START: |
| 178 | case SNDRV_PCM_TRIGGER_RESUME: |
| 179 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 180 | rtd->pointer_bytes = 0; |
| 181 | for (i = 0; i < rtd->periods; i++) |
| 182 | ep93xx_dma_m2p_submit(&rtd->cl, rtd->buf + i); |
| 183 | break; |
| 184 | |
| 185 | case SNDRV_PCM_TRIGGER_STOP: |
| 186 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 187 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 188 | ep93xx_dma_m2p_flush(&rtd->cl); |
| 189 | break; |
| 190 | |
| 191 | default: |
| 192 | ret = -EINVAL; |
| 193 | break; |
| 194 | } |
| 195 | |
| 196 | return ret; |
| 197 | } |
| 198 | |
| 199 | static snd_pcm_uframes_t ep93xx_pcm_pointer(struct snd_pcm_substream *substream) |
| 200 | { |
| 201 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 202 | struct ep93xx_runtime_data *rtd = substream->runtime->private_data; |
| 203 | |
| 204 | /* FIXME: implement this with sub-period granularity */ |
| 205 | return bytes_to_frames(runtime, rtd->pointer_bytes); |
| 206 | } |
| 207 | |
| 208 | static int ep93xx_pcm_mmap(struct snd_pcm_substream *substream, |
| 209 | struct vm_area_struct *vma) |
| 210 | { |
| 211 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 212 | |
| 213 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, |
| 214 | runtime->dma_area, |
| 215 | runtime->dma_addr, |
| 216 | runtime->dma_bytes); |
| 217 | } |
| 218 | |
| 219 | static struct snd_pcm_ops ep93xx_pcm_ops = { |
| 220 | .open = ep93xx_pcm_open, |
| 221 | .close = ep93xx_pcm_close, |
| 222 | .ioctl = snd_pcm_lib_ioctl, |
| 223 | .hw_params = ep93xx_pcm_hw_params, |
| 224 | .hw_free = ep93xx_pcm_hw_free, |
| 225 | .trigger = ep93xx_pcm_trigger, |
| 226 | .pointer = ep93xx_pcm_pointer, |
| 227 | .mmap = ep93xx_pcm_mmap, |
| 228 | }; |
| 229 | |
| 230 | static int ep93xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
| 231 | { |
| 232 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; |
| 233 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
| 234 | size_t size = ep93xx_pcm_hardware.buffer_bytes_max; |
| 235 | |
| 236 | buf->dev.type = SNDRV_DMA_TYPE_DEV; |
| 237 | buf->dev.dev = pcm->card->dev; |
| 238 | buf->private_data = NULL; |
| 239 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, |
| 240 | &buf->addr, GFP_KERNEL); |
| 241 | buf->bytes = size; |
| 242 | |
| 243 | return (buf->area == NULL) ? -ENOMEM : 0; |
| 244 | } |
| 245 | |
| 246 | static void ep93xx_pcm_free_dma_buffers(struct snd_pcm *pcm) |
| 247 | { |
| 248 | struct snd_pcm_substream *substream; |
| 249 | struct snd_dma_buffer *buf; |
| 250 | int stream; |
| 251 | |
| 252 | for (stream = 0; stream < 2; stream++) { |
| 253 | substream = pcm->streams[stream].substream; |
| 254 | if (!substream) |
| 255 | continue; |
| 256 | |
| 257 | buf = &substream->dma_buffer; |
| 258 | if (!buf->area) |
| 259 | continue; |
| 260 | |
| 261 | dma_free_writecombine(pcm->card->dev, buf->bytes, buf->area, |
| 262 | buf->addr); |
| 263 | buf->area = NULL; |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | static u64 ep93xx_pcm_dmamask = 0xffffffff; |
| 268 | |
| 269 | static int ep93xx_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, |
| 270 | struct snd_pcm *pcm) |
| 271 | { |
| 272 | int ret = 0; |
| 273 | |
| 274 | if (!card->dev->dma_mask) |
| 275 | card->dev->dma_mask = &ep93xx_pcm_dmamask; |
| 276 | if (!card->dev->coherent_dma_mask) |
| 277 | card->dev->coherent_dma_mask = 0xffffffff; |
| 278 | |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 279 | if (dai->driver->playback.channels_min) { |
Ryan Mallon | db5bf41 | 2010-06-04 17:11:24 +1200 | [diff] [blame] | 280 | ret = ep93xx_pcm_preallocate_dma_buffer(pcm, |
| 281 | SNDRV_PCM_STREAM_PLAYBACK); |
| 282 | if (ret) |
| 283 | return ret; |
| 284 | } |
| 285 | |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 286 | if (dai->driver->capture.channels_min) { |
Ryan Mallon | db5bf41 | 2010-06-04 17:11:24 +1200 | [diff] [blame] | 287 | ret = ep93xx_pcm_preallocate_dma_buffer(pcm, |
| 288 | SNDRV_PCM_STREAM_CAPTURE); |
| 289 | if (ret) |
| 290 | return ret; |
| 291 | } |
| 292 | |
| 293 | return 0; |
| 294 | } |
| 295 | |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 296 | static struct snd_soc_platform_driver ep93xx_soc_platform = { |
| 297 | .ops = &ep93xx_pcm_ops, |
Ryan Mallon | db5bf41 | 2010-06-04 17:11:24 +1200 | [diff] [blame] | 298 | .pcm_new = &ep93xx_pcm_new, |
| 299 | .pcm_free = &ep93xx_pcm_free_dma_buffers, |
| 300 | }; |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 301 | |
| 302 | static int __devinit ep93xx_soc_platform_probe(struct platform_device *pdev) |
| 303 | { |
| 304 | return snd_soc_register_platform(&pdev->dev, &ep93xx_soc_platform); |
| 305 | } |
| 306 | |
| 307 | static int __devexit ep93xx_soc_platform_remove(struct platform_device *pdev) |
| 308 | { |
| 309 | snd_soc_unregister_platform(&pdev->dev); |
| 310 | return 0; |
| 311 | } |
| 312 | |
| 313 | static struct platform_driver ep93xx_pcm_driver = { |
| 314 | .driver = { |
| 315 | .name = "ep93xx-pcm-audio", |
| 316 | .owner = THIS_MODULE, |
| 317 | }, |
| 318 | |
| 319 | .probe = ep93xx_soc_platform_probe, |
| 320 | .remove = __devexit_p(ep93xx_soc_platform_remove), |
| 321 | }; |
Ryan Mallon | db5bf41 | 2010-06-04 17:11:24 +1200 | [diff] [blame] | 322 | |
| 323 | static int __init ep93xx_soc_platform_init(void) |
| 324 | { |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 325 | return platform_driver_register(&ep93xx_pcm_driver); |
Ryan Mallon | db5bf41 | 2010-06-04 17:11:24 +1200 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | static void __exit ep93xx_soc_platform_exit(void) |
| 329 | { |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 330 | platform_driver_unregister(&ep93xx_pcm_driver); |
Ryan Mallon | db5bf41 | 2010-06-04 17:11:24 +1200 | [diff] [blame] | 331 | } |
| 332 | |
| 333 | module_init(ep93xx_soc_platform_init); |
| 334 | module_exit(ep93xx_soc_platform_exit); |
| 335 | |
| 336 | MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com>"); |
| 337 | MODULE_DESCRIPTION("EP93xx ALSA PCM interface"); |
| 338 | MODULE_LICENSE("GPL"); |