Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License as published by the |
| 6 | * Free Software Foundation; either version 2 of the License, or (at your |
| 7 | * option) any later version. |
| 8 | * |
| 9 | * You should have received a copy of the GNU General Public License along |
| 10 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 11 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/platform_device.h> |
| 20 | #include <linux/slab.h> |
| 21 | |
| 22 | #include <linux/dma-mapping.h> |
| 23 | |
| 24 | #include <sound/core.h> |
| 25 | #include <sound/pcm.h> |
| 26 | #include <sound/pcm_params.h> |
| 27 | #include <sound/soc.h> |
| 28 | |
| 29 | #include <asm/mach-jz4740/dma.h> |
| 30 | #include "jz4740-pcm.h" |
| 31 | |
| 32 | struct jz4740_runtime_data { |
| 33 | unsigned long dma_period; |
| 34 | dma_addr_t dma_start; |
| 35 | dma_addr_t dma_pos; |
| 36 | dma_addr_t dma_end; |
| 37 | |
| 38 | struct jz4740_dma_chan *dma; |
| 39 | |
| 40 | dma_addr_t fifo_addr; |
| 41 | }; |
| 42 | |
| 43 | /* identify hardware playback capabilities */ |
| 44 | static const struct snd_pcm_hardware jz4740_pcm_hardware = { |
| 45 | .info = SNDRV_PCM_INFO_MMAP | |
| 46 | SNDRV_PCM_INFO_MMAP_VALID | |
| 47 | SNDRV_PCM_INFO_INTERLEAVED | |
| 48 | SNDRV_PCM_INFO_BLOCK_TRANSFER, |
| 49 | .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8, |
| 50 | |
| 51 | .rates = SNDRV_PCM_RATE_8000_48000, |
| 52 | .channels_min = 1, |
| 53 | .channels_max = 2, |
| 54 | .period_bytes_min = 16, |
| 55 | .period_bytes_max = 2 * PAGE_SIZE, |
| 56 | .periods_min = 2, |
| 57 | .periods_max = 128, |
| 58 | .buffer_bytes_max = 128 * 2 * PAGE_SIZE, |
| 59 | .fifo_size = 32, |
| 60 | }; |
| 61 | |
| 62 | static void jz4740_pcm_start_transfer(struct jz4740_runtime_data *prtd, |
| 63 | struct snd_pcm_substream *substream) |
| 64 | { |
| 65 | unsigned long count; |
| 66 | |
| 67 | if (prtd->dma_pos == prtd->dma_end) |
| 68 | prtd->dma_pos = prtd->dma_start; |
| 69 | |
| 70 | if (prtd->dma_pos + prtd->dma_period > prtd->dma_end) |
| 71 | count = prtd->dma_end - prtd->dma_pos; |
| 72 | else |
| 73 | count = prtd->dma_period; |
| 74 | |
| 75 | jz4740_dma_disable(prtd->dma); |
| 76 | |
| 77 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| 78 | jz4740_dma_set_src_addr(prtd->dma, prtd->dma_pos); |
| 79 | jz4740_dma_set_dst_addr(prtd->dma, prtd->fifo_addr); |
| 80 | } else { |
| 81 | jz4740_dma_set_src_addr(prtd->dma, prtd->fifo_addr); |
| 82 | jz4740_dma_set_dst_addr(prtd->dma, prtd->dma_pos); |
| 83 | } |
| 84 | |
| 85 | jz4740_dma_set_transfer_count(prtd->dma, count); |
| 86 | |
| 87 | prtd->dma_pos += count; |
| 88 | |
| 89 | jz4740_dma_enable(prtd->dma); |
| 90 | } |
| 91 | |
| 92 | static void jz4740_pcm_dma_transfer_done(struct jz4740_dma_chan *dma, int err, |
| 93 | void *dev_id) |
| 94 | { |
| 95 | struct snd_pcm_substream *substream = dev_id; |
| 96 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 97 | struct jz4740_runtime_data *prtd = runtime->private_data; |
| 98 | |
| 99 | snd_pcm_period_elapsed(substream); |
| 100 | |
| 101 | jz4740_pcm_start_transfer(prtd, substream); |
| 102 | } |
| 103 | |
| 104 | static int jz4740_pcm_hw_params(struct snd_pcm_substream *substream, |
| 105 | struct snd_pcm_hw_params *params) |
| 106 | { |
| 107 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 108 | struct jz4740_runtime_data *prtd = runtime->private_data; |
| 109 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 110 | struct jz4740_pcm_config *config; |
| 111 | |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 112 | config = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 113 | |
| 114 | if (!config) |
| 115 | return 0; |
| 116 | |
| 117 | if (!prtd->dma) { |
| 118 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) |
| 119 | prtd->dma = jz4740_dma_request(substream, "PCM Capture"); |
| 120 | else |
| 121 | prtd->dma = jz4740_dma_request(substream, "PCM Playback"); |
| 122 | } |
| 123 | |
| 124 | if (!prtd->dma) |
| 125 | return -EBUSY; |
| 126 | |
| 127 | jz4740_dma_configure(prtd->dma, &config->dma_config); |
| 128 | prtd->fifo_addr = config->fifo_addr; |
| 129 | |
| 130 | jz4740_dma_set_complete_cb(prtd->dma, jz4740_pcm_dma_transfer_done); |
| 131 | |
| 132 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| 133 | runtime->dma_bytes = params_buffer_bytes(params); |
| 134 | |
| 135 | prtd->dma_period = params_period_bytes(params); |
| 136 | prtd->dma_start = runtime->dma_addr; |
| 137 | prtd->dma_pos = prtd->dma_start; |
| 138 | prtd->dma_end = prtd->dma_start + runtime->dma_bytes; |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | static int jz4740_pcm_hw_free(struct snd_pcm_substream *substream) |
| 144 | { |
| 145 | struct jz4740_runtime_data *prtd = substream->runtime->private_data; |
| 146 | |
| 147 | snd_pcm_set_runtime_buffer(substream, NULL); |
| 148 | if (prtd->dma) { |
| 149 | jz4740_dma_free(prtd->dma); |
| 150 | prtd->dma = NULL; |
| 151 | } |
| 152 | |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | static int jz4740_pcm_prepare(struct snd_pcm_substream *substream) |
| 157 | { |
| 158 | struct jz4740_runtime_data *prtd = substream->runtime->private_data; |
| 159 | |
| 160 | if (!prtd->dma) |
| 161 | return -EBUSY; |
| 162 | |
| 163 | prtd->dma_pos = prtd->dma_start; |
| 164 | |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | static int jz4740_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| 169 | { |
| 170 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 171 | struct jz4740_runtime_data *prtd = runtime->private_data; |
| 172 | |
| 173 | switch (cmd) { |
| 174 | case SNDRV_PCM_TRIGGER_START: |
| 175 | case SNDRV_PCM_TRIGGER_RESUME: |
| 176 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 177 | jz4740_pcm_start_transfer(prtd, substream); |
| 178 | break; |
| 179 | case SNDRV_PCM_TRIGGER_STOP: |
| 180 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 181 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 182 | jz4740_dma_disable(prtd->dma); |
| 183 | break; |
| 184 | default: |
| 185 | break; |
| 186 | } |
| 187 | |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | static snd_pcm_uframes_t jz4740_pcm_pointer(struct snd_pcm_substream *substream) |
| 192 | { |
| 193 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 194 | struct jz4740_runtime_data *prtd = runtime->private_data; |
| 195 | unsigned long byte_offset; |
| 196 | snd_pcm_uframes_t offset; |
| 197 | struct jz4740_dma_chan *dma = prtd->dma; |
| 198 | |
| 199 | /* prtd->dma_pos points to the end of the current transfer. So by |
| 200 | * subtracting prdt->dma_start we get the offset to the end of the |
| 201 | * current period in bytes. By subtracting the residue of the transfer |
| 202 | * we get the current offset in bytes. */ |
| 203 | byte_offset = prtd->dma_pos - prtd->dma_start; |
| 204 | byte_offset -= jz4740_dma_get_residue(dma); |
| 205 | |
| 206 | offset = bytes_to_frames(runtime, byte_offset); |
| 207 | if (offset >= runtime->buffer_size) |
| 208 | offset = 0; |
| 209 | |
| 210 | return offset; |
| 211 | } |
| 212 | |
| 213 | static int jz4740_pcm_open(struct snd_pcm_substream *substream) |
| 214 | { |
| 215 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 216 | struct jz4740_runtime_data *prtd; |
| 217 | |
| 218 | prtd = kzalloc(sizeof(*prtd), GFP_KERNEL); |
| 219 | if (prtd == NULL) |
| 220 | return -ENOMEM; |
| 221 | |
| 222 | snd_soc_set_runtime_hwparams(substream, &jz4740_pcm_hardware); |
| 223 | |
| 224 | runtime->private_data = prtd; |
| 225 | |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | static int jz4740_pcm_close(struct snd_pcm_substream *substream) |
| 230 | { |
| 231 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 232 | struct jz4740_runtime_data *prtd = runtime->private_data; |
| 233 | |
| 234 | kfree(prtd); |
| 235 | |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | static int jz4740_pcm_mmap(struct snd_pcm_substream *substream, |
| 240 | struct vm_area_struct *vma) |
| 241 | { |
| 242 | return remap_pfn_range(vma, vma->vm_start, |
| 243 | substream->dma_buffer.addr >> PAGE_SHIFT, |
| 244 | vma->vm_end - vma->vm_start, vma->vm_page_prot); |
| 245 | } |
| 246 | |
| 247 | static struct snd_pcm_ops jz4740_pcm_ops = { |
| 248 | .open = jz4740_pcm_open, |
| 249 | .close = jz4740_pcm_close, |
| 250 | .ioctl = snd_pcm_lib_ioctl, |
| 251 | .hw_params = jz4740_pcm_hw_params, |
| 252 | .hw_free = jz4740_pcm_hw_free, |
| 253 | .prepare = jz4740_pcm_prepare, |
| 254 | .trigger = jz4740_pcm_trigger, |
| 255 | .pointer = jz4740_pcm_pointer, |
| 256 | .mmap = jz4740_pcm_mmap, |
| 257 | }; |
| 258 | |
| 259 | static int jz4740_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
| 260 | { |
| 261 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; |
| 262 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
| 263 | size_t size = jz4740_pcm_hardware.buffer_bytes_max; |
| 264 | |
| 265 | buf->dev.type = SNDRV_DMA_TYPE_DEV; |
| 266 | buf->dev.dev = pcm->card->dev; |
| 267 | buf->private_data = NULL; |
| 268 | |
| 269 | buf->area = dma_alloc_noncoherent(pcm->card->dev, size, |
| 270 | &buf->addr, GFP_KERNEL); |
| 271 | if (!buf->area) |
| 272 | return -ENOMEM; |
| 273 | |
| 274 | buf->bytes = size; |
| 275 | |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | static void jz4740_pcm_free(struct snd_pcm *pcm) |
| 280 | { |
| 281 | struct snd_pcm_substream *substream; |
| 282 | struct snd_dma_buffer *buf; |
| 283 | int stream; |
| 284 | |
| 285 | for (stream = 0; stream < SNDRV_PCM_STREAM_LAST; ++stream) { |
| 286 | substream = pcm->streams[stream].substream; |
| 287 | if (!substream) |
| 288 | continue; |
| 289 | |
| 290 | buf = &substream->dma_buffer; |
| 291 | if (!buf->area) |
| 292 | continue; |
| 293 | |
| 294 | dma_free_noncoherent(pcm->card->dev, buf->bytes, buf->area, |
| 295 | buf->addr); |
| 296 | buf->area = NULL; |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | static u64 jz4740_pcm_dmamask = DMA_BIT_MASK(32); |
| 301 | |
Axel Lin | bb75463 | 2011-09-21 14:41:50 +0800 | [diff] [blame] | 302 | static int jz4740_pcm_new(struct snd_soc_pcm_runtime *rtd) |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 303 | { |
Liam Girdwood | 552d1ef | 2011-06-07 16:08:33 +0100 | [diff] [blame] | 304 | struct snd_card *card = rtd->card->snd_card; |
Liam Girdwood | 552d1ef | 2011-06-07 16:08:33 +0100 | [diff] [blame] | 305 | struct snd_pcm *pcm = rtd->pcm; |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 306 | int ret = 0; |
| 307 | |
| 308 | if (!card->dev->dma_mask) |
| 309 | card->dev->dma_mask = &jz4740_pcm_dmamask; |
| 310 | |
| 311 | if (!card->dev->coherent_dma_mask) |
| 312 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); |
| 313 | |
Joachim Eastwood | 25e9e75 | 2012-01-01 01:58:44 +0100 | [diff] [blame] | 314 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 315 | ret = jz4740_pcm_preallocate_dma_buffer(pcm, |
| 316 | SNDRV_PCM_STREAM_PLAYBACK); |
| 317 | if (ret) |
| 318 | goto err; |
| 319 | } |
| 320 | |
Joachim Eastwood | 25e9e75 | 2012-01-01 01:58:44 +0100 | [diff] [blame] | 321 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 322 | ret = jz4740_pcm_preallocate_dma_buffer(pcm, |
| 323 | SNDRV_PCM_STREAM_CAPTURE); |
| 324 | if (ret) |
| 325 | goto err; |
| 326 | } |
| 327 | |
| 328 | err: |
| 329 | return ret; |
| 330 | } |
| 331 | |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 332 | static struct snd_soc_platform_driver jz4740_soc_platform = { |
| 333 | .ops = &jz4740_pcm_ops, |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 334 | .pcm_new = jz4740_pcm_new, |
| 335 | .pcm_free = jz4740_pcm_free, |
| 336 | }; |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 337 | |
Bill Pemberton | d6a29e3 | 2012-12-07 09:26:24 -0500 | [diff] [blame] | 338 | static int jz4740_pcm_probe(struct platform_device *pdev) |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 339 | { |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 340 | return snd_soc_register_platform(&pdev->dev, &jz4740_soc_platform); |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 341 | } |
| 342 | |
Bill Pemberton | d6a29e3 | 2012-12-07 09:26:24 -0500 | [diff] [blame] | 343 | static int jz4740_pcm_remove(struct platform_device *pdev) |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 344 | { |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 345 | snd_soc_unregister_platform(&pdev->dev); |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | static struct platform_driver jz4740_pcm_driver = { |
| 350 | .probe = jz4740_pcm_probe, |
Bill Pemberton | d6a29e3 | 2012-12-07 09:26:24 -0500 | [diff] [blame] | 351 | .remove = jz4740_pcm_remove, |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 352 | .driver = { |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 353 | .name = "jz4740-pcm-audio", |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 354 | .owner = THIS_MODULE, |
| 355 | }, |
| 356 | }; |
| 357 | |
Axel Lin | c32986e | 2011-11-24 10:13:03 +0800 | [diff] [blame] | 358 | module_platform_driver(jz4740_pcm_driver); |
Lars-Peter Clausen | 11bd3dd | 2010-06-19 16:50:37 +0200 | [diff] [blame] | 359 | |
| 360 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
| 361 | MODULE_DESCRIPTION("Ingenic SoC JZ4740 PCM driver"); |
| 362 | MODULE_LICENSE("GPL"); |