1/* 2 * omap-pcm.c -- ALSA PCM interface for the OMAP SoC 3 * 4 * Copyright (C) 2008 Nokia Corporation 5 * 6 * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com> 7 * Peter Ujfalusi <peter.ujfalusi@ti.com> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * version 2 as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 21 * 02110-1301 USA 22 * 23 */ 24 25#include <linux/dma-mapping.h> 26#include <linux/slab.h> 27#include <linux/module.h> 28#include <linux/omap-dma.h> 29#include <sound/core.h> 30#include <sound/pcm.h> 31#include <sound/pcm_params.h> 32#include <sound/dmaengine_pcm.h> 33#include <sound/soc.h> 34#include <sound/omap-pcm.h> 35 36#ifdef CONFIG_ARCH_OMAP1 37#define pcm_omap1510() cpu_is_omap1510() 38#else 39#define pcm_omap1510() 0 40#endif 41 42static struct snd_pcm_hardware omap_pcm_hardware = { 43 .info = SNDRV_PCM_INFO_MMAP | 44 SNDRV_PCM_INFO_MMAP_VALID | 45 SNDRV_PCM_INFO_INTERLEAVED | 46 SNDRV_PCM_INFO_PAUSE | 47 SNDRV_PCM_INFO_RESUME | 48 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP, 49 .period_bytes_min = 32, 50 .period_bytes_max = 64 * 1024, 51 .periods_min = 2, 52 .periods_max = 255, 53 .buffer_bytes_max = 128 * 1024, 54}; 55 56/* sDMA supports only 1, 2, and 4 byte transfer elements. */ 57static void omap_pcm_limit_supported_formats(void) 58{ 59 int i; 60 61 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) { 62 switch (snd_pcm_format_physical_width(i)) { 63 case 8: 64 case 16: 65 case 32: 66 omap_pcm_hardware.formats |= (1LL << i); 67 break; 68 default: 69 break; 70 } 71 } 72} 73 74/* this may get called several times by oss emulation */ 75static int omap_pcm_hw_params(struct snd_pcm_substream *substream, 76 struct snd_pcm_hw_params *params) 77{ 78 struct snd_pcm_runtime *runtime = substream->runtime; 79 struct snd_soc_pcm_runtime *rtd = substream->private_data; 80 struct omap_pcm_dma_data *dma_data; 81 struct dma_slave_config config; 82 struct dma_chan *chan; 83 int err = 0; 84 85 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); 86 87 /* return if this is a bufferless transfer e.g. 88 * codec <--> BT codec or GSM modem -- lg FIXME */ 89 if (!dma_data) 90 return 0; 91 92 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 93 runtime->dma_bytes = params_buffer_bytes(params); 94 95 chan = snd_dmaengine_pcm_get_chan(substream); 96 if (!chan) 97 return -EINVAL; 98 99 /* fills in addr_width and direction */ 100 err = snd_hwparams_to_dma_slave_config(substream, params, &config); 101 if (err) 102 return err; 103 104 snd_dmaengine_pcm_set_config_from_dai_data(substream, 105 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream), 106 &config); 107 108 return dmaengine_slave_config(chan, &config); 109} 110 111static int omap_pcm_hw_free(struct snd_pcm_substream *substream) 112{ 113 snd_pcm_set_runtime_buffer(substream, NULL); 114 return 0; 115} 116 117static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream) 118{ 119 snd_pcm_uframes_t offset; 120 121 if (pcm_omap1510()) 122 offset = snd_dmaengine_pcm_pointer_no_residue(substream); 123 else 124 offset = snd_dmaengine_pcm_pointer(substream); 125 126 return offset; 127} 128 129static int omap_pcm_open(struct snd_pcm_substream *substream) 130{ 131 struct snd_soc_pcm_runtime *rtd = substream->private_data; 132 struct snd_dmaengine_dai_dma_data *dma_data; 133 int ret; 134 135 snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware); 136 137 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); 138 139 /* DT boot: filter_data is the DMA name */ 140 if (rtd->cpu_dai->dev->of_node) { 141 struct dma_chan *chan; 142 143 chan = dma_request_slave_channel(rtd->cpu_dai->dev, 144 dma_data->filter_data); 145 ret = snd_dmaengine_pcm_open(substream, chan); 146 } else { 147 ret = snd_dmaengine_pcm_open_request_chan(substream, 148 omap_dma_filter_fn, 149 dma_data->filter_data); 150 } 151 return ret; 152} 153 154static int omap_pcm_mmap(struct snd_pcm_substream *substream, 155 struct vm_area_struct *vma) 156{ 157 struct snd_pcm_runtime *runtime = substream->runtime; 158 159 return dma_mmap_writecombine(substream->pcm->card->dev, vma, 160 runtime->dma_area, 161 runtime->dma_addr, 162 runtime->dma_bytes); 163} 164 165static struct snd_pcm_ops omap_pcm_ops = { 166 .open = omap_pcm_open, 167 .close = snd_dmaengine_pcm_close_release_chan, 168 .ioctl = snd_pcm_lib_ioctl, 169 .hw_params = omap_pcm_hw_params, 170 .hw_free = omap_pcm_hw_free, 171 .trigger = snd_dmaengine_pcm_trigger, 172 .pointer = omap_pcm_pointer, 173 .mmap = omap_pcm_mmap, 174}; 175 176static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, 177 int stream) 178{ 179 struct snd_pcm_substream *substream = pcm->streams[stream].substream; 180 struct snd_dma_buffer *buf = &substream->dma_buffer; 181 size_t size = omap_pcm_hardware.buffer_bytes_max; 182 183 buf->dev.type = SNDRV_DMA_TYPE_DEV; 184 buf->dev.dev = pcm->card->dev; 185 buf->private_data = NULL; 186 buf->area = dma_alloc_writecombine(pcm->card->dev, size, 187 &buf->addr, GFP_KERNEL); 188 if (!buf->area) 189 return -ENOMEM; 190 191 buf->bytes = size; 192 return 0; 193} 194 195static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm) 196{ 197 struct snd_pcm_substream *substream; 198 struct snd_dma_buffer *buf; 199 int stream; 200 201 for (stream = 0; stream < 2; stream++) { 202 substream = pcm->streams[stream].substream; 203 if (!substream) 204 continue; 205 206 buf = &substream->dma_buffer; 207 if (!buf->area) 208 continue; 209 210 dma_free_writecombine(pcm->card->dev, buf->bytes, 211 buf->area, buf->addr); 212 buf->area = NULL; 213 } 214} 215 216static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd) 217{ 218 struct snd_card *card = rtd->card->snd_card; 219 struct snd_pcm *pcm = rtd->pcm; 220 int ret; 221 222 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 223 if (ret) 224 return ret; 225 226 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 227 ret = omap_pcm_preallocate_dma_buffer(pcm, 228 SNDRV_PCM_STREAM_PLAYBACK); 229 if (ret) 230 goto out; 231 } 232 233 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 234 ret = omap_pcm_preallocate_dma_buffer(pcm, 235 SNDRV_PCM_STREAM_CAPTURE); 236 if (ret) 237 goto out; 238 } 239 240out: 241 /* free preallocated buffers in case of error */ 242 if (ret) 243 omap_pcm_free_dma_buffers(pcm); 244 245 return ret; 246} 247 248static struct snd_soc_platform_driver omap_soc_platform = { 249 .ops = &omap_pcm_ops, 250 .pcm_new = omap_pcm_new, 251 .pcm_free = omap_pcm_free_dma_buffers, 252}; 253 254int omap_pcm_platform_register(struct device *dev) 255{ 256 omap_pcm_limit_supported_formats(); 257 return devm_snd_soc_register_platform(dev, &omap_soc_platform); 258} 259EXPORT_SYMBOL_GPL(omap_pcm_platform_register); 260 261MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>"); 262MODULE_DESCRIPTION("OMAP PCM DMA module"); 263MODULE_LICENSE("GPL"); 264