1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * tegra_pcm.c - Tegra PCM driver 4 * 5 * Author: Stephen Warren <swarren@nvidia.com> 6 * Copyright (C) 2010,2012 - NVIDIA, Inc. 7 * 8 * Based on code copyright/by: 9 * 10 * Copyright (c) 2009-2010, NVIDIA Corporation. 11 * Scott Peterson <speterson@nvidia.com> 12 * Vijay Mali <vmali@nvidia.com> 13 * 14 * Copyright (C) 2010 Google, Inc. 15 * Iliyan Malchev <malchev@google.com> 16 */ 17 18 #include <linux/module.h> 19 #include <linux/dma-mapping.h> 20 #include <sound/core.h> 21 #include <sound/pcm.h> 22 #include <sound/pcm_params.h> 23 #include <sound/soc.h> 24 #include <sound/dmaengine_pcm.h> 25 #include "tegra_pcm.h" 26 27 static const struct snd_pcm_hardware tegra_pcm_hardware = { 28 .info = SNDRV_PCM_INFO_MMAP | 29 SNDRV_PCM_INFO_MMAP_VALID | 30 SNDRV_PCM_INFO_INTERLEAVED, 31 .period_bytes_min = 1024, 32 .period_bytes_max = PAGE_SIZE, 33 .periods_min = 2, 34 .periods_max = 8, 35 .buffer_bytes_max = PAGE_SIZE * 8, 36 .fifo_size = 4, 37 }; 38 39 static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = { 40 .pcm_hardware = &tegra_pcm_hardware, 41 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, 42 .prealloc_buffer_size = PAGE_SIZE * 8, 43 }; 44 45 int tegra_pcm_platform_register(struct device *dev) 46 { 47 return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0); 48 } 49 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register); 50 51 int tegra_pcm_platform_register_with_chan_names(struct device *dev, 52 struct snd_dmaengine_pcm_config *config, 53 char *txdmachan, char *rxdmachan) 54 { 55 *config = tegra_dmaengine_pcm_config; 56 config->dma_dev = dev->parent; 57 config->chan_names[0] = txdmachan; 58 config->chan_names[1] = rxdmachan; 59 60 return snd_dmaengine_pcm_register(dev, config, 0); 61 } 62 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names); 63 64 void tegra_pcm_platform_unregister(struct device *dev) 65 { 66 return snd_dmaengine_pcm_unregister(dev); 67 } 68 EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister); 69 70 int tegra_pcm_open(struct snd_soc_component *component, 71 struct snd_pcm_substream *substream) 72 { 73 struct snd_soc_pcm_runtime *rtd = substream->private_data; 74 struct snd_dmaengine_dai_dma_data *dmap; 75 struct dma_chan *chan; 76 struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); 77 int ret; 78 79 if (rtd->dai_link->no_pcm) 80 return 0; 81 82 dmap = snd_soc_dai_get_dma_data(cpu_dai, substream); 83 84 /* Set HW params now that initialization is complete */ 85 snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware); 86 87 /* Ensure period size is multiple of 8 */ 88 ret = snd_pcm_hw_constraint_step(substream->runtime, 0, 89 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 0x8); 90 if (ret) { 91 dev_err(rtd->dev, "failed to set constraint %d\n", ret); 92 return ret; 93 } 94 95 chan = dma_request_slave_channel(cpu_dai->dev, dmap->chan_name); 96 if (!chan) { 97 dev_err(cpu_dai->dev, 98 "dmaengine request slave channel failed! (%s)\n", 99 dmap->chan_name); 100 return -ENODEV; 101 } 102 103 ret = snd_dmaengine_pcm_open(substream, chan); 104 if (ret) { 105 dev_err(rtd->dev, 106 "dmaengine pcm open failed with err %d (%s)\n", ret, 107 dmap->chan_name); 108 109 dma_release_channel(chan); 110 111 return ret; 112 } 113 114 return 0; 115 } 116 EXPORT_SYMBOL_GPL(tegra_pcm_open); 117 118 int tegra_pcm_close(struct snd_soc_component *component, 119 struct snd_pcm_substream *substream) 120 { 121 struct snd_soc_pcm_runtime *rtd = substream->private_data; 122 123 if (rtd->dai_link->no_pcm) 124 return 0; 125 126 snd_dmaengine_pcm_close_release_chan(substream); 127 128 return 0; 129 } 130 EXPORT_SYMBOL_GPL(tegra_pcm_close); 131 132 int tegra_pcm_hw_params(struct snd_soc_component *component, 133 struct snd_pcm_substream *substream, 134 struct snd_pcm_hw_params *params) 135 { 136 struct snd_soc_pcm_runtime *rtd = substream->private_data; 137 struct snd_dmaengine_dai_dma_data *dmap; 138 struct dma_slave_config slave_config; 139 struct dma_chan *chan; 140 int ret; 141 142 if (rtd->dai_link->no_pcm) 143 return 0; 144 145 dmap = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); 146 if (!dmap) 147 return 0; 148 149 chan = snd_dmaengine_pcm_get_chan(substream); 150 151 ret = snd_hwparams_to_dma_slave_config(substream, params, 152 &slave_config); 153 if (ret) { 154 dev_err(rtd->dev, "hw params config failed with err %d\n", ret); 155 return ret; 156 } 157 158 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 159 slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 160 slave_config.dst_addr = dmap->addr; 161 slave_config.dst_maxburst = 8; 162 } else { 163 slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 164 slave_config.src_addr = dmap->addr; 165 slave_config.src_maxburst = 8; 166 } 167 168 ret = dmaengine_slave_config(chan, &slave_config); 169 if (ret < 0) { 170 dev_err(rtd->dev, "dma slave config failed with err %d\n", ret); 171 return ret; 172 } 173 174 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 175 176 return 0; 177 } 178 EXPORT_SYMBOL_GPL(tegra_pcm_hw_params); 179 180 int tegra_pcm_hw_free(struct snd_soc_component *component, 181 struct snd_pcm_substream *substream) 182 { 183 struct snd_soc_pcm_runtime *rtd = substream->private_data; 184 185 if (rtd->dai_link->no_pcm) 186 return 0; 187 188 snd_pcm_set_runtime_buffer(substream, NULL); 189 190 return 0; 191 } 192 EXPORT_SYMBOL_GPL(tegra_pcm_hw_free); 193 194 int tegra_pcm_mmap(struct snd_soc_component *component, 195 struct snd_pcm_substream *substream, 196 struct vm_area_struct *vma) 197 { 198 struct snd_soc_pcm_runtime *rtd = substream->private_data; 199 struct snd_pcm_runtime *runtime = substream->runtime; 200 201 if (rtd->dai_link->no_pcm) 202 return 0; 203 204 return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area, 205 runtime->dma_addr, runtime->dma_bytes); 206 } 207 EXPORT_SYMBOL_GPL(tegra_pcm_mmap); 208 209 snd_pcm_uframes_t tegra_pcm_pointer(struct snd_soc_component *component, 210 struct snd_pcm_substream *substream) 211 { 212 return snd_dmaengine_pcm_pointer(substream); 213 } 214 EXPORT_SYMBOL_GPL(tegra_pcm_pointer); 215 216 static int tegra_pcm_preallocate_dma_buffer(struct device *dev, struct snd_pcm *pcm, int stream, 217 size_t size) 218 { 219 struct snd_pcm_substream *substream = pcm->streams[stream].substream; 220 struct snd_dma_buffer *buf = &substream->dma_buffer; 221 222 buf->area = dma_alloc_wc(dev, size, &buf->addr, GFP_KERNEL); 223 if (!buf->area) 224 return -ENOMEM; 225 226 buf->private_data = NULL; 227 buf->dev.type = SNDRV_DMA_TYPE_DEV; 228 buf->dev.dev = dev; 229 buf->bytes = size; 230 231 return 0; 232 } 233 234 static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream) 235 { 236 struct snd_pcm_substream *substream; 237 struct snd_dma_buffer *buf; 238 239 substream = pcm->streams[stream].substream; 240 if (!substream) 241 return; 242 243 buf = &substream->dma_buffer; 244 if (!buf->area) 245 return; 246 247 dma_free_wc(buf->dev.dev, buf->bytes, buf->area, buf->addr); 248 buf->area = NULL; 249 } 250 251 static int tegra_pcm_dma_allocate(struct device *dev, struct snd_soc_pcm_runtime *rtd, 252 size_t size) 253 { 254 struct snd_pcm *pcm = rtd->pcm; 255 int ret; 256 257 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); 258 if (ret < 0) 259 return ret; 260 261 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 262 ret = tegra_pcm_preallocate_dma_buffer(dev, pcm, SNDRV_PCM_STREAM_PLAYBACK, size); 263 if (ret) 264 goto err; 265 } 266 267 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 268 ret = tegra_pcm_preallocate_dma_buffer(dev, pcm, SNDRV_PCM_STREAM_CAPTURE, size); 269 if (ret) 270 goto err_free_play; 271 } 272 273 return 0; 274 275 err_free_play: 276 tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK); 277 err: 278 return ret; 279 } 280 281 int tegra_pcm_construct(struct snd_soc_component *component, 282 struct snd_soc_pcm_runtime *rtd) 283 { 284 struct device *dev = component->dev; 285 286 /* 287 * Fallback for backwards-compatibility with older device trees that 288 * have the iommus property in the virtual, top-level "sound" node. 289 */ 290 if (!of_get_property(dev->of_node, "iommus", NULL)) 291 dev = rtd->card->snd_card->dev; 292 293 return tegra_pcm_dma_allocate(dev, rtd, tegra_pcm_hardware.buffer_bytes_max); 294 } 295 EXPORT_SYMBOL_GPL(tegra_pcm_construct); 296 297 void tegra_pcm_destruct(struct snd_soc_component *component, 298 struct snd_pcm *pcm) 299 { 300 tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE); 301 tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK); 302 } 303 EXPORT_SYMBOL_GPL(tegra_pcm_destruct); 304 305 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); 306 MODULE_DESCRIPTION("Tegra PCM ASoC driver"); 307 MODULE_LICENSE("GPL"); 308