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 devm_tegra_pcm_platform_register(struct device *dev) 52 { 53 return devm_snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0); 54 } 55 EXPORT_SYMBOL_GPL(devm_tegra_pcm_platform_register); 56 57 int tegra_pcm_platform_register_with_chan_names(struct device *dev, 58 struct snd_dmaengine_pcm_config *config, 59 char *txdmachan, char *rxdmachan) 60 { 61 *config = tegra_dmaengine_pcm_config; 62 config->dma_dev = dev->parent; 63 config->chan_names[0] = txdmachan; 64 config->chan_names[1] = rxdmachan; 65 66 return snd_dmaengine_pcm_register(dev, config, 0); 67 } 68 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names); 69 70 void tegra_pcm_platform_unregister(struct device *dev) 71 { 72 return snd_dmaengine_pcm_unregister(dev); 73 } 74 EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister); 75 76 int tegra_pcm_open(struct snd_soc_component *component, 77 struct snd_pcm_substream *substream) 78 { 79 struct snd_soc_pcm_runtime *rtd = substream->private_data; 80 struct snd_dmaengine_dai_dma_data *dmap; 81 struct dma_chan *chan; 82 struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0); 83 int ret; 84 85 if (rtd->dai_link->no_pcm) 86 return 0; 87 88 dmap = snd_soc_dai_get_dma_data(cpu_dai, substream); 89 90 /* Set HW params now that initialization is complete */ 91 snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware); 92 93 /* Ensure period size is multiple of 8 */ 94 ret = snd_pcm_hw_constraint_step(substream->runtime, 0, 95 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 0x8); 96 if (ret) { 97 dev_err(rtd->dev, "failed to set constraint %d\n", ret); 98 return ret; 99 } 100 101 chan = dma_request_chan(cpu_dai->dev, dmap->chan_name); 102 if (IS_ERR(chan)) { 103 dev_err(cpu_dai->dev, 104 "dmaengine request slave channel failed! (%s)\n", 105 dmap->chan_name); 106 return -ENODEV; 107 } 108 109 ret = snd_dmaengine_pcm_open(substream, chan); 110 if (ret) { 111 dev_err(rtd->dev, 112 "dmaengine pcm open failed with err %d (%s)\n", ret, 113 dmap->chan_name); 114 115 dma_release_channel(chan); 116 117 return ret; 118 } 119 120 /* Set wait time to 500ms by default */ 121 substream->wait_time = 500; 122 123 return 0; 124 } 125 EXPORT_SYMBOL_GPL(tegra_pcm_open); 126 127 int tegra_pcm_close(struct snd_soc_component *component, 128 struct snd_pcm_substream *substream) 129 { 130 struct snd_soc_pcm_runtime *rtd = substream->private_data; 131 132 if (rtd->dai_link->no_pcm) 133 return 0; 134 135 snd_dmaengine_pcm_close_release_chan(substream); 136 137 return 0; 138 } 139 EXPORT_SYMBOL_GPL(tegra_pcm_close); 140 141 int tegra_pcm_hw_params(struct snd_soc_component *component, 142 struct snd_pcm_substream *substream, 143 struct snd_pcm_hw_params *params) 144 { 145 struct snd_soc_pcm_runtime *rtd = substream->private_data; 146 struct snd_dmaengine_dai_dma_data *dmap; 147 struct dma_slave_config slave_config; 148 struct dma_chan *chan; 149 int ret; 150 151 if (rtd->dai_link->no_pcm) 152 return 0; 153 154 dmap = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream); 155 if (!dmap) 156 return 0; 157 158 chan = snd_dmaengine_pcm_get_chan(substream); 159 160 ret = snd_hwparams_to_dma_slave_config(substream, params, 161 &slave_config); 162 if (ret) { 163 dev_err(rtd->dev, "hw params config failed with err %d\n", ret); 164 return ret; 165 } 166 167 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 168 slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 169 slave_config.dst_addr = dmap->addr; 170 slave_config.dst_maxburst = 8; 171 } else { 172 slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 173 slave_config.src_addr = dmap->addr; 174 slave_config.src_maxburst = 8; 175 } 176 177 ret = dmaengine_slave_config(chan, &slave_config); 178 if (ret < 0) { 179 dev_err(rtd->dev, "dma slave config failed with err %d\n", ret); 180 return ret; 181 } 182 183 return 0; 184 } 185 EXPORT_SYMBOL_GPL(tegra_pcm_hw_params); 186 187 snd_pcm_uframes_t tegra_pcm_pointer(struct snd_soc_component *component, 188 struct snd_pcm_substream *substream) 189 { 190 return snd_dmaengine_pcm_pointer(substream); 191 } 192 EXPORT_SYMBOL_GPL(tegra_pcm_pointer); 193 194 static int tegra_pcm_dma_allocate(struct device *dev, struct snd_soc_pcm_runtime *rtd, 195 size_t size) 196 { 197 struct snd_pcm *pcm = rtd->pcm; 198 int ret; 199 200 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); 201 if (ret < 0) 202 return ret; 203 204 return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC, dev, size); 205 } 206 207 int tegra_pcm_construct(struct snd_soc_component *component, 208 struct snd_soc_pcm_runtime *rtd) 209 { 210 struct device *dev = component->dev; 211 212 /* 213 * Fallback for backwards-compatibility with older device trees that 214 * have the iommus property in the virtual, top-level "sound" node. 215 */ 216 if (!of_get_property(dev->of_node, "iommus", NULL)) 217 dev = rtd->card->snd_card->dev; 218 219 return tegra_pcm_dma_allocate(dev, rtd, tegra_pcm_hardware.buffer_bytes_max); 220 } 221 EXPORT_SYMBOL_GPL(tegra_pcm_construct); 222 223 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); 224 MODULE_DESCRIPTION("Tegra PCM ASoC driver"); 225 MODULE_LICENSE("GPL"); 226