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 return 0; 175 } 176 EXPORT_SYMBOL_GPL(tegra_pcm_hw_params); 177 178 snd_pcm_uframes_t tegra_pcm_pointer(struct snd_soc_component *component, 179 struct snd_pcm_substream *substream) 180 { 181 return snd_dmaengine_pcm_pointer(substream); 182 } 183 EXPORT_SYMBOL_GPL(tegra_pcm_pointer); 184 185 static int tegra_pcm_dma_allocate(struct device *dev, struct snd_soc_pcm_runtime *rtd, 186 size_t size) 187 { 188 struct snd_pcm *pcm = rtd->pcm; 189 int ret; 190 191 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); 192 if (ret < 0) 193 return ret; 194 195 return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC, dev, size); 196 } 197 198 int tegra_pcm_construct(struct snd_soc_component *component, 199 struct snd_soc_pcm_runtime *rtd) 200 { 201 struct device *dev = component->dev; 202 203 /* 204 * Fallback for backwards-compatibility with older device trees that 205 * have the iommus property in the virtual, top-level "sound" node. 206 */ 207 if (!of_get_property(dev->of_node, "iommus", NULL)) 208 dev = rtd->card->snd_card->dev; 209 210 return tegra_pcm_dma_allocate(dev, rtd, tegra_pcm_hardware.buffer_bytes_max); 211 } 212 EXPORT_SYMBOL_GPL(tegra_pcm_construct); 213 214 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); 215 MODULE_DESCRIPTION("Tegra PCM ASoC driver"); 216 MODULE_LICENSE("GPL"); 217