1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Socionext UniPhier AIO DMA driver. 4 // 5 // Copyright (c) 2016-2018 Socionext Inc. 6 7 #include <linux/dma-mapping.h> 8 #include <linux/errno.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <sound/core.h> 12 #include <sound/pcm.h> 13 #include <sound/soc.h> 14 15 #include "aio.h" 16 17 static struct snd_pcm_hardware uniphier_aiodma_hw = { 18 .info = SNDRV_PCM_INFO_MMAP | 19 SNDRV_PCM_INFO_MMAP_VALID | 20 SNDRV_PCM_INFO_INTERLEAVED, 21 .period_bytes_min = 256, 22 .period_bytes_max = 4096, 23 .periods_min = 4, 24 .periods_max = 1024, 25 .buffer_bytes_max = 128 * 1024, 26 }; 27 28 static void aiodma_pcm_irq(struct uniphier_aio_sub *sub) 29 { 30 struct snd_pcm_runtime *runtime = sub->substream->runtime; 31 int bytes = runtime->period_size * 32 runtime->channels * samples_to_bytes(runtime, 1); 33 int ret; 34 35 spin_lock(&sub->lock); 36 ret = aiodma_rb_set_threshold(sub, runtime->dma_bytes, 37 sub->threshold + bytes); 38 if (!ret) 39 sub->threshold += bytes; 40 41 aiodma_rb_sync(sub, runtime->dma_addr, runtime->dma_bytes, bytes); 42 aiodma_rb_clear_irq(sub); 43 spin_unlock(&sub->lock); 44 45 snd_pcm_period_elapsed(sub->substream); 46 } 47 48 static void aiodma_compr_irq(struct uniphier_aio_sub *sub) 49 { 50 struct snd_compr_runtime *runtime = sub->cstream->runtime; 51 int bytes = runtime->fragment_size; 52 int ret; 53 54 spin_lock(&sub->lock); 55 ret = aiodma_rb_set_threshold(sub, sub->compr_bytes, 56 sub->threshold + bytes); 57 if (!ret) 58 sub->threshold += bytes; 59 60 aiodma_rb_sync(sub, sub->compr_addr, sub->compr_bytes, bytes); 61 aiodma_rb_clear_irq(sub); 62 spin_unlock(&sub->lock); 63 64 snd_compr_fragment_elapsed(sub->cstream); 65 } 66 67 static irqreturn_t aiodma_irq(int irq, void *p) 68 { 69 struct platform_device *pdev = p; 70 struct uniphier_aio_chip *chip = platform_get_drvdata(pdev); 71 irqreturn_t ret = IRQ_NONE; 72 int i, j; 73 74 for (i = 0; i < chip->num_aios; i++) { 75 struct uniphier_aio *aio = &chip->aios[i]; 76 77 for (j = 0; j < ARRAY_SIZE(aio->sub); j++) { 78 struct uniphier_aio_sub *sub = &aio->sub[j]; 79 80 /* Skip channel that does not trigger */ 81 if (!sub->running || !aiodma_rb_is_irq(sub)) 82 continue; 83 84 if (sub->substream) 85 aiodma_pcm_irq(sub); 86 if (sub->cstream) 87 aiodma_compr_irq(sub); 88 89 ret = IRQ_HANDLED; 90 } 91 } 92 93 return ret; 94 } 95 96 static int uniphier_aiodma_open(struct snd_soc_component *component, 97 struct snd_pcm_substream *substream) 98 { 99 struct snd_pcm_runtime *runtime = substream->runtime; 100 101 snd_soc_set_runtime_hwparams(substream, &uniphier_aiodma_hw); 102 103 return snd_pcm_hw_constraint_step(runtime, 0, 104 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256); 105 } 106 107 static int uniphier_aiodma_prepare(struct snd_soc_component *component, 108 struct snd_pcm_substream *substream) 109 { 110 struct snd_pcm_runtime *runtime = substream->runtime; 111 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); 112 struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai); 113 struct uniphier_aio_sub *sub = &aio->sub[substream->stream]; 114 int bytes = runtime->period_size * 115 runtime->channels * samples_to_bytes(runtime, 1); 116 unsigned long flags; 117 int ret; 118 119 ret = aiodma_ch_set_param(sub); 120 if (ret) 121 return ret; 122 123 spin_lock_irqsave(&sub->lock, flags); 124 ret = aiodma_rb_set_buffer(sub, runtime->dma_addr, 125 runtime->dma_addr + runtime->dma_bytes, 126 bytes); 127 spin_unlock_irqrestore(&sub->lock, flags); 128 if (ret) 129 return ret; 130 131 return 0; 132 } 133 134 static int uniphier_aiodma_trigger(struct snd_soc_component *component, 135 struct snd_pcm_substream *substream, int cmd) 136 { 137 struct snd_pcm_runtime *runtime = substream->runtime; 138 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); 139 struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai); 140 struct uniphier_aio_sub *sub = &aio->sub[substream->stream]; 141 struct device *dev = &aio->chip->pdev->dev; 142 int bytes = runtime->period_size * 143 runtime->channels * samples_to_bytes(runtime, 1); 144 unsigned long flags; 145 146 spin_lock_irqsave(&sub->lock, flags); 147 switch (cmd) { 148 case SNDRV_PCM_TRIGGER_START: 149 aiodma_rb_sync(sub, runtime->dma_addr, runtime->dma_bytes, 150 bytes); 151 aiodma_ch_set_enable(sub, 1); 152 sub->running = 1; 153 154 break; 155 case SNDRV_PCM_TRIGGER_STOP: 156 sub->running = 0; 157 aiodma_ch_set_enable(sub, 0); 158 159 break; 160 default: 161 dev_warn(dev, "Unknown trigger(%d) ignored\n", cmd); 162 break; 163 } 164 spin_unlock_irqrestore(&sub->lock, flags); 165 166 return 0; 167 } 168 169 static snd_pcm_uframes_t uniphier_aiodma_pointer( 170 struct snd_soc_component *component, 171 struct snd_pcm_substream *substream) 172 { 173 struct snd_pcm_runtime *runtime = substream->runtime; 174 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); 175 struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai); 176 struct uniphier_aio_sub *sub = &aio->sub[substream->stream]; 177 int bytes = runtime->period_size * 178 runtime->channels * samples_to_bytes(runtime, 1); 179 unsigned long flags; 180 snd_pcm_uframes_t pos; 181 182 spin_lock_irqsave(&sub->lock, flags); 183 aiodma_rb_sync(sub, runtime->dma_addr, runtime->dma_bytes, bytes); 184 185 if (sub->swm->dir == PORT_DIR_OUTPUT) 186 pos = bytes_to_frames(runtime, sub->rd_offs); 187 else 188 pos = bytes_to_frames(runtime, sub->wr_offs); 189 spin_unlock_irqrestore(&sub->lock, flags); 190 191 return pos; 192 } 193 194 static int uniphier_aiodma_mmap(struct snd_soc_component *component, 195 struct snd_pcm_substream *substream, 196 struct vm_area_struct *vma) 197 { 198 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); 199 200 return remap_pfn_range(vma, vma->vm_start, 201 substream->dma_buffer.addr >> PAGE_SHIFT, 202 vma->vm_end - vma->vm_start, vma->vm_page_prot); 203 } 204 205 static int uniphier_aiodma_new(struct snd_soc_component *component, 206 struct snd_soc_pcm_runtime *rtd) 207 { 208 struct device *dev = rtd->card->snd_card->dev; 209 struct snd_pcm *pcm = rtd->pcm; 210 int ret; 211 212 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(33)); 213 if (ret) 214 return ret; 215 216 snd_pcm_set_managed_buffer_all(pcm, 217 SNDRV_DMA_TYPE_DEV, dev, 218 uniphier_aiodma_hw.buffer_bytes_max, 219 uniphier_aiodma_hw.buffer_bytes_max); 220 return 0; 221 } 222 223 static const struct snd_soc_component_driver uniphier_soc_platform = { 224 .open = uniphier_aiodma_open, 225 .prepare = uniphier_aiodma_prepare, 226 .trigger = uniphier_aiodma_trigger, 227 .pointer = uniphier_aiodma_pointer, 228 .mmap = uniphier_aiodma_mmap, 229 .pcm_construct = uniphier_aiodma_new, 230 .compr_ops = &uniphier_aio_compr_ops, 231 }; 232 233 static const struct regmap_config aiodma_regmap_config = { 234 .reg_bits = 32, 235 .reg_stride = 4, 236 .val_bits = 32, 237 .max_register = 0x7fffc, 238 .cache_type = REGCACHE_NONE, 239 }; 240 241 /** 242 * uniphier_aiodma_soc_register_platform - register the AIO DMA 243 * @pdev: the platform device 244 * 245 * Register and setup the DMA of AIO to transfer the sound data to device. 246 * This function need to call once at driver startup and need NOT to call 247 * unregister function. 248 * 249 * Return: Zero if successful, otherwise a negative value on error. 250 */ 251 int uniphier_aiodma_soc_register_platform(struct platform_device *pdev) 252 { 253 struct uniphier_aio_chip *chip = platform_get_drvdata(pdev); 254 struct device *dev = &pdev->dev; 255 void __iomem *preg; 256 int irq, ret; 257 258 preg = devm_platform_ioremap_resource(pdev, 0); 259 if (IS_ERR(preg)) 260 return PTR_ERR(preg); 261 262 chip->regmap = devm_regmap_init_mmio(dev, preg, 263 &aiodma_regmap_config); 264 if (IS_ERR(chip->regmap)) 265 return PTR_ERR(chip->regmap); 266 267 irq = platform_get_irq(pdev, 0); 268 if (irq < 0) 269 return irq; 270 271 ret = devm_request_irq(dev, irq, aiodma_irq, 272 IRQF_SHARED, dev_name(dev), pdev); 273 if (ret) 274 return ret; 275 276 return devm_snd_soc_register_component(dev, &uniphier_soc_platform, 277 NULL, 0); 278 } 279 EXPORT_SYMBOL_GPL(uniphier_aiodma_soc_register_platform); 280