1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) 2 // 3 // This file is provided under a dual BSD/GPLv2 license. When using or 4 // redistributing this file, you may do so under either license. 5 // 6 // Copyright(c) 2021 Advanced Micro Devices, Inc. 7 // 8 // Authors: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com> 9 10 /* 11 * Generic interface for ACP audio blck PCM component 12 */ 13 14 #include <linux/platform_device.h> 15 #include <linux/module.h> 16 #include <linux/err.h> 17 #include <linux/io.h> 18 #include <sound/pcm_params.h> 19 #include <sound/soc.h> 20 #include <sound/soc-dai.h> 21 #include <linux/pm_runtime.h> 22 #include <linux/dma-mapping.h> 23 24 #include "amd.h" 25 26 #define DRV_NAME "acp_i2s_dma" 27 28 static const struct snd_pcm_hardware acp_pcm_hardware_playback = { 29 .info = SNDRV_PCM_INFO_INTERLEAVED | 30 SNDRV_PCM_INFO_BLOCK_TRANSFER | 31 SNDRV_PCM_INFO_BATCH | 32 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | 33 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, 34 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 | 35 SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S24_LE | 36 SNDRV_PCM_FMTBIT_S32_LE, 37 .channels_min = 2, 38 .channels_max = 8, 39 .rates = SNDRV_PCM_RATE_8000_96000, 40 .rate_min = 8000, 41 .rate_max = 96000, 42 .buffer_bytes_max = PLAYBACK_MAX_NUM_PERIODS * PLAYBACK_MAX_PERIOD_SIZE, 43 .period_bytes_min = PLAYBACK_MIN_PERIOD_SIZE, 44 .period_bytes_max = PLAYBACK_MAX_PERIOD_SIZE, 45 .periods_min = PLAYBACK_MIN_NUM_PERIODS, 46 .periods_max = PLAYBACK_MAX_NUM_PERIODS, 47 }; 48 49 static const struct snd_pcm_hardware acp_pcm_hardware_capture = { 50 .info = SNDRV_PCM_INFO_INTERLEAVED | 51 SNDRV_PCM_INFO_BLOCK_TRANSFER | 52 SNDRV_PCM_INFO_BATCH | 53 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | 54 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, 55 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 | 56 SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S24_LE | 57 SNDRV_PCM_FMTBIT_S32_LE, 58 .channels_min = 2, 59 .channels_max = 2, 60 .rates = SNDRV_PCM_RATE_8000_48000, 61 .rate_min = 8000, 62 .rate_max = 48000, 63 .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE, 64 .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE, 65 .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE, 66 .periods_min = CAPTURE_MIN_NUM_PERIODS, 67 .periods_max = CAPTURE_MAX_NUM_PERIODS, 68 }; 69 70 int acp_machine_select(struct acp_dev_data *adata) 71 { 72 struct snd_soc_acpi_mach *mach; 73 int size; 74 75 size = sizeof(*adata->machines); 76 mach = snd_soc_acpi_find_machine(adata->machines); 77 if (!mach) { 78 dev_err(adata->dev, "warning: No matching ASoC machine driver found\n"); 79 return -EINVAL; 80 } 81 82 adata->mach_dev = platform_device_register_data(adata->dev, mach->drv_name, 83 PLATFORM_DEVID_NONE, mach, size); 84 if (IS_ERR(adata->mach_dev)) 85 dev_warn(adata->dev, "Unable to register Machine device\n"); 86 87 return 0; 88 } 89 EXPORT_SYMBOL_NS_GPL(acp_machine_select, SND_SOC_ACP_COMMON); 90 91 static irqreturn_t i2s_irq_handler(int irq, void *data) 92 { 93 struct acp_dev_data *adata = data; 94 struct acp_stream *stream; 95 u16 i2s_flag = 0; 96 u32 val, i; 97 98 if (!adata) 99 return IRQ_NONE; 100 101 val = readl(adata->acp_base + ACP_EXTERNAL_INTR_STAT); 102 103 for (i = 0; i < ACP_MAX_STREAM; i++) { 104 stream = adata->stream[i]; 105 if (stream && (val & stream->irq_bit)) { 106 writel(stream->irq_bit, adata->acp_base + ACP_EXTERNAL_INTR_STAT); 107 snd_pcm_period_elapsed(stream->substream); 108 i2s_flag = 1; 109 break; 110 } 111 } 112 113 if (i2s_flag) 114 return IRQ_HANDLED; 115 116 return IRQ_NONE; 117 } 118 119 static void config_pte_for_stream(struct acp_dev_data *adata, struct acp_stream *stream) 120 { 121 u32 pte_reg, pte_size, reg_val; 122 123 /* Use ATU base Group5 */ 124 pte_reg = ACPAXI2AXI_ATU_BASE_ADDR_GRP_5; 125 pte_size = ACPAXI2AXI_ATU_PAGE_SIZE_GRP_5; 126 stream->reg_offset = 0x02000000; 127 128 /* Group Enable */ 129 reg_val = ACP_SRAM_PTE_OFFSET; 130 writel(reg_val | BIT(31), adata->acp_base + pte_reg); 131 writel(PAGE_SIZE_4K_ENABLE, adata->acp_base + pte_size); 132 } 133 134 static void config_acp_dma(struct acp_dev_data *adata, int cpu_id, int size) 135 { 136 struct acp_stream *stream = adata->stream[cpu_id]; 137 struct snd_pcm_substream *substream = stream->substream; 138 dma_addr_t addr = substream->dma_buffer.addr; 139 int num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT); 140 u32 low, high, val; 141 u16 page_idx; 142 143 val = stream->pte_offset; 144 145 for (page_idx = 0; page_idx < num_pages; page_idx++) { 146 /* Load the low address of page int ACP SRAM through SRBM */ 147 low = lower_32_bits(addr); 148 high = upper_32_bits(addr); 149 writel(low, adata->acp_base + ACP_SCRATCH_REG_0 + val); 150 high |= BIT(31); 151 writel(high, adata->acp_base + ACP_SCRATCH_REG_0 + val + 4); 152 153 /* Move to next physically contiguous page */ 154 val += 8; 155 addr += PAGE_SIZE; 156 } 157 } 158 159 static int acp_dma_open(struct snd_soc_component *component, struct snd_pcm_substream *substream) 160 { 161 struct snd_soc_pcm_runtime *soc_runtime = asoc_substream_to_rtd(substream); 162 struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(soc_runtime, 0); 163 struct snd_pcm_runtime *runtime = substream->runtime; 164 struct device *dev = component->dev; 165 struct acp_dev_data *adata = dev_get_drvdata(dev); 166 struct acp_stream *stream; 167 int stream_id = cpu_dai->driver->id * 2 + substream->stream; 168 int ret; 169 170 stream = kzalloc(sizeof(*stream), GFP_KERNEL); 171 if (!stream) 172 return -ENOMEM; 173 174 stream->substream = substream; 175 adata->stream[stream_id] = stream; 176 177 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 178 runtime->hw = acp_pcm_hardware_playback; 179 else 180 runtime->hw = acp_pcm_hardware_capture; 181 182 ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 183 if (ret < 0) { 184 dev_err(component->dev, "set integer constraint failed\n"); 185 kfree(stream); 186 return ret; 187 } 188 runtime->private_data = stream; 189 190 writel(1, adata->acp_base + ACP_EXTERNAL_INTR_ENB); 191 192 return ret; 193 } 194 195 static int acp_dma_hw_params(struct snd_soc_component *component, 196 struct snd_pcm_substream *substream, 197 struct snd_pcm_hw_params *params) 198 { 199 struct snd_soc_pcm_runtime *soc_runtime = asoc_substream_to_rtd(substream); 200 struct acp_dev_data *adata = snd_soc_component_get_drvdata(component); 201 struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(soc_runtime, 0); 202 struct acp_stream *stream = substream->runtime->private_data; 203 int stream_id = cpu_dai->driver->id * 2 + substream->stream; 204 u64 size = params_buffer_bytes(params); 205 206 /* Configure ACP DMA block with params */ 207 config_pte_for_stream(adata, stream); 208 config_acp_dma(adata, stream_id, size); 209 210 return 0; 211 } 212 213 static snd_pcm_uframes_t acp_dma_pointer(struct snd_soc_component *component, 214 struct snd_pcm_substream *substream) 215 { 216 struct device *dev = component->dev; 217 struct acp_dev_data *adata = dev_get_drvdata(dev); 218 struct acp_stream *stream = substream->runtime->private_data; 219 u32 pos, buffersize; 220 u64 bytescount; 221 222 buffersize = frames_to_bytes(substream->runtime, 223 substream->runtime->buffer_size); 224 225 bytescount = acp_get_byte_count(adata, stream->dai_id, substream->stream); 226 227 if (bytescount > stream->bytescount) 228 bytescount -= stream->bytescount; 229 230 pos = do_div(bytescount, buffersize); 231 232 return bytes_to_frames(substream->runtime, pos); 233 } 234 235 static int acp_dma_new(struct snd_soc_component *component, 236 struct snd_soc_pcm_runtime *rtd) 237 { 238 struct device *parent = component->dev->parent; 239 240 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV, 241 parent, MIN_BUFFER, MAX_BUFFER); 242 return 0; 243 } 244 245 static int acp_dma_mmap(struct snd_soc_component *component, 246 struct snd_pcm_substream *substream, 247 struct vm_area_struct *vma) 248 { 249 return snd_pcm_lib_default_mmap(substream, vma); 250 } 251 252 static int acp_dma_close(struct snd_soc_component *component, 253 struct snd_pcm_substream *substream) 254 { 255 struct snd_soc_pcm_runtime *soc_runtime = asoc_substream_to_rtd(substream); 256 struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(soc_runtime, 0); 257 struct device *dev = component->dev; 258 struct acp_dev_data *adata = dev_get_drvdata(dev); 259 struct acp_stream *stream; 260 int stream_id = cpu_dai->driver->id * 2 + substream->stream; 261 262 stream = adata->stream[stream_id]; 263 kfree(stream); 264 adata->stream[stream_id] = NULL; 265 266 return 0; 267 } 268 269 static const struct snd_soc_component_driver acp_pcm_component = { 270 .name = DRV_NAME, 271 .open = acp_dma_open, 272 .close = acp_dma_close, 273 .hw_params = acp_dma_hw_params, 274 .pointer = acp_dma_pointer, 275 .mmap = acp_dma_mmap, 276 .pcm_construct = acp_dma_new, 277 }; 278 279 int acp_platform_register(struct device *dev) 280 { 281 struct acp_dev_data *adata = dev_get_drvdata(dev); 282 struct snd_soc_dai_driver; 283 unsigned int status; 284 285 status = devm_request_irq(dev, adata->i2s_irq, i2s_irq_handler, 286 IRQF_SHARED, "ACP_I2S_IRQ", adata); 287 if (status) { 288 dev_err(dev, "ACP I2S IRQ request failed\n"); 289 return status; 290 } 291 292 status = devm_snd_soc_register_component(dev, &acp_pcm_component, 293 adata->dai_driver, 294 adata->num_dai); 295 if (status) { 296 dev_err(dev, "Fail to register acp i2s component\n"); 297 return status; 298 } 299 return 0; 300 } 301 EXPORT_SYMBOL_NS_GPL(acp_platform_register, SND_SOC_ACP_COMMON); 302 303 int acp_platform_unregister(struct device *dev) 304 { 305 struct acp_dev_data *adata = dev_get_drvdata(dev); 306 307 if (adata->mach_dev) 308 platform_device_unregister(adata->mach_dev); 309 return 0; 310 } 311 EXPORT_SYMBOL_NS_GPL(acp_platform_unregister, SND_SOC_ACP_COMMON); 312 313 MODULE_DESCRIPTION("AMD ACP PCM Driver"); 314 MODULE_LICENSE("Dual BSD/GPL"); 315 MODULE_ALIAS(DRV_NAME); 316