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/dma-mapping.h> 22 23 #include "amd.h" 24 25 #define DRV_NAME "acp_i2s_dma" 26 27 static const struct snd_pcm_hardware acp_pcm_hardware_playback = { 28 .info = SNDRV_PCM_INFO_INTERLEAVED | 29 SNDRV_PCM_INFO_BLOCK_TRANSFER | 30 SNDRV_PCM_INFO_BATCH | 31 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | 32 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, 33 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 | 34 SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S24_LE | 35 SNDRV_PCM_FMTBIT_S32_LE, 36 .channels_min = 2, 37 .channels_max = 8, 38 .rates = SNDRV_PCM_RATE_8000_96000, 39 .rate_min = 8000, 40 .rate_max = 96000, 41 .buffer_bytes_max = PLAYBACK_MAX_NUM_PERIODS * PLAYBACK_MAX_PERIOD_SIZE, 42 .period_bytes_min = PLAYBACK_MIN_PERIOD_SIZE, 43 .period_bytes_max = PLAYBACK_MAX_PERIOD_SIZE, 44 .periods_min = PLAYBACK_MIN_NUM_PERIODS, 45 .periods_max = PLAYBACK_MAX_NUM_PERIODS, 46 }; 47 48 static const struct snd_pcm_hardware acp_pcm_hardware_capture = { 49 .info = SNDRV_PCM_INFO_INTERLEAVED | 50 SNDRV_PCM_INFO_BLOCK_TRANSFER | 51 SNDRV_PCM_INFO_BATCH | 52 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | 53 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, 54 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 | 55 SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S24_LE | 56 SNDRV_PCM_FMTBIT_S32_LE, 57 .channels_min = 2, 58 .channels_max = 2, 59 .rates = SNDRV_PCM_RATE_8000_48000, 60 .rate_min = 8000, 61 .rate_max = 48000, 62 .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE, 63 .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE, 64 .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE, 65 .periods_min = CAPTURE_MIN_NUM_PERIODS, 66 .periods_max = CAPTURE_MAX_NUM_PERIODS, 67 }; 68 69 int acp_machine_select(struct acp_dev_data *adata) 70 { 71 struct snd_soc_acpi_mach *mach; 72 int size; 73 74 size = sizeof(*adata->machines); 75 mach = snd_soc_acpi_find_machine(adata->machines); 76 if (!mach) { 77 dev_err(adata->dev, "warning: No matching ASoC machine driver found\n"); 78 return -EINVAL; 79 } 80 81 adata->mach_dev = platform_device_register_data(adata->dev, mach->drv_name, 82 PLATFORM_DEVID_NONE, mach, size); 83 if (IS_ERR(adata->mach_dev)) 84 dev_warn(adata->dev, "Unable to register Machine device\n"); 85 86 return 0; 87 } 88 EXPORT_SYMBOL_NS_GPL(acp_machine_select, SND_SOC_ACP_COMMON); 89 90 static irqreturn_t i2s_irq_handler(int irq, void *data) 91 { 92 struct acp_dev_data *adata = data; 93 struct acp_resource *rsrc = adata->rsrc; 94 struct acp_stream *stream; 95 u16 i2s_flag = 0; 96 u32 ext_intr_stat, ext_intr_stat1; 97 98 if (!adata) 99 return IRQ_NONE; 100 101 if (adata->rsrc->no_of_ctrls == 2) 102 ext_intr_stat1 = readl(ACP_EXTERNAL_INTR_STAT(adata, (rsrc->irqp_used - 1))); 103 104 ext_intr_stat = readl(ACP_EXTERNAL_INTR_STAT(adata, rsrc->irqp_used)); 105 106 spin_lock(&adata->acp_lock); 107 list_for_each_entry(stream, &adata->stream_list, list) { 108 if (ext_intr_stat & stream->irq_bit) { 109 writel(stream->irq_bit, 110 ACP_EXTERNAL_INTR_STAT(adata, rsrc->irqp_used)); 111 snd_pcm_period_elapsed(stream->substream); 112 i2s_flag = 1; 113 } 114 if (adata->rsrc->no_of_ctrls == 2) { 115 if (ext_intr_stat1 & stream->irq_bit) { 116 writel(stream->irq_bit, ACP_EXTERNAL_INTR_STAT(adata, 117 (rsrc->irqp_used - 1))); 118 snd_pcm_period_elapsed(stream->substream); 119 i2s_flag = 1; 120 } 121 } 122 } 123 spin_unlock(&adata->acp_lock); 124 if (i2s_flag) 125 return IRQ_HANDLED; 126 127 return IRQ_NONE; 128 } 129 130 static void config_pte_for_stream(struct acp_dev_data *adata, struct acp_stream *stream) 131 { 132 struct acp_resource *rsrc = adata->rsrc; 133 u32 pte_reg, pte_size, reg_val; 134 135 /* Use ATU base Group5 */ 136 pte_reg = ACPAXI2AXI_ATU_BASE_ADDR_GRP_5; 137 pte_size = ACPAXI2AXI_ATU_PAGE_SIZE_GRP_5; 138 stream->reg_offset = 0x02000000; 139 140 /* Group Enable */ 141 reg_val = rsrc->sram_pte_offset; 142 writel(reg_val | BIT(31), adata->acp_base + pte_reg); 143 writel(PAGE_SIZE_4K_ENABLE, adata->acp_base + pte_size); 144 writel(0x01, adata->acp_base + ACPAXI2AXI_ATU_CTRL); 145 } 146 147 static void config_acp_dma(struct acp_dev_data *adata, struct acp_stream *stream, int size) 148 { 149 struct snd_pcm_substream *substream = stream->substream; 150 struct acp_resource *rsrc = adata->rsrc; 151 dma_addr_t addr = substream->dma_buffer.addr; 152 int num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT); 153 u32 low, high, val; 154 u16 page_idx; 155 156 val = stream->pte_offset; 157 158 for (page_idx = 0; page_idx < num_pages; page_idx++) { 159 /* Load the low address of page int ACP SRAM through SRBM */ 160 low = lower_32_bits(addr); 161 high = upper_32_bits(addr); 162 writel(low, adata->acp_base + rsrc->scratch_reg_offset + val); 163 high |= BIT(31); 164 writel(high, adata->acp_base + rsrc->scratch_reg_offset + val + 4); 165 166 /* Move to next physically contiguous page */ 167 val += 8; 168 addr += PAGE_SIZE; 169 } 170 } 171 172 static int acp_dma_open(struct snd_soc_component *component, struct snd_pcm_substream *substream) 173 { 174 struct snd_pcm_runtime *runtime = substream->runtime; 175 struct device *dev = component->dev; 176 struct acp_dev_data *adata = dev_get_drvdata(dev); 177 struct acp_stream *stream; 178 int ret; 179 180 stream = kzalloc(sizeof(*stream), GFP_KERNEL); 181 if (!stream) 182 return -ENOMEM; 183 184 stream->substream = substream; 185 186 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 187 runtime->hw = acp_pcm_hardware_playback; 188 else 189 runtime->hw = acp_pcm_hardware_capture; 190 191 ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 192 if (ret < 0) { 193 dev_err(component->dev, "set integer constraint failed\n"); 194 kfree(stream); 195 return ret; 196 } 197 runtime->private_data = stream; 198 199 writel(1, ACP_EXTERNAL_INTR_ENB(adata)); 200 201 spin_lock_irq(&adata->acp_lock); 202 list_add_tail(&stream->list, &adata->stream_list); 203 spin_unlock_irq(&adata->acp_lock); 204 205 return ret; 206 } 207 208 static int acp_dma_hw_params(struct snd_soc_component *component, 209 struct snd_pcm_substream *substream, 210 struct snd_pcm_hw_params *params) 211 { 212 struct acp_dev_data *adata = snd_soc_component_get_drvdata(component); 213 struct acp_stream *stream = substream->runtime->private_data; 214 u64 size = params_buffer_bytes(params); 215 216 /* Configure ACP DMA block with params */ 217 config_pte_for_stream(adata, stream); 218 config_acp_dma(adata, stream, size); 219 220 return 0; 221 } 222 223 static snd_pcm_uframes_t acp_dma_pointer(struct snd_soc_component *component, 224 struct snd_pcm_substream *substream) 225 { 226 struct device *dev = component->dev; 227 struct acp_dev_data *adata = dev_get_drvdata(dev); 228 struct acp_stream *stream = substream->runtime->private_data; 229 u32 pos, buffersize; 230 u64 bytescount; 231 232 buffersize = frames_to_bytes(substream->runtime, 233 substream->runtime->buffer_size); 234 235 bytescount = acp_get_byte_count(adata, stream->dai_id, substream->stream); 236 237 if (bytescount > stream->bytescount) 238 bytescount -= stream->bytescount; 239 240 pos = do_div(bytescount, buffersize); 241 242 return bytes_to_frames(substream->runtime, pos); 243 } 244 245 static int acp_dma_new(struct snd_soc_component *component, 246 struct snd_soc_pcm_runtime *rtd) 247 { 248 struct device *parent = component->dev->parent; 249 250 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV, 251 parent, MIN_BUFFER, MAX_BUFFER); 252 return 0; 253 } 254 255 static int acp_dma_close(struct snd_soc_component *component, 256 struct snd_pcm_substream *substream) 257 { 258 struct device *dev = component->dev; 259 struct acp_dev_data *adata = dev_get_drvdata(dev); 260 struct acp_stream *stream = substream->runtime->private_data; 261 262 /* Remove entry from list */ 263 spin_lock_irq(&adata->acp_lock); 264 list_del(&stream->list); 265 spin_unlock_irq(&adata->acp_lock); 266 kfree(stream); 267 268 return 0; 269 } 270 271 static const struct snd_soc_component_driver acp_pcm_component = { 272 .name = DRV_NAME, 273 .open = acp_dma_open, 274 .close = acp_dma_close, 275 .hw_params = acp_dma_hw_params, 276 .pointer = acp_dma_pointer, 277 .pcm_construct = acp_dma_new, 278 .legacy_dai_naming = 1, 279 }; 280 281 int acp_platform_register(struct device *dev) 282 { 283 struct acp_dev_data *adata = dev_get_drvdata(dev); 284 struct snd_soc_dai_driver; 285 unsigned int status; 286 287 status = devm_request_irq(dev, adata->i2s_irq, i2s_irq_handler, 288 IRQF_SHARED, "ACP_I2S_IRQ", adata); 289 if (status) { 290 dev_err(dev, "ACP I2S IRQ request failed\n"); 291 return status; 292 } 293 294 status = devm_snd_soc_register_component(dev, &acp_pcm_component, 295 adata->dai_driver, 296 adata->num_dai); 297 if (status) { 298 dev_err(dev, "Fail to register acp i2s component\n"); 299 return status; 300 } 301 302 INIT_LIST_HEAD(&adata->stream_list); 303 spin_lock_init(&adata->acp_lock); 304 305 return 0; 306 } 307 EXPORT_SYMBOL_NS_GPL(acp_platform_register, SND_SOC_ACP_COMMON); 308 309 int acp_platform_unregister(struct device *dev) 310 { 311 struct acp_dev_data *adata = dev_get_drvdata(dev); 312 313 if (adata->mach_dev) 314 platform_device_unregister(adata->mach_dev); 315 return 0; 316 } 317 EXPORT_SYMBOL_NS_GPL(acp_platform_unregister, SND_SOC_ACP_COMMON); 318 319 MODULE_DESCRIPTION("AMD ACP PCM Driver"); 320 MODULE_LICENSE("Dual BSD/GPL"); 321 MODULE_ALIAS(DRV_NAME); 322