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_resource *rsrc = adata->rsrc; 95 struct acp_stream *stream; 96 u16 i2s_flag = 0; 97 u32 ext_intr_stat, ext_intr_stat1; 98 99 if (!adata) 100 return IRQ_NONE; 101 102 if (adata->rsrc->no_of_ctrls == 2) 103 ext_intr_stat1 = readl(ACP_EXTERNAL_INTR_STAT(adata, (rsrc->irqp_used - 1))); 104 105 ext_intr_stat = readl(ACP_EXTERNAL_INTR_STAT(adata, rsrc->irqp_used)); 106 107 spin_lock(&adata->acp_lock); 108 list_for_each_entry(stream, &adata->stream_list, list) { 109 if (ext_intr_stat & stream->irq_bit) { 110 writel(stream->irq_bit, 111 ACP_EXTERNAL_INTR_STAT(adata, rsrc->irqp_used)); 112 snd_pcm_period_elapsed(stream->substream); 113 i2s_flag = 1; 114 } 115 if (adata->rsrc->no_of_ctrls == 2) { 116 if (ext_intr_stat1 & stream->irq_bit) { 117 writel(stream->irq_bit, ACP_EXTERNAL_INTR_STAT(adata, 118 (rsrc->irqp_used - 1))); 119 snd_pcm_period_elapsed(stream->substream); 120 i2s_flag = 1; 121 } 122 } 123 } 124 spin_unlock(&adata->acp_lock); 125 if (i2s_flag) 126 return IRQ_HANDLED; 127 128 return IRQ_NONE; 129 } 130 131 static void config_pte_for_stream(struct acp_dev_data *adata, struct acp_stream *stream) 132 { 133 struct acp_resource *rsrc = adata->rsrc; 134 u32 pte_reg, pte_size, reg_val; 135 136 /* Use ATU base Group5 */ 137 pte_reg = ACPAXI2AXI_ATU_BASE_ADDR_GRP_5; 138 pte_size = ACPAXI2AXI_ATU_PAGE_SIZE_GRP_5; 139 stream->reg_offset = 0x02000000; 140 141 /* Group Enable */ 142 reg_val = rsrc->sram_pte_offset; 143 writel(reg_val | BIT(31), adata->acp_base + pte_reg); 144 writel(PAGE_SIZE_4K_ENABLE, adata->acp_base + pte_size); 145 writel(0x01, adata->acp_base + ACPAXI2AXI_ATU_CTRL); 146 } 147 148 static void config_acp_dma(struct acp_dev_data *adata, struct acp_stream *stream, int size) 149 { 150 struct snd_pcm_substream *substream = stream->substream; 151 struct acp_resource *rsrc = adata->rsrc; 152 dma_addr_t addr = substream->dma_buffer.addr; 153 int num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT); 154 u32 low, high, val; 155 u16 page_idx; 156 157 val = stream->pte_offset; 158 159 for (page_idx = 0; page_idx < num_pages; page_idx++) { 160 /* Load the low address of page int ACP SRAM through SRBM */ 161 low = lower_32_bits(addr); 162 high = upper_32_bits(addr); 163 writel(low, adata->acp_base + rsrc->scratch_reg_offset + val); 164 high |= BIT(31); 165 writel(high, adata->acp_base + rsrc->scratch_reg_offset + val + 4); 166 167 /* Move to next physically contiguous page */ 168 val += 8; 169 addr += PAGE_SIZE; 170 } 171 } 172 173 static int acp_dma_open(struct snd_soc_component *component, struct snd_pcm_substream *substream) 174 { 175 struct snd_pcm_runtime *runtime = substream->runtime; 176 struct device *dev = component->dev; 177 struct acp_dev_data *adata = dev_get_drvdata(dev); 178 struct acp_stream *stream; 179 int ret; 180 181 stream = kzalloc(sizeof(*stream), GFP_KERNEL); 182 if (!stream) 183 return -ENOMEM; 184 185 stream->substream = substream; 186 187 spin_lock_irq(&adata->acp_lock); 188 list_add_tail(&stream->list, &adata->stream_list); 189 spin_unlock_irq(&adata->acp_lock); 190 191 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 192 runtime->hw = acp_pcm_hardware_playback; 193 else 194 runtime->hw = acp_pcm_hardware_capture; 195 196 ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 197 if (ret < 0) { 198 dev_err(component->dev, "set integer constraint failed\n"); 199 kfree(stream); 200 return ret; 201 } 202 runtime->private_data = stream; 203 204 writel(1, ACP_EXTERNAL_INTR_ENB(adata)); 205 206 return ret; 207 } 208 209 static int acp_dma_hw_params(struct snd_soc_component *component, 210 struct snd_pcm_substream *substream, 211 struct snd_pcm_hw_params *params) 212 { 213 struct acp_dev_data *adata = snd_soc_component_get_drvdata(component); 214 struct acp_stream *stream = substream->runtime->private_data; 215 u64 size = params_buffer_bytes(params); 216 217 /* Configure ACP DMA block with params */ 218 config_pte_for_stream(adata, stream); 219 config_acp_dma(adata, stream, size); 220 221 return 0; 222 } 223 224 static snd_pcm_uframes_t acp_dma_pointer(struct snd_soc_component *component, 225 struct snd_pcm_substream *substream) 226 { 227 struct device *dev = component->dev; 228 struct acp_dev_data *adata = dev_get_drvdata(dev); 229 struct acp_stream *stream = substream->runtime->private_data; 230 u32 pos, buffersize; 231 u64 bytescount; 232 233 buffersize = frames_to_bytes(substream->runtime, 234 substream->runtime->buffer_size); 235 236 bytescount = acp_get_byte_count(adata, stream->dai_id, substream->stream); 237 238 if (bytescount > stream->bytescount) 239 bytescount -= stream->bytescount; 240 241 pos = do_div(bytescount, buffersize); 242 243 return bytes_to_frames(substream->runtime, pos); 244 } 245 246 static int acp_dma_new(struct snd_soc_component *component, 247 struct snd_soc_pcm_runtime *rtd) 248 { 249 struct device *parent = component->dev->parent; 250 251 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV, 252 parent, MIN_BUFFER, MAX_BUFFER); 253 return 0; 254 } 255 256 static int acp_dma_close(struct snd_soc_component *component, 257 struct snd_pcm_substream *substream) 258 { 259 struct device *dev = component->dev; 260 struct acp_dev_data *adata = dev_get_drvdata(dev); 261 struct acp_stream *stream = substream->runtime->private_data; 262 263 /* Remove entry from list */ 264 spin_lock_irq(&adata->acp_lock); 265 list_del(&stream->list); 266 spin_unlock_irq(&adata->acp_lock); 267 kfree(stream); 268 269 return 0; 270 } 271 272 static const struct snd_soc_component_driver acp_pcm_component = { 273 .name = DRV_NAME, 274 .open = acp_dma_open, 275 .close = acp_dma_close, 276 .hw_params = acp_dma_hw_params, 277 .pointer = acp_dma_pointer, 278 .pcm_construct = acp_dma_new, 279 .legacy_dai_naming = 1, 280 }; 281 282 int acp_platform_register(struct device *dev) 283 { 284 struct acp_dev_data *adata = dev_get_drvdata(dev); 285 struct snd_soc_dai_driver; 286 unsigned int status; 287 288 status = devm_request_irq(dev, adata->i2s_irq, i2s_irq_handler, 289 IRQF_SHARED, "ACP_I2S_IRQ", adata); 290 if (status) { 291 dev_err(dev, "ACP I2S IRQ request failed\n"); 292 return status; 293 } 294 295 status = devm_snd_soc_register_component(dev, &acp_pcm_component, 296 adata->dai_driver, 297 adata->num_dai); 298 if (status) { 299 dev_err(dev, "Fail to register acp i2s component\n"); 300 return status; 301 } 302 303 INIT_LIST_HEAD(&adata->stream_list); 304 spin_lock_init(&adata->acp_lock); 305 306 return 0; 307 } 308 EXPORT_SYMBOL_NS_GPL(acp_platform_register, SND_SOC_ACP_COMMON); 309 310 int acp_platform_unregister(struct device *dev) 311 { 312 struct acp_dev_data *adata = dev_get_drvdata(dev); 313 314 if (adata->mach_dev) 315 platform_device_unregister(adata->mach_dev); 316 return 0; 317 } 318 EXPORT_SYMBOL_NS_GPL(acp_platform_unregister, SND_SOC_ACP_COMMON); 319 320 MODULE_DESCRIPTION("AMD ACP PCM Driver"); 321 MODULE_LICENSE("Dual BSD/GPL"); 322 MODULE_ALIAS(DRV_NAME); 323