1 // SPDX-License-Identifier: (GPL-2.0 OR MIT) 2 // 3 // Copyright (c) 2018 BayLibre, SAS. 4 // Author: Jerome Brunet <jbrunet@baylibre.com> 5 6 #include <linux/clk.h> 7 #include <linux/of_irq.h> 8 #include <linux/of_platform.h> 9 #include <linux/module.h> 10 #include <linux/regmap.h> 11 #include <linux/reset.h> 12 #include <sound/pcm_params.h> 13 #include <sound/soc.h> 14 #include <sound/soc-dai.h> 15 16 #include "axg-fifo.h" 17 18 /* 19 * This file implements the platform operations common to the playback and 20 * capture frontend DAI. The logic behind this two types of fifo is very 21 * similar but some difference exist. 22 * These differences are handled in the respective DAI drivers 23 */ 24 25 static struct snd_pcm_hardware axg_fifo_hw = { 26 .info = (SNDRV_PCM_INFO_INTERLEAVED | 27 SNDRV_PCM_INFO_MMAP | 28 SNDRV_PCM_INFO_MMAP_VALID | 29 SNDRV_PCM_INFO_BLOCK_TRANSFER | 30 SNDRV_PCM_INFO_PAUSE | 31 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP), 32 .formats = AXG_FIFO_FORMATS, 33 .rate_min = 5512, 34 .rate_max = 192000, 35 .channels_min = 1, 36 .channels_max = AXG_FIFO_CH_MAX, 37 .period_bytes_min = AXG_FIFO_BURST, 38 .period_bytes_max = UINT_MAX, 39 .periods_min = 2, 40 .periods_max = UINT_MAX, 41 42 /* No real justification for this */ 43 .buffer_bytes_max = 1 * 1024 * 1024, 44 }; 45 46 static struct snd_soc_dai *axg_fifo_dai(struct snd_pcm_substream *ss) 47 { 48 struct snd_soc_pcm_runtime *rtd = ss->private_data; 49 50 return asoc_rtd_to_cpu(rtd, 0); 51 } 52 53 static struct axg_fifo *axg_fifo_data(struct snd_pcm_substream *ss) 54 { 55 struct snd_soc_dai *dai = axg_fifo_dai(ss); 56 57 return snd_soc_dai_get_drvdata(dai); 58 } 59 60 static struct device *axg_fifo_dev(struct snd_pcm_substream *ss) 61 { 62 struct snd_soc_dai *dai = axg_fifo_dai(ss); 63 64 return dai->dev; 65 } 66 67 static void __dma_enable(struct axg_fifo *fifo, bool enable) 68 { 69 regmap_update_bits(fifo->map, FIFO_CTRL0, CTRL0_DMA_EN, 70 enable ? CTRL0_DMA_EN : 0); 71 } 72 73 int axg_fifo_pcm_trigger(struct snd_soc_component *component, 74 struct snd_pcm_substream *ss, int cmd) 75 { 76 struct axg_fifo *fifo = axg_fifo_data(ss); 77 78 switch (cmd) { 79 case SNDRV_PCM_TRIGGER_START: 80 case SNDRV_PCM_TRIGGER_RESUME: 81 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 82 __dma_enable(fifo, true); 83 break; 84 case SNDRV_PCM_TRIGGER_SUSPEND: 85 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 86 case SNDRV_PCM_TRIGGER_STOP: 87 __dma_enable(fifo, false); 88 break; 89 default: 90 return -EINVAL; 91 } 92 93 return 0; 94 } 95 EXPORT_SYMBOL_GPL(axg_fifo_pcm_trigger); 96 97 snd_pcm_uframes_t axg_fifo_pcm_pointer(struct snd_soc_component *component, 98 struct snd_pcm_substream *ss) 99 { 100 struct axg_fifo *fifo = axg_fifo_data(ss); 101 struct snd_pcm_runtime *runtime = ss->runtime; 102 unsigned int addr; 103 104 regmap_read(fifo->map, FIFO_STATUS2, &addr); 105 106 return bytes_to_frames(runtime, addr - (unsigned int)runtime->dma_addr); 107 } 108 EXPORT_SYMBOL_GPL(axg_fifo_pcm_pointer); 109 110 int axg_fifo_pcm_hw_params(struct snd_soc_component *component, 111 struct snd_pcm_substream *ss, 112 struct snd_pcm_hw_params *params) 113 { 114 struct snd_pcm_runtime *runtime = ss->runtime; 115 struct axg_fifo *fifo = axg_fifo_data(ss); 116 unsigned int burst_num, period, threshold, irq_en; 117 dma_addr_t end_ptr; 118 119 period = params_period_bytes(params); 120 121 /* Setup dma memory pointers */ 122 end_ptr = runtime->dma_addr + runtime->dma_bytes - AXG_FIFO_BURST; 123 regmap_write(fifo->map, FIFO_START_ADDR, runtime->dma_addr); 124 regmap_write(fifo->map, FIFO_FINISH_ADDR, end_ptr); 125 126 /* Setup interrupt periodicity */ 127 burst_num = period / AXG_FIFO_BURST; 128 regmap_write(fifo->map, FIFO_INT_ADDR, burst_num); 129 130 /* 131 * Start the fifo request on the smallest of the following: 132 * - Half the fifo size 133 * - Half the period size 134 */ 135 threshold = min(period / 2, fifo->depth / 2); 136 137 /* 138 * With the threshold in bytes, register value is: 139 * V = (threshold / burst) - 1 140 */ 141 threshold /= AXG_FIFO_BURST; 142 regmap_field_write(fifo->field_threshold, 143 threshold ? threshold - 1 : 0); 144 145 /* Enable irq if necessary */ 146 irq_en = runtime->no_period_wakeup ? 0 : FIFO_INT_COUNT_REPEAT; 147 regmap_update_bits(fifo->map, FIFO_CTRL0, 148 CTRL0_INT_EN(FIFO_INT_COUNT_REPEAT), 149 CTRL0_INT_EN(irq_en)); 150 151 return 0; 152 } 153 EXPORT_SYMBOL_GPL(axg_fifo_pcm_hw_params); 154 155 int g12a_fifo_pcm_hw_params(struct snd_soc_component *component, 156 struct snd_pcm_substream *ss, 157 struct snd_pcm_hw_params *params) 158 { 159 struct axg_fifo *fifo = axg_fifo_data(ss); 160 struct snd_pcm_runtime *runtime = ss->runtime; 161 int ret; 162 163 ret = axg_fifo_pcm_hw_params(component, ss, params); 164 if (ret) 165 return ret; 166 167 /* Set the initial memory address of the DMA */ 168 regmap_write(fifo->map, FIFO_INIT_ADDR, runtime->dma_addr); 169 170 return 0; 171 } 172 EXPORT_SYMBOL_GPL(g12a_fifo_pcm_hw_params); 173 174 int axg_fifo_pcm_hw_free(struct snd_soc_component *component, 175 struct snd_pcm_substream *ss) 176 { 177 struct axg_fifo *fifo = axg_fifo_data(ss); 178 179 /* Disable the block count irq */ 180 regmap_update_bits(fifo->map, FIFO_CTRL0, 181 CTRL0_INT_EN(FIFO_INT_COUNT_REPEAT), 0); 182 183 return 0; 184 } 185 EXPORT_SYMBOL_GPL(axg_fifo_pcm_hw_free); 186 187 static void axg_fifo_ack_irq(struct axg_fifo *fifo, u8 mask) 188 { 189 regmap_update_bits(fifo->map, FIFO_CTRL1, 190 CTRL1_INT_CLR(FIFO_INT_MASK), 191 CTRL1_INT_CLR(mask)); 192 193 /* Clear must also be cleared */ 194 regmap_update_bits(fifo->map, FIFO_CTRL1, 195 CTRL1_INT_CLR(FIFO_INT_MASK), 196 0); 197 } 198 199 static irqreturn_t axg_fifo_pcm_irq_block(int irq, void *dev_id) 200 { 201 struct snd_pcm_substream *ss = dev_id; 202 struct axg_fifo *fifo = axg_fifo_data(ss); 203 unsigned int status; 204 205 regmap_read(fifo->map, FIFO_STATUS1, &status); 206 207 status = STATUS1_INT_STS(status) & FIFO_INT_MASK; 208 if (status & FIFO_INT_COUNT_REPEAT) 209 snd_pcm_period_elapsed(ss); 210 else 211 dev_dbg(axg_fifo_dev(ss), "unexpected irq - STS 0x%02x\n", 212 status); 213 214 /* Ack irqs */ 215 axg_fifo_ack_irq(fifo, status); 216 217 return IRQ_RETVAL(status); 218 } 219 220 int axg_fifo_pcm_open(struct snd_soc_component *component, 221 struct snd_pcm_substream *ss) 222 { 223 struct axg_fifo *fifo = axg_fifo_data(ss); 224 struct device *dev = axg_fifo_dev(ss); 225 int ret; 226 227 snd_soc_set_runtime_hwparams(ss, &axg_fifo_hw); 228 229 /* 230 * Make sure the buffer and period size are multiple of the FIFO 231 * burst 232 */ 233 ret = snd_pcm_hw_constraint_step(ss->runtime, 0, 234 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 235 AXG_FIFO_BURST); 236 if (ret) 237 return ret; 238 239 ret = snd_pcm_hw_constraint_step(ss->runtime, 0, 240 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 241 AXG_FIFO_BURST); 242 if (ret) 243 return ret; 244 245 ret = request_irq(fifo->irq, axg_fifo_pcm_irq_block, 0, 246 dev_name(dev), ss); 247 if (ret) 248 return ret; 249 250 /* Enable pclk to access registers and clock the fifo ip */ 251 ret = clk_prepare_enable(fifo->pclk); 252 if (ret) 253 goto free_irq; 254 255 /* Setup status2 so it reports the memory pointer */ 256 regmap_update_bits(fifo->map, FIFO_CTRL1, 257 CTRL1_STATUS2_SEL_MASK, 258 CTRL1_STATUS2_SEL(STATUS2_SEL_DDR_READ)); 259 260 /* Make sure the dma is initially disabled */ 261 __dma_enable(fifo, false); 262 263 /* Disable irqs until params are ready */ 264 regmap_update_bits(fifo->map, FIFO_CTRL0, 265 CTRL0_INT_EN(FIFO_INT_MASK), 0); 266 267 /* Clear any pending interrupt */ 268 axg_fifo_ack_irq(fifo, FIFO_INT_MASK); 269 270 /* Take memory arbitror out of reset */ 271 ret = reset_control_deassert(fifo->arb); 272 if (ret) 273 goto free_clk; 274 275 return 0; 276 277 free_clk: 278 clk_disable_unprepare(fifo->pclk); 279 free_irq: 280 free_irq(fifo->irq, ss); 281 return ret; 282 } 283 EXPORT_SYMBOL_GPL(axg_fifo_pcm_open); 284 285 int axg_fifo_pcm_close(struct snd_soc_component *component, 286 struct snd_pcm_substream *ss) 287 { 288 struct axg_fifo *fifo = axg_fifo_data(ss); 289 int ret; 290 291 /* Put the memory arbitror back in reset */ 292 ret = reset_control_assert(fifo->arb); 293 294 /* Disable fifo ip and register access */ 295 clk_disable_unprepare(fifo->pclk); 296 297 /* remove IRQ */ 298 free_irq(fifo->irq, ss); 299 300 return ret; 301 } 302 EXPORT_SYMBOL_GPL(axg_fifo_pcm_close); 303 304 int axg_fifo_pcm_new(struct snd_soc_pcm_runtime *rtd, unsigned int type) 305 { 306 struct snd_card *card = rtd->card->snd_card; 307 size_t size = axg_fifo_hw.buffer_bytes_max; 308 309 snd_pcm_set_managed_buffer(rtd->pcm->streams[type].substream, 310 SNDRV_DMA_TYPE_DEV, card->dev, 311 size, size); 312 return 0; 313 } 314 EXPORT_SYMBOL_GPL(axg_fifo_pcm_new); 315 316 static const struct regmap_config axg_fifo_regmap_cfg = { 317 .reg_bits = 32, 318 .val_bits = 32, 319 .reg_stride = 4, 320 .max_register = FIFO_CTRL2, 321 }; 322 323 int axg_fifo_probe(struct platform_device *pdev) 324 { 325 struct device *dev = &pdev->dev; 326 const struct axg_fifo_match_data *data; 327 struct axg_fifo *fifo; 328 void __iomem *regs; 329 int ret; 330 331 data = of_device_get_match_data(dev); 332 if (!data) { 333 dev_err(dev, "failed to match device\n"); 334 return -ENODEV; 335 } 336 337 fifo = devm_kzalloc(dev, sizeof(*fifo), GFP_KERNEL); 338 if (!fifo) 339 return -ENOMEM; 340 platform_set_drvdata(pdev, fifo); 341 342 regs = devm_platform_ioremap_resource(pdev, 0); 343 if (IS_ERR(regs)) 344 return PTR_ERR(regs); 345 346 fifo->map = devm_regmap_init_mmio(dev, regs, &axg_fifo_regmap_cfg); 347 if (IS_ERR(fifo->map)) { 348 dev_err(dev, "failed to init regmap: %ld\n", 349 PTR_ERR(fifo->map)); 350 return PTR_ERR(fifo->map); 351 } 352 353 fifo->pclk = devm_clk_get(dev, NULL); 354 if (IS_ERR(fifo->pclk)) { 355 if (PTR_ERR(fifo->pclk) != -EPROBE_DEFER) 356 dev_err(dev, "failed to get pclk: %ld\n", 357 PTR_ERR(fifo->pclk)); 358 return PTR_ERR(fifo->pclk); 359 } 360 361 fifo->arb = devm_reset_control_get_exclusive(dev, NULL); 362 if (IS_ERR(fifo->arb)) { 363 if (PTR_ERR(fifo->arb) != -EPROBE_DEFER) 364 dev_err(dev, "failed to get arb reset: %ld\n", 365 PTR_ERR(fifo->arb)); 366 return PTR_ERR(fifo->arb); 367 } 368 369 fifo->irq = of_irq_get(dev->of_node, 0); 370 if (fifo->irq <= 0) { 371 dev_err(dev, "failed to get irq: %d\n", fifo->irq); 372 return fifo->irq; 373 } 374 375 fifo->field_threshold = 376 devm_regmap_field_alloc(dev, fifo->map, data->field_threshold); 377 if (IS_ERR(fifo->field_threshold)) 378 return PTR_ERR(fifo->field_threshold); 379 380 ret = of_property_read_u32(dev->of_node, "amlogic,fifo-depth", 381 &fifo->depth); 382 if (ret) { 383 /* Error out for anything but a missing property */ 384 if (ret != -EINVAL) 385 return ret; 386 /* 387 * If the property is missing, it might be because of an old 388 * DT. In such case, assume the smallest known fifo depth 389 */ 390 fifo->depth = 256; 391 dev_warn(dev, "fifo depth not found, assume %u bytes\n", 392 fifo->depth); 393 } 394 395 return devm_snd_soc_register_component(dev, data->component_drv, 396 data->dai_drv, 1); 397 } 398 EXPORT_SYMBOL_GPL(axg_fifo_probe); 399 400 MODULE_DESCRIPTION("Amlogic AXG/G12A fifo driver"); 401 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); 402 MODULE_LICENSE("GPL v2"); 403