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 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 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_MIN_DEPTH, 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 rtd->cpu_dai; 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 static int axg_fifo_pcm_trigger(struct snd_pcm_substream *ss, int cmd) 74 { 75 struct axg_fifo *fifo = axg_fifo_data(ss); 76 77 switch (cmd) { 78 case SNDRV_PCM_TRIGGER_START: 79 case SNDRV_PCM_TRIGGER_RESUME: 80 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 81 __dma_enable(fifo, true); 82 break; 83 case SNDRV_PCM_TRIGGER_SUSPEND: 84 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 85 case SNDRV_PCM_TRIGGER_STOP: 86 __dma_enable(fifo, false); 87 break; 88 default: 89 return -EINVAL; 90 } 91 92 return 0; 93 } 94 95 static snd_pcm_uframes_t axg_fifo_pcm_pointer(struct snd_pcm_substream *ss) 96 { 97 struct axg_fifo *fifo = axg_fifo_data(ss); 98 struct snd_pcm_runtime *runtime = ss->runtime; 99 unsigned int addr; 100 101 regmap_read(fifo->map, FIFO_STATUS2, &addr); 102 103 return bytes_to_frames(runtime, addr - (unsigned int)runtime->dma_addr); 104 } 105 106 static int axg_fifo_pcm_hw_params(struct snd_pcm_substream *ss, 107 struct snd_pcm_hw_params *params) 108 { 109 struct snd_pcm_runtime *runtime = ss->runtime; 110 struct axg_fifo *fifo = axg_fifo_data(ss); 111 dma_addr_t end_ptr; 112 unsigned int burst_num; 113 int ret; 114 115 ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(params)); 116 if (ret < 0) 117 return ret; 118 119 /* Setup dma memory pointers */ 120 end_ptr = runtime->dma_addr + runtime->dma_bytes - AXG_FIFO_BURST; 121 regmap_write(fifo->map, FIFO_START_ADDR, runtime->dma_addr); 122 regmap_write(fifo->map, FIFO_FINISH_ADDR, end_ptr); 123 124 /* Setup interrupt periodicity */ 125 burst_num = params_period_bytes(params) / AXG_FIFO_BURST; 126 regmap_write(fifo->map, FIFO_INT_ADDR, burst_num); 127 128 /* Enable block count irq */ 129 regmap_update_bits(fifo->map, FIFO_CTRL0, 130 CTRL0_INT_EN(FIFO_INT_COUNT_REPEAT), 131 CTRL0_INT_EN(FIFO_INT_COUNT_REPEAT)); 132 133 return 0; 134 } 135 136 static int axg_fifo_pcm_hw_free(struct snd_pcm_substream *ss) 137 { 138 struct axg_fifo *fifo = axg_fifo_data(ss); 139 140 /* Disable the block count irq */ 141 regmap_update_bits(fifo->map, FIFO_CTRL0, 142 CTRL0_INT_EN(FIFO_INT_COUNT_REPEAT), 0); 143 144 return snd_pcm_lib_free_pages(ss); 145 } 146 147 static void axg_fifo_ack_irq(struct axg_fifo *fifo, u8 mask) 148 { 149 regmap_update_bits(fifo->map, FIFO_CTRL1, 150 CTRL1_INT_CLR(FIFO_INT_MASK), 151 CTRL1_INT_CLR(mask)); 152 153 /* Clear must also be cleared */ 154 regmap_update_bits(fifo->map, FIFO_CTRL1, 155 CTRL1_INT_CLR(FIFO_INT_MASK), 156 0); 157 } 158 159 static irqreturn_t axg_fifo_pcm_irq_block(int irq, void *dev_id) 160 { 161 struct snd_pcm_substream *ss = dev_id; 162 struct axg_fifo *fifo = axg_fifo_data(ss); 163 unsigned int status; 164 165 regmap_read(fifo->map, FIFO_STATUS1, &status); 166 167 status = STATUS1_INT_STS(status) & FIFO_INT_MASK; 168 if (status & FIFO_INT_COUNT_REPEAT) 169 snd_pcm_period_elapsed(ss); 170 else 171 dev_dbg(axg_fifo_dev(ss), "unexpected irq - STS 0x%02x\n", 172 status); 173 174 /* Ack irqs */ 175 axg_fifo_ack_irq(fifo, status); 176 177 return IRQ_RETVAL(status); 178 } 179 180 static int axg_fifo_pcm_open(struct snd_pcm_substream *ss) 181 { 182 struct axg_fifo *fifo = axg_fifo_data(ss); 183 struct device *dev = axg_fifo_dev(ss); 184 int ret; 185 186 snd_soc_set_runtime_hwparams(ss, &axg_fifo_hw); 187 188 /* 189 * Make sure the buffer and period size are multiple of the FIFO 190 * minimum depth size 191 */ 192 ret = snd_pcm_hw_constraint_step(ss->runtime, 0, 193 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 194 AXG_FIFO_MIN_DEPTH); 195 if (ret) 196 return ret; 197 198 ret = snd_pcm_hw_constraint_step(ss->runtime, 0, 199 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 200 AXG_FIFO_MIN_DEPTH); 201 if (ret) 202 return ret; 203 204 ret = request_irq(fifo->irq, axg_fifo_pcm_irq_block, 0, 205 dev_name(dev), ss); 206 if (ret) 207 return ret; 208 209 /* Enable pclk to access registers and clock the fifo ip */ 210 ret = clk_prepare_enable(fifo->pclk); 211 if (ret) 212 return ret; 213 214 /* Setup status2 so it reports the memory pointer */ 215 regmap_update_bits(fifo->map, FIFO_CTRL1, 216 CTRL1_STATUS2_SEL_MASK, 217 CTRL1_STATUS2_SEL(STATUS2_SEL_DDR_READ)); 218 219 /* Make sure the dma is initially disabled */ 220 __dma_enable(fifo, false); 221 222 /* Disable irqs until params are ready */ 223 regmap_update_bits(fifo->map, FIFO_CTRL0, 224 CTRL0_INT_EN(FIFO_INT_MASK), 0); 225 226 /* Clear any pending interrupt */ 227 axg_fifo_ack_irq(fifo, FIFO_INT_MASK); 228 229 /* Take memory arbitror out of reset */ 230 ret = reset_control_deassert(fifo->arb); 231 if (ret) 232 clk_disable_unprepare(fifo->pclk); 233 234 return ret; 235 } 236 237 static int axg_fifo_pcm_close(struct snd_pcm_substream *ss) 238 { 239 struct axg_fifo *fifo = axg_fifo_data(ss); 240 int ret; 241 242 /* Put the memory arbitror back in reset */ 243 ret = reset_control_assert(fifo->arb); 244 245 /* Disable fifo ip and register access */ 246 clk_disable_unprepare(fifo->pclk); 247 248 /* remove IRQ */ 249 free_irq(fifo->irq, ss); 250 251 return ret; 252 } 253 254 const struct snd_pcm_ops axg_fifo_pcm_ops = { 255 .open = axg_fifo_pcm_open, 256 .close = axg_fifo_pcm_close, 257 .ioctl = snd_pcm_lib_ioctl, 258 .hw_params = axg_fifo_pcm_hw_params, 259 .hw_free = axg_fifo_pcm_hw_free, 260 .pointer = axg_fifo_pcm_pointer, 261 .trigger = axg_fifo_pcm_trigger, 262 }; 263 EXPORT_SYMBOL_GPL(axg_fifo_pcm_ops); 264 265 int axg_fifo_pcm_new(struct snd_soc_pcm_runtime *rtd, unsigned int type) 266 { 267 struct snd_card *card = rtd->card->snd_card; 268 size_t size = axg_fifo_hw.buffer_bytes_max; 269 270 return snd_pcm_lib_preallocate_pages(rtd->pcm->streams[type].substream, 271 SNDRV_DMA_TYPE_DEV, card->dev, 272 size, size); 273 } 274 EXPORT_SYMBOL_GPL(axg_fifo_pcm_new); 275 276 static const struct regmap_config axg_fifo_regmap_cfg = { 277 .reg_bits = 32, 278 .val_bits = 32, 279 .reg_stride = 4, 280 .max_register = FIFO_STATUS2, 281 }; 282 283 int axg_fifo_probe(struct platform_device *pdev) 284 { 285 struct device *dev = &pdev->dev; 286 const struct axg_fifo_match_data *data; 287 struct axg_fifo *fifo; 288 struct resource *res; 289 void __iomem *regs; 290 291 data = of_device_get_match_data(dev); 292 if (!data) { 293 dev_err(dev, "failed to match device\n"); 294 return -ENODEV; 295 } 296 297 fifo = devm_kzalloc(dev, sizeof(*fifo), GFP_KERNEL); 298 if (!fifo) 299 return -ENOMEM; 300 platform_set_drvdata(pdev, fifo); 301 302 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 303 regs = devm_ioremap_resource(dev, res); 304 if (IS_ERR(regs)) 305 return PTR_ERR(regs); 306 307 fifo->map = devm_regmap_init_mmio(dev, regs, &axg_fifo_regmap_cfg); 308 if (IS_ERR(fifo->map)) { 309 dev_err(dev, "failed to init regmap: %ld\n", 310 PTR_ERR(fifo->map)); 311 return PTR_ERR(fifo->map); 312 } 313 314 fifo->pclk = devm_clk_get(dev, NULL); 315 if (IS_ERR(fifo->pclk)) { 316 if (PTR_ERR(fifo->pclk) != -EPROBE_DEFER) 317 dev_err(dev, "failed to get pclk: %ld\n", 318 PTR_ERR(fifo->pclk)); 319 return PTR_ERR(fifo->pclk); 320 } 321 322 fifo->arb = devm_reset_control_get_exclusive(dev, NULL); 323 if (IS_ERR(fifo->arb)) { 324 if (PTR_ERR(fifo->arb) != -EPROBE_DEFER) 325 dev_err(dev, "failed to get arb reset: %ld\n", 326 PTR_ERR(fifo->arb)); 327 return PTR_ERR(fifo->arb); 328 } 329 330 fifo->irq = of_irq_get(dev->of_node, 0); 331 if (fifo->irq <= 0) { 332 dev_err(dev, "failed to get irq: %d\n", fifo->irq); 333 return fifo->irq; 334 } 335 336 return devm_snd_soc_register_component(dev, data->component_drv, 337 data->dai_drv, 1); 338 } 339 EXPORT_SYMBOL_GPL(axg_fifo_probe); 340 341 MODULE_DESCRIPTION("Amlogic AXG fifo driver"); 342 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); 343 MODULE_LICENSE("GPL v2"); 344