1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * pxa2xx-i2s.c -- ALSA Soc Audio Layer 4 * 5 * Copyright 2005 Wolfson Microelectronics PLC. 6 * Author: Liam Girdwood 7 * lrg@slimlogic.co.uk 8 */ 9 10 #include <linux/init.h> 11 #include <linux/module.h> 12 #include <linux/device.h> 13 #include <linux/delay.h> 14 #include <linux/clk.h> 15 #include <linux/platform_device.h> 16 #include <linux/io.h> 17 #include <sound/core.h> 18 #include <sound/pcm.h> 19 #include <sound/initval.h> 20 #include <sound/soc.h> 21 #include <sound/pxa2xx-lib.h> 22 #include <sound/dmaengine_pcm.h> 23 24 #include <linux/platform_data/asoc-pxa.h> 25 26 #include "pxa2xx-i2s.h" 27 28 /* 29 * I2S Controller Register and Bit Definitions 30 */ 31 #define SACR0 (0x0000) /* Global Control Register */ 32 #define SACR1 (0x0004) /* Serial Audio I 2 S/MSB-Justified Control Register */ 33 #define SASR0 (0x000C) /* Serial Audio I 2 S/MSB-Justified Interface and FIFO Status Register */ 34 #define SAIMR (0x0014) /* Serial Audio Interrupt Mask Register */ 35 #define SAICR (0x0018) /* Serial Audio Interrupt Clear Register */ 36 #define SADIV (0x0060) /* Audio Clock Divider Register. */ 37 #define SADR (0x0080) /* Serial Audio Data Register (TX and RX FIFO access Register). */ 38 39 #define SACR0_RFTH(x) ((x) << 12) /* Rx FIFO Interrupt or DMA Trigger Threshold */ 40 #define SACR0_TFTH(x) ((x) << 8) /* Tx FIFO Interrupt or DMA Trigger Threshold */ 41 #define SACR0_STRF (1 << 5) /* FIFO Select for EFWR Special Function */ 42 #define SACR0_EFWR (1 << 4) /* Enable EFWR Function */ 43 #define SACR0_RST (1 << 3) /* FIFO, i2s Register Reset */ 44 #define SACR0_BCKD (1 << 2) /* Bit Clock Direction */ 45 #define SACR0_ENB (1 << 0) /* Enable I2S Link */ 46 #define SACR1_ENLBF (1 << 5) /* Enable Loopback */ 47 #define SACR1_DRPL (1 << 4) /* Disable Replaying Function */ 48 #define SACR1_DREC (1 << 3) /* Disable Recording Function */ 49 #define SACR1_AMSL (1 << 0) /* Specify Alternate Mode */ 50 51 #define SASR0_I2SOFF (1 << 7) /* Controller Status */ 52 #define SASR0_ROR (1 << 6) /* Rx FIFO Overrun */ 53 #define SASR0_TUR (1 << 5) /* Tx FIFO Underrun */ 54 #define SASR0_RFS (1 << 4) /* Rx FIFO Service Request */ 55 #define SASR0_TFS (1 << 3) /* Tx FIFO Service Request */ 56 #define SASR0_BSY (1 << 2) /* I2S Busy */ 57 #define SASR0_RNE (1 << 1) /* Rx FIFO Not Empty */ 58 #define SASR0_TNF (1 << 0) /* Tx FIFO Not Empty */ 59 60 #define SAICR_ROR (1 << 6) /* Clear Rx FIFO Overrun Interrupt */ 61 #define SAICR_TUR (1 << 5) /* Clear Tx FIFO Underrun Interrupt */ 62 63 #define SAIMR_ROR (1 << 6) /* Enable Rx FIFO Overrun Condition Interrupt */ 64 #define SAIMR_TUR (1 << 5) /* Enable Tx FIFO Underrun Condition Interrupt */ 65 #define SAIMR_RFS (1 << 4) /* Enable Rx FIFO Service Interrupt */ 66 #define SAIMR_TFS (1 << 3) /* Enable Tx FIFO Service Interrupt */ 67 68 struct pxa_i2s_port { 69 u32 sadiv; 70 u32 sacr0; 71 u32 sacr1; 72 u32 saimr; 73 int master; 74 u32 fmt; 75 }; 76 static struct pxa_i2s_port pxa_i2s; 77 static struct clk *clk_i2s; 78 static int clk_ena = 0; 79 static void __iomem *i2s_reg_base; 80 81 static struct snd_dmaengine_dai_dma_data pxa2xx_i2s_pcm_stereo_out = { 82 .addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, 83 .chan_name = "tx", 84 .maxburst = 32, 85 }; 86 87 static struct snd_dmaengine_dai_dma_data pxa2xx_i2s_pcm_stereo_in = { 88 .addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, 89 .chan_name = "rx", 90 .maxburst = 32, 91 }; 92 93 static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream, 94 struct snd_soc_dai *dai) 95 { 96 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 97 struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); 98 99 if (IS_ERR(clk_i2s)) 100 return PTR_ERR(clk_i2s); 101 102 if (!snd_soc_dai_active(cpu_dai)) 103 writel(0, i2s_reg_base + SACR0); 104 105 return 0; 106 } 107 108 /* wait for I2S controller to be ready */ 109 static int pxa_i2s_wait(void) 110 { 111 int i; 112 113 /* flush the Rx FIFO */ 114 for (i = 0; i < 16; i++) 115 readl(i2s_reg_base + SADR); 116 return 0; 117 } 118 119 static int pxa2xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai, 120 unsigned int fmt) 121 { 122 /* interface format */ 123 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 124 case SND_SOC_DAIFMT_I2S: 125 pxa_i2s.fmt = 0; 126 break; 127 case SND_SOC_DAIFMT_LEFT_J: 128 pxa_i2s.fmt = SACR1_AMSL; 129 break; 130 } 131 132 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 133 case SND_SOC_DAIFMT_CBS_CFS: 134 pxa_i2s.master = 1; 135 break; 136 case SND_SOC_DAIFMT_CBM_CFS: 137 pxa_i2s.master = 0; 138 break; 139 default: 140 break; 141 } 142 return 0; 143 } 144 145 static int pxa2xx_i2s_set_dai_sysclk(struct snd_soc_dai *cpu_dai, 146 int clk_id, unsigned int freq, int dir) 147 { 148 if (clk_id != PXA2XX_I2S_SYSCLK) 149 return -ENODEV; 150 151 return 0; 152 } 153 154 static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream, 155 struct snd_pcm_hw_params *params, 156 struct snd_soc_dai *dai) 157 { 158 struct snd_dmaengine_dai_dma_data *dma_data; 159 160 if (WARN_ON(IS_ERR(clk_i2s))) 161 return -EINVAL; 162 clk_prepare_enable(clk_i2s); 163 clk_ena = 1; 164 pxa_i2s_wait(); 165 166 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 167 dma_data = &pxa2xx_i2s_pcm_stereo_out; 168 else 169 dma_data = &pxa2xx_i2s_pcm_stereo_in; 170 171 snd_soc_dai_set_dma_data(dai, substream, dma_data); 172 173 /* is port used by another stream */ 174 if (!(SACR0 & SACR0_ENB)) { 175 writel(0, i2s_reg_base + SACR0); 176 if (pxa_i2s.master) 177 writel(readl(i2s_reg_base + SACR0) | (SACR0_BCKD), i2s_reg_base + SACR0); 178 179 writel(readl(i2s_reg_base + SACR0) | (SACR0_RFTH(14) | SACR0_TFTH(1)), i2s_reg_base + SACR0); 180 writel(readl(i2s_reg_base + SACR1) | (pxa_i2s.fmt), i2s_reg_base + SACR1); 181 } 182 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 183 writel(readl(i2s_reg_base + SAIMR) | (SAIMR_TFS), i2s_reg_base + SAIMR); 184 else 185 writel(readl(i2s_reg_base + SAIMR) | (SAIMR_RFS), i2s_reg_base + SAIMR); 186 187 switch (params_rate(params)) { 188 case 8000: 189 writel(0x48, i2s_reg_base + SADIV); 190 break; 191 case 11025: 192 writel(0x34, i2s_reg_base + SADIV); 193 break; 194 case 16000: 195 writel(0x24, i2s_reg_base + SADIV); 196 break; 197 case 22050: 198 writel(0x1a, i2s_reg_base + SADIV); 199 break; 200 case 44100: 201 writel(0xd, i2s_reg_base + SADIV); 202 break; 203 case 48000: 204 writel(0xc, i2s_reg_base + SADIV); 205 break; 206 case 96000: /* not in manual and possibly slightly inaccurate */ 207 writel(0x6, i2s_reg_base + SADIV); 208 break; 209 } 210 211 return 0; 212 } 213 214 static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd, 215 struct snd_soc_dai *dai) 216 { 217 int ret = 0; 218 219 switch (cmd) { 220 case SNDRV_PCM_TRIGGER_START: 221 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 222 writel(readl(i2s_reg_base + SACR1) & (~SACR1_DRPL), i2s_reg_base + SACR1); 223 else 224 writel(readl(i2s_reg_base + SACR1) & (~SACR1_DREC), i2s_reg_base + SACR1); 225 writel(readl(i2s_reg_base + SACR0) | (SACR0_ENB), i2s_reg_base + SACR0); 226 break; 227 case SNDRV_PCM_TRIGGER_RESUME: 228 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 229 case SNDRV_PCM_TRIGGER_STOP: 230 case SNDRV_PCM_TRIGGER_SUSPEND: 231 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 232 break; 233 default: 234 ret = -EINVAL; 235 } 236 237 return ret; 238 } 239 240 static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream, 241 struct snd_soc_dai *dai) 242 { 243 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 244 writel(readl(i2s_reg_base + SACR1) | (SACR1_DRPL), i2s_reg_base + SACR1); 245 writel(readl(i2s_reg_base + SAIMR) & (~SAIMR_TFS), i2s_reg_base + SAIMR); 246 } else { 247 writel(readl(i2s_reg_base + SACR1) | (SACR1_DREC), i2s_reg_base + SACR1); 248 writel(readl(i2s_reg_base + SAIMR) & (~SAIMR_RFS), i2s_reg_base + SAIMR); 249 } 250 251 if ((readl(i2s_reg_base + SACR1) & (SACR1_DREC | SACR1_DRPL)) == (SACR1_DREC | SACR1_DRPL)) { 252 writel(readl(i2s_reg_base + SACR0) & (~SACR0_ENB), i2s_reg_base + SACR0); 253 pxa_i2s_wait(); 254 if (clk_ena) { 255 clk_disable_unprepare(clk_i2s); 256 clk_ena = 0; 257 } 258 } 259 } 260 261 #ifdef CONFIG_PM 262 static int pxa2xx_soc_pcm_suspend(struct snd_soc_component *component) 263 { 264 /* store registers */ 265 pxa_i2s.sacr0 = readl(i2s_reg_base + SACR0); 266 pxa_i2s.sacr1 = readl(i2s_reg_base + SACR1); 267 pxa_i2s.saimr = readl(i2s_reg_base + SAIMR); 268 pxa_i2s.sadiv = readl(i2s_reg_base + SADIV); 269 270 /* deactivate link */ 271 writel(readl(i2s_reg_base + SACR0) & (~SACR0_ENB), i2s_reg_base + SACR0); 272 pxa_i2s_wait(); 273 return 0; 274 } 275 276 static int pxa2xx_soc_pcm_resume(struct snd_soc_component *component) 277 { 278 pxa_i2s_wait(); 279 280 writel(pxa_i2s.sacr0 & ~SACR0_ENB, i2s_reg_base + SACR0); 281 writel(pxa_i2s.sacr1, i2s_reg_base + SACR1); 282 writel(pxa_i2s.saimr, i2s_reg_base + SAIMR); 283 writel(pxa_i2s.sadiv, i2s_reg_base + SADIV); 284 285 writel(pxa_i2s.sacr0, i2s_reg_base + SACR0); 286 287 return 0; 288 } 289 290 #else 291 #define pxa2xx_soc_pcm_suspend NULL 292 #define pxa2xx_soc_pcm_resume NULL 293 #endif 294 295 static int pxa2xx_i2s_probe(struct snd_soc_dai *dai) 296 { 297 clk_i2s = clk_get(dai->dev, "I2SCLK"); 298 if (IS_ERR(clk_i2s)) 299 return PTR_ERR(clk_i2s); 300 301 /* 302 * PXA Developer's Manual: 303 * If SACR0[ENB] is toggled in the middle of a normal operation, 304 * the SACR0[RST] bit must also be set and cleared to reset all 305 * I2S controller registers. 306 */ 307 writel(SACR0_RST, i2s_reg_base + SACR0); 308 writel(0, i2s_reg_base + SACR0); 309 /* Make sure RPL and REC are disabled */ 310 writel(SACR1_DRPL | SACR1_DREC, i2s_reg_base + SACR1); 311 /* Along with FIFO servicing */ 312 writel(readl(i2s_reg_base + SAIMR) & (~(SAIMR_RFS | SAIMR_TFS)), i2s_reg_base + SAIMR); 313 314 snd_soc_dai_init_dma_data(dai, &pxa2xx_i2s_pcm_stereo_out, 315 &pxa2xx_i2s_pcm_stereo_in); 316 317 return 0; 318 } 319 320 static int pxa2xx_i2s_remove(struct snd_soc_dai *dai) 321 { 322 clk_put(clk_i2s); 323 clk_i2s = ERR_PTR(-ENOENT); 324 return 0; 325 } 326 327 #define PXA2XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 328 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \ 329 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000) 330 331 static const struct snd_soc_dai_ops pxa_i2s_dai_ops = { 332 .startup = pxa2xx_i2s_startup, 333 .shutdown = pxa2xx_i2s_shutdown, 334 .trigger = pxa2xx_i2s_trigger, 335 .hw_params = pxa2xx_i2s_hw_params, 336 .set_fmt = pxa2xx_i2s_set_dai_fmt, 337 .set_sysclk = pxa2xx_i2s_set_dai_sysclk, 338 }; 339 340 static struct snd_soc_dai_driver pxa_i2s_dai = { 341 .probe = pxa2xx_i2s_probe, 342 .remove = pxa2xx_i2s_remove, 343 .playback = { 344 .channels_min = 2, 345 .channels_max = 2, 346 .rates = PXA2XX_I2S_RATES, 347 .formats = SNDRV_PCM_FMTBIT_S16_LE,}, 348 .capture = { 349 .channels_min = 2, 350 .channels_max = 2, 351 .rates = PXA2XX_I2S_RATES, 352 .formats = SNDRV_PCM_FMTBIT_S16_LE,}, 353 .ops = &pxa_i2s_dai_ops, 354 .symmetric_rate = 1, 355 }; 356 357 static const struct snd_soc_component_driver pxa_i2s_component = { 358 .name = "pxa-i2s", 359 .pcm_construct = pxa2xx_soc_pcm_new, 360 .open = pxa2xx_soc_pcm_open, 361 .close = pxa2xx_soc_pcm_close, 362 .hw_params = pxa2xx_soc_pcm_hw_params, 363 .prepare = pxa2xx_soc_pcm_prepare, 364 .trigger = pxa2xx_soc_pcm_trigger, 365 .pointer = pxa2xx_soc_pcm_pointer, 366 .suspend = pxa2xx_soc_pcm_suspend, 367 .resume = pxa2xx_soc_pcm_resume, 368 }; 369 370 static int pxa2xx_i2s_drv_probe(struct platform_device *pdev) 371 { 372 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 373 374 if (!res) { 375 dev_err(&pdev->dev, "missing MMIO resource\n"); 376 return -ENXIO; 377 } 378 379 i2s_reg_base = devm_ioremap_resource(&pdev->dev, res); 380 if (IS_ERR(i2s_reg_base)) { 381 dev_err(&pdev->dev, "ioremap failed\n"); 382 return PTR_ERR(i2s_reg_base); 383 } 384 385 pxa2xx_i2s_pcm_stereo_out.addr = res->start + SADR; 386 pxa2xx_i2s_pcm_stereo_in.addr = res->start + SADR; 387 388 return devm_snd_soc_register_component(&pdev->dev, &pxa_i2s_component, 389 &pxa_i2s_dai, 1); 390 } 391 392 static struct platform_driver pxa2xx_i2s_driver = { 393 .probe = pxa2xx_i2s_drv_probe, 394 395 .driver = { 396 .name = "pxa2xx-i2s", 397 }, 398 }; 399 400 static int __init pxa2xx_i2s_init(void) 401 { 402 clk_i2s = ERR_PTR(-ENOENT); 403 return platform_driver_register(&pxa2xx_i2s_driver); 404 } 405 406 static void __exit pxa2xx_i2s_exit(void) 407 { 408 platform_driver_unregister(&pxa2xx_i2s_driver); 409 } 410 411 module_init(pxa2xx_i2s_init); 412 module_exit(pxa2xx_i2s_exit); 413 414 /* Module information */ 415 MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk"); 416 MODULE_DESCRIPTION("pxa2xx I2S SoC Interface"); 417 MODULE_LICENSE("GPL"); 418 MODULE_ALIAS("platform:pxa2xx-i2s"); 419