1 /* 2 * Au12x0/Au1550 PSC ALSA ASoC audio support. 3 * 4 * (c) 2007-2008 MSC Vertriebsges.m.b.H., 5 * Manuel Lauss <manuel.lauss@gmail.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * Au1xxx-PSC I2S glue. 12 * 13 * NOTE: all of these drivers can only work with a SINGLE instance 14 * of a PSC. Multiple independent audio devices are impossible 15 * with ASoC v1. 16 * NOTE: so far only PSC slave mode (bit- and frameclock) is supported. 17 */ 18 19 #include <linux/init.h> 20 #include <linux/module.h> 21 #include <linux/slab.h> 22 #include <linux/suspend.h> 23 #include <sound/core.h> 24 #include <sound/pcm.h> 25 #include <sound/initval.h> 26 #include <sound/soc.h> 27 #include <asm/mach-au1x00/au1000.h> 28 #include <asm/mach-au1x00/au1xxx_psc.h> 29 30 #include "psc.h" 31 32 /* supported I2S DAI hardware formats */ 33 #define AU1XPSC_I2S_DAIFMT \ 34 (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J | \ 35 SND_SOC_DAIFMT_NB_NF) 36 37 /* supported I2S direction */ 38 #define AU1XPSC_I2S_DIR \ 39 (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE) 40 41 #define AU1XPSC_I2S_RATES \ 42 SNDRV_PCM_RATE_8000_192000 43 44 #define AU1XPSC_I2S_FMTS \ 45 (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE) 46 47 #define I2SSTAT_BUSY(stype) \ 48 ((stype) == PCM_TX ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB) 49 #define I2SPCR_START(stype) \ 50 ((stype) == PCM_TX ? PSC_I2SPCR_TS : PSC_I2SPCR_RS) 51 #define I2SPCR_STOP(stype) \ 52 ((stype) == PCM_TX ? PSC_I2SPCR_TP : PSC_I2SPCR_RP) 53 #define I2SPCR_CLRFIFO(stype) \ 54 ((stype) == PCM_TX ? PSC_I2SPCR_TC : PSC_I2SPCR_RC) 55 56 57 /* instance data. There can be only one, MacLeod!!!! */ 58 static struct au1xpsc_audio_data *au1xpsc_i2s_workdata; 59 60 static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, 61 unsigned int fmt) 62 { 63 struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata; 64 unsigned long ct; 65 int ret; 66 67 ret = -EINVAL; 68 69 ct = pscdata->cfg; 70 71 ct &= ~(PSC_I2SCFG_XM | PSC_I2SCFG_MLJ); /* left-justified */ 72 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 73 case SND_SOC_DAIFMT_I2S: 74 ct |= PSC_I2SCFG_XM; /* enable I2S mode */ 75 break; 76 case SND_SOC_DAIFMT_MSB: 77 break; 78 case SND_SOC_DAIFMT_LSB: 79 ct |= PSC_I2SCFG_MLJ; /* LSB (right-) justified */ 80 break; 81 default: 82 goto out; 83 } 84 85 ct &= ~(PSC_I2SCFG_BI | PSC_I2SCFG_WI); /* IB-IF */ 86 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 87 case SND_SOC_DAIFMT_NB_NF: 88 ct |= PSC_I2SCFG_BI | PSC_I2SCFG_WI; 89 break; 90 case SND_SOC_DAIFMT_NB_IF: 91 ct |= PSC_I2SCFG_BI; 92 break; 93 case SND_SOC_DAIFMT_IB_NF: 94 ct |= PSC_I2SCFG_WI; 95 break; 96 case SND_SOC_DAIFMT_IB_IF: 97 break; 98 default: 99 goto out; 100 } 101 102 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 103 case SND_SOC_DAIFMT_CBM_CFM: /* CODEC master */ 104 ct |= PSC_I2SCFG_MS; /* PSC I2S slave mode */ 105 break; 106 case SND_SOC_DAIFMT_CBS_CFS: /* CODEC slave */ 107 ct &= ~PSC_I2SCFG_MS; /* PSC I2S Master mode */ 108 break; 109 default: 110 goto out; 111 } 112 113 pscdata->cfg = ct; 114 ret = 0; 115 out: 116 return ret; 117 } 118 119 static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream, 120 struct snd_pcm_hw_params *params, 121 struct snd_soc_dai *dai) 122 { 123 struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata; 124 125 int cfgbits; 126 unsigned long stat; 127 128 /* check if the PSC is already streaming data */ 129 stat = au_readl(I2S_STAT(pscdata)); 130 if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) { 131 /* reject parameters not currently set up in hardware */ 132 cfgbits = au_readl(I2S_CFG(pscdata)); 133 if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) || 134 (params_rate(params) != pscdata->rate)) 135 return -EINVAL; 136 } else { 137 /* set sample bitdepth */ 138 pscdata->cfg &= ~(0x1f << 4); 139 pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits); 140 /* remember current rate for other stream */ 141 pscdata->rate = params_rate(params); 142 } 143 return 0; 144 } 145 146 /* Configure PSC late: on my devel systems the codec is I2S master and 147 * supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit. ASoC 148 * uses aggressive PM and switches the codec off when it is not in use 149 * which also means the PSC unit doesn't get any clocks and is therefore 150 * dead. That's why this chunk here gets called from the trigger callback 151 * because I can be reasonably certain the codec is driving the clocks. 152 */ 153 static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata) 154 { 155 unsigned long tmo; 156 157 /* bring PSC out of sleep, and configure I2S unit */ 158 au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata)); 159 au_sync(); 160 161 tmo = 1000000; 162 while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo) 163 tmo--; 164 165 if (!tmo) 166 goto psc_err; 167 168 au_writel(0, I2S_CFG(pscdata)); 169 au_sync(); 170 au_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata)); 171 au_sync(); 172 173 /* wait for I2S controller to become ready */ 174 tmo = 1000000; 175 while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo) 176 tmo--; 177 178 if (tmo) 179 return 0; 180 181 psc_err: 182 au_writel(0, I2S_CFG(pscdata)); 183 au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata)); 184 au_sync(); 185 return -ETIMEDOUT; 186 } 187 188 static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype) 189 { 190 unsigned long tmo, stat; 191 int ret; 192 193 ret = 0; 194 195 /* if both TX and RX are idle, configure the PSC */ 196 stat = au_readl(I2S_STAT(pscdata)); 197 if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) { 198 ret = au1xpsc_i2s_configure(pscdata); 199 if (ret) 200 goto out; 201 } 202 203 au_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata)); 204 au_sync(); 205 au_writel(I2SPCR_START(stype), I2S_PCR(pscdata)); 206 au_sync(); 207 208 /* wait for start confirmation */ 209 tmo = 1000000; 210 while (!(au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo) 211 tmo--; 212 213 if (!tmo) { 214 au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata)); 215 au_sync(); 216 ret = -ETIMEDOUT; 217 } 218 out: 219 return ret; 220 } 221 222 static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype) 223 { 224 unsigned long tmo, stat; 225 226 au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata)); 227 au_sync(); 228 229 /* wait for stop confirmation */ 230 tmo = 1000000; 231 while ((au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo) 232 tmo--; 233 234 /* if both TX and RX are idle, disable PSC */ 235 stat = au_readl(I2S_STAT(pscdata)); 236 if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) { 237 au_writel(0, I2S_CFG(pscdata)); 238 au_sync(); 239 au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata)); 240 au_sync(); 241 } 242 return 0; 243 } 244 245 static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd, 246 struct snd_soc_dai *dai) 247 { 248 struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata; 249 int ret, stype = SUBSTREAM_TYPE(substream); 250 251 switch (cmd) { 252 case SNDRV_PCM_TRIGGER_START: 253 case SNDRV_PCM_TRIGGER_RESUME: 254 ret = au1xpsc_i2s_start(pscdata, stype); 255 break; 256 case SNDRV_PCM_TRIGGER_STOP: 257 case SNDRV_PCM_TRIGGER_SUSPEND: 258 ret = au1xpsc_i2s_stop(pscdata, stype); 259 break; 260 default: 261 ret = -EINVAL; 262 } 263 return ret; 264 } 265 266 static int au1xpsc_i2s_probe(struct platform_device *pdev, 267 struct snd_soc_dai *dai) 268 { 269 return au1xpsc_i2s_workdata ? 0 : -ENODEV; 270 } 271 272 static void au1xpsc_i2s_remove(struct platform_device *pdev, 273 struct snd_soc_dai *dai) 274 { 275 } 276 277 static struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = { 278 .trigger = au1xpsc_i2s_trigger, 279 .hw_params = au1xpsc_i2s_hw_params, 280 .set_fmt = au1xpsc_i2s_set_fmt, 281 }; 282 283 struct snd_soc_dai au1xpsc_i2s_dai = { 284 .name = "au1xpsc_i2s", 285 .probe = au1xpsc_i2s_probe, 286 .remove = au1xpsc_i2s_remove, 287 .playback = { 288 .rates = AU1XPSC_I2S_RATES, 289 .formats = AU1XPSC_I2S_FMTS, 290 .channels_min = 2, 291 .channels_max = 8, /* 2 without external help */ 292 }, 293 .capture = { 294 .rates = AU1XPSC_I2S_RATES, 295 .formats = AU1XPSC_I2S_FMTS, 296 .channels_min = 2, 297 .channels_max = 8, /* 2 without external help */ 298 }, 299 .ops = &au1xpsc_i2s_dai_ops, 300 }; 301 EXPORT_SYMBOL(au1xpsc_i2s_dai); 302 303 static int __init au1xpsc_i2s_drvprobe(struct platform_device *pdev) 304 { 305 struct resource *r; 306 unsigned long sel; 307 int ret; 308 struct au1xpsc_audio_data *wd; 309 310 if (au1xpsc_i2s_workdata) 311 return -EBUSY; 312 313 wd = kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL); 314 if (!wd) 315 return -ENOMEM; 316 317 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 318 if (!r) { 319 ret = -ENODEV; 320 goto out0; 321 } 322 323 ret = -EBUSY; 324 wd->ioarea = request_mem_region(r->start, r->end - r->start + 1, 325 "au1xpsc_i2s"); 326 if (!wd->ioarea) 327 goto out0; 328 329 wd->mmio = ioremap(r->start, 0xffff); 330 if (!wd->mmio) 331 goto out1; 332 333 /* preserve PSC clock source set up by platform (dev.platform_data 334 * is already occupied by soc layer) 335 */ 336 sel = au_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK; 337 au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); 338 au_sync(); 339 au_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(wd)); 340 au_writel(0, I2S_CFG(wd)); 341 au_sync(); 342 343 /* preconfigure: set max rx/tx fifo depths */ 344 wd->cfg |= PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8; 345 346 /* don't wait for I2S core to become ready now; clocks may not 347 * be running yet; depending on clock input for PSC a wait might 348 * time out. 349 */ 350 351 ret = snd_soc_register_dai(&au1xpsc_i2s_dai); 352 if (ret) 353 goto out1; 354 355 /* finally add the DMA device for this PSC */ 356 wd->dmapd = au1xpsc_pcm_add(pdev); 357 if (wd->dmapd) { 358 platform_set_drvdata(pdev, wd); 359 au1xpsc_i2s_workdata = wd; 360 return 0; 361 } 362 363 snd_soc_unregister_dai(&au1xpsc_i2s_dai); 364 out1: 365 release_resource(wd->ioarea); 366 kfree(wd->ioarea); 367 out0: 368 kfree(wd); 369 return ret; 370 } 371 372 static int __devexit au1xpsc_i2s_drvremove(struct platform_device *pdev) 373 { 374 struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev); 375 376 if (wd->dmapd) 377 au1xpsc_pcm_destroy(wd->dmapd); 378 379 snd_soc_unregister_dai(&au1xpsc_i2s_dai); 380 381 au_writel(0, I2S_CFG(wd)); 382 au_sync(); 383 au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); 384 au_sync(); 385 386 iounmap(wd->mmio); 387 release_resource(wd->ioarea); 388 kfree(wd->ioarea); 389 kfree(wd); 390 391 au1xpsc_i2s_workdata = NULL; /* MDEV */ 392 393 return 0; 394 } 395 396 #ifdef CONFIG_PM 397 static int au1xpsc_i2s_drvsuspend(struct device *dev) 398 { 399 struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); 400 401 /* save interesting register and disable PSC */ 402 wd->pm[0] = au_readl(PSC_SEL(wd)); 403 404 au_writel(0, I2S_CFG(wd)); 405 au_sync(); 406 au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); 407 au_sync(); 408 409 return 0; 410 } 411 412 static int au1xpsc_i2s_drvresume(struct device *dev) 413 { 414 struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); 415 416 /* select I2S mode and PSC clock */ 417 au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); 418 au_sync(); 419 au_writel(0, PSC_SEL(wd)); 420 au_sync(); 421 au_writel(wd->pm[0], PSC_SEL(wd)); 422 au_sync(); 423 424 return 0; 425 } 426 427 static struct dev_pm_ops au1xpsci2s_pmops = { 428 .suspend = au1xpsc_i2s_drvsuspend, 429 .resume = au1xpsc_i2s_drvresume, 430 }; 431 432 #define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops 433 434 #else 435 436 #define AU1XPSCI2S_PMOPS NULL 437 438 #endif 439 440 static struct platform_driver au1xpsc_i2s_driver = { 441 .driver = { 442 .name = "au1xpsc_i2s", 443 .owner = THIS_MODULE, 444 .pm = AU1XPSCI2S_PMOPS, 445 }, 446 .probe = au1xpsc_i2s_drvprobe, 447 .remove = __devexit_p(au1xpsc_i2s_drvremove), 448 }; 449 450 static int __init au1xpsc_i2s_load(void) 451 { 452 au1xpsc_i2s_workdata = NULL; 453 return platform_driver_register(&au1xpsc_i2s_driver); 454 } 455 456 static void __exit au1xpsc_i2s_unload(void) 457 { 458 platform_driver_unregister(&au1xpsc_i2s_driver); 459 } 460 461 module_init(au1xpsc_i2s_load); 462 module_exit(au1xpsc_i2s_unload); 463 464 MODULE_LICENSE("GPL"); 465 MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver"); 466 MODULE_AUTHOR("Manuel Lauss"); 467