1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Au12x0/Au1550 PSC ALSA ASoC audio support. 4 * 5 * (c) 2007-2009 MSC Vertriebsges.m.b.H., 6 * Manuel Lauss <manuel.lauss@gmail.com> 7 * 8 * Au1xxx-PSC AC97 glue. 9 */ 10 11 #include <linux/init.h> 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 #include <linux/device.h> 15 #include <linux/delay.h> 16 #include <linux/mutex.h> 17 #include <linux/suspend.h> 18 #include <sound/core.h> 19 #include <sound/pcm.h> 20 #include <sound/initval.h> 21 #include <sound/soc.h> 22 #include <asm/mach-au1x00/au1000.h> 23 #include <asm/mach-au1x00/au1xxx_psc.h> 24 25 #include "psc.h" 26 27 /* how often to retry failed codec register reads/writes */ 28 #define AC97_RW_RETRIES 5 29 30 #define AC97_DIR \ 31 (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE) 32 33 #define AC97_RATES \ 34 SNDRV_PCM_RATE_8000_48000 35 36 #define AC97_FMTS \ 37 (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE) 38 39 #define AC97PCR_START(stype) \ 40 ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TS : PSC_AC97PCR_RS) 41 #define AC97PCR_STOP(stype) \ 42 ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TP : PSC_AC97PCR_RP) 43 #define AC97PCR_CLRFIFO(stype) \ 44 ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TC : PSC_AC97PCR_RC) 45 46 #define AC97STAT_BUSY(stype) \ 47 ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97STAT_TB : PSC_AC97STAT_RB) 48 49 /* instance data. There can be only one, MacLeod!!!! */ 50 static struct au1xpsc_audio_data *au1xpsc_ac97_workdata; 51 52 #if 0 53 54 /* this could theoretically work, but ac97->bus->card->private_data can be NULL 55 * when snd_ac97_mixer() is called; I don't know if the rest further down the 56 * chain are always valid either. 57 */ 58 static inline struct au1xpsc_audio_data *ac97_to_pscdata(struct snd_ac97 *x) 59 { 60 struct snd_soc_card *c = x->bus->card->private_data; 61 return snd_soc_dai_get_drvdata(c->snd_soc_rtd_to_cpu(rtd, 0)); 62 } 63 64 #else 65 66 #define ac97_to_pscdata(x) au1xpsc_ac97_workdata 67 68 #endif 69 70 /* AC97 controller reads codec register */ 71 static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97, 72 unsigned short reg) 73 { 74 struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97); 75 unsigned short retry, tmo; 76 unsigned long data; 77 78 __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata)); 79 wmb(); /* drain writebuffer */ 80 81 retry = AC97_RW_RETRIES; 82 do { 83 mutex_lock(&pscdata->lock); 84 85 __raw_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg), 86 AC97_CDC(pscdata)); 87 wmb(); /* drain writebuffer */ 88 89 tmo = 20; 90 do { 91 udelay(21); 92 if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD) 93 break; 94 } while (--tmo); 95 96 data = __raw_readl(AC97_CDC(pscdata)); 97 98 __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata)); 99 wmb(); /* drain writebuffer */ 100 101 mutex_unlock(&pscdata->lock); 102 103 if (reg != ((data >> 16) & 0x7f)) 104 tmo = 1; /* wrong register, try again */ 105 106 } while (--retry && !tmo); 107 108 return retry ? data & 0xffff : 0xffff; 109 } 110 111 /* AC97 controller writes to codec register */ 112 static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg, 113 unsigned short val) 114 { 115 struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97); 116 unsigned int tmo, retry; 117 118 __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata)); 119 wmb(); /* drain writebuffer */ 120 121 retry = AC97_RW_RETRIES; 122 do { 123 mutex_lock(&pscdata->lock); 124 125 __raw_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff), 126 AC97_CDC(pscdata)); 127 wmb(); /* drain writebuffer */ 128 129 tmo = 20; 130 do { 131 udelay(21); 132 if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD) 133 break; 134 } while (--tmo); 135 136 __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata)); 137 wmb(); /* drain writebuffer */ 138 139 mutex_unlock(&pscdata->lock); 140 } while (--retry && !tmo); 141 } 142 143 /* AC97 controller asserts a warm reset */ 144 static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97) 145 { 146 struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97); 147 148 __raw_writel(PSC_AC97RST_SNC, AC97_RST(pscdata)); 149 wmb(); /* drain writebuffer */ 150 msleep(10); 151 __raw_writel(0, AC97_RST(pscdata)); 152 wmb(); /* drain writebuffer */ 153 } 154 155 static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97) 156 { 157 struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97); 158 int i; 159 160 /* disable PSC during cold reset */ 161 __raw_writel(0, AC97_CFG(au1xpsc_ac97_workdata)); 162 wmb(); /* drain writebuffer */ 163 __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata)); 164 wmb(); /* drain writebuffer */ 165 166 /* issue cold reset */ 167 __raw_writel(PSC_AC97RST_RST, AC97_RST(pscdata)); 168 wmb(); /* drain writebuffer */ 169 msleep(500); 170 __raw_writel(0, AC97_RST(pscdata)); 171 wmb(); /* drain writebuffer */ 172 173 /* enable PSC */ 174 __raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata)); 175 wmb(); /* drain writebuffer */ 176 177 /* wait for PSC to indicate it's ready */ 178 i = 1000; 179 while (!((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i)) 180 msleep(1); 181 182 if (i == 0) { 183 printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n"); 184 return; 185 } 186 187 /* enable the ac97 function */ 188 __raw_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata)); 189 wmb(); /* drain writebuffer */ 190 191 /* wait for AC97 core to become ready */ 192 i = 1000; 193 while (!((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i)) 194 msleep(1); 195 if (i == 0) 196 printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n"); 197 } 198 199 /* AC97 controller operations */ 200 static struct snd_ac97_bus_ops psc_ac97_ops = { 201 .read = au1xpsc_ac97_read, 202 .write = au1xpsc_ac97_write, 203 .reset = au1xpsc_ac97_cold_reset, 204 .warm_reset = au1xpsc_ac97_warm_reset, 205 }; 206 207 static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream, 208 struct snd_pcm_hw_params *params, 209 struct snd_soc_dai *dai) 210 { 211 struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); 212 unsigned long r, ro, stat; 213 int chans, t, stype = substream->stream; 214 215 chans = params_channels(params); 216 217 r = ro = __raw_readl(AC97_CFG(pscdata)); 218 stat = __raw_readl(AC97_STAT(pscdata)); 219 220 /* already active? */ 221 if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) { 222 /* reject parameters not currently set up */ 223 if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) || 224 (pscdata->rate != params_rate(params))) 225 return -EINVAL; 226 } else { 227 228 /* set sample bitdepth: REG[24:21]=(BITS-2)/2 */ 229 r &= ~PSC_AC97CFG_LEN_MASK; 230 r |= PSC_AC97CFG_SET_LEN(params->msbits); 231 232 /* channels: enable slots for front L/R channel */ 233 if (stype == SNDRV_PCM_STREAM_PLAYBACK) { 234 r &= ~PSC_AC97CFG_TXSLOT_MASK; 235 r |= PSC_AC97CFG_TXSLOT_ENA(3); 236 r |= PSC_AC97CFG_TXSLOT_ENA(4); 237 } else { 238 r &= ~PSC_AC97CFG_RXSLOT_MASK; 239 r |= PSC_AC97CFG_RXSLOT_ENA(3); 240 r |= PSC_AC97CFG_RXSLOT_ENA(4); 241 } 242 243 /* do we need to poke the hardware? */ 244 if (!(r ^ ro)) 245 goto out; 246 247 /* ac97 engine is about to be disabled */ 248 mutex_lock(&pscdata->lock); 249 250 /* disable AC97 device controller first... */ 251 __raw_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata)); 252 wmb(); /* drain writebuffer */ 253 254 /* ...wait for it... */ 255 t = 100; 256 while ((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR) && --t) 257 msleep(1); 258 259 if (!t) 260 printk(KERN_ERR "PSC-AC97: can't disable!\n"); 261 262 /* ...write config... */ 263 __raw_writel(r, AC97_CFG(pscdata)); 264 wmb(); /* drain writebuffer */ 265 266 /* ...enable the AC97 controller again... */ 267 __raw_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata)); 268 wmb(); /* drain writebuffer */ 269 270 /* ...and wait for ready bit */ 271 t = 100; 272 while ((!(__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && --t) 273 msleep(1); 274 275 if (!t) 276 printk(KERN_ERR "PSC-AC97: can't enable!\n"); 277 278 mutex_unlock(&pscdata->lock); 279 280 pscdata->cfg = r; 281 pscdata->rate = params_rate(params); 282 } 283 284 out: 285 return 0; 286 } 287 288 static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream, 289 int cmd, struct snd_soc_dai *dai) 290 { 291 struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); 292 int ret, stype = substream->stream; 293 294 ret = 0; 295 296 switch (cmd) { 297 case SNDRV_PCM_TRIGGER_START: 298 case SNDRV_PCM_TRIGGER_RESUME: 299 __raw_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata)); 300 wmb(); /* drain writebuffer */ 301 __raw_writel(AC97PCR_START(stype), AC97_PCR(pscdata)); 302 wmb(); /* drain writebuffer */ 303 break; 304 case SNDRV_PCM_TRIGGER_STOP: 305 case SNDRV_PCM_TRIGGER_SUSPEND: 306 __raw_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata)); 307 wmb(); /* drain writebuffer */ 308 309 while (__raw_readl(AC97_STAT(pscdata)) & AC97STAT_BUSY(stype)) 310 asm volatile ("nop"); 311 312 __raw_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata)); 313 wmb(); /* drain writebuffer */ 314 315 break; 316 default: 317 ret = -EINVAL; 318 } 319 return ret; 320 } 321 322 static int au1xpsc_ac97_startup(struct snd_pcm_substream *substream, 323 struct snd_soc_dai *dai) 324 { 325 struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); 326 snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]); 327 return 0; 328 } 329 330 static int au1xpsc_ac97_probe(struct snd_soc_dai *dai) 331 { 332 return au1xpsc_ac97_workdata ? 0 : -ENODEV; 333 } 334 335 static const struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = { 336 .probe = au1xpsc_ac97_probe, 337 .startup = au1xpsc_ac97_startup, 338 .trigger = au1xpsc_ac97_trigger, 339 .hw_params = au1xpsc_ac97_hw_params, 340 }; 341 342 static const struct snd_soc_dai_driver au1xpsc_ac97_dai_template = { 343 .playback = { 344 .rates = AC97_RATES, 345 .formats = AC97_FMTS, 346 .channels_min = 2, 347 .channels_max = 2, 348 }, 349 .capture = { 350 .rates = AC97_RATES, 351 .formats = AC97_FMTS, 352 .channels_min = 2, 353 .channels_max = 2, 354 }, 355 .ops = &au1xpsc_ac97_dai_ops, 356 }; 357 358 static const struct snd_soc_component_driver au1xpsc_ac97_component = { 359 .name = "au1xpsc-ac97", 360 .legacy_dai_naming = 1, 361 }; 362 363 static int au1xpsc_ac97_drvprobe(struct platform_device *pdev) 364 { 365 int ret; 366 struct resource *dmares; 367 unsigned long sel; 368 struct au1xpsc_audio_data *wd; 369 370 wd = devm_kzalloc(&pdev->dev, sizeof(struct au1xpsc_audio_data), 371 GFP_KERNEL); 372 if (!wd) 373 return -ENOMEM; 374 375 mutex_init(&wd->lock); 376 377 wd->mmio = devm_platform_ioremap_resource(pdev, 0); 378 if (IS_ERR(wd->mmio)) 379 return PTR_ERR(wd->mmio); 380 381 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); 382 if (!dmares) 383 return -EBUSY; 384 wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start; 385 386 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1); 387 if (!dmares) 388 return -EBUSY; 389 wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start; 390 391 /* configuration: max dma trigger threshold, enable ac97 */ 392 wd->cfg = PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8 | 393 PSC_AC97CFG_DE_ENABLE; 394 395 /* preserve PSC clock source set up by platform */ 396 sel = __raw_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK; 397 __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); 398 wmb(); /* drain writebuffer */ 399 __raw_writel(0, PSC_SEL(wd)); 400 wmb(); /* drain writebuffer */ 401 __raw_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(wd)); 402 wmb(); /* drain writebuffer */ 403 404 /* name the DAI like this device instance ("au1xpsc-ac97.PSCINDEX") */ 405 memcpy(&wd->dai_drv, &au1xpsc_ac97_dai_template, 406 sizeof(struct snd_soc_dai_driver)); 407 wd->dai_drv.name = dev_name(&pdev->dev); 408 409 platform_set_drvdata(pdev, wd); 410 411 ret = snd_soc_set_ac97_ops(&psc_ac97_ops); 412 if (ret) 413 return ret; 414 415 ret = snd_soc_register_component(&pdev->dev, &au1xpsc_ac97_component, 416 &wd->dai_drv, 1); 417 if (ret) 418 return ret; 419 420 au1xpsc_ac97_workdata = wd; 421 return 0; 422 } 423 424 static void au1xpsc_ac97_drvremove(struct platform_device *pdev) 425 { 426 struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev); 427 428 snd_soc_unregister_component(&pdev->dev); 429 430 /* disable PSC completely */ 431 __raw_writel(0, AC97_CFG(wd)); 432 wmb(); /* drain writebuffer */ 433 __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); 434 wmb(); /* drain writebuffer */ 435 436 au1xpsc_ac97_workdata = NULL; /* MDEV */ 437 } 438 439 #ifdef CONFIG_PM 440 static int au1xpsc_ac97_drvsuspend(struct device *dev) 441 { 442 struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); 443 444 /* save interesting registers and disable PSC */ 445 wd->pm[0] = __raw_readl(PSC_SEL(wd)); 446 447 __raw_writel(0, AC97_CFG(wd)); 448 wmb(); /* drain writebuffer */ 449 __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); 450 wmb(); /* drain writebuffer */ 451 452 return 0; 453 } 454 455 static int au1xpsc_ac97_drvresume(struct device *dev) 456 { 457 struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); 458 459 /* restore PSC clock config */ 460 __raw_writel(wd->pm[0] | PSC_SEL_PS_AC97MODE, PSC_SEL(wd)); 461 wmb(); /* drain writebuffer */ 462 463 /* after this point the ac97 core will cold-reset the codec. 464 * During cold-reset the PSC is reinitialized and the last 465 * configuration set up in hw_params() is restored. 466 */ 467 return 0; 468 } 469 470 static const struct dev_pm_ops au1xpscac97_pmops = { 471 .suspend = au1xpsc_ac97_drvsuspend, 472 .resume = au1xpsc_ac97_drvresume, 473 }; 474 475 #define AU1XPSCAC97_PMOPS &au1xpscac97_pmops 476 477 #else 478 479 #define AU1XPSCAC97_PMOPS NULL 480 481 #endif 482 483 static struct platform_driver au1xpsc_ac97_driver = { 484 .driver = { 485 .name = "au1xpsc_ac97", 486 .pm = AU1XPSCAC97_PMOPS, 487 }, 488 .probe = au1xpsc_ac97_drvprobe, 489 .remove_new = au1xpsc_ac97_drvremove, 490 }; 491 492 module_platform_driver(au1xpsc_ac97_driver); 493 494 MODULE_LICENSE("GPL"); 495 MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver"); 496 MODULE_AUTHOR("Manuel Lauss"); 497 498