sound/arm/pxa2xx-ac97.c

   1 /*
   2  * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
   3  *
   4  * Author:      Nicolas Pitre
   5  * Created:     Dec 02, 2004
   6  * Copyright:   MontaVista Software Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/wait.h>
  19 #include <linux/clk.h>
  20 #include <linux/delay.h>
  21
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/ac97_codec.h>
  25 #include <sound/initval.h>
  26
  27 #include <asm/irq.h>
  28 #include <linux/mutex.h>
  29 #include <asm/hardware.h>
  30 #include <asm/arch/pxa-regs.h>
  31 #include <asm/arch/pxa2xx-gpio.h>
  32 #include <asm/arch/audio.h>
  33
  34 #include "pxa2xx-pcm.h"
  35
  36
  37 static DEFINE_MUTEX(car_mutex);
  38 static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
  39 static volatile long gsr_bits;
  40 static struct clk *ac97_clk;
  41 #ifdef CONFIG_PXA27x
  42 static struct clk *ac97conf_clk;
  43 #endif
  44
  45 /*
  46  * Beware PXA27x bugs:
  47  *
  48  *   o Slot 12 read from modem space will hang controller.
  49  *   o CDONE, SDONE interrupt fails after any slot 12 IO.
  50  *
  51  * We therefore have an hybrid approach for waiting on SDONE (interrupt or
  52  * 1 jiffy timeout if interrupt never comes).
  53  */
  54
  55 static unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
  56 {
  57         unsigned short val = -1;
  58         volatile u32 *reg_addr;
  59
  60         mutex_lock(&car_mutex);
  61
  62         /* set up primary or secondary codec space */
  63         reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
  64         reg_addr += (reg >> 1);
  65
  66         /* start read access across the ac97 link */
  67         GSR = GSR_CDONE | GSR_SDONE;
  68         gsr_bits = 0;
  69         val = *reg_addr;
  70         if (reg == AC97_GPIO_STATUS)
  71                 goto out;
  72         if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1) <= 0 &&
  73             !((GSR | gsr_bits) & GSR_SDONE)) {
  74                 printk(KERN_ERR "%s: read error (ac97_reg=%d GSR=%#lx)\n",
  75                                 __func__, reg, GSR | gsr_bits);
  76                 val = -1;
  77                 goto out;
  78         }
  79
  80         /* valid data now */
  81         GSR = GSR_CDONE | GSR_SDONE;
  82         gsr_bits = 0;
  83         val = *reg_addr;
  84         /* but we've just started another cycle... */
  85         wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
  86
  87 out:    mutex_unlock(&car_mutex);
  88         return val;
  89 }
  90
  91 static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
  92 {
  93         volatile u32 *reg_addr;
  94
  95         mutex_lock(&car_mutex);
  96
  97         /* set up primary or secondary codec space */
  98         reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
  99         reg_addr += (reg >> 1);
 100
 101         GSR = GSR_CDONE | GSR_SDONE;
 102         gsr_bits = 0;
 103         *reg_addr = val;
 104         if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1) <= 0 &&
 105             !((GSR | gsr_bits) & GSR_CDONE))
 106                 printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n",
 107                                 __func__, reg, GSR | gsr_bits);
 108
 109         mutex_unlock(&car_mutex);
 110 }
 111
 112 static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)
 113 {
 114         /* First, try cold reset */
 115 #ifdef CONFIG_PXA3xx
 116         int timeout;
 117
 118         /* Hold CLKBPB for 100us */
 119         GCR = 0;
 120         GCR = GCR_CLKBPB;
 121         udelay(100);
 122         GCR = 0;
 123 #endif
 124
 125         GCR &=  GCR_COLD_RST;  /* clear everything but nCRST */
 126         GCR &= ~GCR_COLD_RST;  /* then assert nCRST */
 127
 128         gsr_bits = 0;
 129 #ifdef CONFIG_PXA27x
 130         /* PXA27x Developers Manual section 13.5.2.2.1 */
 131         clk_enable(ac97conf_clk);
 132         udelay(5);
 133         clk_disable(ac97conf_clk);
 134         GCR = GCR_COLD_RST;
 135         udelay(50);
 136 #elif defined(CONFIG_PXA3xx)
 137         timeout = 1000;
 138         /* Can't use interrupts on PXA3xx */
 139         GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
 140
 141         GCR = GCR_WARM_RST | GCR_COLD_RST;
 142         while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--)
 143                 mdelay(10);
 144 #else
 145         GCR = GCR_COLD_RST;
 146         GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
 147         wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 148 #endif
 149
 150         if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
 151                 printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
 152                                  __func__, gsr_bits);
 153
 154                 /* let's try warm reset */
 155                 gsr_bits = 0;
 156 #ifdef CONFIG_PXA27x
 157                 /* warm reset broken on Bulverde,
 158                    so manually keep AC97 reset high */
 159                 pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH);
 160                 udelay(10);
 161                 GCR |= GCR_WARM_RST;
 162                 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 163                 udelay(500);
 164 #elif defined(CONFIG_PXA3xx)
 165                 timeout = 100;
 166                 /* Can't use interrupts */
 167                 GCR |= GCR_WARM_RST;
 168                 while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
 169                         mdelay(1);
 170 #else
 171                 GCR |= GCR_WARM_RST|GCR_PRIRDY_IEN|GCR_SECRDY_IEN;
 172                 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 173 #endif
 174
 175                 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
 176                         printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
 177                                          __func__, gsr_bits);
 178         }
 179
 180         GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
 181         GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
 182 }
 183
 184 static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
 185 {
 186         long status;
 187
 188         status = GSR;
 189         if (status) {
 190                 GSR = status;
 191                 gsr_bits |= status;
 192                 wake_up(&gsr_wq);
 193
 194 #ifdef CONFIG_PXA27x
 195                 /* Although we don't use those we still need to clear them
 196                    since they tend to spuriously trigger when MMC is used
 197                    (hardware bug? go figure)... */
 198                 MISR = MISR_EOC;
 199                 PISR = PISR_EOC;
 200                 MCSR = MCSR_EOC;
 201 #endif
 202
 203                 return IRQ_HANDLED;
 204         }
 205
 206         return IRQ_NONE;
 207 }
 208
 209 static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
 210         .read   = pxa2xx_ac97_read,
 211         .write  = pxa2xx_ac97_write,
 212         .reset  = pxa2xx_ac97_reset,
 213 };
 214
 215 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_out = {
 216         .name                   = "AC97 PCM out",
 217         .dev_addr               = __PREG(PCDR),
 218         .drcmr                  = &DRCMRTXPCDR,
 219         .dcmd                   = DCMD_INCSRCADDR | DCMD_FLOWTRG |
 220                                   DCMD_BURST32 | DCMD_WIDTH4,
 221 };
 222
 223 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_in = {
 224         .name                   = "AC97 PCM in",
 225         .dev_addr               = __PREG(PCDR),
 226         .drcmr                  = &DRCMRRXPCDR,
 227         .dcmd                   = DCMD_INCTRGADDR | DCMD_FLOWSRC |
 228                                   DCMD_BURST32 | DCMD_WIDTH4,
 229 };
 230
 231 static struct snd_pcm *pxa2xx_ac97_pcm;
 232 static struct snd_ac97 *pxa2xx_ac97_ac97;
 233
 234 static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream)
 235 {
 236         struct snd_pcm_runtime *runtime = substream->runtime;
 237         pxa2xx_audio_ops_t *platform_ops;
 238         int r;
 239
 240         runtime->hw.channels_min = 2;
 241         runtime->hw.channels_max = 2;
 242
 243         r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 244             AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
 245         runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
 246         snd_pcm_limit_hw_rates(runtime);
 247
 248         platform_ops = substream->pcm->card->dev->platform_data;
 249         if (platform_ops && platform_ops->startup)
 250                 return platform_ops->startup(substream, platform_ops->priv);
 251         else
 252                 return 0;
 253 }
 254
 255 static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream)
 256 {
 257         pxa2xx_audio_ops_t *platform_ops;
 258
 259         platform_ops = substream->pcm->card->dev->platform_data;
 260         if (platform_ops && platform_ops->shutdown)
 261                 platform_ops->shutdown(substream, platform_ops->priv);
 262 }
 263
 264 static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
 265 {
 266         struct snd_pcm_runtime *runtime = substream->runtime;
 267         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 268                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
 269         return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
 270 }
 271
 272 static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
 273         .playback_params        = &pxa2xx_ac97_pcm_out,
 274         .capture_params         = &pxa2xx_ac97_pcm_in,
 275         .startup                = pxa2xx_ac97_pcm_startup,
 276         .shutdown               = pxa2xx_ac97_pcm_shutdown,
 277         .prepare                = pxa2xx_ac97_pcm_prepare,
 278 };
 279
 280 #ifdef CONFIG_PM
 281
 282 static int pxa2xx_ac97_do_suspend(struct snd_card *card, pm_message_t state)
 283 {
 284         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 285
 286         snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
 287         snd_pcm_suspend_all(pxa2xx_ac97_pcm);
 288         snd_ac97_suspend(pxa2xx_ac97_ac97);
 289         if (platform_ops && platform_ops->suspend)
 290                 platform_ops->suspend(platform_ops->priv);
 291         GCR |= GCR_ACLINK_OFF;
 292         clk_disable(ac97_clk);
 293
 294         return 0;
 295 }
 296
 297 static int pxa2xx_ac97_do_resume(struct snd_card *card)
 298 {
 299         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 300
 301         clk_enable(ac97_clk);
 302         if (platform_ops && platform_ops->resume)
 303                 platform_ops->resume(platform_ops->priv);
 304         snd_ac97_resume(pxa2xx_ac97_ac97);
 305         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 306
 307         return 0;
 308 }
 309
 310 static int pxa2xx_ac97_suspend(struct platform_device *dev, pm_message_t state)
 311 {
 312         struct snd_card *card = platform_get_drvdata(dev);
 313         int ret = 0;
 314
 315         if (card)
 316                 ret = pxa2xx_ac97_do_suspend(card, PMSG_SUSPEND);
 317
 318         return ret;
 319 }
 320
 321 static int pxa2xx_ac97_resume(struct platform_device *dev)
 322 {
 323         struct snd_card *card = platform_get_drvdata(dev);
 324         int ret = 0;
 325
 326         if (card)
 327                 ret = pxa2xx_ac97_do_resume(card);
 328
 329         return ret;
 330 }
 331
 332 #else
 333 #define pxa2xx_ac97_suspend     NULL
 334 #define pxa2xx_ac97_resume      NULL
 335 #endif
 336
 337 static int __devinit pxa2xx_ac97_probe(struct platform_device *dev)
 338 {
 339         struct snd_card *card;
 340         struct snd_ac97_bus *ac97_bus;
 341         struct snd_ac97_template ac97_template;
 342         int ret;
 343
 344         ret = -ENOMEM;
 345         card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 346                             THIS_MODULE, 0);
 347         if (!card)
 348                 goto err;
 349
 350         card->dev = &dev->dev;
 351         strncpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
 352
 353         ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
 354         if (ret)
 355                 goto err;
 356
 357         ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, 0, "AC97", NULL);
 358         if (ret < 0)
 359                 goto err;
 360
 361         pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
 362         pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
 363         pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
 364         pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
 365 #ifdef CONFIG_PXA27x
 366         /* Use GPIO 113 as AC97 Reset on Bulverde */
 367         pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 368         ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK");
 369         if (IS_ERR(ac97conf_clk)) {
 370                 ret = PTR_ERR(ac97conf_clk);
 371                 ac97conf_clk = NULL;
 372                 goto err;
 373         }
 374 #endif
 375
 376         ac97_clk = clk_get(&dev->dev, "AC97CLK");
 377         if (IS_ERR(ac97_clk)) {
 378                 ret = PTR_ERR(ac97_clk);
 379                 ac97_clk = NULL;
 380                 goto err;
 381         }
 382         clk_enable(ac97_clk);
 383
 384         ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
 385         if (ret)
 386                 goto err;
 387         memset(&ac97_template, 0, sizeof(ac97_template));
 388         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
 389         if (ret)
 390                 goto err;
 391
 392         snprintf(card->shortname, sizeof(card->shortname),
 393                  "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
 394         snprintf(card->longname, sizeof(card->longname),
 395                  "%s (%s)", dev->dev.driver->name, card->mixername);
 396
 397         snd_card_set_dev(card, &dev->dev);
 398         ret = snd_card_register(card);
 399         if (ret == 0) {
 400                 platform_set_drvdata(dev, card);
 401                 return 0;
 402         }
 403
 404  err:
 405         if (card)
 406                 snd_card_free(card);
 407         if (ac97_clk) {
 408                 GCR |= GCR_ACLINK_OFF;
 409                 free_irq(IRQ_AC97, NULL);
 410                 clk_disable(ac97_clk);
 411                 clk_put(ac97_clk);
 412                 ac97_clk = NULL;
 413         }
 414 #ifdef CONFIG_PXA27x
 415         if (ac97conf_clk) {
 416                 clk_put(ac97conf_clk);
 417                 ac97conf_clk = NULL;
 418         }
 419 #endif
 420         return ret;
 421 }
 422
 423 static int __devexit pxa2xx_ac97_remove(struct platform_device *dev)
 424 {
 425         struct snd_card *card = platform_get_drvdata(dev);
 426
 427         if (card) {
 428                 snd_card_free(card);
 429                 platform_set_drvdata(dev, NULL);
 430                 GCR |= GCR_ACLINK_OFF;
 431                 free_irq(IRQ_AC97, NULL);
 432                 clk_disable(ac97_clk);
 433                 clk_put(ac97_clk);
 434                 ac97_clk = NULL;
 435 #ifdef CONFIG_PXA27x
 436                 clk_put(ac97conf_clk);
 437                 ac97conf_clk = NULL;
 438 #endif
 439         }
 440
 441         return 0;
 442 }
 443
 444 static struct platform_driver pxa2xx_ac97_driver = {
 445         .probe          = pxa2xx_ac97_probe,
 446         .remove         = __devexit_p(pxa2xx_ac97_remove),
 447         .suspend        = pxa2xx_ac97_suspend,
 448         .resume         = pxa2xx_ac97_resume,
 449         .driver         = {
 450                 .name   = "pxa2xx-ac97",
 451                 .owner  = THIS_MODULE,
 452         },
 453 };
 454
 455 static int __init pxa2xx_ac97_init(void)
 456 {
 457         return platform_driver_register(&pxa2xx_ac97_driver);
 458 }
 459
 460 static void __exit pxa2xx_ac97_exit(void)
 461 {
 462         platform_driver_unregister(&pxa2xx_ac97_driver);
 463 }
 464
 465 module_init(pxa2xx_ac97_init);
 466 module_exit(pxa2xx_ac97_exit);
 467
 468 MODULE_AUTHOR("Nicolas Pitre");
 469 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
 470 MODULE_LICENSE("GPL");
 471 MODULE_ALIAS("platform:pxa2xx-ac97");