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                                 __FUNCTION__, 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                                 __FUNCTION__, 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         GCR &=  GCR_COLD_RST;  /* clear everything but nCRST */
 116         GCR &= ~GCR_COLD_RST;  /* then assert nCRST */
 117
 118         gsr_bits = 0;
 119 #ifdef CONFIG_PXA27x
 120         /* PXA27x Developers Manual section 13.5.2.2.1 */
 121         clk_enable(ac97conf_clk);
 122         udelay(5);
 123         clk_disable(ac97conf_clk);
 124         GCR = GCR_COLD_RST;
 125         udelay(50);
 126 #else
 127         GCR = GCR_COLD_RST;
 128         GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
 129         wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 130 #endif
 131
 132         if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
 133                 printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
 134                                  __FUNCTION__, gsr_bits);
 135
 136                 /* let's try warm reset */
 137                 gsr_bits = 0;
 138 #ifdef CONFIG_PXA27x
 139                 /* warm reset broken on Bulverde,
 140                    so manually keep AC97 reset high */
 141                 pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH);
 142                 udelay(10);
 143                 GCR |= GCR_WARM_RST;
 144                 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 145                 udelay(500);
 146 #else
 147                 GCR |= GCR_WARM_RST|GCR_PRIRDY_IEN|GCR_SECRDY_IEN;
 148                 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 149 #endif
 150
 151                 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
 152                         printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
 153                                          __FUNCTION__, gsr_bits);
 154         }
 155
 156         GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
 157         GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
 158 }
 159
 160 static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
 161 {
 162         long status;
 163
 164         status = GSR;
 165         if (status) {
 166                 GSR = status;
 167                 gsr_bits |= status;
 168                 wake_up(&gsr_wq);
 169
 170 #ifdef CONFIG_PXA27x
 171                 /* Although we don't use those we still need to clear them
 172                    since they tend to spuriously trigger when MMC is used
 173                    (hardware bug? go figure)... */
 174                 MISR = MISR_EOC;
 175                 PISR = PISR_EOC;
 176                 MCSR = MCSR_EOC;
 177 #endif
 178
 179                 return IRQ_HANDLED;
 180         }
 181
 182         return IRQ_NONE;
 183 }
 184
 185 static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
 186         .read   = pxa2xx_ac97_read,
 187         .write  = pxa2xx_ac97_write,
 188         .reset  = pxa2xx_ac97_reset,
 189 };
 190
 191 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_out = {
 192         .name                   = "AC97 PCM out",
 193         .dev_addr               = __PREG(PCDR),
 194         .drcmr                  = &DRCMRTXPCDR,
 195         .dcmd                   = DCMD_INCSRCADDR | DCMD_FLOWTRG |
 196                                   DCMD_BURST32 | DCMD_WIDTH4,
 197 };
 198
 199 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_in = {
 200         .name                   = "AC97 PCM in",
 201         .dev_addr               = __PREG(PCDR),
 202         .drcmr                  = &DRCMRRXPCDR,
 203         .dcmd                   = DCMD_INCTRGADDR | DCMD_FLOWSRC |
 204                                   DCMD_BURST32 | DCMD_WIDTH4,
 205 };
 206
 207 static struct snd_pcm *pxa2xx_ac97_pcm;
 208 static struct snd_ac97 *pxa2xx_ac97_ac97;
 209
 210 static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream)
 211 {
 212         struct snd_pcm_runtime *runtime = substream->runtime;
 213         pxa2xx_audio_ops_t *platform_ops;
 214         int r;
 215
 216         runtime->hw.channels_min = 2;
 217         runtime->hw.channels_max = 2;
 218
 219         r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 220             AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
 221         runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
 222         snd_pcm_limit_hw_rates(runtime);
 223
 224         platform_ops = substream->pcm->card->dev->platform_data;
 225         if (platform_ops && platform_ops->startup)
 226                 return platform_ops->startup(substream, platform_ops->priv);
 227         else
 228                 return 0;
 229 }
 230
 231 static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream)
 232 {
 233         pxa2xx_audio_ops_t *platform_ops;
 234
 235         platform_ops = substream->pcm->card->dev->platform_data;
 236         if (platform_ops && platform_ops->shutdown)
 237                 platform_ops->shutdown(substream, platform_ops->priv);
 238 }
 239
 240 static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
 241 {
 242         struct snd_pcm_runtime *runtime = substream->runtime;
 243         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 244                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
 245         return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
 246 }
 247
 248 static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
 249         .playback_params        = &pxa2xx_ac97_pcm_out,
 250         .capture_params         = &pxa2xx_ac97_pcm_in,
 251         .startup                = pxa2xx_ac97_pcm_startup,
 252         .shutdown               = pxa2xx_ac97_pcm_shutdown,
 253         .prepare                = pxa2xx_ac97_pcm_prepare,
 254 };
 255
 256 #ifdef CONFIG_PM
 257
 258 static int pxa2xx_ac97_do_suspend(struct snd_card *card, pm_message_t state)
 259 {
 260         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 261
 262         snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
 263         snd_pcm_suspend_all(pxa2xx_ac97_pcm);
 264         snd_ac97_suspend(pxa2xx_ac97_ac97);
 265         if (platform_ops && platform_ops->suspend)
 266                 platform_ops->suspend(platform_ops->priv);
 267         GCR |= GCR_ACLINK_OFF;
 268         clk_disable(ac97_clk);
 269
 270         return 0;
 271 }
 272
 273 static int pxa2xx_ac97_do_resume(struct snd_card *card)
 274 {
 275         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 276
 277         clk_enable(ac97_clk);
 278         if (platform_ops && platform_ops->resume)
 279                 platform_ops->resume(platform_ops->priv);
 280         snd_ac97_resume(pxa2xx_ac97_ac97);
 281         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 282
 283         return 0;
 284 }
 285
 286 static int pxa2xx_ac97_suspend(struct platform_device *dev, pm_message_t state)
 287 {
 288         struct snd_card *card = platform_get_drvdata(dev);
 289         int ret = 0;
 290
 291         if (card)
 292                 ret = pxa2xx_ac97_do_suspend(card, PMSG_SUSPEND);
 293
 294         return ret;
 295 }
 296
 297 static int pxa2xx_ac97_resume(struct platform_device *dev)
 298 {
 299         struct snd_card *card = platform_get_drvdata(dev);
 300         int ret = 0;
 301
 302         if (card)
 303                 ret = pxa2xx_ac97_do_resume(card);
 304
 305         return ret;
 306 }
 307
 308 #else
 309 #define pxa2xx_ac97_suspend     NULL
 310 #define pxa2xx_ac97_resume      NULL
 311 #endif
 312
 313 static int __devinit pxa2xx_ac97_probe(struct platform_device *dev)
 314 {
 315         struct snd_card *card;
 316         struct snd_ac97_bus *ac97_bus;
 317         struct snd_ac97_template ac97_template;
 318         int ret;
 319
 320         ret = -ENOMEM;
 321         card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 322                             THIS_MODULE, 0);
 323         if (!card)
 324                 goto err;
 325
 326         card->dev = &dev->dev;
 327         strncpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
 328
 329         ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
 330         if (ret)
 331                 goto err;
 332
 333         ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, 0, "AC97", NULL);
 334         if (ret < 0)
 335                 goto err;
 336
 337         pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
 338         pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
 339         pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
 340         pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
 341 #ifdef CONFIG_PXA27x
 342         /* Use GPIO 113 as AC97 Reset on Bulverde */
 343         pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 344         ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK");
 345         if (IS_ERR(ac97conf_clk)) {
 346                 ret = PTR_ERR(ac97conf_clk);
 347                 ac97conf_clk = NULL;
 348                 goto err;
 349         }
 350 #endif
 351
 352         ac97_clk = clk_get(&dev->dev, "AC97CLK");
 353         if (IS_ERR(ac97_clk)) {
 354                 ret = PTR_ERR(ac97_clk);
 355                 ac97_clk = NULL;
 356                 goto err;
 357         }
 358         clk_enable(ac97_clk);
 359
 360         ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
 361         if (ret)
 362                 goto err;
 363         memset(&ac97_template, 0, sizeof(ac97_template));
 364         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
 365         if (ret)
 366                 goto err;
 367
 368         snprintf(card->shortname, sizeof(card->shortname),
 369                  "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
 370         snprintf(card->longname, sizeof(card->longname),
 371                  "%s (%s)", dev->dev.driver->name, card->mixername);
 372
 373         snd_card_set_dev(card, &dev->dev);
 374         ret = snd_card_register(card);
 375         if (ret == 0) {
 376                 platform_set_drvdata(dev, card);
 377                 return 0;
 378         }
 379
 380  err:
 381         if (card)
 382                 snd_card_free(card);
 383         if (ac97_clk) {
 384                 GCR |= GCR_ACLINK_OFF;
 385                 free_irq(IRQ_AC97, NULL);
 386                 clk_disable(ac97_clk);
 387                 clk_put(ac97_clk);
 388                 ac97_clk = NULL;
 389         }
 390 #ifdef CONFIG_PXA27x
 391         if (ac97conf_clk) {
 392                 clk_put(ac97conf_clk);
 393                 ac97conf_clk = NULL;
 394         }
 395 #endif
 396         return ret;
 397 }
 398
 399 static int __devexit pxa2xx_ac97_remove(struct platform_device *dev)
 400 {
 401         struct snd_card *card = platform_get_drvdata(dev);
 402
 403         if (card) {
 404                 snd_card_free(card);
 405                 platform_set_drvdata(dev, NULL);
 406                 GCR |= GCR_ACLINK_OFF;
 407                 free_irq(IRQ_AC97, NULL);
 408                 clk_disable(ac97_clk);
 409                 clk_put(ac97_clk);
 410                 ac97_clk = NULL;
 411 #ifdef CONFIG_PXA27x
 412                 clk_put(ac97conf_clk);
 413                 ac97conf_clk = NULL;
 414 #endif
 415         }
 416
 417         return 0;
 418 }
 419
 420 static struct platform_driver pxa2xx_ac97_driver = {
 421         .probe          = pxa2xx_ac97_probe,
 422         .remove         = __devexit_p(pxa2xx_ac97_remove),
 423         .suspend        = pxa2xx_ac97_suspend,
 424         .resume         = pxa2xx_ac97_resume,
 425         .driver         = {
 426                 .name   = "pxa2xx-ac97",
 427         },
 428 };
 429
 430 static int __init pxa2xx_ac97_init(void)
 431 {
 432         return platform_driver_register(&pxa2xx_ac97_driver);
 433 }
 434
 435 static void __exit pxa2xx_ac97_exit(void)
 436 {
 437         platform_driver_unregister(&pxa2xx_ac97_driver);
 438 }
 439
 440 module_init(pxa2xx_ac97_init);
 441 module_exit(pxa2xx_ac97_exit);
 442
 443 MODULE_AUTHOR("Nicolas Pitre");
 444 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
 445 MODULE_LICENSE("GPL");