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/delay.h>
  20
  21 #include <sound/driver.h>
  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/audio.h>
  32
  33 #include "pxa2xx-pcm.h"
  34
  35
  36 static DEFINE_MUTEX(car_mutex);
  37 static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
  38 static volatile long gsr_bits;
  39
  40 /*
  41  * Beware PXA27x bugs:
  42  *
  43  *   o Slot 12 read from modem space will hang controller.
  44  *   o CDONE, SDONE interrupt fails after any slot 12 IO.
  45  *
  46  * We therefore have an hybrid approach for waiting on SDONE (interrupt or
  47  * 1 jiffy timeout if interrupt never comes).
  48  */
  49
  50 static unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
  51 {
  52         unsigned short val = -1;
  53         volatile u32 *reg_addr;
  54
  55         mutex_lock(&car_mutex);
  56
  57         /* set up primary or secondary codec space */
  58         reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
  59         reg_addr += (reg >> 1);
  60
  61         /* start read access across the ac97 link */
  62         GSR = GSR_CDONE | GSR_SDONE;
  63         gsr_bits = 0;
  64         val = *reg_addr;
  65         if (reg == AC97_GPIO_STATUS)
  66                 goto out;
  67         if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1) <= 0 &&
  68             !((GSR | gsr_bits) & GSR_SDONE)) {
  69                 printk(KERN_ERR "%s: read error (ac97_reg=%d GSR=%#lx)\n",
  70                                 __FUNCTION__, reg, GSR | gsr_bits);
  71                 val = -1;
  72                 goto out;
  73         }
  74
  75         /* valid data now */
  76         GSR = GSR_CDONE | GSR_SDONE;
  77         gsr_bits = 0;
  78         val = *reg_addr;
  79         /* but we've just started another cycle... */
  80         wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
  81
  82 out:    mutex_unlock(&car_mutex);
  83         return val;
  84 }
  85
  86 static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
  87 {
  88         volatile u32 *reg_addr;
  89
  90         mutex_lock(&car_mutex);
  91
  92         /* set up primary or secondary codec space */
  93         reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
  94         reg_addr += (reg >> 1);
  95
  96         GSR = GSR_CDONE | GSR_SDONE;
  97         gsr_bits = 0;
  98         *reg_addr = val;
  99         if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1) <= 0 &&
 100             !((GSR | gsr_bits) & GSR_CDONE))
 101                 printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n",
 102                                 __FUNCTION__, reg, GSR | gsr_bits);
 103
 104         mutex_unlock(&car_mutex);
 105 }
 106
 107 static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)
 108 {
 109         /* First, try cold reset */
 110         GCR &=  GCR_COLD_RST;  /* clear everything but nCRST */
 111         GCR &= ~GCR_COLD_RST;  /* then assert nCRST */
 112
 113         gsr_bits = 0;
 114 #ifdef CONFIG_PXA27x
 115         /* PXA27x Developers Manual section 13.5.2.2.1 */
 116         pxa_set_cken(1 << 31, 1);
 117         udelay(5);
 118         pxa_set_cken(1 << 31, 0);
 119         GCR = GCR_COLD_RST;
 120         udelay(50);
 121 #else
 122         GCR = GCR_COLD_RST;
 123         GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
 124         wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 125 #endif
 126
 127         if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
 128                 printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
 129                                  __FUNCTION__, gsr_bits);
 130
 131                 /* let's try warm reset */
 132                 gsr_bits = 0;
 133 #ifdef CONFIG_PXA27x
 134                 /* warm reset broken on Bulverde,
 135                    so manually keep AC97 reset high */
 136                 pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH);
 137                 udelay(10);
 138                 GCR |= GCR_WARM_RST;
 139                 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 140                 udelay(500);
 141 #else
 142                 GCR |= GCR_WARM_RST|GCR_PRIRDY_IEN|GCR_SECRDY_IEN;
 143                 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 144 #endif
 145
 146                 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
 147                         printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
 148                                          __FUNCTION__, gsr_bits);
 149         }
 150
 151         GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
 152         GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
 153 }
 154
 155 static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id, struct pt_regs *regs)
 156 {
 157         long status;
 158
 159         status = GSR;
 160         if (status) {
 161                 GSR = status;
 162                 gsr_bits |= status;
 163                 wake_up(&gsr_wq);
 164
 165 #ifdef CONFIG_PXA27x
 166                 /* Although we don't use those we still need to clear them
 167                    since they tend to spuriously trigger when MMC is used
 168                    (hardware bug? go figure)... */
 169                 MISR = MISR_EOC;
 170                 PISR = PISR_EOC;
 171                 MCSR = MCSR_EOC;
 172 #endif
 173
 174                 return IRQ_HANDLED;
 175         }
 176
 177         return IRQ_NONE;
 178 }
 179
 180 static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
 181         .read   = pxa2xx_ac97_read,
 182         .write  = pxa2xx_ac97_write,
 183         .reset  = pxa2xx_ac97_reset,
 184 };
 185
 186 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_out = {
 187         .name                   = "AC97 PCM out",
 188         .dev_addr               = __PREG(PCDR),
 189         .drcmr                  = &DRCMRTXPCDR,
 190         .dcmd                   = DCMD_INCSRCADDR | DCMD_FLOWTRG |
 191                                   DCMD_BURST32 | DCMD_WIDTH4,
 192 };
 193
 194 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_in = {
 195         .name                   = "AC97 PCM in",
 196         .dev_addr               = __PREG(PCDR),
 197         .drcmr                  = &DRCMRRXPCDR,
 198         .dcmd                   = DCMD_INCTRGADDR | DCMD_FLOWSRC |
 199                                   DCMD_BURST32 | DCMD_WIDTH4,
 200 };
 201
 202 static struct snd_pcm *pxa2xx_ac97_pcm;
 203 static struct snd_ac97 *pxa2xx_ac97_ac97;
 204
 205 static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream)
 206 {
 207         struct snd_pcm_runtime *runtime = substream->runtime;
 208         pxa2xx_audio_ops_t *platform_ops;
 209         int r;
 210
 211         runtime->hw.channels_min = 2;
 212         runtime->hw.channels_max = 2;
 213
 214         r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 215             AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
 216         runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
 217         snd_pcm_limit_hw_rates(runtime);
 218
 219         platform_ops = substream->pcm->card->dev->platform_data;
 220         if (platform_ops && platform_ops->startup)
 221                 return platform_ops->startup(substream, platform_ops->priv);
 222         else
 223                 return 0;
 224 }
 225
 226 static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream)
 227 {
 228         pxa2xx_audio_ops_t *platform_ops;
 229
 230         platform_ops = substream->pcm->card->dev->platform_data;
 231         if (platform_ops && platform_ops->shutdown)
 232                 platform_ops->shutdown(substream, platform_ops->priv);
 233 }
 234
 235 static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
 236 {
 237         struct snd_pcm_runtime *runtime = substream->runtime;
 238         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 239                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
 240         return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
 241 }
 242
 243 static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
 244         .playback_params        = &pxa2xx_ac97_pcm_out,
 245         .capture_params         = &pxa2xx_ac97_pcm_in,
 246         .startup                = pxa2xx_ac97_pcm_startup,
 247         .shutdown               = pxa2xx_ac97_pcm_shutdown,
 248         .prepare                = pxa2xx_ac97_pcm_prepare,
 249 };
 250
 251 #ifdef CONFIG_PM
 252
 253 static int pxa2xx_ac97_do_suspend(struct snd_card *card, pm_message_t state)
 254 {
 255         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 256
 257         snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
 258         snd_pcm_suspend_all(pxa2xx_ac97_pcm);
 259         snd_ac97_suspend(pxa2xx_ac97_ac97);
 260         if (platform_ops && platform_ops->suspend)
 261                 platform_ops->suspend(platform_ops->priv);
 262         GCR |= GCR_ACLINK_OFF;
 263         pxa_set_cken(CKEN2_AC97, 0);
 264
 265         return 0;
 266 }
 267
 268 static int pxa2xx_ac97_do_resume(struct snd_card *card)
 269 {
 270         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 271
 272         pxa_set_cken(CKEN2_AC97, 1);
 273         if (platform_ops && platform_ops->resume)
 274                 platform_ops->resume(platform_ops->priv);
 275         snd_ac97_resume(pxa2xx_ac97_ac97);
 276         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 277
 278         return 0;
 279 }
 280
 281 static int pxa2xx_ac97_suspend(struct platform_device *dev, pm_message_t state)
 282 {
 283         struct snd_card *card = platform_get_drvdata(dev);
 284         int ret = 0;
 285
 286         if (card)
 287                 ret = pxa2xx_ac97_do_suspend(card, PMSG_SUSPEND);
 288
 289         return ret;
 290 }
 291
 292 static int pxa2xx_ac97_resume(struct platform_device *dev)
 293 {
 294         struct snd_card *card = platform_get_drvdata(dev);
 295         int ret = 0;
 296
 297         if (card)
 298                 ret = pxa2xx_ac97_do_resume(card);
 299
 300         return ret;
 301 }
 302
 303 #else
 304 #define pxa2xx_ac97_suspend     NULL
 305 #define pxa2xx_ac97_resume      NULL
 306 #endif
 307
 308 static int pxa2xx_ac97_probe(struct platform_device *dev)
 309 {
 310         struct snd_card *card;
 311         struct snd_ac97_bus *ac97_bus;
 312         struct snd_ac97_template ac97_template;
 313         int ret;
 314
 315         ret = -ENOMEM;
 316         card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 317                             THIS_MODULE, 0);
 318         if (!card)
 319                 goto err;
 320
 321         card->dev = &dev->dev;
 322         strncpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
 323
 324         ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
 325         if (ret)
 326                 goto err;
 327
 328         ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, 0, "AC97", NULL);
 329         if (ret < 0)
 330                 goto err;
 331
 332         pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
 333         pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
 334         pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
 335         pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
 336 #ifdef CONFIG_PXA27x
 337         /* Use GPIO 113 as AC97 Reset on Bulverde */
 338         pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 339 #endif
 340         pxa_set_cken(CKEN2_AC97, 1);
 341
 342         ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
 343         if (ret)
 344                 goto err;
 345         memset(&ac97_template, 0, sizeof(ac97_template));
 346         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
 347         if (ret)
 348                 goto err;
 349
 350         snprintf(card->shortname, sizeof(card->shortname),
 351                  "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
 352         snprintf(card->longname, sizeof(card->longname),
 353                  "%s (%s)", dev->dev.driver->name, card->mixername);
 354
 355         ret = snd_card_register(card);
 356         if (ret == 0) {
 357                 platform_set_drvdata(dev, card);
 358                 return 0;
 359         }
 360
 361  err:
 362         if (card)
 363                 snd_card_free(card);
 364         if (CKEN & CKEN2_AC97) {
 365                 GCR |= GCR_ACLINK_OFF;
 366                 free_irq(IRQ_AC97, NULL);
 367                 pxa_set_cken(CKEN2_AC97, 0);
 368         }
 369         return ret;
 370 }
 371
 372 static int pxa2xx_ac97_remove(struct platform_device *dev)
 373 {
 374         struct snd_card *card = platform_get_drvdata(dev);
 375
 376         if (card) {
 377                 snd_card_free(card);
 378                 platform_set_drvdata(dev, NULL);
 379                 GCR |= GCR_ACLINK_OFF;
 380                 free_irq(IRQ_AC97, NULL);
 381                 pxa_set_cken(CKEN2_AC97, 0);
 382         }
 383
 384         return 0;
 385 }
 386
 387 static struct platform_driver pxa2xx_ac97_driver = {
 388         .probe          = pxa2xx_ac97_probe,
 389         .remove         = pxa2xx_ac97_remove,
 390         .suspend        = pxa2xx_ac97_suspend,
 391         .resume         = pxa2xx_ac97_resume,
 392         .driver         = {
 393                 .name   = "pxa2xx-ac97",
 394         },
 395 };
 396
 397 static int __init pxa2xx_ac97_init(void)
 398 {
 399         return platform_driver_register(&pxa2xx_ac97_driver);
 400 }
 401
 402 static void __exit pxa2xx_ac97_exit(void)
 403 {
 404         platform_driver_unregister(&pxa2xx_ac97_driver);
 405 }
 406
 407 module_init(pxa2xx_ac97_init);
 408 module_exit(pxa2xx_ac97_exit);
 409
 410 MODULE_AUTHOR("Nicolas Pitre");
 411 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
 412 MODULE_LICENSE("GPL");