sound/soc/pxa/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/platform_device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/wait.h>
  18 #include <linux/delay.h>
  19
  20 #include <sound/driver.h>
  21 #include <sound/core.h>
  22 #include <sound/pcm.h>
  23 #include <sound/ac97_codec.h>
  24 #include <sound/initval.h>
  25 #include <sound/soc.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 #include "pxa2xx-ac97.h"
  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,
  51         unsigned short reg)
  52 {
  53         unsigned short val = -1;
  54         volatile u32 *reg_addr;
  55
  56         mutex_lock(&car_mutex);
  57
  58         /* set up primary or secondary codec/modem space */
  59 #ifdef CONFIG_PXA27x
  60         reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
  61 #else
  62         if (reg == AC97_GPIO_STATUS)
  63                 reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
  64         else
  65                 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
  66 #endif
  67         reg_addr += (reg >> 1);
  68
  69 #ifndef CONFIG_PXA27x
  70         if (reg == AC97_GPIO_STATUS) {
  71                 /* read from controller cache */
  72                 val = *reg_addr;
  73                 goto out;
  74         }
  75 #endif
  76
  77         /* start read access across the ac97 link */
  78         GSR = GSR_CDONE | GSR_SDONE;
  79         gsr_bits = 0;
  80         val = *reg_addr;
  81
  82         wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
  83         if (!((GSR | gsr_bits) & GSR_SDONE)) {
  84                 printk(KERN_ERR "%s: read error (ac97_reg=%x GSR=%#lx)\n",
  85                                 __FUNCTION__, reg, GSR | gsr_bits);
  86                 val = -1;
  87                 goto out;
  88         }
  89
  90         /* valid data now */
  91         GSR = GSR_CDONE | GSR_SDONE;
  92         gsr_bits = 0;
  93         val = *reg_addr;
  94         /* but we've just started another cycle... */
  95         wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
  96
  97 out:    mutex_unlock(&car_mutex);
  98         return val;
  99 }
 100
 101 static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 102         unsigned short val)
 103 {
 104         volatile u32 *reg_addr;
 105
 106         mutex_lock(&car_mutex);
 107
 108         /* set up primary or secondary codec/modem space */
 109 #ifdef CONFIG_PXA27x
 110         reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
 111 #else
 112         if (reg == AC97_GPIO_STATUS)
 113                 reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
 114         else
 115                 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
 116 #endif
 117         reg_addr += (reg >> 1);
 118
 119         GSR = GSR_CDONE | GSR_SDONE;
 120         gsr_bits = 0;
 121         *reg_addr = val;
 122         wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1);
 123         if (!((GSR | gsr_bits) & GSR_CDONE))
 124                 printk(KERN_ERR "%s: write error (ac97_reg=%x GSR=%#lx)\n",
 125                                 __FUNCTION__, reg, GSR | gsr_bits);
 126
 127         mutex_unlock(&car_mutex);
 128 }
 129
 130 static void pxa2xx_ac97_warm_reset(struct snd_ac97 *ac97)
 131 {
 132         gsr_bits = 0;
 133
 134 #ifdef CONFIG_PXA27x
 135         /* warm reset broken on Bulverde,
 136            so manually keep AC97 reset high */
 137         pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH);
 138         udelay(10);
 139         GCR |= GCR_WARM_RST;
 140         pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 141         udelay(500);
 142 #else
 143         GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN;
 144         wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 145 #endif
 146
 147         if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
 148                 printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
 149                                  __FUNCTION__, gsr_bits);
 150
 151         GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
 152         GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
 153 }
 154
 155 static void pxa2xx_ac97_cold_reset(struct snd_ac97 *ac97)
 156 {
 157         GCR &=  GCR_COLD_RST;  /* clear everything but nCRST */
 158         GCR &= ~GCR_COLD_RST;  /* then assert nCRST */
 159
 160         gsr_bits = 0;
 161 #ifdef CONFIG_PXA27x
 162         /* PXA27x Developers Manual section 13.5.2.2.1 */
 163         pxa_set_cken(31, 1);
 164         udelay(5);
 165         pxa_set_cken(31, 0);
 166         GCR = GCR_COLD_RST;
 167         udelay(50);
 168 #else
 169         GCR = GCR_COLD_RST;
 170         GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
 171         wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 172 #endif
 173
 174         if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
 175                 printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
 176                                  __FUNCTION__, gsr_bits);
 177
 178         GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
 179         GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
 180 }
 181
 182 static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
 183 {
 184         long status;
 185
 186         status = GSR;
 187         if (status) {
 188                 GSR = status;
 189                 gsr_bits |= status;
 190                 wake_up(&gsr_wq);
 191
 192 #ifdef CONFIG_PXA27x
 193                 /* Although we don't use those we still need to clear them
 194                    since they tend to spuriously trigger when MMC is used
 195                    (hardware bug? go figure)... */
 196                 MISR = MISR_EOC;
 197                 PISR = PISR_EOC;
 198                 MCSR = MCSR_EOC;
 199 #endif
 200
 201                 return IRQ_HANDLED;
 202         }
 203
 204         return IRQ_NONE;
 205 }
 206
 207 struct snd_ac97_bus_ops soc_ac97_ops = {
 208         .read   = pxa2xx_ac97_read,
 209         .write  = pxa2xx_ac97_write,
 210         .warm_reset     = pxa2xx_ac97_warm_reset,
 211         .reset  = pxa2xx_ac97_cold_reset,
 212 };
 213
 214 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_out = {
 215         .name                   = "AC97 PCM Stereo out",
 216         .dev_addr               = __PREG(PCDR),
 217         .drcmr                  = &DRCMRTXPCDR,
 218         .dcmd                   = DCMD_INCSRCADDR | DCMD_FLOWTRG |
 219                                   DCMD_BURST32 | DCMD_WIDTH4,
 220 };
 221
 222 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_in = {
 223         .name                   = "AC97 PCM Stereo in",
 224         .dev_addr               = __PREG(PCDR),
 225         .drcmr                  = &DRCMRRXPCDR,
 226         .dcmd                   = DCMD_INCTRGADDR | DCMD_FLOWSRC |
 227                                   DCMD_BURST32 | DCMD_WIDTH4,
 228 };
 229
 230 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_out = {
 231         .name                   = "AC97 Aux PCM (Slot 5) Mono out",
 232         .dev_addr               = __PREG(MODR),
 233         .drcmr                  = &DRCMRTXMODR,
 234         .dcmd                   = DCMD_INCSRCADDR | DCMD_FLOWTRG |
 235                                   DCMD_BURST16 | DCMD_WIDTH2,
 236 };
 237
 238 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_in = {
 239         .name                   = "AC97 Aux PCM (Slot 5) Mono in",
 240         .dev_addr               = __PREG(MODR),
 241         .drcmr                  = &DRCMRRXMODR,
 242         .dcmd                   = DCMD_INCTRGADDR | DCMD_FLOWSRC |
 243                                   DCMD_BURST16 | DCMD_WIDTH2,
 244 };
 245
 246 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_mic_mono_in = {
 247         .name                   = "AC97 Mic PCM (Slot 6) Mono in",
 248         .dev_addr               = __PREG(MCDR),
 249         .drcmr                  = &DRCMRRXMCDR,
 250         .dcmd                   = DCMD_INCTRGADDR | DCMD_FLOWSRC |
 251                                   DCMD_BURST16 | DCMD_WIDTH2,
 252 };
 253
 254 #ifdef CONFIG_PM
 255 static int pxa2xx_ac97_suspend(struct platform_device *pdev,
 256         struct snd_soc_cpu_dai *dai)
 257 {
 258         GCR |= GCR_ACLINK_OFF;
 259         pxa_set_cken(CKEN_AC97, 0);
 260         return 0;
 261 }
 262
 263 static int pxa2xx_ac97_resume(struct platform_device *pdev,
 264         struct snd_soc_cpu_dai *dai)
 265 {
 266         pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
 267         pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
 268         pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
 269         pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
 270 #ifdef CONFIG_PXA27x
 271         /* Use GPIO 113 as AC97 Reset on Bulverde */
 272         pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 273 #endif
 274         pxa_set_cken(CKEN_AC97, 1);
 275         return 0;
 276 }
 277
 278 #else
 279 #define pxa2xx_ac97_suspend     NULL
 280 #define pxa2xx_ac97_resume      NULL
 281 #endif
 282
 283 static int pxa2xx_ac97_probe(struct platform_device *pdev)
 284 {
 285         int ret;
 286
 287         ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL);
 288         if (ret < 0)
 289                 goto err;
 290
 291         pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
 292         pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
 293         pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
 294         pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
 295 #ifdef CONFIG_PXA27x
 296         /* Use GPIO 113 as AC97 Reset on Bulverde */
 297         pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 298 #endif
 299         pxa_set_cken(CKEN_AC97, 1);
 300         return 0;
 301
 302  err:
 303         if (CKEN & (1 << CKEN_AC97)) {
 304                 GCR |= GCR_ACLINK_OFF;
 305                 free_irq(IRQ_AC97, NULL);
 306                 pxa_set_cken(CKEN_AC97, 0);
 307         }
 308         return ret;
 309 }
 310
 311 static void pxa2xx_ac97_remove(struct platform_device *pdev)
 312 {
 313         GCR |= GCR_ACLINK_OFF;
 314         free_irq(IRQ_AC97, NULL);
 315         pxa_set_cken(CKEN_AC97, 0);
 316 }
 317
 318 static int pxa2xx_ac97_hw_params(struct snd_pcm_substream *substream,
 319                                 struct snd_pcm_hw_params *params)
 320 {
 321         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 322         struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
 323
 324         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 325                 cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_out;
 326         else
 327                 cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_in;
 328
 329         return 0;
 330 }
 331
 332 static int pxa2xx_ac97_hw_aux_params(struct snd_pcm_substream *substream,
 333         struct snd_pcm_hw_params *params)
 334 {
 335         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 336         struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
 337
 338         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 339                 cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_out;
 340         else
 341                 cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_in;
 342
 343         return 0;
 344 }
 345
 346 static int pxa2xx_ac97_hw_mic_params(struct snd_pcm_substream *substream,
 347         struct snd_pcm_hw_params *params)
 348 {
 349         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 350         struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
 351
 352         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 353                 return -ENODEV;
 354         else
 355                 cpu_dai->dma_data = &pxa2xx_ac97_pcm_mic_mono_in;
 356
 357         return 0;
 358 }
 359
 360 #define PXA2XX_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 361                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
 362                 SNDRV_PCM_RATE_48000)
 363
 364 /*
 365  * There is only 1 physical AC97 interface for pxa2xx, but it
 366  * has extra fifo's that can be used for aux DACs and ADCs.
 367  */
 368 struct snd_soc_cpu_dai pxa_ac97_dai[] = {
 369 {
 370         .name = "pxa2xx-ac97",
 371         .id = 0,
 372         .type = SND_SOC_DAI_AC97,
 373         .probe = pxa2xx_ac97_probe,
 374         .remove = pxa2xx_ac97_remove,
 375         .suspend = pxa2xx_ac97_suspend,
 376         .resume = pxa2xx_ac97_resume,
 377         .playback = {
 378                 .stream_name = "AC97 Playback",
 379                 .channels_min = 2,
 380                 .channels_max = 2,
 381                 .rates = PXA2XX_AC97_RATES,
 382                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 383         .capture = {
 384                 .stream_name = "AC97 Capture",
 385                 .channels_min = 2,
 386                 .channels_max = 2,
 387                 .rates = PXA2XX_AC97_RATES,
 388                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 389         .ops = {
 390                 .hw_params = pxa2xx_ac97_hw_params,},
 391 },
 392 {
 393         .name = "pxa2xx-ac97-aux",
 394         .id = 1,
 395         .type = SND_SOC_DAI_AC97,
 396         .playback = {
 397                 .stream_name = "AC97 Aux Playback",
 398                 .channels_min = 1,
 399                 .channels_max = 1,
 400                 .rates = PXA2XX_AC97_RATES,
 401                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 402         .capture = {
 403                 .stream_name = "AC97 Aux Capture",
 404                 .channels_min = 1,
 405                 .channels_max = 1,
 406                 .rates = PXA2XX_AC97_RATES,
 407                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 408         .ops = {
 409                 .hw_params = pxa2xx_ac97_hw_aux_params,},
 410 },
 411 {
 412         .name = "pxa2xx-ac97-mic",
 413         .id = 2,
 414         .type = SND_SOC_DAI_AC97,
 415         .capture = {
 416                 .stream_name = "AC97 Mic Capture",
 417                 .channels_min = 1,
 418                 .channels_max = 1,
 419                 .rates = PXA2XX_AC97_RATES,
 420                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 421         .ops = {
 422                 .hw_params = pxa2xx_ac97_hw_mic_params,},
 423 },
 424 };
 425
 426 EXPORT_SYMBOL_GPL(pxa_ac97_dai);
 427 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 428
 429 MODULE_AUTHOR("Nicolas Pitre");
 430 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
 431 MODULE_LICENSE("GPL");