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/clk.h>
  19 #include <linux/delay.h>
  20
  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/pxa2xx-gpio.h>
  32 #include <asm/arch/audio.h>
  33
  34 #include "pxa2xx-pcm.h"
  35 #include "pxa2xx-ac97.h"
  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,
  56         unsigned short reg)
  57 {
  58         unsigned short val = -1;
  59         volatile u32 *reg_addr;
  60
  61         mutex_lock(&car_mutex);
  62
  63         /* set up primary or secondary codec/modem space */
  64 #if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
  65         reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
  66 #else
  67         if (reg == AC97_GPIO_STATUS)
  68                 reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
  69         else
  70                 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
  71 #endif
  72         reg_addr += (reg >> 1);
  73
  74 #ifndef CONFIG_PXA27x
  75         if (reg == AC97_GPIO_STATUS) {
  76                 /* read from controller cache */
  77                 val = *reg_addr;
  78                 goto out;
  79         }
  80 #endif
  81
  82         /* start read access across the ac97 link */
  83         GSR = GSR_CDONE | GSR_SDONE;
  84         gsr_bits = 0;
  85         val = *reg_addr;
  86
  87         wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
  88         if (!((GSR | gsr_bits) & GSR_SDONE)) {
  89                 printk(KERN_ERR "%s: read error (ac97_reg=%x GSR=%#lx)\n",
  90                                 __func__, reg, GSR | gsr_bits);
  91                 val = -1;
  92                 goto out;
  93         }
  94
  95         /* valid data now */
  96         GSR = GSR_CDONE | GSR_SDONE;
  97         gsr_bits = 0;
  98         val = *reg_addr;
  99         /* but we've just started another cycle... */
 100         wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
 101
 102 out:    mutex_unlock(&car_mutex);
 103         return val;
 104 }
 105
 106 static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 107         unsigned short val)
 108 {
 109         volatile u32 *reg_addr;
 110
 111         mutex_lock(&car_mutex);
 112
 113         /* set up primary or secondary codec/modem space */
 114 #if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
 115         reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
 116 #else
 117         if (reg == AC97_GPIO_STATUS)
 118                 reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
 119         else
 120                 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
 121 #endif
 122         reg_addr += (reg >> 1);
 123
 124         GSR = GSR_CDONE | GSR_SDONE;
 125         gsr_bits = 0;
 126         *reg_addr = val;
 127         wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1);
 128         if (!((GSR | gsr_bits) & GSR_CDONE))
 129                 printk(KERN_ERR "%s: write error (ac97_reg=%x GSR=%#lx)\n",
 130                                 __func__, reg, GSR | gsr_bits);
 131
 132         mutex_unlock(&car_mutex);
 133 }
 134
 135 static void pxa2xx_ac97_warm_reset(struct snd_ac97 *ac97)
 136 {
 137 #ifdef CONFIG_PXA3xx
 138         int timeout = 100;
 139 #endif
 140         gsr_bits = 0;
 141
 142 #ifdef CONFIG_PXA27x
 143         /* warm reset broken on Bulverde,
 144            so manually keep AC97 reset high */
 145         pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH);
 146         udelay(10);
 147         GCR |= GCR_WARM_RST;
 148         pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 149         udelay(500);
 150 #elif defined(CONFIG_PXA3xx)
 151         /* Can't use interrupts */
 152         GCR |= GCR_WARM_RST;
 153         while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
 154                 mdelay(1);
 155 #else
 156         GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN;
 157         wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 158 #endif
 159
 160         if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
 161                 printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
 162                                  __func__, gsr_bits);
 163
 164         GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
 165         GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
 166 }
 167
 168 static void pxa2xx_ac97_cold_reset(struct snd_ac97 *ac97)
 169 {
 170 #ifdef CONFIG_PXA3xx
 171         int timeout = 1000;
 172
 173         /* Hold CLKBPB for 100us */
 174         GCR = 0;
 175         GCR = GCR_CLKBPB;
 176         udelay(100);
 177         GCR = 0;
 178 #endif
 179
 180         GCR &=  GCR_COLD_RST;  /* clear everything but nCRST */
 181         GCR &= ~GCR_COLD_RST;  /* then assert nCRST */
 182
 183         gsr_bits = 0;
 184 #ifdef CONFIG_PXA27x
 185         /* PXA27x Developers Manual section 13.5.2.2.1 */
 186         clk_enable(ac97conf_clk);
 187         udelay(5);
 188         clk_disable(ac97conf_clk);
 189         GCR = GCR_COLD_RST;
 190         udelay(50);
 191 #elif defined(CONFIG_PXA3xx)
 192         /* Can't use interrupts on PXA3xx */
 193         GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
 194
 195         GCR = GCR_WARM_RST | GCR_COLD_RST;
 196         while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--)
 197                 mdelay(10);
 198 #else
 199         GCR = GCR_COLD_RST;
 200         GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
 201         wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 202 #endif
 203
 204         if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
 205                 printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
 206                                  __func__, gsr_bits);
 207
 208         GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
 209         GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
 210 }
 211
 212 static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
 213 {
 214         long status;
 215
 216         status = GSR;
 217         if (status) {
 218                 GSR = status;
 219                 gsr_bits |= status;
 220                 wake_up(&gsr_wq);
 221
 222 #ifdef CONFIG_PXA27x
 223                 /* Although we don't use those we still need to clear them
 224                    since they tend to spuriously trigger when MMC is used
 225                    (hardware bug? go figure)... */
 226                 MISR = MISR_EOC;
 227                 PISR = PISR_EOC;
 228                 MCSR = MCSR_EOC;
 229 #endif
 230
 231                 return IRQ_HANDLED;
 232         }
 233
 234         return IRQ_NONE;
 235 }
 236
 237 struct snd_ac97_bus_ops soc_ac97_ops = {
 238         .read   = pxa2xx_ac97_read,
 239         .write  = pxa2xx_ac97_write,
 240         .warm_reset     = pxa2xx_ac97_warm_reset,
 241         .reset  = pxa2xx_ac97_cold_reset,
 242 };
 243
 244 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_out = {
 245         .name                   = "AC97 PCM Stereo out",
 246         .dev_addr               = __PREG(PCDR),
 247         .drcmr                  = &DRCMRTXPCDR,
 248         .dcmd                   = DCMD_INCSRCADDR | DCMD_FLOWTRG |
 249                                   DCMD_BURST32 | DCMD_WIDTH4,
 250 };
 251
 252 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_in = {
 253         .name                   = "AC97 PCM Stereo in",
 254         .dev_addr               = __PREG(PCDR),
 255         .drcmr                  = &DRCMRRXPCDR,
 256         .dcmd                   = DCMD_INCTRGADDR | DCMD_FLOWSRC |
 257                                   DCMD_BURST32 | DCMD_WIDTH4,
 258 };
 259
 260 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_out = {
 261         .name                   = "AC97 Aux PCM (Slot 5) Mono out",
 262         .dev_addr               = __PREG(MODR),
 263         .drcmr                  = &DRCMRTXMODR,
 264         .dcmd                   = DCMD_INCSRCADDR | DCMD_FLOWTRG |
 265                                   DCMD_BURST16 | DCMD_WIDTH2,
 266 };
 267
 268 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_in = {
 269         .name                   = "AC97 Aux PCM (Slot 5) Mono in",
 270         .dev_addr               = __PREG(MODR),
 271         .drcmr                  = &DRCMRRXMODR,
 272         .dcmd                   = DCMD_INCTRGADDR | DCMD_FLOWSRC |
 273                                   DCMD_BURST16 | DCMD_WIDTH2,
 274 };
 275
 276 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_mic_mono_in = {
 277         .name                   = "AC97 Mic PCM (Slot 6) Mono in",
 278         .dev_addr               = __PREG(MCDR),
 279         .drcmr                  = &DRCMRRXMCDR,
 280         .dcmd                   = DCMD_INCTRGADDR | DCMD_FLOWSRC |
 281                                   DCMD_BURST16 | DCMD_WIDTH2,
 282 };
 283
 284 #ifdef CONFIG_PM
 285 static int pxa2xx_ac97_suspend(struct platform_device *pdev,
 286         struct snd_soc_cpu_dai *dai)
 287 {
 288         GCR |= GCR_ACLINK_OFF;
 289         clk_disable(ac97_clk);
 290         return 0;
 291 }
 292
 293 static int pxa2xx_ac97_resume(struct platform_device *pdev,
 294         struct snd_soc_cpu_dai *dai)
 295 {
 296         pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
 297         pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
 298         pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
 299         pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
 300 #ifdef CONFIG_PXA27x
 301         /* Use GPIO 113 as AC97 Reset on Bulverde */
 302         pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 303 #endif
 304         clk_enable(ac97_clk);
 305         return 0;
 306 }
 307
 308 #else
 309 #define pxa2xx_ac97_suspend     NULL
 310 #define pxa2xx_ac97_resume      NULL
 311 #endif
 312
 313 static int pxa2xx_ac97_probe(struct platform_device *pdev)
 314 {
 315         int ret;
 316
 317         ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL);
 318         if (ret < 0)
 319                 goto err;
 320
 321         pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
 322         pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
 323         pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
 324         pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
 325 #ifdef CONFIG_PXA27x
 326         /* Use GPIO 113 as AC97 Reset on Bulverde */
 327         pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 328
 329         ac97conf_clk = clk_get(&pdev->dev, "AC97CONFCLK");
 330         if (IS_ERR(ac97conf_clk)) {
 331                 ret = PTR_ERR(ac97conf_clk);
 332                 ac97conf_clk = NULL;
 333                 goto err_irq;
 334         }
 335 #endif
 336         ac97_clk = clk_get(&pdev->dev, "AC97CLK");
 337         if (IS_ERR(ac97_clk)) {
 338                 ret = PTR_ERR(ac97_clk);
 339                 ac97_clk = NULL;
 340                 goto err_irq;
 341         }
 342         clk_enable(ac97_clk);
 343         return 0;
 344
 345  err_irq:
 346         GCR |= GCR_ACLINK_OFF;
 347 #ifdef CONFIG_PXA27x
 348         if (ac97conf_clk) {
 349                 clk_put(ac97conf_clk);
 350                 ac97conf_clk = NULL;
 351         }
 352 #endif
 353         free_irq(IRQ_AC97, NULL);
 354  err:
 355         return ret;
 356 }
 357
 358 static void pxa2xx_ac97_remove(struct platform_device *pdev)
 359 {
 360         GCR |= GCR_ACLINK_OFF;
 361         free_irq(IRQ_AC97, NULL);
 362 #ifdef CONFIG_PXA27x
 363         clk_put(ac97conf_clk);
 364         ac97conf_clk = NULL;
 365 #endif
 366         clk_disable(ac97_clk);
 367         clk_put(ac97_clk);
 368         ac97_clk = NULL;
 369 }
 370
 371 static int pxa2xx_ac97_hw_params(struct snd_pcm_substream *substream,
 372                                 struct snd_pcm_hw_params *params)
 373 {
 374         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 375         struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
 376
 377         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 378                 cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_out;
 379         else
 380                 cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_in;
 381
 382         return 0;
 383 }
 384
 385 static int pxa2xx_ac97_hw_aux_params(struct snd_pcm_substream *substream,
 386         struct snd_pcm_hw_params *params)
 387 {
 388         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 389         struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
 390
 391         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 392                 cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_out;
 393         else
 394                 cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_in;
 395
 396         return 0;
 397 }
 398
 399 static int pxa2xx_ac97_hw_mic_params(struct snd_pcm_substream *substream,
 400         struct snd_pcm_hw_params *params)
 401 {
 402         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 403         struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
 404
 405         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 406                 return -ENODEV;
 407         else
 408                 cpu_dai->dma_data = &pxa2xx_ac97_pcm_mic_mono_in;
 409
 410         return 0;
 411 }
 412
 413 #define PXA2XX_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 414                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
 415                 SNDRV_PCM_RATE_48000)
 416
 417 /*
 418  * There is only 1 physical AC97 interface for pxa2xx, but it
 419  * has extra fifo's that can be used for aux DACs and ADCs.
 420  */
 421 struct snd_soc_cpu_dai pxa_ac97_dai[] = {
 422 {
 423         .name = "pxa2xx-ac97",
 424         .id = 0,
 425         .type = SND_SOC_DAI_AC97,
 426         .probe = pxa2xx_ac97_probe,
 427         .remove = pxa2xx_ac97_remove,
 428         .suspend = pxa2xx_ac97_suspend,
 429         .resume = pxa2xx_ac97_resume,
 430         .playback = {
 431                 .stream_name = "AC97 Playback",
 432                 .channels_min = 2,
 433                 .channels_max = 2,
 434                 .rates = PXA2XX_AC97_RATES,
 435                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 436         .capture = {
 437                 .stream_name = "AC97 Capture",
 438                 .channels_min = 2,
 439                 .channels_max = 2,
 440                 .rates = PXA2XX_AC97_RATES,
 441                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 442         .ops = {
 443                 .hw_params = pxa2xx_ac97_hw_params,},
 444 },
 445 {
 446         .name = "pxa2xx-ac97-aux",
 447         .id = 1,
 448         .type = SND_SOC_DAI_AC97,
 449         .playback = {
 450                 .stream_name = "AC97 Aux Playback",
 451                 .channels_min = 1,
 452                 .channels_max = 1,
 453                 .rates = PXA2XX_AC97_RATES,
 454                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 455         .capture = {
 456                 .stream_name = "AC97 Aux Capture",
 457                 .channels_min = 1,
 458                 .channels_max = 1,
 459                 .rates = PXA2XX_AC97_RATES,
 460                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 461         .ops = {
 462                 .hw_params = pxa2xx_ac97_hw_aux_params,},
 463 },
 464 {
 465         .name = "pxa2xx-ac97-mic",
 466         .id = 2,
 467         .type = SND_SOC_DAI_AC97,
 468         .capture = {
 469                 .stream_name = "AC97 Mic Capture",
 470                 .channels_min = 1,
 471                 .channels_max = 1,
 472                 .rates = PXA2XX_AC97_RATES,
 473                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 474         .ops = {
 475                 .hw_params = pxa2xx_ac97_hw_mic_params,},
 476 },
 477 };
 478
 479 EXPORT_SYMBOL_GPL(pxa_ac97_dai);
 480 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 481
 482 MODULE_AUTHOR("Nicolas Pitre");
 483 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
 484 MODULE_LICENSE("GPL");