sound/soc/txx9/txx9aclc-ac97.c

   1 /*
   2  * TXx9 ACLC AC97 driver
   3  *
   4  * Copyright (C) 2009 Atsushi Nemoto
   5  *
   6  * Based on RBTX49xx patch from CELF patch archive.
   7  * (C) Copyright TOSHIBA CORPORATION 2004-2006
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16 #include <linux/delay.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/io.h>
  19 #include <linux/gfp.h>
  20 #include <sound/core.h>
  21 #include <sound/pcm.h>
  22 #include <sound/soc.h>
  23 #include "txx9aclc.h"
  24
  25 #define AC97_DIR        \
  26         (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
  27
  28 #define AC97_RATES      \
  29         SNDRV_PCM_RATE_8000_48000
  30
  31 #ifdef __BIG_ENDIAN
  32 #define AC97_FMTS       SNDRV_PCM_FMTBIT_S16_BE
  33 #else
  34 #define AC97_FMTS       SNDRV_PCM_FMTBIT_S16_LE
  35 #endif
  36
  37 static DECLARE_WAIT_QUEUE_HEAD(ac97_waitq);
  38
  39 /* REVISIT: How to find txx9aclc_soc_device from snd_ac97? */
  40 static struct txx9aclc_soc_device *txx9aclc_soc_dev;
  41
  42 static int txx9aclc_regready(struct txx9aclc_soc_device *dev)
  43 {
  44         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
  45
  46         return __raw_readl(drvdata->base + ACINTSTS) & ACINT_REGACCRDY;
  47 }
  48
  49 /* AC97 controller reads codec register */
  50 static unsigned short txx9aclc_ac97_read(struct snd_ac97 *ac97,
  51                                          unsigned short reg)
  52 {
  53         struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
  54         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
  55         void __iomem *base = drvdata->base;
  56         u32 dat;
  57
  58         if (!(__raw_readl(base + ACINTSTS) & ACINT_CODECRDY(ac97->num)))
  59                 return 0xffff;
  60         reg |= ac97->num << 7;
  61         dat = (reg << ACREGACC_REG_SHIFT) | ACREGACC_READ;
  62         __raw_writel(dat, base + ACREGACC);
  63         __raw_writel(ACINT_REGACCRDY, base + ACINTEN);
  64         if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(dev), HZ)) {
  65                 __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
  66                 dev_err(dev->soc_dev.dev, "ac97 read timeout (reg %#x)\n", reg);
  67                 dat = 0xffff;
  68                 goto done;
  69         }
  70         dat = __raw_readl(base + ACREGACC);
  71         if (((dat >> ACREGACC_REG_SHIFT) & 0xff) != reg) {
  72                 dev_err(dev->soc_dev.dev, "reg mismatch %x with %x\n",
  73                         dat, reg);
  74                 dat = 0xffff;
  75                 goto done;
  76         }
  77         dat = (dat >> ACREGACC_DAT_SHIFT) & 0xffff;
  78 done:
  79         __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
  80         return dat;
  81 }
  82
  83 /* AC97 controller writes to codec register */
  84 static void txx9aclc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
  85                                 unsigned short val)
  86 {
  87         struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
  88         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
  89         void __iomem *base = drvdata->base;
  90
  91         __raw_writel(((reg | (ac97->num << 7)) << ACREGACC_REG_SHIFT) |
  92                      (val << ACREGACC_DAT_SHIFT),
  93                      base + ACREGACC);
  94         __raw_writel(ACINT_REGACCRDY, base + ACINTEN);
  95         if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(dev), HZ)) {
  96                 dev_err(dev->soc_dev.dev,
  97                         "ac97 write timeout (reg %#x)\n", reg);
  98         }
  99         __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
 100 }
 101
 102 static void txx9aclc_ac97_cold_reset(struct snd_ac97 *ac97)
 103 {
 104         struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
 105         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
 106         void __iomem *base = drvdata->base;
 107         u32 ready = ACINT_CODECRDY(ac97->num) | ACINT_REGACCRDY;
 108
 109         __raw_writel(ACCTL_ENLINK, base + ACCTLDIS);
 110         mmiowb();
 111         udelay(1);
 112         __raw_writel(ACCTL_ENLINK, base + ACCTLEN);
 113         /* wait for primary codec ready status */
 114         __raw_writel(ready, base + ACINTEN);
 115         if (!wait_event_timeout(ac97_waitq,
 116                                 (__raw_readl(base + ACINTSTS) & ready) == ready,
 117                                 HZ)) {
 118                 dev_err(&ac97->dev, "primary codec is not ready "
 119                         "(status %#x)\n",
 120                         __raw_readl(base + ACINTSTS));
 121         }
 122         __raw_writel(ACINT_REGACCRDY, base + ACINTSTS);
 123         __raw_writel(ready, base + ACINTDIS);
 124 }
 125
 126 /* AC97 controller operations */
 127 struct snd_ac97_bus_ops soc_ac97_ops = {
 128         .read           = txx9aclc_ac97_read,
 129         .write          = txx9aclc_ac97_write,
 130         .reset          = txx9aclc_ac97_cold_reset,
 131 };
 132 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 133
 134 static irqreturn_t txx9aclc_ac97_irq(int irq, void *dev_id)
 135 {
 136         struct txx9aclc_plat_drvdata *drvdata = dev_id;
 137         void __iomem *base = drvdata->base;
 138
 139         __raw_writel(__raw_readl(base + ACINTMSTS), base + ACINTDIS);
 140         wake_up(&ac97_waitq);
 141         return IRQ_HANDLED;
 142 }
 143
 144 static int txx9aclc_ac97_probe(struct platform_device *pdev,
 145                                struct snd_soc_dai *dai)
 146 {
 147         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 148         struct txx9aclc_soc_device *dev =
 149                 container_of(socdev, struct txx9aclc_soc_device, soc_dev);
 150
 151         dev->aclc_pdev = to_platform_device(dai->dev);
 152         txx9aclc_soc_dev = dev;
 153         return 0;
 154 }
 155
 156 static void txx9aclc_ac97_remove(struct platform_device *pdev,
 157                                  struct snd_soc_dai *dai)
 158 {
 159         struct platform_device *aclc_pdev = to_platform_device(dai->dev);
 160         struct txx9aclc_plat_drvdata *drvdata = platform_get_drvdata(aclc_pdev);
 161
 162         /* disable AC-link */
 163         __raw_writel(ACCTL_ENLINK, drvdata->base + ACCTLDIS);
 164         txx9aclc_soc_dev = NULL;
 165 }
 166
 167 struct snd_soc_dai txx9aclc_ac97_dai = {
 168         .name                   = "txx9aclc_ac97",
 169         .ac97_control           = 1,
 170         .probe                  = txx9aclc_ac97_probe,
 171         .remove                 = txx9aclc_ac97_remove,
 172         .playback = {
 173                 .rates          = AC97_RATES,
 174                 .formats        = AC97_FMTS,
 175                 .channels_min   = 2,
 176                 .channels_max   = 2,
 177         },
 178         .capture = {
 179                 .rates          = AC97_RATES,
 180                 .formats        = AC97_FMTS,
 181                 .channels_min   = 2,
 182                 .channels_max   = 2,
 183         },
 184 };
 185 EXPORT_SYMBOL_GPL(txx9aclc_ac97_dai);
 186
 187 static int __devinit txx9aclc_ac97_dev_probe(struct platform_device *pdev)
 188 {
 189         struct txx9aclc_plat_drvdata *drvdata;
 190         struct resource *r;
 191         int err;
 192         int irq;
 193
 194         irq = platform_get_irq(pdev, 0);
 195         if (irq < 0)
 196                 return irq;
 197         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 198         if (!r)
 199                 return -EBUSY;
 200
 201         if (!devm_request_mem_region(&pdev->dev, r->start, resource_size(r),
 202                                      dev_name(&pdev->dev)))
 203                 return -EBUSY;
 204
 205         drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
 206         if (!drvdata)
 207                 return -ENOMEM;
 208         platform_set_drvdata(pdev, drvdata);
 209         drvdata->physbase = r->start;
 210         if (sizeof(drvdata->physbase) > sizeof(r->start) &&
 211             r->start >= TXX9_DIRECTMAP_BASE &&
 212             r->start < TXX9_DIRECTMAP_BASE + 0x400000)
 213                 drvdata->physbase |= 0xf00000000ull;
 214         drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 215         if (!drvdata->base)
 216                 return -EBUSY;
 217         err = devm_request_irq(&pdev->dev, irq, txx9aclc_ac97_irq,
 218                                IRQF_DISABLED, dev_name(&pdev->dev), drvdata);
 219         if (err < 0)
 220                 return err;
 221
 222         txx9aclc_ac97_dai.dev = &pdev->dev;
 223         return snd_soc_register_dai(&txx9aclc_ac97_dai);
 224 }
 225
 226 static int __devexit txx9aclc_ac97_dev_remove(struct platform_device *pdev)
 227 {
 228         snd_soc_unregister_dai(&txx9aclc_ac97_dai);
 229         return 0;
 230 }
 231
 232 static struct platform_driver txx9aclc_ac97_driver = {
 233         .probe          = txx9aclc_ac97_dev_probe,
 234         .remove         = __devexit_p(txx9aclc_ac97_dev_remove),
 235         .driver         = {
 236                 .name   = "txx9aclc-ac97",
 237                 .owner  = THIS_MODULE,
 238         },
 239 };
 240
 241 static int __init txx9aclc_ac97_init(void)
 242 {
 243         return platform_driver_register(&txx9aclc_ac97_driver);
 244 }
 245
 246 static void __exit txx9aclc_ac97_exit(void)
 247 {
 248         platform_driver_unregister(&txx9aclc_ac97_driver);
 249 }
 250
 251 module_init(txx9aclc_ac97_init);
 252 module_exit(txx9aclc_ac97_exit);
 253
 254 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 255 MODULE_DESCRIPTION("TXx9 ACLC AC97 driver");
 256 MODULE_LICENSE("GPL");
 257 MODULE_ALIAS("platform:txx9aclc-ac97");