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