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_drvdata from snd_ac97? */
  40 static struct txx9aclc_plat_drvdata *txx9aclc_drvdata;
  41
  42 static int txx9aclc_regready(struct txx9aclc_plat_drvdata *drvdata)
  43 {
  44         return __raw_readl(drvdata->base + ACINTSTS) & ACINT_REGACCRDY;
  45 }
  46
  47 /* AC97 controller reads codec register */
  48 static unsigned short txx9aclc_ac97_read(struct snd_ac97 *ac97,
  49                                          unsigned short reg)
  50 {
  51         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
  52         void __iomem *base = drvdata->base;
  53         u32 dat;
  54
  55         if (!(__raw_readl(base + ACINTSTS) & ACINT_CODECRDY(ac97->num)))
  56                 return 0xffff;
  57         reg |= ac97->num << 7;
  58         dat = (reg << ACREGACC_REG_SHIFT) | ACREGACC_READ;
  59         __raw_writel(dat, base + ACREGACC);
  60         __raw_writel(ACINT_REGACCRDY, base + ACINTEN);
  61         if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(txx9aclc_drvdata), HZ)) {
  62                 __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
  63                 printk(KERN_ERR "ac97 read timeout (reg %#x)\n", reg);
  64                 dat = 0xffff;
  65                 goto done;
  66         }
  67         dat = __raw_readl(base + ACREGACC);
  68         if (((dat >> ACREGACC_REG_SHIFT) & 0xff) != reg) {
  69                 printk(KERN_ERR "reg mismatch %x with %x\n",
  70                         dat, reg);
  71                 dat = 0xffff;
  72                 goto done;
  73         }
  74         dat = (dat >> ACREGACC_DAT_SHIFT) & 0xffff;
  75 done:
  76         __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
  77         return dat;
  78 }
  79
  80 /* AC97 controller writes to codec register */
  81 static void txx9aclc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
  82                                 unsigned short val)
  83 {
  84         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
  85         void __iomem *base = drvdata->base;
  86
  87         __raw_writel(((reg | (ac97->num << 7)) << ACREGACC_REG_SHIFT) |
  88                      (val << ACREGACC_DAT_SHIFT),
  89                      base + ACREGACC);
  90         __raw_writel(ACINT_REGACCRDY, base + ACINTEN);
  91         if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(txx9aclc_drvdata), HZ)) {
  92                 printk(KERN_ERR
  93                         "ac97 write timeout (reg %#x)\n", reg);
  94         }
  95         __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
  96 }
  97
  98 static void txx9aclc_ac97_cold_reset(struct snd_ac97 *ac97)
  99 {
 100         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 101         void __iomem *base = drvdata->base;
 102         u32 ready = ACINT_CODECRDY(ac97->num) | ACINT_REGACCRDY;
 103
 104         __raw_writel(ACCTL_ENLINK, base + ACCTLDIS);
 105         mmiowb();
 106         udelay(1);
 107         __raw_writel(ACCTL_ENLINK, base + ACCTLEN);
 108         /* wait for primary codec ready status */
 109         __raw_writel(ready, base + ACINTEN);
 110         if (!wait_event_timeout(ac97_waitq,
 111                                 (__raw_readl(base + ACINTSTS) & ready) == ready,
 112                                 HZ)) {
 113                 dev_err(&ac97->dev, "primary codec is not ready "
 114                         "(status %#x)\n",
 115                         __raw_readl(base + ACINTSTS));
 116         }
 117         __raw_writel(ACINT_REGACCRDY, base + ACINTSTS);
 118         __raw_writel(ready, base + ACINTDIS);
 119 }
 120
 121 /* AC97 controller operations */
 122 static struct snd_ac97_bus_ops txx9aclc_ac97_ops = {
 123         .read           = txx9aclc_ac97_read,
 124         .write          = txx9aclc_ac97_write,
 125         .reset          = txx9aclc_ac97_cold_reset,
 126 };
 127
 128 static irqreturn_t txx9aclc_ac97_irq(int irq, void *dev_id)
 129 {
 130         struct txx9aclc_plat_drvdata *drvdata = dev_id;
 131         void __iomem *base = drvdata->base;
 132
 133         __raw_writel(__raw_readl(base + ACINTMSTS), base + ACINTDIS);
 134         wake_up(&ac97_waitq);
 135         return IRQ_HANDLED;
 136 }
 137
 138 static int txx9aclc_ac97_probe(struct snd_soc_dai *dai)
 139 {
 140         txx9aclc_drvdata = snd_soc_dai_get_drvdata(dai);
 141         return 0;
 142 }
 143
 144 static int txx9aclc_ac97_remove(struct snd_soc_dai *dai)
 145 {
 146         struct txx9aclc_plat_drvdata *drvdata = snd_soc_dai_get_drvdata(dai);
 147
 148         /* disable AC-link */
 149         __raw_writel(ACCTL_ENLINK, drvdata->base + ACCTLDIS);
 150         txx9aclc_drvdata = NULL;
 151         return 0;
 152 }
 153
 154 static struct snd_soc_dai_driver txx9aclc_ac97_dai = {
 155         .bus_control            = true,
 156         .probe                  = txx9aclc_ac97_probe,
 157         .remove                 = txx9aclc_ac97_remove,
 158         .playback = {
 159                 .rates          = AC97_RATES,
 160                 .formats        = AC97_FMTS,
 161                 .channels_min   = 2,
 162                 .channels_max   = 2,
 163         },
 164         .capture = {
 165                 .rates          = AC97_RATES,
 166                 .formats        = AC97_FMTS,
 167                 .channels_min   = 2,
 168                 .channels_max   = 2,
 169         },
 170 };
 171
 172 static const struct snd_soc_component_driver txx9aclc_ac97_component = {
 173         .name           = "txx9aclc-ac97",
 174 };
 175
 176 static int txx9aclc_ac97_dev_probe(struct platform_device *pdev)
 177 {
 178         struct txx9aclc_plat_drvdata *drvdata;
 179         struct resource *r;
 180         int err;
 181         int irq;
 182
 183         irq = platform_get_irq(pdev, 0);
 184         if (irq < 0)
 185                 return irq;
 186
 187         drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
 188         if (!drvdata)
 189                 return -ENOMEM;
 190
 191         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 192         drvdata->base = devm_ioremap_resource(&pdev->dev, r);
 193         if (IS_ERR(drvdata->base))
 194                 return PTR_ERR(drvdata->base);
 195
 196         platform_set_drvdata(pdev, drvdata);
 197         drvdata->physbase = r->start;
 198         if (sizeof(drvdata->physbase) > sizeof(r->start) &&
 199             r->start >= TXX9_DIRECTMAP_BASE &&
 200             r->start < TXX9_DIRECTMAP_BASE + 0x400000)
 201                 drvdata->physbase |= 0xf00000000ull;
 202         err = devm_request_irq(&pdev->dev, irq, txx9aclc_ac97_irq,
 203                                0, dev_name(&pdev->dev), drvdata);
 204         if (err < 0)
 205                 return err;
 206
 207         err = snd_soc_set_ac97_ops(&txx9aclc_ac97_ops);
 208         if (err < 0)
 209                 return err;
 210
 211         return snd_soc_register_component(&pdev->dev, &txx9aclc_ac97_component,
 212                                           &txx9aclc_ac97_dai, 1);
 213 }
 214
 215 static int txx9aclc_ac97_dev_remove(struct platform_device *pdev)
 216 {
 217         snd_soc_unregister_component(&pdev->dev);
 218         snd_soc_set_ac97_ops(NULL);
 219         return 0;
 220 }
 221
 222 static struct platform_driver txx9aclc_ac97_driver = {
 223         .probe          = txx9aclc_ac97_dev_probe,
 224         .remove         = txx9aclc_ac97_dev_remove,
 225         .driver         = {
 226                 .name   = "txx9aclc-ac97",
 227         },
 228 };
 229
 230 module_platform_driver(txx9aclc_ac97_driver);
 231
 232 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 233 MODULE_DESCRIPTION("TXx9 ACLC AC97 driver");
 234 MODULE_LICENSE("GPL");
 235 MODULE_ALIAS("platform:txx9aclc-ac97");