sound/soc/txx9/txx9aclc-ac97.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * TXx9 ACLC AC97 driver
   4  *
   5  * Copyright (C) 2009 Atsushi Nemoto
   6  *
   7  * Based on RBTX49xx patch from CELF patch archive.
   8  * (C) Copyright TOSHIBA CORPORATION 2004-2006
   9  */
  10
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/delay.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/io.h>
  16 #include <linux/gfp.h>
  17 #include <sound/core.h>
  18 #include <sound/pcm.h>
  19 #include <sound/soc.h>
  20 #include "txx9aclc.h"
  21
  22 #define AC97_DIR        \
  23         (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
  24
  25 #define AC97_RATES      \
  26         SNDRV_PCM_RATE_8000_48000
  27
  28 #ifdef __BIG_ENDIAN
  29 #define AC97_FMTS       SNDRV_PCM_FMTBIT_S16_BE
  30 #else
  31 #define AC97_FMTS       SNDRV_PCM_FMTBIT_S16_LE
  32 #endif
  33
  34 static DECLARE_WAIT_QUEUE_HEAD(ac97_waitq);
  35
  36 /* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */
  37 static struct txx9aclc_plat_drvdata *txx9aclc_drvdata;
  38
  39 static int txx9aclc_regready(struct txx9aclc_plat_drvdata *drvdata)
  40 {
  41         return __raw_readl(drvdata->base + ACINTSTS) & ACINT_REGACCRDY;
  42 }
  43
  44 /* AC97 controller reads codec register */
  45 static unsigned short txx9aclc_ac97_read(struct snd_ac97 *ac97,
  46                                          unsigned short reg)
  47 {
  48         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
  49         void __iomem *base = drvdata->base;
  50         u32 dat;
  51
  52         if (!(__raw_readl(base + ACINTSTS) & ACINT_CODECRDY(ac97->num)))
  53                 return 0xffff;
  54         reg |= ac97->num << 7;
  55         dat = (reg << ACREGACC_REG_SHIFT) | ACREGACC_READ;
  56         __raw_writel(dat, base + ACREGACC);
  57         __raw_writel(ACINT_REGACCRDY, base + ACINTEN);
  58         if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(txx9aclc_drvdata), HZ)) {
  59                 __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
  60                 printk(KERN_ERR "ac97 read timeout (reg %#x)\n", reg);
  61                 dat = 0xffff;
  62                 goto done;
  63         }
  64         dat = __raw_readl(base + ACREGACC);
  65         if (((dat >> ACREGACC_REG_SHIFT) & 0xff) != reg) {
  66                 printk(KERN_ERR "reg mismatch %x with %x\n",
  67                         dat, reg);
  68                 dat = 0xffff;
  69                 goto done;
  70         }
  71         dat = (dat >> ACREGACC_DAT_SHIFT) & 0xffff;
  72 done:
  73         __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
  74         return dat;
  75 }
  76
  77 /* AC97 controller writes to codec register */
  78 static void txx9aclc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
  79                                 unsigned short val)
  80 {
  81         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
  82         void __iomem *base = drvdata->base;
  83
  84         __raw_writel(((reg | (ac97->num << 7)) << ACREGACC_REG_SHIFT) |
  85                      (val << ACREGACC_DAT_SHIFT),
  86                      base + ACREGACC);
  87         __raw_writel(ACINT_REGACCRDY, base + ACINTEN);
  88         if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(txx9aclc_drvdata), HZ)) {
  89                 printk(KERN_ERR
  90                         "ac97 write timeout (reg %#x)\n", reg);
  91         }
  92         __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
  93 }
  94
  95 static void txx9aclc_ac97_cold_reset(struct snd_ac97 *ac97)
  96 {
  97         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
  98         void __iomem *base = drvdata->base;
  99         u32 ready = ACINT_CODECRDY(ac97->num) | ACINT_REGACCRDY;
 100
 101         __raw_writel(ACCTL_ENLINK, base + ACCTLDIS);
 102         udelay(1);
 103         __raw_writel(ACCTL_ENLINK, base + ACCTLEN);
 104         /* wait for primary codec ready status */
 105         __raw_writel(ready, base + ACINTEN);
 106         if (!wait_event_timeout(ac97_waitq,
 107                                 (__raw_readl(base + ACINTSTS) & ready) == ready,
 108                                 HZ)) {
 109                 dev_err(&ac97->dev, "primary codec is not ready "
 110                         "(status %#x)\n",
 111                         __raw_readl(base + ACINTSTS));
 112         }
 113         __raw_writel(ACINT_REGACCRDY, base + ACINTSTS);
 114         __raw_writel(ready, base + ACINTDIS);
 115 }
 116
 117 /* AC97 controller operations */
 118 static struct snd_ac97_bus_ops txx9aclc_ac97_ops = {
 119         .read           = txx9aclc_ac97_read,
 120         .write          = txx9aclc_ac97_write,
 121         .reset          = txx9aclc_ac97_cold_reset,
 122 };
 123
 124 static irqreturn_t txx9aclc_ac97_irq(int irq, void *dev_id)
 125 {
 126         struct txx9aclc_plat_drvdata *drvdata = dev_id;
 127         void __iomem *base = drvdata->base;
 128
 129         __raw_writel(__raw_readl(base + ACINTMSTS), base + ACINTDIS);
 130         wake_up(&ac97_waitq);
 131         return IRQ_HANDLED;
 132 }
 133
 134 static int txx9aclc_ac97_probe(struct snd_soc_dai *dai)
 135 {
 136         txx9aclc_drvdata = snd_soc_dai_get_drvdata(dai);
 137         return 0;
 138 }
 139
 140 static int txx9aclc_ac97_remove(struct snd_soc_dai *dai)
 141 {
 142         struct txx9aclc_plat_drvdata *drvdata = snd_soc_dai_get_drvdata(dai);
 143
 144         /* disable AC-link */
 145         __raw_writel(ACCTL_ENLINK, drvdata->base + ACCTLDIS);
 146         txx9aclc_drvdata = NULL;
 147         return 0;
 148 }
 149
 150 static struct snd_soc_dai_driver txx9aclc_ac97_dai = {
 151         .bus_control            = true,
 152         .probe                  = txx9aclc_ac97_probe,
 153         .remove                 = txx9aclc_ac97_remove,
 154         .playback = {
 155                 .rates          = AC97_RATES,
 156                 .formats        = AC97_FMTS,
 157                 .channels_min   = 2,
 158                 .channels_max   = 2,
 159         },
 160         .capture = {
 161                 .rates          = AC97_RATES,
 162                 .formats        = AC97_FMTS,
 163                 .channels_min   = 2,
 164                 .channels_max   = 2,
 165         },
 166 };
 167
 168 static const struct snd_soc_component_driver txx9aclc_ac97_component = {
 169         .name           = "txx9aclc-ac97",
 170 };
 171
 172 static int txx9aclc_ac97_dev_probe(struct platform_device *pdev)
 173 {
 174         struct txx9aclc_plat_drvdata *drvdata;
 175         struct resource *r;
 176         int err;
 177         int irq;
 178
 179         irq = platform_get_irq(pdev, 0);
 180         if (irq < 0)
 181                 return irq;
 182
 183         drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
 184         if (!drvdata)
 185                 return -ENOMEM;
 186
 187         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 188         drvdata->base = devm_ioremap_resource(&pdev->dev, r);
 189         if (IS_ERR(drvdata->base))
 190                 return PTR_ERR(drvdata->base);
 191
 192         platform_set_drvdata(pdev, drvdata);
 193         drvdata->physbase = r->start;
 194         if (sizeof(drvdata->physbase) > sizeof(r->start) &&
 195             r->start >= TXX9_DIRECTMAP_BASE &&
 196             r->start < TXX9_DIRECTMAP_BASE + 0x400000)
 197                 drvdata->physbase |= 0xf00000000ull;
 198         err = devm_request_irq(&pdev->dev, irq, txx9aclc_ac97_irq,
 199                                0, dev_name(&pdev->dev), drvdata);
 200         if (err < 0)
 201                 return err;
 202
 203         err = snd_soc_set_ac97_ops(&txx9aclc_ac97_ops);
 204         if (err < 0)
 205                 return err;
 206
 207         return devm_snd_soc_register_component(&pdev->dev, &txx9aclc_ac97_component,
 208                                           &txx9aclc_ac97_dai, 1);
 209 }
 210
 211 static int txx9aclc_ac97_dev_remove(struct platform_device *pdev)
 212 {
 213         snd_soc_set_ac97_ops(NULL);
 214         return 0;
 215 }
 216
 217 static struct platform_driver txx9aclc_ac97_driver = {
 218         .probe          = txx9aclc_ac97_dev_probe,
 219         .remove         = txx9aclc_ac97_dev_remove,
 220         .driver         = {
 221                 .name   = "txx9aclc-ac97",
 222         },
 223 };
 224
 225 module_platform_driver(txx9aclc_ac97_driver);
 226
 227 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 228 MODULE_DESCRIPTION("TXx9 ACLC AC97 driver");
 229 MODULE_LICENSE("GPL");
 230 MODULE_ALIAS("platform:txx9aclc-ac97");