sound/soc/au1x/sample-ac97.c

   1 /*
   2  * Sample Au12x0/Au1550 PSC AC97 sound machine.
   3  *
   4  * Copyright (c) 2007-2008 Manuel Lauss <mano@roarinelk.homelinux.net>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms outlined in the file COPYING at the root of this
   8  *  source archive.
   9  *
  10  * This is a very generic AC97 sound machine driver for boards which
  11  * have (AC97) audio at PSC1 (e.g. DB1200 demoboards).
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/timer.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/platform_device.h>
  19 #include <sound/core.h>
  20 #include <sound/pcm.h>
  21 #include <sound/soc.h>
  22 #include <sound/soc-dapm.h>
  23 #include <asm/mach-au1x00/au1000.h>
  24 #include <asm/mach-au1x00/au1xxx_psc.h>
  25 #include <asm/mach-au1x00/au1xxx_dbdma.h>
  26
  27 #include "../codecs/ac97.h"
  28 #include "psc.h"
  29
  30 static int au1xpsc_sample_ac97_init(struct snd_soc_codec *codec)
  31 {
  32         snd_soc_dapm_sync(codec);
  33         return 0;
  34 }
  35
  36 static struct snd_soc_dai_link au1xpsc_sample_ac97_dai = {
  37         .name           = "AC97",
  38         .stream_name    = "AC97 HiFi",
  39         .cpu_dai        = &au1xpsc_ac97_dai,    /* see psc-ac97.c */
  40         .codec_dai      = &ac97_dai,            /* see codecs/ac97.c */
  41         .init           = au1xpsc_sample_ac97_init,
  42         .ops            = NULL,
  43 };
  44
  45 static struct snd_soc_machine au1xpsc_sample_ac97_machine = {
  46         .name           = "Au1xxx PSC AC97 Audio",
  47         .dai_link       = &au1xpsc_sample_ac97_dai,
  48         .num_links      = 1,
  49 };
  50
  51 static struct snd_soc_device au1xpsc_sample_ac97_devdata = {
  52         .machine        = &au1xpsc_sample_ac97_machine,
  53         .platform       = &au1xpsc_soc_platform, /* see dbdma2.c */
  54         .codec_dev      = &soc_codec_dev_ac97,
  55 };
  56
  57 static struct resource au1xpsc_psc1_res[] = {
  58         [0] = {
  59                 .start  = CPHYSADDR(PSC1_BASE_ADDR),
  60                 .end    = CPHYSADDR(PSC1_BASE_ADDR) + 0x000fffff,
  61                 .flags  = IORESOURCE_MEM,
  62         },
  63         [1] = {
  64 #ifdef CONFIG_SOC_AU1200
  65                 .start  = AU1200_PSC1_INT,
  66                 .end    = AU1200_PSC1_INT,
  67 #elif defined(CONFIG_SOC_AU1550)
  68                 .start  = AU1550_PSC1_INT,
  69                 .end    = AU1550_PSC1_INT,
  70 #endif
  71                 .flags  = IORESOURCE_IRQ,
  72         },
  73         [2] = {
  74                 .start  = DSCR_CMD0_PSC1_TX,
  75                 .end    = DSCR_CMD0_PSC1_TX,
  76                 .flags  = IORESOURCE_DMA,
  77         },
  78         [3] = {
  79                 .start  = DSCR_CMD0_PSC1_RX,
  80                 .end    = DSCR_CMD0_PSC1_RX,
  81                 .flags  = IORESOURCE_DMA,
  82         },
  83 };
  84
  85 static struct platform_device *au1xpsc_sample_ac97_dev;
  86
  87 static int __init au1xpsc_sample_ac97_load(void)
  88 {
  89         int ret;
  90
  91 #ifdef CONFIG_SOC_AU1200
  92         unsigned long io;
  93
  94         /* modify sys_pinfunc for AC97 on PSC1 */
  95         io = au_readl(SYS_PINFUNC);
  96         io |= SYS_PINFUNC_P1C;
  97         io &= ~(SYS_PINFUNC_P1A | SYS_PINFUNC_P1B);
  98         au_writel(io, SYS_PINFUNC);
  99         au_sync();
 100 #endif
 101
 102         ret = -ENOMEM;
 103
 104         /* setup PSC clock source for AC97 part: external clock provided
 105          * by codec.  The psc-ac97.c driver depends on this setting!
 106          */
 107         au_writel(PSC_SEL_CLK_SERCLK, PSC1_BASE_ADDR + PSC_SEL_OFFSET);
 108         au_sync();
 109
 110         au1xpsc_sample_ac97_dev = platform_device_alloc("soc-audio", -1);
 111         if (!au1xpsc_sample_ac97_dev)
 112                 goto out;
 113
 114         au1xpsc_sample_ac97_dev->resource =
 115                 kmemdup(au1xpsc_psc1_res, sizeof(struct resource) *
 116                         ARRAY_SIZE(au1xpsc_psc1_res), GFP_KERNEL);
 117         au1xpsc_sample_ac97_dev->num_resources = ARRAY_SIZE(au1xpsc_psc1_res);
 118         au1xpsc_sample_ac97_dev->id = 1;
 119
 120         platform_set_drvdata(au1xpsc_sample_ac97_dev,
 121                              &au1xpsc_sample_ac97_devdata);
 122         au1xpsc_sample_ac97_devdata.dev = &au1xpsc_sample_ac97_dev->dev;
 123         ret = platform_device_add(au1xpsc_sample_ac97_dev);
 124
 125         if (ret) {
 126                 platform_device_put(au1xpsc_sample_ac97_dev);
 127                 au1xpsc_sample_ac97_dev = NULL;
 128         }
 129
 130 out:
 131         return ret;
 132 }
 133
 134 static void __exit au1xpsc_sample_ac97_exit(void)
 135 {
 136         platform_device_unregister(au1xpsc_sample_ac97_dev);
 137 }
 138
 139 module_init(au1xpsc_sample_ac97_load);
 140 module_exit(au1xpsc_sample_ac97_exit);
 141
 142 MODULE_LICENSE("GPL");
 143 MODULE_DESCRIPTION("Au1xxx PSC sample AC97 machine");
 144 MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");