[ALSA] ASoC S3C24xx machine drivers - s3c2443-AC97

This patch adds AC97 support to the Samsung S3C2443 CPU.

Signed-off-by: Graeme Gregory <gg@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 401 insertions, 0 deletions

diff --git a/sound/soc/s3c24xx/s3c2443-ac97.c b/sound/soc/s3c24xx/s3c2443-ac97.c
new file mode 100644
index 000000000000..75acf7ef5528
--- /dev/null
+++ b/sound/soc/s3c24xx/s3c2443-ac97.c
@@ -0,0 +1,401 @@
+/*
+ * s3c2443-ac97.c  --  ALSA Soc Audio Layer
+ *
+ * (c) 2007 Wolfson Microelectronics PLC.
+ * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
+ *
+ *  Copyright (C) 2005, Sean Choi <sh428.choi@samsung.com>
+ *  All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  Revision history
+ *      21st Mar 2007   Initial Version
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/ac97_codec.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/arch/regs-ac97.h>
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/regs-clock.h>
+#include <asm/arch/audio.h>
+#include <asm/dma.h>
+#include <asm/arch/dma.h>
+
+#include "s3c24xx-pcm.h"
+#include "s3c24xx-ac97.h"
+
+struct s3c24xx_ac97_info {
+        void __iomem    *regs;
+        struct clk      *ac97_clk;
+};
+static struct s3c24xx_ac97_info s3c24xx_ac97;
+
+DECLARE_COMPLETION(ac97_completion);
+static u32 codec_ready;
+static DECLARE_MUTEX(ac97_mutex);
+
+static unsigned short s3c2443_ac97_read(struct snd_ac97 *ac97,
+        unsigned short reg)
+{
+        u32 ac_glbctrl;
+        u32 ac_codec_cmd;
+        u32 stat, addr, data;
+
+        down(&ac97_mutex);
+
+        codec_ready = S3C_AC97_GLBSTAT_CODECREADY;
+        ac_codec_cmd = readl(s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
+        ac_codec_cmd = S3C_AC97_CODEC_CMD_READ | AC_CMD_ADDR(reg);
+        writel(ac_codec_cmd, s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
+
+        udelay(50);
+
+        ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+
+        wait_for_completion(&ac97_completion);
+
+        stat = readl(s3c24xx_ac97.regs + S3C_AC97_STAT);
+        addr = (stat >> 16) & 0x7f;
+        data = (stat & 0xffff);
+
+        if (addr != reg)
+                printk(KERN_ERR "s3c24xx-ac97: req addr = %02x,"
+                                " rep addr = %02x\n", reg, addr);
+
+        up(&ac97_mutex);
+
+        return (unsigned short)data;
+}
+
+static void s3c2443_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
+        unsigned short val)
+{
+        u32 ac_glbctrl;
+        u32 ac_codec_cmd;
+
+        down(&ac97_mutex);
+
+        codec_ready = S3C_AC97_GLBSTAT_CODECREADY;
+        ac_codec_cmd = readl(s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
+        ac_codec_cmd = AC_CMD_ADDR(reg) | AC_CMD_DATA(val);
+        writel(ac_codec_cmd, s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
+
+        udelay(50);
+
+        ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+
+        wait_for_completion(&ac97_completion);
+
+        ac_codec_cmd = readl(s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
+        ac_codec_cmd |= S3C_AC97_CODEC_CMD_READ;
+        writel(ac_codec_cmd, s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
+
+        up(&ac97_mutex);
+
+}
+
+static void s3c2443_ac97_warm_reset(struct snd_ac97 *ac97)
+{
+        u32 ac_glbctrl;
+
+        ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl = S3C_AC97_GLBCTRL_WARMRESET;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        ac_glbctrl = 0;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+}
+
+static void s3c2443_ac97_cold_reset(struct snd_ac97 *ac97)
+{
+        u32 ac_glbctrl;
+
+        ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl = S3C_AC97_GLBCTRL_COLDRESET;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        ac_glbctrl = 0;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        ac_glbctrl |= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        ac_glbctrl |= S3C_AC97_GLBCTRL_PCMOUTTM_DMA |
+                S3C_AC97_GLBCTRL_PCMINTM_DMA | S3C_AC97_GLBCTRL_MICINTM_DMA;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+}
+
+static irqreturn_t s3c2443_ac97_irq(int irq, void *dev_id)
+{
+        int status;
+        u32 ac_glbctrl;
+
+        status = readl(s3c24xx_ac97.regs + S3C_AC97_GLBSTAT) & codec_ready;
+
+        if (status) {
+                ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+                ac_glbctrl &= ~S3C_AC97_GLBCTRL_CODECREADYIE;
+                writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+                complete(&ac97_completion);
+        }
+        return IRQ_HANDLED;
+}
+
+struct snd_ac97_bus_ops soc_ac97_ops = {
+        .read   = s3c2443_ac97_read,
+        .write  = s3c2443_ac97_write,
+        .warm_reset     = s3c2443_ac97_warm_reset,
+        .reset  = s3c2443_ac97_cold_reset,
+};
+
+static struct s3c2410_dma_client s3c2443_dma_client_out = {
+        .name = "AC97 PCM Stereo out"
+};
+
+static struct s3c2410_dma_client s3c2443_dma_client_in = {
+        .name = "AC97 PCM Stereo in"
+};
+
+static struct s3c2410_dma_client s3c2443_dma_client_micin = {
+        .name = "AC97 Mic Mono in"
+};
+
+static struct s3c24xx_pcm_dma_params s3c2443_ac97_pcm_stereo_out = {
+        .client         = &s3c2443_dma_client_out,
+        .channel        = DMACH_PCM_OUT,
+        .dma_addr       = S3C2440_PA_AC97 + S3C_AC97_PCM_DATA,
+        .dma_size       = 4,
+};
+
+static struct s3c24xx_pcm_dma_params s3c2443_ac97_pcm_stereo_in = {
+        .client         = &s3c2443_dma_client_in,
+        .channel        = DMACH_PCM_IN,
+        .dma_addr       = S3C2440_PA_AC97 + S3C_AC97_PCM_DATA,
+        .dma_size       = 4,
+};
+
+static struct s3c24xx_pcm_dma_params s3c2443_ac97_mic_mono_in = {
+        .client         = &s3c2443_dma_client_micin,
+        .channel        = DMACH_MIC_IN,
+        .dma_addr       = S3C2440_PA_AC97 + S3C_AC97_MIC_DATA,
+        .dma_size       = 4,
+};
+
+static int s3c2443_ac97_probe(struct platform_device *pdev)
+{
+        int ret;
+        u32 ac_glbctrl;
+
+        s3c24xx_ac97.regs = ioremap(S3C2440_PA_AC97, 0x100);
+        if (s3c24xx_ac97.regs == NULL)
+                return -ENXIO;
+
+        s3c24xx_ac97.ac97_clk = clk_get(&pdev->dev, "ac97");
+        if (s3c24xx_ac97.ac97_clk == NULL) {
+                printk(KERN_ERR "s3c2443-ac97 failed to get ac97_clock\n");
+                iounmap(s3c24xx_ac97.regs);
+                return -ENODEV;
+        }
+        clk_enable(s3c24xx_ac97.ac97_clk);
+
+        s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2443_GPE0_AC_nRESET);
+        s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2443_GPE1_AC_SYNC);
+        s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2443_GPE2_AC_BITCLK);
+        s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2443_GPE3_AC_SDI);
+        s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2443_GPE4_AC_SDO);
+
+        ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl = S3C_AC97_GLBCTRL_COLDRESET;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        ac_glbctrl = 0;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        ac_glbctrl |= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+
+        ret = request_irq(IRQ_S3C2443_AC97, s3c2443_ac97_irq,
+                IRQF_DISABLED, "AC97", NULL);
+        if (ret < 0) {
+                printk(KERN_ERR "s3c24xx-ac97: interrupt request failed.\n");
+                clk_disable(s3c24xx_ac97.ac97_clk);
+                clk_put(s3c24xx_ac97.ac97_clk);
+                iounmap(s3c24xx_ac97.regs);
+        }
+        return ret;
+}
+
+static void s3c2443_ac97_remove(struct platform_device *pdev)
+{
+        free_irq(IRQ_S3C2443_AC97, NULL);
+        clk_disable(s3c24xx_ac97.ac97_clk);
+        clk_put(s3c24xx_ac97.ac97_clk);
+        iounmap(s3c24xx_ac97.regs);
+}
+
+static int s3c2443_ac97_hw_params(struct snd_pcm_substream *substream,
+                                struct snd_pcm_hw_params *params)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                cpu_dai->dma_data = &s3c2443_ac97_pcm_stereo_out;
+        else
+                cpu_dai->dma_data = &s3c2443_ac97_pcm_stereo_in;
+
+        return 0;
+}
+
+static int s3c2443_ac97_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+        u32 ac_glbctrl;
+
+        ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        switch(cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+                        ac_glbctrl |= S3C_AC97_GLBCTRL_PCMINTM_DMA;
+                else
+                        ac_glbctrl |= S3C_AC97_GLBCTRL_PCMOUTTM_DMA;
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+                        ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
+                else
+                        ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMOUTTM_MASK;
+                break;
+        }
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+
+        return 0;
+}
+
+static int s3c2443_ac97_hw_mic_params(struct snd_pcm_substream *substream,
+        struct snd_pcm_hw_params *params)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                return -ENODEV;
+        else
+                cpu_dai->dma_data = &s3c2443_ac97_mic_mono_in;
+
+        return 0;
+}
+
+static int s3c2443_ac97_mic_trigger(struct snd_pcm_substream *substream,
+        int cmd)
+{
+        u32 ac_glbctrl;
+
+        ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+        switch(cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                ac_glbctrl |= S3C_AC97_GLBCTRL_PCMINTM_DMA;
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
+        }
+        writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
+
+        return 0;
+}
+
+#define s3c2443_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
+                SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
+                SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
+
+struct snd_soc_cpu_dai s3c2443_ac97_dai[] = {
+{
+        .name = "s3c2443-ac97",
+        .id = 0,
+        .type = SND_SOC_DAI_AC97,
+        .probe = s3c2443_ac97_probe,
+        .remove = s3c2443_ac97_remove,
+        .playback = {
+                .stream_name = "AC97 Playback",
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = s3c2443_AC97_RATES,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+        .capture = {
+                .stream_name = "AC97 Capture",
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = s3c2443_AC97_RATES,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+        .ops = {
+                .hw_params = s3c2443_ac97_hw_params,
+                .trigger = s3c2443_ac97_trigger},
+},
+{
+        .name = "pxa2xx-ac97-mic",
+        .id = 1,
+        .type = SND_SOC_DAI_AC97,
+        .capture = {
+                .stream_name = "AC97 Mic Capture",
+                .channels_min = 1,
+                .channels_max = 1,
+                .rates = s3c2443_AC97_RATES,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+        .ops = {
+                .hw_params = s3c2443_ac97_hw_mic_params,
+                .trigger = s3c2443_ac97_mic_trigger,},
+},
+};
+
+EXPORT_SYMBOL_GPL(s3c2443_ac97_dai);
+EXPORT_SYMBOL_GPL(soc_ac97_ops);
+
+MODULE_AUTHOR("Graeme Gregory");
+MODULE_DESCRIPTION("AC97 driver for the Samsung s3c2443 chip");
+MODULE_LICENSE("GPL");