1 files changed, 430 insertions, 0 deletions

diff --git a/sound/soc/nuc900/nuc900-ac97.c b/sound/soc/nuc900/nuc900-ac97.c
new file mode 100644
index 000000000000..caa7c901bc2e
--- /dev/null
+++ b/sound/soc/nuc900/nuc900-ac97.c
@@ -0,0 +1,430 @@
+/*
+ * Copyright (c) 2009-2010 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;version 2 of the License.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/suspend.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+#include <linux/device.h>
+#include <linux/clk.h>
+
+#include <mach/mfp.h>
+
+#include "nuc900-audio.h"
+
+static DEFINE_MUTEX(ac97_mutex);
+struct nuc900_audio *nuc900_ac97_data;
+
+static int nuc900_checkready(void)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+
+        if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
+                return -EPERM;
+
+        return 0;
+}
+
+/* AC97 controller reads codec register */
+static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97,
+                                        unsigned short reg)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+        unsigned long timeout = 0x10000, val;
+
+        mutex_lock(&ac97_mutex);
+
+        val = nuc900_checkready();
+        if (!!val) {
+                dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
+                goto out;
+        }
+
+        /* set the R_WB bit and write register index */
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB | reg);
+
+        /* set the valid frame bit and valid slots */
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+        val |= (VALID_FRAME | SLOT1_VALID);
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
+
+        udelay(100);
+
+        /* polling the AC_R_FINISH */
+        while (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_R_FINISH)
+                                                                && timeout--)
+                mdelay(1);
+
+        if (!timeout) {
+                dev_err(nuc900_audio->dev, "AC97 read register time out !\n");
+                val = -EPERM;
+                goto out;
+        }
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ;
+        val &= ~SLOT1_VALID;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
+
+        if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) {
+                dev_err(nuc900_audio->dev,
+                                "R_INDEX of REG_ACTL_ACIS1 not match!\n");
+        }
+
+        udelay(100);
+        val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF);
+
+out:
+        mutex_unlock(&ac97_mutex);
+        return val;
+}
+
+/* AC97 controller writes to codec register */
+static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
+                                unsigned short val)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+        unsigned long tmp, timeout = 0x10000;
+
+        mutex_lock(&ac97_mutex);
+
+        tmp = nuc900_checkready();
+        if (!!tmp)
+                dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
+
+        /* clear the R_WB bit and write register index */
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg);
+
+        /* write register value */
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val);
+
+        /* set the valid frame bit and valid slots */
+        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+        tmp |= SLOT1_VALID | SLOT2_VALID | VALID_FRAME;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
+
+        udelay(100);
+
+        /* polling the AC_W_FINISH */
+        while ((AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_W_FINISH)
+                                                                && timeout--)
+                mdelay(1);
+
+        if (!timeout)
+                dev_err(nuc900_audio->dev, "AC97 write register time out !\n");
+
+        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+        tmp &= ~(SLOT1_VALID | SLOT2_VALID);
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
+
+        mutex_unlock(&ac97_mutex);
+
+}
+
+static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+        unsigned long val;
+
+        mutex_lock(&ac97_mutex);
+
+        /* warm reset AC 97 */
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
+        val |= AC_W_RES;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
+
+        udelay(100);
+
+        val = nuc900_checkready();
+        if (!!val)
+                dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
+
+        mutex_unlock(&ac97_mutex);
+}
+
+static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+        unsigned long val;
+
+        mutex_lock(&ac97_mutex);
+
+        /* reset Audio Controller */
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+        val |= ACTL_RESET_BIT;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+        val &= (~ACTL_RESET_BIT);
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+        /* reset AC-link interface */
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+        val |= AC_RESET;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+        val &= ~AC_RESET;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+        /* cold reset AC 97 */
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
+        val |= AC_C_RES;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
+        val &= (~AC_C_RES);
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
+
+        udelay(100);
+
+        mutex_unlock(&ac97_mutex);
+
+}
+
+/* AC97 controller operations */
+struct snd_ac97_bus_ops soc_ac97_ops = {
+        .read           = nuc900_ac97_read,
+        .write          = nuc900_ac97_write,
+        .reset          = nuc900_ac97_cold_reset,
+        .warm_reset     = nuc900_ac97_warm_reset,
+}
+EXPORT_SYMBOL_GPL(soc_ac97_ops);
+
+static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
+                                int cmd, struct snd_soc_dai *dai)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+        int ret;
+        unsigned long val, tmp;
+
+        ret = 0;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+                val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+                if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+                        tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME);
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
+
+                        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
+                        tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ);
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp);
+                        val |= AC_PLAY;
+                } else {
+                        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
+                        tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ);
+
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp);
+                        val |= AC_RECORD;
+                }
+
+                AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+                val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+                if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+                        tmp &= ~(SLOT3_VALID | SLOT4_VALID);
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
+
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR);
+                        val &= ~AC_PLAY;
+                } else {
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR);
+                        val &= ~AC_RECORD;
+                }
+
+                AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+                break;
+        default:
+                ret = -EINVAL;
+        }
+
+        return ret;
+}
+
+static int nuc900_ac97_probe(struct platform_device *pdev,
+                                        struct snd_soc_dai *dai)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+        unsigned long val;
+
+        mutex_lock(&ac97_mutex);
+
+        /* enable unit clock */
+        clk_enable(nuc900_audio->clk);
+
+        /* enable audio controller and AC-link interface */
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
+        val |= (IIS_AC_PIN_SEL | ACLINK_EN);
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
+
+        mutex_unlock(&ac97_mutex);
+
+        return 0;
+}
+
+static void nuc900_ac97_remove(struct platform_device *pdev,
+                                                struct snd_soc_dai *dai)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+
+        clk_disable(nuc900_audio->clk);
+}
+
+static struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
+        .trigger        = nuc900_ac97_trigger,
+};
+
+struct snd_soc_dai nuc900_ac97_dai = {
+        .name                   = "nuc900-ac97",
+        .probe                  = nuc900_ac97_probe,
+        .remove                 = nuc900_ac97_remove,
+        .ac97_control           = 1,
+        .playback = {
+                .rates          = SNDRV_PCM_RATE_8000_48000,
+                .formats        = SNDRV_PCM_FMTBIT_S16_LE,
+                .channels_min   = 1,
+                .channels_max   = 2,
+        },
+        .capture = {
+                .rates          = SNDRV_PCM_RATE_8000_48000,
+                .formats        = SNDRV_PCM_FMTBIT_S16_LE,
+                .channels_min   = 1,
+                .channels_max   = 2,
+        },
+        .ops = &nuc900_ac97_dai_ops,
+}
+EXPORT_SYMBOL_GPL(nuc900_ac97_dai);
+
+static int __devinit nuc900_ac97_drvprobe(struct platform_device *pdev)
+{
+        struct nuc900_audio *nuc900_audio;
+        int ret;
+
+        if (nuc900_ac97_data)
+                return -EBUSY;
+
+        nuc900_audio = kzalloc(sizeof(struct nuc900_audio), GFP_KERNEL);
+        if (!nuc900_audio)
+                return -ENOMEM;
+
+        spin_lock_init(&nuc900_audio->lock);
+
+        nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!nuc900_audio->res) {
+                ret = -ENODEV;
+                goto out0;
+        }
+
+        if (!request_mem_region(nuc900_audio->res->start,
+                        resource_size(nuc900_audio->res), pdev->name)) {
+                ret = -EBUSY;
+                goto out0;
+        }
+
+        nuc900_audio->mmio = ioremap(nuc900_audio->res->start,
+                                        resource_size(nuc900_audio->res));
+        if (!nuc900_audio->mmio) {
+                ret = -ENOMEM;
+                goto out1;
+        }
+
+        nuc900_audio->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(nuc900_audio->clk)) {
+                ret = PTR_ERR(nuc900_audio->clk);
+                goto out2;
+        }
+
+        nuc900_audio->irq_num = platform_get_irq(pdev, 0);
+        if (!nuc900_audio->irq_num) {
+                ret = -EBUSY;
+                goto out2;
+        }
+
+        nuc900_ac97_data = nuc900_audio;
+
+        nuc900_audio->dev = nuc900_ac97_dai.dev =  &pdev->dev;
+
+        ret = snd_soc_register_dai(&nuc900_ac97_dai);
+        if (ret)
+                goto out3;
+
+        mfp_set_groupg(nuc900_audio->dev); /* enbale ac97 multifunction pin*/
+
+        return 0;
+
+out3:
+        clk_put(nuc900_audio->clk);
+out2:
+        iounmap(nuc900_audio->mmio);
+out1:
+        release_mem_region(nuc900_audio->res->start,
+                                        resource_size(nuc900_audio->res));
+out0:
+        kfree(nuc900_audio);
+        return ret;
+}
+
+static int __devexit nuc900_ac97_drvremove(struct platform_device *pdev)
+{
+
+        snd_soc_unregister_dai(&nuc900_ac97_dai);
+
+        clk_put(nuc900_ac97_data->clk);
+        iounmap(nuc900_ac97_data->mmio);
+        release_mem_region(nuc900_ac97_data->res->start,
+                                resource_size(nuc900_ac97_data->res));
+
+        nuc900_ac97_data = NULL;
+
+        return 0;
+}
+
+static struct platform_driver nuc900_ac97_driver = {
+        .driver = {
+                .name   = "nuc900-audio",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = nuc900_ac97_drvprobe,
+        .remove         = __devexit_p(nuc900_ac97_drvremove),
+};
+
+static int __init nuc900_ac97_init(void)
+{
+        return platform_driver_register(&nuc900_ac97_driver);
+}
+
+static void __exit nuc900_ac97_exit(void)
+{
+        platform_driver_unregister(&nuc900_ac97_driver);
+}
+
+module_init(nuc900_ac97_init);
+module_exit(nuc900_ac97_exit);
+
+MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
+MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:nuc900-ac97");