--- /dev/null
+/*
+ * 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/clk.h>
+
+#include <mach/mfp.h>
+
+#include "nuc900-audio.h"
+
+static DEFINE_MUTEX(ac97_mutex);
+struct nuc900_audio *nuc900_ac97_data;
+EXPORT_SYMBOL_GPL(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 */
+static struct snd_ac97_bus_ops nuc900_ac97_ops = {
+ .read = nuc900_ac97_read,
+ .write = nuc900_ac97_write,
+ .reset = nuc900_ac97_cold_reset,
+ .warm_reset = nuc900_ac97_warm_reset,
+};
+
+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 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 int nuc900_ac97_remove(struct snd_soc_dai *dai)
+{
+ struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+
+ clk_disable(nuc900_audio->clk);
+ return 0;
+}
+
+static const struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
+ .trigger = nuc900_ac97_trigger,
+};
+
+static struct snd_soc_dai_driver nuc900_ac97_dai = {
+ .probe = nuc900_ac97_probe,
+ .remove = nuc900_ac97_remove,
+ .bus_control = true,
+ .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,
+};
+
+static const struct snd_soc_component_driver nuc900_ac97_component = {
+ .name = "nuc900-ac97",
+};
+
+static int nuc900_ac97_drvprobe(struct platform_device *pdev)
+{
+ struct nuc900_audio *nuc900_audio;
+ int ret;
+
+ if (nuc900_ac97_data)
+ return -EBUSY;
+
+ nuc900_audio = devm_kzalloc(&pdev->dev, 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);
+ nuc900_audio->mmio = devm_ioremap_resource(&pdev->dev,
+ nuc900_audio->res);
+ if (IS_ERR(nuc900_audio->mmio))
+ return PTR_ERR(nuc900_audio->mmio);
+
+ nuc900_audio->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(nuc900_audio->clk)) {
+ ret = PTR_ERR(nuc900_audio->clk);
+ goto out;
+ }
+
+ nuc900_audio->irq_num = platform_get_irq(pdev, 0);
+ if (!nuc900_audio->irq_num) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ nuc900_ac97_data = nuc900_audio;
+
+ ret = snd_soc_set_ac97_ops(&nuc900_ac97_ops);
+ if (ret)
+ goto out;
+
+ ret = snd_soc_register_component(&pdev->dev, &nuc900_ac97_component,
+ &nuc900_ac97_dai, 1);
+ if (ret)
+ goto out;
+
+ /* enbale ac97 multifunction pin */
+ mfp_set_groupg(nuc900_audio->dev, NULL);
+
+ return 0;
+
+out:
+ snd_soc_set_ac97_ops(NULL);
+ return ret;
+}
+
+static int nuc900_ac97_drvremove(struct platform_device *pdev)
+{
+ snd_soc_unregister_component(&pdev->dev);
+
+ nuc900_ac97_data = NULL;
+ snd_soc_set_ac97_ops(NULL);
+
+ return 0;
+}
+
+static struct platform_driver nuc900_ac97_driver = {
+ .driver = {
+ .name = "nuc900-ac97",
+ },
+ .probe = nuc900_ac97_drvprobe,
+ .remove = nuc900_ac97_drvremove,
+};
+
+module_platform_driver(nuc900_ac97_driver);
+
+MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
+MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:nuc900-ac97");
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