ALSA: Add ALSA driver for Atmel AC97 controller
This patch adds ALSA support for the AC97 controller found on Atmel
AVR32 devices.
Tested on ATSTK1006 + ATSTK1000 with a development board with a AC97
codec.
Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c
new file mode 100644
index 0000000..dd72e00
--- /dev/null
+++ b/sound/atmel/ac97c.c
@@ -0,0 +1,932 @@
+/*
+ * Driver for the Atmel AC97C controller
+ *
+ * Copyright (C) 2005-2009 Atmel Corporation
+ *
+ * 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.
+ */
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/bitmap.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/ac97_codec.h>
+#include <sound/atmel-ac97c.h>
+#include <sound/memalloc.h>
+
+#include <linux/dw_dmac.h>
+
+#include "ac97c.h"
+
+enum {
+ DMA_TX_READY = 0,
+ DMA_RX_READY,
+ DMA_TX_CHAN_PRESENT,
+ DMA_RX_CHAN_PRESENT,
+};
+
+/* Serialize access to opened variable */
+static DEFINE_MUTEX(opened_mutex);
+
+struct atmel_ac97c_dma {
+ struct dma_chan *rx_chan;
+ struct dma_chan *tx_chan;
+};
+
+struct atmel_ac97c {
+ struct clk *pclk;
+ struct platform_device *pdev;
+ struct atmel_ac97c_dma dma;
+
+ struct snd_pcm_substream *playback_substream;
+ struct snd_pcm_substream *capture_substream;
+ struct snd_card *card;
+ struct snd_pcm *pcm;
+ struct snd_ac97 *ac97;
+ struct snd_ac97_bus *ac97_bus;
+
+ u64 cur_format;
+ unsigned int cur_rate;
+ unsigned long flags;
+ /* Serialize access to opened variable */
+ spinlock_t lock;
+ void __iomem *regs;
+ int opened;
+ int reset_pin;
+};
+
+#define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
+
+#define ac97c_writel(chip, reg, val) \
+ __raw_writel((val), (chip)->regs + AC97C_##reg)
+#define ac97c_readl(chip, reg) \
+ __raw_readl((chip)->regs + AC97C_##reg)
+
+/* This function is called by the DMA driver. */
+static void atmel_ac97c_dma_playback_period_done(void *arg)
+{
+ struct atmel_ac97c *chip = arg;
+ snd_pcm_period_elapsed(chip->playback_substream);
+}
+
+static void atmel_ac97c_dma_capture_period_done(void *arg)
+{
+ struct atmel_ac97c *chip = arg;
+ snd_pcm_period_elapsed(chip->capture_substream);
+}
+
+static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
+ struct snd_pcm_substream *substream,
+ enum dma_data_direction direction)
+{
+ struct dma_chan *chan;
+ struct dw_cyclic_desc *cdesc;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ unsigned long buffer_len, period_len;
+
+ /*
+ * We don't do DMA on "complex" transfers, i.e. with
+ * non-halfword-aligned buffers or lengths.
+ */
+ if (runtime->dma_addr & 1 || runtime->buffer_size & 1) {
+ dev_dbg(&chip->pdev->dev, "too complex transfer\n");
+ return -EINVAL;
+ }
+
+ if (direction == DMA_TO_DEVICE)
+ chan = chip->dma.tx_chan;
+ else
+ chan = chip->dma.rx_chan;
+
+ buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
+ period_len = frames_to_bytes(runtime, runtime->period_size);
+
+ cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len,
+ period_len, direction);
+ if (IS_ERR(cdesc)) {
+ dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n");
+ return PTR_ERR(cdesc);
+ }
+
+ if (direction == DMA_TO_DEVICE) {
+ cdesc->period_callback = atmel_ac97c_dma_playback_period_done;
+ set_bit(DMA_TX_READY, &chip->flags);
+ } else {
+ cdesc->period_callback = atmel_ac97c_dma_capture_period_done;
+ set_bit(DMA_RX_READY, &chip->flags);
+ }
+
+ cdesc->period_callback_param = chip;
+
+ return 0;
+}
+
+static struct snd_pcm_hardware atmel_ac97c_hw = {
+ .info = (SNDRV_PCM_INFO_MMAP
+ | SNDRV_PCM_INFO_MMAP_VALID
+ | SNDRV_PCM_INFO_INTERLEAVED
+ | SNDRV_PCM_INFO_BLOCK_TRANSFER
+ | SNDRV_PCM_INFO_JOINT_DUPLEX
+ | SNDRV_PCM_INFO_RESUME
+ | SNDRV_PCM_INFO_PAUSE),
+ .formats = (SNDRV_PCM_FMTBIT_S16_BE
+ | SNDRV_PCM_FMTBIT_S16_LE),
+ .rates = (SNDRV_PCM_RATE_CONTINUOUS),
+ .rate_min = 4000,
+ .rate_max = 48000,
+ .channels_min = 1,
+ .channels_max = 2,
+ .buffer_bytes_max = 64 * 4096,
+ .period_bytes_min = 4096,
+ .period_bytes_max = 4096,
+ .periods_min = 4,
+ .periods_max = 64,
+};
+
+static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ mutex_lock(&opened_mutex);
+ chip->opened++;
+ runtime->hw = atmel_ac97c_hw;
+ if (chip->cur_rate) {
+ runtime->hw.rate_min = chip->cur_rate;
+ runtime->hw.rate_max = chip->cur_rate;
+ }
+ if (chip->cur_format)
+ runtime->hw.formats = (1ULL << chip->cur_format);
+ mutex_unlock(&opened_mutex);
+ chip->playback_substream = substream;
+ return 0;
+}
+
+static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ mutex_lock(&opened_mutex);
+ chip->opened++;
+ runtime->hw = atmel_ac97c_hw;
+ if (chip->cur_rate) {
+ runtime->hw.rate_min = chip->cur_rate;
+ runtime->hw.rate_max = chip->cur_rate;
+ }
+ if (chip->cur_format)
+ runtime->hw.formats = (1ULL << chip->cur_format);
+ mutex_unlock(&opened_mutex);
+ chip->capture_substream = substream;
+ return 0;
+}
+
+static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+
+ mutex_lock(&opened_mutex);
+ chip->opened--;
+ if (!chip->opened) {
+ chip->cur_rate = 0;
+ chip->cur_format = 0;
+ }
+ mutex_unlock(&opened_mutex);
+
+ chip->playback_substream = NULL;
+
+ return 0;
+}
+
+static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+
+ mutex_lock(&opened_mutex);
+ chip->opened--;
+ if (!chip->opened) {
+ chip->cur_rate = 0;
+ chip->cur_format = 0;
+ }
+ mutex_unlock(&opened_mutex);
+
+ chip->capture_substream = NULL;
+
+ return 0;
+}
+
+static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+ int retval;
+
+ retval = snd_pcm_lib_malloc_pages(substream,
+ params_buffer_bytes(hw_params));
+ if (retval < 0)
+ return retval;
+ /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
+ if (retval == 1)
+ if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
+ dw_dma_cyclic_free(chip->dma.tx_chan);
+
+ /* Set restrictions to params. */
+ mutex_lock(&opened_mutex);
+ chip->cur_rate = params_rate(hw_params);
+ chip->cur_format = params_format(hw_params);
+ mutex_unlock(&opened_mutex);
+
+ return retval;
+}
+
+static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+ int retval;
+
+ retval = snd_pcm_lib_malloc_pages(substream,
+ params_buffer_bytes(hw_params));
+ if (retval < 0)
+ return retval;
+ /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
+ if (retval == 1)
+ if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
+ dw_dma_cyclic_free(chip->dma.rx_chan);
+
+ /* Set restrictions to params. */
+ mutex_lock(&opened_mutex);
+ chip->cur_rate = params_rate(hw_params);
+ chip->cur_format = params_format(hw_params);
+ mutex_unlock(&opened_mutex);
+
+ return retval;
+}
+
+static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+ if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
+ dw_dma_cyclic_free(chip->dma.tx_chan);
+ return snd_pcm_lib_free_pages(substream);
+}
+
+static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+ if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
+ dw_dma_cyclic_free(chip->dma.rx_chan);
+ return snd_pcm_lib_free_pages(substream);
+}
+
+static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ unsigned long word = 0;
+ int retval;
+
+ /* assign channels to AC97C channel A */
+ switch (runtime->channels) {
+ case 1:
+ word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
+ break;
+ case 2:
+ word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
+ | AC97C_CH_ASSIGN(PCM_RIGHT, A);
+ break;
+ default:
+ /* TODO: support more than two channels */
+ return -EINVAL;
+ break;
+ }
+ ac97c_writel(chip, OCA, word);
+
+ /* configure sample format and size */
+ word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
+
+ switch (runtime->format) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ word |= AC97C_CMR_CEM_LITTLE;
+ break;
+ case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
+ default:
+ word &= ~(AC97C_CMR_CEM_LITTLE);
+ break;
+ }
+
+ ac97c_writel(chip, CAMR, word);
+
+ /* set variable rate if needed */
+ if (runtime->rate != 48000) {
+ word = ac97c_readl(chip, MR);
+ word |= AC97C_MR_VRA;
+ ac97c_writel(chip, MR, word);
+ } else {
+ word = ac97c_readl(chip, MR);
+ word &= ~(AC97C_MR_VRA);
+ ac97c_writel(chip, MR, word);
+ }
+
+ retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
+ runtime->rate);
+ if (retval)
+ dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
+ runtime->rate);
+
+ if (!test_bit(DMA_TX_READY, &chip->flags))
+ retval = atmel_ac97c_prepare_dma(chip, substream,
+ DMA_TO_DEVICE);
+
+ return retval;
+}
+
+static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ unsigned long word = 0;
+ int retval;
+
+ /* assign channels to AC97C channel A */
+ switch (runtime->channels) {
+ case 1:
+ word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
+ break;
+ case 2:
+ word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
+ | AC97C_CH_ASSIGN(PCM_RIGHT, A);
+ break;
+ default:
+ /* TODO: support more than two channels */
+ return -EINVAL;
+ break;
+ }
+ ac97c_writel(chip, ICA, word);
+
+ /* configure sample format and size */
+ word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
+
+ switch (runtime->format) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ word |= AC97C_CMR_CEM_LITTLE;
+ break;
+ case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
+ default:
+ word &= ~(AC97C_CMR_CEM_LITTLE);
+ break;
+ }
+
+ ac97c_writel(chip, CAMR, word);
+
+ /* set variable rate if needed */
+ if (runtime->rate != 48000) {
+ word = ac97c_readl(chip, MR);
+ word |= AC97C_MR_VRA;
+ ac97c_writel(chip, MR, word);
+ } else {
+ word = ac97c_readl(chip, MR);
+ word &= ~(AC97C_MR_VRA);
+ ac97c_writel(chip, MR, word);
+ }
+
+ retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
+ runtime->rate);
+ if (retval)
+ dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
+ runtime->rate);
+
+ if (!test_bit(DMA_RX_READY, &chip->flags))
+ retval = atmel_ac97c_prepare_dma(chip, substream,
+ DMA_FROM_DEVICE);
+
+ return retval;
+}
+
+static int
+atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+ unsigned long camr;
+ int retval = 0;
+
+ camr = ac97c_readl(chip, CAMR);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
+ case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
+ case SNDRV_PCM_TRIGGER_START:
+ retval = dw_dma_cyclic_start(chip->dma.tx_chan);
+ if (retval)
+ goto out;
+ camr |= AC97C_CMR_CENA;
+ break;
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
+ case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
+ case SNDRV_PCM_TRIGGER_STOP:
+ dw_dma_cyclic_stop(chip->dma.tx_chan);
+ if (chip->opened <= 1)
+ camr &= ~AC97C_CMR_CENA;
+ break;
+ default:
+ retval = -EINVAL;
+ goto out;
+ }
+
+ ac97c_writel(chip, CAMR, camr);
+out:
+ return retval;
+}
+
+static int
+atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+ unsigned long camr;
+ int retval = 0;
+
+ camr = ac97c_readl(chip, CAMR);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
+ case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
+ case SNDRV_PCM_TRIGGER_START:
+ retval = dw_dma_cyclic_start(chip->dma.rx_chan);
+ if (retval)
+ goto out;
+ camr |= AC97C_CMR_CENA;
+ break;
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
+ case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
+ case SNDRV_PCM_TRIGGER_STOP:
+ dw_dma_cyclic_stop(chip->dma.rx_chan);
+ if (chip->opened <= 1)
+ camr &= ~AC97C_CMR_CENA;
+ break;
+ default:
+ retval = -EINVAL;
+ break;
+ }
+
+ ac97c_writel(chip, CAMR, camr);
+out:
+ return retval;
+}
+
+static snd_pcm_uframes_t
+atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_uframes_t frames;
+ unsigned long bytes;
+
+ bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
+ bytes -= runtime->dma_addr;
+
+ frames = bytes_to_frames(runtime, bytes);
+ if (frames >= runtime->buffer_size)
+ frames -= runtime->buffer_size;
+ return frames;
+}
+
+static snd_pcm_uframes_t
+atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
+{
+ struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_uframes_t frames;
+ unsigned long bytes;
+
+ bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
+ bytes -= runtime->dma_addr;
+
+ frames = bytes_to_frames(runtime, bytes);
+ if (frames >= runtime->buffer_size)
+ frames -= runtime->buffer_size;
+ return frames;
+}
+
+static struct snd_pcm_ops atmel_ac97_playback_ops = {
+ .open = atmel_ac97c_playback_open,
+ .close = atmel_ac97c_playback_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = atmel_ac97c_playback_hw_params,
+ .hw_free = atmel_ac97c_playback_hw_free,
+ .prepare = atmel_ac97c_playback_prepare,
+ .trigger = atmel_ac97c_playback_trigger,
+ .pointer = atmel_ac97c_playback_pointer,
+};
+
+static struct snd_pcm_ops atmel_ac97_capture_ops = {
+ .open = atmel_ac97c_capture_open,
+ .close = atmel_ac97c_capture_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = atmel_ac97c_capture_hw_params,
+ .hw_free = atmel_ac97c_capture_hw_free,
+ .prepare = atmel_ac97c_capture_prepare,
+ .trigger = atmel_ac97c_capture_trigger,
+ .pointer = atmel_ac97c_capture_pointer,
+};
+
+static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
+{
+ struct snd_pcm *pcm;
+ struct snd_pcm_hardware hw = atmel_ac97c_hw;
+ int capture, playback, retval;
+
+ capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+ playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
+
+ retval = snd_pcm_new(chip->card, chip->card->shortname,
+ chip->pdev->id, playback, capture, &pcm);
+ if (retval)
+ return retval;
+
+ if (capture)
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
+ &atmel_ac97_capture_ops);
+ if (playback)
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+ &atmel_ac97_playback_ops);
+
+ retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
+ &chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
+ hw.buffer_bytes_max);
+ if (retval)
+ return retval;
+
+ pcm->private_data = chip;
+ pcm->info_flags = 0;
+ strcpy(pcm->name, chip->card->shortname);
+ chip->pcm = pcm;
+
+ return 0;
+}
+
+static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
+{
+ struct snd_ac97_template template;
+ memset(&template, 0, sizeof(template));
+ template.private_data = chip;
+ return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
+}
+
+static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
+ unsigned short val)
+{
+ struct atmel_ac97c *chip = get_chip(ac97);
+ unsigned long word;
+ int timeout = 40;
+
+ word = (reg & 0x7f) << 16 | val;
+
+ do {
+ if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
+ ac97c_writel(chip, COTHR, word);
+ return;
+ }
+ udelay(1);
+ } while (--timeout);
+
+ dev_dbg(&chip->pdev->dev, "codec write timeout\n");
+}
+
+static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
+ unsigned short reg)
+{
+ struct atmel_ac97c *chip = get_chip(ac97);
+ unsigned long word;
+ int timeout = 40;
+ int write = 10;
+
+ word = (0x80 | (reg & 0x7f)) << 16;
+
+ if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
+ ac97c_readl(chip, CORHR);
+
+retry_write:
+ timeout = 40;
+
+ do {
+ if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
+ ac97c_writel(chip, COTHR, word);
+ goto read_reg;
+ }
+ udelay(10);
+ } while (--timeout);
+
+ if (!--write)
+ goto timed_out;
+ goto retry_write;
+
+read_reg:
+ do {
+ if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
+ unsigned short val = ac97c_readl(chip, CORHR);
+ return val;
+ }
+ udelay(10);
+ } while (--timeout);
+
+ if (!--write)
+ goto timed_out;
+ goto retry_write;
+
+timed_out:
+ dev_dbg(&chip->pdev->dev, "codec read timeout\n");
+ return 0xffff;
+}
+
+static bool filter(struct dma_chan *chan, void *slave)
+{
+ struct dw_dma_slave *dws = slave;
+
+ if (dws->dma_dev == chan->device->dev) {
+ chan->private = dws;
+ return true;
+ } else
+ return false;
+}
+
+static void atmel_ac97c_reset(struct atmel_ac97c *chip)
+{
+ ac97c_writel(chip, MR, AC97C_MR_WRST);
+
+ if (gpio_is_valid(chip->reset_pin)) {
+ gpio_set_value(chip->reset_pin, 0);
+ /* AC97 v2.2 specifications says minimum 1 us. */
+ udelay(10);
+ gpio_set_value(chip->reset_pin, 1);
+ }
+
+ udelay(1);
+ ac97c_writel(chip, MR, AC97C_MR_ENA);
+}
+
+static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
+{
+ struct snd_card *card;
+ struct atmel_ac97c *chip;
+ struct resource *regs;
+ struct ac97c_platform_data *pdata;
+ struct clk *pclk;
+ static struct snd_ac97_bus_ops ops = {
+ .write = atmel_ac97c_write,
+ .read = atmel_ac97c_read,
+ };
+ int retval;
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs) {
+ dev_dbg(&pdev->dev, "no memory resource\n");
+ return -ENXIO;
+ }
+
+ pdata = pdev->dev.platform_data;
+ if (!pdata) {
+ dev_dbg(&pdev->dev, "no platform data\n");
+ return -ENXIO;
+ }
+
+ pclk = clk_get(&pdev->dev, "pclk");
+ if (IS_ERR(pclk)) {
+ dev_dbg(&pdev->dev, "no peripheral clock\n");
+ return PTR_ERR(pclk);
+ }
+ clk_enable(pclk);
+
+ retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
+ THIS_MODULE, sizeof(struct atmel_ac97c), &card);
+ if (retval) {
+ dev_dbg(&pdev->dev, "could not create sound card device\n");
+ goto err_snd_card_new;
+ }
+
+ chip = get_chip(card);
+
+ spin_lock_init(&chip->lock);
+
+ strcpy(card->driver, "Atmel AC97C");
+ strcpy(card->shortname, "Atmel AC97C");
+ sprintf(card->longname, "Atmel AC97 controller");
+
+ chip->card = card;
+ chip->pclk = pclk;
+ chip->pdev = pdev;
+ chip->regs = ioremap(regs->start, regs->end - regs->start + 1);
+
+ if (!chip->regs) {
+ dev_dbg(&pdev->dev, "could not remap register memory\n");
+ goto err_ioremap;
+ }
+
+ if (gpio_is_valid(pdata->reset_pin)) {
+ if (gpio_request(pdata->reset_pin, "reset_pin")) {
+ dev_dbg(&pdev->dev, "reset pin not available\n");
+ chip->reset_pin = -ENODEV;
+ } else {
+ gpio_direction_output(pdata->reset_pin, 1);
+ chip->reset_pin = pdata->reset_pin;
+ }
+ }
+
+ snd_card_set_dev(card, &pdev->dev);
+
+ retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
+ if (retval) {
+ dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
+ goto err_ac97_bus;
+ }
+
+ atmel_ac97c_reset(chip);
+
+ retval = atmel_ac97c_mixer_new(chip);
+ if (retval) {
+ dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
+ goto err_ac97_bus;
+ }
+
+ if (pdata->rx_dws.dma_dev) {
+ struct dw_dma_slave *dws = &pdata->rx_dws;
+ dma_cap_mask_t mask;
+
+ dws->rx_reg = regs->start + AC97C_CARHR + 2;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ chip->dma.rx_chan = dma_request_channel(mask, filter, dws);
+
+ dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
+ chip->dma.rx_chan->dev->device.bus_id);
+ set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+ }
+
+ if (pdata->tx_dws.dma_dev) {
+ struct dw_dma_slave *dws = &pdata->tx_dws;
+ dma_cap_mask_t mask;
+
+ dws->tx_reg = regs->start + AC97C_CATHR + 2;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ chip->dma.tx_chan = dma_request_channel(mask, filter, dws);
+
+ dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
+ chip->dma.tx_chan->dev->device.bus_id);
+ set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
+ }
+
+ if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
+ !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
+ dev_dbg(&pdev->dev, "DMA not available\n");
+ retval = -ENODEV;
+ goto err_dma;
+ }
+
+ retval = atmel_ac97c_pcm_new(chip);
+ if (retval) {
+ dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
+ goto err_dma;
+ }
+
+ retval = snd_card_register(card);
+ if (retval) {
+ dev_dbg(&pdev->dev, "could not register sound card\n");
+ goto err_ac97_bus;
+ }
+
+ platform_set_drvdata(pdev, card);
+
+ dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p\n",
+ chip->regs);
+
+ return 0;
+
+err_dma:
+ if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
+ dma_release_channel(chip->dma.rx_chan);
+ if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
+ dma_release_channel(chip->dma.tx_chan);
+ clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+ clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
+ chip->dma.rx_chan = NULL;
+ chip->dma.tx_chan = NULL;
+err_ac97_bus:
+ snd_card_set_dev(card, NULL);
+
+ if (gpio_is_valid(chip->reset_pin))
+ gpio_free(chip->reset_pin);
+
+ iounmap(chip->regs);
+err_ioremap:
+ snd_card_free(card);
+err_snd_card_new:
+ clk_disable(pclk);
+ clk_put(pclk);
+ return retval;
+}
+
+#ifdef CONFIG_PM
+static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg)
+{
+ struct snd_card *card = platform_get_drvdata(pdev);
+ struct atmel_ac97c *chip = card->private_data;
+
+ if (test_bit(DMA_RX_READY, &chip->flags))
+ dw_dma_cyclic_stop(chip->dma.rx_chan);
+ if (test_bit(DMA_TX_READY, &chip->flags))
+ dw_dma_cyclic_stop(chip->dma.tx_chan);
+ clk_disable(chip->pclk);
+
+ return 0;
+}
+
+static int atmel_ac97c_resume(struct platform_device *pdev)
+{
+ struct snd_card *card = platform_get_drvdata(pdev);
+ struct atmel_ac97c *chip = card->private_data;
+
+ clk_enable(chip->pclk);
+ if (test_bit(DMA_RX_READY, &chip->flags))
+ dw_dma_cyclic_start(chip->dma.rx_chan);
+ if (test_bit(DMA_TX_READY, &chip->flags))
+ dw_dma_cyclic_start(chip->dma.tx_chan);
+
+ return 0;
+}
+#else
+#define atmel_ac97c_suspend NULL
+#define atmel_ac97c_resume NULL
+#endif
+
+static int __devexit atmel_ac97c_remove(struct platform_device *pdev)
+{
+ struct snd_card *card = platform_get_drvdata(pdev);
+ struct atmel_ac97c *chip = get_chip(card);
+
+ if (gpio_is_valid(chip->reset_pin))
+ gpio_free(chip->reset_pin);
+
+ clk_disable(chip->pclk);
+ clk_put(chip->pclk);
+ iounmap(chip->regs);
+
+ if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
+ dma_release_channel(chip->dma.rx_chan);
+ if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
+ dma_release_channel(chip->dma.tx_chan);
+ clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+ clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
+ chip->dma.rx_chan = NULL;
+ chip->dma.tx_chan = NULL;
+
+ snd_card_set_dev(card, NULL);
+ snd_card_free(card);
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver atmel_ac97c_driver = {
+ .remove = __devexit_p(atmel_ac97c_remove),
+ .driver = {
+ .name = "atmel_ac97c",
+ },
+ .suspend = atmel_ac97c_suspend,
+ .resume = atmel_ac97c_resume,
+};
+
+static int __init atmel_ac97c_init(void)
+{
+ return platform_driver_probe(&atmel_ac97c_driver,
+ atmel_ac97c_probe);
+}
+module_init(atmel_ac97c_init);
+
+static void __exit atmel_ac97c_exit(void)
+{
+ platform_driver_unregister(&atmel_ac97c_driver);
+}
+module_exit(atmel_ac97c_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
+MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>");