ALSA: Add ALSA driver for Atmel AC97 controller
Hans-Christian Egtvedt [Thu, 5 Feb 2009 12:11:00 +0000 (13:11 +0100)]
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>

include/sound/atmel-ac97c.h [new file with mode: 0644]
sound/atmel/Kconfig
sound/atmel/Makefile
sound/atmel/ac97c.c [new file with mode: 0644]
sound/atmel/ac97c.h [new file with mode: 0644]

diff --git a/include/sound/atmel-ac97c.h b/include/sound/atmel-ac97c.h
new file mode 100644 (file)
index 0000000..e6aabdb
--- /dev/null
@@ -0,0 +1,40 @@
+/*
+ * 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.
+ */
+#ifndef __INCLUDE_SOUND_ATMEL_AC97C_H
+#define __INCLUDE_SOUND_ATMEL_AC97C_H
+
+#include <linux/dw_dmac.h>
+
+#define AC97C_CAPTURE  0x01
+#define AC97C_PLAYBACK 0x02
+#define AC97C_BOTH     (AC97C_CAPTURE | AC97C_PLAYBACK)
+
+/**
+ * struct atmel_ac97c_pdata - board specific AC97C configuration
+ * @rx_dws: DMA slave interface to use for sound capture.
+ * @tx_dws: DMA slave interface to use for sound playback.
+ * @reset_pin: GPIO pin wired to the reset input on the external AC97 codec,
+ *             optional to use, set to -ENODEV if not in use. AC97 layer will
+ *             try to do a software reset of the external codec anyway.
+ * @flags: Flags for which directions should be enabled.
+ *
+ * If the user do not want to use a DMA channel for playback or capture, i.e.
+ * only one feature is required on the board. The slave for playback or capture
+ * can be set to NULL. The AC97C driver will take use of this when setting up
+ * the sound streams.
+ */
+struct ac97c_platform_data {
+       struct dw_dma_slave     rx_dws;
+       struct dw_dma_slave     tx_dws;
+       unsigned int            flags;
+       int                     reset_pin;
+};
+
+#endif /* __INCLUDE_SOUND_ATMEL_AC97C_H */
index 715318e..6c228a9 100644 (file)
@@ -8,4 +8,12 @@ config SND_ATMEL_ABDAC
        help
          ALSA sound driver for the Atmel Audio Bitstream DAC (ABDAC).
 
+config SND_ATMEL_AC97C
+       tristate "Atmel AC97 Controller (AC97C) driver"
+       select SND_PCM
+       select SND_AC97_CODEC
+       depends on DW_DMAC && AVR32
+       help
+         ALSA sound driver for the Atmel AC97 controller.
+
 endmenu
index c5a8213..219dcfa 100644 (file)
@@ -1,3 +1,5 @@
 snd-atmel-abdac-objs           := abdac.o
+snd-atmel-ac97c-objs           := ac97c.o
 
 obj-$(CONFIG_SND_ATMEL_ABDAC)  += snd-atmel-abdac.o
+obj-$(CONFIG_SND_ATMEL_AC97C)  += snd-atmel-ac97c.o
diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c
new file mode 100644 (file)
index 0000000..dd72e00
--- /dev/null
@@ -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>");
diff --git a/sound/atmel/ac97c.h b/sound/atmel/ac97c.h
new file mode 100644 (file)
index 0000000..c17bd58
--- /dev/null
@@ -0,0 +1,71 @@
+/*
+ * Register definitions 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.
+ */
+#ifndef __SOUND_ATMEL_AC97C_H
+#define __SOUND_ATMEL_AC97C_H
+
+#define AC97C_MR               0x08
+#define AC97C_ICA              0x10
+#define AC97C_OCA              0x14
+#define AC97C_CARHR            0x20
+#define AC97C_CATHR            0x24
+#define AC97C_CASR             0x28
+#define AC97C_CAMR             0x2c
+#define AC97C_CBRHR            0x30
+#define AC97C_CBTHR            0x34
+#define AC97C_CBSR             0x38
+#define AC97C_CBMR             0x3c
+#define AC97C_CORHR            0x40
+#define AC97C_COTHR            0x44
+#define AC97C_COSR             0x48
+#define AC97C_COMR             0x4c
+#define AC97C_SR               0x50
+#define AC97C_IER              0x54
+#define AC97C_IDR              0x58
+#define AC97C_IMR              0x5c
+#define AC97C_VERSION          0xfc
+
+#define AC97C_CATPR            PDC_TPR
+#define AC97C_CATCR            PDC_TCR
+#define AC97C_CATNPR           PDC_TNPR
+#define AC97C_CATNCR           PDC_TNCR
+#define AC97C_CARPR            PDC_RPR
+#define AC97C_CARCR            PDC_RCR
+#define AC97C_CARNPR           PDC_RNPR
+#define AC97C_CARNCR           PDC_RNCR
+#define AC97C_PTCR             PDC_PTCR
+
+#define AC97C_MR_ENA           (1 << 0)
+#define AC97C_MR_WRST          (1 << 1)
+#define AC97C_MR_VRA           (1 << 2)
+
+#define AC97C_CSR_TXRDY                (1 << 0)
+#define AC97C_CSR_UNRUN                (1 << 2)
+#define AC97C_CSR_RXRDY                (1 << 4)
+#define AC97C_CSR_ENDTX                (1 << 10)
+#define AC97C_CSR_ENDRX                (1 << 14)
+
+#define AC97C_CMR_SIZE_20      (0 << 16)
+#define AC97C_CMR_SIZE_18      (1 << 16)
+#define AC97C_CMR_SIZE_16      (2 << 16)
+#define AC97C_CMR_SIZE_10      (3 << 16)
+#define AC97C_CMR_CEM_LITTLE   (1 << 18)
+#define AC97C_CMR_CEM_BIG      (0 << 18)
+#define AC97C_CMR_CENA         (1 << 21)
+#define AC97C_CMR_DMAEN                (1 << 22)
+
+#define AC97C_SR_CAEVT         (1 << 3)
+
+#define AC97C_CH_ASSIGN(slot, channel)                                 \
+       (AC97C_CHANNEL_##channel << (3 * (AC97_SLOT_##slot - 3)))
+#define AC97C_CHANNEL_NONE     0x0
+#define AC97C_CHANNEL_A                0x1
+#define AC97C_CHANNEL_B                0x2
+
+#endif /* __SOUND_ATMEL_AC97C_H */