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* Driver for Atmel AC97C
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* Copyright (C) 2005-2009 Atmel Corporation
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/bitmap.h>
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#include <linux/device.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/atmel_pdc.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include <linux/gpio.h>
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#include <sound/core.h>
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#include <sound/initval.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/ac97_codec.h>
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#include <sound/atmel-ac97c.h>
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#include <sound/memalloc.h>
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#include <linux/dw_dmac.h>
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#include <mach/gpio.h>
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#ifdef CONFIG_ARCH_AT91
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#include <mach/hardware.h>
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/* Serialize access to opened variable */
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static DEFINE_MUTEX(opened_mutex);
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struct atmel_ac97c_dma {
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struct dma_chan *rx_chan;
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struct dma_chan *tx_chan;
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struct platform_device *pdev;
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struct atmel_ac97c_dma dma;
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struct snd_pcm_substream *playback_substream;
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struct snd_pcm_substream *capture_substream;
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struct snd_card *card;
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struct snd_ac97 *ac97;
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struct snd_ac97_bus *ac97_bus;
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unsigned int cur_rate;
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int playback_period, capture_period;
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/* Serialize access to opened variable */
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#define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
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#define ac97c_writel(chip, reg, val) \
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__raw_writel((val), (chip)->regs + AC97C_##reg)
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#define ac97c_readl(chip, reg) \
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__raw_readl((chip)->regs + AC97C_##reg)
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/* This function is called by the DMA driver. */
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static void atmel_ac97c_dma_playback_period_done(void *arg)
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struct atmel_ac97c *chip = arg;
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snd_pcm_period_elapsed(chip->playback_substream);
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static void atmel_ac97c_dma_capture_period_done(void *arg)
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struct atmel_ac97c *chip = arg;
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snd_pcm_period_elapsed(chip->capture_substream);
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static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
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struct snd_pcm_substream *substream,
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enum dma_data_direction direction)
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struct dma_chan *chan;
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struct dw_cyclic_desc *cdesc;
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struct snd_pcm_runtime *runtime = substream->runtime;
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unsigned long buffer_len, period_len;
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* We don't do DMA on "complex" transfers, i.e. with
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* non-halfword-aligned buffers or lengths.
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if (runtime->dma_addr & 1 || runtime->buffer_size & 1) {
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dev_dbg(&chip->pdev->dev, "too complex transfer\n");
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if (direction == DMA_TO_DEVICE)
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chan = chip->dma.tx_chan;
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chan = chip->dma.rx_chan;
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buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
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period_len = frames_to_bytes(runtime, runtime->period_size);
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cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len,
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period_len, direction);
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dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n");
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return PTR_ERR(cdesc);
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if (direction == DMA_TO_DEVICE) {
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cdesc->period_callback = atmel_ac97c_dma_playback_period_done;
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set_bit(DMA_TX_READY, &chip->flags);
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cdesc->period_callback = atmel_ac97c_dma_capture_period_done;
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set_bit(DMA_RX_READY, &chip->flags);
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cdesc->period_callback_param = chip;
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static struct snd_pcm_hardware atmel_ac97c_hw = {
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.info = (SNDRV_PCM_INFO_MMAP
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| SNDRV_PCM_INFO_MMAP_VALID
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| SNDRV_PCM_INFO_INTERLEAVED
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| SNDRV_PCM_INFO_BLOCK_TRANSFER
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| SNDRV_PCM_INFO_JOINT_DUPLEX
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| SNDRV_PCM_INFO_RESUME
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| SNDRV_PCM_INFO_PAUSE),
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.formats = (SNDRV_PCM_FMTBIT_S16_BE
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| SNDRV_PCM_FMTBIT_S16_LE),
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.rates = (SNDRV_PCM_RATE_CONTINUOUS),
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.buffer_bytes_max = 2 * 2 * 64 * 2048,
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.period_bytes_min = 4096,
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.period_bytes_max = 4096,
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static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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mutex_lock(&opened_mutex);
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runtime->hw = atmel_ac97c_hw;
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if (chip->cur_rate) {
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runtime->hw.rate_min = chip->cur_rate;
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runtime->hw.rate_max = chip->cur_rate;
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if (chip->cur_format)
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runtime->hw.formats = (1ULL << chip->cur_format);
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mutex_unlock(&opened_mutex);
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chip->playback_substream = substream;
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static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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mutex_lock(&opened_mutex);
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runtime->hw = atmel_ac97c_hw;
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if (chip->cur_rate) {
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runtime->hw.rate_min = chip->cur_rate;
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runtime->hw.rate_max = chip->cur_rate;
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if (chip->cur_format)
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runtime->hw.formats = (1ULL << chip->cur_format);
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mutex_unlock(&opened_mutex);
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chip->capture_substream = substream;
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static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
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mutex_lock(&opened_mutex);
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chip->cur_format = 0;
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mutex_unlock(&opened_mutex);
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chip->playback_substream = NULL;
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static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
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mutex_lock(&opened_mutex);
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chip->cur_format = 0;
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mutex_unlock(&opened_mutex);
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chip->capture_substream = NULL;
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static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
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retval = snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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/* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
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if (cpu_is_at32ap7000()) {
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/* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
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if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
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dw_dma_cyclic_free(chip->dma.tx_chan);
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/* Set restrictions to params. */
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mutex_lock(&opened_mutex);
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chip->cur_rate = params_rate(hw_params);
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chip->cur_format = params_format(hw_params);
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mutex_unlock(&opened_mutex);
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static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
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retval = snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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/* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
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if (cpu_is_at32ap7000()) {
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/* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
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if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
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dw_dma_cyclic_free(chip->dma.rx_chan);
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/* Set restrictions to params. */
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mutex_lock(&opened_mutex);
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chip->cur_rate = params_rate(hw_params);
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chip->cur_format = params_format(hw_params);
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mutex_unlock(&opened_mutex);
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static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
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if (cpu_is_at32ap7000()) {
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if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
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dw_dma_cyclic_free(chip->dma.tx_chan);
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return snd_pcm_lib_free_pages(substream);
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static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
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if (cpu_is_at32ap7000()) {
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if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
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dw_dma_cyclic_free(chip->dma.rx_chan);
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return snd_pcm_lib_free_pages(substream);
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static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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int block_size = frames_to_bytes(runtime, runtime->period_size);
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unsigned long word = ac97c_readl(chip, OCA);
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chip->playback_period = 0;
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word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
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/* assign channels to AC97C channel A */
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switch (runtime->channels) {
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word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
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word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
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| AC97C_CH_ASSIGN(PCM_RIGHT, A);
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/* TODO: support more than two channels */
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ac97c_writel(chip, OCA, word);
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/* configure sample format and size */
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word = ac97c_readl(chip, CAMR);
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if (chip->opened <= 1)
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word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
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word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
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switch (runtime->format) {
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case SNDRV_PCM_FORMAT_S16_LE:
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if (cpu_is_at32ap7000())
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word |= AC97C_CMR_CEM_LITTLE;
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case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
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word &= ~(AC97C_CMR_CEM_LITTLE);
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word = ac97c_readl(chip, OCA);
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word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
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ac97c_writel(chip, OCA, word);
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/* Enable underrun interrupt on channel A */
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word |= AC97C_CSR_UNRUN;
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ac97c_writel(chip, CAMR, word);
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/* Enable channel A event interrupt */
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word = ac97c_readl(chip, IMR);
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word |= AC97C_SR_CAEVT;
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ac97c_writel(chip, IER, word);
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/* set variable rate if needed */
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if (runtime->rate != 48000) {
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word = ac97c_readl(chip, MR);
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word |= AC97C_MR_VRA;
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ac97c_writel(chip, MR, word);
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word = ac97c_readl(chip, MR);
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word &= ~(AC97C_MR_VRA);
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ac97c_writel(chip, MR, word);
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retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
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dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
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if (cpu_is_at32ap7000()) {
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if (!test_bit(DMA_TX_READY, &chip->flags))
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retval = atmel_ac97c_prepare_dma(chip, substream,
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/* Initialize and start the PDC */
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writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
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writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
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writel(runtime->dma_addr + block_size,
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chip->regs + ATMEL_PDC_TNPR);
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writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
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static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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int block_size = frames_to_bytes(runtime, runtime->period_size);
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unsigned long word = ac97c_readl(chip, ICA);
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chip->capture_period = 0;
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word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
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/* assign channels to AC97C channel A */
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switch (runtime->channels) {
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word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
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word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
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| AC97C_CH_ASSIGN(PCM_RIGHT, A);
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/* TODO: support more than two channels */
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ac97c_writel(chip, ICA, word);
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/* configure sample format and size */
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word = ac97c_readl(chip, CAMR);
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if (chip->opened <= 1)
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word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
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word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
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switch (runtime->format) {
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case SNDRV_PCM_FORMAT_S16_LE:
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if (cpu_is_at32ap7000())
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word |= AC97C_CMR_CEM_LITTLE;
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case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
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word &= ~(AC97C_CMR_CEM_LITTLE);
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word = ac97c_readl(chip, ICA);
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word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
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ac97c_writel(chip, ICA, word);
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/* Enable overrun interrupt on channel A */
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word |= AC97C_CSR_OVRUN;
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ac97c_writel(chip, CAMR, word);
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/* Enable channel A event interrupt */
463
word = ac97c_readl(chip, IMR);
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word |= AC97C_SR_CAEVT;
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ac97c_writel(chip, IER, word);
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/* set variable rate if needed */
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if (runtime->rate != 48000) {
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word = ac97c_readl(chip, MR);
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word |= AC97C_MR_VRA;
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ac97c_writel(chip, MR, word);
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word = ac97c_readl(chip, MR);
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word &= ~(AC97C_MR_VRA);
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ac97c_writel(chip, MR, word);
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retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
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dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
484
if (cpu_is_at32ap7000()) {
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if (!test_bit(DMA_RX_READY, &chip->flags))
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retval = atmel_ac97c_prepare_dma(chip, substream,
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/* Initialize and start the PDC */
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writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
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writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
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writel(runtime->dma_addr + block_size,
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chip->regs + ATMEL_PDC_RNPR);
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writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
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atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
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unsigned long camr, ptcr = 0;
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camr = ac97c_readl(chip, CAMR);
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
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case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
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case SNDRV_PCM_TRIGGER_START:
513
if (cpu_is_at32ap7000()) {
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retval = dw_dma_cyclic_start(chip->dma.tx_chan);
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ptcr = ATMEL_PDC_TXTEN;
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camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
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case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
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case SNDRV_PCM_TRIGGER_STOP:
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if (cpu_is_at32ap7000())
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dw_dma_cyclic_stop(chip->dma.tx_chan);
528
ptcr |= ATMEL_PDC_TXTDIS;
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if (chip->opened <= 1)
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camr &= ~AC97C_CMR_CENA;
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ac97c_writel(chip, CAMR, camr);
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if (!cpu_is_at32ap7000())
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writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
545
atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
547
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
548
unsigned long camr, ptcr = 0;
551
camr = ac97c_readl(chip, CAMR);
552
ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
555
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
556
case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
557
case SNDRV_PCM_TRIGGER_START:
558
if (cpu_is_at32ap7000()) {
559
retval = dw_dma_cyclic_start(chip->dma.rx_chan);
563
ptcr = ATMEL_PDC_RXTEN;
565
camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
567
case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
568
case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
569
case SNDRV_PCM_TRIGGER_STOP:
570
if (cpu_is_at32ap7000())
571
dw_dma_cyclic_stop(chip->dma.rx_chan);
573
ptcr |= (ATMEL_PDC_RXTDIS);
574
if (chip->opened <= 1)
575
camr &= ~AC97C_CMR_CENA;
582
ac97c_writel(chip, CAMR, camr);
583
if (!cpu_is_at32ap7000())
584
writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
589
static snd_pcm_uframes_t
590
atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
592
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
593
struct snd_pcm_runtime *runtime = substream->runtime;
594
snd_pcm_uframes_t frames;
597
if (cpu_is_at32ap7000())
598
bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
600
bytes = readl(chip->regs + ATMEL_PDC_TPR);
601
bytes -= runtime->dma_addr;
603
frames = bytes_to_frames(runtime, bytes);
604
if (frames >= runtime->buffer_size)
605
frames -= runtime->buffer_size;
609
static snd_pcm_uframes_t
610
atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
612
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
613
struct snd_pcm_runtime *runtime = substream->runtime;
614
snd_pcm_uframes_t frames;
617
if (cpu_is_at32ap7000())
618
bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
620
bytes = readl(chip->regs + ATMEL_PDC_RPR);
621
bytes -= runtime->dma_addr;
623
frames = bytes_to_frames(runtime, bytes);
624
if (frames >= runtime->buffer_size)
625
frames -= runtime->buffer_size;
629
static struct snd_pcm_ops atmel_ac97_playback_ops = {
630
.open = atmel_ac97c_playback_open,
631
.close = atmel_ac97c_playback_close,
632
.ioctl = snd_pcm_lib_ioctl,
633
.hw_params = atmel_ac97c_playback_hw_params,
634
.hw_free = atmel_ac97c_playback_hw_free,
635
.prepare = atmel_ac97c_playback_prepare,
636
.trigger = atmel_ac97c_playback_trigger,
637
.pointer = atmel_ac97c_playback_pointer,
640
static struct snd_pcm_ops atmel_ac97_capture_ops = {
641
.open = atmel_ac97c_capture_open,
642
.close = atmel_ac97c_capture_close,
643
.ioctl = snd_pcm_lib_ioctl,
644
.hw_params = atmel_ac97c_capture_hw_params,
645
.hw_free = atmel_ac97c_capture_hw_free,
646
.prepare = atmel_ac97c_capture_prepare,
647
.trigger = atmel_ac97c_capture_trigger,
648
.pointer = atmel_ac97c_capture_pointer,
651
static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
653
struct atmel_ac97c *chip = (struct atmel_ac97c *)dev;
654
irqreturn_t retval = IRQ_NONE;
655
u32 sr = ac97c_readl(chip, SR);
656
u32 casr = ac97c_readl(chip, CASR);
657
u32 cosr = ac97c_readl(chip, COSR);
658
u32 camr = ac97c_readl(chip, CAMR);
660
if (sr & AC97C_SR_CAEVT) {
661
struct snd_pcm_runtime *runtime;
662
int offset, next_period, block_size;
663
dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
664
casr & AC97C_CSR_OVRUN ? " OVRUN" : "",
665
casr & AC97C_CSR_RXRDY ? " RXRDY" : "",
666
casr & AC97C_CSR_UNRUN ? " UNRUN" : "",
667
casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
668
casr & AC97C_CSR_TXRDY ? " TXRDY" : "",
669
!casr ? " NONE" : "");
670
if (!cpu_is_at32ap7000()) {
671
if ((casr & camr) & AC97C_CSR_ENDTX) {
672
runtime = chip->playback_substream->runtime;
673
block_size = frames_to_bytes(runtime,
674
runtime->period_size);
675
chip->playback_period++;
677
if (chip->playback_period == runtime->periods)
678
chip->playback_period = 0;
679
next_period = chip->playback_period + 1;
680
if (next_period == runtime->periods)
683
offset = block_size * next_period;
685
writel(runtime->dma_addr + offset,
686
chip->regs + ATMEL_PDC_TNPR);
687
writel(block_size / 2,
688
chip->regs + ATMEL_PDC_TNCR);
690
snd_pcm_period_elapsed(
691
chip->playback_substream);
693
if ((casr & camr) & AC97C_CSR_ENDRX) {
694
runtime = chip->capture_substream->runtime;
695
block_size = frames_to_bytes(runtime,
696
runtime->period_size);
697
chip->capture_period++;
699
if (chip->capture_period == runtime->periods)
700
chip->capture_period = 0;
701
next_period = chip->capture_period + 1;
702
if (next_period == runtime->periods)
705
offset = block_size * next_period;
707
writel(runtime->dma_addr + offset,
708
chip->regs + ATMEL_PDC_RNPR);
709
writel(block_size / 2,
710
chip->regs + ATMEL_PDC_RNCR);
711
snd_pcm_period_elapsed(chip->capture_substream);
714
retval = IRQ_HANDLED;
717
if (sr & AC97C_SR_COEVT) {
718
dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
719
cosr & AC97C_CSR_OVRUN ? " OVRUN" : "",
720
cosr & AC97C_CSR_RXRDY ? " RXRDY" : "",
721
cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
722
cosr & AC97C_CSR_TXRDY ? " TXRDY" : "",
723
!cosr ? " NONE" : "");
724
retval = IRQ_HANDLED;
727
if (retval == IRQ_NONE) {
728
dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
729
"casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
735
static struct ac97_pcm at91_ac97_pcm_defs[] __devinitdata = {
740
.slots = ((1 << AC97_SLOT_PCM_LEFT)
741
| (1 << AC97_SLOT_PCM_RIGHT)),
749
.slots = ((1 << AC97_SLOT_PCM_LEFT)
750
| (1 << AC97_SLOT_PCM_RIGHT)),
758
.slots = (1<<AC97_SLOT_MIC),
763
static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
766
struct snd_pcm_hardware hw = atmel_ac97c_hw;
767
int capture, playback, retval, err;
769
capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
770
playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
772
if (!cpu_is_at32ap7000()) {
773
err = snd_ac97_pcm_assign(chip->ac97_bus,
774
ARRAY_SIZE(at91_ac97_pcm_defs),
779
retval = snd_pcm_new(chip->card, chip->card->shortname,
780
chip->pdev->id, playback, capture, &pcm);
785
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
786
&atmel_ac97_capture_ops);
788
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
789
&atmel_ac97_playback_ops);
791
retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
792
&chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
793
hw.buffer_bytes_max);
797
pcm->private_data = chip;
799
strcpy(pcm->name, chip->card->shortname);
805
static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
807
struct snd_ac97_template template;
808
memset(&template, 0, sizeof(template));
809
template.private_data = chip;
810
return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
813
static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
816
struct atmel_ac97c *chip = get_chip(ac97);
820
word = (reg & 0x7f) << 16 | val;
823
if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
824
ac97c_writel(chip, COTHR, word);
830
dev_dbg(&chip->pdev->dev, "codec write timeout\n");
833
static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
836
struct atmel_ac97c *chip = get_chip(ac97);
841
word = (0x80 | (reg & 0x7f)) << 16;
843
if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
844
ac97c_readl(chip, CORHR);
850
if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
851
ac97c_writel(chip, COTHR, word);
863
if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
864
unsigned short val = ac97c_readl(chip, CORHR);
875
dev_dbg(&chip->pdev->dev, "codec read timeout\n");
879
static bool filter(struct dma_chan *chan, void *slave)
881
struct dw_dma_slave *dws = slave;
883
if (dws->dma_dev == chan->device->dev) {
890
static void atmel_ac97c_reset(struct atmel_ac97c *chip)
892
ac97c_writel(chip, MR, 0);
893
ac97c_writel(chip, MR, AC97C_MR_ENA);
894
ac97c_writel(chip, CAMR, 0);
895
ac97c_writel(chip, COMR, 0);
897
if (gpio_is_valid(chip->reset_pin)) {
898
gpio_set_value(chip->reset_pin, 0);
899
/* AC97 v2.2 specifications says minimum 1 us. */
901
gpio_set_value(chip->reset_pin, 1);
903
ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
905
ac97c_writel(chip, MR, AC97C_MR_ENA);
909
static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
911
struct snd_card *card;
912
struct atmel_ac97c *chip;
913
struct resource *regs;
914
struct ac97c_platform_data *pdata;
916
static struct snd_ac97_bus_ops ops = {
917
.write = atmel_ac97c_write,
918
.read = atmel_ac97c_read,
923
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
925
dev_dbg(&pdev->dev, "no memory resource\n");
929
pdata = pdev->dev.platform_data;
931
dev_dbg(&pdev->dev, "no platform data\n");
935
irq = platform_get_irq(pdev, 0);
937
dev_dbg(&pdev->dev, "could not get irq\n");
941
if (cpu_is_at32ap7000()) {
942
pclk = clk_get(&pdev->dev, "pclk");
944
pclk = clk_get(&pdev->dev, "ac97_clk");
948
dev_dbg(&pdev->dev, "no peripheral clock\n");
949
return PTR_ERR(pclk);
953
retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
954
THIS_MODULE, sizeof(struct atmel_ac97c), &card);
956
dev_dbg(&pdev->dev, "could not create sound card device\n");
957
goto err_snd_card_new;
960
chip = get_chip(card);
962
retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
964
dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
965
goto err_request_irq;
969
spin_lock_init(&chip->lock);
971
strcpy(card->driver, "Atmel AC97C");
972
strcpy(card->shortname, "Atmel AC97C");
973
sprintf(card->longname, "Atmel AC97 controller");
978
chip->regs = ioremap(regs->start, resource_size(regs));
981
dev_dbg(&pdev->dev, "could not remap register memory\n");
985
if (gpio_is_valid(pdata->reset_pin)) {
986
if (gpio_request(pdata->reset_pin, "reset_pin")) {
987
dev_dbg(&pdev->dev, "reset pin not available\n");
988
chip->reset_pin = -ENODEV;
990
gpio_direction_output(pdata->reset_pin, 1);
991
chip->reset_pin = pdata->reset_pin;
995
snd_card_set_dev(card, &pdev->dev);
997
atmel_ac97c_reset(chip);
999
/* Enable overrun interrupt from codec channel */
1000
ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
1001
ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
1003
retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
1005
dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
1009
retval = atmel_ac97c_mixer_new(chip);
1011
dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
1015
if (cpu_is_at32ap7000()) {
1016
if (pdata->rx_dws.dma_dev) {
1017
struct dw_dma_slave *dws = &pdata->rx_dws;
1018
dma_cap_mask_t mask;
1020
dws->rx_reg = regs->start + AC97C_CARHR + 2;
1023
dma_cap_set(DMA_SLAVE, mask);
1025
chip->dma.rx_chan = dma_request_channel(mask, filter,
1028
dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
1029
dev_name(&chip->dma.rx_chan->dev->device));
1030
set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1033
if (pdata->tx_dws.dma_dev) {
1034
struct dw_dma_slave *dws = &pdata->tx_dws;
1035
dma_cap_mask_t mask;
1037
dws->tx_reg = regs->start + AC97C_CATHR + 2;
1040
dma_cap_set(DMA_SLAVE, mask);
1042
chip->dma.tx_chan = dma_request_channel(mask, filter,
1045
dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
1046
dev_name(&chip->dma.tx_chan->dev->device));
1047
set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1050
if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
1051
!test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
1052
dev_dbg(&pdev->dev, "DMA not available\n");
1057
/* Just pretend that we have DMA channel(for at91 i is actually
1059
set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1060
set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1063
retval = atmel_ac97c_pcm_new(chip);
1065
dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
1069
retval = snd_card_register(card);
1071
dev_dbg(&pdev->dev, "could not register sound card\n");
1075
platform_set_drvdata(pdev, card);
1077
dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
1083
if (cpu_is_at32ap7000()) {
1084
if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1085
dma_release_channel(chip->dma.rx_chan);
1086
if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1087
dma_release_channel(chip->dma.tx_chan);
1088
clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1089
clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1090
chip->dma.rx_chan = NULL;
1091
chip->dma.tx_chan = NULL;
1094
snd_card_set_dev(card, NULL);
1096
if (gpio_is_valid(chip->reset_pin))
1097
gpio_free(chip->reset_pin);
1099
iounmap(chip->regs);
1101
free_irq(irq, chip);
1103
snd_card_free(card);
1111
static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg)
1113
struct snd_card *card = platform_get_drvdata(pdev);
1114
struct atmel_ac97c *chip = card->private_data;
1116
if (cpu_is_at32ap7000()) {
1117
if (test_bit(DMA_RX_READY, &chip->flags))
1118
dw_dma_cyclic_stop(chip->dma.rx_chan);
1119
if (test_bit(DMA_TX_READY, &chip->flags))
1120
dw_dma_cyclic_stop(chip->dma.tx_chan);
1122
clk_disable(chip->pclk);
1127
static int atmel_ac97c_resume(struct platform_device *pdev)
1129
struct snd_card *card = platform_get_drvdata(pdev);
1130
struct atmel_ac97c *chip = card->private_data;
1132
clk_enable(chip->pclk);
1133
if (cpu_is_at32ap7000()) {
1134
if (test_bit(DMA_RX_READY, &chip->flags))
1135
dw_dma_cyclic_start(chip->dma.rx_chan);
1136
if (test_bit(DMA_TX_READY, &chip->flags))
1137
dw_dma_cyclic_start(chip->dma.tx_chan);
1142
#define atmel_ac97c_suspend NULL
1143
#define atmel_ac97c_resume NULL
1146
static int __devexit atmel_ac97c_remove(struct platform_device *pdev)
1148
struct snd_card *card = platform_get_drvdata(pdev);
1149
struct atmel_ac97c *chip = get_chip(card);
1151
if (gpio_is_valid(chip->reset_pin))
1152
gpio_free(chip->reset_pin);
1154
ac97c_writel(chip, CAMR, 0);
1155
ac97c_writel(chip, COMR, 0);
1156
ac97c_writel(chip, MR, 0);
1158
clk_disable(chip->pclk);
1159
clk_put(chip->pclk);
1160
iounmap(chip->regs);
1161
free_irq(chip->irq, chip);
1163
if (cpu_is_at32ap7000()) {
1164
if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1165
dma_release_channel(chip->dma.rx_chan);
1166
if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1167
dma_release_channel(chip->dma.tx_chan);
1168
clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1169
clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1170
chip->dma.rx_chan = NULL;
1171
chip->dma.tx_chan = NULL;
1174
snd_card_set_dev(card, NULL);
1175
snd_card_free(card);
1177
platform_set_drvdata(pdev, NULL);
1182
static struct platform_driver atmel_ac97c_driver = {
1183
.remove = __devexit_p(atmel_ac97c_remove),
1185
.name = "atmel_ac97c",
1187
.suspend = atmel_ac97c_suspend,
1188
.resume = atmel_ac97c_resume,
1191
static int __init atmel_ac97c_init(void)
1193
return platform_driver_probe(&atmel_ac97c_driver,
1196
module_init(atmel_ac97c_init);
1198
static void __exit atmel_ac97c_exit(void)
1200
platform_driver_unregister(&atmel_ac97c_driver);
1202
module_exit(atmel_ac97c_exit);
1204
MODULE_LICENSE("GPL");
1205
MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
1206
MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");