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878 lines
22 KiB
878 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Driver for Atmel AC97C |
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* |
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* Copyright (C) 2005-2009 Atmel Corporation |
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*/ |
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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/atmel_pdc.h> |
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#include <linux/gpio/consumer.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/types.h> |
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#include <linux/io.h> |
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#include <linux/of.h> |
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#include <linux/of_device.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/memalloc.h> |
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#include "ac97c.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 { |
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struct clk *pclk; |
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struct platform_device *pdev; |
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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_pcm *pcm; |
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struct snd_ac97 *ac97; |
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struct snd_ac97_bus *ac97_bus; |
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u64 cur_format; |
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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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spinlock_t lock; |
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void __iomem *regs; |
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int irq; |
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int opened; |
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struct gpio_desc *reset_pin; |
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}; |
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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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static const 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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.rate_min = 4000, |
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.rate_max = 48000, |
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.channels_min = 1, |
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.channels_max = 2, |
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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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.periods_min = 6, |
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.periods_max = 64, |
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}; |
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static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream) |
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{ |
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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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chip->opened++; |
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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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} |
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if (chip->cur_format) |
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runtime->hw.formats = pcm_format_to_bits(chip->cur_format); |
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mutex_unlock(&opened_mutex); |
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chip->playback_substream = substream; |
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return 0; |
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} |
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static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream) |
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{ |
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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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chip->opened++; |
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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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} |
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if (chip->cur_format) |
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runtime->hw.formats = pcm_format_to_bits(chip->cur_format); |
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mutex_unlock(&opened_mutex); |
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chip->capture_substream = substream; |
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return 0; |
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} |
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static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream) |
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{ |
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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->opened--; |
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if (!chip->opened) { |
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chip->cur_rate = 0; |
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chip->cur_format = 0; |
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} |
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mutex_unlock(&opened_mutex); |
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chip->playback_substream = NULL; |
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return 0; |
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} |
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static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream) |
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{ |
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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->opened--; |
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if (!chip->opened) { |
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chip->cur_rate = 0; |
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chip->cur_format = 0; |
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} |
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mutex_unlock(&opened_mutex); |
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chip->capture_substream = NULL; |
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return 0; |
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} |
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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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{ |
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
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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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return 0; |
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} |
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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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{ |
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struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); |
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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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return 0; |
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} |
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static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) |
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{ |
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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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int retval; |
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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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case 1: |
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word |= AC97C_CH_ASSIGN(PCM_LEFT, A); |
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break; |
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case 2: |
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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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break; |
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default: |
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/* TODO: support more than two channels */ |
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return -EINVAL; |
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} |
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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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else |
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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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break; |
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case SNDRV_PCM_FORMAT_S16_BE: |
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word &= ~(AC97C_CMR_CEM_LITTLE); |
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break; |
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default: |
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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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return -EINVAL; |
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} |
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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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} else { |
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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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} |
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retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, |
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runtime->rate); |
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if (retval) |
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dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", |
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runtime->rate); |
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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, chip->regs + ATMEL_PDC_TNPR); |
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writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR); |
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return retval; |
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} |
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static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) |
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{ |
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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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int retval; |
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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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case 1: |
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word |= AC97C_CH_ASSIGN(PCM_LEFT, A); |
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break; |
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case 2: |
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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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break; |
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default: |
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/* TODO: support more than two channels */ |
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return -EINVAL; |
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} |
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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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else |
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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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break; |
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case SNDRV_PCM_FORMAT_S16_BE: |
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word &= ~(AC97C_CMR_CEM_LITTLE); |
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break; |
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default: |
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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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return -EINVAL; |
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} |
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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 */ |
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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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} else { |
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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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} |
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retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, |
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runtime->rate); |
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if (retval) |
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dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", |
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runtime->rate); |
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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, chip->regs + ATMEL_PDC_RNPR); |
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writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR); |
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return retval; |
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} |
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static int |
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atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) |
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{ |
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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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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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case SNDRV_PCM_TRIGGER_START: |
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ptcr = ATMEL_PDC_TXTEN; |
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camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX; |
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break; |
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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case SNDRV_PCM_TRIGGER_STOP: |
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ptcr |= ATMEL_PDC_TXTDIS; |
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if (chip->opened <= 1) |
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camr &= ~AC97C_CMR_CENA; |
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break; |
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default: |
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return -EINVAL; |
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} |
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ac97c_writel(chip, CAMR, camr); |
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writel(ptcr, chip->regs + ATMEL_PDC_PTCR); |
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return 0; |
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} |
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static int |
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atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) |
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{ |
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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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ptcr = readl(chip->regs + ATMEL_PDC_PTSR); |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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case SNDRV_PCM_TRIGGER_START: |
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ptcr = ATMEL_PDC_RXTEN; |
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camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX; |
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break; |
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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case SNDRV_PCM_TRIGGER_STOP: |
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ptcr |= ATMEL_PDC_RXTDIS; |
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if (chip->opened <= 1) |
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camr &= ~AC97C_CMR_CENA; |
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break; |
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default: |
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return -EINVAL; |
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} |
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ac97c_writel(chip, CAMR, camr); |
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writel(ptcr, chip->regs + ATMEL_PDC_PTCR); |
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return 0; |
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} |
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static snd_pcm_uframes_t |
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atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream) |
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{ |
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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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snd_pcm_uframes_t frames; |
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unsigned long bytes; |
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bytes = readl(chip->regs + ATMEL_PDC_TPR); |
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bytes -= runtime->dma_addr; |
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frames = bytes_to_frames(runtime, bytes); |
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if (frames >= runtime->buffer_size) |
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frames -= runtime->buffer_size; |
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return frames; |
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} |
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static snd_pcm_uframes_t |
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atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) |
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{ |
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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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snd_pcm_uframes_t frames; |
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unsigned long bytes; |
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bytes = readl(chip->regs + ATMEL_PDC_RPR); |
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bytes -= runtime->dma_addr; |
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frames = bytes_to_frames(runtime, bytes); |
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if (frames >= runtime->buffer_size) |
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frames -= runtime->buffer_size; |
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return frames; |
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} |
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static const struct snd_pcm_ops atmel_ac97_playback_ops = { |
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.open = atmel_ac97c_playback_open, |
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.close = atmel_ac97c_playback_close, |
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.hw_params = atmel_ac97c_playback_hw_params, |
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.prepare = atmel_ac97c_playback_prepare, |
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.trigger = atmel_ac97c_playback_trigger, |
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.pointer = atmel_ac97c_playback_pointer, |
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}; |
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static const struct snd_pcm_ops atmel_ac97_capture_ops = { |
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.open = atmel_ac97c_capture_open, |
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.close = atmel_ac97c_capture_close, |
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.hw_params = atmel_ac97c_capture_hw_params, |
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.prepare = atmel_ac97c_capture_prepare, |
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.trigger = atmel_ac97c_capture_trigger, |
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.pointer = atmel_ac97c_capture_pointer, |
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}; |
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static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) |
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{ |
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struct atmel_ac97c *chip = (struct atmel_ac97c *)dev; |
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irqreturn_t retval = IRQ_NONE; |
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u32 sr = ac97c_readl(chip, SR); |
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u32 casr = ac97c_readl(chip, CASR); |
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u32 cosr = ac97c_readl(chip, COSR); |
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u32 camr = ac97c_readl(chip, CAMR); |
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|
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if (sr & AC97C_SR_CAEVT) { |
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struct snd_pcm_runtime *runtime; |
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int offset, next_period, block_size; |
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dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n", |
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(casr & AC97C_CSR_OVRUN) ? " OVRUN" : "", |
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(casr & AC97C_CSR_RXRDY) ? " RXRDY" : "", |
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(casr & AC97C_CSR_UNRUN) ? " UNRUN" : "", |
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(casr & AC97C_CSR_TXEMPTY) ? " TXEMPTY" : "", |
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(casr & AC97C_CSR_TXRDY) ? " TXRDY" : "", |
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!casr ? " NONE" : ""); |
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if ((casr & camr) & AC97C_CSR_ENDTX) { |
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runtime = chip->playback_substream->runtime; |
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block_size = frames_to_bytes(runtime, runtime->period_size); |
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chip->playback_period++; |
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|
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if (chip->playback_period == runtime->periods) |
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chip->playback_period = 0; |
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next_period = chip->playback_period + 1; |
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if (next_period == runtime->periods) |
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next_period = 0; |
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|
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offset = block_size * next_period; |
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|
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writel(runtime->dma_addr + offset, chip->regs + ATMEL_PDC_TNPR); |
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writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR); |
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|
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snd_pcm_period_elapsed(chip->playback_substream); |
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} |
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if ((casr & camr) & AC97C_CSR_ENDRX) { |
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runtime = chip->capture_substream->runtime; |
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block_size = frames_to_bytes(runtime, runtime->period_size); |
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chip->capture_period++; |
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if (chip->capture_period == runtime->periods) |
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chip->capture_period = 0; |
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next_period = chip->capture_period + 1; |
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if (next_period == runtime->periods) |
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next_period = 0; |
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offset = block_size * next_period; |
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|
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writel(runtime->dma_addr + offset, chip->regs + ATMEL_PDC_RNPR); |
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writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR); |
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snd_pcm_period_elapsed(chip->capture_substream); |
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} |
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retval = IRQ_HANDLED; |
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} |
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|
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if (sr & AC97C_SR_COEVT) { |
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dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n", |
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(cosr & AC97C_CSR_OVRUN) ? " OVRUN" : "", |
|
(cosr & AC97C_CSR_RXRDY) ? " RXRDY" : "", |
|
(cosr & AC97C_CSR_TXEMPTY) ? " TXEMPTY" : "", |
|
(cosr & AC97C_CSR_TXRDY) ? " TXRDY" : "", |
|
!cosr ? " NONE" : ""); |
|
retval = IRQ_HANDLED; |
|
} |
|
|
|
if (retval == IRQ_NONE) { |
|
dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x " |
|
"casr 0x%08x cosr 0x%08x\n", sr, casr, cosr); |
|
} |
|
|
|
return retval; |
|
} |
|
|
|
static const struct ac97_pcm at91_ac97_pcm_defs[] = { |
|
/* Playback */ |
|
{ |
|
.exclusive = 1, |
|
.r = { { |
|
.slots = ((1 << AC97_SLOT_PCM_LEFT) |
|
| (1 << AC97_SLOT_PCM_RIGHT)), |
|
} }, |
|
}, |
|
/* PCM in */ |
|
{ |
|
.stream = 1, |
|
.exclusive = 1, |
|
.r = { { |
|
.slots = ((1 << AC97_SLOT_PCM_LEFT) |
|
| (1 << AC97_SLOT_PCM_RIGHT)), |
|
} } |
|
}, |
|
/* Mic in */ |
|
{ |
|
.stream = 1, |
|
.exclusive = 1, |
|
.r = { { |
|
.slots = (1<<AC97_SLOT_MIC), |
|
} } |
|
}, |
|
}; |
|
|
|
static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip) |
|
{ |
|
struct snd_pcm *pcm; |
|
struct snd_pcm_hardware hw = atmel_ac97c_hw; |
|
int retval; |
|
|
|
retval = snd_ac97_pcm_assign(chip->ac97_bus, |
|
ARRAY_SIZE(at91_ac97_pcm_defs), |
|
at91_ac97_pcm_defs); |
|
if (retval) |
|
return retval; |
|
|
|
retval = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm); |
|
if (retval) |
|
return retval; |
|
|
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &atmel_ac97_capture_ops); |
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &atmel_ac97_playback_ops); |
|
|
|
snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, |
|
&chip->pdev->dev, hw.periods_min * hw.period_bytes_min, |
|
hw.buffer_bytes_max); |
|
|
|
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 void atmel_ac97c_reset(struct atmel_ac97c *chip) |
|
{ |
|
ac97c_writel(chip, MR, 0); |
|
ac97c_writel(chip, MR, AC97C_MR_ENA); |
|
ac97c_writel(chip, CAMR, 0); |
|
ac97c_writel(chip, COMR, 0); |
|
|
|
if (!IS_ERR(chip->reset_pin)) { |
|
gpiod_set_value(chip->reset_pin, 0); |
|
/* AC97 v2.2 specifications says minimum 1 us. */ |
|
udelay(2); |
|
gpiod_set_value(chip->reset_pin, 1); |
|
} else { |
|
ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA); |
|
udelay(2); |
|
ac97c_writel(chip, MR, AC97C_MR_ENA); |
|
} |
|
} |
|
|
|
static const struct of_device_id atmel_ac97c_dt_ids[] = { |
|
{ .compatible = "atmel,at91sam9263-ac97c", }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids); |
|
|
|
static int atmel_ac97c_probe(struct platform_device *pdev) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
struct snd_card *card; |
|
struct atmel_ac97c *chip; |
|
struct resource *regs; |
|
struct clk *pclk; |
|
static const struct snd_ac97_bus_ops ops = { |
|
.write = atmel_ac97c_write, |
|
.read = atmel_ac97c_read, |
|
}; |
|
int retval; |
|
int irq; |
|
|
|
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
|
if (!regs) { |
|
dev_dbg(&pdev->dev, "no memory resource\n"); |
|
return -ENXIO; |
|
} |
|
|
|
irq = platform_get_irq(pdev, 0); |
|
if (irq < 0) { |
|
dev_dbg(&pdev->dev, "could not get irq: %d\n", irq); |
|
return irq; |
|
} |
|
|
|
pclk = clk_get(&pdev->dev, "ac97_clk"); |
|
if (IS_ERR(pclk)) { |
|
dev_dbg(&pdev->dev, "no peripheral clock\n"); |
|
return PTR_ERR(pclk); |
|
} |
|
retval = clk_prepare_enable(pclk); |
|
if (retval) |
|
goto err_prepare_enable; |
|
|
|
retval = snd_card_new(&pdev->dev, 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); |
|
|
|
retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip); |
|
if (retval) { |
|
dev_dbg(&pdev->dev, "unable to request irq %d\n", irq); |
|
goto err_request_irq; |
|
} |
|
chip->irq = irq; |
|
|
|
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, resource_size(regs)); |
|
|
|
if (!chip->regs) { |
|
dev_dbg(&pdev->dev, "could not remap register memory\n"); |
|
retval = -ENOMEM; |
|
goto err_ioremap; |
|
} |
|
|
|
chip->reset_pin = devm_gpiod_get_index(dev, "ac97", 2, GPIOD_OUT_HIGH); |
|
if (IS_ERR(chip->reset_pin)) |
|
dev_dbg(dev, "reset pin not available\n"); |
|
|
|
atmel_ac97c_reset(chip); |
|
|
|
/* Enable overrun interrupt from codec channel */ |
|
ac97c_writel(chip, COMR, AC97C_CSR_OVRUN); |
|
ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT); |
|
|
|
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; |
|
} |
|
|
|
retval = atmel_ac97c_mixer_new(chip); |
|
if (retval) { |
|
dev_dbg(&pdev->dev, "could not register ac97 mixer\n"); |
|
goto err_ac97_bus; |
|
} |
|
|
|
retval = atmel_ac97c_pcm_new(chip); |
|
if (retval) { |
|
dev_dbg(&pdev->dev, "could not register ac97 pcm device\n"); |
|
goto err_ac97_bus; |
|
} |
|
|
|
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, irq = %d\n", |
|
chip->regs, irq); |
|
|
|
return 0; |
|
|
|
err_ac97_bus: |
|
iounmap(chip->regs); |
|
err_ioremap: |
|
free_irq(irq, chip); |
|
err_request_irq: |
|
snd_card_free(card); |
|
err_snd_card_new: |
|
clk_disable_unprepare(pclk); |
|
err_prepare_enable: |
|
clk_put(pclk); |
|
return retval; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
static int atmel_ac97c_suspend(struct device *pdev) |
|
{ |
|
struct snd_card *card = dev_get_drvdata(pdev); |
|
struct atmel_ac97c *chip = card->private_data; |
|
|
|
clk_disable_unprepare(chip->pclk); |
|
return 0; |
|
} |
|
|
|
static int atmel_ac97c_resume(struct device *pdev) |
|
{ |
|
struct snd_card *card = dev_get_drvdata(pdev); |
|
struct atmel_ac97c *chip = card->private_data; |
|
int ret = clk_prepare_enable(chip->pclk); |
|
|
|
return ret; |
|
} |
|
|
|
static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume); |
|
#define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm |
|
#else |
|
#define ATMEL_AC97C_PM_OPS NULL |
|
#endif |
|
|
|
static int atmel_ac97c_remove(struct platform_device *pdev) |
|
{ |
|
struct snd_card *card = platform_get_drvdata(pdev); |
|
struct atmel_ac97c *chip = get_chip(card); |
|
|
|
ac97c_writel(chip, CAMR, 0); |
|
ac97c_writel(chip, COMR, 0); |
|
ac97c_writel(chip, MR, 0); |
|
|
|
clk_disable_unprepare(chip->pclk); |
|
clk_put(chip->pclk); |
|
iounmap(chip->regs); |
|
free_irq(chip->irq, chip); |
|
|
|
snd_card_free(card); |
|
|
|
return 0; |
|
} |
|
|
|
static struct platform_driver atmel_ac97c_driver = { |
|
.probe = atmel_ac97c_probe, |
|
.remove = atmel_ac97c_remove, |
|
.driver = { |
|
.name = "atmel_ac97c", |
|
.pm = ATMEL_AC97C_PM_OPS, |
|
.of_match_table = atmel_ac97c_dt_ids, |
|
}, |
|
}; |
|
module_platform_driver(atmel_ac97c_driver); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_DESCRIPTION("Driver for Atmel AC97 controller"); |
|
MODULE_AUTHOR("Hans-Christian Egtvedt <[email protected]>");
|
|
|