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a971b42cbf
Fix cppcheck warnings: sound/atmel/ac97c.c:478:30: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation] casr & AC97C_CSR_OVRUN ? " OVRUN" : "", ^ sound/atmel/ac97c.c:479:30: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation] casr & AC97C_CSR_RXRDY ? " RXRDY" : "", ^ sound/atmel/ac97c.c:480:30: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation] casr & AC97C_CSR_UNRUN ? " UNRUN" : "", ^ sound/atmel/ac97c.c:481:30: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation] casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", ^ sound/atmel/ac97c.c:482:30: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation] casr & AC97C_CSR_TXRDY ? " TXRDY" : "", ^ sound/atmel/ac97c.c:524:30: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation] cosr & AC97C_CSR_OVRUN ? " OVRUN" : "", ^ sound/atmel/ac97c.c:525:30: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation] cosr & AC97C_CSR_RXRDY ? " RXRDY" : "", ^ sound/atmel/ac97c.c:526:30: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation] cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", ^ sound/atmel/ac97c.c:527:30: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation] cosr & AC97C_CSR_TXRDY ? " TXRDY" : "", ^ Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20200902212133.30964-15-pierre-louis.bossart@linux.intel.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
879 lines
22 KiB
C
879 lines
22 KiB
C
// 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,
|
|
.hw_params = atmel_ac97c_playback_hw_params,
|
|
.prepare = atmel_ac97c_playback_prepare,
|
|
.trigger = atmel_ac97c_playback_trigger,
|
|
.pointer = atmel_ac97c_playback_pointer,
|
|
};
|
|
|
|
static const struct snd_pcm_ops atmel_ac97_capture_ops = {
|
|
.open = atmel_ac97c_capture_open,
|
|
.close = atmel_ac97c_capture_close,
|
|
.hw_params = atmel_ac97c_capture_hw_params,
|
|
.prepare = atmel_ac97c_capture_prepare,
|
|
.trigger = atmel_ac97c_capture_trigger,
|
|
.pointer = atmel_ac97c_capture_pointer,
|
|
};
|
|
|
|
static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
|
|
{
|
|
struct atmel_ac97c *chip = (struct atmel_ac97c *)dev;
|
|
irqreturn_t retval = IRQ_NONE;
|
|
u32 sr = ac97c_readl(chip, SR);
|
|
u32 casr = ac97c_readl(chip, CASR);
|
|
u32 cosr = ac97c_readl(chip, COSR);
|
|
u32 camr = ac97c_readl(chip, CAMR);
|
|
|
|
if (sr & AC97C_SR_CAEVT) {
|
|
struct snd_pcm_runtime *runtime;
|
|
int offset, next_period, block_size;
|
|
dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
|
|
(casr & AC97C_CSR_OVRUN) ? " OVRUN" : "",
|
|
(casr & AC97C_CSR_RXRDY) ? " RXRDY" : "",
|
|
(casr & AC97C_CSR_UNRUN) ? " UNRUN" : "",
|
|
(casr & AC97C_CSR_TXEMPTY) ? " TXEMPTY" : "",
|
|
(casr & AC97C_CSR_TXRDY) ? " TXRDY" : "",
|
|
!casr ? " NONE" : "");
|
|
if ((casr & camr) & AC97C_CSR_ENDTX) {
|
|
runtime = chip->playback_substream->runtime;
|
|
block_size = frames_to_bytes(runtime, runtime->period_size);
|
|
chip->playback_period++;
|
|
|
|
if (chip->playback_period == runtime->periods)
|
|
chip->playback_period = 0;
|
|
next_period = chip->playback_period + 1;
|
|
if (next_period == runtime->periods)
|
|
next_period = 0;
|
|
|
|
offset = block_size * next_period;
|
|
|
|
writel(runtime->dma_addr + offset, chip->regs + ATMEL_PDC_TNPR);
|
|
writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
|
|
|
|
snd_pcm_period_elapsed(chip->playback_substream);
|
|
}
|
|
if ((casr & camr) & AC97C_CSR_ENDRX) {
|
|
runtime = chip->capture_substream->runtime;
|
|
block_size = frames_to_bytes(runtime, runtime->period_size);
|
|
chip->capture_period++;
|
|
|
|
if (chip->capture_period == runtime->periods)
|
|
chip->capture_period = 0;
|
|
next_period = chip->capture_period + 1;
|
|
if (next_period == runtime->periods)
|
|
next_period = 0;
|
|
|
|
offset = block_size * next_period;
|
|
|
|
writel(runtime->dma_addr + offset, chip->regs + ATMEL_PDC_RNPR);
|
|
writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
|
|
snd_pcm_period_elapsed(chip->capture_substream);
|
|
}
|
|
retval = IRQ_HANDLED;
|
|
}
|
|
|
|
if (sr & AC97C_SR_COEVT) {
|
|
dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
|
|
(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 <egtvedt@samfundet.no>");
|