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ALSA: Add ALSA driver for Atmel AC97 controller
This patch adds ALSA support for the AC97 controller found on Atmel AVR32 devices. Tested on ATSTK1006 + ATSTK1000 with a development board with a AC97 codec. Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
parent
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5 changed files with 1053 additions and 0 deletions
40
include/sound/atmel-ac97c.h
Normal file
40
include/sound/atmel-ac97c.h
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@ -0,0 +1,40 @@
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/*
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* Driver for the Atmel AC97C controller
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*
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* Copyright (C) 2005-2009 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#ifndef __INCLUDE_SOUND_ATMEL_AC97C_H
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#define __INCLUDE_SOUND_ATMEL_AC97C_H
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#include <linux/dw_dmac.h>
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#define AC97C_CAPTURE 0x01
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#define AC97C_PLAYBACK 0x02
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#define AC97C_BOTH (AC97C_CAPTURE | AC97C_PLAYBACK)
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/**
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* struct atmel_ac97c_pdata - board specific AC97C configuration
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* @rx_dws: DMA slave interface to use for sound capture.
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* @tx_dws: DMA slave interface to use for sound playback.
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* @reset_pin: GPIO pin wired to the reset input on the external AC97 codec,
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* optional to use, set to -ENODEV if not in use. AC97 layer will
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* try to do a software reset of the external codec anyway.
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* @flags: Flags for which directions should be enabled.
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*
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* If the user do not want to use a DMA channel for playback or capture, i.e.
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* only one feature is required on the board. The slave for playback or capture
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* can be set to NULL. The AC97C driver will take use of this when setting up
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* the sound streams.
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*/
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struct ac97c_platform_data {
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struct dw_dma_slave rx_dws;
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struct dw_dma_slave tx_dws;
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unsigned int flags;
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int reset_pin;
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};
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#endif /* __INCLUDE_SOUND_ATMEL_AC97C_H */
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@ -8,4 +8,12 @@ config SND_ATMEL_ABDAC
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help
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ALSA sound driver for the Atmel Audio Bitstream DAC (ABDAC).
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config SND_ATMEL_AC97C
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tristate "Atmel AC97 Controller (AC97C) driver"
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select SND_PCM
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select SND_AC97_CODEC
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depends on DW_DMAC && AVR32
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help
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ALSA sound driver for the Atmel AC97 controller.
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endmenu
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@ -1,3 +1,5 @@
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snd-atmel-abdac-objs := abdac.o
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snd-atmel-ac97c-objs := ac97c.o
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obj-$(CONFIG_SND_ATMEL_ABDAC) += snd-atmel-abdac.o
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obj-$(CONFIG_SND_ATMEL_AC97C) += snd-atmel-ac97c.o
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932
sound/atmel/ac97c.c
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932
sound/atmel/ac97c.c
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@ -0,0 +1,932 @@
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/*
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* Driver for the Atmel AC97C controller
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*
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* Copyright (C) 2005-2009 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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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/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include <linux/gpio.h>
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#include <linux/io.h>
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#include <sound/core.h>
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#include <sound/initval.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/ac97_codec.h>
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#include <sound/atmel-ac97c.h>
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#include <sound/memalloc.h>
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#include <linux/dw_dmac.h>
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#include "ac97c.h"
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enum {
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DMA_TX_READY = 0,
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DMA_RX_READY,
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DMA_TX_CHAN_PRESENT,
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DMA_RX_CHAN_PRESENT,
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};
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/* Serialize access to opened variable */
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static DEFINE_MUTEX(opened_mutex);
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struct atmel_ac97c_dma {
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struct dma_chan *rx_chan;
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struct dma_chan *tx_chan;
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};
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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 atmel_ac97c_dma dma;
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struct snd_pcm_substream *playback_substream;
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struct snd_pcm_substream *capture_substream;
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struct snd_card *card;
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struct snd_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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unsigned long flags;
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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 opened;
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int 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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/* This function is called by the DMA driver. */
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static void atmel_ac97c_dma_playback_period_done(void *arg)
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{
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struct atmel_ac97c *chip = arg;
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snd_pcm_period_elapsed(chip->playback_substream);
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}
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static void atmel_ac97c_dma_capture_period_done(void *arg)
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{
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struct atmel_ac97c *chip = arg;
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snd_pcm_period_elapsed(chip->capture_substream);
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}
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static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
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struct snd_pcm_substream *substream,
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enum dma_data_direction direction)
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{
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struct dma_chan *chan;
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struct dw_cyclic_desc *cdesc;
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struct snd_pcm_runtime *runtime = substream->runtime;
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unsigned long buffer_len, period_len;
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/*
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* We don't do DMA on "complex" transfers, i.e. with
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* non-halfword-aligned buffers or lengths.
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*/
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if (runtime->dma_addr & 1 || runtime->buffer_size & 1) {
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dev_dbg(&chip->pdev->dev, "too complex transfer\n");
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return -EINVAL;
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}
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if (direction == DMA_TO_DEVICE)
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chan = chip->dma.tx_chan;
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else
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chan = chip->dma.rx_chan;
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buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
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period_len = frames_to_bytes(runtime, runtime->period_size);
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cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len,
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period_len, direction);
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if (IS_ERR(cdesc)) {
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dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n");
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return PTR_ERR(cdesc);
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}
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if (direction == DMA_TO_DEVICE) {
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cdesc->period_callback = atmel_ac97c_dma_playback_period_done;
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set_bit(DMA_TX_READY, &chip->flags);
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} else {
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cdesc->period_callback = atmel_ac97c_dma_capture_period_done;
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set_bit(DMA_RX_READY, &chip->flags);
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}
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cdesc->period_callback_param = chip;
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return 0;
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}
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static struct snd_pcm_hardware atmel_ac97c_hw = {
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.info = (SNDRV_PCM_INFO_MMAP
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| SNDRV_PCM_INFO_MMAP_VALID
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| SNDRV_PCM_INFO_INTERLEAVED
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| SNDRV_PCM_INFO_BLOCK_TRANSFER
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| SNDRV_PCM_INFO_JOINT_DUPLEX
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| SNDRV_PCM_INFO_RESUME
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| SNDRV_PCM_INFO_PAUSE),
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.formats = (SNDRV_PCM_FMTBIT_S16_BE
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| SNDRV_PCM_FMTBIT_S16_LE),
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.rates = (SNDRV_PCM_RATE_CONTINUOUS),
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.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 = 64 * 4096,
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.period_bytes_min = 4096,
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.period_bytes_max = 4096,
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.periods_min = 4,
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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 = (1ULL << 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 = (1ULL << 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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int retval;
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retval = snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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if (retval < 0)
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return retval;
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/* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
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if (retval == 1)
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if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
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dw_dma_cyclic_free(chip->dma.tx_chan);
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/* Set restrictions to params. */
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mutex_lock(&opened_mutex);
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chip->cur_rate = params_rate(hw_params);
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chip->cur_format = params_format(hw_params);
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mutex_unlock(&opened_mutex);
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return retval;
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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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int retval;
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retval = snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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if (retval < 0)
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return retval;
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/* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
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if (retval == 1)
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if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
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dw_dma_cyclic_free(chip->dma.rx_chan);
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/* Set restrictions to params. */
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mutex_lock(&opened_mutex);
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chip->cur_rate = params_rate(hw_params);
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chip->cur_format = params_format(hw_params);
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mutex_unlock(&opened_mutex);
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return retval;
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}
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static int atmel_ac97c_playback_hw_free(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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if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
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dw_dma_cyclic_free(chip->dma.tx_chan);
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return snd_pcm_lib_free_pages(substream);
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}
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static int atmel_ac97c_capture_hw_free(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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if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
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dw_dma_cyclic_free(chip->dma.rx_chan);
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return snd_pcm_lib_free_pages(substream);
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}
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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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unsigned long word = 0;
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int retval;
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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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break;
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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_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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word |= AC97C_CMR_CEM_LITTLE;
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break;
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case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
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default:
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word &= ~(AC97C_CMR_CEM_LITTLE);
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break;
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}
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ac97c_writel(chip, CAMR, 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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if (!test_bit(DMA_TX_READY, &chip->flags))
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retval = atmel_ac97c_prepare_dma(chip, substream,
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DMA_TO_DEVICE);
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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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unsigned long word = 0;
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int retval;
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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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break;
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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_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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word |= AC97C_CMR_CEM_LITTLE;
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break;
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case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
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default:
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word &= ~(AC97C_CMR_CEM_LITTLE);
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break;
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}
|
||||
|
||||
ac97c_writel(chip, CAMR, word);
|
||||
|
||||
/* set variable rate if needed */
|
||||
if (runtime->rate != 48000) {
|
||||
word = ac97c_readl(chip, MR);
|
||||
word |= AC97C_MR_VRA;
|
||||
ac97c_writel(chip, MR, word);
|
||||
} else {
|
||||
word = ac97c_readl(chip, MR);
|
||||
word &= ~(AC97C_MR_VRA);
|
||||
ac97c_writel(chip, MR, word);
|
||||
}
|
||||
|
||||
retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
|
||||
runtime->rate);
|
||||
if (retval)
|
||||
dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
|
||||
runtime->rate);
|
||||
|
||||
if (!test_bit(DMA_RX_READY, &chip->flags))
|
||||
retval = atmel_ac97c_prepare_dma(chip, substream,
|
||||
DMA_FROM_DEVICE);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static int
|
||||
atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
|
||||
{
|
||||
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
|
||||
unsigned long camr;
|
||||
int retval = 0;
|
||||
|
||||
camr = ac97c_readl(chip, CAMR);
|
||||
|
||||
switch (cmd) {
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
|
||||
case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
|
||||
case SNDRV_PCM_TRIGGER_START:
|
||||
retval = dw_dma_cyclic_start(chip->dma.tx_chan);
|
||||
if (retval)
|
||||
goto out;
|
||||
camr |= AC97C_CMR_CENA;
|
||||
break;
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
|
||||
case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
|
||||
case SNDRV_PCM_TRIGGER_STOP:
|
||||
dw_dma_cyclic_stop(chip->dma.tx_chan);
|
||||
if (chip->opened <= 1)
|
||||
camr &= ~AC97C_CMR_CENA;
|
||||
break;
|
||||
default:
|
||||
retval = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
ac97c_writel(chip, CAMR, camr);
|
||||
out:
|
||||
return retval;
|
||||
}
|
||||
|
||||
static int
|
||||
atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
|
||||
{
|
||||
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
|
||||
unsigned long camr;
|
||||
int retval = 0;
|
||||
|
||||
camr = ac97c_readl(chip, CAMR);
|
||||
|
||||
switch (cmd) {
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
|
||||
case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
|
||||
case SNDRV_PCM_TRIGGER_START:
|
||||
retval = dw_dma_cyclic_start(chip->dma.rx_chan);
|
||||
if (retval)
|
||||
goto out;
|
||||
camr |= AC97C_CMR_CENA;
|
||||
break;
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
|
||||
case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
|
||||
case SNDRV_PCM_TRIGGER_STOP:
|
||||
dw_dma_cyclic_stop(chip->dma.rx_chan);
|
||||
if (chip->opened <= 1)
|
||||
camr &= ~AC97C_CMR_CENA;
|
||||
break;
|
||||
default:
|
||||
retval = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
ac97c_writel(chip, CAMR, camr);
|
||||
out:
|
||||
return retval;
|
||||
}
|
||||
|
||||
static snd_pcm_uframes_t
|
||||
atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
snd_pcm_uframes_t frames;
|
||||
unsigned long bytes;
|
||||
|
||||
bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
|
||||
bytes -= runtime->dma_addr;
|
||||
|
||||
frames = bytes_to_frames(runtime, bytes);
|
||||
if (frames >= runtime->buffer_size)
|
||||
frames -= runtime->buffer_size;
|
||||
return frames;
|
||||
}
|
||||
|
||||
static snd_pcm_uframes_t
|
||||
atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
snd_pcm_uframes_t frames;
|
||||
unsigned long bytes;
|
||||
|
||||
bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
|
||||
bytes -= runtime->dma_addr;
|
||||
|
||||
frames = bytes_to_frames(runtime, bytes);
|
||||
if (frames >= runtime->buffer_size)
|
||||
frames -= runtime->buffer_size;
|
||||
return frames;
|
||||
}
|
||||
|
||||
static struct snd_pcm_ops atmel_ac97_playback_ops = {
|
||||
.open = atmel_ac97c_playback_open,
|
||||
.close = atmel_ac97c_playback_close,
|
||||
.ioctl = snd_pcm_lib_ioctl,
|
||||
.hw_params = atmel_ac97c_playback_hw_params,
|
||||
.hw_free = atmel_ac97c_playback_hw_free,
|
||||
.prepare = atmel_ac97c_playback_prepare,
|
||||
.trigger = atmel_ac97c_playback_trigger,
|
||||
.pointer = atmel_ac97c_playback_pointer,
|
||||
};
|
||||
|
||||
static struct snd_pcm_ops atmel_ac97_capture_ops = {
|
||||
.open = atmel_ac97c_capture_open,
|
||||
.close = atmel_ac97c_capture_close,
|
||||
.ioctl = snd_pcm_lib_ioctl,
|
||||
.hw_params = atmel_ac97c_capture_hw_params,
|
||||
.hw_free = atmel_ac97c_capture_hw_free,
|
||||
.prepare = atmel_ac97c_capture_prepare,
|
||||
.trigger = atmel_ac97c_capture_trigger,
|
||||
.pointer = atmel_ac97c_capture_pointer,
|
||||
};
|
||||
|
||||
static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
|
||||
{
|
||||
struct snd_pcm *pcm;
|
||||
struct snd_pcm_hardware hw = atmel_ac97c_hw;
|
||||
int capture, playback, retval;
|
||||
|
||||
capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
|
||||
playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
|
||||
|
||||
retval = snd_pcm_new(chip->card, chip->card->shortname,
|
||||
chip->pdev->id, playback, capture, &pcm);
|
||||
if (retval)
|
||||
return retval;
|
||||
|
||||
if (capture)
|
||||
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
|
||||
&atmel_ac97_capture_ops);
|
||||
if (playback)
|
||||
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
|
||||
&atmel_ac97_playback_ops);
|
||||
|
||||
retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
|
||||
&chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
|
||||
hw.buffer_bytes_max);
|
||||
if (retval)
|
||||
return retval;
|
||||
|
||||
pcm->private_data = chip;
|
||||
pcm->info_flags = 0;
|
||||
strcpy(pcm->name, chip->card->shortname);
|
||||
chip->pcm = pcm;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
|
||||
{
|
||||
struct snd_ac97_template template;
|
||||
memset(&template, 0, sizeof(template));
|
||||
template.private_data = chip;
|
||||
return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
|
||||
}
|
||||
|
||||
static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
|
||||
unsigned short val)
|
||||
{
|
||||
struct atmel_ac97c *chip = get_chip(ac97);
|
||||
unsigned long word;
|
||||
int timeout = 40;
|
||||
|
||||
word = (reg & 0x7f) << 16 | val;
|
||||
|
||||
do {
|
||||
if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
|
||||
ac97c_writel(chip, COTHR, word);
|
||||
return;
|
||||
}
|
||||
udelay(1);
|
||||
} while (--timeout);
|
||||
|
||||
dev_dbg(&chip->pdev->dev, "codec write timeout\n");
|
||||
}
|
||||
|
||||
static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
|
||||
unsigned short reg)
|
||||
{
|
||||
struct atmel_ac97c *chip = get_chip(ac97);
|
||||
unsigned long word;
|
||||
int timeout = 40;
|
||||
int write = 10;
|
||||
|
||||
word = (0x80 | (reg & 0x7f)) << 16;
|
||||
|
||||
if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
|
||||
ac97c_readl(chip, CORHR);
|
||||
|
||||
retry_write:
|
||||
timeout = 40;
|
||||
|
||||
do {
|
||||
if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
|
||||
ac97c_writel(chip, COTHR, word);
|
||||
goto read_reg;
|
||||
}
|
||||
udelay(10);
|
||||
} while (--timeout);
|
||||
|
||||
if (!--write)
|
||||
goto timed_out;
|
||||
goto retry_write;
|
||||
|
||||
read_reg:
|
||||
do {
|
||||
if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
|
||||
unsigned short val = ac97c_readl(chip, CORHR);
|
||||
return val;
|
||||
}
|
||||
udelay(10);
|
||||
} while (--timeout);
|
||||
|
||||
if (!--write)
|
||||
goto timed_out;
|
||||
goto retry_write;
|
||||
|
||||
timed_out:
|
||||
dev_dbg(&chip->pdev->dev, "codec read timeout\n");
|
||||
return 0xffff;
|
||||
}
|
||||
|
||||
static bool filter(struct dma_chan *chan, void *slave)
|
||||
{
|
||||
struct dw_dma_slave *dws = slave;
|
||||
|
||||
if (dws->dma_dev == chan->device->dev) {
|
||||
chan->private = dws;
|
||||
return true;
|
||||
} else
|
||||
return false;
|
||||
}
|
||||
|
||||
static void atmel_ac97c_reset(struct atmel_ac97c *chip)
|
||||
{
|
||||
ac97c_writel(chip, MR, AC97C_MR_WRST);
|
||||
|
||||
if (gpio_is_valid(chip->reset_pin)) {
|
||||
gpio_set_value(chip->reset_pin, 0);
|
||||
/* AC97 v2.2 specifications says minimum 1 us. */
|
||||
udelay(10);
|
||||
gpio_set_value(chip->reset_pin, 1);
|
||||
}
|
||||
|
||||
udelay(1);
|
||||
ac97c_writel(chip, MR, AC97C_MR_ENA);
|
||||
}
|
||||
|
||||
static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct snd_card *card;
|
||||
struct atmel_ac97c *chip;
|
||||
struct resource *regs;
|
||||
struct ac97c_platform_data *pdata;
|
||||
struct clk *pclk;
|
||||
static struct snd_ac97_bus_ops ops = {
|
||||
.write = atmel_ac97c_write,
|
||||
.read = atmel_ac97c_read,
|
||||
};
|
||||
int retval;
|
||||
|
||||
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!regs) {
|
||||
dev_dbg(&pdev->dev, "no memory resource\n");
|
||||
return -ENXIO;
|
||||
}
|
||||
|
||||
pdata = pdev->dev.platform_data;
|
||||
if (!pdata) {
|
||||
dev_dbg(&pdev->dev, "no platform data\n");
|
||||
return -ENXIO;
|
||||
}
|
||||
|
||||
pclk = clk_get(&pdev->dev, "pclk");
|
||||
if (IS_ERR(pclk)) {
|
||||
dev_dbg(&pdev->dev, "no peripheral clock\n");
|
||||
return PTR_ERR(pclk);
|
||||
}
|
||||
clk_enable(pclk);
|
||||
|
||||
retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
|
||||
THIS_MODULE, sizeof(struct atmel_ac97c), &card);
|
||||
if (retval) {
|
||||
dev_dbg(&pdev->dev, "could not create sound card device\n");
|
||||
goto err_snd_card_new;
|
||||
}
|
||||
|
||||
chip = get_chip(card);
|
||||
|
||||
spin_lock_init(&chip->lock);
|
||||
|
||||
strcpy(card->driver, "Atmel AC97C");
|
||||
strcpy(card->shortname, "Atmel AC97C");
|
||||
sprintf(card->longname, "Atmel AC97 controller");
|
||||
|
||||
chip->card = card;
|
||||
chip->pclk = pclk;
|
||||
chip->pdev = pdev;
|
||||
chip->regs = ioremap(regs->start, regs->end - regs->start + 1);
|
||||
|
||||
if (!chip->regs) {
|
||||
dev_dbg(&pdev->dev, "could not remap register memory\n");
|
||||
goto err_ioremap;
|
||||
}
|
||||
|
||||
if (gpio_is_valid(pdata->reset_pin)) {
|
||||
if (gpio_request(pdata->reset_pin, "reset_pin")) {
|
||||
dev_dbg(&pdev->dev, "reset pin not available\n");
|
||||
chip->reset_pin = -ENODEV;
|
||||
} else {
|
||||
gpio_direction_output(pdata->reset_pin, 1);
|
||||
chip->reset_pin = pdata->reset_pin;
|
||||
}
|
||||
}
|
||||
|
||||
snd_card_set_dev(card, &pdev->dev);
|
||||
|
||||
retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
|
||||
if (retval) {
|
||||
dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
|
||||
goto err_ac97_bus;
|
||||
}
|
||||
|
||||
atmel_ac97c_reset(chip);
|
||||
|
||||
retval = atmel_ac97c_mixer_new(chip);
|
||||
if (retval) {
|
||||
dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
|
||||
goto err_ac97_bus;
|
||||
}
|
||||
|
||||
if (pdata->rx_dws.dma_dev) {
|
||||
struct dw_dma_slave *dws = &pdata->rx_dws;
|
||||
dma_cap_mask_t mask;
|
||||
|
||||
dws->rx_reg = regs->start + AC97C_CARHR + 2;
|
||||
|
||||
dma_cap_zero(mask);
|
||||
dma_cap_set(DMA_SLAVE, mask);
|
||||
|
||||
chip->dma.rx_chan = dma_request_channel(mask, filter, dws);
|
||||
|
||||
dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
|
||||
chip->dma.rx_chan->dev->device.bus_id);
|
||||
set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
|
||||
}
|
||||
|
||||
if (pdata->tx_dws.dma_dev) {
|
||||
struct dw_dma_slave *dws = &pdata->tx_dws;
|
||||
dma_cap_mask_t mask;
|
||||
|
||||
dws->tx_reg = regs->start + AC97C_CATHR + 2;
|
||||
|
||||
dma_cap_zero(mask);
|
||||
dma_cap_set(DMA_SLAVE, mask);
|
||||
|
||||
chip->dma.tx_chan = dma_request_channel(mask, filter, dws);
|
||||
|
||||
dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
|
||||
chip->dma.tx_chan->dev->device.bus_id);
|
||||
set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
|
||||
}
|
||||
|
||||
if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
|
||||
!test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
|
||||
dev_dbg(&pdev->dev, "DMA not available\n");
|
||||
retval = -ENODEV;
|
||||
goto err_dma;
|
||||
}
|
||||
|
||||
retval = atmel_ac97c_pcm_new(chip);
|
||||
if (retval) {
|
||||
dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
|
||||
goto err_dma;
|
||||
}
|
||||
|
||||
retval = snd_card_register(card);
|
||||
if (retval) {
|
||||
dev_dbg(&pdev->dev, "could not register sound card\n");
|
||||
goto err_ac97_bus;
|
||||
}
|
||||
|
||||
platform_set_drvdata(pdev, card);
|
||||
|
||||
dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p\n",
|
||||
chip->regs);
|
||||
|
||||
return 0;
|
||||
|
||||
err_dma:
|
||||
if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
|
||||
dma_release_channel(chip->dma.rx_chan);
|
||||
if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
|
||||
dma_release_channel(chip->dma.tx_chan);
|
||||
clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
|
||||
clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
|
||||
chip->dma.rx_chan = NULL;
|
||||
chip->dma.tx_chan = NULL;
|
||||
err_ac97_bus:
|
||||
snd_card_set_dev(card, NULL);
|
||||
|
||||
if (gpio_is_valid(chip->reset_pin))
|
||||
gpio_free(chip->reset_pin);
|
||||
|
||||
iounmap(chip->regs);
|
||||
err_ioremap:
|
||||
snd_card_free(card);
|
||||
err_snd_card_new:
|
||||
clk_disable(pclk);
|
||||
clk_put(pclk);
|
||||
return retval;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg)
|
||||
{
|
||||
struct snd_card *card = platform_get_drvdata(pdev);
|
||||
struct atmel_ac97c *chip = card->private_data;
|
||||
|
||||
if (test_bit(DMA_RX_READY, &chip->flags))
|
||||
dw_dma_cyclic_stop(chip->dma.rx_chan);
|
||||
if (test_bit(DMA_TX_READY, &chip->flags))
|
||||
dw_dma_cyclic_stop(chip->dma.tx_chan);
|
||||
clk_disable(chip->pclk);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int atmel_ac97c_resume(struct platform_device *pdev)
|
||||
{
|
||||
struct snd_card *card = platform_get_drvdata(pdev);
|
||||
struct atmel_ac97c *chip = card->private_data;
|
||||
|
||||
clk_enable(chip->pclk);
|
||||
if (test_bit(DMA_RX_READY, &chip->flags))
|
||||
dw_dma_cyclic_start(chip->dma.rx_chan);
|
||||
if (test_bit(DMA_TX_READY, &chip->flags))
|
||||
dw_dma_cyclic_start(chip->dma.tx_chan);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
#define atmel_ac97c_suspend NULL
|
||||
#define atmel_ac97c_resume NULL
|
||||
#endif
|
||||
|
||||
static int __devexit atmel_ac97c_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct snd_card *card = platform_get_drvdata(pdev);
|
||||
struct atmel_ac97c *chip = get_chip(card);
|
||||
|
||||
if (gpio_is_valid(chip->reset_pin))
|
||||
gpio_free(chip->reset_pin);
|
||||
|
||||
clk_disable(chip->pclk);
|
||||
clk_put(chip->pclk);
|
||||
iounmap(chip->regs);
|
||||
|
||||
if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
|
||||
dma_release_channel(chip->dma.rx_chan);
|
||||
if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
|
||||
dma_release_channel(chip->dma.tx_chan);
|
||||
clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
|
||||
clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
|
||||
chip->dma.rx_chan = NULL;
|
||||
chip->dma.tx_chan = NULL;
|
||||
|
||||
snd_card_set_dev(card, NULL);
|
||||
snd_card_free(card);
|
||||
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver atmel_ac97c_driver = {
|
||||
.remove = __devexit_p(atmel_ac97c_remove),
|
||||
.driver = {
|
||||
.name = "atmel_ac97c",
|
||||
},
|
||||
.suspend = atmel_ac97c_suspend,
|
||||
.resume = atmel_ac97c_resume,
|
||||
};
|
||||
|
||||
static int __init atmel_ac97c_init(void)
|
||||
{
|
||||
return platform_driver_probe(&atmel_ac97c_driver,
|
||||
atmel_ac97c_probe);
|
||||
}
|
||||
module_init(atmel_ac97c_init);
|
||||
|
||||
static void __exit atmel_ac97c_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&atmel_ac97c_driver);
|
||||
}
|
||||
module_exit(atmel_ac97c_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
|
||||
MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>");
|
71
sound/atmel/ac97c.h
Normal file
71
sound/atmel/ac97c.h
Normal file
|
@ -0,0 +1,71 @@
|
|||
/*
|
||||
* Register definitions for the Atmel AC97C controller
|
||||
*
|
||||
* Copyright (C) 2005-2009 Atmel Corporation
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License version 2 as published
|
||||
* by the Free Software Foundation.
|
||||
*/
|
||||
#ifndef __SOUND_ATMEL_AC97C_H
|
||||
#define __SOUND_ATMEL_AC97C_H
|
||||
|
||||
#define AC97C_MR 0x08
|
||||
#define AC97C_ICA 0x10
|
||||
#define AC97C_OCA 0x14
|
||||
#define AC97C_CARHR 0x20
|
||||
#define AC97C_CATHR 0x24
|
||||
#define AC97C_CASR 0x28
|
||||
#define AC97C_CAMR 0x2c
|
||||
#define AC97C_CBRHR 0x30
|
||||
#define AC97C_CBTHR 0x34
|
||||
#define AC97C_CBSR 0x38
|
||||
#define AC97C_CBMR 0x3c
|
||||
#define AC97C_CORHR 0x40
|
||||
#define AC97C_COTHR 0x44
|
||||
#define AC97C_COSR 0x48
|
||||
#define AC97C_COMR 0x4c
|
||||
#define AC97C_SR 0x50
|
||||
#define AC97C_IER 0x54
|
||||
#define AC97C_IDR 0x58
|
||||
#define AC97C_IMR 0x5c
|
||||
#define AC97C_VERSION 0xfc
|
||||
|
||||
#define AC97C_CATPR PDC_TPR
|
||||
#define AC97C_CATCR PDC_TCR
|
||||
#define AC97C_CATNPR PDC_TNPR
|
||||
#define AC97C_CATNCR PDC_TNCR
|
||||
#define AC97C_CARPR PDC_RPR
|
||||
#define AC97C_CARCR PDC_RCR
|
||||
#define AC97C_CARNPR PDC_RNPR
|
||||
#define AC97C_CARNCR PDC_RNCR
|
||||
#define AC97C_PTCR PDC_PTCR
|
||||
|
||||
#define AC97C_MR_ENA (1 << 0)
|
||||
#define AC97C_MR_WRST (1 << 1)
|
||||
#define AC97C_MR_VRA (1 << 2)
|
||||
|
||||
#define AC97C_CSR_TXRDY (1 << 0)
|
||||
#define AC97C_CSR_UNRUN (1 << 2)
|
||||
#define AC97C_CSR_RXRDY (1 << 4)
|
||||
#define AC97C_CSR_ENDTX (1 << 10)
|
||||
#define AC97C_CSR_ENDRX (1 << 14)
|
||||
|
||||
#define AC97C_CMR_SIZE_20 (0 << 16)
|
||||
#define AC97C_CMR_SIZE_18 (1 << 16)
|
||||
#define AC97C_CMR_SIZE_16 (2 << 16)
|
||||
#define AC97C_CMR_SIZE_10 (3 << 16)
|
||||
#define AC97C_CMR_CEM_LITTLE (1 << 18)
|
||||
#define AC97C_CMR_CEM_BIG (0 << 18)
|
||||
#define AC97C_CMR_CENA (1 << 21)
|
||||
#define AC97C_CMR_DMAEN (1 << 22)
|
||||
|
||||
#define AC97C_SR_CAEVT (1 << 3)
|
||||
|
||||
#define AC97C_CH_ASSIGN(slot, channel) \
|
||||
(AC97C_CHANNEL_##channel << (3 * (AC97_SLOT_##slot - 3)))
|
||||
#define AC97C_CHANNEL_NONE 0x0
|
||||
#define AC97C_CHANNEL_A 0x1
|
||||
#define AC97C_CHANNEL_B 0x2
|
||||
|
||||
#endif /* __SOUND_ATMEL_AC97C_H */
|
Loading…
Reference in a new issue