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Release 4.8 sound/atmel/ac97c.c

Directory: sound/atmel
/*
 * Driver for Atmel AC97C
 *
 * Copyright (C) 2005-2009 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/bitmap.h>
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/atmel_pdc.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/gpio.h>
#include <linux/types.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_device.h>

#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/ac97_codec.h>
#include <sound/atmel-ac97c.h>
#include <sound/memalloc.h>

#include <linux/platform_data/dma-dw.h>
#include <linux/dma/dw.h>

#ifdef CONFIG_AVR32
#include <mach/cpu.h>
#else

#define cpu_is_at32ap7000() 0
#endif

#include "ac97c.h"

enum {
	
DMA_TX_READY = 0,
	
DMA_RX_READY,
	
DMA_TX_CHAN_PRESENT,
	
DMA_RX_CHAN_PRESENT,
};

/* Serialize access to opened variable */
static DEFINE_MUTEX(opened_mutex);


struct atmel_ac97c_dma {
	
struct dma_chan			*rx_chan;
	
struct dma_chan			*tx_chan;
};


struct atmel_ac97c {
	
struct clk			*pclk;
	
struct platform_device		*pdev;
	
struct atmel_ac97c_dma		dma;

	
struct snd_pcm_substream	*playback_substream;
	
struct snd_pcm_substream	*capture_substream;
	
struct snd_card			*card;
	
struct snd_pcm			*pcm;
	
struct snd_ac97			*ac97;
	
struct snd_ac97_bus		*ac97_bus;

	
u64				cur_format;
	
unsigned int			cur_rate;
	
unsigned long			flags;
	

int				playback_period, capture_period;
	/* Serialize access to opened variable */
	
spinlock_t			lock;
	
void __iomem			*regs;
	
int				irq;
	
int				opened;
	
int				reset_pin;
};


#define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)


#define ac97c_writel(chip, reg, val)			\
	__raw_writel((val), (chip)->regs + AC97C_##reg)

#define ac97c_readl(chip, reg)				\
	__raw_readl((chip)->regs + AC97C_##reg)

/* This function is called by the DMA driver. */

static void atmel_ac97c_dma_playback_period_done(void *arg) { struct atmel_ac97c *chip = arg; snd_pcm_period_elapsed(chip->playback_substream); }

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static void atmel_ac97c_dma_capture_period_done(void *arg) { struct atmel_ac97c *chip = arg; snd_pcm_period_elapsed(chip->capture_substream); }

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static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip, struct snd_pcm_substream *substream, enum dma_transfer_direction direction) { struct dma_chan *chan; struct dw_cyclic_desc *cdesc; struct snd_pcm_runtime *runtime = substream->runtime; unsigned long buffer_len, period_len; /* * We don't do DMA on "complex" transfers, i.e. with * non-halfword-aligned buffers or lengths. */ if (runtime->dma_addr & 1 || runtime->buffer_size & 1) { dev_dbg(&chip->pdev->dev, "too complex transfer\n"); return -EINVAL; } if (direction == DMA_MEM_TO_DEV) chan = chip->dma.tx_chan; else chan = chip->dma.rx_chan; buffer_len = frames_to_bytes(runtime, runtime->buffer_size); period_len = frames_to_bytes(runtime, runtime->period_size); cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len, period_len, direction); if (IS_ERR(cdesc)) { dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n"); return PTR_ERR(cdesc); } if (direction == DMA_MEM_TO_DEV) { cdesc->period_callback = atmel_ac97c_dma_playback_period_done; set_bit(DMA_TX_READY, &chip->flags); } else { cdesc->period_callback = atmel_ac97c_dma_capture_period_done; set_bit(DMA_RX_READY, &chip->flags); } cdesc->period_callback_param = chip; return 0; }

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static struct snd_pcm_hardware atmel_ac97c_hw = { .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_JOINT_DUPLEX | SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_PAUSE), .formats = (SNDRV_PCM_FMTBIT_S16_BE | SNDRV_PCM_FMTBIT_S16_LE), .rates = (SNDRV_PCM_RATE_CONTINUOUS), .rate_min = 4000, .rate_max = 48000, .channels_min = 1, .channels_max = 2, .buffer_bytes_max = 2 * 2 * 64 * 2048, .period_bytes_min = 4096, .period_bytes_max = 4096, .periods_min = 6, .periods_max = 64, };
static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; mutex_lock(&opened_mutex); chip->opened++; runtime->hw = atmel_ac97c_hw; if (chip->cur_rate) { runtime->hw.rate_min = chip->cur_rate; runtime->hw.rate_max = chip->cur_rate; } if (chip->cur_format) runtime->hw.formats = pcm_format_to_bits(chip->cur_format); mutex_unlock(&opened_mutex); chip->playback_substream = substream; return 0; }

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static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; mutex_lock(&opened_mutex); chip->opened++; runtime->hw = atmel_ac97c_hw; if (chip->cur_rate) { runtime->hw.rate_min = chip->cur_rate; runtime->hw.rate_max = chip->cur_rate; } if (chip->cur_format) runtime->hw.formats = pcm_format_to_bits(chip->cur_format); mutex_unlock(&opened_mutex); chip->capture_substream = substream; return 0; }

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static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); mutex_lock(&opened_mutex); chip->opened--; if (!chip->opened) { chip->cur_rate = 0; chip->cur_format = 0; } mutex_unlock(&opened_mutex); chip->playback_substream = NULL; return 0; }

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static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); mutex_lock(&opened_mutex); chip->opened--; if (!chip->opened) { chip->cur_rate = 0; chip->cur_format = 0; } mutex_unlock(&opened_mutex); chip->capture_substream = NULL; return 0; }

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static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); int retval; retval = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)); if (retval < 0) return retval; /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ if (cpu_is_at32ap7000()) { /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ if (retval == 1) if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) dw_dma_cyclic_free(chip->dma.tx_chan); } /* Set restrictions to params. */ mutex_lock(&opened_mutex); chip->cur_rate = params_rate(hw_params); chip->cur_format = params_format(hw_params); mutex_unlock(&opened_mutex); return retval; }

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static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); int retval; retval = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)); if (retval < 0) return retval; /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ if (cpu_is_at32ap7000() && retval == 1) if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) dw_dma_cyclic_free(chip->dma.rx_chan); /* Set restrictions to params. */ mutex_lock(&opened_mutex); chip->cur_rate = params_rate(hw_params); chip->cur_format = params_format(hw_params); mutex_unlock(&opened_mutex); return retval; }

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static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); if (cpu_is_at32ap7000()) { if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) dw_dma_cyclic_free(chip->dma.tx_chan); } return snd_pcm_lib_free_pages(substream); }

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static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); if (cpu_is_at32ap7000()) { if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) dw_dma_cyclic_free(chip->dma.rx_chan); } return snd_pcm_lib_free_pages(substream); }

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static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; int block_size = frames_to_bytes(runtime, runtime->period_size); unsigned long word = ac97c_readl(chip, OCA); int retval; chip->playback_period = 0; word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); /* assign channels to AC97C channel A */ switch (runtime->channels) { case 1: word |= AC97C_CH_ASSIGN(PCM_LEFT, A); break; case 2: word |= AC97C_CH_ASSIGN(PCM_LEFT, A) | AC97C_CH_ASSIGN(PCM_RIGHT, A); break; default: /* TODO: support more than two channels */ return -EINVAL; } ac97c_writel(chip, OCA, word); /* configure sample format and size */ word = ac97c_readl(chip, CAMR); if (chip->opened <= 1) word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; else word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; switch (runtime->format) { case SNDRV_PCM_FORMAT_S16_LE: if (cpu_is_at32ap7000()) word |= AC97C_CMR_CEM_LITTLE; break; case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ word &= ~(AC97C_CMR_CEM_LITTLE); break; default: word = ac97c_readl(chip, OCA); word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); ac97c_writel(chip, OCA, word); return -EINVAL; } /* Enable underrun interrupt on channel A */ word |= AC97C_CSR_UNRUN; ac97c_writel(chip, CAMR, word); /* Enable channel A event interrupt */ word = ac97c_readl(chip, IMR); word |= AC97C_SR_CAEVT; ac97c_writel(chip, IER, word); /* set variable rate if needed */ if (runtime->rate != 48000) { word = ac97c_readl(chip, MR); word |= AC97C_MR_VRA; ac97c_writel(chip, MR, word); } else { word = ac97c_readl(chip, MR); word &= ~(AC97C_MR_VRA); ac97c_writel(chip, MR, word); } retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate); if (retval) dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", runtime->rate); if (cpu_is_at32ap7000()) { if (!test_bit(DMA_TX_READY, &chip->flags)) retval = atmel_ac97c_prepare_dma(chip, substream, DMA_MEM_TO_DEV); } else { /* Initialize and start the PDC */ writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR); writel(block_size / 2, chip->regs + ATMEL_PDC_TCR); writel(runtime->dma_addr + block_size, chip->regs + ATMEL_PDC_TNPR); writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR); } return retval; }

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static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; int block_size = frames_to_bytes(runtime, runtime->period_size); unsigned long word = ac97c_readl(chip, ICA); int retval; chip->capture_period = 0; word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); /* assign channels to AC97C channel A */ switch (runtime->channels) { case 1: word |= AC97C_CH_ASSIGN(PCM_LEFT, A); break; case 2: word |= AC97C_CH_ASSIGN(PCM_LEFT, A) | AC97C_CH_ASSIGN(PCM_RIGHT, A); break; default: /* TODO: support more than two channels */ return -EINVAL; } ac97c_writel(chip, ICA, word); /* configure sample format and size */ word = ac97c_readl(chip, CAMR); if (chip->opened <= 1) word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; else word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; switch (runtime->format) { case SNDRV_PCM_FORMAT_S16_LE: if (cpu_is_at32ap7000()) word |= AC97C_CMR_CEM_LITTLE; break; case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ word &= ~(AC97C_CMR_CEM_LITTLE); break; default: word = ac97c_readl(chip, ICA); word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); ac97c_writel(chip, ICA, word); return -EINVAL; } /* Enable overrun interrupt on channel A */ word |= AC97C_CSR_OVRUN; ac97c_writel(chip, CAMR, word); /* Enable channel A event interrupt */ word = ac97c_readl(chip, IMR); word |= AC97C_SR_CAEVT; ac97c_writel(chip, IER, 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 (cpu_is_at32ap7000()) { if (!test_bit(DMA_RX_READY, &chip->flags)) retval = atmel_ac97c_prepare_dma(chip, substream, DMA_DEV_TO_MEM); } else { /* Initialize and start the PDC */ writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR); writel(block_size / 2, chip->regs + ATMEL_PDC_RCR); writel(runtime->dma_addr + block_size, chip->regs + ATMEL_PDC_RNPR); writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR); } return retval; }

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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, ptcr = 0; 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: if (cpu_is_at32ap7000()) { retval = dw_dma_cyclic_start(chip->dma.tx_chan); if (retval) goto out; } else { ptcr = ATMEL_PDC_TXTEN; } camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX; break; case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ case SNDRV_PCM_TRIGGER_STOP: if (cpu_is_at32ap7000()) dw_dma_cyclic_stop(chip->dma.tx_chan); else ptcr |= ATMEL_PDC_TXTDIS; if (chip->opened <= 1) camr &= ~AC97C_CMR_CENA; break; default: retval = -EINVAL; goto out; } ac97c_writel(chip, CAMR, camr); if (!cpu_is_at32ap7000()) writel(ptcr, chip->regs + ATMEL_PDC_PTCR); out: return retval; }

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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, ptcr = 0; int retval = 0; camr = ac97c_readl(chip, CAMR); ptcr = readl(chip->regs + ATMEL_PDC_PTSR); switch (cmd) { case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ case SNDRV_PCM_TRIGGER_START: if (cpu_is_at32ap7000()) { retval = dw_dma_cyclic_start(chip->dma.rx_chan); if (retval) goto out; } else { ptcr = ATMEL_PDC_RXTEN; } camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX; break; case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ case SNDRV_PCM_TRIGGER_STOP: if (cpu_is_at32ap7000()) dw_dma_cyclic_stop(chip->dma.rx_chan); else ptcr |= (ATMEL_PDC_RXTDIS); if (chip->opened <= 1) camr &= ~AC97C_CMR_CENA; break; default: retval = -EINVAL; break; } ac97c_writel(chip, CAMR, camr); if (!cpu_is_at32ap7000()) writel(ptcr, chip->regs + ATMEL_PDC_PTCR); out: return retval; }

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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; if (cpu_is_at32ap7000()) bytes = dw_dma_get_src_addr(chip->dma.tx_chan); else bytes = readl(chip->regs + ATMEL_PDC_TPR); bytes -= runtime->dma_addr; frames = bytes_to_frames(runtime, bytes); if (frames >= runtime->buffer_size) frames -= runtime->buffer_size; return frames; }

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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; if (cpu_is_at32ap7000()) bytes = dw_dma_get_dst_addr(chip->dma.rx_chan); else bytes = readl(chip->regs + ATMEL_PDC_RPR); bytes -= runtime->dma_addr; frames = bytes_to_frames(runtime, bytes); if (frames >= runtime->buffer_size) frames -= runtime->buffer_size; return frames; }

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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