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Commit 7177395f authored by Sedji Gaouaou's avatar Sedji Gaouaou Committed by Takashi Iwai
Browse files

ALSA: AC97: add AC97 support for AT91. 



This patch add AC97 support for ATMEL AT91, using the AVR32 code.
While AVR is using a DMA, the AT91 chips are using a Peripheral Data
Controller.

Signed-off-by: default avatarSedji Gaouaou <sedji.gaouaou@atmel.com>
Acked-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
Acked-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent ae761481

sound/atmel/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -12,7 +12,7 @@ config SND_ATMEL_AC97C 
	tristate "Atmel AC97 Controller (AC97C) driver"

	select SND_PCM

	select SND_AC97_CODEC

	depends on DW_DMAC && AVR32

	depends on (DW_DMAC && AVR32) || ARCH_AT91

	help

	  ALSA sound driver for the Atmel AC97 controller.

sound/atmel/ac97c.c

+254 −85
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#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>
@@ -31,6 +32,10 @@ 


#include <linux/dw_dmac.h>



#include <mach/cpu.h>

#include <mach/hardware.h>

#include <mach/gpio.h>



#include "ac97c.h"



enum {
@@ -63,6 +68,7 @@ struct atmel_ac97c { 
	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;
@@ -242,10 +248,12 @@ static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream, 
	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);
@@ -266,9 +274,14 @@ static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, 
	if (retval < 0)

		return retval;

	/* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */

	if (cpu_is_at32ap7000()) {

		if (retval < 0)

			return retval;

		/* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */

		if (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);
@@ -282,16 +295,20 @@ static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, 
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);

}



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);

}
@@ -299,9 +316,11 @@ 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 */
@@ -324,6 +343,7 @@ static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) 


	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 */
@@ -363,9 +383,18 @@ static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) 
		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_TO_DEVICE);

	} 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;

}
@@ -374,9 +403,11 @@ 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 */
@@ -399,6 +430,7 @@ static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) 


	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 */
@@ -438,9 +470,18 @@ static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) 
		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_FROM_DEVICE);

	} 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;

}
@@ -449,7 +490,7 @@ 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;

	unsigned long camr, ptcr = 0;

	int retval = 0;



	camr = ac97c_readl(chip, CAMR);
@@ -458,15 +499,22 @@ atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int 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;

		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;
@@ -476,6 +524,8 @@ atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) 
	}



	ac97c_writel(chip, CAMR, camr);

	if (!cpu_is_at32ap7000())

		writel(ptcr, chip->regs + ATMEL_PDC_PTCR);

out:

	return retval;

}
@@ -484,24 +534,32 @@ 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;

	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;

		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;
@@ -511,6 +569,8 @@ atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) 
	}



	ac97c_writel(chip, CAMR, camr);

	if (!cpu_is_at32ap7000())

		writel(ptcr, chip->regs + ATMEL_PDC_PTCR);

out:

	return retval;

}
@@ -523,7 +583,10 @@ atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream) 
	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);
@@ -540,7 +603,10 @@ atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) 
	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);
@@ -578,8 +644,11 @@ static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) 
	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_info(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",

				casr & AC97C_CSR_OVRUN   ? " OVRUN"   : "",

				casr & AC97C_CSR_RXRDY   ? " RXRDY"   : "",
@@ -587,6 +656,50 @@ static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) 
				casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",

				casr & AC97C_CSR_TXRDY   ? " TXRDY"   : "",

				!casr                    ? " NONE"    : "");

		if (!cpu_is_at32ap7000()) {

			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;

	}
@@ -608,15 +721,50 @@ static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) 
	return retval;

}



static struct ac97_pcm at91_ac97_pcm_defs[] __devinitdata = {

	/* 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 __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;

	int			capture, playback, retval, err;



	capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);

	playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);



	if (!cpu_is_at32ap7000()) {

		err = snd_ac97_pcm_assign(chip->ac97_bus,

				ARRAY_SIZE(at91_ac97_pcm_defs),

				at91_ac97_pcm_defs);

		if (err)

			return err;

	}

	retval = snd_pcm_new(chip->card, chip->card->shortname,

			chip->pdev->id, playback, capture, &pcm);

	if (retval)
@@ -775,7 +923,12 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev) 
		return -ENXIO;

	}



	if (cpu_is_at32ap7000()) {

		pclk = clk_get(&pdev->dev, "pclk");

	} else {

		pclk = clk_get(&pdev->dev, "ac97_clk");

	}



	if (IS_ERR(pclk)) {

		dev_dbg(&pdev->dev, "no peripheral clock\n");

		return PTR_ERR(pclk);
@@ -844,6 +997,7 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev) 
		goto err_ac97_bus;

	}



	if (cpu_is_at32ap7000()) {

		if (pdata->rx_dws.dma_dev) {

			struct dw_dma_slave *dws = &pdata->rx_dws;

			dma_cap_mask_t mask;
@@ -853,7 +1007,8 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev) 
			dma_cap_zero(mask);

			dma_cap_set(DMA_SLAVE, mask);



		chip->dma.rx_chan = dma_request_channel(mask, filter, dws);

			chip->dma.rx_chan = dma_request_channel(mask, filter,

								dws);



			dev_info(&chip->pdev->dev, "using %s for DMA RX\n",

				dev_name(&chip->dma.rx_chan->dev->device));
@@ -869,7 +1024,8 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev) 
			dma_cap_zero(mask);

			dma_cap_set(DMA_SLAVE, mask);



		chip->dma.tx_chan = dma_request_channel(mask, filter, dws);

			chip->dma.tx_chan = dma_request_channel(mask, filter,

								dws);



			dev_info(&chip->pdev->dev, "using %s for DMA TX\n",

				dev_name(&chip->dma.tx_chan->dev->device));
@@ -882,6 +1038,12 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev) 
			retval = -ENODEV;

			goto err_dma;

		}

	} else {

		/* Just pretend that we have DMA channel(for at91 i is actually

		 * the PDC) */

		set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);

		set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);

	}



	retval = atmel_ac97c_pcm_new(chip);

	if (retval) {
@@ -897,12 +1059,13 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev) 


	platform_set_drvdata(pdev, card);



	dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p\n",

			chip->regs);

	dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",

			chip->regs, irq);



	return 0;



err_dma:

	if (cpu_is_at32ap7000()) {

		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))
@@ -911,6 +1074,7 @@ err_dma: 
		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);
@@ -934,10 +1098,12 @@ 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 (cpu_is_at32ap7000()) {

		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;
@@ -949,11 +1115,12 @@ static int atmel_ac97c_resume(struct platform_device *pdev) 
	struct atmel_ac97c *chip = card->private_data;



	clk_enable(chip->pclk);

	if (cpu_is_at32ap7000()) {

		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
@@ -978,6 +1145,7 @@ static int __devexit atmel_ac97c_remove(struct platform_device *pdev) 
	iounmap(chip->regs);

	free_irq(chip->irq, chip);



	if (cpu_is_at32ap7000()) {

		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))
@@ -986,6 +1154,7 @@ static int __devexit atmel_ac97c_remove(struct platform_device *pdev) 
		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);