From e4967d6016b7785edafdb871e6d3e4426cb4bd1f Mon Sep 17 00:00:00 2001 From: Hans-Christian Egtvedt Date: Thu, 5 Feb 2009 13:10:59 +0100 Subject: ALSA: Add ALSA driver for Atmel Audio Bitstream DAC This patch adds ALSA support for the Audio Bistream DAC found on Atmel AVR32 devices. The ABDAC is an Atmel IP which might show up on AT91 devices in the future, hence making a generic driver which can be utilized by AT91 arch if needed. Datasheet describing the ABDAC peripheral is available in the AT32AP7000 datasheet, http://www.atmel.com/dyn/products/datasheets.asp?family_id=682 Tested on ATSTK1006 + ATSTK1000 with a class D amplifier stage. Signed-off-by: Hans-Christian Egtvedt Signed-off-by: Takashi Iwai --- sound/atmel/Kconfig | 11 + sound/atmel/Makefile | 3 + sound/atmel/abdac.c | 602 +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 616 insertions(+) create mode 100644 sound/atmel/Kconfig create mode 100644 sound/atmel/Makefile create mode 100644 sound/atmel/abdac.c (limited to 'sound/atmel') diff --git a/sound/atmel/Kconfig b/sound/atmel/Kconfig new file mode 100644 index 000000000000..715318e3670f --- /dev/null +++ b/sound/atmel/Kconfig @@ -0,0 +1,11 @@ +menu "Atmel devices (AVR32 and AT91)" + depends on AVR32 || ARCH_AT91 + +config SND_ATMEL_ABDAC + tristate "Atmel Audio Bitstream DAC (ABDAC) driver" + select SND_PCM + depends on DW_DMAC && AVR32 + help + ALSA sound driver for the Atmel Audio Bitstream DAC (ABDAC). + +endmenu diff --git a/sound/atmel/Makefile b/sound/atmel/Makefile new file mode 100644 index 000000000000..c5a8213f9cb9 --- /dev/null +++ b/sound/atmel/Makefile @@ -0,0 +1,3 @@ +snd-atmel-abdac-objs := abdac.o + +obj-$(CONFIG_SND_ATMEL_ABDAC) += snd-atmel-abdac.o diff --git a/sound/atmel/abdac.c b/sound/atmel/abdac.c new file mode 100644 index 000000000000..28b3c7f7cfe6 --- /dev/null +++ b/sound/atmel/abdac.c @@ -0,0 +1,602 @@ +/* + * Driver for the Atmel on-chip Audio Bitstream DAC (ABDAC) + * + * Copyright (C) 2006-2009 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +/* DAC register offsets */ +#define DAC_DATA 0x0000 +#define DAC_CTRL 0x0008 +#define DAC_INT_MASK 0x000c +#define DAC_INT_EN 0x0010 +#define DAC_INT_DIS 0x0014 +#define DAC_INT_CLR 0x0018 +#define DAC_INT_STATUS 0x001c + +/* Bitfields in CTRL */ +#define DAC_SWAP_OFFSET 30 +#define DAC_SWAP_SIZE 1 +#define DAC_EN_OFFSET 31 +#define DAC_EN_SIZE 1 + +/* Bitfields in INT_MASK/INT_EN/INT_DIS/INT_STATUS/INT_CLR */ +#define DAC_UNDERRUN_OFFSET 28 +#define DAC_UNDERRUN_SIZE 1 +#define DAC_TX_READY_OFFSET 29 +#define DAC_TX_READY_SIZE 1 + +/* Bit manipulation macros */ +#define DAC_BIT(name) \ + (1 << DAC_##name##_OFFSET) +#define DAC_BF(name, value) \ + (((value) & ((1 << DAC_##name##_SIZE) - 1)) \ + << DAC_##name##_OFFSET) +#define DAC_BFEXT(name, value) \ + (((value) >> DAC_##name##_OFFSET) \ + & ((1 << DAC_##name##_SIZE) - 1)) +#define DAC_BFINS(name, value, old) \ + (((old) & ~(((1 << DAC_##name##_SIZE) - 1) \ + << DAC_##name##_OFFSET)) \ + | DAC_BF(name, value)) + +/* Register access macros */ +#define dac_readl(port, reg) \ + __raw_readl((port)->regs + DAC_##reg) +#define dac_writel(port, reg, value) \ + __raw_writel((value), (port)->regs + DAC_##reg) + +/* + * ABDAC supports a maximum of 6 different rates from a generic clock. The + * generic clock has a power of two divider, which gives 6 steps from 192 kHz + * to 5112 Hz. + */ +#define MAX_NUM_RATES 6 +/* ALSA seems to use rates between 192000 Hz and 5112 Hz. */ +#define RATE_MAX 192000 +#define RATE_MIN 5112 + +enum { + DMA_READY = 0, +}; + +struct atmel_abdac_dma { + struct dma_chan *chan; + struct dw_cyclic_desc *cdesc; +}; + +struct atmel_abdac { + struct clk *pclk; + struct clk *sample_clk; + struct platform_device *pdev; + struct atmel_abdac_dma dma; + + struct snd_pcm_hw_constraint_list constraints_rates; + struct snd_pcm_substream *substream; + struct snd_card *card; + struct snd_pcm *pcm; + + void __iomem *regs; + unsigned long flags; + unsigned int rates[MAX_NUM_RATES]; + unsigned int rates_num; + int irq; +}; + +#define get_dac(card) ((struct atmel_abdac *)(card)->private_data) + +/* This function is called by the DMA driver. */ +static void atmel_abdac_dma_period_done(void *arg) +{ + struct atmel_abdac *dac = arg; + snd_pcm_period_elapsed(dac->substream); +} + +static int atmel_abdac_prepare_dma(struct atmel_abdac *dac, + struct snd_pcm_substream *substream, + enum dma_data_direction direction) +{ + struct dma_chan *chan = dac->dma.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(&dac->pdev->dev, "too complex transfer\n"); + return -EINVAL; + } + + 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, DMA_TO_DEVICE); + if (IS_ERR(cdesc)) { + dev_dbg(&dac->pdev->dev, "could not prepare cyclic DMA\n"); + return PTR_ERR(cdesc); + } + + cdesc->period_callback = atmel_abdac_dma_period_done; + cdesc->period_callback_param = dac; + + dac->dma.cdesc = cdesc; + + set_bit(DMA_READY, &dac->flags); + + return 0; +} + +static struct snd_pcm_hardware atmel_abdac_hw = { + .info = (SNDRV_PCM_INFO_MMAP + | SNDRV_PCM_INFO_MMAP_VALID + | SNDRV_PCM_INFO_INTERLEAVED + | SNDRV_PCM_INFO_BLOCK_TRANSFER + | SNDRV_PCM_INFO_RESUME + | SNDRV_PCM_INFO_PAUSE), + .formats = (SNDRV_PCM_FMTBIT_S16_BE), + .rates = (SNDRV_PCM_RATE_KNOT), + .rate_min = RATE_MIN, + .rate_max = RATE_MAX, + .channels_min = 2, + .channels_max = 2, + .buffer_bytes_max = 64 * 4096, + .period_bytes_min = 4096, + .period_bytes_max = 4096, + .periods_min = 4, + .periods_max = 64, +}; + +static int atmel_abdac_open(struct snd_pcm_substream *substream) +{ + struct atmel_abdac *dac = snd_pcm_substream_chip(substream); + + dac->substream = substream; + atmel_abdac_hw.rate_max = dac->rates[dac->rates_num - 1]; + atmel_abdac_hw.rate_min = dac->rates[0]; + substream->runtime->hw = atmel_abdac_hw; + + return snd_pcm_hw_constraint_list(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, &dac->constraints_rates); +} + +static int atmel_abdac_close(struct snd_pcm_substream *substream) +{ + struct atmel_abdac *dac = snd_pcm_substream_chip(substream); + dac->substream = NULL; + return 0; +} + +static int atmel_abdac_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *hw_params) +{ + struct atmel_abdac *dac = 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 (retval == 1) + if (test_and_clear_bit(DMA_READY, &dac->flags)) + dw_dma_cyclic_free(dac->dma.chan); + + return retval; +} + +static int atmel_abdac_hw_free(struct snd_pcm_substream *substream) +{ + struct atmel_abdac *dac = snd_pcm_substream_chip(substream); + if (test_and_clear_bit(DMA_READY, &dac->flags)) + dw_dma_cyclic_free(dac->dma.chan); + return snd_pcm_lib_free_pages(substream); +} + +static int atmel_abdac_prepare(struct snd_pcm_substream *substream) +{ + struct atmel_abdac *dac = snd_pcm_substream_chip(substream); + int retval; + + retval = clk_set_rate(dac->sample_clk, 256 * substream->runtime->rate); + if (retval) + return retval; + + if (!test_bit(DMA_READY, &dac->flags)) + retval = atmel_abdac_prepare_dma(dac, substream, DMA_TO_DEVICE); + + return retval; +} + +static int atmel_abdac_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct atmel_abdac *dac = snd_pcm_substream_chip(substream); + int retval = 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ + case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ + case SNDRV_PCM_TRIGGER_START: + clk_enable(dac->sample_clk); + retval = dw_dma_cyclic_start(dac->dma.chan); + if (retval) + goto out; + dac_writel(dac, CTRL, DAC_BIT(EN)); + 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(dac->dma.chan); + dac_writel(dac, DATA, 0); + dac_writel(dac, CTRL, 0); + clk_disable(dac->sample_clk); + break; + default: + retval = -EINVAL; + break; + } +out: + return retval; +} + +static snd_pcm_uframes_t +atmel_abdac_pointer(struct snd_pcm_substream *substream) +{ + struct atmel_abdac *dac = 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(dac->dma.chan); + bytes -= runtime->dma_addr; + + frames = bytes_to_frames(runtime, bytes); + if (frames >= runtime->buffer_size) + frames -= runtime->buffer_size; + + return frames; +} + +static irqreturn_t abdac_interrupt(int irq, void *dev_id) +{ + struct atmel_abdac *dac = dev_id; + u32 status; + + status = dac_readl(dac, INT_STATUS); + if (status & DAC_BIT(UNDERRUN)) { + dev_err(&dac->pdev->dev, "underrun detected\n"); + dac_writel(dac, INT_CLR, DAC_BIT(UNDERRUN)); + } else { + dev_err(&dac->pdev->dev, "spurious interrupt (status=0x%x)\n", + status); + dac_writel(dac, INT_CLR, status); + } + + return IRQ_HANDLED; +} + +static struct snd_pcm_ops atmel_abdac_ops = { + .open = atmel_abdac_open, + .close = atmel_abdac_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = atmel_abdac_hw_params, + .hw_free = atmel_abdac_hw_free, + .prepare = atmel_abdac_prepare, + .trigger = atmel_abdac_trigger, + .pointer = atmel_abdac_pointer, +}; + +static int __devinit atmel_abdac_pcm_new(struct atmel_abdac *dac) +{ + struct snd_pcm_hardware hw = atmel_abdac_hw; + struct snd_pcm *pcm; + int retval; + + retval = snd_pcm_new(dac->card, dac->card->shortname, + dac->pdev->id, 1, 0, &pcm); + if (retval) + return retval; + + strcpy(pcm->name, dac->card->shortname); + pcm->private_data = dac; + pcm->info_flags = 0; + dac->pcm = pcm; + + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &atmel_abdac_ops); + + retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, + &dac->pdev->dev, hw.periods_min * hw.period_bytes_min, + hw.buffer_bytes_max); + + return retval; +} + +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 int set_sample_rates(struct atmel_abdac *dac) +{ + long new_rate = RATE_MAX; + int retval = -EINVAL; + int index = 0; + + /* we start at 192 kHz and work our way down to 5112 Hz */ + while (new_rate >= RATE_MIN && index < (MAX_NUM_RATES + 1)) { + new_rate = clk_round_rate(dac->sample_clk, 256 * new_rate); + if (new_rate < 0) + break; + /* make sure we are below the ABDAC clock */ + if (new_rate <= clk_get_rate(dac->pclk)) { + dac->rates[index] = new_rate / 256; + index++; + } + /* divide by 256 and then by two to get next rate */ + new_rate /= 256 * 2; + } + + if (index) { + int i; + + /* reverse array, smallest go first */ + for (i = 0; i < (index / 2); i++) { + unsigned int tmp = dac->rates[index - 1 - i]; + dac->rates[index - 1 - i] = dac->rates[i]; + dac->rates[i] = tmp; + } + + dac->constraints_rates.count = index; + dac->constraints_rates.list = dac->rates; + dac->constraints_rates.mask = 0; + dac->rates_num = index; + + retval = 0; + } + + return retval; +} + +static int __devinit atmel_abdac_probe(struct platform_device *pdev) +{ + struct snd_card *card; + struct atmel_abdac *dac; + struct resource *regs; + struct atmel_abdac_pdata *pdata; + struct clk *pclk; + struct clk *sample_clk; + 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 number\n"); + return irq; + } + + 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); + } + sample_clk = clk_get(&pdev->dev, "sample_clk"); + if (IS_ERR(pclk)) { + dev_dbg(&pdev->dev, "no sample clock\n"); + retval = PTR_ERR(pclk); + goto out_put_pclk; + } + clk_enable(pclk); + + retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, + THIS_MODULE, sizeof(struct atmel_abdac), &card); + if (retval) { + dev_dbg(&pdev->dev, "could not create sound card device\n"); + goto out_put_sample_clk; + } + + dac = get_dac(card); + + dac->irq = irq; + dac->card = card; + dac->pclk = pclk; + dac->sample_clk = sample_clk; + dac->pdev = pdev; + + retval = set_sample_rates(dac); + if (retval < 0) { + dev_dbg(&pdev->dev, "could not set supported rates\n"); + goto out_free_card; + } + + dac->regs = ioremap(regs->start, regs->end - regs->start + 1); + if (!dac->regs) { + dev_dbg(&pdev->dev, "could not remap register memory\n"); + goto out_free_card; + } + + /* make sure the DAC is silent and disabled */ + dac_writel(dac, DATA, 0); + dac_writel(dac, CTRL, 0); + + retval = request_irq(irq, abdac_interrupt, 0, "abdac", dac); + if (retval) { + dev_dbg(&pdev->dev, "could not request irq\n"); + goto out_unmap_regs; + } + + snd_card_set_dev(card, &pdev->dev); + + if (pdata->dws.dma_dev) { + struct dw_dma_slave *dws = &pdata->dws; + dma_cap_mask_t mask; + + dws->tx_reg = regs->start + DAC_DATA; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + dac->dma.chan = dma_request_channel(mask, filter, dws); + } + if (!pdata->dws.dma_dev || !dac->dma.chan) { + dev_dbg(&pdev->dev, "DMA not available\n"); + retval = -ENODEV; + goto out_unset_card_dev; + } + + strcpy(card->driver, "Atmel ABDAC"); + strcpy(card->shortname, "Atmel ABDAC"); + sprintf(card->longname, "Atmel Audio Bitstream DAC"); + + retval = atmel_abdac_pcm_new(dac); + if (retval) { + dev_dbg(&pdev->dev, "could not register ABDAC pcm device\n"); + goto out_release_dma; + } + + retval = snd_card_register(card); + if (retval) { + dev_dbg(&pdev->dev, "could not register sound card\n"); + goto out_release_dma; + } + + platform_set_drvdata(pdev, card); + + dev_info(&pdev->dev, "Atmel ABDAC at 0x%p using %s\n", + dac->regs, dac->dma.chan->dev->device.bus_id); + + return retval; + +out_release_dma: + dma_release_channel(dac->dma.chan); + dac->dma.chan = NULL; +out_unset_card_dev: + snd_card_set_dev(card, NULL); + free_irq(irq, dac); +out_unmap_regs: + iounmap(dac->regs); +out_free_card: + snd_card_free(card); +out_put_sample_clk: + clk_put(sample_clk); + clk_disable(pclk); +out_put_pclk: + clk_put(pclk); + return retval; +} + +#ifdef CONFIG_PM +static int atmel_abdac_suspend(struct platform_device *pdev, pm_message_t msg) +{ + struct snd_card *card = platform_get_drvdata(pdev); + struct atmel_abdac *dac = card->private_data; + + dw_dma_cyclic_stop(dac->dma.chan); + clk_disable(dac->sample_clk); + clk_disable(dac->pclk); + + return 0; +} + +static int atmel_abdac_resume(struct platform_device *pdev) +{ + struct snd_card *card = platform_get_drvdata(pdev); + struct atmel_abdac *dac = card->private_data; + + clk_enable(dac->pclk); + clk_enable(dac->sample_clk); + if (test_bit(DMA_READY, &dac->flags)) + dw_dma_cyclic_start(dac->dma.chan); + + return 0; +} +#else +#define atmel_abdac_suspend NULL +#define atmel_abdac_resume NULL +#endif + +static int __devexit atmel_abdac_remove(struct platform_device *pdev) +{ + struct snd_card *card = platform_get_drvdata(pdev); + struct atmel_abdac *dac = get_dac(card); + + clk_put(dac->sample_clk); + clk_disable(dac->pclk); + clk_put(dac->pclk); + + dma_release_channel(dac->dma.chan); + dac->dma.chan = NULL; + snd_card_set_dev(card, NULL); + iounmap(dac->regs); + free_irq(dac->irq, dac); + snd_card_free(card); + + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct platform_driver atmel_abdac_driver = { + .remove = __devexit_p(atmel_abdac_remove), + .driver = { + .name = "atmel_abdac", + }, + .suspend = atmel_abdac_suspend, + .resume = atmel_abdac_resume, +}; + +static int __init atmel_abdac_init(void) +{ + return platform_driver_probe(&atmel_abdac_driver, + atmel_abdac_probe); +} +module_init(atmel_abdac_init); + +static void __exit atmel_abdac_exit(void) +{ + platform_driver_unregister(&atmel_abdac_driver); +} +module_exit(atmel_abdac_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Driver for Atmel Audio Bitstream DAC (ABDAC)"); +MODULE_AUTHOR("Hans-Christian Egtvedt "); -- cgit v1.2.3 From 4ede028f8716523fc31e0d3d01b81405613dfb8f Mon Sep 17 00:00:00 2001 From: Hans-Christian Egtvedt Date: Thu, 5 Feb 2009 13:11:00 +0100 Subject: 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 Signed-off-by: Takashi Iwai --- sound/atmel/Kconfig | 8 + sound/atmel/Makefile | 2 + sound/atmel/ac97c.c | 932 +++++++++++++++++++++++++++++++++++++++++++++++++++ sound/atmel/ac97c.h | 71 ++++ 4 files changed, 1013 insertions(+) create mode 100644 sound/atmel/ac97c.c create mode 100644 sound/atmel/ac97c.h (limited to 'sound/atmel') diff --git a/sound/atmel/Kconfig b/sound/atmel/Kconfig index 715318e3670f..6c228a91940d 100644 --- a/sound/atmel/Kconfig +++ b/sound/atmel/Kconfig @@ -8,4 +8,12 @@ config SND_ATMEL_ABDAC help ALSA sound driver for the Atmel Audio Bitstream DAC (ABDAC). +config SND_ATMEL_AC97C + tristate "Atmel AC97 Controller (AC97C) driver" + select SND_PCM + select SND_AC97_CODEC + depends on DW_DMAC && AVR32 + help + ALSA sound driver for the Atmel AC97 controller. + endmenu diff --git a/sound/atmel/Makefile b/sound/atmel/Makefile index c5a8213f9cb9..219dcfac6086 100644 --- a/sound/atmel/Makefile +++ b/sound/atmel/Makefile @@ -1,3 +1,5 @@ snd-atmel-abdac-objs := abdac.o +snd-atmel-ac97c-objs := ac97c.o obj-$(CONFIG_SND_ATMEL_ABDAC) += snd-atmel-abdac.o +obj-$(CONFIG_SND_ATMEL_AC97C) += snd-atmel-ac97c.o diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c new file mode 100644 index 000000000000..dd72e00e5ae1 --- /dev/null +++ b/sound/atmel/ac97c.c @@ -0,0 +1,932 @@ +/* + * Driver 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. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include + +#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; + /* Serialize access to opened variable */ + spinlock_t lock; + void __iomem *regs; + 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); +} + +static void atmel_ac97c_dma_capture_period_done(void *arg) +{ + struct atmel_ac97c *chip = arg; + snd_pcm_period_elapsed(chip->capture_substream); +} + +static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip, + struct snd_pcm_substream *substream, + enum dma_data_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_TO_DEVICE) + 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_TO_DEVICE) { + 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; +} + +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 = 64 * 4096, + .period_bytes_min = 4096, + .period_bytes_max = 4096, + .periods_min = 4, + .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 = (1ULL << chip->cur_format); + mutex_unlock(&opened_mutex); + chip->playback_substream = substream; + return 0; +} + +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 = (1ULL << chip->cur_format); + mutex_unlock(&opened_mutex); + chip->capture_substream = substream; + return 0; +} + +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; +} + +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; +} + +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 (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; +} + +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 (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; +} + +static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream) +{ + struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); + 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 (test_and_clear_bit(DMA_RX_READY, &chip->flags)) + dw_dma_cyclic_free(chip->dma.rx_chan); + return snd_pcm_lib_free_pages(substream); +} + +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; + unsigned long word = 0; + int retval; + + /* 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; + break; + } + ac97c_writel(chip, OCA, word); + + /* configure sample format and size */ + word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; + + switch (runtime->format) { + case SNDRV_PCM_FORMAT_S16_LE: + word |= AC97C_CMR_CEM_LITTLE; + break; + case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ + default: + word &= ~(AC97C_CMR_CEM_LITTLE); + break; + } + + 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_FRONT_DAC_RATE, + runtime->rate); + if (retval) + dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", + runtime->rate); + + if (!test_bit(DMA_TX_READY, &chip->flags)) + retval = atmel_ac97c_prepare_dma(chip, substream, + DMA_TO_DEVICE); + + return retval; +} + +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; + unsigned long word = 0; + int retval; + + /* 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; + break; + } + ac97c_writel(chip, ICA, word); + + /* configure sample format and size */ + word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; + + switch (runtime->format) { + case SNDRV_PCM_FORMAT_S16_LE: + word |= AC97C_CMR_CEM_LITTLE; + break; + case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ + default: + word &= ~(AC97C_CMR_CEM_LITTLE); + break; + } + + 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 "); diff --git a/sound/atmel/ac97c.h b/sound/atmel/ac97c.h new file mode 100644 index 000000000000..c17bd5825980 --- /dev/null +++ b/sound/atmel/ac97c.h @@ -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 */ -- cgit v1.2.3