diff options
Diffstat (limited to 'kernel/sound/atmel/ac97c.c')
| -rw-r--r-- | kernel/sound/atmel/ac97c.c | 1251 |
1 files changed, 1251 insertions, 0 deletions
diff --git a/kernel/sound/atmel/ac97c.c b/kernel/sound/atmel/ac97c.c new file mode 100644 index 000000000..6dad04263 --- /dev/null +++ b/kernel/sound/atmel/ac97c.c @@ -0,0 +1,1251 @@ +/* + * 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); +} + +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_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; +} + +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; +} + +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; +} + +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 (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; +} + +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; +} + +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); +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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 irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) +{ + struct atmel_ac97c *chip = (struct atmel_ac97c *)dev; + irqreturn_t retval = IRQ_NONE; + u32 sr = ac97c_readl(chip, SR); + u32 casr = ac97c_readl(chip, CASR); + u32 cosr = ac97c_readl(chip, COSR); + u32 camr = ac97c_readl(chip, CAMR); + + if (sr & AC97C_SR_CAEVT) { + struct snd_pcm_runtime *runtime; + int offset, next_period, block_size; + dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n", + casr & AC97C_CSR_OVRUN ? " OVRUN" : "", + casr & AC97C_CSR_RXRDY ? " RXRDY" : "", + casr & AC97C_CSR_UNRUN ? " UNRUN" : "", + casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", + casr & AC97C_CSR_TXRDY ? " TXRDY" : "", + !casr ? " NONE" : ""); + if (!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; + } + + if (sr & AC97C_SR_COEVT) { + dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n", + cosr & AC97C_CSR_OVRUN ? " OVRUN" : "", + cosr & AC97C_CSR_RXRDY ? " RXRDY" : "", + cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", + cosr & AC97C_CSR_TXRDY ? " TXRDY" : "", + !cosr ? " NONE" : ""); + retval = IRQ_HANDLED; + } + + if (retval == IRQ_NONE) { + dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x " + "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr); + } + + return retval; +} + +static struct ac97_pcm at91_ac97_pcm_defs[] = { + /* Playback */ + { + .exclusive = 1, + .r = { { + .slots = ((1 << AC97_SLOT_PCM_LEFT) + | (1 << AC97_SLOT_PCM_RIGHT)), + } }, + }, + /* PCM in */ + { + .stream = 1, + .exclusive = 1, + .r = { { + .slots = ((1 << AC97_SLOT_PCM_LEFT) + | (1 << AC97_SLOT_PCM_RIGHT)), + } } + }, + /* Mic in */ + { + .stream = 1, + .exclusive = 1, + .r = { { + .slots = (1<<AC97_SLOT_MIC), + } } + }, +}; + +static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip) +{ + struct snd_pcm *pcm; + struct snd_pcm_hardware hw = atmel_ac97c_hw; + int 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, + 0, 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, 0); + ac97c_writel(chip, MR, AC97C_MR_ENA); + ac97c_writel(chip, CAMR, 0); + ac97c_writel(chip, COMR, 0); + + if (gpio_is_valid(chip->reset_pin)) { + gpio_set_value(chip->reset_pin, 0); + /* AC97 v2.2 specifications says minimum 1 us. */ + udelay(2); + gpio_set_value(chip->reset_pin, 1); + } else { + ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA); + udelay(2); + ac97c_writel(chip, MR, AC97C_MR_ENA); + } +} + +#ifdef CONFIG_OF +static const struct of_device_id atmel_ac97c_dt_ids[] = { + { .compatible = "atmel,at91sam9263-ac97c", }, + { } +}; +MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids); + +static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev) +{ + struct ac97c_platform_data *pdata; + struct device_node *node = dev->of_node; + + if (!node) { + dev_err(dev, "Device does not have associated DT data\n"); + return ERR_PTR(-EINVAL); + } + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + pdata->reset_pin = of_get_named_gpio(dev->of_node, "ac97-gpios", 2); + + return pdata; +} +#else +static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev) +{ + dev_err(dev, "no platform data defined\n"); + return ERR_PTR(-ENXIO); +} +#endif + +static int 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; + int irq; + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!regs) { + dev_dbg(&pdev->dev, "no memory resource\n"); + return -ENXIO; + } + + pdata = dev_get_platdata(&pdev->dev); + if (!pdata) { + pdata = atmel_ac97c_probe_dt(&pdev->dev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_dbg(&pdev->dev, "could not get irq\n"); + 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); + } + clk_prepare_enable(pclk); + + retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1, + SNDRV_DEFAULT_STR1, THIS_MODULE, + sizeof(struct atmel_ac97c), &card); + if (retval) { + dev_dbg(&pdev->dev, "could not create sound card device\n"); + goto err_snd_card_new; + } + + chip = get_chip(card); + + retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip); + if (retval) { + dev_dbg(&pdev->dev, "unable to request irq %d\n", irq); + goto err_request_irq; + } + chip->irq = irq; + + spin_lock_init(&chip->lock); + + strcpy(card->driver, "Atmel AC97C"); + strcpy(card->shortname, "Atmel AC97C"); + sprintf(card->longname, "Atmel AC97 controller"); + + chip->card = card; + chip->pclk = pclk; + chip->pdev = pdev; + chip->regs = ioremap(regs->start, resource_size(regs)); + + if (!chip->regs) { + dev_dbg(&pdev->dev, "could not remap register memory\n"); + retval = -ENOMEM; + goto err_ioremap; + } + + 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; + } + } else { + chip->reset_pin = -EINVAL; + } + + atmel_ac97c_reset(chip); + + /* Enable overrun interrupt from codec channel */ + ac97c_writel(chip, COMR, AC97C_CSR_OVRUN); + ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT); + + retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus); + if (retval) { + dev_dbg(&pdev->dev, "could not register on ac97 bus\n"); + goto err_ac97_bus; + } + + retval = atmel_ac97c_mixer_new(chip); + if (retval) { + dev_dbg(&pdev->dev, "could not register ac97 mixer\n"); + goto err_ac97_bus; + } + + if (cpu_is_at32ap7000()) { + if (pdata->rx_dws.dma_dev) { + dma_cap_mask_t mask; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + chip->dma.rx_chan = dma_request_channel(mask, filter, + &pdata->rx_dws); + if (chip->dma.rx_chan) { + struct dma_slave_config dma_conf = { + .src_addr = regs->start + AC97C_CARHR + + 2, + .src_addr_width = + DMA_SLAVE_BUSWIDTH_2_BYTES, + .src_maxburst = 1, + .dst_maxburst = 1, + .direction = DMA_DEV_TO_MEM, + .device_fc = false, + }; + + dmaengine_slave_config(chip->dma.rx_chan, + &dma_conf); + } + + dev_info(&chip->pdev->dev, "using %s for DMA RX\n", + dev_name(&chip->dma.rx_chan->dev->device)); + set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); + } + + if (pdata->tx_dws.dma_dev) { + dma_cap_mask_t mask; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + chip->dma.tx_chan = dma_request_channel(mask, filter, + &pdata->tx_dws); + if (chip->dma.tx_chan) { + struct dma_slave_config dma_conf = { + .dst_addr = regs->start + AC97C_CATHR + + 2, + .dst_addr_width = + DMA_SLAVE_BUSWIDTH_2_BYTES, + .src_maxburst = 1, + .dst_maxburst = 1, + .direction = DMA_MEM_TO_DEV, + .device_fc = false, + }; + + dmaengine_slave_config(chip->dma.tx_chan, + &dma_conf); + } + + dev_info(&chip->pdev->dev, "using %s for DMA TX\n", + dev_name(&chip->dma.tx_chan->dev->device)); + 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; + } + } 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) { + 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_dma; + } + + platform_set_drvdata(pdev, card); + + 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)) + 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: + if (gpio_is_valid(chip->reset_pin)) + gpio_free(chip->reset_pin); + + iounmap(chip->regs); +err_ioremap: + free_irq(irq, chip); +err_request_irq: + snd_card_free(card); +err_snd_card_new: + clk_disable_unprepare(pclk); + clk_put(pclk); + return retval; +} + +#ifdef CONFIG_PM_SLEEP +static int atmel_ac97c_suspend(struct device *pdev) +{ + struct snd_card *card = dev_get_drvdata(pdev); + struct atmel_ac97c *chip = card->private_data; + + 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_unprepare(chip->pclk); + + return 0; +} + +static int atmel_ac97c_resume(struct device *pdev) +{ + struct snd_card *card = dev_get_drvdata(pdev); + struct atmel_ac97c *chip = card->private_data; + + clk_prepare_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; +} + +static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume); +#define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm +#else +#define ATMEL_AC97C_PM_OPS NULL +#endif + +static int atmel_ac97c_remove(struct platform_device *pdev) +{ + struct snd_card *card = platform_get_drvdata(pdev); + struct atmel_ac97c *chip = get_chip(card); + + if (gpio_is_valid(chip->reset_pin)) + gpio_free(chip->reset_pin); + + ac97c_writel(chip, CAMR, 0); + ac97c_writel(chip, COMR, 0); + ac97c_writel(chip, MR, 0); + + clk_disable_unprepare(chip->pclk); + clk_put(chip->pclk); + iounmap(chip->regs); + free_irq(chip->irq, chip); + + 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)) + 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_free(card); + + return 0; +} + +static struct platform_driver atmel_ac97c_driver = { + .probe = atmel_ac97c_probe, + .remove = atmel_ac97c_remove, + .driver = { + .name = "atmel_ac97c", + .pm = ATMEL_AC97C_PM_OPS, + .of_match_table = of_match_ptr(atmel_ac97c_dt_ids), + }, +}; +module_platform_driver(atmel_ac97c_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Driver for Atmel AC97 controller"); +MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); |