--- /dev/null
+/*
+ * 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>");
Code Review / kvmfornfv.git / blobdiff