--- /dev/null
+/*
+ * ALSA SoC I2S Audio Layer for the Stretch S6000 family
+ *
+ * Author: Daniel Gloeckner, <dg@emlix.com>
+ * Copyright: (C) 2009 emlix GmbH <info@emlix.com>
+ *
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include "s6000-i2s.h"
+#include "s6000-pcm.h"
+
+struct s6000_i2s_dev {
+ dma_addr_t sifbase;
+ u8 __iomem *scbbase;
+ unsigned int wide;
+ unsigned int channel_in;
+ unsigned int channel_out;
+ unsigned int lines_in;
+ unsigned int lines_out;
+ struct s6000_pcm_dma_params dma_params;
+};
+
+#define S6_I2S_INTERRUPT_STATUS 0x00
+#define S6_I2S_INT_OVERRUN 1
+#define S6_I2S_INT_UNDERRUN 2
+#define S6_I2S_INT_ALIGNMENT 4
+#define S6_I2S_INTERRUPT_ENABLE 0x04
+#define S6_I2S_INTERRUPT_RAW 0x08
+#define S6_I2S_INTERRUPT_CLEAR 0x0C
+#define S6_I2S_INTERRUPT_SET 0x10
+#define S6_I2S_MODE 0x20
+#define S6_I2S_DUAL 0
+#define S6_I2S_WIDE 1
+#define S6_I2S_TX_DEFAULT 0x24
+#define S6_I2S_DATA_CFG(c) (0x40 + 0x10 * (c))
+#define S6_I2S_IN 0
+#define S6_I2S_OUT 1
+#define S6_I2S_UNUSED 2
+#define S6_I2S_INTERFACE_CFG(c) (0x44 + 0x10 * (c))
+#define S6_I2S_DIV_MASK 0x001fff
+#define S6_I2S_16BIT 0x000000
+#define S6_I2S_20BIT 0x002000
+#define S6_I2S_24BIT 0x004000
+#define S6_I2S_32BIT 0x006000
+#define S6_I2S_BITS_MASK 0x006000
+#define S6_I2S_MEM_16BIT 0x000000
+#define S6_I2S_MEM_32BIT 0x008000
+#define S6_I2S_MEM_MASK 0x008000
+#define S6_I2S_CHANNELS_SHIFT 16
+#define S6_I2S_CHANNELS_MASK 0x030000
+#define S6_I2S_SCK_IN 0x000000
+#define S6_I2S_SCK_OUT 0x040000
+#define S6_I2S_SCK_DIR 0x040000
+#define S6_I2S_WS_IN 0x000000
+#define S6_I2S_WS_OUT 0x080000
+#define S6_I2S_WS_DIR 0x080000
+#define S6_I2S_LEFT_FIRST 0x000000
+#define S6_I2S_RIGHT_FIRST 0x100000
+#define S6_I2S_FIRST 0x100000
+#define S6_I2S_CUR_SCK 0x200000
+#define S6_I2S_CUR_WS 0x400000
+#define S6_I2S_ENABLE(c) (0x48 + 0x10 * (c))
+#define S6_I2S_DISABLE_IF 0x02
+#define S6_I2S_ENABLE_IF 0x03
+#define S6_I2S_IS_BUSY 0x04
+#define S6_I2S_DMA_ACTIVE 0x08
+#define S6_I2S_IS_ENABLED 0x10
+
+#define S6_I2S_NUM_LINES 4
+
+#define S6_I2S_SIF_PORT0 0x0000000
+#define S6_I2S_SIF_PORT1 0x0000080 /* docs say 0x0000010 */
+
+static inline void s6_i2s_write_reg(struct s6000_i2s_dev *dev, int reg, u32 val)
+{
+ writel(val, dev->scbbase + reg);
+}
+
+static inline u32 s6_i2s_read_reg(struct s6000_i2s_dev *dev, int reg)
+{
+ return readl(dev->scbbase + reg);
+}
+
+static inline void s6_i2s_mod_reg(struct s6000_i2s_dev *dev, int reg,
+ u32 mask, u32 val)
+{
+ val ^= s6_i2s_read_reg(dev, reg) & ~mask;
+ s6_i2s_write_reg(dev, reg, val);
+}
+
+static void s6000_i2s_start_channel(struct s6000_i2s_dev *dev, int channel)
+{
+ int i, j, cur, prev;
+
+ /*
+ * Wait for WCLK to toggle 5 times before enabling the channel
+ * s6000 Family Datasheet 3.6.4:
+ * "At least two cycles of WS must occur between commands
+ * to disable or enable the interface"
+ */
+ j = 0;
+ prev = ~S6_I2S_CUR_WS;
+ for (i = 1000000; --i && j < 6; ) {
+ cur = s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(channel))
+ & S6_I2S_CUR_WS;
+ if (prev != cur) {
+ prev = cur;
+ j++;
+ }
+ }
+ if (j < 6)
+ printk(KERN_WARNING "s6000-i2s: timeout waiting for WCLK\n");
+
+ s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_ENABLE_IF);
+}
+
+static void s6000_i2s_stop_channel(struct s6000_i2s_dev *dev, int channel)
+{
+ s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_DISABLE_IF);
+}
+
+static void s6000_i2s_start(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct s6000_i2s_dev *dev = rtd->dai->cpu_dai->private_data;
+ int channel;
+
+ channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
+ dev->channel_out : dev->channel_in;
+
+ s6000_i2s_start_channel(dev, channel);
+}
+
+static void s6000_i2s_stop(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct s6000_i2s_dev *dev = rtd->dai->cpu_dai->private_data;
+ int channel;
+
+ channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
+ dev->channel_out : dev->channel_in;
+
+ s6000_i2s_stop_channel(dev, channel);
+}
+
+static int s6000_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+ int after)
+{
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ if ((substream->stream == SNDRV_PCM_STREAM_CAPTURE) ^ !after)
+ s6000_i2s_start(substream);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ if (!after)
+ s6000_i2s_stop(substream);
+ }
+ return 0;
+}
+
+static unsigned int s6000_i2s_int_sources(struct s6000_i2s_dev *dev)
+{
+ unsigned int pending;
+ pending = s6_i2s_read_reg(dev, S6_I2S_INTERRUPT_RAW);
+ pending &= S6_I2S_INT_ALIGNMENT |
+ S6_I2S_INT_UNDERRUN |
+ S6_I2S_INT_OVERRUN;
+ s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR, pending);
+
+ return pending;
+}
+
+static unsigned int s6000_i2s_check_xrun(struct snd_soc_dai *cpu_dai)
+{
+ struct s6000_i2s_dev *dev = cpu_dai->private_data;
+ unsigned int errors;
+ unsigned int ret;
+
+ errors = s6000_i2s_int_sources(dev);
+ if (likely(!errors))
+ return 0;
+
+ ret = 0;
+ if (errors & S6_I2S_INT_ALIGNMENT)
+ printk(KERN_ERR "s6000-i2s: WCLK misaligned\n");
+ if (errors & S6_I2S_INT_UNDERRUN)
+ ret |= 1 << SNDRV_PCM_STREAM_PLAYBACK;
+ if (errors & S6_I2S_INT_OVERRUN)
+ ret |= 1 << SNDRV_PCM_STREAM_CAPTURE;
+ return ret;
+}
+
+static void s6000_i2s_wait_disabled(struct s6000_i2s_dev *dev)
+{
+ int channel;
+ int n = 50;
+ for (channel = 0; channel < 2; channel++) {
+ while (--n >= 0) {
+ int v = s6_i2s_read_reg(dev, S6_I2S_ENABLE(channel));
+ if ((v & S6_I2S_IS_ENABLED)
+ || !(v & (S6_I2S_DMA_ACTIVE | S6_I2S_IS_BUSY)))
+ break;
+ udelay(20);
+ }
+ }
+ if (n < 0)
+ printk(KERN_WARNING "s6000-i2s: timeout disabling interfaces");
+}
+
+static int s6000_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
+ unsigned int fmt)
+{
+ struct s6000_i2s_dev *dev = cpu_dai->private_data;
+ u32 w;
+
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBM_CFM:
+ w = S6_I2S_SCK_IN | S6_I2S_WS_IN;
+ break;
+ case SND_SOC_DAIFMT_CBS_CFM:
+ w = S6_I2S_SCK_OUT | S6_I2S_WS_IN;
+ break;
+ case SND_SOC_DAIFMT_CBM_CFS:
+ w = S6_I2S_SCK_IN | S6_I2S_WS_OUT;
+ break;
+ case SND_SOC_DAIFMT_CBS_CFS:
+ w = S6_I2S_SCK_OUT | S6_I2S_WS_OUT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_IB_IF:
+ w |= S6_I2S_LEFT_FIRST;
+ break;
+ case SND_SOC_DAIFMT_IB_NF:
+ w |= S6_I2S_RIGHT_FIRST;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(0),
+ S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
+ s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(1),
+ S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
+
+ return 0;
+}
+
+static int s6000_i2s_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div)
+{
+ struct s6000_i2s_dev *dev = dai->private_data;
+
+ if (!div || (div & 1) || div > (S6_I2S_DIV_MASK + 1) * 2)
+ return -EINVAL;
+
+ s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(div_id),
+ S6_I2S_DIV_MASK, div / 2 - 1);
+ return 0;
+}
+
+static int s6000_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct s6000_i2s_dev *dev = dai->private_data;
+ int interf;
+ u32 w = 0;
+
+ if (dev->wide)
+ interf = 0;
+ else {
+ w |= (((params_channels(params) - 2) / 2)
+ << S6_I2S_CHANNELS_SHIFT) & S6_I2S_CHANNELS_MASK;
+ interf = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ ? dev->channel_out : dev->channel_in;
+ }
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ w |= S6_I2S_16BIT | S6_I2S_MEM_16BIT;
+ break;
+ case SNDRV_PCM_FORMAT_S32_LE:
+ w |= S6_I2S_32BIT | S6_I2S_MEM_32BIT;
+ break;
+ default:
+ printk(KERN_WARNING "s6000-i2s: unsupported PCM format %x\n",
+ params_format(params));
+ return -EINVAL;
+ }
+
+ if (s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(interf))
+ & S6_I2S_IS_ENABLED) {
+ printk(KERN_ERR "s6000-i2s: interface already enabled\n");
+ return -EBUSY;
+ }
+
+ s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(interf),
+ S6_I2S_CHANNELS_MASK|S6_I2S_MEM_MASK|S6_I2S_BITS_MASK,
+ w);
+
+ return 0;
+}
+
+static int s6000_i2s_dai_probe(struct platform_device *pdev,
+ struct snd_soc_dai *dai)
+{
+ struct s6000_i2s_dev *dev = dai->private_data;
+ struct s6000_snd_platform_data *pdata = pdev->dev.platform_data;
+
+ if (!pdata)
+ return -EINVAL;
+
+ dev->wide = pdata->wide;
+ dev->channel_in = pdata->channel_in;
+ dev->channel_out = pdata->channel_out;
+ dev->lines_in = pdata->lines_in;
+ dev->lines_out = pdata->lines_out;
+
+ s6_i2s_write_reg(dev, S6_I2S_MODE,
+ dev->wide ? S6_I2S_WIDE : S6_I2S_DUAL);
+
+ if (dev->wide) {
+ int i;
+
+ if (dev->lines_in + dev->lines_out > S6_I2S_NUM_LINES)
+ return -EINVAL;
+
+ dev->channel_in = 0;
+ dev->channel_out = 1;
+ dai->capture.channels_min = 2 * dev->lines_in;
+ dai->capture.channels_max = dai->capture.channels_min;
+ dai->playback.channels_min = 2 * dev->lines_out;
+ dai->playback.channels_max = dai->playback.channels_min;
+
+ for (i = 0; i < dev->lines_out; i++)
+ s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_OUT);
+
+ for (; i < S6_I2S_NUM_LINES - dev->lines_in; i++)
+ s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i),
+ S6_I2S_UNUSED);
+
+ for (; i < S6_I2S_NUM_LINES; i++)
+ s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_IN);
+ } else {
+ unsigned int cfg[2] = {S6_I2S_UNUSED, S6_I2S_UNUSED};
+
+ if (dev->lines_in > 1 || dev->lines_out > 1)
+ return -EINVAL;
+
+ dai->capture.channels_min = 2 * dev->lines_in;
+ dai->capture.channels_max = 8 * dev->lines_in;
+ dai->playback.channels_min = 2 * dev->lines_out;
+ dai->playback.channels_max = 8 * dev->lines_out;
+
+ if (dev->lines_in)
+ cfg[dev->channel_in] = S6_I2S_IN;
+ if (dev->lines_out)
+ cfg[dev->channel_out] = S6_I2S_OUT;
+
+ s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(0), cfg[0]);
+ s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(1), cfg[1]);
+ }
+
+ if (dev->lines_out) {
+ if (dev->lines_in) {
+ if (!dev->dma_params.dma_out)
+ return -ENODEV;
+ } else {
+ dev->dma_params.dma_out = dev->dma_params.dma_in;
+ dev->dma_params.dma_in = 0;
+ }
+ }
+ dev->dma_params.sif_in = dev->sifbase + (dev->channel_in ?
+ S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
+ dev->dma_params.sif_out = dev->sifbase + (dev->channel_out ?
+ S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
+ dev->dma_params.same_rate = pdata->same_rate | pdata->wide;
+ return 0;
+}
+
+#define S6000_I2S_RATES (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
+ SNDRV_PCM_RATE_8000_192000)
+#define S6000_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
+
+static struct snd_soc_dai_ops s6000_i2s_dai_ops = {
+ .set_fmt = s6000_i2s_set_dai_fmt,
+ .set_clkdiv = s6000_i2s_set_clkdiv,
+ .hw_params = s6000_i2s_hw_params,
+};
+
+struct snd_soc_dai s6000_i2s_dai = {
+ .name = "s6000-i2s",
+ .id = 0,
+ .probe = s6000_i2s_dai_probe,
+ .playback = {
+ .channels_min = 2,
+ .channels_max = 8,
+ .formats = S6000_I2S_FORMATS,
+ .rates = S6000_I2S_RATES,
+ .rate_min = 0,
+ .rate_max = 1562500,
+ },
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 8,
+ .formats = S6000_I2S_FORMATS,
+ .rates = S6000_I2S_RATES,
+ .rate_min = 0,
+ .rate_max = 1562500,
+ },
+ .ops = &s6000_i2s_dai_ops,
+}
+EXPORT_SYMBOL_GPL(s6000_i2s_dai);
+
+static int __devinit s6000_i2s_probe(struct platform_device *pdev)
+{
+ struct s6000_i2s_dev *dev;
+ struct resource *scbmem, *sifmem, *region, *dma1, *dma2;
+ u8 __iomem *mmio;
+ int ret;
+
+ scbmem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!scbmem) {
+ dev_err(&pdev->dev, "no mem resource?\n");
+ ret = -ENODEV;
+ goto err_release_none;
+ }
+
+ region = request_mem_region(scbmem->start,
+ scbmem->end - scbmem->start + 1,
+ pdev->name);
+ if (!region) {
+ dev_err(&pdev->dev, "I2S SCB region already claimed\n");
+ ret = -EBUSY;
+ goto err_release_none;
+ }
+
+ mmio = ioremap(scbmem->start, scbmem->end - scbmem->start + 1);
+ if (!mmio) {
+ dev_err(&pdev->dev, "can't ioremap SCB region\n");
+ ret = -ENOMEM;
+ goto err_release_scb;
+ }
+
+ sifmem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!sifmem) {
+ dev_err(&pdev->dev, "no second mem resource?\n");
+ ret = -ENODEV;
+ goto err_release_map;
+ }
+
+ region = request_mem_region(sifmem->start,
+ sifmem->end - sifmem->start + 1,
+ pdev->name);
+ if (!region) {
+ dev_err(&pdev->dev, "I2S SIF region already claimed\n");
+ ret = -EBUSY;
+ goto err_release_map;
+ }
+
+ dma1 = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!dma1) {
+ dev_err(&pdev->dev, "no dma resource?\n");
+ ret = -ENODEV;
+ goto err_release_sif;
+ }
+
+ region = request_mem_region(dma1->start, dma1->end - dma1->start + 1,
+ pdev->name);
+ if (!region) {
+ dev_err(&pdev->dev, "I2S DMA region already claimed\n");
+ ret = -EBUSY;
+ goto err_release_sif;
+ }
+
+ dma2 = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+ if (dma2) {
+ region = request_mem_region(dma2->start,
+ dma2->end - dma2->start + 1,
+ pdev->name);
+ if (!region) {
+ dev_err(&pdev->dev,
+ "I2S DMA region already claimed\n");
+ ret = -EBUSY;
+ goto err_release_dma1;
+ }
+ }
+
+ dev = kzalloc(sizeof(struct s6000_i2s_dev), GFP_KERNEL);
+ if (!dev) {
+ ret = -ENOMEM;
+ goto err_release_dma2;
+ }
+
+ s6000_i2s_dai.dev = &pdev->dev;
+ s6000_i2s_dai.private_data = dev;
+ s6000_i2s_dai.dma_data = &dev->dma_params;
+
+ dev->sifbase = sifmem->start;
+ dev->scbbase = mmio;
+
+ s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
+ s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR,
+ S6_I2S_INT_ALIGNMENT |
+ S6_I2S_INT_UNDERRUN |
+ S6_I2S_INT_OVERRUN);
+
+ s6000_i2s_stop_channel(dev, 0);
+ s6000_i2s_stop_channel(dev, 1);
+ s6000_i2s_wait_disabled(dev);
+
+ dev->dma_params.check_xrun = s6000_i2s_check_xrun;
+ dev->dma_params.trigger = s6000_i2s_trigger;
+ dev->dma_params.dma_in = dma1->start;
+ dev->dma_params.dma_out = dma2 ? dma2->start : 0;
+ dev->dma_params.irq = platform_get_irq(pdev, 0);
+ if (dev->dma_params.irq < 0) {
+ dev_err(&pdev->dev, "no irq resource?\n");
+ ret = -ENODEV;
+ goto err_release_dev;
+ }
+
+ s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE,
+ S6_I2S_INT_ALIGNMENT |
+ S6_I2S_INT_UNDERRUN |
+ S6_I2S_INT_OVERRUN);
+
+ ret = snd_soc_register_dai(&s6000_i2s_dai);
+ if (ret)
+ goto err_release_dev;
+
+ return 0;
+
+err_release_dev:
+ kfree(dev);
+err_release_dma2:
+ if (dma2)
+ release_mem_region(dma2->start, dma2->end - dma2->start + 1);
+err_release_dma1:
+ release_mem_region(dma1->start, dma1->end - dma1->start + 1);
+err_release_sif:
+ release_mem_region(sifmem->start, (sifmem->end - sifmem->start) + 1);
+err_release_map:
+ iounmap(mmio);
+err_release_scb:
+ release_mem_region(scbmem->start, (scbmem->end - scbmem->start) + 1);
+err_release_none:
+ return ret;
+}
+
+static void __devexit s6000_i2s_remove(struct platform_device *pdev)
+{
+ struct s6000_i2s_dev *dev = s6000_i2s_dai.private_data;
+ struct resource *region;
+ void __iomem *mmio = dev->scbbase;
+
+ snd_soc_unregister_dai(&s6000_i2s_dai);
+
+ s6000_i2s_stop_channel(dev, 0);
+ s6000_i2s_stop_channel(dev, 1);
+
+ s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
+ s6000_i2s_dai.private_data = 0;
+ kfree(dev);
+
+ region = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ release_mem_region(region->start, region->end - region->start + 1);
+
+ region = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+ if (region)
+ release_mem_region(region->start,
+ region->end - region->start + 1);
+
+ region = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(region->start, (region->end - region->start) + 1);
+
+ iounmap(mmio);
+ region = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ release_mem_region(region->start, (region->end - region->start) + 1);
+}
+
+static struct platform_driver s6000_i2s_driver = {
+ .probe = s6000_i2s_probe,
+ .remove = __devexit_p(s6000_i2s_remove),
+ .driver = {
+ .name = "s6000-i2s",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init s6000_i2s_init(void)
+{
+ return platform_driver_register(&s6000_i2s_driver);
+}
+module_init(s6000_i2s_init);
+
+static void __exit s6000_i2s_exit(void)
+{
+ platform_driver_unregister(&s6000_i2s_driver);
+}
+module_exit(s6000_i2s_exit);
+
+MODULE_AUTHOR("Daniel Gloeckner");
+MODULE_DESCRIPTION("Stretch s6000 family I2S SoC Interface");
+MODULE_LICENSE("GPL");
--- /dev/null
+/*
+ * ALSA PCM interface for the Stetch s6000 family
+ *
+ * Author: Daniel Gloeckner, <dg@emlix.com>
+ * Copyright: (C) 2009 emlix GmbH <info@emlix.com>
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <asm/dma.h>
+#include <variant/dmac.h>
+
+#include "s6000-pcm.h"
+
+#define S6_PCM_PREALLOCATE_SIZE (96 * 1024)
+#define S6_PCM_PREALLOCATE_MAX (2048 * 1024)
+
+static struct snd_pcm_hardware s6000_pcm_hardware = {
+ .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_JOINT_DUPLEX),
+ .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE),
+ .rates = (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
+ SNDRV_PCM_RATE_8000_192000),
+ .rate_min = 0,
+ .rate_max = 1562500,
+ .channels_min = 2,
+ .channels_max = 8,
+ .buffer_bytes_max = 0x7ffffff0,
+ .period_bytes_min = 16,
+ .period_bytes_max = 0xfffff0,
+ .periods_min = 2,
+ .periods_max = 1024, /* no limit */
+ .fifo_size = 0,
+};
+
+struct s6000_runtime_data {
+ spinlock_t lock;
+ int period; /* current DMA period */
+};
+
+static void s6000_pcm_enqueue_dma(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct s6000_runtime_data *prtd = runtime->private_data;
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+ int channel;
+ unsigned int period_size;
+ unsigned int dma_offset;
+ dma_addr_t dma_pos;
+ dma_addr_t src, dst;
+
+ period_size = snd_pcm_lib_period_bytes(substream);
+ dma_offset = prtd->period * period_size;
+ dma_pos = runtime->dma_addr + dma_offset;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ src = dma_pos;
+ dst = par->sif_out;
+ channel = par->dma_out;
+ } else {
+ src = par->sif_in;
+ dst = dma_pos;
+ channel = par->dma_in;
+ }
+
+ if (!s6dmac_channel_enabled(DMA_MASK_DMAC(channel),
+ DMA_INDEX_CHNL(channel)))
+ return;
+
+ if (s6dmac_fifo_full(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel))) {
+ printk(KERN_ERR "s6000-pcm: fifo full\n");
+ return;
+ }
+
+ BUG_ON(period_size & 15);
+ s6dmac_put_fifo(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel),
+ src, dst, period_size);
+
+ prtd->period++;
+ if (unlikely(prtd->period >= runtime->periods))
+ prtd->period = 0;
+}
+
+static irqreturn_t s6000_pcm_irq(int irq, void *data)
+{
+ struct snd_pcm *pcm = data;
+ struct snd_soc_pcm_runtime *runtime = pcm->private_data;
+ struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
+ struct s6000_runtime_data *prtd;
+ unsigned int has_xrun;
+ int i, ret = IRQ_NONE;
+ u32 channel[2] = {
+ [SNDRV_PCM_STREAM_PLAYBACK] = params->dma_out,
+ [SNDRV_PCM_STREAM_CAPTURE] = params->dma_in
+ };
+
+ has_xrun = params->check_xrun(runtime->dai->cpu_dai);
+
+ for (i = 0; i < ARRAY_SIZE(channel); ++i) {
+ struct snd_pcm_substream *substream = pcm->streams[i].substream;
+ unsigned int pending;
+
+ if (!channel[i])
+ continue;
+
+ if (unlikely(has_xrun & (1 << i)) &&
+ substream->runtime &&
+ snd_pcm_running(substream)) {
+ dev_dbg(pcm->dev, "xrun\n");
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+ ret = IRQ_HANDLED;
+ }
+
+ pending = s6dmac_int_sources(DMA_MASK_DMAC(channel[i]),
+ DMA_INDEX_CHNL(channel[i]));
+
+ if (pending & 1) {
+ ret = IRQ_HANDLED;
+ if (likely(substream->runtime &&
+ snd_pcm_running(substream))) {
+ snd_pcm_period_elapsed(substream);
+ dev_dbg(pcm->dev, "period elapsed %x %x\n",
+ s6dmac_cur_src(DMA_MASK_DMAC(channel[i]),
+ DMA_INDEX_CHNL(channel[i])),
+ s6dmac_cur_dst(DMA_MASK_DMAC(channel[i]),
+ DMA_INDEX_CHNL(channel[i])));
+ prtd = substream->runtime->private_data;
+ spin_lock(&prtd->lock);
+ s6000_pcm_enqueue_dma(substream);
+ spin_unlock(&prtd->lock);
+ }
+ }
+
+ if (unlikely(pending & ~7)) {
+ if (pending & (1 << 3))
+ printk(KERN_WARNING
+ "s6000-pcm: DMA %x Underflow\n",
+ channel[i]);
+ if (pending & (1 << 4))
+ printk(KERN_WARNING
+ "s6000-pcm: DMA %x Overflow\n",
+ channel[i]);
+ if (pending & 0x1e0)
+ printk(KERN_WARNING
+ "s6000-pcm: DMA %x Master Error "
+ "(mask %x)\n",
+ channel[i], pending >> 5);
+
+ }
+ }
+
+ return ret;
+}
+
+static int s6000_pcm_start(struct snd_pcm_substream *substream)
+{
+ struct s6000_runtime_data *prtd = substream->runtime->private_data;
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+ unsigned long flags;
+ int srcinc;
+ u32 dma;
+
+ spin_lock_irqsave(&prtd->lock, flags);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ srcinc = 1;
+ dma = par->dma_out;
+ } else {
+ srcinc = 0;
+ dma = par->dma_in;
+ }
+ s6dmac_enable_chan(DMA_MASK_DMAC(dma), DMA_INDEX_CHNL(dma),
+ 1 /* priority 1 (0 is max) */,
+ 0 /* peripheral requests w/o xfer length mode */,
+ srcinc /* source address increment */,
+ srcinc^1 /* destination address increment */,
+ 0 /* chunksize 0 (skip impossible on this dma) */,
+ 0 /* source skip after chunk (impossible) */,
+ 0 /* destination skip after chunk (impossible) */,
+ 4 /* 16 byte burst size */,
+ -1 /* don't conserve bandwidth */,
+ 0 /* low watermark irq descriptor theshold */,
+ 0 /* disable hardware timestamps */,
+ 1 /* enable channel */);
+
+ s6000_pcm_enqueue_dma(substream);
+ s6000_pcm_enqueue_dma(substream);
+
+ spin_unlock_irqrestore(&prtd->lock, flags);
+
+ return 0;
+}
+
+static int s6000_pcm_stop(struct snd_pcm_substream *substream)
+{
+ struct s6000_runtime_data *prtd = substream->runtime->private_data;
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+ unsigned long flags;
+ u32 channel;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ channel = par->dma_out;
+ else
+ channel = par->dma_in;
+
+ s6dmac_set_terminal_count(DMA_MASK_DMAC(channel),
+ DMA_INDEX_CHNL(channel), 0);
+
+ spin_lock_irqsave(&prtd->lock, flags);
+
+ s6dmac_disable_chan(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel));
+
+ spin_unlock_irqrestore(&prtd->lock, flags);
+
+ return 0;
+}
+
+static int s6000_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+ int ret;
+
+ ret = par->trigger(substream, cmd, 0);
+ if (ret < 0)
+ return ret;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ ret = s6000_pcm_start(substream);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ ret = s6000_pcm_stop(substream);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ if (ret < 0)
+ return ret;
+
+ return par->trigger(substream, cmd, 1);
+}
+
+static int s6000_pcm_prepare(struct snd_pcm_substream *substream)
+{
+ struct s6000_runtime_data *prtd = substream->runtime->private_data;
+
+ prtd->period = 0;
+
+ return 0;
+}
+
+static snd_pcm_uframes_t s6000_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct s6000_runtime_data *prtd = runtime->private_data;
+ unsigned long flags;
+ unsigned int offset;
+ dma_addr_t count;
+
+ spin_lock_irqsave(&prtd->lock, flags);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ count = s6dmac_cur_src(DMA_MASK_DMAC(par->dma_out),
+ DMA_INDEX_CHNL(par->dma_out));
+ else
+ count = s6dmac_cur_dst(DMA_MASK_DMAC(par->dma_in),
+ DMA_INDEX_CHNL(par->dma_in));
+
+ count -= runtime->dma_addr;
+
+ spin_unlock_irqrestore(&prtd->lock, flags);
+
+ offset = bytes_to_frames(runtime, count);
+ if (unlikely(offset >= runtime->buffer_size))
+ offset = 0;
+
+ return offset;
+}
+
+static int s6000_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct s6000_runtime_data *prtd;
+ int ret;
+
+ snd_soc_set_runtime_hwparams(substream, &s6000_pcm_hardware);
+
+ ret = snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16);
+ if (ret < 0)
+ return ret;
+ ret = snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 16);
+ if (ret < 0)
+ return ret;
+ ret = snd_pcm_hw_constraint_integer(runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ if (ret < 0)
+ return ret;
+
+ if (par->same_rate) {
+ int rate;
+ spin_lock(&par->lock); /* needed? */
+ rate = par->rate;
+ spin_unlock(&par->lock);
+ if (rate != -1) {
+ ret = snd_pcm_hw_constraint_minmax(runtime,
+ SNDRV_PCM_HW_PARAM_RATE,
+ rate, rate);
+ if (ret < 0)
+ return ret;
+ }
+ }
+
+ prtd = kzalloc(sizeof(struct s6000_runtime_data), GFP_KERNEL);
+ if (prtd == NULL)
+ return -ENOMEM;
+
+ spin_lock_init(&prtd->lock);
+
+ runtime->private_data = prtd;
+
+ return 0;
+}
+
+static int s6000_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct s6000_runtime_data *prtd = runtime->private_data;
+
+ kfree(prtd);
+
+ return 0;
+}
+
+static int s6000_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+ int ret;
+ ret = snd_pcm_lib_malloc_pages(substream,
+ params_buffer_bytes(hw_params));
+ if (ret < 0) {
+ printk(KERN_WARNING "s6000-pcm: allocation of memory failed\n");
+ return ret;
+ }
+
+ if (par->same_rate) {
+ spin_lock(&par->lock);
+ if (par->rate == -1 ||
+ !(par->in_use & ~(1 << substream->stream))) {
+ par->rate = params_rate(hw_params);
+ par->in_use |= 1 << substream->stream;
+ } else if (params_rate(hw_params) != par->rate) {
+ snd_pcm_lib_free_pages(substream);
+ par->in_use &= ~(1 << substream->stream);
+ ret = -EBUSY;
+ }
+ spin_unlock(&par->lock);
+ }
+ return ret;
+}
+
+static int s6000_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+
+ spin_lock(&par->lock);
+ par->in_use &= ~(1 << substream->stream);
+ if (!par->in_use)
+ par->rate = -1;
+ spin_unlock(&par->lock);
+
+ return snd_pcm_lib_free_pages(substream);
+}
+
+static struct snd_pcm_ops s6000_pcm_ops = {
+ .open = s6000_pcm_open,
+ .close = s6000_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = s6000_pcm_hw_params,
+ .hw_free = s6000_pcm_hw_free,
+ .trigger = s6000_pcm_trigger,
+ .prepare = s6000_pcm_prepare,
+ .pointer = s6000_pcm_pointer,
+};
+
+static void s6000_pcm_free(struct snd_pcm *pcm)
+{
+ struct snd_soc_pcm_runtime *runtime = pcm->private_data;
+ struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
+
+ free_irq(params->irq, pcm);
+ snd_pcm_lib_preallocate_free_for_all(pcm);
+}
+
+static u64 s6000_pcm_dmamask = DMA_32BIT_MASK;
+
+static int s6000_pcm_new(struct snd_card *card,
+ struct snd_soc_dai *dai, struct snd_pcm *pcm)
+{
+ struct snd_soc_pcm_runtime *runtime = pcm->private_data;
+ struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
+ int res;
+
+ if (!card->dev->dma_mask)
+ card->dev->dma_mask = &s6000_pcm_dmamask;
+ if (!card->dev->coherent_dma_mask)
+ card->dev->coherent_dma_mask = DMA_32BIT_MASK;
+
+ if (params->dma_in) {
+ s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_in),
+ DMA_INDEX_CHNL(params->dma_in));
+ s6dmac_int_sources(DMA_MASK_DMAC(params->dma_in),
+ DMA_INDEX_CHNL(params->dma_in));
+ }
+
+ if (params->dma_out) {
+ s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_out),
+ DMA_INDEX_CHNL(params->dma_out));
+ s6dmac_int_sources(DMA_MASK_DMAC(params->dma_out),
+ DMA_INDEX_CHNL(params->dma_out));
+ }
+
+ res = request_irq(params->irq, s6000_pcm_irq, IRQF_SHARED,
+ s6000_soc_platform.name, pcm);
+ if (res) {
+ printk(KERN_ERR "s6000-pcm couldn't get IRQ\n");
+ return res;
+ }
+
+ res = snd_pcm_lib_preallocate_pages_for_all(pcm,
+ SNDRV_DMA_TYPE_DEV,
+ card->dev,
+ S6_PCM_PREALLOCATE_SIZE,
+ S6_PCM_PREALLOCATE_MAX);
+ if (res)
+ printk(KERN_WARNING "s6000-pcm: preallocation failed\n");
+
+ spin_lock_init(¶ms->lock);
+ params->in_use = 0;
+ params->rate = -1;
+ return 0;
+}
+
+struct snd_soc_platform s6000_soc_platform = {
+ .name = "s6000-audio",
+ .pcm_ops = &s6000_pcm_ops,
+ .pcm_new = s6000_pcm_new,
+ .pcm_free = s6000_pcm_free,
+};
+EXPORT_SYMBOL_GPL(s6000_soc_platform);
+
+static int __init s6000_pcm_init(void)
+{
+ return snd_soc_register_platform(&s6000_soc_platform);
+}
+module_init(s6000_pcm_init);
+
+static void __exit s6000_pcm_exit(void)
+{
+ snd_soc_unregister_platform(&s6000_soc_platform);
+}
+module_exit(s6000_pcm_exit);
+
+MODULE_AUTHOR("Daniel Gloeckner");
+MODULE_DESCRIPTION("Stretch s6000 family PCM DMA module");
+MODULE_LICENSE("GPL");
git.openpandora.org / pandora-kernel.git / commitdiff