diff options
Diffstat (limited to 'sound/soc/s6000/s6000-i2s.c')
| -rw-r--r-- | sound/soc/s6000/s6000-i2s.c | 629 |
1 files changed, 629 insertions, 0 deletions
diff --git a/sound/soc/s6000/s6000-i2s.c b/sound/soc/s6000/s6000-i2s.c new file mode 100644 index 000000000000..dcc79040bdac --- /dev/null +++ b/sound/soc/s6000/s6000-i2s.c @@ -0,0 +1,629 @@ +/* + * 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"); |