622 lines
16 KiB
C
622 lines
16 KiB
C
/*
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* ALSA SoC I2S Audio Layer for the Stretch S6000 family
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*
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* Author: Daniel Gloeckner, <dg@emlix.com>
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* Copyright: (C) 2009 emlix GmbH <info@emlix.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/initval.h>
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#include <sound/soc.h>
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#include "s6000-i2s.h"
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#include "s6000-pcm.h"
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struct s6000_i2s_dev {
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dma_addr_t sifbase;
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u8 __iomem *scbbase;
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unsigned int wide;
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unsigned int channel_in;
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unsigned int channel_out;
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unsigned int lines_in;
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unsigned int lines_out;
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struct s6000_pcm_dma_params dma_params;
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};
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#define S6_I2S_INTERRUPT_STATUS 0x00
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#define S6_I2S_INT_OVERRUN 1
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#define S6_I2S_INT_UNDERRUN 2
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#define S6_I2S_INT_ALIGNMENT 4
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#define S6_I2S_INTERRUPT_ENABLE 0x04
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#define S6_I2S_INTERRUPT_RAW 0x08
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#define S6_I2S_INTERRUPT_CLEAR 0x0C
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#define S6_I2S_INTERRUPT_SET 0x10
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#define S6_I2S_MODE 0x20
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#define S6_I2S_DUAL 0
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#define S6_I2S_WIDE 1
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#define S6_I2S_TX_DEFAULT 0x24
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#define S6_I2S_DATA_CFG(c) (0x40 + 0x10 * (c))
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#define S6_I2S_IN 0
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#define S6_I2S_OUT 1
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#define S6_I2S_UNUSED 2
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#define S6_I2S_INTERFACE_CFG(c) (0x44 + 0x10 * (c))
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#define S6_I2S_DIV_MASK 0x001fff
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#define S6_I2S_16BIT 0x000000
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#define S6_I2S_20BIT 0x002000
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#define S6_I2S_24BIT 0x004000
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#define S6_I2S_32BIT 0x006000
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#define S6_I2S_BITS_MASK 0x006000
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#define S6_I2S_MEM_16BIT 0x000000
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#define S6_I2S_MEM_32BIT 0x008000
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#define S6_I2S_MEM_MASK 0x008000
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#define S6_I2S_CHANNELS_SHIFT 16
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#define S6_I2S_CHANNELS_MASK 0x030000
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#define S6_I2S_SCK_IN 0x000000
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#define S6_I2S_SCK_OUT 0x040000
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#define S6_I2S_SCK_DIR 0x040000
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#define S6_I2S_WS_IN 0x000000
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#define S6_I2S_WS_OUT 0x080000
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#define S6_I2S_WS_DIR 0x080000
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#define S6_I2S_LEFT_FIRST 0x000000
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#define S6_I2S_RIGHT_FIRST 0x100000
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#define S6_I2S_FIRST 0x100000
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#define S6_I2S_CUR_SCK 0x200000
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#define S6_I2S_CUR_WS 0x400000
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#define S6_I2S_ENABLE(c) (0x48 + 0x10 * (c))
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#define S6_I2S_DISABLE_IF 0x02
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#define S6_I2S_ENABLE_IF 0x03
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#define S6_I2S_IS_BUSY 0x04
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#define S6_I2S_DMA_ACTIVE 0x08
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#define S6_I2S_IS_ENABLED 0x10
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#define S6_I2S_NUM_LINES 4
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#define S6_I2S_SIF_PORT0 0x0000000
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#define S6_I2S_SIF_PORT1 0x0000080 /* docs say 0x0000010 */
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static inline void s6_i2s_write_reg(struct s6000_i2s_dev *dev, int reg, u32 val)
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{
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writel(val, dev->scbbase + reg);
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}
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static inline u32 s6_i2s_read_reg(struct s6000_i2s_dev *dev, int reg)
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{
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return readl(dev->scbbase + reg);
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}
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static inline void s6_i2s_mod_reg(struct s6000_i2s_dev *dev, int reg,
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u32 mask, u32 val)
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{
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val ^= s6_i2s_read_reg(dev, reg) & ~mask;
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s6_i2s_write_reg(dev, reg, val);
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}
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static void s6000_i2s_start_channel(struct s6000_i2s_dev *dev, int channel)
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{
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int i, j, cur, prev;
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/*
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* Wait for WCLK to toggle 5 times before enabling the channel
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* s6000 Family Datasheet 3.6.4:
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* "At least two cycles of WS must occur between commands
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* to disable or enable the interface"
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*/
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j = 0;
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prev = ~S6_I2S_CUR_WS;
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for (i = 1000000; --i && j < 6; ) {
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cur = s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(channel))
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& S6_I2S_CUR_WS;
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if (prev != cur) {
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prev = cur;
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j++;
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}
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}
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if (j < 6)
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printk(KERN_WARNING "s6000-i2s: timeout waiting for WCLK\n");
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s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_ENABLE_IF);
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}
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static void s6000_i2s_stop_channel(struct s6000_i2s_dev *dev, int channel)
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{
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s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_DISABLE_IF);
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}
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static void s6000_i2s_start(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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int channel;
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channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
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dev->channel_out : dev->channel_in;
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s6000_i2s_start_channel(dev, channel);
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}
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static void s6000_i2s_stop(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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int channel;
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channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
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dev->channel_out : dev->channel_in;
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s6000_i2s_stop_channel(dev, channel);
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}
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static int s6000_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
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int after)
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{
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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if ((substream->stream == SNDRV_PCM_STREAM_CAPTURE) ^ !after)
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s6000_i2s_start(substream);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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if (!after)
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s6000_i2s_stop(substream);
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}
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return 0;
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}
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static unsigned int s6000_i2s_int_sources(struct s6000_i2s_dev *dev)
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{
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unsigned int pending;
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pending = s6_i2s_read_reg(dev, S6_I2S_INTERRUPT_RAW);
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pending &= S6_I2S_INT_ALIGNMENT |
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S6_I2S_INT_UNDERRUN |
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S6_I2S_INT_OVERRUN;
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s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR, pending);
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return pending;
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}
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static unsigned int s6000_i2s_check_xrun(struct snd_soc_dai *cpu_dai)
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{
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struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
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unsigned int errors;
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unsigned int ret;
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errors = s6000_i2s_int_sources(dev);
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if (likely(!errors))
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return 0;
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ret = 0;
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if (errors & S6_I2S_INT_ALIGNMENT)
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printk(KERN_ERR "s6000-i2s: WCLK misaligned\n");
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if (errors & S6_I2S_INT_UNDERRUN)
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ret |= 1 << SNDRV_PCM_STREAM_PLAYBACK;
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if (errors & S6_I2S_INT_OVERRUN)
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ret |= 1 << SNDRV_PCM_STREAM_CAPTURE;
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return ret;
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}
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static void s6000_i2s_wait_disabled(struct s6000_i2s_dev *dev)
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{
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int channel;
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int n = 50;
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for (channel = 0; channel < 2; channel++) {
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while (--n >= 0) {
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int v = s6_i2s_read_reg(dev, S6_I2S_ENABLE(channel));
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if ((v & S6_I2S_IS_ENABLED)
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|| !(v & (S6_I2S_DMA_ACTIVE | S6_I2S_IS_BUSY)))
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break;
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udelay(20);
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}
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}
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if (n < 0)
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printk(KERN_WARNING "s6000-i2s: timeout disabling interfaces");
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}
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static int s6000_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
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unsigned int fmt)
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{
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struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
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u32 w;
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switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
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case SND_SOC_DAIFMT_CBM_CFM:
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w = S6_I2S_SCK_IN | S6_I2S_WS_IN;
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break;
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case SND_SOC_DAIFMT_CBS_CFM:
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w = S6_I2S_SCK_OUT | S6_I2S_WS_IN;
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break;
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case SND_SOC_DAIFMT_CBM_CFS:
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w = S6_I2S_SCK_IN | S6_I2S_WS_OUT;
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break;
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case SND_SOC_DAIFMT_CBS_CFS:
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w = S6_I2S_SCK_OUT | S6_I2S_WS_OUT;
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break;
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default:
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return -EINVAL;
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}
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switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
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case SND_SOC_DAIFMT_NB_NF:
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w |= S6_I2S_LEFT_FIRST;
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break;
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case SND_SOC_DAIFMT_NB_IF:
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w |= S6_I2S_RIGHT_FIRST;
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break;
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default:
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return -EINVAL;
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}
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s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(0),
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S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
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s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(1),
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S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
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return 0;
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}
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static int s6000_i2s_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div)
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{
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struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
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if (!div || (div & 1) || div > (S6_I2S_DIV_MASK + 1) * 2)
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return -EINVAL;
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s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(div_id),
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S6_I2S_DIV_MASK, div / 2 - 1);
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return 0;
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}
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static int s6000_i2s_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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{
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struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
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int interf;
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u32 w = 0;
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if (dev->wide)
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interf = 0;
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else {
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w |= (((params_channels(params) - 2) / 2)
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<< S6_I2S_CHANNELS_SHIFT) & S6_I2S_CHANNELS_MASK;
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interf = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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? dev->channel_out : dev->channel_in;
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}
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S16_LE:
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w |= S6_I2S_16BIT | S6_I2S_MEM_16BIT;
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break;
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case SNDRV_PCM_FORMAT_S32_LE:
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w |= S6_I2S_32BIT | S6_I2S_MEM_32BIT;
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break;
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default:
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printk(KERN_WARNING "s6000-i2s: unsupported PCM format %x\n",
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params_format(params));
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return -EINVAL;
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}
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if (s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(interf))
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& S6_I2S_IS_ENABLED) {
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printk(KERN_ERR "s6000-i2s: interface already enabled\n");
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return -EBUSY;
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}
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s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(interf),
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S6_I2S_CHANNELS_MASK|S6_I2S_MEM_MASK|S6_I2S_BITS_MASK,
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w);
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return 0;
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}
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static int s6000_i2s_dai_probe(struct snd_soc_dai *dai)
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{
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struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
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struct s6000_snd_platform_data *pdata = dai->dev->platform_data;
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if (!pdata)
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return -EINVAL;
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dai->capture_dma_data = &dev->dma_params;
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dai->playback_dma_data = &dev->dma_params;
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dev->wide = pdata->wide;
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dev->channel_in = pdata->channel_in;
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dev->channel_out = pdata->channel_out;
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dev->lines_in = pdata->lines_in;
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dev->lines_out = pdata->lines_out;
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s6_i2s_write_reg(dev, S6_I2S_MODE,
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dev->wide ? S6_I2S_WIDE : S6_I2S_DUAL);
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if (dev->wide) {
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int i;
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if (dev->lines_in + dev->lines_out > S6_I2S_NUM_LINES)
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return -EINVAL;
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dev->channel_in = 0;
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dev->channel_out = 1;
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dai->driver->capture.channels_min = 2 * dev->lines_in;
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dai->driver->capture.channels_max = dai->driver->capture.channels_min;
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dai->driver->playback.channels_min = 2 * dev->lines_out;
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dai->driver->playback.channels_max = dai->driver->playback.channels_min;
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for (i = 0; i < dev->lines_out; i++)
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s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_OUT);
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for (; i < S6_I2S_NUM_LINES - dev->lines_in; i++)
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s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i),
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S6_I2S_UNUSED);
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for (; i < S6_I2S_NUM_LINES; i++)
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s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_IN);
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} else {
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unsigned int cfg[2] = {S6_I2S_UNUSED, S6_I2S_UNUSED};
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if (dev->lines_in > 1 || dev->lines_out > 1)
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return -EINVAL;
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dai->driver->capture.channels_min = 2 * dev->lines_in;
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dai->driver->capture.channels_max = 8 * dev->lines_in;
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dai->driver->playback.channels_min = 2 * dev->lines_out;
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dai->driver->playback.channels_max = 8 * dev->lines_out;
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if (dev->lines_in)
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cfg[dev->channel_in] = S6_I2S_IN;
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if (dev->lines_out)
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cfg[dev->channel_out] = S6_I2S_OUT;
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s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(0), cfg[0]);
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s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(1), cfg[1]);
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}
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if (dev->lines_out) {
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if (dev->lines_in) {
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if (!dev->dma_params.dma_out)
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return -ENODEV;
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} else {
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dev->dma_params.dma_out = dev->dma_params.dma_in;
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dev->dma_params.dma_in = 0;
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}
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}
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dev->dma_params.sif_in = dev->sifbase + (dev->channel_in ?
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S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
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dev->dma_params.sif_out = dev->sifbase + (dev->channel_out ?
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S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
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dev->dma_params.same_rate = pdata->same_rate | pdata->wide;
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return 0;
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}
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#define S6000_I2S_RATES (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
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SNDRV_PCM_RATE_8000_192000)
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#define S6000_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
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static struct snd_soc_dai_ops s6000_i2s_dai_ops = {
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.set_fmt = s6000_i2s_set_dai_fmt,
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.set_clkdiv = s6000_i2s_set_clkdiv,
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.hw_params = s6000_i2s_hw_params,
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};
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static struct snd_soc_dai_driver s6000_i2s_dai = {
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.probe = s6000_i2s_dai_probe,
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.playback = {
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.channels_min = 2,
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.channels_max = 8,
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.formats = S6000_I2S_FORMATS,
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.rates = S6000_I2S_RATES,
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.rate_min = 0,
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.rate_max = 1562500,
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},
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.capture = {
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.channels_min = 2,
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.channels_max = 8,
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.formats = S6000_I2S_FORMATS,
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.rates = S6000_I2S_RATES,
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.rate_min = 0,
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.rate_max = 1562500,
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|
},
|
|
.ops = &s6000_i2s_dai_ops,
|
|
};
|
|
|
|
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, resource_size(scbmem),
|
|
pdev->name);
|
|
if (!region) {
|
|
dev_err(&pdev->dev, "I2S SCB region already claimed\n");
|
|
ret = -EBUSY;
|
|
goto err_release_none;
|
|
}
|
|
|
|
mmio = ioremap(scbmem->start, resource_size(scbmem));
|
|
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, resource_size(sifmem),
|
|
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, resource_size(dma1),
|
|
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, resource_size(dma2),
|
|
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;
|
|
}
|
|
dev_set_drvdata(&pdev->dev, dev);
|
|
|
|
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(&pdev->dev, &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, resource_size(dma2));
|
|
err_release_dma1:
|
|
release_mem_region(dma1->start, resource_size(dma1));
|
|
err_release_sif:
|
|
release_mem_region(sifmem->start, resource_size(sifmem));
|
|
err_release_map:
|
|
iounmap(mmio);
|
|
err_release_scb:
|
|
release_mem_region(scbmem->start, resource_size(scbmem));
|
|
err_release_none:
|
|
return ret;
|
|
}
|
|
|
|
static void __devexit s6000_i2s_remove(struct platform_device *pdev)
|
|
{
|
|
struct s6000_i2s_dev *dev = dev_get_drvdata(&pdev->dev);
|
|
struct resource *region;
|
|
void __iomem *mmio = dev->scbbase;
|
|
|
|
snd_soc_unregister_dai(&pdev->dev);
|
|
|
|
s6000_i2s_stop_channel(dev, 0);
|
|
s6000_i2s_stop_channel(dev, 1);
|
|
|
|
s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
|
|
kfree(dev);
|
|
|
|
region = platform_get_resource(pdev, IORESOURCE_DMA, 0);
|
|
release_mem_region(region->start, resource_size(region));
|
|
|
|
region = platform_get_resource(pdev, IORESOURCE_DMA, 1);
|
|
if (region)
|
|
release_mem_region(region->start, resource_size(region));
|
|
|
|
region = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(region->start, resource_size(region));
|
|
|
|
iounmap(mmio);
|
|
region = platform_get_resource(pdev, IORESOURCE_IO, 0);
|
|
release_mem_region(region->start, resource_size(region));
|
|
}
|
|
|
|
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");
|