645 lines
19 KiB
C
645 lines
19 KiB
C
/*
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* ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor
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*
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* Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
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* Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.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/slab.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/clk.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 <mach/asp.h>
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#include "davinci-pcm.h"
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/*
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* NOTE: terminology here is confusing.
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*
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* - This driver supports the "Audio Serial Port" (ASP),
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* found on dm6446, dm355, and other DaVinci chips.
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*
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* - But it labels it a "Multi-channel Buffered Serial Port"
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* (McBSP) as on older chips like the dm642 ... which was
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* backward-compatible, possibly explaining that confusion.
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*
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* - OMAP chips have a controller called McBSP, which is
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* incompatible with the DaVinci flavor of McBSP.
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*
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* - Newer DaVinci chips have a controller called McASP,
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* incompatible with ASP and with either McBSP.
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*
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* In short: this uses ASP to implement I2S, not McBSP.
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* And it won't be the only DaVinci implemention of I2S.
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*/
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#define DAVINCI_MCBSP_DRR_REG 0x00
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#define DAVINCI_MCBSP_DXR_REG 0x04
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#define DAVINCI_MCBSP_SPCR_REG 0x08
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#define DAVINCI_MCBSP_RCR_REG 0x0c
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#define DAVINCI_MCBSP_XCR_REG 0x10
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#define DAVINCI_MCBSP_SRGR_REG 0x14
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#define DAVINCI_MCBSP_PCR_REG 0x24
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#define DAVINCI_MCBSP_SPCR_RRST (1 << 0)
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#define DAVINCI_MCBSP_SPCR_RINTM(v) ((v) << 4)
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#define DAVINCI_MCBSP_SPCR_XRST (1 << 16)
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#define DAVINCI_MCBSP_SPCR_XINTM(v) ((v) << 20)
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#define DAVINCI_MCBSP_SPCR_GRST (1 << 22)
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#define DAVINCI_MCBSP_SPCR_FRST (1 << 23)
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#define DAVINCI_MCBSP_SPCR_FREE (1 << 25)
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#define DAVINCI_MCBSP_RCR_RWDLEN1(v) ((v) << 5)
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#define DAVINCI_MCBSP_RCR_RFRLEN1(v) ((v) << 8)
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#define DAVINCI_MCBSP_RCR_RDATDLY(v) ((v) << 16)
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#define DAVINCI_MCBSP_RCR_RFIG (1 << 18)
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#define DAVINCI_MCBSP_RCR_RWDLEN2(v) ((v) << 21)
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#define DAVINCI_MCBSP_XCR_XWDLEN1(v) ((v) << 5)
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#define DAVINCI_MCBSP_XCR_XFRLEN1(v) ((v) << 8)
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#define DAVINCI_MCBSP_XCR_XDATDLY(v) ((v) << 16)
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#define DAVINCI_MCBSP_XCR_XFIG (1 << 18)
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#define DAVINCI_MCBSP_XCR_XWDLEN2(v) ((v) << 21)
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#define DAVINCI_MCBSP_SRGR_FWID(v) ((v) << 8)
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#define DAVINCI_MCBSP_SRGR_FPER(v) ((v) << 16)
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#define DAVINCI_MCBSP_SRGR_FSGM (1 << 28)
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#define DAVINCI_MCBSP_PCR_CLKRP (1 << 0)
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#define DAVINCI_MCBSP_PCR_CLKXP (1 << 1)
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#define DAVINCI_MCBSP_PCR_FSRP (1 << 2)
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#define DAVINCI_MCBSP_PCR_FSXP (1 << 3)
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#define DAVINCI_MCBSP_PCR_SCLKME (1 << 7)
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#define DAVINCI_MCBSP_PCR_CLKRM (1 << 8)
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#define DAVINCI_MCBSP_PCR_CLKXM (1 << 9)
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#define DAVINCI_MCBSP_PCR_FSRM (1 << 10)
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#define DAVINCI_MCBSP_PCR_FSXM (1 << 11)
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enum {
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DAVINCI_MCBSP_WORD_8 = 0,
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DAVINCI_MCBSP_WORD_12,
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DAVINCI_MCBSP_WORD_16,
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DAVINCI_MCBSP_WORD_20,
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DAVINCI_MCBSP_WORD_24,
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DAVINCI_MCBSP_WORD_32,
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};
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static const unsigned char data_type[SNDRV_PCM_FORMAT_S32_LE + 1] = {
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[SNDRV_PCM_FORMAT_S8] = 1,
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[SNDRV_PCM_FORMAT_S16_LE] = 2,
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[SNDRV_PCM_FORMAT_S32_LE] = 4,
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};
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static const unsigned char asp_word_length[SNDRV_PCM_FORMAT_S32_LE + 1] = {
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[SNDRV_PCM_FORMAT_S8] = DAVINCI_MCBSP_WORD_8,
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[SNDRV_PCM_FORMAT_S16_LE] = DAVINCI_MCBSP_WORD_16,
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[SNDRV_PCM_FORMAT_S32_LE] = DAVINCI_MCBSP_WORD_32,
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};
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static const unsigned char double_fmt[SNDRV_PCM_FORMAT_S32_LE + 1] = {
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[SNDRV_PCM_FORMAT_S8] = SNDRV_PCM_FORMAT_S16_LE,
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[SNDRV_PCM_FORMAT_S16_LE] = SNDRV_PCM_FORMAT_S32_LE,
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};
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struct davinci_mcbsp_dev {
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struct davinci_pcm_dma_params dma_params[2];
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void __iomem *base;
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#define MOD_DSP_A 0
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#define MOD_DSP_B 1
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int mode;
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u32 pcr;
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struct clk *clk;
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/*
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* Combining both channels into 1 element will at least double the
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* amount of time between servicing the dma channel, increase
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* effiency, and reduce the chance of overrun/underrun. But,
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* it will result in the left & right channels being swapped.
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*
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* If relabeling the left and right channels is not possible,
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* you may want to let the codec know to swap them back.
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*
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* It may allow x10 the amount of time to service dma requests,
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* if the codec is master and is using an unnecessarily fast bit clock
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* (ie. tlvaic23b), independent of the sample rate. So, having an
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* entire frame at once means it can be serviced at the sample rate
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* instead of the bit clock rate.
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*
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* In the now unlikely case that an underrun still
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* occurs, both the left and right samples will be repeated
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* so that no pops are heard, and the left and right channels
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* won't end up being swapped because of the underrun.
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*/
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unsigned enable_channel_combine:1;
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};
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static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
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int reg, u32 val)
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{
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__raw_writel(val, dev->base + reg);
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}
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static inline u32 davinci_mcbsp_read_reg(struct davinci_mcbsp_dev *dev, int reg)
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{
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return __raw_readl(dev->base + reg);
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}
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static void toggle_clock(struct davinci_mcbsp_dev *dev, int playback)
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{
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u32 m = playback ? DAVINCI_MCBSP_PCR_CLKXP : DAVINCI_MCBSP_PCR_CLKRP;
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/* The clock needs to toggle to complete reset.
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* So, fake it by toggling the clk polarity.
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*/
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, dev->pcr ^ m);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, dev->pcr);
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}
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static void davinci_mcbsp_start(struct davinci_mcbsp_dev *dev,
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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 snd_soc_device *socdev = rtd->socdev;
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struct snd_soc_platform *platform = socdev->card->platform;
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int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
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u32 spcr;
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u32 mask = playback ? DAVINCI_MCBSP_SPCR_XRST : DAVINCI_MCBSP_SPCR_RRST;
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spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
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if (spcr & mask) {
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/* start off disabled */
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG,
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spcr & ~mask);
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toggle_clock(dev, playback);
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}
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if (dev->pcr & (DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM |
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DAVINCI_MCBSP_PCR_CLKXM | DAVINCI_MCBSP_PCR_CLKRM)) {
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/* Start the sample generator */
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spcr |= DAVINCI_MCBSP_SPCR_GRST;
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
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}
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if (playback) {
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/* Stop the DMA to avoid data loss */
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/* while the transmitter is out of reset to handle XSYNCERR */
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if (platform->pcm_ops->trigger) {
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int ret = platform->pcm_ops->trigger(substream,
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SNDRV_PCM_TRIGGER_STOP);
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if (ret < 0)
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printk(KERN_DEBUG "Playback DMA stop failed\n");
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}
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/* Enable the transmitter */
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spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
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spcr |= DAVINCI_MCBSP_SPCR_XRST;
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
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/* wait for any unexpected frame sync error to occur */
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udelay(100);
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/* Disable the transmitter to clear any outstanding XSYNCERR */
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spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
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spcr &= ~DAVINCI_MCBSP_SPCR_XRST;
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
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toggle_clock(dev, playback);
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/* Restart the DMA */
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if (platform->pcm_ops->trigger) {
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int ret = platform->pcm_ops->trigger(substream,
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SNDRV_PCM_TRIGGER_START);
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if (ret < 0)
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printk(KERN_DEBUG "Playback DMA start failed\n");
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}
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}
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/* Enable transmitter or receiver */
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spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
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spcr |= mask;
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if (dev->pcr & (DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM)) {
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/* Start frame sync */
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spcr |= DAVINCI_MCBSP_SPCR_FRST;
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}
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
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}
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static void davinci_mcbsp_stop(struct davinci_mcbsp_dev *dev, int playback)
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{
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u32 spcr;
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/* Reset transmitter/receiver and sample rate/frame sync generators */
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spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
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spcr &= ~(DAVINCI_MCBSP_SPCR_GRST | DAVINCI_MCBSP_SPCR_FRST);
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spcr &= playback ? ~DAVINCI_MCBSP_SPCR_XRST : ~DAVINCI_MCBSP_SPCR_RRST;
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
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toggle_clock(dev, playback);
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}
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#define DEFAULT_BITPERSAMPLE 16
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static int davinci_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 davinci_mcbsp_dev *dev = cpu_dai->private_data;
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unsigned int pcr;
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unsigned int srgr;
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srgr = DAVINCI_MCBSP_SRGR_FSGM |
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DAVINCI_MCBSP_SRGR_FPER(DEFAULT_BITPERSAMPLE * 2 - 1) |
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DAVINCI_MCBSP_SRGR_FWID(DEFAULT_BITPERSAMPLE - 1);
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/* set master/slave audio interface */
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switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
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case SND_SOC_DAIFMT_CBS_CFS:
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/* cpu is master */
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pcr = DAVINCI_MCBSP_PCR_FSXM |
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DAVINCI_MCBSP_PCR_FSRM |
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DAVINCI_MCBSP_PCR_CLKXM |
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DAVINCI_MCBSP_PCR_CLKRM;
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break;
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case SND_SOC_DAIFMT_CBM_CFS:
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/* McBSP CLKR pin is the input for the Sample Rate Generator.
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* McBSP FSR and FSX are driven by the Sample Rate Generator. */
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pcr = DAVINCI_MCBSP_PCR_SCLKME |
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DAVINCI_MCBSP_PCR_FSXM |
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DAVINCI_MCBSP_PCR_FSRM;
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break;
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case SND_SOC_DAIFMT_CBM_CFM:
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/* codec is master */
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pcr = 0;
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break;
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default:
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printk(KERN_ERR "%s:bad master\n", __func__);
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return -EINVAL;
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}
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/* interface format */
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switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_I2S:
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/* Davinci doesn't support TRUE I2S, but some codecs will have
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* the left and right channels contiguous. This allows
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* dsp_a mode to be used with an inverted normal frame clk.
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* If your codec is master and does not have contiguous
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* channels, then you will have sound on only one channel.
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* Try using a different mode, or codec as slave.
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*
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* The TLV320AIC33 is an example of a codec where this works.
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* It has a variable bit clock frequency allowing it to have
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* valid data on every bit clock.
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*
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* The TLV320AIC23 is an example of a codec where this does not
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* work. It has a fixed bit clock frequency with progressively
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* more empty bit clock slots between channels as the sample
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* rate is lowered.
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*/
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fmt ^= SND_SOC_DAIFMT_NB_IF;
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case SND_SOC_DAIFMT_DSP_A:
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dev->mode = MOD_DSP_A;
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break;
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case SND_SOC_DAIFMT_DSP_B:
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dev->mode = MOD_DSP_B;
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break;
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default:
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printk(KERN_ERR "%s:bad format\n", __func__);
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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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/* CLKRP Receive clock polarity,
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* 1 - sampled on rising edge of CLKR
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* valid on rising edge
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* CLKXP Transmit clock polarity,
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* 1 - clocked on falling edge of CLKX
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* valid on rising edge
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* FSRP Receive frame sync pol, 0 - active high
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* FSXP Transmit frame sync pol, 0 - active high
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*/
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pcr |= (DAVINCI_MCBSP_PCR_CLKXP | DAVINCI_MCBSP_PCR_CLKRP);
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break;
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case SND_SOC_DAIFMT_IB_IF:
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/* CLKRP Receive clock polarity,
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* 0 - sampled on falling edge of CLKR
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* valid on falling edge
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* CLKXP Transmit clock polarity,
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* 0 - clocked on rising edge of CLKX
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* valid on falling edge
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* FSRP Receive frame sync pol, 1 - active low
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* FSXP Transmit frame sync pol, 1 - active low
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*/
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pcr |= (DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
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break;
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case SND_SOC_DAIFMT_NB_IF:
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/* CLKRP Receive clock polarity,
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* 1 - sampled on rising edge of CLKR
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* valid on rising edge
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* CLKXP Transmit clock polarity,
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* 1 - clocked on falling edge of CLKX
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* valid on rising edge
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* FSRP Receive frame sync pol, 1 - active low
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* FSXP Transmit frame sync pol, 1 - active low
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*/
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pcr |= (DAVINCI_MCBSP_PCR_CLKXP | DAVINCI_MCBSP_PCR_CLKRP |
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DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
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break;
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case SND_SOC_DAIFMT_IB_NF:
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/* CLKRP Receive clock polarity,
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* 0 - sampled on falling edge of CLKR
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* valid on falling edge
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* CLKXP Transmit clock polarity,
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* 0 - clocked on rising edge of CLKX
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* valid on falling edge
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* FSRP Receive frame sync pol, 0 - active high
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* FSXP Transmit frame sync pol, 0 - active high
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*/
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break;
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default:
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return -EINVAL;
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}
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr);
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dev->pcr = pcr;
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, pcr);
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return 0;
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}
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static int davinci_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 davinci_mcbsp_dev *dev = dai->private_data;
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struct davinci_pcm_dma_params *dma_params =
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&dev->dma_params[substream->stream];
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struct snd_interval *i = NULL;
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int mcbsp_word_length;
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unsigned int rcr, xcr, srgr;
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u32 spcr;
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snd_pcm_format_t fmt;
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unsigned element_cnt = 1;
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/* general line settings */
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spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
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spcr |= DAVINCI_MCBSP_SPCR_RINTM(3) | DAVINCI_MCBSP_SPCR_FREE;
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
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} else {
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spcr |= DAVINCI_MCBSP_SPCR_XINTM(3) | DAVINCI_MCBSP_SPCR_FREE;
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
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}
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i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
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srgr = DAVINCI_MCBSP_SRGR_FSGM;
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srgr |= DAVINCI_MCBSP_SRGR_FWID(snd_interval_value(i) - 1);
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i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_FRAME_BITS);
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srgr |= DAVINCI_MCBSP_SRGR_FPER(snd_interval_value(i) - 1);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr);
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rcr = DAVINCI_MCBSP_RCR_RFIG;
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xcr = DAVINCI_MCBSP_XCR_XFIG;
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if (dev->mode == MOD_DSP_B) {
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rcr |= DAVINCI_MCBSP_RCR_RDATDLY(0);
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xcr |= DAVINCI_MCBSP_XCR_XDATDLY(0);
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} else {
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rcr |= DAVINCI_MCBSP_RCR_RDATDLY(1);
|
|
xcr |= DAVINCI_MCBSP_XCR_XDATDLY(1);
|
|
}
|
|
/* Determine xfer data type */
|
|
fmt = params_format(params);
|
|
if ((fmt > SNDRV_PCM_FORMAT_S32_LE) || !data_type[fmt]) {
|
|
printk(KERN_WARNING "davinci-i2s: unsupported PCM format\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (params_channels(params) == 2) {
|
|
element_cnt = 2;
|
|
if (double_fmt[fmt] && dev->enable_channel_combine) {
|
|
element_cnt = 1;
|
|
fmt = double_fmt[fmt];
|
|
}
|
|
}
|
|
dma_params->acnt = dma_params->data_type = data_type[fmt];
|
|
dma_params->fifo_level = 0;
|
|
mcbsp_word_length = asp_word_length[fmt];
|
|
rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(element_cnt - 1);
|
|
xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(element_cnt - 1);
|
|
|
|
rcr |= DAVINCI_MCBSP_RCR_RWDLEN1(mcbsp_word_length) |
|
|
DAVINCI_MCBSP_RCR_RWDLEN2(mcbsp_word_length);
|
|
xcr |= DAVINCI_MCBSP_XCR_XWDLEN1(mcbsp_word_length) |
|
|
DAVINCI_MCBSP_XCR_XWDLEN2(mcbsp_word_length);
|
|
|
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
|
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG, xcr);
|
|
else
|
|
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG, rcr);
|
|
return 0;
|
|
}
|
|
|
|
static int davinci_i2s_prepare(struct snd_pcm_substream *substream,
|
|
struct snd_soc_dai *dai)
|
|
{
|
|
struct davinci_mcbsp_dev *dev = dai->private_data;
|
|
int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
|
|
davinci_mcbsp_stop(dev, playback);
|
|
if ((dev->pcr & DAVINCI_MCBSP_PCR_FSXM) == 0) {
|
|
/* codec is master */
|
|
davinci_mcbsp_start(dev, substream);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int davinci_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
|
|
struct snd_soc_dai *dai)
|
|
{
|
|
struct davinci_mcbsp_dev *dev = dai->private_data;
|
|
int ret = 0;
|
|
int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
|
|
if ((dev->pcr & DAVINCI_MCBSP_PCR_FSXM) == 0)
|
|
return 0; /* return if codec is master */
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
case SNDRV_PCM_TRIGGER_RESUME:
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
|
davinci_mcbsp_start(dev, substream);
|
|
break;
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
|
davinci_mcbsp_stop(dev, playback);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void davinci_i2s_shutdown(struct snd_pcm_substream *substream,
|
|
struct snd_soc_dai *dai)
|
|
{
|
|
struct davinci_mcbsp_dev *dev = dai->private_data;
|
|
int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
|
|
davinci_mcbsp_stop(dev, playback);
|
|
}
|
|
|
|
#define DAVINCI_I2S_RATES SNDRV_PCM_RATE_8000_96000
|
|
|
|
static struct snd_soc_dai_ops davinci_i2s_dai_ops = {
|
|
.shutdown = davinci_i2s_shutdown,
|
|
.prepare = davinci_i2s_prepare,
|
|
.trigger = davinci_i2s_trigger,
|
|
.hw_params = davinci_i2s_hw_params,
|
|
.set_fmt = davinci_i2s_set_dai_fmt,
|
|
|
|
};
|
|
|
|
struct snd_soc_dai davinci_i2s_dai = {
|
|
.name = "davinci-i2s",
|
|
.id = 0,
|
|
.playback = {
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.rates = DAVINCI_I2S_RATES,
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
|
|
.capture = {
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.rates = DAVINCI_I2S_RATES,
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
|
|
.ops = &davinci_i2s_dai_ops,
|
|
|
|
};
|
|
EXPORT_SYMBOL_GPL(davinci_i2s_dai);
|
|
|
|
static int davinci_i2s_probe(struct platform_device *pdev)
|
|
{
|
|
struct snd_platform_data *pdata = pdev->dev.platform_data;
|
|
struct davinci_mcbsp_dev *dev;
|
|
struct resource *mem, *ioarea, *res;
|
|
int ret;
|
|
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!mem) {
|
|
dev_err(&pdev->dev, "no mem resource?\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
ioarea = request_mem_region(mem->start, (mem->end - mem->start) + 1,
|
|
pdev->name);
|
|
if (!ioarea) {
|
|
dev_err(&pdev->dev, "McBSP region already claimed\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
dev = kzalloc(sizeof(struct davinci_mcbsp_dev), GFP_KERNEL);
|
|
if (!dev) {
|
|
ret = -ENOMEM;
|
|
goto err_release_region;
|
|
}
|
|
if (pdata) {
|
|
dev->enable_channel_combine = pdata->enable_channel_combine;
|
|
dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].sram_size =
|
|
pdata->sram_size_playback;
|
|
dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].sram_size =
|
|
pdata->sram_size_capture;
|
|
}
|
|
dev->clk = clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(dev->clk)) {
|
|
ret = -ENODEV;
|
|
goto err_free_mem;
|
|
}
|
|
clk_enable(dev->clk);
|
|
|
|
dev->base = (void __iomem *)IO_ADDRESS(mem->start);
|
|
|
|
dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].dma_addr =
|
|
(dma_addr_t)(io_v2p(dev->base) + DAVINCI_MCBSP_DXR_REG);
|
|
|
|
dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].dma_addr =
|
|
(dma_addr_t)(io_v2p(dev->base) + DAVINCI_MCBSP_DRR_REG);
|
|
|
|
/* first TX, then RX */
|
|
res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
|
|
if (!res) {
|
|
dev_err(&pdev->dev, "no DMA resource\n");
|
|
ret = -ENXIO;
|
|
goto err_free_mem;
|
|
}
|
|
dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].channel = res->start;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
|
|
if (!res) {
|
|
dev_err(&pdev->dev, "no DMA resource\n");
|
|
ret = -ENXIO;
|
|
goto err_free_mem;
|
|
}
|
|
dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].channel = res->start;
|
|
|
|
davinci_i2s_dai.private_data = dev;
|
|
davinci_i2s_dai.capture.dma_data = dev->dma_params;
|
|
davinci_i2s_dai.playback.dma_data = dev->dma_params;
|
|
ret = snd_soc_register_dai(&davinci_i2s_dai);
|
|
if (ret != 0)
|
|
goto err_free_mem;
|
|
|
|
return 0;
|
|
|
|
err_free_mem:
|
|
kfree(dev);
|
|
err_release_region:
|
|
release_mem_region(mem->start, (mem->end - mem->start) + 1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int davinci_i2s_remove(struct platform_device *pdev)
|
|
{
|
|
struct davinci_mcbsp_dev *dev = davinci_i2s_dai.private_data;
|
|
struct resource *mem;
|
|
|
|
snd_soc_unregister_dai(&davinci_i2s_dai);
|
|
clk_disable(dev->clk);
|
|
clk_put(dev->clk);
|
|
dev->clk = NULL;
|
|
kfree(dev);
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(mem->start, (mem->end - mem->start) + 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver davinci_mcbsp_driver = {
|
|
.probe = davinci_i2s_probe,
|
|
.remove = davinci_i2s_remove,
|
|
.driver = {
|
|
.name = "davinci-asp",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init davinci_i2s_init(void)
|
|
{
|
|
return platform_driver_register(&davinci_mcbsp_driver);
|
|
}
|
|
module_init(davinci_i2s_init);
|
|
|
|
static void __exit davinci_i2s_exit(void)
|
|
{
|
|
platform_driver_unregister(&davinci_mcbsp_driver);
|
|
}
|
|
module_exit(davinci_i2s_exit);
|
|
|
|
MODULE_AUTHOR("Vladimir Barinov");
|
|
MODULE_DESCRIPTION("TI DAVINCI I2S (McBSP) SoC Interface");
|
|
MODULE_LICENSE("GPL");
|