/* * ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor * * Author: Vladimir Barinov, * Copyright: (C) 2007 MontaVista Software, Inc., * * 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 #include #include #include #include #include #include #include #include #include #include #include #include "davinci-pcm.h" /* * NOTE: terminology here is confusing. * * - This driver supports the "Audio Serial Port" (ASP), * found on dm6446, dm355, and other DaVinci chips. * * - But it labels it a "Multi-channel Buffered Serial Port" * (McBSP) as on older chips like the dm642 ... which was * backward-compatible, possibly explaining that confusion. * * - OMAP chips have a controller called McBSP, which is * incompatible with the DaVinci flavor of McBSP. * * - Newer DaVinci chips have a controller called McASP, * incompatible with ASP and with either McBSP. * * In short: this uses ASP to implement I2S, not McBSP. * And it won't be the only DaVinci implemention of I2S. */ #define DAVINCI_MCBSP_DRR_REG 0x00 #define DAVINCI_MCBSP_DXR_REG 0x04 #define DAVINCI_MCBSP_SPCR_REG 0x08 #define DAVINCI_MCBSP_RCR_REG 0x0c #define DAVINCI_MCBSP_XCR_REG 0x10 #define DAVINCI_MCBSP_SRGR_REG 0x14 #define DAVINCI_MCBSP_PCR_REG 0x24 #define DAVINCI_MCBSP_SPCR_RRST (1 << 0) #define DAVINCI_MCBSP_SPCR_RINTM(v) ((v) << 4) #define DAVINCI_MCBSP_SPCR_XRST (1 << 16) #define DAVINCI_MCBSP_SPCR_XINTM(v) ((v) << 20) #define DAVINCI_MCBSP_SPCR_GRST (1 << 22) #define DAVINCI_MCBSP_SPCR_FRST (1 << 23) #define DAVINCI_MCBSP_SPCR_FREE (1 << 25) #define DAVINCI_MCBSP_RCR_RWDLEN1(v) ((v) << 5) #define DAVINCI_MCBSP_RCR_RFRLEN1(v) ((v) << 8) #define DAVINCI_MCBSP_RCR_RDATDLY(v) ((v) << 16) #define DAVINCI_MCBSP_RCR_RFIG (1 << 18) #define DAVINCI_MCBSP_RCR_RWDLEN2(v) ((v) << 21) #define DAVINCI_MCBSP_XCR_XWDLEN1(v) ((v) << 5) #define DAVINCI_MCBSP_XCR_XFRLEN1(v) ((v) << 8) #define DAVINCI_MCBSP_XCR_XDATDLY(v) ((v) << 16) #define DAVINCI_MCBSP_XCR_XFIG (1 << 18) #define DAVINCI_MCBSP_XCR_XWDLEN2(v) ((v) << 21) #define DAVINCI_MCBSP_SRGR_FWID(v) ((v) << 8) #define DAVINCI_MCBSP_SRGR_FPER(v) ((v) << 16) #define DAVINCI_MCBSP_SRGR_FSGM (1 << 28) #define DAVINCI_MCBSP_PCR_CLKRP (1 << 0) #define DAVINCI_MCBSP_PCR_CLKXP (1 << 1) #define DAVINCI_MCBSP_PCR_FSRP (1 << 2) #define DAVINCI_MCBSP_PCR_FSXP (1 << 3) #define DAVINCI_MCBSP_PCR_SCLKME (1 << 7) #define DAVINCI_MCBSP_PCR_CLKRM (1 << 8) #define DAVINCI_MCBSP_PCR_CLKXM (1 << 9) #define DAVINCI_MCBSP_PCR_FSRM (1 << 10) #define DAVINCI_MCBSP_PCR_FSXM (1 << 11) enum { DAVINCI_MCBSP_WORD_8 = 0, DAVINCI_MCBSP_WORD_12, DAVINCI_MCBSP_WORD_16, DAVINCI_MCBSP_WORD_20, DAVINCI_MCBSP_WORD_24, DAVINCI_MCBSP_WORD_32, }; static struct davinci_pcm_dma_params davinci_i2s_pcm_out = { .name = "I2S PCM Stereo out", }; static struct davinci_pcm_dma_params davinci_i2s_pcm_in = { .name = "I2S PCM Stereo in", }; struct davinci_mcbsp_dev { void __iomem *base; #define MOD_DSP_A 0 #define MOD_DSP_B 1 int mode; u32 pcr; struct clk *clk; struct davinci_pcm_dma_params *dma_params[2]; }; static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev, int reg, u32 val) { __raw_writel(val, dev->base + reg); } static inline u32 davinci_mcbsp_read_reg(struct davinci_mcbsp_dev *dev, int reg) { return __raw_readl(dev->base + reg); } static void toggle_clock(struct davinci_mcbsp_dev *dev, int playback) { u32 m = playback ? DAVINCI_MCBSP_PCR_CLKXP : DAVINCI_MCBSP_PCR_CLKRP; /* The clock needs to toggle to complete reset. * So, fake it by toggling the clk polarity. */ davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, dev->pcr ^ m); davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, dev->pcr); } static void davinci_mcbsp_start(struct davinci_mcbsp_dev *dev, struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_soc_device *socdev = rtd->socdev; struct snd_soc_platform *platform = socdev->card->platform; int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); u32 spcr; u32 mask = playback ? DAVINCI_MCBSP_SPCR_XRST : DAVINCI_MCBSP_SPCR_RRST; spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG); if (spcr & mask) { /* start off disabled */ davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr & ~mask); toggle_clock(dev, playback); } if (dev->pcr & (DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM | DAVINCI_MCBSP_PCR_CLKXM | DAVINCI_MCBSP_PCR_CLKRM)) { /* Start the sample generator */ spcr |= DAVINCI_MCBSP_SPCR_GRST; davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr); } if (playback) { /* Stop the DMA to avoid data loss */ /* while the transmitter is out of reset to handle XSYNCERR */ if (platform->pcm_ops->trigger) { int ret = platform->pcm_ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); if (ret < 0) printk(KERN_DEBUG "Playback DMA stop failed\n"); } /* Enable the transmitter */ spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG); spcr |= DAVINCI_MCBSP_SPCR_XRST; davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr); /* wait for any unexpected frame sync error to occur */ udelay(100); /* Disable the transmitter to clear any outstanding XSYNCERR */ spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG); spcr &= ~DAVINCI_MCBSP_SPCR_XRST; davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr); toggle_clock(dev, playback); /* Restart the DMA */ if (platform->pcm_ops->trigger) { int ret = platform->pcm_ops->trigger(substream, SNDRV_PCM_TRIGGER_START); if (ret < 0) printk(KERN_DEBUG "Playback DMA start failed\n"); } } /* Enable transmitter or receiver */ spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG); spcr |= mask; if (dev->pcr & (DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM)) { /* Start frame sync */ spcr |= DAVINCI_MCBSP_SPCR_FRST; } davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr); } static void davinci_mcbsp_stop(struct davinci_mcbsp_dev *dev, int playback) { u32 spcr; /* Reset transmitter/receiver and sample rate/frame sync generators */ spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG); spcr &= ~(DAVINCI_MCBSP_SPCR_GRST | DAVINCI_MCBSP_SPCR_FRST); spcr &= playback ? ~DAVINCI_MCBSP_SPCR_XRST : ~DAVINCI_MCBSP_SPCR_RRST; davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr); toggle_clock(dev, playback); } static int davinci_i2s_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct davinci_mcbsp_dev *dev = cpu_dai->private_data; cpu_dai->dma_data = dev->dma_params[substream->stream]; return 0; } #define DEFAULT_BITPERSAMPLE 16 static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) { struct davinci_mcbsp_dev *dev = cpu_dai->private_data; unsigned int pcr; unsigned int srgr; srgr = DAVINCI_MCBSP_SRGR_FSGM | DAVINCI_MCBSP_SRGR_FPER(DEFAULT_BITPERSAMPLE * 2 - 1) | DAVINCI_MCBSP_SRGR_FWID(DEFAULT_BITPERSAMPLE - 1); /* set master/slave audio interface */ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { case SND_SOC_DAIFMT_CBS_CFS: /* cpu is master */ pcr = DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM | DAVINCI_MCBSP_PCR_CLKXM | DAVINCI_MCBSP_PCR_CLKRM; break; case SND_SOC_DAIFMT_CBM_CFS: /* McBSP CLKR pin is the input for the Sample Rate Generator. * McBSP FSR and FSX are driven by the Sample Rate Generator. */ pcr = DAVINCI_MCBSP_PCR_SCLKME | DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM; break; case SND_SOC_DAIFMT_CBM_CFM: /* codec is master */ pcr = 0; break; default: printk(KERN_ERR "%s:bad master\n", __func__); return -EINVAL; } /* interface format */ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { case SND_SOC_DAIFMT_I2S: /* Davinci doesn't support TRUE I2S, but some codecs will have * the left and right channels contiguous. This allows * dsp_a mode to be used with an inverted normal frame clk. * If your codec is master and does not have contiguous * channels, then you will have sound on only one channel. * Try using a different mode, or codec as slave. * * The TLV320AIC33 is an example of a codec where this works. * It has a variable bit clock frequency allowing it to have * valid data on every bit clock. * * The TLV320AIC23 is an example of a codec where this does not * work. It has a fixed bit clock frequency with progressively * more empty bit clock slots between channels as the sample * rate is lowered. */ fmt ^= SND_SOC_DAIFMT_NB_IF; case SND_SOC_DAIFMT_DSP_A: dev->mode = MOD_DSP_A; break; case SND_SOC_DAIFMT_DSP_B: dev->mode = MOD_DSP_B; break; default: printk(KERN_ERR "%s:bad format\n", __func__); return -EINVAL; } switch (fmt & SND_SOC_DAIFMT_INV_MASK) { case SND_SOC_DAIFMT_NB_NF: /* CLKRP Receive clock polarity, * 1 - sampled on rising edge of CLKR * valid on rising edge * CLKXP Transmit clock polarity, * 1 - clocked on falling edge of CLKX * valid on rising edge * FSRP Receive frame sync pol, 0 - active high * FSXP Transmit frame sync pol, 0 - active high */ pcr |= (DAVINCI_MCBSP_PCR_CLKXP | DAVINCI_MCBSP_PCR_CLKRP); break; case SND_SOC_DAIFMT_IB_IF: /* CLKRP Receive clock polarity, * 0 - sampled on falling edge of CLKR * valid on falling edge * CLKXP Transmit clock polarity, * 0 - clocked on rising edge of CLKX * valid on falling edge * FSRP Receive frame sync pol, 1 - active low * FSXP Transmit frame sync pol, 1 - active low */ pcr |= (DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP); break; case SND_SOC_DAIFMT_NB_IF: /* CLKRP Receive clock polarity, * 1 - sampled on rising edge of CLKR * valid on rising edge * CLKXP Transmit clock polarity, * 1 - clocked on falling edge of CLKX * valid on rising edge * FSRP Receive frame sync pol, 1 - active low * FSXP Transmit frame sync pol, 1 - active low */ pcr |= (DAVINCI_MCBSP_PCR_CLKXP | DAVINCI_MCBSP_PCR_CLKRP | DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP); break; case SND_SOC_DAIFMT_IB_NF: /* CLKRP Receive clock polarity, * 0 - sampled on falling edge of CLKR * valid on falling edge * CLKXP Transmit clock polarity, * 0 - clocked on rising edge of CLKX * valid on falling edge * FSRP Receive frame sync pol, 0 - active high * FSXP Transmit frame sync pol, 0 - active high */ break; default: return -EINVAL; } davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr); dev->pcr = pcr; davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, pcr); return 0; } static int davinci_i2s_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct davinci_pcm_dma_params *dma_params = dai->dma_data; struct davinci_mcbsp_dev *dev = dai->private_data; struct snd_interval *i = NULL; int mcbsp_word_length; unsigned int rcr, xcr, srgr; u32 spcr; /* general line settings */ spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG); if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { spcr |= DAVINCI_MCBSP_SPCR_RINTM(3) | DAVINCI_MCBSP_SPCR_FREE; davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr); } else { spcr |= DAVINCI_MCBSP_SPCR_XINTM(3) | DAVINCI_MCBSP_SPCR_FREE; davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr); } i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); srgr = DAVINCI_MCBSP_SRGR_FSGM; srgr |= DAVINCI_MCBSP_SRGR_FWID(snd_interval_value(i) - 1); i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_FRAME_BITS); srgr |= DAVINCI_MCBSP_SRGR_FPER(snd_interval_value(i) - 1); davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr); rcr = DAVINCI_MCBSP_RCR_RFIG; xcr = DAVINCI_MCBSP_XCR_XFIG; if (dev->mode == MOD_DSP_B) { rcr |= DAVINCI_MCBSP_RCR_RDATDLY(0); xcr |= DAVINCI_MCBSP_XCR_XDATDLY(0); } else { rcr |= DAVINCI_MCBSP_RCR_RDATDLY(1); xcr |= DAVINCI_MCBSP_XCR_XDATDLY(1); } /* Determine xfer data type */ switch (params_format(params)) { case SNDRV_PCM_FORMAT_S8: dma_params->data_type = 1; mcbsp_word_length = DAVINCI_MCBSP_WORD_8; break; case SNDRV_PCM_FORMAT_S16_LE: dma_params->data_type = 2; mcbsp_word_length = DAVINCI_MCBSP_WORD_16; break; case SNDRV_PCM_FORMAT_S32_LE: dma_params->data_type = 4; mcbsp_word_length = DAVINCI_MCBSP_WORD_32; break; default: printk(KERN_WARNING "davinci-i2s: unsupported PCM format\n"); return -EINVAL; } rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(1); xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(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 = { .startup = davinci_i2s_startup, .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; } 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] = &davinci_i2s_pcm_out; 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] = &davinci_i2s_pcm_in; 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; 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");