mirror of https://gitee.com/openkylin/linux.git
ASoC: DaVinci: Added two clocking possibilities to McBSP (I2S)
Added two clocking options for dm365 McBSP peripheral when used with I2S timings, that are SND_SOC_DAIFMT_CBS_CFS (the cpu generates clock and frame sync) and SND_SOC_DAIFMT_CBS_CFM (the cpu gets clock from external pin and generates frame sync). A slave clock management can be important when the external codec needs the system clock and the bit clock synchronized (tested with uda1345). This patch has been developed against the: http://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-davinci.git git tree and has been tested on bmx board (similar to dm365 evm, but using uda1345 as external audio codec). Signed-off-by: Raffaele Recalcati <raffaele.recalcati@bticino.it> Signed-off-by: Davide Bonfanti <davide.bonfanti@bticino.it> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Acked-by: Sudhakar Rajashekhara <sudhakar.raj@ti.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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@ -26,6 +26,7 @@
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#include <mach/asp.h>
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#include "davinci-pcm.h"
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#include "davinci-i2s.h"
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/*
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@ -68,16 +69,21 @@
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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_RCR_RFRLEN2(v) ((v) << 24)
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#define DAVINCI_MCBSP_RCR_RPHASE BIT(31)
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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_XCR_XFRLEN2(v) ((v) << 24)
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#define DAVINCI_MCBSP_XCR_XPHASE BIT(31)
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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_SRGR_CLKSM BIT(29)
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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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@ -144,6 +150,9 @@ struct davinci_mcbsp_dev {
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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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unsigned int fmt;
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int clk_div;
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};
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static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
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@ -254,10 +263,12 @@ static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
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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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/* Attention srgr is updated by hw_params! */
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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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dev->fmt = fmt;
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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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@ -372,6 +383,18 @@ static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
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return 0;
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}
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static int davinci_i2s_dai_set_clkdiv(struct snd_soc_dai *cpu_dai,
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int div_id, int div)
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{
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struct davinci_mcbsp_dev *dev = cpu_dai->private_data;
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if (div_id != DAVINCI_MCBSP_CLKGDV)
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return -ENODEV;
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dev->clk_div = div;
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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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@ -380,8 +403,8 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
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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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int mcbsp_word_length, master;
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unsigned int rcr, xcr, srgr, clk_div, freq, framesize;
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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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@ -396,12 +419,47 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
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}
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master = dev->fmt & SND_SOC_DAIFMT_MASTER_MASK;
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fmt = params_format(params);
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mcbsp_word_length = asp_word_length[fmt];
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switch (master) {
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case SND_SOC_DAIFMT_CBS_CFS:
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freq = clk_get_rate(dev->clk);
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srgr = DAVINCI_MCBSP_SRGR_FSGM |
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DAVINCI_MCBSP_SRGR_CLKSM;
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srgr |= DAVINCI_MCBSP_SRGR_FWID(mcbsp_word_length *
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8 - 1);
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/* symmetric waveforms */
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clk_div = freq / (mcbsp_word_length * 16) /
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params->rate_num * params->rate_den;
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srgr |= DAVINCI_MCBSP_SRGR_FPER(mcbsp_word_length *
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16 - 1);
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clk_div &= 0xFF;
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srgr |= clk_div;
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break;
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case SND_SOC_DAIFMT_CBM_CFS:
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srgr = DAVINCI_MCBSP_SRGR_FSGM;
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clk_div = dev->clk_div - 1;
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srgr |= DAVINCI_MCBSP_SRGR_FWID(mcbsp_word_length * 8 - 1);
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srgr |= DAVINCI_MCBSP_SRGR_FPER(mcbsp_word_length * 16 - 1);
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clk_div &= 0xFF;
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srgr |= clk_div;
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break;
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case SND_SOC_DAIFMT_CBM_CFM:
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/* Clock and frame sync given from external sources */
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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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pr_debug("%s - %d FWID set: re-read srgr = %X\n",
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__func__, __LINE__, 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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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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rcr = DAVINCI_MCBSP_RCR_RFIG;
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@ -426,12 +484,41 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
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element_cnt = 1;
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fmt = double_fmt[fmt];
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}
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switch (master) {
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case SND_SOC_DAIFMT_CBS_CFS:
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case SND_SOC_DAIFMT_CBS_CFM:
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rcr |= DAVINCI_MCBSP_RCR_RFRLEN2(0);
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xcr |= DAVINCI_MCBSP_XCR_XFRLEN2(0);
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rcr |= DAVINCI_MCBSP_RCR_RPHASE;
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xcr |= DAVINCI_MCBSP_XCR_XPHASE;
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break;
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case SND_SOC_DAIFMT_CBM_CFM:
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case SND_SOC_DAIFMT_CBM_CFS:
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rcr |= DAVINCI_MCBSP_RCR_RFRLEN2(element_cnt - 1);
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xcr |= DAVINCI_MCBSP_XCR_XFRLEN2(element_cnt - 1);
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break;
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default:
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return -EINVAL;
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}
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}
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dma_params->acnt = dma_params->data_type = data_type[fmt];
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dma_params->fifo_level = 0;
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mcbsp_word_length = asp_word_length[fmt];
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switch (master) {
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case SND_SOC_DAIFMT_CBS_CFS:
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case SND_SOC_DAIFMT_CBS_CFM:
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rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(0);
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xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(0);
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break;
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case SND_SOC_DAIFMT_CBM_CFM:
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case SND_SOC_DAIFMT_CBM_CFS:
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rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(element_cnt - 1);
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xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(element_cnt - 1);
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break;
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default:
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return -EINVAL;
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}
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rcr |= DAVINCI_MCBSP_RCR_RWDLEN1(mcbsp_word_length) |
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DAVINCI_MCBSP_RCR_RWDLEN2(mcbsp_word_length);
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@ -442,6 +529,10 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG, xcr);
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else
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG, rcr);
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pr_debug("%s - %d srgr=%X\n", __func__, __LINE__, srgr);
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pr_debug("%s - %d xcr=%X\n", __func__, __LINE__, xcr);
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pr_debug("%s - %d rcr=%X\n", __func__, __LINE__, rcr);
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return 0;
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}
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@ -500,6 +591,7 @@ static struct snd_soc_dai_ops davinci_i2s_dai_ops = {
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.trigger = davinci_i2s_trigger,
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.hw_params = davinci_i2s_hw_params,
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.set_fmt = davinci_i2s_set_dai_fmt,
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.set_clkdiv = davinci_i2s_dai_set_clkdiv,
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};
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@ -12,6 +12,11 @@
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#ifndef _DAVINCI_I2S_H
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#define _DAVINCI_I2S_H
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/* McBSP dividers */
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enum davinci_mcbsp_div {
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DAVINCI_MCBSP_CLKGDV, /* Sample rate generator divider */
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};
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extern struct snd_soc_dai davinci_i2s_dai;
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#endif
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