diff options
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/at91/eti_b1_wm8731.c | 141 |
1 files changed, 124 insertions, 17 deletions
diff --git a/sound/soc/at91/eti_b1_wm8731.c b/sound/soc/at91/eti_b1_wm8731.c index 089cdc9..8179df3 100644 --- a/sound/soc/at91/eti_b1_wm8731.c +++ b/sound/soc/at91/eti_b1_wm8731.c @@ -18,9 +18,6 @@ * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * - * Revision history - * 30th Nov 2005 Initial version. - * */ #include <linux/module.h> @@ -43,9 +40,10 @@ #include "../codecs/wm8731.h" #include "at91-pcm.h" +#include "at91-i2s.h" #if 0 -#define DBG(x...) printk(KERN_INFO "eti_b1_wm8731:" x) +#define DBG(x...) printk(KERN_INFO "eti_b1_wm8731: " x) #else #define DBG(x...) #endif @@ -57,12 +55,29 @@ #define AT91_PIO_RK1 (1 << (AT91_PIN_PB10 - PIN_BASE) % 32) #define AT91_PIO_RF1 (1 << (AT91_PIN_PB11 - PIN_BASE) % 32) - static struct clk *pck1_clk; static struct clk *pllb_clk; + static int eti_b1_startup(struct snd_pcm_substream *substream) { + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai; + struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai; + int ret; + + /* cpu clock is the AT91 master clock sent to the SSC */ + ret = cpu_dai->dai_ops.set_sysclk(cpu_dai, AT91_SYSCLK_MCK, + 60000000, SND_SOC_CLOCK_IN); + if (ret < 0) + return ret; + + /* codec system clock is supplied by PCK1, set to 12MHz */ + ret = codec_dai->dai_ops.set_sysclk(codec_dai, WM8731_SYSCLK, + 12000000, SND_SOC_CLOCK_IN); + if (ret < 0) + return ret; + /* Start PCK1 clock. */ clk_enable(pck1_clk); DBG("pck1 started\n"); @@ -77,8 +92,105 @@ static void eti_b1_shutdown(struct snd_pcm_substream *substream) DBG("pck1 stopped\n"); } +static int eti_b1_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai; + struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai; + int ret; + +#ifdef CONFIG_SND_AT91_SOC_ETI_SLAVE + unsigned int rate; + int cmr_div, period; + + /* set codec DAI configuration */ + ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S | + SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS); + if (ret < 0) + return ret; + + /* set cpu DAI configuration */ + ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S | + SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS); + if (ret < 0) + return ret; + + /* + * The SSC clock dividers depend on the sample rate. The CMR.DIV + * field divides the system master clock MCK to drive the SSC TK + * signal which provides the codec BCLK. The TCMR.PERIOD and + * RCMR.PERIOD fields further divide the BCLK signal to drive + * the SSC TF and RF signals which provide the codec DACLRC and + * ADCLRC clocks. + * + * The dividers were determined through trial and error, where a + * CMR.DIV value is chosen such that the resulting BCLK value is + * divisible, or almost divisible, by (2 * sample rate), and then + * the TCMR.PERIOD or RCMR.PERIOD is BCLK / (2 * sample rate) - 1. + */ + rate = params_rate(params); + + switch (rate) { + case 8000: + cmr_div = 25; /* BCLK = 60MHz/(2*25) = 1.2MHz */ + period = 74; /* LRC = BCLK/(2*(74+1)) = 8000Hz */ + break; + case 32000: + cmr_div = 7; /* BCLK = 60MHz/(2*7) ~= 4.28571428MHz */ + period = 66; /* LRC = BCLK/(2*(66+1)) = 31982.942Hz */ + break; + case 48000: + cmr_div = 13; /* BCLK = 60MHz/(2*13) ~= 2.3076923MHz */ + period = 23; /* LRC = BCLK/(2*(23+1)) = 48076.923Hz */ + break; + default: + printk(KERN_WARNING "unsupported rate %d on ETI-B1 board\n", rate); + return -EINVAL; + } + + /* set the MCK divider for BCLK */ + ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, AT91SSC_CMR_DIV, cmr_div); + if (ret < 0) + return ret; + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + /* set the BCLK divider for DACLRC */ + ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, + AT91SSC_TCMR_PERIOD, period); + } else { + /* set the BCLK divider for ADCLRC */ + ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, + AT91SSC_RCMR_PERIOD, period); + } + if (ret < 0) + return ret; + +#else /* CONFIG_SND_AT91_SOC_ETI_SLAVE */ + /* + * Codec in Master Mode. + */ + + /* set codec DAI configuration */ + ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S | + SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM); + if (ret < 0) + return ret; + + /* set cpu DAI configuration */ + ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S | + SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM); + if (ret < 0) + return ret; + +#endif /* CONFIG_SND_AT91_SOC_ETI_SLAVE */ + + return 0; +} + static struct snd_soc_ops eti_b1_ops = { .startup = eti_b1_startup, + .hw_params = eti_b1_hw_params, .shutdown = eti_b1_shutdown, }; @@ -134,29 +246,19 @@ static int eti_b1_wm8731_init(struct snd_soc_codec *codec) return 0; } -unsigned int eti_b1_config_sysclk(struct snd_soc_pcm_runtime *rtd, - struct snd_soc_clock_info *info) -{ - if(info->bclk_master & SND_SOC_DAIFMT_CBS_CFS) { - return rtd->codec_dai->config_sysclk(rtd->codec_dai, info, 12000000); - } - return 0; -} - static struct snd_soc_dai_link eti_b1_dai = { .name = "WM8731", .stream_name = "WM8731", .cpu_dai = &at91_i2s_dai[1], .codec_dai = &wm8731_dai, .init = eti_b1_wm8731_init, - .config_sysclk = eti_b1_config_sysclk, + .ops = &eti_b1_ops, }; static struct snd_soc_machine snd_soc_machine_eti_b1 = { .name = "ETI_B1", .dai_link = &eti_b1_dai, .num_links = 1, - .ops = &eti_b1_ops, }; static struct wm8731_setup_data eti_b1_wm8731_setup = { @@ -210,7 +312,7 @@ static int __init eti_b1_init(void) } ssc_pio_lines = AT91_PIO_TF1 | AT91_PIO_TK1 | AT91_PIO_TD1 - | AT91_PIO_RD1 /* | AT91_PIO_RK1 | AT91_PIO_RF1 */; + | AT91_PIO_RD1 /* | AT91_PIO_RK1 */ | AT91_PIO_RF1; /* Reset all PIO registers and assign lines to peripheral A */ at91_sys_write(AT91_PIOB + PIO_PDR, ssc_pio_lines); @@ -237,6 +339,11 @@ static int __init eti_b1_init(void) /* assign the GPIO pin to PCK1 */ at91_set_B_periph(AT91_PIN_PA24, 0); +#ifdef CONFIG_SND_AT91_SOC_ETI_SLAVE + printk(KERN_INFO "eti_b1_wm8731: Codec in Slave Mode\n"); +#else + printk(KERN_INFO "eti_b1_wm8731: Codec in Master Mode\n"); +#endif return ret; fail_io_unmap: |
