/* * eti_b1_wm8731 -- SoC audio for AT91RM9200-based Endrelia ETI_B1 board. * * Author: Frank Mandarino * Endrelia Technologies Inc. * Created: Mar 29, 2006 * * Based on corgi.c by: * * Copyright 2005 Wolfson Microelectronics PLC. * Copyright 2005 Openedhand Ltd. * * Authors: Liam Girdwood * Richard Purdie * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "../codecs/wm8731.h" #include "at91-pcm.h" #include "at91-ssc.h" #if 0 #define DBG(x...) printk(KERN_INFO "eti_b1_wm8731: " x) #else #define DBG(x...) #endif 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_dai *codec_dai = rtd->dai->codec_dai; struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai; int ret; /* cpu clock is the AT91 master clock sent to the SSC */ ret = snd_soc_dai_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 = snd_soc_dai_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"); return 0; } static void eti_b1_shutdown(struct snd_pcm_substream *substream) { /* Stop PCK1 clock. */ clk_disable(pck1_clk); 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_dai *codec_dai = rtd->dai->codec_dai; struct snd_soc_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 = snd_soc_dai_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 = snd_soc_dai_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 = snd_soc_dai_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 = snd_soc_dai_set_clkdiv(cpu_dai, AT91SSC_TCMR_PERIOD, period); } else { /* set the BCLK divider for ADCLRC */ ret = snd_soc_dai_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 = snd_soc_dai_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 = snd_soc_dai_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, }; static const struct snd_soc_dapm_widget eti_b1_dapm_widgets[] = { SND_SOC_DAPM_MIC("Int Mic", NULL), SND_SOC_DAPM_SPK("Ext Spk", NULL), }; static const struct snd_soc_dapm_route intercon[] = { /* speaker connected to LHPOUT */ {"Ext Spk", NULL, "LHPOUT"}, /* mic is connected to Mic Jack, with WM8731 Mic Bias */ {"MICIN", NULL, "Mic Bias"}, {"Mic Bias", NULL, "Int Mic"}, }; /* * Logic for a wm8731 as connected on a Endrelia ETI-B1 board. */ static int eti_b1_wm8731_init(struct snd_soc_codec *codec) { DBG("eti_b1_wm8731_init() called\n"); /* Add specific widgets */ snd_soc_dapm_new_controls(codec, eti_b1_dapm_widgets, ARRAY_SIZE(eti_b1_dapm_widgets)); /* Set up specific audio path interconnects */ snd_soc_dapm_add_route(codec, intercon, ARRAY_SIZE(intercon)); /* not connected */ snd_soc_dapm_disable_pin(codec, "RLINEIN"); snd_soc_dapm_disable_pin(codec, "LLINEIN"); /* always connected */ snd_soc_dapm_enable_pin(codec, "Int Mic"); snd_soc_dapm_enable_pin(codec, "Ext Spk"); snd_soc_dapm_sync(codec); return 0; } static struct snd_soc_dai_link eti_b1_dai = { .name = "WM8731", .stream_name = "WM8731 PCM", .cpu_dai = &at91_ssc_dai[1], .codec_dai = &wm8731_dai, .init = eti_b1_wm8731_init, .ops = &eti_b1_ops, }; static struct snd_soc_machine snd_soc_machine_eti_b1 = { .name = "ETI_B1_WM8731", .dai_link = &eti_b1_dai, .num_links = 1, }; static struct wm8731_setup_data eti_b1_wm8731_setup = { .i2c_address = 0x1a, }; static struct snd_soc_device eti_b1_snd_devdata = { .machine = &snd_soc_machine_eti_b1, .platform = &at91_soc_platform, .codec_dev = &soc_codec_dev_wm8731, .codec_data = &eti_b1_wm8731_setup, }; static struct platform_device *eti_b1_snd_device; static int __init eti_b1_init(void) { int ret; struct at91_ssc_periph *ssc = eti_b1_dai.cpu_dai->private_data; if (!request_mem_region(AT91RM9200_BASE_SSC1, SZ_16K, "soc-audio")) { DBG("SSC1 memory region is busy\n"); return -EBUSY; } ssc->base = ioremap(AT91RM9200_BASE_SSC1, SZ_16K); if (!ssc->base) { DBG("SSC1 memory ioremap failed\n"); ret = -ENOMEM; goto fail_release_mem; } ssc->pid = AT91RM9200_ID_SSC1; eti_b1_snd_device = platform_device_alloc("soc-audio", -1); if (!eti_b1_snd_device) { DBG("platform device allocation failed\n"); ret = -ENOMEM; goto fail_io_unmap; } platform_set_drvdata(eti_b1_snd_device, &eti_b1_snd_devdata); eti_b1_snd_devdata.dev = &eti_b1_snd_device->dev; ret = platform_device_add(eti_b1_snd_device); if (ret) { DBG("platform device add failed\n"); platform_device_put(eti_b1_snd_device); goto fail_io_unmap; } at91_set_A_periph(AT91_PIN_PB6, 0); /* TF1 */ at91_set_A_periph(AT91_PIN_PB7, 0); /* TK1 */ at91_set_A_periph(AT91_PIN_PB8, 0); /* TD1 */ at91_set_A_periph(AT91_PIN_PB9, 0); /* RD1 */ /* at91_set_A_periph(AT91_PIN_PB10, 0);*/ /* RK1 */ at91_set_A_periph(AT91_PIN_PB11, 0); /* RF1 */ /* * Set PCK1 parent to PLLB and its rate to 12 Mhz. */ pllb_clk = clk_get(NULL, "pllb"); pck1_clk = clk_get(NULL, "pck1"); clk_set_parent(pck1_clk, pllb_clk); clk_set_rate(pck1_clk, 12000000); DBG("MCLK rate %luHz\n", clk_get_rate(pck1_clk)); /* 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: iounmap(ssc->base); fail_release_mem: release_mem_region(AT91RM9200_BASE_SSC1, SZ_16K); return ret; } static void __exit eti_b1_exit(void) { struct at91_ssc_periph *ssc = eti_b1_dai.cpu_dai->private_data; clk_put(pck1_clk); clk_put(pllb_clk); platform_device_unregister(eti_b1_snd_device); iounmap(ssc->base); release_mem_region(AT91RM9200_BASE_SSC1, SZ_16K); } module_init(eti_b1_init); module_exit(eti_b1_exit); /* Module information */ MODULE_AUTHOR("Frank Mandarino "); MODULE_DESCRIPTION("ALSA SoC ETI-B1-WM8731"); MODULE_LICENSE("GPL");