254 lines
6.4 KiB
C
254 lines
6.4 KiB
C
/*
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* Modifications by Christian Pellegrin <chripell@evolware.org>
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*
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* s3c24xx_uda134x.c -- S3C24XX_UDA134X ALSA SoC Audio board driver
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*
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* Copyright 2007 Dension Audio Systems Ltd.
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* Author: Zoltan Devai
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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/clk.h>
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#include <linux/gpio.h>
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#include <linux/module.h>
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#include <sound/soc.h>
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#include <sound/s3c24xx_uda134x.h>
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#include "regs-iis.h"
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#include "s3c24xx-i2s.h"
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/* #define ENFORCE_RATES 1 */
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/*
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Unfortunately the S3C24XX in master mode has a limited capacity of
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generating the clock for the codec. If you define this only rates
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that are really available will be enforced. But be careful, most
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user level application just want the usual sampling frequencies (8,
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11.025, 22.050, 44.1 kHz) and anyway resampling is a costly
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operation for embedded systems. So if you aren't very lucky or your
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hardware engineer wasn't very forward-looking it's better to leave
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this undefined. If you do so an approximate value for the requested
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sampling rate in the range -/+ 5% will be chosen. If this in not
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possible an error will be returned.
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*/
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static struct clk *xtal;
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static struct clk *pclk;
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/* this is need because we don't have a place where to keep the
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* pointers to the clocks in each substream. We get the clocks only
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* when we are actually using them so we don't block stuff like
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* frequency change or oscillator power-off */
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static int clk_users;
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static DEFINE_MUTEX(clk_lock);
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static unsigned int rates[33 * 2];
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#ifdef ENFORCE_RATES
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static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
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.count = ARRAY_SIZE(rates),
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.list = rates,
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.mask = 0,
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};
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#endif
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static int s3c24xx_uda134x_startup(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_dai *cpu_dai = rtd->cpu_dai;
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#ifdef ENFORCE_RATES
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struct snd_pcm_runtime *runtime = substream->runtime;
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#endif
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int ret = 0;
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mutex_lock(&clk_lock);
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if (clk_users == 0) {
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xtal = clk_get(rtd->dev, "xtal");
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if (IS_ERR(xtal)) {
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dev_err(rtd->dev, "%s cannot get xtal\n", __func__);
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ret = PTR_ERR(xtal);
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} else {
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pclk = clk_get(cpu_dai->dev, "iis");
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if (IS_ERR(pclk)) {
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dev_err(rtd->dev, "%s cannot get pclk\n",
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__func__);
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clk_put(xtal);
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ret = PTR_ERR(pclk);
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}
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}
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if (!ret) {
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int i, j;
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for (i = 0; i < 2; i++) {
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int fs = i ? 256 : 384;
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rates[i*33] = clk_get_rate(xtal) / fs;
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for (j = 1; j < 33; j++)
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rates[i*33 + j] = clk_get_rate(pclk) /
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(j * fs);
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}
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}
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}
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clk_users += 1;
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mutex_unlock(&clk_lock);
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if (!ret) {
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#ifdef ENFORCE_RATES
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ret = snd_pcm_hw_constraint_list(runtime, 0,
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SNDRV_PCM_HW_PARAM_RATE,
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&hw_constraints_rates);
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if (ret < 0)
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dev_err(rtd->dev, "%s cannot set constraints\n",
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__func__);
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#endif
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}
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return ret;
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}
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static void s3c24xx_uda134x_shutdown(struct snd_pcm_substream *substream)
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{
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mutex_lock(&clk_lock);
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clk_users -= 1;
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if (clk_users == 0) {
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clk_put(xtal);
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xtal = NULL;
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clk_put(pclk);
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pclk = NULL;
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}
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mutex_unlock(&clk_lock);
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}
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static int s3c24xx_uda134x_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_dai *codec_dai = rtd->codec_dai;
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struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
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unsigned int clk = 0;
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int ret = 0;
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int clk_source, fs_mode;
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unsigned long rate = params_rate(params);
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long err, cerr;
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unsigned int div;
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int i, bi;
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err = 999999;
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bi = 0;
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for (i = 0; i < 2*33; i++) {
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cerr = rates[i] - rate;
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if (cerr < 0)
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cerr = -cerr;
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if (cerr < err) {
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err = cerr;
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bi = i;
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}
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}
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if (bi / 33 == 1)
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fs_mode = S3C2410_IISMOD_256FS;
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else
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fs_mode = S3C2410_IISMOD_384FS;
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if (bi % 33 == 0) {
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clk_source = S3C24XX_CLKSRC_MPLL;
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div = 1;
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} else {
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clk_source = S3C24XX_CLKSRC_PCLK;
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div = bi % 33;
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}
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dev_dbg(rtd->dev, "%s desired rate %lu, %d\n", __func__, rate, bi);
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clk = (fs_mode == S3C2410_IISMOD_384FS ? 384 : 256) * rate;
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dev_dbg(rtd->dev, "%s will use: %s %s %d sysclk %d err %ld\n", __func__,
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fs_mode == S3C2410_IISMOD_384FS ? "384FS" : "256FS",
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clk_source == S3C24XX_CLKSRC_MPLL ? "MPLLin" : "PCLK",
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div, clk, err);
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if ((err * 100 / rate) > 5) {
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dev_err(rtd->dev, "effective frequency too different "
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"from desired (%ld%%)\n", err * 100 / rate);
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return -EINVAL;
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}
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ret = snd_soc_dai_set_sysclk(cpu_dai, clk_source , clk,
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SND_SOC_CLOCK_IN);
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if (ret < 0)
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return ret;
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ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK, fs_mode);
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if (ret < 0)
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return ret;
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ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_BCLK,
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S3C2410_IISMOD_32FS);
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if (ret < 0)
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return ret;
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ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
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S3C24XX_PRESCALE(div, div));
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if (ret < 0)
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return ret;
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/* set the codec system clock for DAC and ADC */
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ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk,
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SND_SOC_CLOCK_OUT);
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if (ret < 0)
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return ret;
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return 0;
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}
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static struct snd_soc_ops s3c24xx_uda134x_ops = {
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.startup = s3c24xx_uda134x_startup,
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.shutdown = s3c24xx_uda134x_shutdown,
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.hw_params = s3c24xx_uda134x_hw_params,
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};
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static struct snd_soc_dai_link s3c24xx_uda134x_dai_link = {
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.name = "UDA134X",
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.stream_name = "UDA134X",
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.codec_name = "uda134x-codec",
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.codec_dai_name = "uda134x-hifi",
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.cpu_dai_name = "s3c24xx-iis",
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.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
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SND_SOC_DAIFMT_CBS_CFS,
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.ops = &s3c24xx_uda134x_ops,
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.platform_name = "s3c24xx-iis",
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};
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static struct snd_soc_card snd_soc_s3c24xx_uda134x = {
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.name = "S3C24XX_UDA134X",
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.owner = THIS_MODULE,
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.dai_link = &s3c24xx_uda134x_dai_link,
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.num_links = 1,
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};
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static int s3c24xx_uda134x_probe(struct platform_device *pdev)
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{
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struct snd_soc_card *card = &snd_soc_s3c24xx_uda134x;
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int ret;
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platform_set_drvdata(pdev, card);
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card->dev = &pdev->dev;
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ret = devm_snd_soc_register_card(&pdev->dev, card);
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if (ret)
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dev_err(&pdev->dev, "failed to register card: %d\n", ret);
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return ret;
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}
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static struct platform_driver s3c24xx_uda134x_driver = {
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.probe = s3c24xx_uda134x_probe,
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.driver = {
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.name = "s3c24xx_uda134x",
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},
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};
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module_platform_driver(s3c24xx_uda134x_driver);
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MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>");
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MODULE_DESCRIPTION("S3C24XX_UDA134X ALSA SoC audio driver");
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MODULE_LICENSE("GPL");
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