ASoC: Machine driver for for s3c24xx with uda134x

Signed-off-by: Christian Pellegrin <chripell@fsfe.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 374 insertions, 0 deletions

diff --git a/sound/soc/s3c24xx/s3c24xx_uda134x.c b/sound/soc/s3c24xx/s3c24xx_uda134x.c
new file mode 100644
index 000000000000..29a68132f169
--- /dev/null
+++ b/sound/soc/s3c24xx/s3c24xx_uda134x.c
@@ -0,0 +1,374 @@
+/*
+ * Modifications by Christian Pellegrin <chripell@evolware.org>
+ *
+ * s3c24xx_uda134x.c  --  S3C24XX_UDA134X ALSA SoC Audio board driver
+ *
+ * Copyright 2007 Dension Audio Systems Ltd.
+ * Author: Zoltan Devai
+ *
+ * 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 <linux/module.h>
+#include <linux/clk.h>
+#include <linux/mutex.h>
+#include <linux/gpio.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <sound/s3c24xx_uda134x.h>
+#include <sound/uda134x.h>
+
+#include <asm/plat-s3c24xx/regs-iis.h>
+
+#include "s3c24xx-pcm.h"
+#include "s3c24xx-i2s.h"
+#include "../codecs/uda134x_codec.h"
+
+
+/* #define ENFORCE_RATES 1 */
+/*
+  Unfortunately the S3C24XX in master mode has a limited capacity of
+  generating the clock for the codec. If you define this only rates
+  that are really available will be enforced. But be careful, most
+  user level application just want the usual sampling frequencies (8,
+  11.025, 22.050, 44.1 kHz) and anyway resampling is a costly
+  operation for embedded systems. So if you aren't very lucky or your
+  hardware engineer wasn't very forward-looking it's better to leave
+  this undefined. If you do so an approximate value for the requested
+  sampling rate in the range -/+ 5% will be chosen. If this in not
+  possible an error will be returned.
+*/
+
+static struct clk *xtal;
+static struct clk *pclk;
+/* this is need because we don't have a place where to keep the
+ * pointers to the clocks in each substream. We get the clocks only
+ * when we are actually using them so we don't block stuff like
+ * frequency change or oscillator power-off */
+static int clk_users;
+static DEFINE_MUTEX(clk_lock);
+
+static unsigned int rates[33 * 2];
+#ifdef ENFORCE_RATES
+static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
+        .count  = ARRAY_SIZE(rates),
+        .list   = rates,
+        .mask   = 0,
+};
+#endif
+
+static struct platform_device *s3c24xx_uda134x_snd_device;
+
+int s3c24xx_uda134x_startup(struct snd_pcm_substream *substream)
+{
+        int ret = 0;
+#ifdef ENFORCE_RATES
+        struct snd_pcm_runtime *runtime = substream->runtime;;
+#endif
+
+        mutex_lock(&clk_lock);
+        pr_debug("%s %d\n", __func__, clk_users);
+        if (clk_users == 0) {
+                xtal = clk_get(&s3c24xx_uda134x_snd_device->dev, "xtal");
+                if (!xtal) {
+                        printk(KERN_ERR "%s cannot get xtal\n", __func__);
+                        ret = -EBUSY;
+                } else {
+                        pclk = clk_get(&s3c24xx_uda134x_snd_device->dev,
+                                       "pclk");
+                        if (!pclk) {
+                                printk(KERN_ERR "%s cannot get pclk\n",
+                                       __func__);
+                                clk_put(xtal);
+                                ret = -EBUSY;
+                        }
+                }
+                if (!ret) {
+                        int i, j;
+
+                        for (i = 0; i < 2; i++) {
+                                int fs = i ? 256 : 384;
+
+                                rates[i*33] = clk_get_rate(xtal) / fs;
+                                for (j = 1; j < 33; j++)
+                                        rates[i*33 + j] = clk_get_rate(pclk) /
+                                                (j * fs);
+                        }
+                }
+        }
+        clk_users += 1;
+        mutex_unlock(&clk_lock);
+        if (!ret) {
+#ifdef ENFORCE_RATES
+                ret = snd_pcm_hw_constraint_list(runtime, 0,
+                                                 SNDRV_PCM_HW_PARAM_RATE,
+                                                 &hw_constraints_rates);
+                if (ret < 0)
+                        printk(KERN_ERR "%s cannot set constraints\n",
+                               __func__);
+#endif
+        }
+        return ret;
+}
+
+void s3c24xx_uda134x_shutdown(struct snd_pcm_substream *substream)
+{
+        mutex_lock(&clk_lock);
+        pr_debug("%s %d\n", __func__, clk_users);
+        clk_users -= 1;
+        if (clk_users == 0) {
+                clk_put(xtal);
+                xtal = NULL;
+                clk_put(pclk);
+                pclk = NULL;
+        }
+        mutex_unlock(&clk_lock);
+}
+
+static int s3c24xx_uda134x_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;
+        unsigned int clk = 0;
+        int ret = 0;
+        int clk_source, fs_mode;
+        unsigned long rate = params_rate(params);
+        long err, cerr;
+        unsigned int div;
+        int i, bi;
+
+        err = 999999;
+        bi = 0;
+        for (i = 0; i < 2*33; i++) {
+                cerr = rates[i] - rate;
+                if (cerr < 0)
+                        cerr = -cerr;
+                if (cerr < err) {
+                        err = cerr;
+                        bi = i;
+                }
+        }
+        if (bi / 33 == 1)
+                fs_mode = S3C2410_IISMOD_256FS;
+        else
+                fs_mode = S3C2410_IISMOD_384FS;
+        if (bi % 33 == 0) {
+                clk_source = S3C24XX_CLKSRC_MPLL;
+                div = 1;
+        } else {
+                clk_source = S3C24XX_CLKSRC_PCLK;
+                div = bi % 33;
+        }
+        pr_debug("%s desired rate %lu, %d\n", __func__, rate, bi);
+
+        clk = (fs_mode == S3C2410_IISMOD_384FS ? 384 : 256) * rate;
+        pr_debug("%s will use: %s %s %d sysclk %d err %ld\n", __func__,
+                 fs_mode == S3C2410_IISMOD_384FS ? "384FS" : "256FS",
+                 clk_source == S3C24XX_CLKSRC_MPLL ? "MPLLin" : "PCLK",
+                 div, clk, err);
+
+        if ((err * 100 / rate) > 5) {
+                printk(KERN_ERR "S3C24XX_UDA134X: effective frequency "
+                       "too different from desired (%ld%%)\n",
+                       err * 100 / rate);
+                return -EINVAL;
+        }
+
+        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;
+
+        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;
+
+        ret = cpu_dai->dai_ops.set_sysclk(cpu_dai, clk_source , clk,
+                                                SND_SOC_CLOCK_IN);
+        if (ret < 0)
+                return ret;
+
+        ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK,
+                                                fs_mode);
+        if (ret < 0)
+                return ret;
+
+        ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_BCLK,
+                                                S3C2410_IISMOD_32FS);
+        if (ret < 0)
+                return ret;
+
+        ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
+                                          S3C24XX_PRESCALE(div, div));
+        if (ret < 0)
+                return ret;
+
+        /* set the codec system clock for DAC and ADC */
+        ret = codec_dai->dai_ops.set_sysclk(codec_dai, 0, clk,
+                                                SND_SOC_CLOCK_OUT);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+
+static struct snd_soc_ops s3c24xx_uda134x_ops = {
+        .startup = s3c24xx_uda134x_startup,
+        .shutdown = s3c24xx_uda134x_shutdown,
+        .hw_params = s3c24xx_uda134x_hw_params,
+};
+
+static struct snd_soc_dai_link s3c24xx_uda134x_dai_link = {
+        .name = "UDA134X",
+        .stream_name = "UDA134X",
+        .codec_dai = &uda134x_dai,
+        .cpu_dai = &s3c24xx_i2s_dai,
+        .ops = &s3c24xx_uda134x_ops,
+};
+
+static struct snd_soc_machine snd_soc_machine_s3c24xx_uda134x = {
+        .name = "S3C24XX_UDA134X",
+        .dai_link = &s3c24xx_uda134x_dai_link,
+        .num_links = 1,
+};
+
+static struct s3c24xx_uda134x_platform_data *s3c24xx_uda134x_l3_pins;
+
+static void setdat(int v)
+{
+        gpio_set_value(s3c24xx_uda134x_l3_pins->l3_data, v > 0);
+}
+
+static void setclk(int v)
+{
+        gpio_set_value(s3c24xx_uda134x_l3_pins->l3_clk, v > 0);
+}
+
+static void setmode(int v)
+{
+        gpio_set_value(s3c24xx_uda134x_l3_pins->l3_mode, v > 0);
+}
+
+static struct uda134x_platform_data s3c24xx_uda134x = {
+        .l3 = {
+                .setdat = setdat,
+                .setclk = setclk,
+                .setmode = setmode,
+                .data_hold = 1,
+                .data_setup = 1,
+                .clock_high = 1,
+                .mode_hold = 1,
+                .mode = 1,
+                .mode_setup = 1,
+        },
+};
+
+static struct snd_soc_device s3c24xx_uda134x_snd_devdata = {
+        .machine = &snd_soc_machine_s3c24xx_uda134x,
+        .platform = &s3c24xx_soc_platform,
+        .codec_dev = &soc_codec_dev_uda134x,
+        .codec_data = &s3c24xx_uda134x,
+};
+
+static int s3c24xx_uda134x_setup_pin(int pin, char *fun)
+{
+        if (gpio_request(pin, "s3c24xx_uda134x") < 0) {
+                printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
+                       "l3 %s pin already in use", fun);
+                return -EBUSY;
+        }
+        gpio_direction_output(pin, 0);
+        return 0;
+}
+
+static int s3c24xx_uda134x_probe(struct platform_device *pdev)
+{
+        int ret;
+
+        printk(KERN_INFO "S3C24XX_UDA134X SoC Audio driver\n");
+
+        s3c24xx_uda134x_l3_pins = pdev->dev.platform_data;
+        if (s3c24xx_uda134x_l3_pins == NULL) {
+                printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
+                       "unable to find platform data\n");
+                return -ENODEV;
+        }
+        s3c24xx_uda134x.power = s3c24xx_uda134x_l3_pins->power;
+        s3c24xx_uda134x.model = s3c24xx_uda134x_l3_pins->model;
+
+        if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_data,
+                                      "data") < 0)
+                return -EBUSY;
+        if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_clk,
+                                      "clk") < 0) {
+                gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
+                return -EBUSY;
+        }
+        if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_mode,
+                                      "mode") < 0) {
+                gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
+                gpio_free(s3c24xx_uda134x_l3_pins->l3_clk);
+                return -EBUSY;
+        }
+
+        s3c24xx_uda134x_snd_device = platform_device_alloc("soc-audio", -1);
+        if (!s3c24xx_uda134x_snd_device) {
+                printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
+                       "Unable to register\n");
+                return -ENOMEM;
+        }
+
+        platform_set_drvdata(s3c24xx_uda134x_snd_device,
+                             &s3c24xx_uda134x_snd_devdata);
+        s3c24xx_uda134x_snd_devdata.dev = &s3c24xx_uda134x_snd_device->dev;
+        ret = platform_device_add(s3c24xx_uda134x_snd_device);
+        if (ret) {
+                printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: Unable to add\n");
+                platform_device_put(s3c24xx_uda134x_snd_device);
+        }
+
+        return ret;
+}
+
+static int s3c24xx_uda134x_remove(struct platform_device *pdev)
+{
+        platform_device_unregister(s3c24xx_uda134x_snd_device);
+        gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
+        gpio_free(s3c24xx_uda134x_l3_pins->l3_clk);
+        gpio_free(s3c24xx_uda134x_l3_pins->l3_mode);
+        return 0;
+}
+
+static struct platform_driver s3c24xx_uda134x_driver = {
+        .probe  = s3c24xx_uda134x_probe,
+        .remove = s3c24xx_uda134x_remove,
+        .driver = {
+                .name = "s3c24xx_uda134x",
+                .owner = THIS_MODULE,
+        },
+};
+
+static int __init s3c24xx_uda134x_init(void)
+{
+        return platform_driver_register(&s3c24xx_uda134x_driver);
+}
+
+static void __exit s3c24xx_uda134x_exit(void)
+{
+        platform_driver_unregister(&s3c24xx_uda134x_driver);
+}
+
+
+module_init(s3c24xx_uda134x_init);
+module_exit(s3c24xx_uda134x_exit);
+
+MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>");
+MODULE_DESCRIPTION("S3C24XX_UDA134X ALSA SoC audio driver");
+MODULE_LICENSE("GPL");