ASoC: Merge AT91 and AVR32 support into a single atmel architecture

The Ateml AT91 and AVR32 SoC share common IP for audio and can share the
same driver code using the atmel-ssc API provided for both architectures.
Do this, creating a new unified atmel ASoC architecture to replace the
previous at32 and at91 ones.

[This was contributed as a patch series for reviewability but has been
squashed down to a single commit to help preserve both the history and
bisectability.  A small bugfix from Jukka is included.]

Tested-by: Jukka Hynninen <ext-jukka.hynninen@vaisala.com>
Signed-off-by: Sedji Gaouaou <sedji.gaouaou@atmel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 513 insertions, 0 deletions

diff --git a/sound/soc/atmel/playpaq_wm8510.c b/sound/soc/atmel/playpaq_wm8510.c
new file mode 100644
index 00000000000..5b07cf7ea4e
--- /dev/null
+++ b/sound/soc/atmel/playpaq_wm8510.c
@@ -0,0 +1,513 @@
+/* sound/soc/at32/playpaq_wm8510.c
+ * ASoC machine driver for PlayPaq using WM8510 codec
+ *
+ * Copyright (C) 2008 Long Range Systems
+ *    Geoffrey Wossum <gwossum@acm.org>
+ *
+ * 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.
+ *
+ * This code is largely inspired by sound/soc/at91/eti_b1_wm8731.c
+ *
+ * NOTE: If you don't have the AT32 enhanced portmux configured (which
+ * isn't currently in the mainline or Atmel patched kernel), you will
+ * need to set the MCLK pin (PA30) to peripheral A in your board initialization
+ * code.  Something like:
+ *	at32_select_periph(GPIO_PIN_PA(30), GPIO_PERIPH_A, 0);
+ *
+ */
+
+/* #define DEBUG */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/clk.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#include <mach/at32ap700x.h>
+#include <mach/portmux.h>
+
+#include "../codecs/wm8510.h"
+#include "atmel-pcm.h"
+#include "atmel_ssc_dai.h"
+
+
+/*-------------------------------------------------------------------------*\
+ * constants
+\*-------------------------------------------------------------------------*/
+#define MCLK_PIN		GPIO_PIN_PA(30)
+#define MCLK_PERIPH		GPIO_PERIPH_A
+
+
+/*-------------------------------------------------------------------------*\
+ * data types
+\*-------------------------------------------------------------------------*/
+/* SSC clocking data */
+struct ssc_clock_data {
+	/* CMR div */
+	unsigned int cmr_div;
+
+	/* Frame period (as needed by xCMR.PERIOD) */
+	unsigned int period;
+
+	/* The SSC clock rate these settings where calculated for */
+	unsigned long ssc_rate;
+};
+
+
+/*-------------------------------------------------------------------------*\
+ * module data
+\*-------------------------------------------------------------------------*/
+static struct clk *_gclk0;
+static struct clk *_pll0;
+
+#define CODEC_CLK (_gclk0)
+
+
+/*-------------------------------------------------------------------------*\
+ * Sound SOC operations
+\*-------------------------------------------------------------------------*/
+#if defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE
+static struct ssc_clock_data playpaq_wm8510_calc_ssc_clock(
+	struct snd_pcm_hw_params *params,
+	struct snd_soc_dai *cpu_dai)
+{
+	struct at32_ssc_info *ssc_p = cpu_dai->private_data;
+	struct ssc_device *ssc = ssc_p->ssc;
+	struct ssc_clock_data cd;
+	unsigned int rate, width_bits, channels;
+	unsigned int bitrate, ssc_div;
+	unsigned actual_rate;
+
+
+	/*
+	 * Figure out required bitrate
+	 */
+	rate = params_rate(params);
+	channels = params_channels(params);
+	width_bits = snd_pcm_format_physical_width(params_format(params));
+	bitrate = rate * width_bits * channels;
+
+
+	/*
+	 * Figure out required SSC divider and period for required bitrate
+	 */
+	cd.ssc_rate = clk_get_rate(ssc->clk);
+	ssc_div = cd.ssc_rate / bitrate;
+	cd.cmr_div = ssc_div / 2;
+	if (ssc_div & 1) {
+		/* round cmr_div up */
+		cd.cmr_div++;
+	}
+	cd.period = width_bits - 1;
+
+
+	/*
+	 * Find actual rate, compare to requested rate
+	 */
+	actual_rate = (cd.ssc_rate / (cd.cmr_div * 2)) / (2 * (cd.period + 1));
+	pr_debug("playpaq_wm8510: Request rate = %d, actual rate = %d\n",
+		 rate, actual_rate);
+
+
+	return cd;
+}
+#endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */
+
+
+
+static int playpaq_wm8510_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;
+	struct at32_ssc_info *ssc_p = cpu_dai->private_data;
+	struct ssc_device *ssc = ssc_p->ssc;
+	unsigned int pll_out = 0, bclk = 0, mclk_div = 0;
+	int ret;
+
+
+	/* Due to difficulties with getting the correct clocks from the AT32's
+	 * PLL0, we're going to let the CODEC be in charge of all the clocks
+	 */
+#if !defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE
+	const unsigned int fmt = (SND_SOC_DAIFMT_I2S |
+				  SND_SOC_DAIFMT_NB_NF |
+				  SND_SOC_DAIFMT_CBM_CFM);
+#else
+	struct ssc_clock_data cd;
+	const unsigned int fmt = (SND_SOC_DAIFMT_I2S |
+				  SND_SOC_DAIFMT_NB_NF |
+				  SND_SOC_DAIFMT_CBS_CFS);
+#endif
+
+	if (ssc == NULL) {
+		pr_warning("playpaq_wm8510_hw_params: ssc is NULL!\n");
+		return -EINVAL;
+	}
+
+
+	/*
+	 * Figure out PLL and BCLK dividers for WM8510
+	 */
+	switch (params_rate(params)) {
+	case 48000:
+		pll_out = 12288000;
+		mclk_div = WM8510_MCLKDIV_1;
+		bclk = WM8510_BCLKDIV_8;
+		break;
+
+	case 44100:
+		pll_out = 11289600;
+		mclk_div = WM8510_MCLKDIV_1;
+		bclk = WM8510_BCLKDIV_8;
+		break;
+
+	case 22050:
+		pll_out = 11289600;
+		mclk_div = WM8510_MCLKDIV_2;
+		bclk = WM8510_BCLKDIV_8;
+		break;
+
+	case 16000:
+		pll_out = 12288000;
+		mclk_div = WM8510_MCLKDIV_3;
+		bclk = WM8510_BCLKDIV_8;
+		break;
+
+	case 11025:
+		pll_out = 11289600;
+		mclk_div = WM8510_MCLKDIV_4;
+		bclk = WM8510_BCLKDIV_8;
+		break;
+
+	case 8000:
+		pll_out = 12288000;
+		mclk_div = WM8510_MCLKDIV_6;
+		bclk = WM8510_BCLKDIV_8;
+		break;
+
+	default:
+		pr_warning("playpaq_wm8510: Unsupported sample rate %d\n",
+			   params_rate(params));
+		return -EINVAL;
+	}
+
+
+	/*
+	 * set CPU and CODEC DAI configuration
+	 */
+	ret = snd_soc_dai_set_fmt(codec_dai, fmt);
+	if (ret < 0) {
+		pr_warning("playpaq_wm8510: "
+			   "Failed to set CODEC DAI format (%d)\n",
+			   ret);
+		return ret;
+	}
+	ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
+	if (ret < 0) {
+		pr_warning("playpaq_wm8510: "
+			   "Failed to set CPU DAI format (%d)\n",
+			   ret);
+		return ret;
+	}
+
+
+	/*
+	 * Set CPU clock configuration
+	 */
+#if defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE
+	cd = playpaq_wm8510_calc_ssc_clock(params, cpu_dai);
+	pr_debug("playpaq_wm8510: cmr_div = %d, period = %d\n",
+		 cd.cmr_div, cd.period);
+	ret = snd_soc_dai_set_clkdiv(cpu_dai, AT32_SSC_CMR_DIV, cd.cmr_div);
+	if (ret < 0) {
+		pr_warning("playpaq_wm8510: Failed to set CPU CMR_DIV (%d)\n",
+			   ret);
+		return ret;
+	}
+	ret = snd_soc_dai_set_clkdiv(cpu_dai, AT32_SSC_TCMR_PERIOD,
+					  cd.period);
+	if (ret < 0) {
+		pr_warning("playpaq_wm8510: "
+			   "Failed to set CPU transmit period (%d)\n",
+			   ret);
+		return ret;
+	}
+#endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */
+
+
+	/*
+	 * Set CODEC clock configuration
+	 */
+	pr_debug("playpaq_wm8510: "
+		 "pll_in = %ld, pll_out = %u, bclk = %x, mclk = %x\n",
+		 clk_get_rate(CODEC_CLK), pll_out, bclk, mclk_div);
+
+
+#if !defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE
+	ret = snd_soc_dai_set_clkdiv(codec_dai, WM8510_BCLKDIV, bclk);
+	if (ret < 0) {
+		pr_warning
+		    ("playpaq_wm8510: Failed to set CODEC DAI BCLKDIV (%d)\n",
+		     ret);
+		return ret;
+	}
+#endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */
+
+
+	ret = snd_soc_dai_set_pll(codec_dai, 0,
+					 clk_get_rate(CODEC_CLK), pll_out);
+	if (ret < 0) {
+		pr_warning("playpaq_wm8510: Failed to set CODEC DAI PLL (%d)\n",
+			   ret);
+		return ret;
+	}
+
+
+	ret = snd_soc_dai_set_clkdiv(codec_dai, WM8510_MCLKDIV, mclk_div);
+	if (ret < 0) {
+		pr_warning("playpaq_wm8510: Failed to set CODEC MCLKDIV (%d)\n",
+			   ret);
+		return ret;
+	}
+
+
+	return 0;
+}
+
+
+
+static struct snd_soc_ops playpaq_wm8510_ops = {
+	.hw_params = playpaq_wm8510_hw_params,
+};
+
+
+
+static const struct snd_soc_dapm_widget playpaq_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 SPKOUT */
+	{"Ext Spk", NULL, "SPKOUTP"},
+	{"Ext Spk", NULL, "SPKOUTN"},
+
+	{"Mic Bias", NULL, "Int Mic"},
+	{"MICN", NULL, "Mic Bias"},
+	{"MICP", NULL, "Mic Bias"},
+};
+
+
+
+static int playpaq_wm8510_init(struct snd_soc_codec *codec)
+{
+	int i;
+
+	/*
+	 * Add DAPM widgets
+	 */
+	for (i = 0; i < ARRAY_SIZE(playpaq_dapm_widgets); i++)
+		snd_soc_dapm_new_control(codec, &playpaq_dapm_widgets[i]);
+
+
+
+	/*
+	 * Setup audio path interconnects
+	 */
+	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
+
+
+
+	/* always connected pins */
+	snd_soc_dapm_enable_pin(codec, "Int Mic");
+	snd_soc_dapm_enable_pin(codec, "Ext Spk");
+	snd_soc_dapm_sync(codec);
+
+
+
+	/* Make CSB show PLL rate */
+	snd_soc_dai_set_clkdiv(codec->dai, WM8510_OPCLKDIV,
+				       WM8510_OPCLKDIV_1 | 4);
+
+	return 0;
+}
+
+
+
+static struct snd_soc_dai_link playpaq_wm8510_dai = {
+	.name = "WM8510",
+	.stream_name = "WM8510 PCM",
+	.cpu_dai = &at32_ssc_dai[0],
+	.codec_dai = &wm8510_dai,
+	.init = playpaq_wm8510_init,
+	.ops = &playpaq_wm8510_ops,
+};
+
+
+
+static struct snd_soc_machine snd_soc_machine_playpaq = {
+	.name = "LRS_PlayPaq_WM8510",
+	.dai_link = &playpaq_wm8510_dai,
+	.num_links = 1,
+};
+
+
+
+static struct wm8510_setup_data playpaq_wm8510_setup = {
+	.i2c_bus = 0,
+	.i2c_address = 0x1a,
+};
+
+
+
+static struct snd_soc_device playpaq_wm8510_snd_devdata = {
+	.machine = &snd_soc_machine_playpaq,
+	.platform = &at32_soc_platform,
+	.codec_dev = &soc_codec_dev_wm8510,
+	.codec_data = &playpaq_wm8510_setup,
+};
+
+static struct platform_device *playpaq_snd_device;
+
+
+static int __init playpaq_asoc_init(void)
+{
+	int ret = 0;
+	struct at32_ssc_info *ssc_p = playpaq_wm8510_dai.cpu_dai->private_data;
+	struct ssc_device *ssc = NULL;
+
+
+	/*
+	 * Request SSC device
+	 */
+	ssc = ssc_request(0);
+	if (IS_ERR(ssc)) {
+		ret = PTR_ERR(ssc);
+		goto err_ssc;
+	}
+	ssc_p->ssc = ssc;
+
+
+	/*
+	 * Configure MCLK for WM8510
+	 */
+	_gclk0 = clk_get(NULL, "gclk0");
+	if (IS_ERR(_gclk0)) {
+		_gclk0 = NULL;
+		goto err_gclk0;
+	}
+	_pll0 = clk_get(NULL, "pll0");
+	if (IS_ERR(_pll0)) {
+		_pll0 = NULL;
+		goto err_pll0;
+	}
+	if (clk_set_parent(_gclk0, _pll0)) {
+		pr_warning("snd-soc-playpaq: "
+			   "Failed to set PLL0 as parent for DAC clock\n");
+		goto err_set_clk;
+	}
+	clk_set_rate(CODEC_CLK, 12000000);
+	clk_enable(CODEC_CLK);
+
+#if defined CONFIG_AT32_ENHANCED_PORTMUX
+	at32_select_periph(MCLK_PIN, MCLK_PERIPH, 0);
+#endif
+
+
+	/*
+	 * Create and register platform device
+	 */
+	playpaq_snd_device = platform_device_alloc("soc-audio", 0);
+	if (playpaq_snd_device == NULL) {
+		ret = -ENOMEM;
+		goto err_device_alloc;
+	}
+
+	platform_set_drvdata(playpaq_snd_device, &playpaq_wm8510_snd_devdata);
+	playpaq_wm8510_snd_devdata.dev = &playpaq_snd_device->dev;
+
+	ret = platform_device_add(playpaq_snd_device);
+	if (ret) {
+		pr_warning("playpaq_wm8510: platform_device_add failed (%d)\n",
+			   ret);
+		goto err_device_add;
+	}
+
+	return 0;
+
+
+err_device_add:
+	if (playpaq_snd_device != NULL) {
+		platform_device_put(playpaq_snd_device);
+		playpaq_snd_device = NULL;
+	}
+err_device_alloc:
+err_set_clk:
+	if (_pll0 != NULL) {
+		clk_put(_pll0);
+		_pll0 = NULL;
+	}
+err_pll0:
+	if (_gclk0 != NULL) {
+		clk_put(_gclk0);
+		_gclk0 = NULL;
+	}
+err_gclk0:
+	ssc_free(ssc);
+err_ssc:
+	return ret;
+}
+
+
+static void __exit playpaq_asoc_exit(void)
+{
+	struct at32_ssc_info *ssc_p = playpaq_wm8510_dai.cpu_dai->private_data;
+	struct ssc_device *ssc;
+
+	if (ssc_p != NULL) {
+		ssc = ssc_p->ssc;
+		if (ssc != NULL)
+			ssc_free(ssc);
+		ssc_p->ssc = NULL;
+	}
+
+	if (_gclk0 != NULL) {
+		clk_put(_gclk0);
+		_gclk0 = NULL;
+	}
+	if (_pll0 != NULL) {
+		clk_put(_pll0);
+		_pll0 = NULL;
+	}
+
+#if defined CONFIG_AT32_ENHANCED_PORTMUX
+	at32_free_pin(MCLK_PIN);
+#endif
+
+	platform_device_unregister(playpaq_snd_device);
+	playpaq_snd_device = NULL;
+}
+
+module_init(playpaq_asoc_init);
+module_exit(playpaq_asoc_exit);
+
+MODULE_AUTHOR("Geoffrey Wossum <gwossum@acm.org>");
+MODULE_DESCRIPTION("ASoC machine driver for LRS PlayPaq");
+MODULE_LICENSE("GPL");