ASoC: add support for the Freescale / iVeia P1022 RDK reference board

This small reference boards has a Freescale P1022 dual-core PowerPC SOC
and a Wolfson Microelectronics WM8960 codec.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

3 files changed, 410 insertions, 0 deletions

diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
index 4563b28bd625..8e48432809af 100644
--- a/sound/soc/fsl/Kconfig
+++ b/sound/soc/fsl/Kconfig
@@ -46,6 +46,20 @@ config SND_SOC_P1022_DS
 	  This will also include the Wolfson Microelectronics WM8776 codec
 	  driver.
 
+config SND_SOC_P1022_RDK
+	tristate "ALSA SoC support for the Freescale / iVeia P1022 RDK board"
+	# I2C is necessary for the WM8960 driver
+	depends on P1022_RDK && I2C
+	select SND_SOC_FSL_SSI
+	select SND_SOC_FSL_UTILS
+	select SND_SOC_POWERPC_DMA
+	select SND_SOC_WM8960
+	default y if P1022_RDK
+	help
+	  Say Y if you want to enable audio on the Freescale / iVeia
+	  P1022 RDK board.  This will also include the Wolfson
+	  Microelectronics WM8960 codec driver.
+
 config SND_SOC_MPC5200_I2S
 	tristate "Freescale MPC5200 PSC in I2S mode driver"
 	depends on PPC_MPC52xx && PPC_BESTCOMM
diff --git a/sound/soc/fsl/Makefile b/sound/soc/fsl/Makefile
index 5f3cf3f52ea0..515ba665f97c 100644
--- a/sound/soc/fsl/Makefile
+++ b/sound/soc/fsl/Makefile
@@ -6,6 +6,10 @@ obj-$(CONFIG_SND_SOC_MPC8610_HPCD) += snd-soc-mpc8610-hpcd.o
 snd-soc-p1022-ds-objs := p1022_ds.o
 obj-$(CONFIG_SND_SOC_P1022_DS) += snd-soc-p1022-ds.o
 
+# P1022 RDK Machine Support
+snd-soc-p1022-rdk-objs := p1022_rdk.o
+obj-$(CONFIG_SND_SOC_P1022_RDK) += snd-soc-p1022-rdk.o
+
 # Freescale PowerPC SSI/DMA Platform Support
 snd-soc-fsl-ssi-objs := fsl_ssi.o
 snd-soc-fsl-utils-objs := fsl_utils.o
diff --git a/sound/soc/fsl/p1022_rdk.c b/sound/soc/fsl/p1022_rdk.c
new file mode 100644
index 000000000000..897e32ffdc42
--- /dev/null
+++ b/sound/soc/fsl/p1022_rdk.c
@@ -0,0 +1,392 @@
+/**
+ * Freescale P1022RDK ALSA SoC Machine driver
+ *
+ * Author: Timur Tabi <timur@freescale.com>
+ *
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ *
+ * Note: in order for audio to work correctly, the output controls need
+ * to be enabled, because they control the clock.  So for playback, for
+ * example:
+ *
+ *      amixer sset 'Left Output Mixer PCM' on
+ *      amixer sset 'Right Output Mixer PCM' on
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/of_device.h>
+#include <linux/slab.h>
+#include <sound/soc.h>
+#include <asm/fsl_guts.h>
+
+#include "fsl_dma.h"
+#include "fsl_ssi.h"
+#include "fsl_utils.h"
+
+/* P1022-specific PMUXCR and DMUXCR bit definitions */
+
+#define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK	0x0001c000
+#define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI	0x00010000
+#define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI		0x00018000
+
+#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK	0x00000c00
+#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI	0x00000000
+
+#define CCSR_GUTS_DMUXCR_PAD	1	/* DMA controller/channel set to pad */
+#define CCSR_GUTS_DMUXCR_SSI	2	/* DMA controller/channel set to SSI */
+
+/*
+ * Set the DMACR register in the GUTS
+ *
+ * The DMACR register determines the source of initiated transfers for each
+ * channel on each DMA controller.  Rather than have a bunch of repetitive
+ * macros for the bit patterns, we just have a function that calculates
+ * them.
+ *
+ * guts: Pointer to GUTS structure
+ * co: The DMA controller (0 or 1)
+ * ch: The channel on the DMA controller (0, 1, 2, or 3)
+ * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
+ */
+static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
+	unsigned int co, unsigned int ch, unsigned int device)
+{
+	unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
+
+	clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
+}
+
+/* There's only one global utilities register */
+static phys_addr_t guts_phys;
+
+/**
+ * machine_data: machine-specific ASoC device data
+ *
+ * This structure contains data for a single sound platform device on an
+ * P1022 RDK.  Some of the data is taken from the device tree.
+ */
+struct machine_data {
+	struct snd_soc_dai_link dai[2];
+	struct snd_soc_card card;
+	unsigned int dai_format;
+	unsigned int codec_clk_direction;
+	unsigned int cpu_clk_direction;
+	unsigned int clk_frequency;
+	unsigned int dma_id[2];		/* 0 = DMA1, 1 = DMA2, etc */
+	unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
+	char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
+};
+
+/**
+ * p1022_rdk_machine_probe: initialize the board
+ *
+ * This function is used to initialize the board-specific hardware.
+ *
+ * Here we program the DMACR and PMUXCR registers.
+ */
+static int p1022_rdk_machine_probe(struct snd_soc_card *card)
+{
+	struct machine_data *mdata =
+		container_of(card, struct machine_data, card);
+	struct ccsr_guts __iomem *guts;
+
+	guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
+	if (!guts) {
+		dev_err(card->dev, "could not map global utilities\n");
+		return -ENOMEM;
+	}
+
+	/* Enable SSI Tx signal */
+	clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
+			CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
+
+	/* Enable SSI Rx signal */
+	clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
+			CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
+
+	/* Enable DMA Channel for SSI */
+	guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
+			CCSR_GUTS_DMUXCR_SSI);
+
+	guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
+			CCSR_GUTS_DMUXCR_SSI);
+
+	iounmap(guts);
+
+	return 0;
+}
+
+/**
+ * p1022_rdk_startup: program the board with various hardware parameters
+ *
+ * This function takes board-specific information, like clock frequencies
+ * and serial data formats, and passes that information to the codec and
+ * transport drivers.
+ */
+static int p1022_rdk_startup(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct machine_data *mdata =
+		container_of(rtd->card, struct machine_data, card);
+	struct device *dev = rtd->card->dev;
+	int ret = 0;
+
+	/* Tell the codec driver what the serial protocol is. */
+	ret = snd_soc_dai_set_fmt(rtd->codec_dai, mdata->dai_format);
+	if (ret < 0) {
+		dev_err(dev, "could not set codec driver audio format (ret=%i)\n",
+			ret);
+		return ret;
+	}
+
+	ret = snd_soc_dai_set_pll(rtd->codec_dai, 0, 0, mdata->clk_frequency,
+		mdata->clk_frequency);
+	if (ret < 0) {
+		dev_err(dev, "could not set codec PLL frequency (ret=%i)\n",
+			ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * p1022_rdk_machine_remove: Remove the sound device
+ *
+ * This function is called to remove the sound device for one SSI.  We
+ * de-program the DMACR and PMUXCR register.
+ */
+static int p1022_rdk_machine_remove(struct snd_soc_card *card)
+{
+	struct machine_data *mdata =
+		container_of(card, struct machine_data, card);
+	struct ccsr_guts __iomem *guts;
+
+	guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
+	if (!guts) {
+		dev_err(card->dev, "could not map global utilities\n");
+		return -ENOMEM;
+	}
+
+	/* Restore the signal routing */
+	clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
+	clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
+	guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
+	guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
+
+	iounmap(guts);
+
+	return 0;
+}
+
+/**
+ * p1022_rdk_ops: ASoC machine driver operations
+ */
+static struct snd_soc_ops p1022_rdk_ops = {
+	.startup = p1022_rdk_startup,
+};
+
+/**
+ * p1022_rdk_probe: platform probe function for the machine driver
+ *
+ * Although this is a machine driver, the SSI node is the "master" node with
+ * respect to audio hardware connections.  Therefore, we create a new ASoC
+ * device for each new SSI node that has a codec attached.
+ */
+static int p1022_rdk_probe(struct platform_device *pdev)
+{
+	struct device *dev = pdev->dev.parent;
+	/* ssi_pdev is the platform device for the SSI node that probed us */
+	struct platform_device *ssi_pdev =
+		container_of(dev, struct platform_device, dev);
+	struct device_node *np = ssi_pdev->dev.of_node;
+	struct device_node *codec_np = NULL;
+	struct machine_data *mdata;
+	const u32 *iprop;
+	int ret;
+
+	/* Find the codec node for this SSI. */
+	codec_np = of_parse_phandle(np, "codec-handle", 0);
+	if (!codec_np) {
+		dev_err(dev, "could not find codec node\n");
+		return -EINVAL;
+	}
+
+	mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
+	if (!mdata) {
+		ret = -ENOMEM;
+		goto error_put;
+	}
+
+	mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
+	mdata->dai[0].ops = &p1022_rdk_ops;
+
+	/* ASoC core can match codec with device node */
+	mdata->dai[0].codec_of_node = codec_np;
+
+	/*
+	 * We register two DAIs per SSI, one for playback and the other for
+	 * capture.  We support codecs that have separate DAIs for both playback
+	 * and capture.
+	 */
+	memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
+
+	/* The DAI names from the codec (snd_soc_dai_driver.name) */
+	mdata->dai[0].codec_dai_name = "wm8960-hifi";
+	mdata->dai[1].codec_dai_name = mdata->dai[0].codec_dai_name;
+
+	/*
+	 * Configure the SSI for I2S slave mode.  Older device trees have
+	 * an fsl,mode property, but we ignore that since there's really
+	 * only one way to configure the SSI.
+	 */
+	mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
+		SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
+	mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
+	mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
+
+	/*
+	 * In i2s-slave mode, the codec has its own clock source, so we
+	 * need to get the frequency from the device tree and pass it to
+	 * the codec driver.
+	 */
+	iprop = of_get_property(codec_np, "clock-frequency", NULL);
+	if (!iprop || !*iprop) {
+		dev_err(&pdev->dev, "codec bus-frequency property is missing or invalid\n");
+		ret = -EINVAL;
+		goto error;
+	}
+	mdata->clk_frequency = be32_to_cpup(iprop);
+
+	if (!mdata->clk_frequency) {
+		dev_err(&pdev->dev, "unknown clock frequency\n");
+		ret = -EINVAL;
+		goto error;
+	}
+
+	/* Find the playback DMA channel to use. */
+	mdata->dai[0].platform_name = mdata->platform_name[0];
+	ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
+				       &mdata->dma_channel_id[0],
+				       &mdata->dma_id[0]);
+	if (ret) {
+		dev_err(&pdev->dev, "missing/invalid playback DMA phandle (ret=%i)\n",
+			ret);
+		goto error;
+	}
+
+	/* Find the capture DMA channel to use. */
+	mdata->dai[1].platform_name = mdata->platform_name[1];
+	ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
+				       &mdata->dma_channel_id[1],
+				       &mdata->dma_id[1]);
+	if (ret) {
+		dev_err(&pdev->dev, "missing/invalid capture DMA phandle (ret=%i)\n",
+			ret);
+		goto error;
+	}
+
+	/* Initialize our DAI data structure.  */
+	mdata->dai[0].stream_name = "playback";
+	mdata->dai[1].stream_name = "capture";
+	mdata->dai[0].name = mdata->dai[0].stream_name;
+	mdata->dai[1].name = mdata->dai[1].stream_name;
+
+	mdata->card.probe = p1022_rdk_machine_probe;
+	mdata->card.remove = p1022_rdk_machine_remove;
+	mdata->card.name = pdev->name; /* The platform driver name */
+	mdata->card.owner = THIS_MODULE;
+	mdata->card.dev = &pdev->dev;
+	mdata->card.num_links = 2;
+	mdata->card.dai_link = mdata->dai;
+
+	/* Register with ASoC */
+	ret = snd_soc_register_card(&mdata->card);
+	if (ret) {
+		dev_err(&pdev->dev, "could not register card (ret=%i)\n", ret);
+		goto error;
+	}
+
+	return 0;
+
+error:
+	kfree(mdata);
+error_put:
+	of_node_put(codec_np);
+	return ret;
+}
+
+/**
+ * p1022_rdk_remove: remove the platform device
+ *
+ * This function is called when the platform device is removed.
+ */
+static int __devexit p1022_rdk_remove(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = platform_get_drvdata(pdev);
+	struct machine_data *mdata =
+		container_of(card, struct machine_data, card);
+
+	snd_soc_unregister_card(card);
+	kfree(mdata);
+
+	return 0;
+}
+
+static struct platform_driver p1022_rdk_driver = {
+	.probe = p1022_rdk_probe,
+	.remove = __devexit_p(p1022_rdk_remove),
+	.driver = {
+		/*
+		 * The name must match 'compatible' property in the device tree,
+		 * in lowercase letters.
+		 */
+		.name = "snd-soc-p1022rdk",
+		.owner = THIS_MODULE,
+	},
+};
+
+/**
+ * p1022_rdk_init: machine driver initialization.
+ *
+ * This function is called when this module is loaded.
+ */
+static int __init p1022_rdk_init(void)
+{
+	struct device_node *guts_np;
+	struct resource res;
+
+	/* Get the physical address of the global utilities registers */
+	guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
+	if (of_address_to_resource(guts_np, 0, &res)) {
+		pr_err("snd-soc-p1022rdk: missing/invalid global utils node\n");
+		of_node_put(guts_np);
+		return -EINVAL;
+	}
+	guts_phys = res.start;
+	of_node_put(guts_np);
+
+	return platform_driver_register(&p1022_rdk_driver);
+}
+
+/**
+ * p1022_rdk_exit: machine driver exit
+ *
+ * This function is called when this driver is unloaded.
+ */
+static void __exit p1022_rdk_exit(void)
+{
+	platform_driver_unregister(&p1022_rdk_driver);
+}
+
+late_initcall(p1022_rdk_init);
+module_exit(p1022_rdk_exit);
+
+MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
+MODULE_DESCRIPTION("Freescale / iVeia P1022 RDK ALSA SoC machine driver");
+MODULE_LICENSE("GPL v2");