--- /dev/null
+/**
+ * Freescale P1022DS ALSA SoC Machine driver
+ *
+ * Author: Timur Tabi <timur@freescale.com>
+ *
+ * Copyright 2010 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.
+ */
+
+#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"
+
+/* 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_85xx __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;
+
+#define DAI_NAME_SIZE 32
+
+/**
+ * machine_data: machine-specific ASoC device data
+ *
+ * This structure contains data for a single sound platform device on an
+ * P1022 DS. 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 ssi_id; /* 0 = SSI1, 1 = SSI2, etc */
+ unsigned int dma_id[2]; /* 0 = DMA1, 1 = DMA2, etc */
+ unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
+ char codec_name[DAI_NAME_SIZE];
+ char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
+};
+
+/**
+ * p1022_ds_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_ds_machine_probe(struct platform_device *sound_device)
+{
+ struct snd_soc_card *card = platform_get_drvdata(sound_device);
+ struct machine_data *mdata =
+ container_of(card, struct machine_data, card);
+ struct ccsr_guts_85xx __iomem *guts;
+
+ guts = ioremap(guts_phys, sizeof(struct ccsr_guts_85xx));
+ 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_ds_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_ds_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\n");
+ return ret;
+ }
+
+ /*
+ * Tell the codec driver what the MCLK frequency is, and whether it's
+ * a slave or master.
+ */
+ ret = snd_soc_dai_set_sysclk(rtd->codec_dai, 0, mdata->clk_frequency,
+ mdata->codec_clk_direction);
+ if (ret < 0) {
+ dev_err(dev, "could not set codec driver clock params\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * p1022_ds_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_ds_machine_remove(struct platform_device *sound_device)
+{
+ struct snd_soc_card *card = platform_get_drvdata(sound_device);
+ struct machine_data *mdata =
+ container_of(card, struct machine_data, card);
+ struct ccsr_guts_85xx __iomem *guts;
+
+ guts = ioremap(guts_phys, sizeof(struct ccsr_guts_85xx));
+ 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_ds_ops: ASoC machine driver operations
+ */
+static struct snd_soc_ops p1022_ds_ops = {
+ .startup = p1022_ds_startup,
+};
+
+/**
+ * get_node_by_phandle_name - get a node by its phandle name
+ *
+ * This function takes a node, the name of a property in that node, and a
+ * compatible string. Assuming the property is a phandle to another node,
+ * it returns that node, (optionally) if that node is compatible.
+ *
+ * If the property is not a phandle, or the node it points to is not compatible
+ * with the specific string, then NULL is returned.
+ */
+static struct device_node *get_node_by_phandle_name(struct device_node *np,
+ const char *name, const char *compatible)
+{
+ np = of_parse_phandle(np, name, 0);
+ if (!np)
+ return NULL;
+
+ if (!of_device_is_compatible(np, compatible)) {
+ of_node_put(np);
+ return NULL;
+ }
+
+ return np;
+}
+
+/**
+ * get_parent_cell_index -- return the cell-index of the parent of a node
+ *
+ * Return the value of the cell-index property of the parent of the given
+ * node. This is used for DMA channel nodes that need to know the DMA ID
+ * of the controller they are on.
+ */
+static int get_parent_cell_index(struct device_node *np)
+{
+ struct device_node *parent = of_get_parent(np);
+ const u32 *iprop;
+ int ret = -1;
+
+ if (!parent)
+ return -1;
+
+ iprop = of_get_property(parent, "cell-index", NULL);
+ if (iprop)
+ ret = *iprop;
+
+ of_node_put(parent);
+
+ return ret;
+}
+
+/**
+ * codec_node_dev_name - determine the dev_name for a codec node
+ *
+ * This function determines the dev_name for an I2C node. This is the name
+ * that would be returned by dev_name() if this device_node were part of a
+ * 'struct device' It's ugly and hackish, but it works.
+ *
+ * The dev_name for such devices include the bus number and I2C address. For
+ * example, "cs4270-codec.0-004f".
+ */
+static int codec_node_dev_name(struct device_node *np, char *buf, size_t len)
+{
+ const u32 *iprop;
+ int bus, addr;
+ char temp[DAI_NAME_SIZE];
+
+ of_modalias_node(np, temp, DAI_NAME_SIZE);
+
+ iprop = of_get_property(np, "reg", NULL);
+ if (!iprop)
+ return -EINVAL;
+
+ addr = *iprop;
+
+ bus = get_parent_cell_index(np);
+ if (bus < 0)
+ return bus;
+
+ snprintf(buf, len, "%s-codec.%u-%04x", temp, bus, addr);
+
+ return 0;
+}
+
+static int get_dma_channel(struct device_node *ssi_np,
+ const char *compatible,
+ struct snd_soc_dai_link *dai,
+ unsigned int *dma_channel_id,
+ unsigned int *dma_id)
+{
+ struct resource res;
+ struct device_node *dma_channel_np;
+ const u32 *iprop;
+ int ret;
+
+ dma_channel_np = get_node_by_phandle_name(ssi_np, compatible,
+ "fsl,ssi-dma-channel");
+ if (!dma_channel_np)
+ return -EINVAL;
+
+ /* Determine the dev_name for the device_node. This code mimics the
+ * behavior of of_device_make_bus_id(). We need this because ASoC uses
+ * the dev_name() of the device to match the platform (DMA) device with
+ * the CPU (SSI) device. It's all ugly and hackish, but it works (for
+ * now).
+ *
+ * dai->platform name should already point to an allocated buffer.
+ */
+ ret = of_address_to_resource(dma_channel_np, 0, &res);
+ if (ret)
+ return ret;
+ snprintf((char *)dai->platform_name, DAI_NAME_SIZE, "%llx.%s",
+ (unsigned long long) res.start, dma_channel_np->name);
+
+ iprop = of_get_property(dma_channel_np, "cell-index", NULL);
+ if (!iprop) {
+ of_node_put(dma_channel_np);
+ return -EINVAL;
+ }
+
+ *dma_channel_id = *iprop;
+ *dma_id = get_parent_cell_index(dma_channel_np);
+ of_node_put(dma_channel_np);
+
+ return 0;
+}
+
+/**
+ * p1022_ds_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_ds_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 platform_device *sound_device = NULL;
+ struct machine_data *mdata;
+ int ret = -ENODEV;
+ const char *sprop;
+ const u32 *iprop;
+
+ /* 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)
+ return -ENOMEM;
+
+ mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
+ mdata->dai[0].ops = &p1022_ds_ops;
+
+ /* Determine the codec name, it will be used as the codec DAI name */
+ ret = codec_node_dev_name(codec_np, mdata->codec_name, DAI_NAME_SIZE);
+ if (ret) {
+ dev_err(&pdev->dev, "invalid codec node %s\n",
+ codec_np->full_name);
+ ret = -EINVAL;
+ goto error;
+ }
+ mdata->dai[0].codec_name = mdata->codec_name;
+
+ /* 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 = "wm8776-hifi-playback";
+ mdata->dai[1].codec_dai_name = "wm8776-hifi-capture";
+
+ /* Get the device ID */
+ iprop = of_get_property(np, "cell-index", NULL);
+ if (!iprop) {
+ dev_err(&pdev->dev, "cell-index property not found\n");
+ ret = -EINVAL;
+ goto error;
+ }
+ mdata->ssi_id = *iprop;
+
+ /* Get the serial format and clock direction. */
+ sprop = of_get_property(np, "fsl,mode", NULL);
+ if (!sprop) {
+ dev_err(&pdev->dev, "fsl,mode property not found\n");
+ ret = -EINVAL;
+ goto error;
+ }
+
+ if (strcasecmp(sprop, "i2s-slave") == 0) {
+ mdata->dai_format = SND_SOC_DAIFMT_I2S;
+ 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 = *iprop;
+ } else if (strcasecmp(sprop, "i2s-master") == 0) {
+ mdata->dai_format = SND_SOC_DAIFMT_I2S;
+ mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
+ mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
+ } else if (strcasecmp(sprop, "lj-slave") == 0) {
+ mdata->dai_format = SND_SOC_DAIFMT_LEFT_J;
+ mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
+ mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
+ } else if (strcasecmp(sprop, "lj-master") == 0) {
+ mdata->dai_format = SND_SOC_DAIFMT_LEFT_J;
+ mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
+ mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
+ } else if (strcasecmp(sprop, "rj-slave") == 0) {
+ mdata->dai_format = SND_SOC_DAIFMT_RIGHT_J;
+ mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
+ mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
+ } else if (strcasecmp(sprop, "rj-master") == 0) {
+ mdata->dai_format = SND_SOC_DAIFMT_RIGHT_J;
+ mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
+ mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
+ } else if (strcasecmp(sprop, "ac97-slave") == 0) {
+ mdata->dai_format = SND_SOC_DAIFMT_AC97;
+ mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
+ mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
+ } else if (strcasecmp(sprop, "ac97-master") == 0) {
+ mdata->dai_format = SND_SOC_DAIFMT_AC97;
+ mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
+ mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
+ } else {
+ dev_err(&pdev->dev,
+ "unrecognized fsl,mode property '%s'\n", sprop);
+ ret = -EINVAL;
+ goto error;
+ }
+
+ 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 = 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\n");
+ goto error;
+ }
+
+ /* Find the capture DMA channel to use. */
+ mdata->dai[1].platform_name = mdata->platform_name[1];
+ ret = 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\n");
+ 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_ds_machine_probe;
+ mdata->card.remove = p1022_ds_machine_remove;
+ mdata->card.name = pdev->name; /* The platform driver name */
+ mdata->card.num_links = 2;
+ mdata->card.dai_link = mdata->dai;
+
+ /* Allocate a new audio platform device structure */
+ sound_device = platform_device_alloc("soc-audio", -1);
+ if (!sound_device) {
+ dev_err(&pdev->dev, "platform device alloc failed\n");
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ /* Associate the card data with the sound device */
+ platform_set_drvdata(sound_device, &mdata->card);
+
+ /* Register with ASoC */
+ ret = platform_device_add(sound_device);
+ if (ret) {
+ dev_err(&pdev->dev, "platform device add failed\n");
+ goto error;
+ }
+
+ of_node_put(codec_np);
+
+ return 0;
+
+error:
+ of_node_put(codec_np);
+
+ if (sound_device)
+ platform_device_unregister(sound_device);
+
+ kfree(mdata);
+
+ return ret;
+}
+
+/**
+ * p1022_ds_remove: remove the platform device
+ *
+ * This function is called when the platform device is removed.
+ */
+static int __devexit p1022_ds_remove(struct platform_device *pdev)
+{
+ struct platform_device *sound_device = dev_get_drvdata(&pdev->dev);
+ struct snd_soc_card *card = platform_get_drvdata(sound_device);
+ struct machine_data *mdata =
+ container_of(card, struct machine_data, card);
+
+ platform_device_unregister(sound_device);
+
+ kfree(mdata);
+ sound_device->dev.platform_data = NULL;
+
+ dev_set_drvdata(&pdev->dev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver p1022_ds_driver = {
+ .probe = p1022_ds_probe,
+ .remove = __devexit_p(p1022_ds_remove),
+ .driver = {
+ /* The name must match the 'model' property in the device tree,
+ * in lowercase letters, but only the part after that last
+ * comma. This is because some model properties have a "fsl,"
+ * prefix.
+ */
+ .name = "snd-soc-p1022",
+ .owner = THIS_MODULE,
+ },
+};
+
+/**
+ * p1022_ds_init: machine driver initialization.
+ *
+ * This function is called when this module is loaded.
+ */
+static int __init p1022_ds_init(void)
+{
+ struct device_node *guts_np;
+ struct resource res;
+
+ pr_info("Freescale P1022 DS ALSA SoC machine driver\n");
+
+ /* 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("p1022-ds: missing/invalid global utilities node\n");
+ return -EINVAL;
+ }
+ guts_phys = res.start;
+ of_node_put(guts_np);
+
+ return platform_driver_register(&p1022_ds_driver);
+}
+
+/**
+ * p1022_ds_exit: machine driver exit
+ *
+ * This function is called when this driver is unloaded.
+ */
+static void __exit p1022_ds_exit(void)
+{
+ platform_driver_unregister(&p1022_ds_driver);
+}
+
+module_init(p1022_ds_init);
+module_exit(p1022_ds_exit);
+
+MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
+MODULE_DESCRIPTION("Freescale P1022 DS ALSA SoC machine driver");
+MODULE_LICENSE("GPL v2");
projects / openwrt / staging / blogic.git / commitdiff