| /** |
| * 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 snd_soc_card *card) |
| { |
| 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 snd_soc_card *card) |
| { |
| 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 = be32_to_cpup(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 = be32_to_cpup(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) { |
| of_node_put(dma_channel_np); |
| 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 = be32_to_cpup(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) { |
| ret = -ENOMEM; |
| goto error_put; |
| } |
| |
| 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 = be32_to_cpup(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 = be32_to_cpup(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; |
| } |
| dev_set_drvdata(&pdev->dev, sound_device); |
| |
| of_node_put(codec_np); |
| |
| return 0; |
| |
| error: |
| if (sound_device) |
| platform_device_unregister(sound_device); |
| |
| kfree(mdata); |
| error_put: |
| of_node_put(codec_np); |
| 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"); |