/** * Freescale P1022DS ALSA SoC Machine driver * * Author: Timur Tabi * * 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 #include #include #include #include #include #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 "); MODULE_DESCRIPTION("Freescale P1022 DS ALSA SoC machine driver"); MODULE_LICENSE("GPL v2");