diff options
Diffstat (limited to 'sound/soc/fsl/p1022_rdk.c')
| -rw-r--r-- | sound/soc/fsl/p1022_rdk.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/sound/soc/fsl/p1022_rdk.c b/sound/soc/fsl/p1022_rdk.c new file mode 100644 index 000000000..4afbdd610 --- /dev/null +++ b/sound/soc/fsl/p1022_rdk.c @@ -0,0 +1,391 @@ +/** + * 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/fsl/guts.h> +#include <linux/interrupt.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/slab.h> +#include <sound/soc.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 const 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 = to_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 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 = p1022_rdk_remove, + .driver = { + /* + * The name must match 'compatible' property in the device tree, + * in lowercase letters. + */ + .name = "snd-soc-p1022rdk", + }, +}; + +/** + * 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"); |