| /* |
| * omap-mcpdm.c -- OMAP ALSA SoC DAI driver using McPDM port |
| * |
| * Copyright (C) 2009 - 2011 Texas Instruments |
| * |
| * Author: Misael Lopez Cruz <misael.lopez@ti.com> |
| * Contact: Jorge Eduardo Candelaria <x0107209@ti.com> |
| * Margarita Olaya <magi.olaya@ti.com> |
| * Peter Ujfalusi <peter.ujfalusi@ti.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| * 02110-1301 USA |
| * |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/interrupt.h> |
| #include <linux/err.h> |
| #include <linux/io.h> |
| #include <linux/irq.h> |
| #include <linux/slab.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/of_device.h> |
| |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/soc.h> |
| |
| #include "omap-mcpdm.h" |
| #include "omap-pcm.h" |
| |
| #define OMAP44XX_MCPDM_L3_BASE 0x49032000 |
| |
| struct omap_mcpdm { |
| struct device *dev; |
| unsigned long phys_base; |
| void __iomem *io_base; |
| int irq; |
| |
| struct mutex mutex; |
| |
| /* channel data */ |
| u32 dn_channels; |
| u32 up_channels; |
| |
| /* McPDM FIFO thresholds */ |
| u32 dn_threshold; |
| u32 up_threshold; |
| |
| /* McPDM dn offsets for rx1, and 2 channels */ |
| u32 dn_rx_offset; |
| }; |
| |
| /* |
| * Stream DMA parameters |
| */ |
| static struct omap_pcm_dma_data omap_mcpdm_dai_dma_params[] = { |
| { |
| .name = "Audio playback", |
| }, |
| { |
| .name = "Audio capture", |
| }, |
| }; |
| |
| static inline void omap_mcpdm_write(struct omap_mcpdm *mcpdm, u16 reg, u32 val) |
| { |
| __raw_writel(val, mcpdm->io_base + reg); |
| } |
| |
| static inline int omap_mcpdm_read(struct omap_mcpdm *mcpdm, u16 reg) |
| { |
| return __raw_readl(mcpdm->io_base + reg); |
| } |
| |
| #ifdef DEBUG |
| static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm) |
| { |
| dev_dbg(mcpdm->dev, "***********************\n"); |
| dev_dbg(mcpdm->dev, "IRQSTATUS_RAW: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS_RAW)); |
| dev_dbg(mcpdm->dev, "IRQSTATUS: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS)); |
| dev_dbg(mcpdm->dev, "IRQENABLE_SET: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_SET)); |
| dev_dbg(mcpdm->dev, "IRQENABLE_CLR: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_CLR)); |
| dev_dbg(mcpdm->dev, "IRQWAKE_EN: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_IRQWAKE_EN)); |
| dev_dbg(mcpdm->dev, "DMAENABLE_SET: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_SET)); |
| dev_dbg(mcpdm->dev, "DMAENABLE_CLR: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_CLR)); |
| dev_dbg(mcpdm->dev, "DMAWAKEEN: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_DMAWAKEEN)); |
| dev_dbg(mcpdm->dev, "CTRL: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL)); |
| dev_dbg(mcpdm->dev, "DN_DATA: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_DN_DATA)); |
| dev_dbg(mcpdm->dev, "UP_DATA: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_UP_DATA)); |
| dev_dbg(mcpdm->dev, "FIFO_CTRL_DN: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_DN)); |
| dev_dbg(mcpdm->dev, "FIFO_CTRL_UP: 0x%04x\n", |
| omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_UP)); |
| dev_dbg(mcpdm->dev, "***********************\n"); |
| } |
| #else |
| static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm) {} |
| #endif |
| |
| /* |
| * Enables the transfer through the PDM interface to/from the Phoenix |
| * codec by enabling the corresponding UP or DN channels. |
| */ |
| static void omap_mcpdm_start(struct omap_mcpdm *mcpdm) |
| { |
| u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL); |
| |
| ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST); |
| omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl); |
| |
| ctrl |= mcpdm->dn_channels | mcpdm->up_channels; |
| omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl); |
| |
| ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST); |
| omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl); |
| } |
| |
| /* |
| * Disables the transfer through the PDM interface to/from the Phoenix |
| * codec by disabling the corresponding UP or DN channels. |
| */ |
| static void omap_mcpdm_stop(struct omap_mcpdm *mcpdm) |
| { |
| u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL); |
| |
| ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST); |
| omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl); |
| |
| ctrl &= ~(mcpdm->dn_channels | mcpdm->up_channels); |
| omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl); |
| |
| ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST); |
| omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl); |
| |
| } |
| |
| /* |
| * Is the physical McPDM interface active. |
| */ |
| static inline int omap_mcpdm_active(struct omap_mcpdm *mcpdm) |
| { |
| return omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL) & |
| (MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK); |
| } |
| |
| /* |
| * Configures McPDM uplink, and downlink for audio. |
| * This function should be called before omap_mcpdm_start. |
| */ |
| static void omap_mcpdm_open_streams(struct omap_mcpdm *mcpdm) |
| { |
| omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_SET, |
| MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL | |
| MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL); |
| |
| /* Enable DN RX1/2 offset cancellation feature, if configured */ |
| if (mcpdm->dn_rx_offset) { |
| u32 dn_offset = mcpdm->dn_rx_offset; |
| |
| omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset); |
| dn_offset |= (MCPDM_DN_OFST_RX1_EN | MCPDM_DN_OFST_RX2_EN); |
| omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset); |
| } |
| |
| omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_DN, mcpdm->dn_threshold); |
| omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_UP, mcpdm->up_threshold); |
| |
| omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_SET, |
| MCPDM_DMA_DN_ENABLE | MCPDM_DMA_UP_ENABLE); |
| } |
| |
| /* |
| * Cleans McPDM uplink, and downlink configuration. |
| * This function should be called when the stream is closed. |
| */ |
| static void omap_mcpdm_close_streams(struct omap_mcpdm *mcpdm) |
| { |
| /* Disable irq request generation for downlink */ |
| omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR, |
| MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL); |
| |
| /* Disable DMA request generation for downlink */ |
| omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_DN_ENABLE); |
| |
| /* Disable irq request generation for uplink */ |
| omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR, |
| MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL); |
| |
| /* Disable DMA request generation for uplink */ |
| omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_UP_ENABLE); |
| |
| /* Disable RX1/2 offset cancellation */ |
| if (mcpdm->dn_rx_offset) |
| omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, 0); |
| } |
| |
| static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id) |
| { |
| struct omap_mcpdm *mcpdm = dev_id; |
| int irq_status; |
| |
| irq_status = omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS); |
| |
| /* Acknowledge irq event */ |
| omap_mcpdm_write(mcpdm, MCPDM_REG_IRQSTATUS, irq_status); |
| |
| if (irq_status & MCPDM_DN_IRQ_FULL) |
| dev_dbg(mcpdm->dev, "DN (playback) FIFO Full\n"); |
| |
| if (irq_status & MCPDM_DN_IRQ_EMPTY) |
| dev_dbg(mcpdm->dev, "DN (playback) FIFO Empty\n"); |
| |
| if (irq_status & MCPDM_DN_IRQ) |
| dev_dbg(mcpdm->dev, "DN (playback) write request\n"); |
| |
| if (irq_status & MCPDM_UP_IRQ_FULL) |
| dev_dbg(mcpdm->dev, "UP (capture) FIFO Full\n"); |
| |
| if (irq_status & MCPDM_UP_IRQ_EMPTY) |
| dev_dbg(mcpdm->dev, "UP (capture) FIFO Empty\n"); |
| |
| if (irq_status & MCPDM_UP_IRQ) |
| dev_dbg(mcpdm->dev, "UP (capture) write request\n"); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream, |
| struct snd_soc_dai *dai) |
| { |
| struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai); |
| |
| mutex_lock(&mcpdm->mutex); |
| |
| if (!dai->active) { |
| u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL); |
| |
| omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl | MCPDM_WD_EN); |
| omap_mcpdm_open_streams(mcpdm); |
| } |
| mutex_unlock(&mcpdm->mutex); |
| |
| snd_soc_dai_set_dma_data(dai, substream, |
| &omap_mcpdm_dai_dma_params[substream->stream]); |
| |
| return 0; |
| } |
| |
| static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream, |
| struct snd_soc_dai *dai) |
| { |
| struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai); |
| |
| mutex_lock(&mcpdm->mutex); |
| |
| if (!dai->active) { |
| if (omap_mcpdm_active(mcpdm)) { |
| omap_mcpdm_stop(mcpdm); |
| omap_mcpdm_close_streams(mcpdm); |
| } |
| } |
| |
| mutex_unlock(&mcpdm->mutex); |
| } |
| |
| static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params, |
| struct snd_soc_dai *dai) |
| { |
| struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai); |
| int stream = substream->stream; |
| struct omap_pcm_dma_data *dma_data; |
| int channels; |
| int link_mask = 0; |
| |
| channels = params_channels(params); |
| switch (channels) { |
| case 5: |
| if (stream == SNDRV_PCM_STREAM_CAPTURE) |
| /* up to 3 channels for capture */ |
| return -EINVAL; |
| link_mask |= 1 << 4; |
| case 4: |
| if (stream == SNDRV_PCM_STREAM_CAPTURE) |
| /* up to 3 channels for capture */ |
| return -EINVAL; |
| link_mask |= 1 << 3; |
| case 3: |
| link_mask |= 1 << 2; |
| case 2: |
| link_mask |= 1 << 1; |
| case 1: |
| link_mask |= 1 << 0; |
| break; |
| default: |
| /* unsupported number of channels */ |
| return -EINVAL; |
| } |
| |
| dma_data = snd_soc_dai_get_dma_data(dai, substream); |
| |
| /* Configure McPDM channels, and DMA packet size */ |
| if (stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| mcpdm->dn_channels = link_mask << 3; |
| dma_data->packet_size = |
| (MCPDM_DN_THRES_MAX - mcpdm->dn_threshold) * channels; |
| } else { |
| mcpdm->up_channels = link_mask << 0; |
| dma_data->packet_size = mcpdm->up_threshold * channels; |
| } |
| |
| return 0; |
| } |
| |
| static int omap_mcpdm_prepare(struct snd_pcm_substream *substream, |
| struct snd_soc_dai *dai) |
| { |
| struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai); |
| |
| if (!omap_mcpdm_active(mcpdm)) { |
| omap_mcpdm_start(mcpdm); |
| omap_mcpdm_reg_dump(mcpdm); |
| } |
| |
| return 0; |
| } |
| |
| static const struct snd_soc_dai_ops omap_mcpdm_dai_ops = { |
| .startup = omap_mcpdm_dai_startup, |
| .shutdown = omap_mcpdm_dai_shutdown, |
| .hw_params = omap_mcpdm_dai_hw_params, |
| .prepare = omap_mcpdm_prepare, |
| }; |
| |
| static int omap_mcpdm_probe(struct snd_soc_dai *dai) |
| { |
| struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai); |
| int ret; |
| |
| pm_runtime_enable(mcpdm->dev); |
| |
| /* Disable lines while request is ongoing */ |
| pm_runtime_get_sync(mcpdm->dev); |
| omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, 0x00); |
| |
| ret = request_irq(mcpdm->irq, omap_mcpdm_irq_handler, |
| 0, "McPDM", (void *)mcpdm); |
| |
| pm_runtime_put_sync(mcpdm->dev); |
| |
| if (ret) { |
| dev_err(mcpdm->dev, "Request for IRQ failed\n"); |
| pm_runtime_disable(mcpdm->dev); |
| } |
| |
| /* Configure McPDM threshold values */ |
| mcpdm->dn_threshold = 2; |
| mcpdm->up_threshold = MCPDM_UP_THRES_MAX - 3; |
| return ret; |
| } |
| |
| static int omap_mcpdm_remove(struct snd_soc_dai *dai) |
| { |
| struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai); |
| |
| free_irq(mcpdm->irq, (void *)mcpdm); |
| pm_runtime_disable(mcpdm->dev); |
| |
| return 0; |
| } |
| |
| #define OMAP_MCPDM_RATES (SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000) |
| #define OMAP_MCPDM_FORMATS SNDRV_PCM_FMTBIT_S32_LE |
| |
| static struct snd_soc_dai_driver omap_mcpdm_dai = { |
| .probe = omap_mcpdm_probe, |
| .remove = omap_mcpdm_remove, |
| .probe_order = SND_SOC_COMP_ORDER_LATE, |
| .remove_order = SND_SOC_COMP_ORDER_EARLY, |
| .playback = { |
| .channels_min = 1, |
| .channels_max = 5, |
| .rates = OMAP_MCPDM_RATES, |
| .formats = OMAP_MCPDM_FORMATS, |
| .sig_bits = 24, |
| }, |
| .capture = { |
| .channels_min = 1, |
| .channels_max = 3, |
| .rates = OMAP_MCPDM_RATES, |
| .formats = OMAP_MCPDM_FORMATS, |
| .sig_bits = 24, |
| }, |
| .ops = &omap_mcpdm_dai_ops, |
| }; |
| |
| void omap_mcpdm_configure_dn_offsets(struct snd_soc_pcm_runtime *rtd, |
| u8 rx1, u8 rx2) |
| { |
| struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(rtd->cpu_dai); |
| |
| mcpdm->dn_rx_offset = MCPDM_DNOFST_RX1(rx1) | MCPDM_DNOFST_RX2(rx2); |
| } |
| EXPORT_SYMBOL_GPL(omap_mcpdm_configure_dn_offsets); |
| |
| static int asoc_mcpdm_probe(struct platform_device *pdev) |
| { |
| struct omap_mcpdm *mcpdm; |
| struct resource *res; |
| |
| mcpdm = devm_kzalloc(&pdev->dev, sizeof(struct omap_mcpdm), GFP_KERNEL); |
| if (!mcpdm) |
| return -ENOMEM; |
| |
| platform_set_drvdata(pdev, mcpdm); |
| |
| mutex_init(&mcpdm->mutex); |
| |
| res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma"); |
| if (res == NULL) |
| return -ENOMEM; |
| |
| omap_mcpdm_dai_dma_params[0].port_addr = res->start + MCPDM_REG_DN_DATA; |
| omap_mcpdm_dai_dma_params[1].port_addr = res->start + MCPDM_REG_UP_DATA; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (res == NULL) |
| return -ENOMEM; |
| |
| res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "dn_link"); |
| if (!res) |
| return -ENODEV; |
| |
| omap_mcpdm_dai_dma_params[0].dma_req = res->start; |
| |
| res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "up_link"); |
| if (!res) |
| return -ENODEV; |
| |
| omap_mcpdm_dai_dma_params[1].dma_req = res->start; |
| |
| res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu"); |
| if (res == NULL) |
| return -ENOMEM; |
| |
| if (!devm_request_mem_region(&pdev->dev, res->start, |
| resource_size(res), "McPDM")) |
| return -EBUSY; |
| |
| mcpdm->io_base = devm_ioremap(&pdev->dev, res->start, |
| resource_size(res)); |
| if (!mcpdm->io_base) |
| return -ENOMEM; |
| |
| mcpdm->irq = platform_get_irq(pdev, 0); |
| if (mcpdm->irq < 0) |
| return mcpdm->irq; |
| |
| mcpdm->dev = &pdev->dev; |
| |
| return snd_soc_register_dai(&pdev->dev, &omap_mcpdm_dai); |
| } |
| |
| static int asoc_mcpdm_remove(struct platform_device *pdev) |
| { |
| snd_soc_unregister_dai(&pdev->dev); |
| return 0; |
| } |
| |
| static const struct of_device_id omap_mcpdm_of_match[] = { |
| { .compatible = "ti,omap4-mcpdm", }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(of, omap_mcpdm_of_match); |
| |
| static struct platform_driver asoc_mcpdm_driver = { |
| .driver = { |
| .name = "omap-mcpdm", |
| .owner = THIS_MODULE, |
| .of_match_table = omap_mcpdm_of_match, |
| }, |
| |
| .probe = asoc_mcpdm_probe, |
| .remove = asoc_mcpdm_remove, |
| }; |
| |
| module_platform_driver(asoc_mcpdm_driver); |
| |
| MODULE_ALIAS("platform:omap-mcpdm"); |
| MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>"); |
| MODULE_DESCRIPTION("OMAP PDM SoC Interface"); |
| MODULE_LICENSE("GPL"); |