From: "Damien.Horsley" Damien.Horsley@imgtec.com
Add driver for Imagination Technologies SPDIF output controller
Signed-off-by: Damien.Horsley Damien.Horsley@imgtec.com --- sound/soc/img/Kconfig | 8 + sound/soc/img/Makefile | 1 + sound/soc/img/img-spdif-out.c | 432 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 441 insertions(+) create mode 100644 sound/soc/img/img-spdif-out.c
diff --git a/sound/soc/img/Kconfig b/sound/soc/img/Kconfig index 161ce90..d08537e 100644 --- a/sound/soc/img/Kconfig +++ b/sound/soc/img/Kconfig @@ -34,3 +34,11 @@ config SND_SOC_IMG_SPDIF_IN help Say Y or M if you want to add support for SPDIF input driver for Imagination Technologies SPDIF input device. + +config SND_SOC_IMG_SPDIF_OUT + tristate "Imagination SPDIF Output Device Driver" + depends on SND_SOC_IMG + select SND_SOC_GENERIC_DMAENGINE_PCM + help + Say Y or M if you want to add support for SPDIF out driver for + Imagination Technologies SPDIF out device. diff --git a/sound/soc/img/Makefile b/sound/soc/img/Makefile index 85ded5e..1a44fb4 100644 --- a/sound/soc/img/Makefile +++ b/sound/soc/img/Makefile @@ -2,3 +2,4 @@ obj-$(CONFIG_SND_SOC_IMG_I2S_IN) += img-i2s-in.o obj-$(CONFIG_SND_SOC_IMG_I2S_OUT) += img-i2s-out.o obj-$(CONFIG_SND_SOC_IMG_PARALLEL_OUT) += img-parallel-out.o obj-$(CONFIG_SND_SOC_IMG_SPDIF_IN) += img-spdif-in.o +obj-$(CONFIG_SND_SOC_IMG_SPDIF_OUT) += img-spdif-out.o diff --git a/sound/soc/img/img-spdif-out.c b/sound/soc/img/img-spdif-out.c new file mode 100644 index 0000000..efddf5a --- /dev/null +++ b/sound/soc/img/img-spdif-out.c @@ -0,0 +1,432 @@ +/* + * IMG SPDIF output controller driver + * + * Copyright (C) 2015 Imagination Technologies Ltd. + * + * Author: Damien Horsley Damien.Horsley@imgtec.com + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + */ + +#include <linux/clk.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/reset.h> + +#include <sound/core.h> +#include <sound/dmaengine_pcm.h> +#include <sound/initval.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> + +#define IMG_SPDIF_OUT_TX_FIFO 0x0 + +#define IMG_SPDIF_OUT_CTL 0x4 +#define IMG_SPDIF_OUT_CTL_FS_MASK BIT(4) +#define IMG_SPDIF_OUT_CTL_CLK_MASK BIT(2) +#define IMG_SPDIF_OUT_CTL_SRT_MASK BIT(0) + +#define IMG_SPDIF_OUT_CSL 0x14 + +#define IMG_SPDIF_OUT_CSH_UV 0x18 +#define IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT 0 +#define IMG_SPDIF_OUT_CSH_UV_CSH_MASK 0xff + +struct img_spdif_out { + spinlock_t lock; + void __iomem *base; + struct clk *clk_sys; + struct clk *clk_ref; + struct snd_dmaengine_dai_dma_data dma_data; + struct device *dev; + struct reset_control *rst; +}; + +static int img_spdif_out_suspend(struct device *dev) +{ + struct img_spdif_out *spdif = dev_get_drvdata(dev); + + clk_disable_unprepare(spdif->clk_ref); + + return 0; +} + +static int img_spdif_out_resume(struct device *dev) +{ + struct img_spdif_out *spdif = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(spdif->clk_ref); + if (ret) { + dev_err(dev, "clk_enable failed: %d\n", ret); + return ret; + } + + return 0; +} + +static inline void img_spdif_out_writel(struct img_spdif_out *spdif, u32 val, + u32 reg) +{ + writel(val, spdif->base + reg); +} + +static inline u32 img_spdif_out_readl(struct img_spdif_out *spdif, u32 reg) +{ + return readl(spdif->base + reg); +} + +static void img_spdif_out_reset(struct img_spdif_out *spdif) +{ + u32 ctl, status_low, status_high; + + ctl = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL) & + ~IMG_SPDIF_OUT_CTL_SRT_MASK; + status_low = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSL); + status_high = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV); + + reset_control_assert(spdif->rst); + reset_control_deassert(spdif->rst); + + img_spdif_out_writel(spdif, ctl, IMG_SPDIF_OUT_CTL); + img_spdif_out_writel(spdif, status_low, IMG_SPDIF_OUT_CSL); + img_spdif_out_writel(spdif, status_high, IMG_SPDIF_OUT_CSH_UV); +} + +static int img_spdif_out_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; + uinfo->count = 1; + + return 0; +} + +static int img_spdif_out_get_status_mask(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + ucontrol->value.iec958.status[0] = 0xff; + ucontrol->value.iec958.status[1] = 0xff; + ucontrol->value.iec958.status[2] = 0xff; + ucontrol->value.iec958.status[3] = 0xff; + ucontrol->value.iec958.status[4] = 0xff; + + return 0; +} + +static int img_spdif_out_get_status(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); + struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(cpu_dai); + u32 reg; + unsigned long flags; + + spin_lock_irqsave(&spdif->lock, flags); + + reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSL); + ucontrol->value.iec958.status[0] = reg & 0xff; + ucontrol->value.iec958.status[1] = (reg >> 8) & 0xff; + ucontrol->value.iec958.status[2] = (reg >> 16) & 0xff; + ucontrol->value.iec958.status[3] = (reg >> 24) & 0xff; + + reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV); + ucontrol->value.iec958.status[4] = + (reg & IMG_SPDIF_OUT_CSH_UV_CSH_MASK) >> + IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT; + + spin_unlock_irqrestore(&spdif->lock, flags); + + return 0; +} + +static int img_spdif_out_set_status(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); + struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(cpu_dai); + u32 reg; + unsigned long flags; + + reg = ((u32)ucontrol->value.iec958.status[3] << 24); + reg |= ((u32)ucontrol->value.iec958.status[2] << 16); + reg |= ((u32)ucontrol->value.iec958.status[1] << 8); + reg |= (u32)ucontrol->value.iec958.status[0]; + + spin_lock_irqsave(&spdif->lock, flags); + + img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CSL); + + reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV); + reg &= ~IMG_SPDIF_OUT_CSH_UV_CSH_MASK; + reg |= (u32)ucontrol->value.iec958.status[4] << + IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT; + img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CSH_UV); + + spin_unlock_irqrestore(&spdif->lock, flags); + + return 0; +} + +static struct snd_kcontrol_new img_spdif_out_controls[] = { + { + .access = SNDRV_CTL_ELEM_ACCESS_READ, + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK), + .info = img_spdif_out_info, + .get = img_spdif_out_get_status_mask + }, + { + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT), + .info = img_spdif_out_info, + .get = img_spdif_out_get_status, + .put = img_spdif_out_set_status + } +}; + +static int img_spdif_out_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *dai) +{ + struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai); + u32 reg; + unsigned long flags; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL); + reg |= IMG_SPDIF_OUT_CTL_SRT_MASK; + img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CTL); + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + spin_lock_irqsave(&spdif->lock, flags); + img_spdif_out_reset(spdif); + spin_unlock_irqrestore(&spdif->lock, flags); + break; + default: + return -EINVAL; + } + + return 0; +} + +static int img_spdif_out_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) +{ + struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai); + unsigned int format, channels; + long pre_div_a, pre_div_b, diff_a, diff_b, rate, clk_rate; + u32 reg; + + rate = params_rate(params); + format = params_format(params); + channels = params_channels(params); + + dev_dbg(spdif->dev, "hw_params rate %ld channels %u format %u\n", + rate, channels, format); + + if (format != SNDRV_PCM_FORMAT_S32_LE) + return -EINVAL; + + if (channels != 2) + return -EINVAL; + + pre_div_a = clk_round_rate(spdif->clk_ref, rate * 256); + if (pre_div_a < 0) + return pre_div_a; + pre_div_b = clk_round_rate(spdif->clk_ref, rate * 384); + if (pre_div_b < 0) + return pre_div_b; + + diff_a = abs((pre_div_a / 256) - rate); + diff_b = abs((pre_div_b / 384) - rate); + + /* If diffs are equal, use lower clock rate */ + if (diff_a > diff_b) + clk_set_rate(spdif->clk_ref, pre_div_b); + else + clk_set_rate(spdif->clk_ref, pre_div_a); + + /* + * Another driver (eg machine driver) may have rejected the above + * change. Get the current rate and set the register bit according to + * the new min diff + */ + clk_rate = clk_get_rate(spdif->clk_ref); + + diff_a = abs((clk_rate / 256) - rate); + diff_b = abs((clk_rate / 384) - rate); + + reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL); + if (diff_a <= diff_b) + reg &= ~IMG_SPDIF_OUT_CTL_CLK_MASK; + else + reg |= IMG_SPDIF_OUT_CTL_CLK_MASK; + img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CTL); + + return 0; +} + +static const struct snd_soc_dai_ops img_spdif_out_dai_ops = { + .trigger = img_spdif_out_trigger, + .hw_params = img_spdif_out_hw_params +}; + +static int img_spdif_out_dai_probe(struct snd_soc_dai *dai) +{ + struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai); + + snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL); + + snd_soc_add_dai_controls(dai, img_spdif_out_controls, + ARRAY_SIZE(img_spdif_out_controls)); + + return 0; +} + +static struct snd_soc_dai_driver img_spdif_out_dai = { + .probe = img_spdif_out_dai_probe, + .playback = { + .channels_min = 2, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_8000_192000, + .formats = SNDRV_PCM_FMTBIT_S32_LE + }, + .ops = &img_spdif_out_dai_ops +}; + +static const struct snd_soc_component_driver img_spdif_out_component = { + .name = "img-spdif-out" +}; + +static int img_spdif_out_probe(struct platform_device *pdev) +{ + struct img_spdif_out *spdif; + struct resource *res; + void __iomem *base; + int ret; + + spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL); + if (!spdif) + return -ENOMEM; + + platform_set_drvdata(pdev, spdif); + + spdif->dev = &pdev->dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + spdif->base = base; + + spdif->rst = devm_reset_control_get(&pdev->dev, "rst"); + if (IS_ERR(spdif->rst)) { + dev_err(&pdev->dev, "No top level reset found\n"); + return PTR_ERR(spdif->rst); + } + + spdif->clk_sys = devm_clk_get(&pdev->dev, "sys"); + if (IS_ERR(spdif->clk_sys)) + return PTR_ERR(spdif->clk_sys); + + spdif->clk_ref = devm_clk_get(&pdev->dev, "ref"); + if (IS_ERR(spdif->clk_ref)) + return PTR_ERR(spdif->clk_ref); + + ret = clk_prepare_enable(spdif->clk_sys); + if (ret) + return ret; + + img_spdif_out_writel(spdif, IMG_SPDIF_OUT_CTL_FS_MASK, + IMG_SPDIF_OUT_CTL); + + img_spdif_out_reset(spdif); + + pm_runtime_enable(&pdev->dev); + if (!pm_runtime_enabled(&pdev->dev)) { + ret = img_spdif_out_resume(&pdev->dev); + if (ret) + goto err_pm_disable; + } + + spin_lock_init(&spdif->lock); + + spdif->dma_data.addr = res->start + IMG_SPDIF_OUT_TX_FIFO; + spdif->dma_data.addr_width = 4; + spdif->dma_data.maxburst = 4; + + ret = devm_snd_soc_register_component(&pdev->dev, + &img_spdif_out_component, + &img_spdif_out_dai, 1); + if (ret) + goto err_suspend; + + ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); + if (ret) + goto err_suspend; + + dev_dbg(&pdev->dev, "Probe successful\n"); + + return 0; + +err_suspend: + if (!pm_runtime_status_suspended(&pdev->dev)) + img_spdif_out_suspend(&pdev->dev); +err_pm_disable: + pm_runtime_disable(&pdev->dev); + clk_disable_unprepare(spdif->clk_sys); + + return ret; +} + +static int img_spdif_out_dev_remove(struct platform_device *pdev) +{ + struct img_spdif_out *spdif = platform_get_drvdata(pdev); + + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + img_spdif_out_suspend(&pdev->dev); + + clk_disable_unprepare(spdif->clk_sys); + + return 0; +} + +static const struct of_device_id img_spdif_out_of_match[] = { + { .compatible = "img,spdif-out" }, + {} +}; +MODULE_DEVICE_TABLE(of, img_spdif_out_of_match); + +static const struct dev_pm_ops img_spdif_out_pm_ops = { + SET_RUNTIME_PM_OPS(img_spdif_out_suspend, + img_spdif_out_resume, NULL) +}; + +static struct platform_driver img_spdif_out_driver = { + .driver = { + .name = "img-spdif-out", + .of_match_table = img_spdif_out_of_match, + .pm = &img_spdif_out_pm_ops + }, + .probe = img_spdif_out_probe, + .remove = img_spdif_out_dev_remove +}; +module_platform_driver(img_spdif_out_driver); + +MODULE_AUTHOR("Damien Horsley Damien.Horsley@imgtec.com"); +MODULE_DESCRIPTION("IMG SPDIF Output driver"); +MODULE_LICENSE("GPL v2");