| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * IMG parallel output controller driver |
| * |
| * Copyright (C) 2015 Imagination Technologies Ltd. |
| * |
| * Author: Damien Horsley <Damien.Horsley@imgtec.com> |
| */ |
| |
| #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_PRL_OUT_TX_FIFO 0 |
| |
| #define IMG_PRL_OUT_CTL 0x4 |
| #define IMG_PRL_OUT_CTL_CH_MASK BIT(4) |
| #define IMG_PRL_OUT_CTL_PACKH_MASK BIT(3) |
| #define IMG_PRL_OUT_CTL_EDGE_MASK BIT(2) |
| #define IMG_PRL_OUT_CTL_ME_MASK BIT(1) |
| #define IMG_PRL_OUT_CTL_SRST_MASK BIT(0) |
| |
| struct img_prl_out { |
| 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_prl_out_suspend(struct device *dev) |
| { |
| struct img_prl_out *prl = dev_get_drvdata(dev); |
| |
| clk_disable_unprepare(prl->clk_ref); |
| |
| return 0; |
| } |
| |
| static int img_prl_out_resume(struct device *dev) |
| { |
| struct img_prl_out *prl = dev_get_drvdata(dev); |
| int ret; |
| |
| ret = clk_prepare_enable(prl->clk_ref); |
| if (ret) { |
| dev_err(dev, "clk_enable failed: %d\n", ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static inline void img_prl_out_writel(struct img_prl_out *prl, |
| u32 val, u32 reg) |
| { |
| writel(val, prl->base + reg); |
| } |
| |
| static inline u32 img_prl_out_readl(struct img_prl_out *prl, u32 reg) |
| { |
| return readl(prl->base + reg); |
| } |
| |
| static void img_prl_out_reset(struct img_prl_out *prl) |
| { |
| u32 ctl; |
| |
| ctl = img_prl_out_readl(prl, IMG_PRL_OUT_CTL) & |
| ~IMG_PRL_OUT_CTL_ME_MASK; |
| |
| reset_control_assert(prl->rst); |
| reset_control_deassert(prl->rst); |
| |
| img_prl_out_writel(prl, ctl, IMG_PRL_OUT_CTL); |
| } |
| |
| static int img_prl_out_trigger(struct snd_pcm_substream *substream, int cmd, |
| struct snd_soc_dai *dai) |
| { |
| struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai); |
| u32 reg; |
| |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_START: |
| case SNDRV_PCM_TRIGGER_RESUME: |
| case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL); |
| reg |= IMG_PRL_OUT_CTL_ME_MASK; |
| img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL); |
| break; |
| case SNDRV_PCM_TRIGGER_STOP: |
| case SNDRV_PCM_TRIGGER_SUSPEND: |
| case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| img_prl_out_reset(prl); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int img_prl_out_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) |
| { |
| struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai); |
| unsigned int rate, channels; |
| u32 reg, control_set = 0; |
| |
| rate = params_rate(params); |
| channels = params_channels(params); |
| |
| switch (params_format(params)) { |
| case SNDRV_PCM_FORMAT_S32_LE: |
| control_set |= IMG_PRL_OUT_CTL_PACKH_MASK; |
| break; |
| case SNDRV_PCM_FORMAT_S24_LE: |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| if (channels != 2) |
| return -EINVAL; |
| |
| clk_set_rate(prl->clk_ref, rate * 256); |
| |
| reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL); |
| reg = (reg & ~IMG_PRL_OUT_CTL_PACKH_MASK) | control_set; |
| img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL); |
| |
| return 0; |
| } |
| |
| static int img_prl_out_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) |
| { |
| struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai); |
| u32 reg, control_set = 0; |
| int ret; |
| |
| switch (fmt & SND_SOC_DAIFMT_INV_MASK) { |
| case SND_SOC_DAIFMT_NB_NF: |
| break; |
| case SND_SOC_DAIFMT_NB_IF: |
| control_set |= IMG_PRL_OUT_CTL_EDGE_MASK; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| ret = pm_runtime_resume_and_get(prl->dev); |
| if (ret < 0) |
| return ret; |
| |
| reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL); |
| reg = (reg & ~IMG_PRL_OUT_CTL_EDGE_MASK) | control_set; |
| img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL); |
| pm_runtime_put(prl->dev); |
| |
| return 0; |
| } |
| |
| static const struct snd_soc_dai_ops img_prl_out_dai_ops = { |
| .trigger = img_prl_out_trigger, |
| .hw_params = img_prl_out_hw_params, |
| .set_fmt = img_prl_out_set_fmt |
| }; |
| |
| static int img_prl_out_dai_probe(struct snd_soc_dai *dai) |
| { |
| struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai); |
| |
| snd_soc_dai_init_dma_data(dai, &prl->dma_data, NULL); |
| |
| return 0; |
| } |
| |
| static struct snd_soc_dai_driver img_prl_out_dai = { |
| .probe = img_prl_out_dai_probe, |
| .playback = { |
| .channels_min = 2, |
| .channels_max = 2, |
| .rates = SNDRV_PCM_RATE_8000_192000, |
| .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S24_LE |
| }, |
| .ops = &img_prl_out_dai_ops |
| }; |
| |
| static const struct snd_soc_component_driver img_prl_out_component = { |
| .name = "img-prl-out", |
| .legacy_dai_naming = 1, |
| }; |
| |
| static int img_prl_out_probe(struct platform_device *pdev) |
| { |
| struct img_prl_out *prl; |
| struct resource *res; |
| void __iomem *base; |
| int ret; |
| struct device *dev = &pdev->dev; |
| |
| prl = devm_kzalloc(&pdev->dev, sizeof(*prl), GFP_KERNEL); |
| if (!prl) |
| return -ENOMEM; |
| |
| platform_set_drvdata(pdev, prl); |
| |
| prl->dev = &pdev->dev; |
| |
| base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); |
| if (IS_ERR(base)) |
| return PTR_ERR(base); |
| |
| prl->base = base; |
| |
| prl->rst = devm_reset_control_get_exclusive(&pdev->dev, "rst"); |
| if (IS_ERR(prl->rst)) |
| return dev_err_probe(&pdev->dev, PTR_ERR(prl->rst), |
| "No top level reset found\n"); |
| |
| prl->clk_sys = devm_clk_get(&pdev->dev, "sys"); |
| if (IS_ERR(prl->clk_sys)) |
| return dev_err_probe(dev, PTR_ERR(prl->clk_sys), |
| "Failed to acquire clock 'sys'\n"); |
| |
| prl->clk_ref = devm_clk_get(&pdev->dev, "ref"); |
| if (IS_ERR(prl->clk_ref)) |
| return dev_err_probe(dev, PTR_ERR(prl->clk_ref), |
| "Failed to acquire clock 'ref'\n"); |
| |
| ret = clk_prepare_enable(prl->clk_sys); |
| if (ret) |
| return ret; |
| |
| img_prl_out_writel(prl, IMG_PRL_OUT_CTL_EDGE_MASK, IMG_PRL_OUT_CTL); |
| img_prl_out_reset(prl); |
| |
| pm_runtime_enable(&pdev->dev); |
| if (!pm_runtime_enabled(&pdev->dev)) { |
| ret = img_prl_out_resume(&pdev->dev); |
| if (ret) |
| goto err_pm_disable; |
| } |
| |
| prl->dma_data.addr = res->start + IMG_PRL_OUT_TX_FIFO; |
| prl->dma_data.addr_width = 4; |
| prl->dma_data.maxburst = 4; |
| |
| ret = devm_snd_soc_register_component(&pdev->dev, |
| &img_prl_out_component, |
| &img_prl_out_dai, 1); |
| if (ret) |
| goto err_suspend; |
| |
| ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); |
| if (ret) |
| goto err_suspend; |
| |
| return 0; |
| |
| err_suspend: |
| if (!pm_runtime_status_suspended(&pdev->dev)) |
| img_prl_out_suspend(&pdev->dev); |
| err_pm_disable: |
| pm_runtime_disable(&pdev->dev); |
| clk_disable_unprepare(prl->clk_sys); |
| |
| return ret; |
| } |
| |
| static void img_prl_out_dev_remove(struct platform_device *pdev) |
| { |
| struct img_prl_out *prl = platform_get_drvdata(pdev); |
| |
| pm_runtime_disable(&pdev->dev); |
| if (!pm_runtime_status_suspended(&pdev->dev)) |
| img_prl_out_suspend(&pdev->dev); |
| |
| clk_disable_unprepare(prl->clk_sys); |
| } |
| |
| static const struct of_device_id img_prl_out_of_match[] = { |
| { .compatible = "img,parallel-out" }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(of, img_prl_out_of_match); |
| |
| static const struct dev_pm_ops img_prl_out_pm_ops = { |
| SET_RUNTIME_PM_OPS(img_prl_out_suspend, |
| img_prl_out_resume, NULL) |
| }; |
| |
| static struct platform_driver img_prl_out_driver = { |
| .driver = { |
| .name = "img-parallel-out", |
| .of_match_table = img_prl_out_of_match, |
| .pm = &img_prl_out_pm_ops |
| }, |
| .probe = img_prl_out_probe, |
| .remove_new = img_prl_out_dev_remove |
| }; |
| module_platform_driver(img_prl_out_driver); |
| |
| MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>"); |
| MODULE_DESCRIPTION("IMG Parallel Output Driver"); |
| MODULE_LICENSE("GPL v2"); |