diff options
Diffstat (limited to 'drivers/gpu/drm/msm/hdmi/hdmi_phy.c')
| -rw-r--r-- | drivers/gpu/drm/msm/hdmi/hdmi_phy.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_phy.c b/drivers/gpu/drm/msm/hdmi/hdmi_phy.c new file mode 100644 index 000000000..534ce5b49 --- /dev/null +++ b/drivers/gpu/drm/msm/hdmi/hdmi_phy.c @@ -0,0 +1,230 @@ +/* + * Copyright (c) 2016, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only 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. + */ + +#include <linux/of_device.h> + +#include "hdmi.h" + +static int msm_hdmi_phy_resource_init(struct hdmi_phy *phy) +{ + struct hdmi_phy_cfg *cfg = phy->cfg; + struct device *dev = &phy->pdev->dev; + int i, ret; + + phy->regs = devm_kzalloc(dev, sizeof(phy->regs[0]) * cfg->num_regs, + GFP_KERNEL); + if (!phy->regs) + return -ENOMEM; + + phy->clks = devm_kzalloc(dev, sizeof(phy->clks[0]) * cfg->num_clks, + GFP_KERNEL); + if (!phy->clks) + return -ENOMEM; + + for (i = 0; i < cfg->num_regs; i++) { + struct regulator *reg; + + reg = devm_regulator_get(dev, cfg->reg_names[i]); + if (IS_ERR(reg)) { + ret = PTR_ERR(reg); + dev_err(dev, "failed to get phy regulator: %s (%d)\n", + cfg->reg_names[i], ret); + return ret; + } + + phy->regs[i] = reg; + } + + for (i = 0; i < cfg->num_clks; i++) { + struct clk *clk; + + clk = devm_clk_get(dev, cfg->clk_names[i]); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + dev_err(dev, "failed to get phy clock: %s (%d)\n", + cfg->clk_names[i], ret); + return ret; + } + + phy->clks[i] = clk; + } + + return 0; +} + +int msm_hdmi_phy_resource_enable(struct hdmi_phy *phy) +{ + struct hdmi_phy_cfg *cfg = phy->cfg; + struct device *dev = &phy->pdev->dev; + int i, ret = 0; + + pm_runtime_get_sync(dev); + + for (i = 0; i < cfg->num_regs; i++) { + ret = regulator_enable(phy->regs[i]); + if (ret) + dev_err(dev, "failed to enable regulator: %s (%d)\n", + cfg->reg_names[i], ret); + } + + for (i = 0; i < cfg->num_clks; i++) { + ret = clk_prepare_enable(phy->clks[i]); + if (ret) + dev_err(dev, "failed to enable clock: %s (%d)\n", + cfg->clk_names[i], ret); + } + + return ret; +} + +void msm_hdmi_phy_resource_disable(struct hdmi_phy *phy) +{ + struct hdmi_phy_cfg *cfg = phy->cfg; + struct device *dev = &phy->pdev->dev; + int i; + + for (i = cfg->num_clks - 1; i >= 0; i--) + clk_disable_unprepare(phy->clks[i]); + + for (i = cfg->num_regs - 1; i >= 0; i--) + regulator_disable(phy->regs[i]); + + pm_runtime_put_sync(dev); +} + +void msm_hdmi_phy_powerup(struct hdmi_phy *phy, unsigned long int pixclock) +{ + if (!phy || !phy->cfg->powerup) + return; + + phy->cfg->powerup(phy, pixclock); +} + +void msm_hdmi_phy_powerdown(struct hdmi_phy *phy) +{ + if (!phy || !phy->cfg->powerdown) + return; + + phy->cfg->powerdown(phy); +} + +static int msm_hdmi_phy_pll_init(struct platform_device *pdev, + enum hdmi_phy_type type) +{ + int ret; + + switch (type) { + case MSM_HDMI_PHY_8960: + ret = msm_hdmi_pll_8960_init(pdev); + break; + case MSM_HDMI_PHY_8996: + ret = msm_hdmi_pll_8996_init(pdev); + break; + /* + * we don't have PLL support for these, don't report an error for now + */ + case MSM_HDMI_PHY_8x60: + case MSM_HDMI_PHY_8x74: + default: + ret = 0; + break; + } + + return ret; +} + +static int msm_hdmi_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct hdmi_phy *phy; + int ret; + + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); + if (!phy) + return -ENODEV; + + phy->cfg = (struct hdmi_phy_cfg *)of_device_get_match_data(dev); + if (!phy->cfg) + return -ENODEV; + + phy->mmio = msm_ioremap(pdev, "hdmi_phy", "HDMI_PHY"); + if (IS_ERR(phy->mmio)) { + dev_err(dev, "%s: failed to map phy base\n", __func__); + return -ENOMEM; + } + + phy->pdev = pdev; + + ret = msm_hdmi_phy_resource_init(phy); + if (ret) + return ret; + + pm_runtime_enable(&pdev->dev); + + ret = msm_hdmi_phy_resource_enable(phy); + if (ret) + return ret; + + ret = msm_hdmi_phy_pll_init(pdev, phy->cfg->type); + if (ret) { + dev_err(dev, "couldn't init PLL\n"); + msm_hdmi_phy_resource_disable(phy); + return ret; + } + + msm_hdmi_phy_resource_disable(phy); + + platform_set_drvdata(pdev, phy); + + return 0; +} + +static int msm_hdmi_phy_remove(struct platform_device *pdev) +{ + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static const struct of_device_id msm_hdmi_phy_dt_match[] = { + { .compatible = "qcom,hdmi-phy-8660", + .data = &msm_hdmi_phy_8x60_cfg }, + { .compatible = "qcom,hdmi-phy-8960", + .data = &msm_hdmi_phy_8960_cfg }, + { .compatible = "qcom,hdmi-phy-8974", + .data = &msm_hdmi_phy_8x74_cfg }, + { .compatible = "qcom,hdmi-phy-8084", + .data = &msm_hdmi_phy_8x74_cfg }, + { .compatible = "qcom,hdmi-phy-8996", + .data = &msm_hdmi_phy_8996_cfg }, + {} +}; + +static struct platform_driver msm_hdmi_phy_platform_driver = { + .probe = msm_hdmi_phy_probe, + .remove = msm_hdmi_phy_remove, + .driver = { + .name = "msm_hdmi_phy", + .of_match_table = msm_hdmi_phy_dt_match, + }, +}; + +void __init msm_hdmi_phy_driver_register(void) +{ + platform_driver_register(&msm_hdmi_phy_platform_driver); +} + +void __exit msm_hdmi_phy_driver_unregister(void) +{ + platform_driver_unregister(&msm_hdmi_phy_platform_driver); +} |