projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 74988e8b JH |
1 | /* |
| 2 | * Samsung EXYNOS SoC series Display Port PHY driver | |
| 3 | * | |
| 4 | * Copyright (C) 2013 Samsung Electronics Co., Ltd. | |
| 5 | * Author: Jingoo Han <jg1.han@samsung.com> | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/io.h> | |
| 13 | #include <linux/kernel.h> | |
| 14 | #include <linux/module.h> | |
| 15 | #include <linux/of.h> | |
| 16 | #include <linux/of_address.h> | |
| 17 | #include <linux/phy/phy.h> | |
| 18 | #include <linux/platform_device.h> | |
| 19 | ||
| 20 | /* DPTX_PHY_CONTROL register */ | |
| 21 | #define EXYNOS_DPTX_PHY_ENABLE (1 << 0) | |
| 22 | ||
| 23 | struct exynos_dp_video_phy { | |
| 24 | void __iomem *regs; | |
| 25 | }; | |
| 26 | ||
| 27 | static int __set_phy_state(struct exynos_dp_video_phy *state, unsigned int on) | |
| 28 | { | |
| 29 | u32 reg; | |
| 30 | ||
| 31 | reg = readl(state->regs); | |
| 32 | if (on) | |
| 33 | reg |= EXYNOS_DPTX_PHY_ENABLE; | |
| 34 | else | |
| 35 | reg &= ~EXYNOS_DPTX_PHY_ENABLE; | |
| 36 | writel(reg, state->regs); | |
| 37 | ||
| 38 | return 0; | |
| 39 | } | |
| 40 | ||
| 41 | static int exynos_dp_video_phy_power_on(struct phy *phy) | |
| 42 | { | |
| 43 | struct exynos_dp_video_phy *state = phy_get_drvdata(phy); | |
| 44 | ||
| 45 | return __set_phy_state(state, 1); | |
| 46 | } | |
| 47 | ||
| 48 | static int exynos_dp_video_phy_power_off(struct phy *phy) | |
| 49 | { | |
| 50 | struct exynos_dp_video_phy *state = phy_get_drvdata(phy); | |
| 51 | ||
| 52 | return __set_phy_state(state, 0); | |
| 53 | } | |
| 54 | ||
| 55 | static struct phy_ops exynos_dp_video_phy_ops = { | |
| 56 | .power_on = exynos_dp_video_phy_power_on, | |
| 57 | .power_off = exynos_dp_video_phy_power_off, | |
| 58 | .owner = THIS_MODULE, | |
| 59 | }; | |
| 60 | ||
| 61 | static int exynos_dp_video_phy_probe(struct platform_device *pdev) | |
| 62 | { | |
| 63 | struct exynos_dp_video_phy *state; | |
| 64 | struct device *dev = &pdev->dev; | |
| 65 | struct resource *res; | |
| 66 | struct phy_provider *phy_provider; | |
| 67 | struct phy *phy; | |
| 68 | ||
| 69 | state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL); | |
| 70 | if (!state) | |
| 71 | return -ENOMEM; | |
| 72 | ||
| 73 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 74 | ||
| 75 | state->regs = devm_ioremap_resource(dev, res); | |
| 76 | if (IS_ERR(state->regs)) | |
| 77 | return PTR_ERR(state->regs); | |
| 78 | ||
| 79 | phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); | |
| 80 | if (IS_ERR(phy_provider)) | |
| 81 | return PTR_ERR(phy_provider); | |
| 82 | ||
| 83 | phy = devm_phy_create(dev, &exynos_dp_video_phy_ops, NULL); | |
| 84 | if (IS_ERR(phy)) { | |
| 85 | dev_err(dev, "failed to create Display Port PHY\n"); | |
| 86 | return PTR_ERR(phy); | |
| 87 | } | |
| 88 | phy_set_drvdata(phy, state); | |
| 89 | ||
| 90 | return 0; | |
| 91 | } | |
| 92 | ||
| 93 | static const struct of_device_id exynos_dp_video_phy_of_match[] = { | |
| 94 | { .compatible = "samsung,exynos5250-dp-video-phy" }, | |
| 95 | { }, | |
| 96 | }; | |
| 97 | MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match); | |
| 98 | ||
| 99 | static struct platform_driver exynos_dp_video_phy_driver = { | |
| 100 | .probe = exynos_dp_video_phy_probe, | |
| 101 | .driver = { | |
| 102 | .name = "exynos-dp-video-phy", | |
| 103 | .owner = THIS_MODULE, | |
| 104 | .of_match_table = exynos_dp_video_phy_of_match, | |
| 105 | } | |
| 106 | }; | |
| 107 | module_platform_driver(exynos_dp_video_phy_driver); | |
| 108 | ||
| 109 | MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); | |
| 110 | MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver"); | |
| 111 | MODULE_LICENSE("GPL v2"); |