Andrew Lunn | e3eae85 | 2013-12-17 21:21:50 +0100 | [diff] [blame] | 1 | /* |
| 2 | * phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs. |
| 3 | * |
| 4 | * Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/clk.h> |
| 15 | #include <linux/phy/phy.h> |
| 16 | #include <linux/io.h> |
| 17 | #include <linux/platform_device.h> |
| 18 | |
| 19 | struct priv { |
| 20 | struct clk *clk; |
| 21 | void __iomem *base; |
| 22 | }; |
| 23 | |
| 24 | #define SATA_PHY_MODE_2 0x0330 |
| 25 | #define MODE_2_FORCE_PU_TX BIT(0) |
| 26 | #define MODE_2_FORCE_PU_RX BIT(1) |
| 27 | #define MODE_2_PU_PLL BIT(2) |
| 28 | #define MODE_2_PU_IVREF BIT(3) |
| 29 | #define SATA_IF_CTRL 0x0050 |
| 30 | #define CTRL_PHY_SHUTDOWN BIT(9) |
| 31 | |
| 32 | static int phy_mvebu_sata_power_on(struct phy *phy) |
| 33 | { |
| 34 | struct priv *priv = phy_get_drvdata(phy); |
| 35 | u32 reg; |
| 36 | |
| 37 | clk_prepare_enable(priv->clk); |
| 38 | |
| 39 | /* Enable PLL and IVREF */ |
| 40 | reg = readl(priv->base + SATA_PHY_MODE_2); |
| 41 | reg |= (MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX | |
| 42 | MODE_2_PU_PLL | MODE_2_PU_IVREF); |
| 43 | writel(reg , priv->base + SATA_PHY_MODE_2); |
| 44 | |
| 45 | /* Enable PHY */ |
| 46 | reg = readl(priv->base + SATA_IF_CTRL); |
| 47 | reg &= ~CTRL_PHY_SHUTDOWN; |
| 48 | writel(reg, priv->base + SATA_IF_CTRL); |
| 49 | |
| 50 | clk_disable_unprepare(priv->clk); |
| 51 | |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | static int phy_mvebu_sata_power_off(struct phy *phy) |
| 56 | { |
| 57 | struct priv *priv = phy_get_drvdata(phy); |
| 58 | u32 reg; |
| 59 | |
| 60 | clk_prepare_enable(priv->clk); |
| 61 | |
| 62 | /* Disable PLL and IVREF */ |
| 63 | reg = readl(priv->base + SATA_PHY_MODE_2); |
| 64 | reg &= ~(MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX | |
| 65 | MODE_2_PU_PLL | MODE_2_PU_IVREF); |
| 66 | writel(reg, priv->base + SATA_PHY_MODE_2); |
| 67 | |
| 68 | /* Disable PHY */ |
| 69 | reg = readl(priv->base + SATA_IF_CTRL); |
| 70 | reg |= CTRL_PHY_SHUTDOWN; |
| 71 | writel(reg, priv->base + SATA_IF_CTRL); |
| 72 | |
| 73 | clk_disable_unprepare(priv->clk); |
| 74 | |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | static struct phy_ops phy_mvebu_sata_ops = { |
| 79 | .power_on = phy_mvebu_sata_power_on, |
| 80 | .power_off = phy_mvebu_sata_power_off, |
| 81 | .owner = THIS_MODULE, |
| 82 | }; |
| 83 | |
| 84 | static int phy_mvebu_sata_probe(struct platform_device *pdev) |
| 85 | { |
| 86 | struct phy_provider *phy_provider; |
| 87 | struct resource *res; |
| 88 | struct priv *priv; |
| 89 | struct phy *phy; |
| 90 | |
| 91 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
Peter Griffin | 1f8de84 | 2014-08-15 13:40:09 +0100 | [diff] [blame] | 92 | if (!priv) |
| 93 | return -ENOMEM; |
Andrew Lunn | e3eae85 | 2013-12-17 21:21:50 +0100 | [diff] [blame] | 94 | |
| 95 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 96 | priv->base = devm_ioremap_resource(&pdev->dev, res); |
| 97 | if (IS_ERR(priv->base)) |
| 98 | return PTR_ERR(priv->base); |
| 99 | |
| 100 | priv->clk = devm_clk_get(&pdev->dev, "sata"); |
| 101 | if (IS_ERR(priv->clk)) |
| 102 | return PTR_ERR(priv->clk); |
| 103 | |
Heikki Krogerus | dbc9863 | 2014-11-19 17:28:21 +0200 | [diff] [blame] | 104 | phy = devm_phy_create(&pdev->dev, NULL, &phy_mvebu_sata_ops); |
Andrew Lunn | e3eae85 | 2013-12-17 21:21:50 +0100 | [diff] [blame] | 105 | if (IS_ERR(phy)) |
| 106 | return PTR_ERR(phy); |
| 107 | |
| 108 | phy_set_drvdata(phy, priv); |
| 109 | |
Kishon Vijay Abraham I | 64fe189 | 2014-02-17 14:29:25 +0530 | [diff] [blame] | 110 | phy_provider = devm_of_phy_provider_register(&pdev->dev, |
| 111 | of_phy_simple_xlate); |
| 112 | if (IS_ERR(phy_provider)) |
| 113 | return PTR_ERR(phy_provider); |
| 114 | |
Andrew Lunn | e3eae85 | 2013-12-17 21:21:50 +0100 | [diff] [blame] | 115 | /* The boot loader may of left it on. Turn it off. */ |
| 116 | phy_mvebu_sata_power_off(phy); |
| 117 | |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | static const struct of_device_id phy_mvebu_sata_of_match[] = { |
| 122 | { .compatible = "marvell,mvebu-sata-phy" }, |
| 123 | { }, |
| 124 | }; |
| 125 | MODULE_DEVICE_TABLE(of, phy_mvebu_sata_of_match); |
| 126 | |
| 127 | static struct platform_driver phy_mvebu_sata_driver = { |
| 128 | .probe = phy_mvebu_sata_probe, |
| 129 | .driver = { |
| 130 | .name = "phy-mvebu-sata", |
Andrew Lunn | e3eae85 | 2013-12-17 21:21:50 +0100 | [diff] [blame] | 131 | .of_match_table = phy_mvebu_sata_of_match, |
| 132 | } |
| 133 | }; |
| 134 | module_platform_driver(phy_mvebu_sata_driver); |
| 135 | |
| 136 | MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>"); |
| 137 | MODULE_DESCRIPTION("Marvell MVEBU SATA PHY driver"); |
| 138 | MODULE_LICENSE("GPL v2"); |