drivers/phy/marvell/phy-mvebu-sata.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs.
   4  *
   5  *      Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/clk.h>
  11 #include <linux/phy/phy.h>
  12 #include <linux/io.h>
  13 #include <linux/mod_devicetable.h>
  14 #include <linux/platform_device.h>
  15
  16 struct priv {
  17         struct clk      *clk;
  18         void __iomem    *base;
  19 };
  20
  21 #define SATA_PHY_MODE_2 0x0330
  22 #define  MODE_2_FORCE_PU_TX     BIT(0)
  23 #define  MODE_2_FORCE_PU_RX     BIT(1)
  24 #define  MODE_2_PU_PLL          BIT(2)
  25 #define  MODE_2_PU_IVREF        BIT(3)
  26 #define SATA_IF_CTRL    0x0050
  27 #define  CTRL_PHY_SHUTDOWN      BIT(9)
  28
  29 static int phy_mvebu_sata_power_on(struct phy *phy)
  30 {
  31         struct priv *priv = phy_get_drvdata(phy);
  32         u32 reg;
  33
  34         clk_prepare_enable(priv->clk);
  35
  36         /* Enable PLL and IVREF */
  37         reg = readl(priv->base + SATA_PHY_MODE_2);
  38         reg |= (MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
  39                 MODE_2_PU_PLL | MODE_2_PU_IVREF);
  40         writel(reg , priv->base + SATA_PHY_MODE_2);
  41
  42         /* Enable PHY */
  43         reg = readl(priv->base + SATA_IF_CTRL);
  44         reg &= ~CTRL_PHY_SHUTDOWN;
  45         writel(reg, priv->base + SATA_IF_CTRL);
  46
  47         clk_disable_unprepare(priv->clk);
  48
  49         return 0;
  50 }
  51
  52 static int phy_mvebu_sata_power_off(struct phy *phy)
  53 {
  54         struct priv *priv = phy_get_drvdata(phy);
  55         u32 reg;
  56
  57         clk_prepare_enable(priv->clk);
  58
  59         /* Disable PLL and IVREF */
  60         reg = readl(priv->base + SATA_PHY_MODE_2);
  61         reg &= ~(MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
  62                  MODE_2_PU_PLL | MODE_2_PU_IVREF);
  63         writel(reg, priv->base + SATA_PHY_MODE_2);
  64
  65         /* Disable PHY */
  66         reg = readl(priv->base + SATA_IF_CTRL);
  67         reg |= CTRL_PHY_SHUTDOWN;
  68         writel(reg, priv->base + SATA_IF_CTRL);
  69
  70         clk_disable_unprepare(priv->clk);
  71
  72         return 0;
  73 }
  74
  75 static const struct phy_ops phy_mvebu_sata_ops = {
  76         .power_on       = phy_mvebu_sata_power_on,
  77         .power_off      = phy_mvebu_sata_power_off,
  78         .owner          = THIS_MODULE,
  79 };
  80
  81 static int phy_mvebu_sata_probe(struct platform_device *pdev)
  82 {
  83         struct phy_provider *phy_provider;
  84         struct priv *priv;
  85         struct phy *phy;
  86
  87         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
  88         if (!priv)
  89                 return -ENOMEM;
  90
  91         priv->base = devm_platform_ioremap_resource(pdev, 0);
  92         if (IS_ERR(priv->base))
  93                 return PTR_ERR(priv->base);
  94
  95         priv->clk = devm_clk_get(&pdev->dev, "sata");
  96         if (IS_ERR(priv->clk))
  97                 return PTR_ERR(priv->clk);
  98
  99         phy = devm_phy_create(&pdev->dev, NULL, &phy_mvebu_sata_ops);
 100         if (IS_ERR(phy))
 101                 return PTR_ERR(phy);
 102
 103         phy_set_drvdata(phy, priv);
 104
 105         phy_provider = devm_of_phy_provider_register(&pdev->dev,
 106                                                      of_phy_simple_xlate);
 107         if (IS_ERR(phy_provider))
 108                 return PTR_ERR(phy_provider);
 109
 110         /* The boot loader may of left it on. Turn it off. */
 111         phy_mvebu_sata_power_off(phy);
 112
 113         return 0;
 114 }
 115
 116 static const struct of_device_id phy_mvebu_sata_of_match[] = {
 117         { .compatible = "marvell,mvebu-sata-phy" },
 118         { },
 119 };
 120
 121 static struct platform_driver phy_mvebu_sata_driver = {
 122         .probe  = phy_mvebu_sata_probe,
 123         .driver = {
 124                 .name   = "phy-mvebu-sata",
 125                 .of_match_table = phy_mvebu_sata_of_match,
 126         }
 127 };
 128 builtin_platform_driver(phy_mvebu_sata_driver);