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