drivers/phy/phy-hix5hd2-sata.c

   1 /*
   2  * Copyright (c) 2014 Linaro Ltd.
   3  * Copyright (c) 2014 Hisilicon Limited.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/io.h>
  13 #include <linux/mfd/syscon.h>
  14 #include <linux/module.h>
  15 #include <linux/phy/phy.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/regmap.h>
  18
  19 #define SATA_PHY0_CTLL          0xa0
  20 #define MPLL_MULTIPLIER_SHIFT   1
  21 #define MPLL_MULTIPLIER_MASK    0xfe
  22 #define MPLL_MULTIPLIER_50M     0x3c
  23 #define MPLL_MULTIPLIER_100M    0x1e
  24 #define PHY_RESET               BIT(0)
  25 #define REF_SSP_EN              BIT(9)
  26 #define SSC_EN                  BIT(10)
  27 #define REF_USE_PAD             BIT(23)
  28
  29 #define SATA_PORT_PHYCTL        0x174
  30 #define SPEED_MODE_MASK         0x6f0000
  31 #define HALF_RATE_SHIFT         16
  32 #define PHY_CONFIG_SHIFT        18
  33 #define GEN2_EN_SHIFT           21
  34 #define SPEED_CTRL              BIT(20)
  35
  36 #define SATA_PORT_PHYCTL1       0x148
  37 #define AMPLITUDE_MASK          0x3ffffe
  38 #define AMPLITUDE_GEN3          0x68
  39 #define AMPLITUDE_GEN3_SHIFT    15
  40 #define AMPLITUDE_GEN2          0x56
  41 #define AMPLITUDE_GEN2_SHIFT    8
  42 #define AMPLITUDE_GEN1          0x56
  43 #define AMPLITUDE_GEN1_SHIFT    1
  44
  45 #define SATA_PORT_PHYCTL2       0x14c
  46 #define PREEMPH_MASK            0x3ffff
  47 #define PREEMPH_GEN3            0x20
  48 #define PREEMPH_GEN3_SHIFT      12
  49 #define PREEMPH_GEN2            0x15
  50 #define PREEMPH_GEN2_SHIFT      6
  51 #define PREEMPH_GEN1            0x5
  52 #define PREEMPH_GEN1_SHIFT      0
  53
  54 struct hix5hd2_priv {
  55         void __iomem    *base;
  56         struct regmap   *peri_ctrl;
  57 };
  58
  59 enum phy_speed_mode {
  60         SPEED_MODE_GEN1 = 0,
  61         SPEED_MODE_GEN2 = 1,
  62         SPEED_MODE_GEN3 = 2,
  63 };
  64
  65 static int hix5hd2_sata_phy_init(struct phy *phy)
  66 {
  67         struct hix5hd2_priv *priv = phy_get_drvdata(phy);
  68         u32 val, data[2];
  69         int ret;
  70
  71         if (priv->peri_ctrl) {
  72                 ret = of_property_read_u32_array(phy->dev.of_node,
  73                                                  "hisilicon,power-reg",
  74                                                  &data[0], 2);
  75                 if (ret) {
  76                         dev_err(&phy->dev, "Fail read hisilicon,power-reg\n");
  77                         return ret;
  78                 }
  79
  80                 regmap_update_bits(priv->peri_ctrl, data[0],
  81                                    BIT(data[1]), BIT(data[1]));
  82         }
  83
  84         /* reset phy */
  85         val = readl_relaxed(priv->base + SATA_PHY0_CTLL);
  86         val &= ~(MPLL_MULTIPLIER_MASK | REF_USE_PAD);
  87         val |= MPLL_MULTIPLIER_50M << MPLL_MULTIPLIER_SHIFT |
  88                REF_SSP_EN | PHY_RESET;
  89         writel_relaxed(val, priv->base + SATA_PHY0_CTLL);
  90         msleep(20);
  91         val &= ~PHY_RESET;
  92         writel_relaxed(val, priv->base + SATA_PHY0_CTLL);
  93
  94         val = readl_relaxed(priv->base + SATA_PORT_PHYCTL1);
  95         val &= ~AMPLITUDE_MASK;
  96         val |= AMPLITUDE_GEN3 << AMPLITUDE_GEN3_SHIFT |
  97                AMPLITUDE_GEN2 << AMPLITUDE_GEN2_SHIFT |
  98                AMPLITUDE_GEN1 << AMPLITUDE_GEN1_SHIFT;
  99         writel_relaxed(val, priv->base + SATA_PORT_PHYCTL1);
 100
 101         val = readl_relaxed(priv->base + SATA_PORT_PHYCTL2);
 102         val &= ~PREEMPH_MASK;
 103         val |= PREEMPH_GEN3 << PREEMPH_GEN3_SHIFT |
 104                PREEMPH_GEN2 << PREEMPH_GEN2_SHIFT |
 105                PREEMPH_GEN1 << PREEMPH_GEN1_SHIFT;
 106         writel_relaxed(val, priv->base + SATA_PORT_PHYCTL2);
 107
 108         /* ensure PHYCTRL setting takes effect */
 109         val = readl_relaxed(priv->base + SATA_PORT_PHYCTL);
 110         val &= ~SPEED_MODE_MASK;
 111         val |= SPEED_MODE_GEN1 << HALF_RATE_SHIFT |
 112                SPEED_MODE_GEN1 << PHY_CONFIG_SHIFT |
 113                SPEED_MODE_GEN1 << GEN2_EN_SHIFT | SPEED_CTRL;
 114         writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
 115
 116         msleep(20);
 117         val &= ~SPEED_MODE_MASK;
 118         val |= SPEED_MODE_GEN3 << HALF_RATE_SHIFT |
 119                SPEED_MODE_GEN3 << PHY_CONFIG_SHIFT |
 120                SPEED_MODE_GEN3 << GEN2_EN_SHIFT | SPEED_CTRL;
 121         writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
 122
 123         val &= ~(SPEED_MODE_MASK | SPEED_CTRL);
 124         val |= SPEED_MODE_GEN2 << HALF_RATE_SHIFT |
 125                SPEED_MODE_GEN2 << PHY_CONFIG_SHIFT |
 126                SPEED_MODE_GEN2 << GEN2_EN_SHIFT;
 127         writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
 128
 129         return 0;
 130 }
 131
 132 static const struct phy_ops hix5hd2_sata_phy_ops = {
 133         .init           = hix5hd2_sata_phy_init,
 134         .owner          = THIS_MODULE,
 135 };
 136
 137 static int hix5hd2_sata_phy_probe(struct platform_device *pdev)
 138 {
 139         struct phy_provider *phy_provider;
 140         struct device *dev = &pdev->dev;
 141         struct resource *res;
 142         struct phy *phy;
 143         struct hix5hd2_priv *priv;
 144
 145         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 146         if (!priv)
 147                 return -ENOMEM;
 148
 149         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 150         if (!res)
 151                 return -EINVAL;
 152
 153         priv->base = devm_ioremap(dev, res->start, resource_size(res));
 154         if (!priv->base)
 155                 return -ENOMEM;
 156
 157         priv->peri_ctrl = syscon_regmap_lookup_by_phandle(dev->of_node,
 158                                         "hisilicon,peripheral-syscon");
 159         if (IS_ERR(priv->peri_ctrl))
 160                 priv->peri_ctrl = NULL;
 161
 162         phy = devm_phy_create(dev, NULL, &hix5hd2_sata_phy_ops);
 163         if (IS_ERR(phy)) {
 164                 dev_err(dev, "failed to create PHY\n");
 165                 return PTR_ERR(phy);
 166         }
 167
 168         phy_set_drvdata(phy, priv);
 169         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 170         return PTR_ERR_OR_ZERO(phy_provider);
 171 }
 172
 173 static const struct of_device_id hix5hd2_sata_phy_of_match[] = {
 174         {.compatible = "hisilicon,hix5hd2-sata-phy",},
 175         { },
 176 };
 177 MODULE_DEVICE_TABLE(of, hix5hd2_sata_phy_of_match);
 178
 179 static struct platform_driver hix5hd2_sata_phy_driver = {
 180         .probe  = hix5hd2_sata_phy_probe,
 181         .driver = {
 182                 .name   = "hix5hd2-sata-phy",
 183                 .of_match_table = hix5hd2_sata_phy_of_match,
 184         }
 185 };
 186 module_platform_driver(hix5hd2_sata_phy_driver);
 187
 188 MODULE_AUTHOR("Jiancheng Xue <xuejiancheng@huawei.com>");
 189 MODULE_DESCRIPTION("HISILICON HIX5HD2 SATA PHY driver");
 190 MODULE_ALIAS("platform:hix5hd2-sata-phy");
 191 MODULE_LICENSE("GPL v2");