drivers/phy/hisilicon/phy-hix5hd2-sata.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2014 Linaro Ltd.
   4  * Copyright (c) 2014 Hisilicon Limited.
   5  */
   6
   7 #include <linux/delay.h>
   8 #include <linux/io.h>
   9 #include <linux/mfd/syscon.h>
  10 #include <linux/module.h>
  11 #include <linux/phy/phy.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/regmap.h>
  14
  15 #define SATA_PHY0_CTLL          0xa0
  16 #define MPLL_MULTIPLIER_SHIFT   1
  17 #define MPLL_MULTIPLIER_MASK    0xfe
  18 #define MPLL_MULTIPLIER_50M     0x3c
  19 #define MPLL_MULTIPLIER_100M    0x1e
  20 #define PHY_RESET               BIT(0)
  21 #define REF_SSP_EN              BIT(9)
  22 #define SSC_EN                  BIT(10)
  23 #define REF_USE_PAD             BIT(23)
  24
  25 #define SATA_PORT_PHYCTL        0x174
  26 #define SPEED_MODE_MASK         0x6f0000
  27 #define HALF_RATE_SHIFT         16
  28 #define PHY_CONFIG_SHIFT        18
  29 #define GEN2_EN_SHIFT           21
  30 #define SPEED_CTRL              BIT(20)
  31
  32 #define SATA_PORT_PHYCTL1       0x148
  33 #define AMPLITUDE_MASK          0x3ffffe
  34 #define AMPLITUDE_GEN3          0x68
  35 #define AMPLITUDE_GEN3_SHIFT    15
  36 #define AMPLITUDE_GEN2          0x56
  37 #define AMPLITUDE_GEN2_SHIFT    8
  38 #define AMPLITUDE_GEN1          0x56
  39 #define AMPLITUDE_GEN1_SHIFT    1
  40
  41 #define SATA_PORT_PHYCTL2       0x14c
  42 #define PREEMPH_MASK            0x3ffff
  43 #define PREEMPH_GEN3            0x20
  44 #define PREEMPH_GEN3_SHIFT      12
  45 #define PREEMPH_GEN2            0x15
  46 #define PREEMPH_GEN2_SHIFT      6
  47 #define PREEMPH_GEN1            0x5
  48 #define PREEMPH_GEN1_SHIFT      0
  49
  50 struct hix5hd2_priv {
  51         void __iomem    *base;
  52         struct regmap   *peri_ctrl;
  53 };
  54
  55 enum phy_speed_mode {
  56         SPEED_MODE_GEN1 = 0,
  57         SPEED_MODE_GEN2 = 1,
  58         SPEED_MODE_GEN3 = 2,
  59 };
  60
  61 static int hix5hd2_sata_phy_init(struct phy *phy)
  62 {
  63         struct hix5hd2_priv *priv = phy_get_drvdata(phy);
  64         u32 val, data[2];
  65         int ret;
  66
  67         if (priv->peri_ctrl) {
  68                 ret = of_property_read_u32_array(phy->dev.of_node,
  69                                                  "hisilicon,power-reg",
  70                                                  &data[0], 2);
  71                 if (ret) {
  72                         dev_err(&phy->dev, "Fail read hisilicon,power-reg\n");
  73                         return ret;
  74                 }
  75
  76                 regmap_update_bits(priv->peri_ctrl, data[0],
  77                                    BIT(data[1]), BIT(data[1]));
  78         }
  79
  80         /* reset phy */
  81         val = readl_relaxed(priv->base + SATA_PHY0_CTLL);
  82         val &= ~(MPLL_MULTIPLIER_MASK | REF_USE_PAD);
  83         val |= MPLL_MULTIPLIER_50M << MPLL_MULTIPLIER_SHIFT |
  84                REF_SSP_EN | PHY_RESET;
  85         writel_relaxed(val, priv->base + SATA_PHY0_CTLL);
  86         msleep(20);
  87         val &= ~PHY_RESET;
  88         writel_relaxed(val, priv->base + SATA_PHY0_CTLL);
  89
  90         val = readl_relaxed(priv->base + SATA_PORT_PHYCTL1);
  91         val &= ~AMPLITUDE_MASK;
  92         val |= AMPLITUDE_GEN3 << AMPLITUDE_GEN3_SHIFT |
  93                AMPLITUDE_GEN2 << AMPLITUDE_GEN2_SHIFT |
  94                AMPLITUDE_GEN1 << AMPLITUDE_GEN1_SHIFT;
  95         writel_relaxed(val, priv->base + SATA_PORT_PHYCTL1);
  96
  97         val = readl_relaxed(priv->base + SATA_PORT_PHYCTL2);
  98         val &= ~PREEMPH_MASK;
  99         val |= PREEMPH_GEN3 << PREEMPH_GEN3_SHIFT |
 100                PREEMPH_GEN2 << PREEMPH_GEN2_SHIFT |
 101                PREEMPH_GEN1 << PREEMPH_GEN1_SHIFT;
 102         writel_relaxed(val, priv->base + SATA_PORT_PHYCTL2);
 103
 104         /* ensure PHYCTRL setting takes effect */
 105         val = readl_relaxed(priv->base + SATA_PORT_PHYCTL);
 106         val &= ~SPEED_MODE_MASK;
 107         val |= SPEED_MODE_GEN1 << HALF_RATE_SHIFT |
 108                SPEED_MODE_GEN1 << PHY_CONFIG_SHIFT |
 109                SPEED_MODE_GEN1 << GEN2_EN_SHIFT | SPEED_CTRL;
 110         writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
 111
 112         msleep(20);
 113         val &= ~SPEED_MODE_MASK;
 114         val |= SPEED_MODE_GEN3 << HALF_RATE_SHIFT |
 115                SPEED_MODE_GEN3 << PHY_CONFIG_SHIFT |
 116                SPEED_MODE_GEN3 << GEN2_EN_SHIFT | SPEED_CTRL;
 117         writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
 118
 119         val &= ~(SPEED_MODE_MASK | SPEED_CTRL);
 120         val |= SPEED_MODE_GEN2 << HALF_RATE_SHIFT |
 121                SPEED_MODE_GEN2 << PHY_CONFIG_SHIFT |
 122                SPEED_MODE_GEN2 << GEN2_EN_SHIFT;
 123         writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
 124
 125         return 0;
 126 }
 127
 128 static const struct phy_ops hix5hd2_sata_phy_ops = {
 129         .init           = hix5hd2_sata_phy_init,
 130         .owner          = THIS_MODULE,
 131 };
 132
 133 static int hix5hd2_sata_phy_probe(struct platform_device *pdev)
 134 {
 135         struct phy_provider *phy_provider;
 136         struct device *dev = &pdev->dev;
 137         struct resource *res;
 138         struct phy *phy;
 139         struct hix5hd2_priv *priv;
 140
 141         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 142         if (!priv)
 143                 return -ENOMEM;
 144
 145         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 146         if (!res)
 147                 return -EINVAL;
 148
 149         priv->base = devm_ioremap(dev, res->start, resource_size(res));
 150         if (!priv->base)
 151                 return -ENOMEM;
 152
 153         priv->peri_ctrl = syscon_regmap_lookup_by_phandle(dev->of_node,
 154                                         "hisilicon,peripheral-syscon");
 155         if (IS_ERR(priv->peri_ctrl))
 156                 priv->peri_ctrl = NULL;
 157
 158         phy = devm_phy_create(dev, NULL, &hix5hd2_sata_phy_ops);
 159         if (IS_ERR(phy)) {
 160                 dev_err(dev, "failed to create PHY\n");
 161                 return PTR_ERR(phy);
 162         }
 163
 164         phy_set_drvdata(phy, priv);
 165         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 166         return PTR_ERR_OR_ZERO(phy_provider);
 167 }
 168
 169 static const struct of_device_id hix5hd2_sata_phy_of_match[] = {
 170         {.compatible = "hisilicon,hix5hd2-sata-phy",},
 171         { },
 172 };
 173 MODULE_DEVICE_TABLE(of, hix5hd2_sata_phy_of_match);
 174
 175 static struct platform_driver hix5hd2_sata_phy_driver = {
 176         .probe  = hix5hd2_sata_phy_probe,
 177         .driver = {
 178                 .name   = "hix5hd2-sata-phy",
 179                 .of_match_table = hix5hd2_sata_phy_of_match,
 180         }
 181 };
 182 module_platform_driver(hix5hd2_sata_phy_driver);
 183
 184 MODULE_AUTHOR("Jiancheng Xue <xuejiancheng@huawei.com>");
 185 MODULE_DESCRIPTION("HISILICON HIX5HD2 SATA PHY driver");
 186 MODULE_ALIAS("platform:hix5hd2-sata-phy");
 187 MODULE_LICENSE("GPL v2");