drivers/phy/marvell/phy-pxa-28nm-hsic.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2015 Linaro, Ltd.
   4  * Rob Herring <robh@kernel.org>
   5  *
   6  * Based on vendor driver:
   7  * Copyright (C) 2013 Marvell Inc.
   8  * Author: Chao Xie <xiechao.mail@gmail.com>
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/slab.h>
  13 #include <linux/of.h>
  14 #include <linux/io.h>
  15 #include <linux/iopoll.h>
  16 #include <linux/err.h>
  17 #include <linux/clk.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/phy/phy.h>
  21
  22 #define PHY_28NM_HSIC_CTRL                      0x08
  23 #define PHY_28NM_HSIC_IMPCAL_CAL                0x18
  24 #define PHY_28NM_HSIC_PLL_CTRL01                0x1c
  25 #define PHY_28NM_HSIC_PLL_CTRL2                 0x20
  26 #define PHY_28NM_HSIC_INT                       0x28
  27
  28 #define PHY_28NM_HSIC_PLL_SELLPFR_SHIFT         26
  29 #define PHY_28NM_HSIC_PLL_FBDIV_SHIFT           0
  30 #define PHY_28NM_HSIC_PLL_REFDIV_SHIFT          9
  31
  32 #define PHY_28NM_HSIC_S2H_PU_PLL                BIT(10)
  33 #define PHY_28NM_HSIC_H2S_PLL_LOCK              BIT(15)
  34 #define PHY_28NM_HSIC_S2H_HSIC_EN               BIT(7)
  35 #define S2H_DRV_SE0_4RESUME                     BIT(14)
  36 #define PHY_28NM_HSIC_H2S_IMPCAL_DONE           BIT(27)
  37
  38 #define PHY_28NM_HSIC_CONNECT_INT               BIT(1)
  39 #define PHY_28NM_HSIC_HS_READY_INT              BIT(2)
  40
  41 struct mv_hsic_phy {
  42         struct phy              *phy;
  43         struct platform_device  *pdev;
  44         void __iomem            *base;
  45         struct clk              *clk;
  46 };
  47
  48 static int wait_for_reg(void __iomem *reg, u32 mask, u32 ms)
  49 {
  50         u32 val;
  51
  52         return readl_poll_timeout(reg, val, ((val & mask) == mask),
  53                                   1000, 1000 * ms);
  54 }
  55
  56 static int mv_hsic_phy_init(struct phy *phy)
  57 {
  58         struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy);
  59         struct platform_device *pdev = mv_phy->pdev;
  60         void __iomem *base = mv_phy->base;
  61         int ret;
  62
  63         clk_prepare_enable(mv_phy->clk);
  64
  65         /* Set reference clock */
  66         writel(0x1 << PHY_28NM_HSIC_PLL_SELLPFR_SHIFT |
  67                 0xf0 << PHY_28NM_HSIC_PLL_FBDIV_SHIFT |
  68                 0xd << PHY_28NM_HSIC_PLL_REFDIV_SHIFT,
  69                 base + PHY_28NM_HSIC_PLL_CTRL01);
  70
  71         /* Turn on PLL */
  72         writel(readl(base + PHY_28NM_HSIC_PLL_CTRL2) |
  73                 PHY_28NM_HSIC_S2H_PU_PLL,
  74                 base + PHY_28NM_HSIC_PLL_CTRL2);
  75
  76         /* Make sure PHY PLL is locked */
  77         ret = wait_for_reg(base + PHY_28NM_HSIC_PLL_CTRL2,
  78                            PHY_28NM_HSIC_H2S_PLL_LOCK, 100);
  79         if (ret) {
  80                 dev_err(&pdev->dev, "HSIC PHY PLL not locked after 100mS.");
  81                 clk_disable_unprepare(mv_phy->clk);
  82         }
  83
  84         return ret;
  85 }
  86
  87 static int mv_hsic_phy_power_on(struct phy *phy)
  88 {
  89         struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy);
  90         struct platform_device *pdev = mv_phy->pdev;
  91         void __iomem *base = mv_phy->base;
  92         u32 reg;
  93         int ret;
  94
  95         reg = readl(base + PHY_28NM_HSIC_CTRL);
  96         /* Avoid SE0 state when resume for some device will take it as reset */
  97         reg &= ~S2H_DRV_SE0_4RESUME;
  98         reg |= PHY_28NM_HSIC_S2H_HSIC_EN;       /* Enable HSIC PHY */
  99         writel(reg, base + PHY_28NM_HSIC_CTRL);
 100
 101         /*
 102          *  Calibration Timing
 103          *                 ____________________________
 104          *  CAL START   ___|
 105          *                         ____________________
 106          *  CAL_DONE    ___________|
 107          *                 | 400us |
 108          */
 109
 110         /* Make sure PHY Calibration is ready */
 111         ret = wait_for_reg(base + PHY_28NM_HSIC_IMPCAL_CAL,
 112                            PHY_28NM_HSIC_H2S_IMPCAL_DONE, 100);
 113         if (ret) {
 114                 dev_warn(&pdev->dev, "HSIC PHY READY not set after 100mS.");
 115                 return ret;
 116         }
 117
 118         /* Waiting for HSIC connect int*/
 119         ret = wait_for_reg(base + PHY_28NM_HSIC_INT,
 120                            PHY_28NM_HSIC_CONNECT_INT, 200);
 121         if (ret)
 122                 dev_warn(&pdev->dev, "HSIC wait for connect interrupt timeout.");
 123
 124         return ret;
 125 }
 126
 127 static int mv_hsic_phy_power_off(struct phy *phy)
 128 {
 129         struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy);
 130         void __iomem *base = mv_phy->base;
 131
 132         writel(readl(base + PHY_28NM_HSIC_CTRL) & ~PHY_28NM_HSIC_S2H_HSIC_EN,
 133                 base + PHY_28NM_HSIC_CTRL);
 134
 135         return 0;
 136 }
 137
 138 static int mv_hsic_phy_exit(struct phy *phy)
 139 {
 140         struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy);
 141         void __iomem *base = mv_phy->base;
 142
 143         /* Turn off PLL */
 144         writel(readl(base + PHY_28NM_HSIC_PLL_CTRL2) &
 145                 ~PHY_28NM_HSIC_S2H_PU_PLL,
 146                 base + PHY_28NM_HSIC_PLL_CTRL2);
 147
 148         clk_disable_unprepare(mv_phy->clk);
 149         return 0;
 150 }
 151
 152
 153 static const struct phy_ops hsic_ops = {
 154         .init           = mv_hsic_phy_init,
 155         .power_on       = mv_hsic_phy_power_on,
 156         .power_off      = mv_hsic_phy_power_off,
 157         .exit           = mv_hsic_phy_exit,
 158         .owner          = THIS_MODULE,
 159 };
 160
 161 static int mv_hsic_phy_probe(struct platform_device *pdev)
 162 {
 163         struct phy_provider *phy_provider;
 164         struct mv_hsic_phy *mv_phy;
 165
 166         mv_phy = devm_kzalloc(&pdev->dev, sizeof(*mv_phy), GFP_KERNEL);
 167         if (!mv_phy)
 168                 return -ENOMEM;
 169
 170         mv_phy->pdev = pdev;
 171
 172         mv_phy->clk = devm_clk_get(&pdev->dev, NULL);
 173         if (IS_ERR(mv_phy->clk)) {
 174                 dev_err(&pdev->dev, "failed to get clock.\n");
 175                 return PTR_ERR(mv_phy->clk);
 176         }
 177
 178         mv_phy->base = devm_platform_ioremap_resource(pdev, 0);
 179         if (IS_ERR(mv_phy->base))
 180                 return PTR_ERR(mv_phy->base);
 181
 182         mv_phy->phy = devm_phy_create(&pdev->dev, pdev->dev.of_node, &hsic_ops);
 183         if (IS_ERR(mv_phy->phy))
 184                 return PTR_ERR(mv_phy->phy);
 185
 186         phy_set_drvdata(mv_phy->phy, mv_phy);
 187
 188         phy_provider = devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);
 189         return PTR_ERR_OR_ZERO(phy_provider);
 190 }
 191
 192 static const struct of_device_id mv_hsic_phy_dt_match[] = {
 193         { .compatible = "marvell,pxa1928-hsic-phy", },
 194         {},
 195 };
 196 MODULE_DEVICE_TABLE(of, mv_hsic_phy_dt_match);
 197
 198 static struct platform_driver mv_hsic_phy_driver = {
 199         .probe  = mv_hsic_phy_probe,
 200         .driver = {
 201                 .name   = "mv-hsic-phy",
 202                 .of_match_table = of_match_ptr(mv_hsic_phy_dt_match),
 203         },
 204 };
 205 module_platform_driver(mv_hsic_phy_driver);
 206
 207 MODULE_AUTHOR("Rob Herring <robh@kernel.org>");
 208 MODULE_DESCRIPTION("Marvell HSIC phy driver");
 209 MODULE_LICENSE("GPL v2");