drivers/phy/phy-spear1310-miphy.c

   1 /*
   2  * ST SPEAr1310-miphy driver
   3  *
   4  * Copyright (C) 2014 ST Microelectronics
   5  * Pratyush Anand <pratyush.anand@gmail.com>
   6  * Mohit Kumar <mohit.kumar.dhaka@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/bitops.h>
  15 #include <linux/delay.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/kernel.h>
  18 #include <linux/mfd/syscon.h>
  19 #include <linux/module.h>
  20 #include <linux/of_device.h>
  21 #include <linux/phy/phy.h>
  22 #include <linux/regmap.h>
  23
  24 /* SPEAr1310 Registers */
  25 #define SPEAR1310_PCIE_SATA_CFG                 0x3A4
  26         #define SPEAR1310_PCIE_SATA2_SEL_PCIE           (0 << 31)
  27         #define SPEAR1310_PCIE_SATA1_SEL_PCIE           (0 << 30)
  28         #define SPEAR1310_PCIE_SATA0_SEL_PCIE           (0 << 29)
  29         #define SPEAR1310_PCIE_SATA2_SEL_SATA           BIT(31)
  30         #define SPEAR1310_PCIE_SATA1_SEL_SATA           BIT(30)
  31         #define SPEAR1310_PCIE_SATA0_SEL_SATA           BIT(29)
  32         #define SPEAR1310_SATA2_CFG_TX_CLK_EN           BIT(27)
  33         #define SPEAR1310_SATA2_CFG_RX_CLK_EN           BIT(26)
  34         #define SPEAR1310_SATA2_CFG_POWERUP_RESET       BIT(25)
  35         #define SPEAR1310_SATA2_CFG_PM_CLK_EN           BIT(24)
  36         #define SPEAR1310_SATA1_CFG_TX_CLK_EN           BIT(23)
  37         #define SPEAR1310_SATA1_CFG_RX_CLK_EN           BIT(22)
  38         #define SPEAR1310_SATA1_CFG_POWERUP_RESET       BIT(21)
  39         #define SPEAR1310_SATA1_CFG_PM_CLK_EN           BIT(20)
  40         #define SPEAR1310_SATA0_CFG_TX_CLK_EN           BIT(19)
  41         #define SPEAR1310_SATA0_CFG_RX_CLK_EN           BIT(18)
  42         #define SPEAR1310_SATA0_CFG_POWERUP_RESET       BIT(17)
  43         #define SPEAR1310_SATA0_CFG_PM_CLK_EN           BIT(16)
  44         #define SPEAR1310_PCIE2_CFG_DEVICE_PRESENT      BIT(11)
  45         #define SPEAR1310_PCIE2_CFG_POWERUP_RESET       BIT(10)
  46         #define SPEAR1310_PCIE2_CFG_CORE_CLK_EN         BIT(9)
  47         #define SPEAR1310_PCIE2_CFG_AUX_CLK_EN          BIT(8)
  48         #define SPEAR1310_PCIE1_CFG_DEVICE_PRESENT      BIT(7)
  49         #define SPEAR1310_PCIE1_CFG_POWERUP_RESET       BIT(6)
  50         #define SPEAR1310_PCIE1_CFG_CORE_CLK_EN         BIT(5)
  51         #define SPEAR1310_PCIE1_CFG_AUX_CLK_EN          BIT(4)
  52         #define SPEAR1310_PCIE0_CFG_DEVICE_PRESENT      BIT(3)
  53         #define SPEAR1310_PCIE0_CFG_POWERUP_RESET       BIT(2)
  54         #define SPEAR1310_PCIE0_CFG_CORE_CLK_EN         BIT(1)
  55         #define SPEAR1310_PCIE0_CFG_AUX_CLK_EN          BIT(0)
  56
  57         #define SPEAR1310_PCIE_CFG_MASK(x) ((0xF << (x * 4)) | BIT((x + 29)))
  58         #define SPEAR1310_SATA_CFG_MASK(x) ((0xF << (x * 4 + 16)) | \
  59                         BIT((x + 29)))
  60         #define SPEAR1310_PCIE_CFG_VAL(x) \
  61                         (SPEAR1310_PCIE_SATA##x##_SEL_PCIE | \
  62                         SPEAR1310_PCIE##x##_CFG_AUX_CLK_EN | \
  63                         SPEAR1310_PCIE##x##_CFG_CORE_CLK_EN | \
  64                         SPEAR1310_PCIE##x##_CFG_POWERUP_RESET | \
  65                         SPEAR1310_PCIE##x##_CFG_DEVICE_PRESENT)
  66         #define SPEAR1310_SATA_CFG_VAL(x) \
  67                         (SPEAR1310_PCIE_SATA##x##_SEL_SATA | \
  68                         SPEAR1310_SATA##x##_CFG_PM_CLK_EN | \
  69                         SPEAR1310_SATA##x##_CFG_POWERUP_RESET | \
  70                         SPEAR1310_SATA##x##_CFG_RX_CLK_EN | \
  71                         SPEAR1310_SATA##x##_CFG_TX_CLK_EN)
  72
  73 #define SPEAR1310_PCIE_MIPHY_CFG_1              0x3A8
  74         #define SPEAR1310_MIPHY_DUAL_OSC_BYPASS_EXT     BIT(31)
  75         #define SPEAR1310_MIPHY_DUAL_CLK_REF_DIV2       BIT(28)
  76         #define SPEAR1310_MIPHY_DUAL_PLL_RATIO_TOP(x)   (x << 16)
  77         #define SPEAR1310_MIPHY_SINGLE_OSC_BYPASS_EXT   BIT(15)
  78         #define SPEAR1310_MIPHY_SINGLE_CLK_REF_DIV2     BIT(12)
  79         #define SPEAR1310_MIPHY_SINGLE_PLL_RATIO_TOP(x) (x << 0)
  80         #define SPEAR1310_PCIE_SATA_MIPHY_CFG_SATA_MASK (0xFFFF)
  81         #define SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE_MASK (0xFFFF << 16)
  82         #define SPEAR1310_PCIE_SATA_MIPHY_CFG_SATA \
  83                         (SPEAR1310_MIPHY_DUAL_OSC_BYPASS_EXT | \
  84                         SPEAR1310_MIPHY_DUAL_CLK_REF_DIV2 | \
  85                         SPEAR1310_MIPHY_DUAL_PLL_RATIO_TOP(60) | \
  86                         SPEAR1310_MIPHY_SINGLE_OSC_BYPASS_EXT | \
  87                         SPEAR1310_MIPHY_SINGLE_CLK_REF_DIV2 | \
  88                         SPEAR1310_MIPHY_SINGLE_PLL_RATIO_TOP(60))
  89         #define SPEAR1310_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK \
  90                         (SPEAR1310_MIPHY_SINGLE_PLL_RATIO_TOP(120))
  91         #define SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE \
  92                         (SPEAR1310_MIPHY_DUAL_OSC_BYPASS_EXT | \
  93                         SPEAR1310_MIPHY_DUAL_PLL_RATIO_TOP(25) | \
  94                         SPEAR1310_MIPHY_SINGLE_OSC_BYPASS_EXT | \
  95                         SPEAR1310_MIPHY_SINGLE_PLL_RATIO_TOP(25))
  96
  97 #define SPEAR1310_PCIE_MIPHY_CFG_2              0x3AC
  98
  99 enum spear1310_miphy_mode {
 100         SATA,
 101         PCIE,
 102 };
 103
 104 struct spear1310_miphy_priv {
 105         /* instance id of this phy */
 106         u32                             id;
 107         /* phy mode: 0 for SATA 1 for PCIe */
 108         enum spear1310_miphy_mode       mode;
 109         /* regmap for any soc specific misc registers */
 110         struct regmap                   *misc;
 111         /* phy struct pointer */
 112         struct phy                      *phy;
 113 };
 114
 115 static int spear1310_miphy_pcie_init(struct spear1310_miphy_priv *priv)
 116 {
 117         u32 val;
 118
 119         regmap_update_bits(priv->misc, SPEAR1310_PCIE_MIPHY_CFG_1,
 120                            SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE_MASK,
 121                            SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE);
 122
 123         switch (priv->id) {
 124         case 0:
 125                 val = SPEAR1310_PCIE_CFG_VAL(0);
 126                 break;
 127         case 1:
 128                 val = SPEAR1310_PCIE_CFG_VAL(1);
 129                 break;
 130         case 2:
 131                 val = SPEAR1310_PCIE_CFG_VAL(2);
 132                 break;
 133         default:
 134                 return -EINVAL;
 135         }
 136
 137         regmap_update_bits(priv->misc, SPEAR1310_PCIE_SATA_CFG,
 138                            SPEAR1310_PCIE_CFG_MASK(priv->id), val);
 139
 140         return 0;
 141 }
 142
 143 static int spear1310_miphy_pcie_exit(struct spear1310_miphy_priv *priv)
 144 {
 145         regmap_update_bits(priv->misc, SPEAR1310_PCIE_SATA_CFG,
 146                            SPEAR1310_PCIE_CFG_MASK(priv->id), 0);
 147
 148         regmap_update_bits(priv->misc, SPEAR1310_PCIE_MIPHY_CFG_1,
 149                            SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE_MASK, 0);
 150
 151         return 0;
 152 }
 153
 154 static int spear1310_miphy_init(struct phy *phy)
 155 {
 156         struct spear1310_miphy_priv *priv = phy_get_drvdata(phy);
 157         int ret = 0;
 158
 159         if (priv->mode == PCIE)
 160                 ret = spear1310_miphy_pcie_init(priv);
 161
 162         return ret;
 163 }
 164
 165 static int spear1310_miphy_exit(struct phy *phy)
 166 {
 167         struct spear1310_miphy_priv *priv = phy_get_drvdata(phy);
 168         int ret = 0;
 169
 170         if (priv->mode == PCIE)
 171                 ret = spear1310_miphy_pcie_exit(priv);
 172
 173         return ret;
 174 }
 175
 176 static const struct of_device_id spear1310_miphy_of_match[] = {
 177         { .compatible = "st,spear1310-miphy" },
 178         { },
 179 };
 180 MODULE_DEVICE_TABLE(of, spear1310_miphy_of_match);
 181
 182 static const struct phy_ops spear1310_miphy_ops = {
 183         .init = spear1310_miphy_init,
 184         .exit = spear1310_miphy_exit,
 185         .owner = THIS_MODULE,
 186 };
 187
 188 static struct phy *spear1310_miphy_xlate(struct device *dev,
 189                                          struct of_phandle_args *args)
 190 {
 191         struct spear1310_miphy_priv *priv = dev_get_drvdata(dev);
 192
 193         if (args->args_count < 1) {
 194                 dev_err(dev, "DT did not pass correct no of args\n");
 195                 return ERR_PTR(-ENODEV);
 196         }
 197
 198         priv->mode = args->args[0];
 199
 200         if (priv->mode != SATA && priv->mode != PCIE) {
 201                 dev_err(dev, "DT did not pass correct phy mode\n");
 202                 return ERR_PTR(-ENODEV);
 203         }
 204
 205         return priv->phy;
 206 }
 207
 208 static int spear1310_miphy_probe(struct platform_device *pdev)
 209 {
 210         struct device *dev = &pdev->dev;
 211         struct spear1310_miphy_priv *priv;
 212         struct phy_provider *phy_provider;
 213
 214         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 215         if (!priv)
 216                 return -ENOMEM;
 217
 218         priv->misc =
 219                 syscon_regmap_lookup_by_phandle(dev->of_node, "misc");
 220         if (IS_ERR(priv->misc)) {
 221                 dev_err(dev, "failed to find misc regmap\n");
 222                 return PTR_ERR(priv->misc);
 223         }
 224
 225         if (of_property_read_u32(dev->of_node, "phy-id", &priv->id)) {
 226                 dev_err(dev, "failed to find phy id\n");
 227                 return -EINVAL;
 228         }
 229
 230         priv->phy = devm_phy_create(dev, NULL, &spear1310_miphy_ops);
 231         if (IS_ERR(priv->phy)) {
 232                 dev_err(dev, "failed to create SATA PCIe PHY\n");
 233                 return PTR_ERR(priv->phy);
 234         }
 235
 236         dev_set_drvdata(dev, priv);
 237         phy_set_drvdata(priv->phy, priv);
 238
 239         phy_provider =
 240                 devm_of_phy_provider_register(dev, spear1310_miphy_xlate);
 241         if (IS_ERR(phy_provider)) {
 242                 dev_err(dev, "failed to register phy provider\n");
 243                 return PTR_ERR(phy_provider);
 244         }
 245
 246         return 0;
 247 }
 248
 249 static struct platform_driver spear1310_miphy_driver = {
 250         .probe          = spear1310_miphy_probe,
 251         .driver = {
 252                 .name = "spear1310-miphy",
 253                 .of_match_table = of_match_ptr(spear1310_miphy_of_match),
 254         },
 255 };
 256
 257 module_platform_driver(spear1310_miphy_driver);
 258
 259 MODULE_DESCRIPTION("ST SPEAR1310-MIPHY driver");
 260 MODULE_AUTHOR("Pratyush Anand <pratyush.anand@gmail.com>");
 261 MODULE_LICENSE("GPL v2");