drivers/phy/phy-qcom-ufs-i.h

   1 /*
   2  * Copyright (c) 2013-2015, Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #ifndef UFS_QCOM_PHY_I_H_
  16 #define UFS_QCOM_PHY_I_H_
  17
  18 #include <linux/module.h>
  19 #include <linux/clk.h>
  20 #include <linux/regulator/consumer.h>
  21 #include <linux/slab.h>
  22 #include <linux/phy/phy-qcom-ufs.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/io.h>
  25 #include <linux/delay.h>
  26
  27 #define readl_poll_timeout(addr, val, cond, sleep_us, timeout_us) \
  28 ({ \
  29         ktime_t timeout = ktime_add_us(ktime_get(), timeout_us); \
  30         might_sleep_if(timeout_us); \
  31         for (;;) { \
  32                 (val) = readl(addr); \
  33                 if (cond) \
  34                         break; \
  35                 if (timeout_us && ktime_compare(ktime_get(), timeout) > 0) { \
  36                         (val) = readl(addr); \
  37                         break; \
  38                 } \
  39                 if (sleep_us) \
  40                         usleep_range(DIV_ROUND_UP(sleep_us, 4), sleep_us); \
  41         } \
  42         (cond) ? 0 : -ETIMEDOUT; \
  43 })
  44
  45 #define UFS_QCOM_PHY_CAL_ENTRY(reg, val)        \
  46         {                               \
  47                 .reg_offset = reg,      \
  48                 .cfg_value = val,       \
  49         }
  50
  51 #define UFS_QCOM_PHY_NAME_LEN   30
  52
  53 enum {
  54         MASK_SERDES_START       = 0x1,
  55         MASK_PCS_READY          = 0x1,
  56 };
  57
  58 enum {
  59         OFFSET_SERDES_START     = 0x0,
  60 };
  61
  62 struct ufs_qcom_phy_stored_attributes {
  63         u32 att;
  64         u32 value;
  65 };
  66
  67
  68 struct ufs_qcom_phy_calibration {
  69         u32 reg_offset;
  70         u32 cfg_value;
  71 };
  72
  73 struct ufs_qcom_phy_vreg {
  74         const char *name;
  75         struct regulator *reg;
  76         int max_uA;
  77         int min_uV;
  78         int max_uV;
  79         bool enabled;
  80         bool is_always_on;
  81 };
  82
  83 struct ufs_qcom_phy {
  84         struct list_head list;
  85         struct device *dev;
  86         void __iomem *mmio;
  87         void __iomem *dev_ref_clk_ctrl_mmio;
  88         struct clk *tx_iface_clk;
  89         struct clk *rx_iface_clk;
  90         bool is_iface_clk_enabled;
  91         struct clk *ref_clk_src;
  92         struct clk *ref_clk_parent;
  93         struct clk *ref_clk;
  94         bool is_ref_clk_enabled;
  95         bool is_dev_ref_clk_enabled;
  96         struct ufs_qcom_phy_vreg vdda_pll;
  97         struct ufs_qcom_phy_vreg vdda_phy;
  98         struct ufs_qcom_phy_vreg vddp_ref_clk;
  99         unsigned int quirks;
 100
 101         /*
 102         * If UFS link is put into Hibern8 and if UFS PHY analog hardware is
 103         * power collapsed (by clearing UFS_PHY_POWER_DOWN_CONTROL), Hibern8
 104         * exit might fail even after powering on UFS PHY analog hardware.
 105         * Enabling this quirk will help to solve above issue by doing
 106         * custom PHY settings just before PHY analog power collapse.
 107         */
 108         #define UFS_QCOM_PHY_QUIRK_HIBERN8_EXIT_AFTER_PHY_PWR_COLLAPSE  BIT(0)
 109
 110         u8 host_ctrl_rev_major;
 111         u16 host_ctrl_rev_minor;
 112         u16 host_ctrl_rev_step;
 113
 114         char name[UFS_QCOM_PHY_NAME_LEN];
 115         struct ufs_qcom_phy_calibration *cached_regs;
 116         int cached_regs_table_size;
 117         bool is_powered_on;
 118         struct ufs_qcom_phy_specific_ops *phy_spec_ops;
 119 };
 120
 121 /**
 122  * struct ufs_qcom_phy_specific_ops - set of pointers to functions which have a
 123  * specific implementation per phy. Each UFS phy, should implement
 124  * those functions according to its spec and requirements
 125  * @calibrate_phy: pointer to a function that calibrate the phy
 126  * @start_serdes: pointer to a function that starts the serdes
 127  * @is_physical_coding_sublayer_ready: pointer to a function that
 128  * checks pcs readiness. returns 0 for success and non-zero for error.
 129  * @set_tx_lane_enable: pointer to a function that enable tx lanes
 130  * @power_control: pointer to a function that controls analog rail of phy
 131  * and writes to QSERDES_RX_SIGDET_CNTRL attribute
 132  */
 133 struct ufs_qcom_phy_specific_ops {
 134         int (*calibrate_phy)(struct ufs_qcom_phy *phy, bool is_rate_B);
 135         void (*start_serdes)(struct ufs_qcom_phy *phy);
 136         int (*is_physical_coding_sublayer_ready)(struct ufs_qcom_phy *phy);
 137         void (*set_tx_lane_enable)(struct ufs_qcom_phy *phy, u32 val);
 138         void (*power_control)(struct ufs_qcom_phy *phy, bool val);
 139 };
 140
 141 struct ufs_qcom_phy *get_ufs_qcom_phy(struct phy *generic_phy);
 142 int ufs_qcom_phy_power_on(struct phy *generic_phy);
 143 int ufs_qcom_phy_power_off(struct phy *generic_phy);
 144 int ufs_qcom_phy_exit(struct phy *generic_phy);
 145 int ufs_qcom_phy_init_clks(struct phy *generic_phy,
 146                         struct ufs_qcom_phy *phy_common);
 147 int ufs_qcom_phy_init_vregulators(struct phy *generic_phy,
 148                         struct ufs_qcom_phy *phy_common);
 149 int ufs_qcom_phy_remove(struct phy *generic_phy,
 150                        struct ufs_qcom_phy *ufs_qcom_phy);
 151 struct phy *ufs_qcom_phy_generic_probe(struct platform_device *pdev,
 152                         struct ufs_qcom_phy *common_cfg,
 153                         const struct phy_ops *ufs_qcom_phy_gen_ops,
 154                         struct ufs_qcom_phy_specific_ops *phy_spec_ops);
 155 int ufs_qcom_phy_calibrate(struct ufs_qcom_phy *ufs_qcom_phy,
 156                         struct ufs_qcom_phy_calibration *tbl_A, int tbl_size_A,
 157                         struct ufs_qcom_phy_calibration *tbl_B, int tbl_size_B,
 158                         bool is_rate_B);
 159 #endif