1 /* 2 * Samsung SoC USB 1.1/2.0 PHY driver - S5PV210 support 3 * 4 * Copyright (C) 2013 Samsung Electronics Co., Ltd. 5 * Authors: Kamil Debski <k.debski@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/delay.h> 13 #include <linux/io.h> 14 #include <linux/phy/phy.h> 15 #include "phy-samsung-usb2.h" 16 17 /* Exynos USB PHY registers */ 18 19 /* PHY power control */ 20 #define S5PV210_UPHYPWR 0x0 21 22 #define S5PV210_UPHYPWR_PHY0_SUSPEND BIT(0) 23 #define S5PV210_UPHYPWR_PHY0_PWR BIT(3) 24 #define S5PV210_UPHYPWR_PHY0_OTG_PWR BIT(4) 25 #define S5PV210_UPHYPWR_PHY0 ( \ 26 S5PV210_UPHYPWR_PHY0_SUSPEND | \ 27 S5PV210_UPHYPWR_PHY0_PWR | \ 28 S5PV210_UPHYPWR_PHY0_OTG_PWR) 29 30 #define S5PV210_UPHYPWR_PHY1_SUSPEND BIT(6) 31 #define S5PV210_UPHYPWR_PHY1_PWR BIT(7) 32 #define S5PV210_UPHYPWR_PHY1 ( \ 33 S5PV210_UPHYPWR_PHY1_SUSPEND | \ 34 S5PV210_UPHYPWR_PHY1_PWR) 35 36 /* PHY clock control */ 37 #define S5PV210_UPHYCLK 0x4 38 39 #define S5PV210_UPHYCLK_PHYFSEL_MASK (0x3 << 0) 40 #define S5PV210_UPHYCLK_PHYFSEL_48MHZ (0x0 << 0) 41 #define S5PV210_UPHYCLK_PHYFSEL_24MHZ (0x3 << 0) 42 #define S5PV210_UPHYCLK_PHYFSEL_12MHZ (0x2 << 0) 43 44 #define S5PV210_UPHYCLK_PHY0_ID_PULLUP BIT(2) 45 #define S5PV210_UPHYCLK_PHY0_COMMON_ON BIT(4) 46 #define S5PV210_UPHYCLK_PHY1_COMMON_ON BIT(7) 47 48 /* PHY reset control */ 49 #define S5PV210_UPHYRST 0x8 50 51 #define S5PV210_URSTCON_PHY0 BIT(0) 52 #define S5PV210_URSTCON_OTG_HLINK BIT(1) 53 #define S5PV210_URSTCON_OTG_PHYLINK BIT(2) 54 #define S5PV210_URSTCON_PHY1_ALL BIT(3) 55 #define S5PV210_URSTCON_HOST_LINK_ALL BIT(4) 56 57 /* Isolation, configured in the power management unit */ 58 #define S5PV210_USB_ISOL_OFFSET 0x680c 59 #define S5PV210_USB_ISOL_DEVICE BIT(0) 60 #define S5PV210_USB_ISOL_HOST BIT(1) 61 62 63 enum s5pv210_phy_id { 64 S5PV210_DEVICE, 65 S5PV210_HOST, 66 S5PV210_NUM_PHYS, 67 }; 68 69 /* 70 * s5pv210_rate_to_clk() converts the supplied clock rate to the value that 71 * can be written to the phy register. 72 */ 73 static int s5pv210_rate_to_clk(unsigned long rate, u32 *reg) 74 { 75 switch (rate) { 76 case 12 * MHZ: 77 *reg = S5PV210_UPHYCLK_PHYFSEL_12MHZ; 78 break; 79 case 24 * MHZ: 80 *reg = S5PV210_UPHYCLK_PHYFSEL_24MHZ; 81 break; 82 case 48 * MHZ: 83 *reg = S5PV210_UPHYCLK_PHYFSEL_48MHZ; 84 break; 85 default: 86 return -EINVAL; 87 } 88 89 return 0; 90 } 91 92 static void s5pv210_isol(struct samsung_usb2_phy_instance *inst, bool on) 93 { 94 struct samsung_usb2_phy_driver *drv = inst->drv; 95 u32 mask; 96 97 switch (inst->cfg->id) { 98 case S5PV210_DEVICE: 99 mask = S5PV210_USB_ISOL_DEVICE; 100 break; 101 case S5PV210_HOST: 102 mask = S5PV210_USB_ISOL_HOST; 103 break; 104 default: 105 return; 106 } 107 108 regmap_update_bits(drv->reg_pmu, S5PV210_USB_ISOL_OFFSET, 109 mask, on ? 0 : mask); 110 } 111 112 static void s5pv210_phy_pwr(struct samsung_usb2_phy_instance *inst, bool on) 113 { 114 struct samsung_usb2_phy_driver *drv = inst->drv; 115 u32 rstbits = 0; 116 u32 phypwr = 0; 117 u32 rst; 118 u32 pwr; 119 120 switch (inst->cfg->id) { 121 case S5PV210_DEVICE: 122 phypwr = S5PV210_UPHYPWR_PHY0; 123 rstbits = S5PV210_URSTCON_PHY0; 124 break; 125 case S5PV210_HOST: 126 phypwr = S5PV210_UPHYPWR_PHY1; 127 rstbits = S5PV210_URSTCON_PHY1_ALL | 128 S5PV210_URSTCON_HOST_LINK_ALL; 129 break; 130 } 131 132 if (on) { 133 writel(drv->ref_reg_val, drv->reg_phy + S5PV210_UPHYCLK); 134 135 pwr = readl(drv->reg_phy + S5PV210_UPHYPWR); 136 pwr &= ~phypwr; 137 writel(pwr, drv->reg_phy + S5PV210_UPHYPWR); 138 139 rst = readl(drv->reg_phy + S5PV210_UPHYRST); 140 rst |= rstbits; 141 writel(rst, drv->reg_phy + S5PV210_UPHYRST); 142 udelay(10); 143 rst &= ~rstbits; 144 writel(rst, drv->reg_phy + S5PV210_UPHYRST); 145 } else { 146 pwr = readl(drv->reg_phy + S5PV210_UPHYPWR); 147 pwr |= phypwr; 148 writel(pwr, drv->reg_phy + S5PV210_UPHYPWR); 149 } 150 } 151 152 static int s5pv210_power_on(struct samsung_usb2_phy_instance *inst) 153 { 154 s5pv210_isol(inst, 0); 155 s5pv210_phy_pwr(inst, 1); 156 157 return 0; 158 } 159 160 static int s5pv210_power_off(struct samsung_usb2_phy_instance *inst) 161 { 162 s5pv210_phy_pwr(inst, 0); 163 s5pv210_isol(inst, 1); 164 165 return 0; 166 } 167 168 static const struct samsung_usb2_common_phy s5pv210_phys[S5PV210_NUM_PHYS] = { 169 [S5PV210_DEVICE] = { 170 .label = "device", 171 .id = S5PV210_DEVICE, 172 .power_on = s5pv210_power_on, 173 .power_off = s5pv210_power_off, 174 }, 175 [S5PV210_HOST] = { 176 .label = "host", 177 .id = S5PV210_HOST, 178 .power_on = s5pv210_power_on, 179 .power_off = s5pv210_power_off, 180 }, 181 }; 182 183 const struct samsung_usb2_phy_config s5pv210_usb2_phy_config = { 184 .num_phys = ARRAY_SIZE(s5pv210_phys), 185 .phys = s5pv210_phys, 186 .rate_to_clk = s5pv210_rate_to_clk, 187 }; 188