1 /* 2 * Marvell 88e6xxx Ethernet switch PHY and PPU support 3 * 4 * Copyright (c) 2008 Marvell Semiconductor 5 * 6 * Copyright (c) 2017 Andrew Lunn <andrew@lunn.ch> 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 as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 */ 13 14 #include <linux/mdio.h> 15 #include <linux/module.h> 16 17 #include "chip.h" 18 #include "phy.h" 19 20 int mv88e6165_phy_read(struct mv88e6xxx_chip *chip, struct mii_bus *bus, 21 int addr, int reg, u16 *val) 22 { 23 return mv88e6xxx_read(chip, addr, reg, val); 24 } 25 26 int mv88e6165_phy_write(struct mv88e6xxx_chip *chip, struct mii_bus *bus, 27 int addr, int reg, u16 val) 28 { 29 return mv88e6xxx_write(chip, addr, reg, val); 30 } 31 32 int mv88e6xxx_phy_read(struct mv88e6xxx_chip *chip, int phy, int reg, u16 *val) 33 { 34 int addr = phy; /* PHY devices addresses start at 0x0 */ 35 struct mii_bus *bus; 36 37 bus = mv88e6xxx_default_mdio_bus(chip); 38 if (!bus) 39 return -EOPNOTSUPP; 40 41 if (!chip->info->ops->phy_read) 42 return -EOPNOTSUPP; 43 44 return chip->info->ops->phy_read(chip, bus, addr, reg, val); 45 } 46 47 int mv88e6xxx_phy_write(struct mv88e6xxx_chip *chip, int phy, int reg, u16 val) 48 { 49 int addr = phy; /* PHY devices addresses start at 0x0 */ 50 struct mii_bus *bus; 51 52 bus = mv88e6xxx_default_mdio_bus(chip); 53 if (!bus) 54 return -EOPNOTSUPP; 55 56 if (!chip->info->ops->phy_write) 57 return -EOPNOTSUPP; 58 59 return chip->info->ops->phy_write(chip, bus, addr, reg, val); 60 } 61 62 static int mv88e6xxx_phy_page_get(struct mv88e6xxx_chip *chip, int phy, u8 page) 63 { 64 return mv88e6xxx_phy_write(chip, phy, MV88E6XXX_PHY_PAGE, page); 65 } 66 67 static void mv88e6xxx_phy_page_put(struct mv88e6xxx_chip *chip, int phy) 68 { 69 int err; 70 71 /* Restore PHY page Copper 0x0 for access via the registered 72 * MDIO bus 73 */ 74 err = mv88e6xxx_phy_write(chip, phy, MV88E6XXX_PHY_PAGE, 75 MV88E6XXX_PHY_PAGE_COPPER); 76 if (unlikely(err)) { 77 dev_err(chip->dev, 78 "failed to restore PHY %d page Copper (%d)\n", 79 phy, err); 80 } 81 } 82 83 int mv88e6xxx_phy_page_read(struct mv88e6xxx_chip *chip, int phy, 84 u8 page, int reg, u16 *val) 85 { 86 int err; 87 88 /* There is no paging for registers 22 */ 89 if (reg == MV88E6XXX_PHY_PAGE) 90 return -EINVAL; 91 92 err = mv88e6xxx_phy_page_get(chip, phy, page); 93 if (!err) { 94 err = mv88e6xxx_phy_read(chip, phy, reg, val); 95 mv88e6xxx_phy_page_put(chip, phy); 96 } 97 98 return err; 99 } 100 101 int mv88e6xxx_phy_page_write(struct mv88e6xxx_chip *chip, int phy, 102 u8 page, int reg, u16 val) 103 { 104 int err; 105 106 /* There is no paging for registers 22 */ 107 if (reg == MV88E6XXX_PHY_PAGE) 108 return -EINVAL; 109 110 err = mv88e6xxx_phy_page_get(chip, phy, page); 111 if (!err) { 112 err = mv88e6xxx_phy_write(chip, phy, MV88E6XXX_PHY_PAGE, page); 113 mv88e6xxx_phy_page_put(chip, phy); 114 } 115 116 return err; 117 } 118 119 static int mv88e6xxx_phy_ppu_disable(struct mv88e6xxx_chip *chip) 120 { 121 if (!chip->info->ops->ppu_disable) 122 return 0; 123 124 return chip->info->ops->ppu_disable(chip); 125 } 126 127 static int mv88e6xxx_phy_ppu_enable(struct mv88e6xxx_chip *chip) 128 { 129 if (!chip->info->ops->ppu_enable) 130 return 0; 131 132 return chip->info->ops->ppu_enable(chip); 133 } 134 135 static void mv88e6xxx_phy_ppu_reenable_work(struct work_struct *ugly) 136 { 137 struct mv88e6xxx_chip *chip; 138 139 chip = container_of(ugly, struct mv88e6xxx_chip, ppu_work); 140 141 mutex_lock(&chip->reg_lock); 142 143 if (mutex_trylock(&chip->ppu_mutex)) { 144 if (mv88e6xxx_phy_ppu_enable(chip) == 0) 145 chip->ppu_disabled = 0; 146 mutex_unlock(&chip->ppu_mutex); 147 } 148 149 mutex_unlock(&chip->reg_lock); 150 } 151 152 static void mv88e6xxx_phy_ppu_reenable_timer(struct timer_list *t) 153 { 154 struct mv88e6xxx_chip *chip = from_timer(chip, t, ppu_timer); 155 156 schedule_work(&chip->ppu_work); 157 } 158 159 static int mv88e6xxx_phy_ppu_access_get(struct mv88e6xxx_chip *chip) 160 { 161 int ret; 162 163 mutex_lock(&chip->ppu_mutex); 164 165 /* If the PHY polling unit is enabled, disable it so that 166 * we can access the PHY registers. If it was already 167 * disabled, cancel the timer that is going to re-enable 168 * it. 169 */ 170 if (!chip->ppu_disabled) { 171 ret = mv88e6xxx_phy_ppu_disable(chip); 172 if (ret < 0) { 173 mutex_unlock(&chip->ppu_mutex); 174 return ret; 175 } 176 chip->ppu_disabled = 1; 177 } else { 178 del_timer(&chip->ppu_timer); 179 ret = 0; 180 } 181 182 return ret; 183 } 184 185 static void mv88e6xxx_phy_ppu_access_put(struct mv88e6xxx_chip *chip) 186 { 187 /* Schedule a timer to re-enable the PHY polling unit. */ 188 mod_timer(&chip->ppu_timer, jiffies + msecs_to_jiffies(10)); 189 mutex_unlock(&chip->ppu_mutex); 190 } 191 192 static void mv88e6xxx_phy_ppu_state_init(struct mv88e6xxx_chip *chip) 193 { 194 mutex_init(&chip->ppu_mutex); 195 INIT_WORK(&chip->ppu_work, mv88e6xxx_phy_ppu_reenable_work); 196 timer_setup(&chip->ppu_timer, mv88e6xxx_phy_ppu_reenable_timer, 0); 197 } 198 199 static void mv88e6xxx_phy_ppu_state_destroy(struct mv88e6xxx_chip *chip) 200 { 201 del_timer_sync(&chip->ppu_timer); 202 } 203 204 int mv88e6185_phy_ppu_read(struct mv88e6xxx_chip *chip, struct mii_bus *bus, 205 int addr, int reg, u16 *val) 206 { 207 int err; 208 209 err = mv88e6xxx_phy_ppu_access_get(chip); 210 if (!err) { 211 err = mv88e6xxx_read(chip, addr, reg, val); 212 mv88e6xxx_phy_ppu_access_put(chip); 213 } 214 215 return err; 216 } 217 218 int mv88e6185_phy_ppu_write(struct mv88e6xxx_chip *chip, struct mii_bus *bus, 219 int addr, int reg, u16 val) 220 { 221 int err; 222 223 err = mv88e6xxx_phy_ppu_access_get(chip); 224 if (!err) { 225 err = mv88e6xxx_write(chip, addr, reg, val); 226 mv88e6xxx_phy_ppu_access_put(chip); 227 } 228 229 return err; 230 } 231 232 void mv88e6xxx_phy_init(struct mv88e6xxx_chip *chip) 233 { 234 if (chip->info->ops->ppu_enable && chip->info->ops->ppu_disable) 235 mv88e6xxx_phy_ppu_state_init(chip); 236 } 237 238 void mv88e6xxx_phy_destroy(struct mv88e6xxx_chip *chip) 239 { 240 if (chip->info->ops->ppu_enable && chip->info->ops->ppu_disable) 241 mv88e6xxx_phy_ppu_state_destroy(chip); 242 } 243 244 int mv88e6xxx_phy_setup(struct mv88e6xxx_chip *chip) 245 { 246 return mv88e6xxx_phy_ppu_enable(chip); 247 } 248