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 if (!err) 114 err = mv88e6xxx_phy_write(chip, phy, reg, val); 115 116 mv88e6xxx_phy_page_put(chip, phy); 117 } 118 119 return err; 120 } 121 122 static int mv88e6xxx_phy_ppu_disable(struct mv88e6xxx_chip *chip) 123 { 124 if (!chip->info->ops->ppu_disable) 125 return 0; 126 127 return chip->info->ops->ppu_disable(chip); 128 } 129 130 static int mv88e6xxx_phy_ppu_enable(struct mv88e6xxx_chip *chip) 131 { 132 if (!chip->info->ops->ppu_enable) 133 return 0; 134 135 return chip->info->ops->ppu_enable(chip); 136 } 137 138 static void mv88e6xxx_phy_ppu_reenable_work(struct work_struct *ugly) 139 { 140 struct mv88e6xxx_chip *chip; 141 142 chip = container_of(ugly, struct mv88e6xxx_chip, ppu_work); 143 144 mutex_lock(&chip->reg_lock); 145 146 if (mutex_trylock(&chip->ppu_mutex)) { 147 if (mv88e6xxx_phy_ppu_enable(chip) == 0) 148 chip->ppu_disabled = 0; 149 mutex_unlock(&chip->ppu_mutex); 150 } 151 152 mutex_unlock(&chip->reg_lock); 153 } 154 155 static void mv88e6xxx_phy_ppu_reenable_timer(struct timer_list *t) 156 { 157 struct mv88e6xxx_chip *chip = from_timer(chip, t, ppu_timer); 158 159 schedule_work(&chip->ppu_work); 160 } 161 162 static int mv88e6xxx_phy_ppu_access_get(struct mv88e6xxx_chip *chip) 163 { 164 int ret; 165 166 mutex_lock(&chip->ppu_mutex); 167 168 /* If the PHY polling unit is enabled, disable it so that 169 * we can access the PHY registers. If it was already 170 * disabled, cancel the timer that is going to re-enable 171 * it. 172 */ 173 if (!chip->ppu_disabled) { 174 ret = mv88e6xxx_phy_ppu_disable(chip); 175 if (ret < 0) { 176 mutex_unlock(&chip->ppu_mutex); 177 return ret; 178 } 179 chip->ppu_disabled = 1; 180 } else { 181 del_timer(&chip->ppu_timer); 182 ret = 0; 183 } 184 185 return ret; 186 } 187 188 static void mv88e6xxx_phy_ppu_access_put(struct mv88e6xxx_chip *chip) 189 { 190 /* Schedule a timer to re-enable the PHY polling unit. */ 191 mod_timer(&chip->ppu_timer, jiffies + msecs_to_jiffies(10)); 192 mutex_unlock(&chip->ppu_mutex); 193 } 194 195 static void mv88e6xxx_phy_ppu_state_init(struct mv88e6xxx_chip *chip) 196 { 197 mutex_init(&chip->ppu_mutex); 198 INIT_WORK(&chip->ppu_work, mv88e6xxx_phy_ppu_reenable_work); 199 timer_setup(&chip->ppu_timer, mv88e6xxx_phy_ppu_reenable_timer, 0); 200 } 201 202 static void mv88e6xxx_phy_ppu_state_destroy(struct mv88e6xxx_chip *chip) 203 { 204 del_timer_sync(&chip->ppu_timer); 205 } 206 207 int mv88e6185_phy_ppu_read(struct mv88e6xxx_chip *chip, struct mii_bus *bus, 208 int addr, int reg, u16 *val) 209 { 210 int err; 211 212 err = mv88e6xxx_phy_ppu_access_get(chip); 213 if (!err) { 214 err = mv88e6xxx_read(chip, addr, reg, val); 215 mv88e6xxx_phy_ppu_access_put(chip); 216 } 217 218 return err; 219 } 220 221 int mv88e6185_phy_ppu_write(struct mv88e6xxx_chip *chip, struct mii_bus *bus, 222 int addr, int reg, u16 val) 223 { 224 int err; 225 226 err = mv88e6xxx_phy_ppu_access_get(chip); 227 if (!err) { 228 err = mv88e6xxx_write(chip, addr, reg, val); 229 mv88e6xxx_phy_ppu_access_put(chip); 230 } 231 232 return err; 233 } 234 235 void mv88e6xxx_phy_init(struct mv88e6xxx_chip *chip) 236 { 237 if (chip->info->ops->ppu_enable && chip->info->ops->ppu_disable) 238 mv88e6xxx_phy_ppu_state_init(chip); 239 } 240 241 void mv88e6xxx_phy_destroy(struct mv88e6xxx_chip *chip) 242 { 243 if (chip->info->ops->ppu_enable && chip->info->ops->ppu_disable) 244 mv88e6xxx_phy_ppu_state_destroy(chip); 245 } 246 247 int mv88e6xxx_phy_setup(struct mv88e6xxx_chip *chip) 248 { 249 return mv88e6xxx_phy_ppu_enable(chip); 250 } 251