2 * Marvell 88e6xxx Ethernet switch PHY and PPU support
4 * Copyright (c) 2008 Marvell Semiconductor
6 * Copyright (c) 2017 Andrew Lunn <andrew@lunn.ch>
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.
14 #include <linux/mdio.h>
15 #include <linux/module.h>
18 #include "mv88e6xxx.h"
21 int mv88e6165_phy_read(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
22 int addr, int reg, u16 *val)
24 return mv88e6xxx_read(chip, addr, reg, val);
27 int mv88e6165_phy_write(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
28 int addr, int reg, u16 val)
30 return mv88e6xxx_write(chip, addr, reg, val);
33 int mv88e6xxx_phy_read(struct mv88e6xxx_chip *chip, int phy, int reg, u16 *val)
35 int addr = phy; /* PHY devices addresses start at 0x0 */
38 bus = mv88e6xxx_default_mdio_bus(chip);
42 if (!chip->info->ops->phy_read)
45 return chip->info->ops->phy_read(chip, bus, addr, reg, val);
48 int mv88e6xxx_phy_write(struct mv88e6xxx_chip *chip, int phy, int reg, u16 val)
50 int addr = phy; /* PHY devices addresses start at 0x0 */
53 bus = mv88e6xxx_default_mdio_bus(chip);
57 if (!chip->info->ops->phy_write)
60 return chip->info->ops->phy_write(chip, bus, addr, reg, val);
63 static int mv88e6xxx_phy_page_get(struct mv88e6xxx_chip *chip, int phy, u8 page)
65 return mv88e6xxx_phy_write(chip, phy, PHY_PAGE, page);
68 static void mv88e6xxx_phy_page_put(struct mv88e6xxx_chip *chip, int phy)
72 /* Restore PHY page Copper 0x0 for access via the registered
75 err = mv88e6xxx_phy_write(chip, phy, PHY_PAGE, PHY_PAGE_COPPER);
78 "failed to restore PHY %d page Copper (%d)\n",
83 int mv88e6xxx_phy_page_read(struct mv88e6xxx_chip *chip, int phy,
84 u8 page, int reg, u16 *val)
88 /* There is no paging for registers 22 */
92 err = mv88e6xxx_phy_page_get(chip, phy, page);
94 err = mv88e6xxx_phy_read(chip, phy, reg, val);
95 mv88e6xxx_phy_page_put(chip, phy);
101 int mv88e6xxx_phy_page_write(struct mv88e6xxx_chip *chip, int phy,
102 u8 page, int reg, u16 val)
106 /* There is no paging for registers 22 */
110 err = mv88e6xxx_phy_page_get(chip, phy, page);
112 err = mv88e6xxx_phy_write(chip, phy, PHY_PAGE, page);
113 mv88e6xxx_phy_page_put(chip, phy);
119 static int mv88e6xxx_ppu_disable(struct mv88e6xxx_chip *chip)
121 if (!chip->info->ops->ppu_disable)
124 return chip->info->ops->ppu_disable(chip);
127 int mv88e6xxx_ppu_enable(struct mv88e6xxx_chip *chip)
129 if (!chip->info->ops->ppu_enable)
132 return chip->info->ops->ppu_enable(chip);
135 static void mv88e6xxx_ppu_reenable_work(struct work_struct *ugly)
137 struct mv88e6xxx_chip *chip;
139 chip = container_of(ugly, struct mv88e6xxx_chip, ppu_work);
141 mutex_lock(&chip->reg_lock);
143 if (mutex_trylock(&chip->ppu_mutex)) {
144 if (mv88e6xxx_ppu_enable(chip) == 0)
145 chip->ppu_disabled = 0;
146 mutex_unlock(&chip->ppu_mutex);
149 mutex_unlock(&chip->reg_lock);
152 static void mv88e6xxx_ppu_reenable_timer(unsigned long _ps)
154 struct mv88e6xxx_chip *chip = (void *)_ps;
156 schedule_work(&chip->ppu_work);
159 static int mv88e6xxx_ppu_access_get(struct mv88e6xxx_chip *chip)
163 mutex_lock(&chip->ppu_mutex);
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
170 if (!chip->ppu_disabled) {
171 ret = mv88e6xxx_ppu_disable(chip);
173 mutex_unlock(&chip->ppu_mutex);
176 chip->ppu_disabled = 1;
178 del_timer(&chip->ppu_timer);
185 static void mv88e6xxx_ppu_access_put(struct mv88e6xxx_chip *chip)
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);
192 static void mv88e6xxx_ppu_state_init(struct mv88e6xxx_chip *chip)
194 mutex_init(&chip->ppu_mutex);
195 INIT_WORK(&chip->ppu_work, mv88e6xxx_ppu_reenable_work);
196 setup_timer(&chip->ppu_timer, mv88e6xxx_ppu_reenable_timer,
197 (unsigned long)chip);
200 static void mv88e6xxx_ppu_state_destroy(struct mv88e6xxx_chip *chip)
202 del_timer_sync(&chip->ppu_timer);
205 int mv88e6xxx_phy_ppu_read(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
206 int addr, int reg, u16 *val)
210 err = mv88e6xxx_ppu_access_get(chip);
212 err = mv88e6xxx_read(chip, addr, reg, val);
213 mv88e6xxx_ppu_access_put(chip);
219 int mv88e6xxx_phy_ppu_write(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
220 int addr, int reg, u16 val)
224 err = mv88e6xxx_ppu_access_get(chip);
226 err = mv88e6xxx_write(chip, addr, reg, val);
227 mv88e6xxx_ppu_access_put(chip);
233 void mv88e6xxx_phy_init(struct mv88e6xxx_chip *chip)
235 if (chip->info->ops->ppu_enable && chip->info->ops->ppu_disable)
236 mv88e6xxx_ppu_state_init(chip);
239 void mv88e6xxx_phy_destroy(struct mv88e6xxx_chip *chip)
241 if (chip->info->ops->ppu_enable && chip->info->ops->ppu_disable)
242 mv88e6xxx_ppu_state_destroy(chip);