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>
20 int mv88e6165_phy_read(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
21 int addr, int reg, u16 *val)
23 return mv88e6xxx_read(chip, addr, reg, val);
26 int mv88e6165_phy_write(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
27 int addr, int reg, u16 val)
29 return mv88e6xxx_write(chip, addr, reg, val);
32 int mv88e6xxx_phy_read(struct mv88e6xxx_chip *chip, int phy, int reg, u16 *val)
34 int addr = phy; /* PHY devices addresses start at 0x0 */
37 bus = mv88e6xxx_default_mdio_bus(chip);
41 if (!chip->info->ops->phy_read)
44 return chip->info->ops->phy_read(chip, bus, addr, reg, val);
47 int mv88e6xxx_phy_write(struct mv88e6xxx_chip *chip, int phy, int reg, u16 val)
49 int addr = phy; /* PHY devices addresses start at 0x0 */
52 bus = mv88e6xxx_default_mdio_bus(chip);
56 if (!chip->info->ops->phy_write)
59 return chip->info->ops->phy_write(chip, bus, addr, reg, val);
62 static int mv88e6xxx_phy_page_get(struct mv88e6xxx_chip *chip, int phy, u8 page)
64 return mv88e6xxx_phy_write(chip, phy, MV88E6XXX_PHY_PAGE, page);
67 static void mv88e6xxx_phy_page_put(struct mv88e6xxx_chip *chip, int phy)
71 /* Restore PHY page Copper 0x0 for access via the registered
74 err = mv88e6xxx_phy_write(chip, phy, MV88E6XXX_PHY_PAGE,
75 MV88E6XXX_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 */
89 if (reg == MV88E6XXX_PHY_PAGE)
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 */
107 if (reg == MV88E6XXX_PHY_PAGE)
110 err = mv88e6xxx_phy_page_get(chip, phy, page);
112 err = mv88e6xxx_phy_write(chip, phy, MV88E6XXX_PHY_PAGE, page);
114 err = mv88e6xxx_phy_write(chip, phy, reg, val);
116 mv88e6xxx_phy_page_put(chip, phy);
122 static int mv88e6xxx_phy_ppu_disable(struct mv88e6xxx_chip *chip)
124 if (!chip->info->ops->ppu_disable)
127 return chip->info->ops->ppu_disable(chip);
130 static int mv88e6xxx_phy_ppu_enable(struct mv88e6xxx_chip *chip)
132 if (!chip->info->ops->ppu_enable)
135 return chip->info->ops->ppu_enable(chip);
138 static void mv88e6xxx_phy_ppu_reenable_work(struct work_struct *ugly)
140 struct mv88e6xxx_chip *chip;
142 chip = container_of(ugly, struct mv88e6xxx_chip, ppu_work);
144 mutex_lock(&chip->reg_lock);
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);
152 mutex_unlock(&chip->reg_lock);
155 static void mv88e6xxx_phy_ppu_reenable_timer(struct timer_list *t)
157 struct mv88e6xxx_chip *chip = from_timer(chip, t, ppu_timer);
159 schedule_work(&chip->ppu_work);
162 static int mv88e6xxx_phy_ppu_access_get(struct mv88e6xxx_chip *chip)
166 mutex_lock(&chip->ppu_mutex);
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
173 if (!chip->ppu_disabled) {
174 ret = mv88e6xxx_phy_ppu_disable(chip);
176 mutex_unlock(&chip->ppu_mutex);
179 chip->ppu_disabled = 1;
181 del_timer(&chip->ppu_timer);
188 static void mv88e6xxx_phy_ppu_access_put(struct mv88e6xxx_chip *chip)
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);
195 static void mv88e6xxx_phy_ppu_state_init(struct mv88e6xxx_chip *chip)
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);
202 static void mv88e6xxx_phy_ppu_state_destroy(struct mv88e6xxx_chip *chip)
204 del_timer_sync(&chip->ppu_timer);
207 int mv88e6185_phy_ppu_read(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
208 int addr, int reg, u16 *val)
212 err = mv88e6xxx_phy_ppu_access_get(chip);
214 err = mv88e6xxx_read(chip, addr, reg, val);
215 mv88e6xxx_phy_ppu_access_put(chip);
221 int mv88e6185_phy_ppu_write(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
222 int addr, int reg, u16 val)
226 err = mv88e6xxx_phy_ppu_access_get(chip);
228 err = mv88e6xxx_write(chip, addr, reg, val);
229 mv88e6xxx_phy_ppu_access_put(chip);
235 void mv88e6xxx_phy_init(struct mv88e6xxx_chip *chip)
237 if (chip->info->ops->ppu_enable && chip->info->ops->ppu_disable)
238 mv88e6xxx_phy_ppu_state_init(chip);
241 void mv88e6xxx_phy_destroy(struct mv88e6xxx_chip *chip)
243 if (chip->info->ops->ppu_enable && chip->info->ops->ppu_disable)
244 mv88e6xxx_phy_ppu_state_destroy(chip);
247 int mv88e6xxx_phy_setup(struct mv88e6xxx_chip *chip)
249 return mv88e6xxx_phy_ppu_enable(chip);