1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Marvell 88e6xxx Ethernet switch PHY and PPU support
5 * Copyright (c) 2008 Marvell Semiconductor
10 #include <linux/mdio.h>
11 #include <linux/module.h>
16 int mv88e6165_phy_read(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
17 int addr, int reg, u16 *val)
19 return mv88e6xxx_read(chip, addr, reg, val);
22 int mv88e6165_phy_write(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
23 int addr, int reg, u16 val)
25 return mv88e6xxx_write(chip, addr, reg, val);
28 int mv88e6xxx_phy_read(struct mv88e6xxx_chip *chip, int phy, int reg, u16 *val)
30 int addr = phy; /* PHY devices addresses start at 0x0 */
33 bus = mv88e6xxx_default_mdio_bus(chip);
37 if (!chip->info->ops->phy_read)
40 return chip->info->ops->phy_read(chip, bus, addr, reg, val);
43 int mv88e6xxx_phy_write(struct mv88e6xxx_chip *chip, int phy, int reg, u16 val)
45 int addr = phy; /* PHY devices addresses start at 0x0 */
48 bus = mv88e6xxx_default_mdio_bus(chip);
52 if (!chip->info->ops->phy_write)
55 return chip->info->ops->phy_write(chip, bus, addr, reg, val);
58 int mv88e6xxx_phy_read_c45(struct mv88e6xxx_chip *chip, int phy, int devad,
61 int addr = phy; /* PHY devices addresses start at 0x0 */
64 bus = mv88e6xxx_default_mdio_bus(chip);
68 if (!chip->info->ops->phy_read_c45)
71 return chip->info->ops->phy_read_c45(chip, bus, addr, devad, reg, val);
74 int mv88e6xxx_phy_write_c45(struct mv88e6xxx_chip *chip, int phy, int devad,
77 int addr = phy; /* PHY devices addresses start at 0x0 */
80 bus = mv88e6xxx_default_mdio_bus(chip);
84 if (!chip->info->ops->phy_write_c45)
87 return chip->info->ops->phy_write_c45(chip, bus, addr, devad, reg, val);
90 static int mv88e6xxx_phy_page_get(struct mv88e6xxx_chip *chip, int phy, u8 page)
92 return mv88e6xxx_phy_write(chip, phy, MV88E6XXX_PHY_PAGE, page);
95 static void mv88e6xxx_phy_page_put(struct mv88e6xxx_chip *chip, int phy)
99 /* Restore PHY page Copper 0x0 for access via the registered
102 err = mv88e6xxx_phy_write(chip, phy, MV88E6XXX_PHY_PAGE,
103 MV88E6XXX_PHY_PAGE_COPPER);
106 "failed to restore PHY %d page Copper (%d)\n",
111 int mv88e6xxx_phy_page_read(struct mv88e6xxx_chip *chip, int phy,
112 u8 page, int reg, u16 *val)
116 /* There is no paging for registers 22 */
117 if (reg == MV88E6XXX_PHY_PAGE)
120 err = mv88e6xxx_phy_page_get(chip, phy, page);
122 err = mv88e6xxx_phy_read(chip, phy, reg, val);
123 mv88e6xxx_phy_page_put(chip, phy);
129 int mv88e6xxx_phy_page_write(struct mv88e6xxx_chip *chip, int phy,
130 u8 page, int reg, u16 val)
134 /* There is no paging for registers 22 */
135 if (reg == MV88E6XXX_PHY_PAGE)
138 err = mv88e6xxx_phy_page_get(chip, phy, page);
140 err = mv88e6xxx_phy_write(chip, phy, MV88E6XXX_PHY_PAGE, page);
142 err = mv88e6xxx_phy_write(chip, phy, reg, val);
144 mv88e6xxx_phy_page_put(chip, phy);
150 static int mv88e6xxx_phy_ppu_disable(struct mv88e6xxx_chip *chip)
152 if (!chip->info->ops->ppu_disable)
155 return chip->info->ops->ppu_disable(chip);
158 static int mv88e6xxx_phy_ppu_enable(struct mv88e6xxx_chip *chip)
160 if (!chip->info->ops->ppu_enable)
163 return chip->info->ops->ppu_enable(chip);
166 static void mv88e6xxx_phy_ppu_reenable_work(struct work_struct *ugly)
168 struct mv88e6xxx_chip *chip;
170 chip = container_of(ugly, struct mv88e6xxx_chip, ppu_work);
172 mv88e6xxx_reg_lock(chip);
174 if (mutex_trylock(&chip->ppu_mutex)) {
175 if (mv88e6xxx_phy_ppu_enable(chip) == 0)
176 chip->ppu_disabled = 0;
177 mutex_unlock(&chip->ppu_mutex);
180 mv88e6xxx_reg_unlock(chip);
183 static void mv88e6xxx_phy_ppu_reenable_timer(struct timer_list *t)
185 struct mv88e6xxx_chip *chip = from_timer(chip, t, ppu_timer);
187 schedule_work(&chip->ppu_work);
190 static int mv88e6xxx_phy_ppu_access_get(struct mv88e6xxx_chip *chip)
194 mutex_lock(&chip->ppu_mutex);
196 /* If the PHY polling unit is enabled, disable it so that
197 * we can access the PHY registers. If it was already
198 * disabled, cancel the timer that is going to re-enable
201 if (!chip->ppu_disabled) {
202 ret = mv88e6xxx_phy_ppu_disable(chip);
204 mutex_unlock(&chip->ppu_mutex);
207 chip->ppu_disabled = 1;
209 del_timer(&chip->ppu_timer);
216 static void mv88e6xxx_phy_ppu_access_put(struct mv88e6xxx_chip *chip)
218 /* Schedule a timer to re-enable the PHY polling unit. */
219 mod_timer(&chip->ppu_timer, jiffies + msecs_to_jiffies(10));
220 mutex_unlock(&chip->ppu_mutex);
223 static void mv88e6xxx_phy_ppu_state_init(struct mv88e6xxx_chip *chip)
225 mutex_init(&chip->ppu_mutex);
226 INIT_WORK(&chip->ppu_work, mv88e6xxx_phy_ppu_reenable_work);
227 timer_setup(&chip->ppu_timer, mv88e6xxx_phy_ppu_reenable_timer, 0);
230 static void mv88e6xxx_phy_ppu_state_destroy(struct mv88e6xxx_chip *chip)
232 del_timer_sync(&chip->ppu_timer);
235 int mv88e6185_phy_ppu_read(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
236 int addr, int reg, u16 *val)
240 err = mv88e6xxx_phy_ppu_access_get(chip);
242 err = mv88e6xxx_read(chip, addr, reg, val);
243 mv88e6xxx_phy_ppu_access_put(chip);
249 int mv88e6185_phy_ppu_write(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
250 int addr, int reg, u16 val)
254 err = mv88e6xxx_phy_ppu_access_get(chip);
256 err = mv88e6xxx_write(chip, addr, reg, val);
257 mv88e6xxx_phy_ppu_access_put(chip);
263 void mv88e6xxx_phy_init(struct mv88e6xxx_chip *chip)
265 if (chip->info->ops->ppu_enable && chip->info->ops->ppu_disable)
266 mv88e6xxx_phy_ppu_state_init(chip);
269 void mv88e6xxx_phy_destroy(struct mv88e6xxx_chip *chip)
271 if (chip->info->ops->ppu_enable && chip->info->ops->ppu_disable)
272 mv88e6xxx_phy_ppu_state_destroy(chip);
275 int mv88e6xxx_phy_setup(struct mv88e6xxx_chip *chip)
277 return mv88e6xxx_phy_ppu_enable(chip);