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1// SPDX-License-Identifier: GPL-2.02/*3 * LinkStation power off restart driver4 * Copyright (C) 2020 Daniel González Cabanelas <dgcbueu@gmail.com>5 */6 7#include <linux/module.h>8#include <linux/notifier.h>9#include <linux/of.h>10#include <linux/of_mdio.h>11#include <linux/of_platform.h>12#include <linux/reboot.h>13#include <linux/phy.h>14 15/* Defines from the eth phy Marvell driver */16#define MII_MARVELL_COPPER_PAGE 017#define MII_MARVELL_LED_PAGE 318#define MII_MARVELL_WOL_PAGE 1719#define MII_MARVELL_PHY_PAGE 2220 21#define MII_PHY_LED_CTRL 1622#define MII_PHY_LED_POL_CTRL 1723#define MII_88E1318S_PHY_LED_TCR 1824#define MII_88E1318S_PHY_WOL_CTRL 1625#define MII_M1011_IEVENT 1926 27#define MII_88E1318S_PHY_LED_TCR_INTn_ENABLE BIT(7)28#define MII_88E1318S_PHY_LED_TCR_FORCE_INT BIT(15)29#define MII_88E1318S_PHY_WOL_CTRL_CLEAR_WOL_STATUS BIT(12)30#define LED2_FORCE_ON (0x8 << 8)31#define LEDMASK GENMASK(11,8)32 33#define MII_88E1318S_PHY_LED_POL_LED2 BIT(4)34 35struct power_off_cfg {36 char *mdio_node_name;37 void (*phy_set_reg)(bool restart);38};39 40static struct phy_device *phydev;41static const struct power_off_cfg *cfg;42 43static void linkstation_mvphy_reg_intn(bool restart)44{45 int rc = 0, saved_page;46 u16 data = 0;47 48 if (restart)49 data = MII_88E1318S_PHY_LED_TCR_FORCE_INT;50 51 saved_page = phy_select_page(phydev, MII_MARVELL_LED_PAGE);52 if (saved_page < 0)53 goto err;54 55 /* Force manual LED2 control to let INTn work */56 __phy_modify(phydev, MII_PHY_LED_CTRL, LEDMASK, LED2_FORCE_ON);57 58 /* Set the LED[2]/INTn pin to the required state */59 __phy_modify(phydev, MII_88E1318S_PHY_LED_TCR,60 MII_88E1318S_PHY_LED_TCR_FORCE_INT,61 MII_88E1318S_PHY_LED_TCR_INTn_ENABLE | data);62 63 if (!data) {64 /* Clear interrupts to ensure INTn won't be holded in high state */65 __phy_write(phydev, MII_MARVELL_PHY_PAGE, MII_MARVELL_COPPER_PAGE);66 __phy_read(phydev, MII_M1011_IEVENT);67 68 /* If WOL was enabled and a magic packet was received before powering69 * off, we won't be able to wake up by sending another magic packet.70 * Clear WOL status.71 */72 __phy_write(phydev, MII_MARVELL_PHY_PAGE, MII_MARVELL_WOL_PAGE);73 __phy_set_bits(phydev, MII_88E1318S_PHY_WOL_CTRL,74 MII_88E1318S_PHY_WOL_CTRL_CLEAR_WOL_STATUS);75 }76err:77 rc = phy_restore_page(phydev, saved_page, rc);78 if (rc < 0)79 dev_err(&phydev->mdio.dev, "Write register failed, %d\n", rc);80}81 82static void readynas_mvphy_set_reg(bool restart)83{84 int rc = 0, saved_page;85 u16 data = 0;86 87 if (restart)88 data = MII_88E1318S_PHY_LED_POL_LED2;89 90 saved_page = phy_select_page(phydev, MII_MARVELL_LED_PAGE);91 if (saved_page < 0)92 goto err;93 94 /* Set the LED[2].0 Polarity bit to the required state */95 __phy_modify(phydev, MII_PHY_LED_POL_CTRL,96 MII_88E1318S_PHY_LED_POL_LED2, data);97 98 if (!data) {99 /* If WOL was enabled and a magic packet was received before powering100 * off, we won't be able to wake up by sending another magic packet.101 * Clear WOL status.102 */103 __phy_write(phydev, MII_MARVELL_PHY_PAGE, MII_MARVELL_WOL_PAGE);104 __phy_set_bits(phydev, MII_88E1318S_PHY_WOL_CTRL,105 MII_88E1318S_PHY_WOL_CTRL_CLEAR_WOL_STATUS);106 }107err:108 rc = phy_restore_page(phydev, saved_page, rc);109 if (rc < 0)110 dev_err(&phydev->mdio.dev, "Write register failed, %d\n", rc);111}112 113static const struct power_off_cfg linkstation_power_off_cfg = {114 .mdio_node_name = "mdio",115 .phy_set_reg = linkstation_mvphy_reg_intn,116};117 118static const struct power_off_cfg readynas_power_off_cfg = {119 .mdio_node_name = "mdio-bus",120 .phy_set_reg = readynas_mvphy_set_reg,121};122 123static int linkstation_reboot_notifier(struct notifier_block *nb,124 unsigned long action, void *unused)125{126 if (action == SYS_RESTART)127 cfg->phy_set_reg(true);128 129 return NOTIFY_DONE;130}131 132static struct notifier_block linkstation_reboot_nb = {133 .notifier_call = linkstation_reboot_notifier,134};135 136static void linkstation_poweroff(void)137{138 unregister_reboot_notifier(&linkstation_reboot_nb);139 cfg->phy_set_reg(false);140 141 kernel_restart("Power off");142}143 144static const struct of_device_id ls_poweroff_of_match[] = {145 { .compatible = "buffalo,ls421d",146 .data = &linkstation_power_off_cfg,147 },148 { .compatible = "buffalo,ls421de",149 .data = &linkstation_power_off_cfg,150 },151 { .compatible = "netgear,readynas-duo-v2",152 .data = &readynas_power_off_cfg,153 },154 { },155};156 157static int __init linkstation_poweroff_init(void)158{159 struct mii_bus *bus;160 struct device_node *dn;161 const struct of_device_id *match;162 163 dn = of_find_matching_node(NULL, ls_poweroff_of_match);164 if (!dn)165 return -ENODEV;166 of_node_put(dn);167 168 match = of_match_node(ls_poweroff_of_match, dn);169 cfg = match->data;170 171 dn = of_find_node_by_name(NULL, cfg->mdio_node_name);172 if (!dn)173 return -ENODEV;174 175 bus = of_mdio_find_bus(dn);176 of_node_put(dn);177 if (!bus)178 return -EPROBE_DEFER;179 180 phydev = phy_find_first(bus);181 put_device(&bus->dev);182 if (!phydev)183 return -EPROBE_DEFER;184 185 register_reboot_notifier(&linkstation_reboot_nb);186 pm_power_off = linkstation_poweroff;187 188 return 0;189}190 191static void __exit linkstation_poweroff_exit(void)192{193 pm_power_off = NULL;194 unregister_reboot_notifier(&linkstation_reboot_nb);195}196 197module_init(linkstation_poweroff_init);198module_exit(linkstation_poweroff_exit);199 200MODULE_AUTHOR("Daniel González Cabanelas <dgcbueu@gmail.com>");201MODULE_DESCRIPTION("LinkStation power off driver");202MODULE_LICENSE("GPL v2");203