linkstation-poweroff.c (5328B)
1// SPDX-License-Identifier: GPL-2.0 2/* 3 * LinkStation power off restart driver 4 * 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 0 17#define MII_MARVELL_LED_PAGE 3 18#define MII_MARVELL_WOL_PAGE 17 19#define MII_MARVELL_PHY_PAGE 22 20 21#define MII_PHY_LED_CTRL 16 22#define MII_PHY_LED_POL_CTRL 17 23#define MII_88E1318S_PHY_LED_TCR 18 24#define MII_88E1318S_PHY_WOL_CTRL 16 25#define MII_M1011_IEVENT 19 26 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 powering 69 * 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 powering 100 * 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");