| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 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_88E1318S_PHY_LED_TCR 18 |
| 23 | #define MII_88E1318S_PHY_WOL_CTRL 16 |
| 24 | #define MII_M1011_IEVENT 19 |
| 25 | |
| 26 | #define MII_88E1318S_PHY_LED_TCR_INTn_ENABLE BIT(7) |
| 27 | #define MII_88E1318S_PHY_LED_TCR_FORCE_INT BIT(15) |
| 28 | #define MII_88E1318S_PHY_WOL_CTRL_CLEAR_WOL_STATUS BIT(12) |
| 29 | #define LED2_FORCE_ON (0x8 << 8) |
| 30 | #define LEDMASK GENMASK(11,8) |
| 31 | |
| 32 | static struct phy_device *phydev; |
| 33 | |
| 34 | static void mvphy_reg_intn(u16 data) |
| 35 | { |
| 36 | int rc = 0, saved_page; |
| 37 | |
| 38 | saved_page = phy_select_page(phydev, MII_MARVELL_LED_PAGE); |
| 39 | if (saved_page < 0) |
| 40 | goto err; |
| 41 | |
| 42 | /* Force manual LED2 control to let INTn work */ |
| 43 | __phy_modify(phydev, MII_PHY_LED_CTRL, LEDMASK, LED2_FORCE_ON); |
| 44 | |
| 45 | /* Set the LED[2]/INTn pin to the required state */ |
| 46 | __phy_modify(phydev, MII_88E1318S_PHY_LED_TCR, |
| 47 | MII_88E1318S_PHY_LED_TCR_FORCE_INT, |
| 48 | MII_88E1318S_PHY_LED_TCR_INTn_ENABLE | data); |
| 49 | |
| 50 | if (!data) { |
| 51 | /* Clear interrupts to ensure INTn won't be holded in high state */ |
| 52 | __phy_write(phydev, MII_MARVELL_PHY_PAGE, MII_MARVELL_COPPER_PAGE); |
| 53 | __phy_read(phydev, MII_M1011_IEVENT); |
| 54 | |
| 55 | /* If WOL was enabled and a magic packet was received before powering |
| 56 | * off, we won't be able to wake up by sending another magic packet. |
| 57 | * Clear WOL status. |
| 58 | */ |
| 59 | __phy_write(phydev, MII_MARVELL_PHY_PAGE, MII_MARVELL_WOL_PAGE); |
| 60 | __phy_set_bits(phydev, MII_88E1318S_PHY_WOL_CTRL, |
| 61 | MII_88E1318S_PHY_WOL_CTRL_CLEAR_WOL_STATUS); |
| 62 | } |
| 63 | err: |
| 64 | rc = phy_restore_page(phydev, saved_page, rc); |
| 65 | if (rc < 0) |
| 66 | dev_err(&phydev->mdio.dev, "Write register failed, %d\n", rc); |
| 67 | } |
| 68 | |
| 69 | static int linkstation_reboot_notifier(struct notifier_block *nb, |
| 70 | unsigned long action, void *unused) |
| 71 | { |
| 72 | if (action == SYS_RESTART) |
| 73 | mvphy_reg_intn(MII_88E1318S_PHY_LED_TCR_FORCE_INT); |
| 74 | |
| 75 | return NOTIFY_DONE; |
| 76 | } |
| 77 | |
| 78 | static struct notifier_block linkstation_reboot_nb = { |
| 79 | .notifier_call = linkstation_reboot_notifier, |
| 80 | }; |
| 81 | |
| 82 | static void linkstation_poweroff(void) |
| 83 | { |
| 84 | unregister_reboot_notifier(&linkstation_reboot_nb); |
| 85 | mvphy_reg_intn(0); |
| 86 | |
| 87 | kernel_restart("Power off"); |
| 88 | } |
| 89 | |
| 90 | static const struct of_device_id ls_poweroff_of_match[] = { |
| 91 | { .compatible = "buffalo,ls421d" }, |
| 92 | { .compatible = "buffalo,ls421de" }, |
| 93 | { }, |
| 94 | }; |
| 95 | |
| 96 | static int __init linkstation_poweroff_init(void) |
| 97 | { |
| 98 | struct mii_bus *bus; |
| 99 | struct device_node *dn; |
| 100 | |
| 101 | dn = of_find_matching_node(NULL, ls_poweroff_of_match); |
| 102 | if (!dn) |
| 103 | return -ENODEV; |
| 104 | of_node_put(dn); |
| 105 | |
| 106 | dn = of_find_node_by_name(NULL, "mdio"); |
| 107 | if (!dn) |
| 108 | return -ENODEV; |
| 109 | |
| 110 | bus = of_mdio_find_bus(dn); |
| 111 | of_node_put(dn); |
| 112 | if (!bus) |
| 113 | return -EPROBE_DEFER; |
| 114 | |
| 115 | phydev = phy_find_first(bus); |
| 116 | if (!phydev) |
| 117 | return -EPROBE_DEFER; |
| 118 | |
| 119 | register_reboot_notifier(&linkstation_reboot_nb); |
| 120 | pm_power_off = linkstation_poweroff; |
| 121 | |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | static void __exit linkstation_poweroff_exit(void) |
| 126 | { |
| 127 | pm_power_off = NULL; |
| 128 | unregister_reboot_notifier(&linkstation_reboot_nb); |
| 129 | } |
| 130 | |
| 131 | module_init(linkstation_poweroff_init); |
| 132 | module_exit(linkstation_poweroff_exit); |
| 133 | |
| 134 | MODULE_AUTHOR("Daniel González Cabanelas <dgcbueu@gmail.com>"); |
| 135 | MODULE_DESCRIPTION("LinkStation power off driver"); |
| 136 | MODULE_LICENSE("GPL v2"); |