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--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -99,6 +99,17 @@ config POWER_RESET_HISI
help
Reboot support for Hisilicon boards.
+config POWER_RESET_LINKSTATION
+ tristate "Buffalo LinkStation power-off driver"
+ depends on ARCH_MVEBU || COMPILE_TEST
+ depends on OF_MDIO && PHYLIB
+ help
+ This driver supports turning off some Buffalo LinkStations by
+ setting an output pin at the ethernet PHY to the correct state.
+ It also makes the device compatible with the WoL function.
+
+ Say Y here if you have a Buffalo LinkStation LS421D/E.
+
config POWER_RESET_MSM
bool "Qualcomm MSM power-off driver"
depends on ARCH_QCOM
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_POWER_RESET_GEMINI_POWEROFF
obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
+obj-${CONFIG_POWER_RESET_LINKSTATION} += linkstation-poweroff.o
obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
obj-$(CONFIG_POWER_RESET_QCOM_PON) += qcom-pon.o
obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
--- /dev/null
+++ b/drivers/power/reset/linkstation-poweroff.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * LinkStation power off restart driver
+ * Copyright (C) 2020 Daniel González Cabanelas <dgcbueu@gmail.com>
+ */
+
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/of_platform.h>
+#include <linux/reboot.h>
+#include <linux/phy.h>
+
+/* Defines from the eth phy Marvell driver */
+#define MII_MARVELL_COPPER_PAGE 0
+#define MII_MARVELL_LED_PAGE 3
+#define MII_MARVELL_WOL_PAGE 17
+#define MII_MARVELL_PHY_PAGE 22
+
+#define MII_PHY_LED_CTRL 16
+#define MII_88E1318S_PHY_LED_TCR 18
+#define MII_88E1318S_PHY_WOL_CTRL 16
+#define MII_M1011_IEVENT 19
+
+#define MII_88E1318S_PHY_LED_TCR_INTn_ENABLE BIT(7)
+#define MII_88E1318S_PHY_LED_TCR_FORCE_INT BIT(15)
+#define MII_88E1318S_PHY_WOL_CTRL_CLEAR_WOL_STATUS BIT(12)
+#define LED2_FORCE_ON (0x8 << 8)
+#define LEDMASK GENMASK(11,8)
+
+static struct phy_device *phydev;
+
+static void mvphy_reg_intn(u16 data)
+{
+ int rc = 0, saved_page;
+
+ saved_page = phy_select_page(phydev, MII_MARVELL_LED_PAGE);
+ if (saved_page < 0)
+ goto err;
+
+ /* Force manual LED2 control to let INTn work */
+ __phy_modify(phydev, MII_PHY_LED_CTRL, LEDMASK, LED2_FORCE_ON);
+
+ /* Set the LED[2]/INTn pin to the required state */
+ __phy_modify(phydev, MII_88E1318S_PHY_LED_TCR,
+ MII_88E1318S_PHY_LED_TCR_FORCE_INT,
+ MII_88E1318S_PHY_LED_TCR_INTn_ENABLE | data);
+
+ if (!data) {
+ /* Clear interrupts to ensure INTn won't be holded in high state */
+ __phy_write(phydev, MII_MARVELL_PHY_PAGE, MII_MARVELL_COPPER_PAGE);
+ __phy_read(phydev, MII_M1011_IEVENT);
+
+ /* If WOL was enabled and a magic packet was received before powering
+ * off, we won't be able to wake up by sending another magic packet.
+ * Clear WOL status.
+ */
+ __phy_write(phydev, MII_MARVELL_PHY_PAGE, MII_MARVELL_WOL_PAGE);
+ __phy_set_bits(phydev, MII_88E1318S_PHY_WOL_CTRL,
+ MII_88E1318S_PHY_WOL_CTRL_CLEAR_WOL_STATUS);
+ }
+err:
+ rc = phy_restore_page(phydev, saved_page, rc);
+ if (rc < 0)
+ dev_err(&phydev->mdio.dev, "Write register failed, %d\n", rc);
+
+ if (!data) {
+ /* Slow down the PHY to save energy */
+ rc= phy_speed_down(phydev, false);
+ if (rc < 0)
+ dev_err(&phydev->mdio.dev, "PHY speed down failed, %d\n", rc);
+ }
+}
+
+static int linkstation_reboot_notifier(struct notifier_block *nb,
+ unsigned long action, void *unused)
+{
+ if (action == SYS_RESTART)
+ mvphy_reg_intn(MII_88E1318S_PHY_LED_TCR_FORCE_INT);
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block linkstation_reboot_nb = {
+ .notifier_call = linkstation_reboot_notifier,
+};
+
+static void linkstation_poweroff(void)
+{
+ unregister_reboot_notifier(&linkstation_reboot_nb);
+ mvphy_reg_intn(0);
+
+ kernel_restart("Power off");
+}
+
+static const struct of_device_id ls_poweroff_of_match[] = {
+ { .compatible = "buffalo,ls421d" },
+ { .compatible = "buffalo,ls421de" },
+ { },
+};
+
+static int __init linkstation_poweroff_init(void)
+{
+ struct mii_bus *bus;
+ struct device_node *dn;
+
+ dn = of_find_matching_node(NULL, ls_poweroff_of_match);
+ if (!dn)
+ return -ENODEV;
+ of_node_put(dn);
+
+ dn = of_find_node_by_name(NULL, "mdio");
+ if (!dn)
+ return -ENODEV;
+
+ bus = of_mdio_find_bus(dn);
+ of_node_put(dn);
+ if (!bus)
+ return -EPROBE_DEFER;
+
+ phydev = phy_find_first(bus);
+ if (!phydev)
+ return -EPROBE_DEFER;
+
+ register_reboot_notifier(&linkstation_reboot_nb);
+ pm_power_off = linkstation_poweroff;
+
+ pr_info("LinkStation power off driver registered\n");
+ return 0;
+}
+
+static void __exit linkstation_poweroff_exit(void)
+{
+ pm_power_off = NULL;
+ unregister_reboot_notifier(&linkstation_reboot_nb);
+}
+
+module_init(linkstation_poweroff_init);
+module_exit(linkstation_poweroff_exit);
+
+MODULE_AUTHOR("Daniel González Cabanelas <dgcbueu@gmail.com>");
+MODULE_DESCRIPTION("LinkStation power off driver");
+MODULE_LICENSE("GPL v2");
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