Commit a7f79f99 authored by Daniel González Cabanelas's avatar Daniel González Cabanelas Committed by Sebastian Reichel

power: reset: add driver for LinkStation power off

Some Buffalo LinkStations perform the power off operation, at restart
time, depending on the state of an output pin (LED2/INTn) at the ethernet
PHY. This pin is also used to wake the machine when a WoL packet is
received by the PHY.

The driver is required by the Buffalo LinkStation LS421DE (ARM MVEBU),
and other models. Without it, the board remains forever halted if a
power off command is executed, unless the PSU is disconnected and
connected again.

Add the driver to provide the power off function and also make the WoL
feature to be available.
Signed-off-by: default avatarDaniel González Cabanelas <dgcbueu@gmail.com>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent ac31585f
...@@ -99,6 +99,17 @@ config POWER_RESET_HISI ...@@ -99,6 +99,17 @@ config POWER_RESET_HISI
help help
Reboot support for Hisilicon boards. 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 config POWER_RESET_MSM
bool "Qualcomm MSM power-off driver" bool "Qualcomm MSM power-off driver"
depends on ARCH_QCOM depends on ARCH_QCOM
......
...@@ -10,6 +10,7 @@ obj-$(CONFIG_POWER_RESET_GEMINI_POWEROFF) += gemini-poweroff.o ...@@ -10,6 +10,7 @@ obj-$(CONFIG_POWER_RESET_GEMINI_POWEROFF) += gemini-poweroff.o
obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
obj-${CONFIG_POWER_RESET_LINKSTATION} += linkstation-poweroff.o
obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
obj-$(CONFIG_POWER_RESET_MT6323) += mt6323-poweroff.o obj-$(CONFIG_POWER_RESET_MT6323) += mt6323-poweroff.o
obj-$(CONFIG_POWER_RESET_OXNAS) += oxnas-restart.o obj-$(CONFIG_POWER_RESET_OXNAS) += oxnas-restart.o
......
// 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);
}
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;
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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