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// 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)
struct power_off_cfg {
char *mdio_node_name;
void (*phy_set_reg)(bool restart);
};
static struct phy_device *phydev;
static const struct power_off_cfg *cfg;
static void linkstation_mvphy_reg_intn(bool restart)
{
int rc = 0, saved_page;
u16 data = 0;
if (restart)
data = MII_88E1318S_PHY_LED_TCR_FORCE_INT;
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 const struct power_off_cfg linkstation_power_off_cfg = {
.mdio_node_name = "mdio",
.phy_set_reg = linkstation_mvphy_reg_intn,
};
static int linkstation_reboot_notifier(struct notifier_block *nb,
unsigned long action, void *unused)
{
if (action == SYS_RESTART)
cfg->phy_set_reg(true);
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);
cfg->phy_set_reg(false);
kernel_restart("Power off");
}
static const struct of_device_id ls_poweroff_of_match[] = {
{ .compatible = "buffalo,ls421d",
.data = &linkstation_power_off_cfg,
},
{ .compatible = "buffalo,ls421de",
.data = &linkstation_power_off_cfg,
},
{ },
};
static int __init linkstation_poweroff_init(void)
{
struct mii_bus *bus;
struct device_node *dn;
const struct of_device_id *match;
dn = of_find_matching_node(NULL, ls_poweroff_of_match);
if (!dn)
return -ENODEV;
of_node_put(dn);
match = of_match_node(ls_poweroff_of_match, dn);
cfg = match->data;
dn = of_find_node_by_name(NULL, cfg->mdio_node_name);
if (!dn)
return -ENODEV;
bus = of_mdio_find_bus(dn);
of_node_put(dn);
if (!bus)
return -EPROBE_DEFER;
phydev = phy_find_first(bus);
put_device(&bus->dev);
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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