137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
// 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");
|