138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* LinkStation power off restart driver
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* Copyright (C) 2020 Daniel González Cabanelas <dgcbueu@gmail.com>
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*/
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/of.h>
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#include <linux/of_mdio.h>
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#include <linux/of_platform.h>
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#include <linux/reboot.h>
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#include <linux/phy.h>
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/* Defines from the eth phy Marvell driver */
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#define MII_MARVELL_COPPER_PAGE 0
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#define MII_MARVELL_LED_PAGE 3
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#define MII_MARVELL_WOL_PAGE 17
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#define MII_MARVELL_PHY_PAGE 22
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#define MII_PHY_LED_CTRL 16
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#define MII_88E1318S_PHY_LED_TCR 18
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#define MII_88E1318S_PHY_WOL_CTRL 16
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#define MII_M1011_IEVENT 19
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#define MII_88E1318S_PHY_LED_TCR_INTn_ENABLE BIT(7)
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#define MII_88E1318S_PHY_LED_TCR_FORCE_INT BIT(15)
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#define MII_88E1318S_PHY_WOL_CTRL_CLEAR_WOL_STATUS BIT(12)
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#define LED2_FORCE_ON (0x8 << 8)
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#define LEDMASK GENMASK(11,8)
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static struct phy_device *phydev;
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static void mvphy_reg_intn(u16 data)
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{
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int rc = 0, saved_page;
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saved_page = phy_select_page(phydev, MII_MARVELL_LED_PAGE);
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if (saved_page < 0)
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goto err;
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/* Force manual LED2 control to let INTn work */
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__phy_modify(phydev, MII_PHY_LED_CTRL, LEDMASK, LED2_FORCE_ON);
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/* Set the LED[2]/INTn pin to the required state */
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__phy_modify(phydev, MII_88E1318S_PHY_LED_TCR,
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MII_88E1318S_PHY_LED_TCR_FORCE_INT,
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MII_88E1318S_PHY_LED_TCR_INTn_ENABLE | data);
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if (!data) {
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/* Clear interrupts to ensure INTn won't be holded in high state */
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__phy_write(phydev, MII_MARVELL_PHY_PAGE, MII_MARVELL_COPPER_PAGE);
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__phy_read(phydev, MII_M1011_IEVENT);
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/* If WOL was enabled and a magic packet was received before powering
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* off, we won't be able to wake up by sending another magic packet.
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* Clear WOL status.
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*/
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__phy_write(phydev, MII_MARVELL_PHY_PAGE, MII_MARVELL_WOL_PAGE);
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__phy_set_bits(phydev, MII_88E1318S_PHY_WOL_CTRL,
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MII_88E1318S_PHY_WOL_CTRL_CLEAR_WOL_STATUS);
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}
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err:
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rc = phy_restore_page(phydev, saved_page, rc);
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if (rc < 0)
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dev_err(&phydev->mdio.dev, "Write register failed, %d\n", rc);
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}
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static int linkstation_reboot_notifier(struct notifier_block *nb,
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unsigned long action, void *unused)
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{
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if (action == SYS_RESTART)
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mvphy_reg_intn(MII_88E1318S_PHY_LED_TCR_FORCE_INT);
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return NOTIFY_DONE;
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}
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static struct notifier_block linkstation_reboot_nb = {
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.notifier_call = linkstation_reboot_notifier,
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};
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static void linkstation_poweroff(void)
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{
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unregister_reboot_notifier(&linkstation_reboot_nb);
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mvphy_reg_intn(0);
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kernel_restart("Power off");
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}
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static const struct of_device_id ls_poweroff_of_match[] = {
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{ .compatible = "buffalo,ls421d" },
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{ .compatible = "buffalo,ls421de" },
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{ },
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};
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static int __init linkstation_poweroff_init(void)
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{
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struct mii_bus *bus;
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struct device_node *dn;
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dn = of_find_matching_node(NULL, ls_poweroff_of_match);
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if (!dn)
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return -ENODEV;
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of_node_put(dn);
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dn = of_find_node_by_name(NULL, "mdio");
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if (!dn)
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return -ENODEV;
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bus = of_mdio_find_bus(dn);
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of_node_put(dn);
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if (!bus)
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return -EPROBE_DEFER;
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phydev = phy_find_first(bus);
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put_device(&bus->dev);
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if (!phydev)
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return -EPROBE_DEFER;
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register_reboot_notifier(&linkstation_reboot_nb);
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pm_power_off = linkstation_poweroff;
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return 0;
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}
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static void __exit linkstation_poweroff_exit(void)
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{
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pm_power_off = NULL;
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unregister_reboot_notifier(&linkstation_reboot_nb);
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}
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module_init(linkstation_poweroff_init);
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module_exit(linkstation_poweroff_exit);
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MODULE_AUTHOR("Daniel González Cabanelas <dgcbueu@gmail.com>");
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MODULE_DESCRIPTION("LinkStation power off driver");
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MODULE_LICENSE("GPL v2");
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