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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: Daniel González Cabanelas <dgcbueu@gmail.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
136 lines
3.5 KiB
C
136 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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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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