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137 lines
3.5 KiB
137 lines
3.5 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("LinkStation power off driver"); |
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MODULE_LICENSE("GPL v2");
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