diff options
Diffstat (limited to 'drivers/power/reset/linkstation-poweroff.c')
| -rw-r--r-- | drivers/power/reset/linkstation-poweroff.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/drivers/power/reset/linkstation-poweroff.c b/drivers/power/reset/linkstation-poweroff.c new file mode 100644 index 000000000..02f5fdb8f --- /dev/null +++ b/drivers/power/reset/linkstation-poweroff.c @@ -0,0 +1,202 @@ +// 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_PHY_LED_POL_CTRL 17 +#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) + +#define MII_88E1318S_PHY_LED_POL_LED2 BIT(4) + +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 void readynas_mvphy_set_reg(bool restart) +{ + int rc = 0, saved_page; + u16 data = 0; + + if (restart) + data = MII_88E1318S_PHY_LED_POL_LED2; + + saved_page = phy_select_page(phydev, MII_MARVELL_LED_PAGE); + if (saved_page < 0) + goto err; + + /* Set the LED[2].0 Polarity bit to the required state */ + __phy_modify(phydev, MII_PHY_LED_POL_CTRL, + MII_88E1318S_PHY_LED_POL_LED2, data); + + if (!data) { + /* 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 const struct power_off_cfg readynas_power_off_cfg = { + .mdio_node_name = "mdio-bus", + .phy_set_reg = readynas_mvphy_set_reg, +}; + +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, + }, + { .compatible = "netgear,readynas-duo-v2", + .data = &readynas_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"); |