[PATCH v2 1/2] mvebu: backport linkstation-poweroff upstream driver
Daniel González Cabanelas
dgcbueu at gmail.com
Fri Aug 28 05:20:36 EDT 2020
Backport the Linkstation poweroff driver from the kernel upstream (commit
a7f79f99541ef)
This driver is required by the Buffalo LinkStation LS421DE for a correct
power off operation. It also allows to use the WoL feature.
Signed-off-by: Daniel González Cabanelas <dgcbueu at gmail.com>
---
changes in v2
- module moved to the mvebu target
target/linux/mvebu/modules.mk | 21 +++
.../030-linkstation-poweroff.patch | 177 ++++++++++++++++++
2 files changed, 198 insertions(+)
create mode 100644 target/linux/mvebu/modules.mk
create mode 100644 target/linux/mvebu/patches-5.4/030-linkstation-poweroff.patch
diff --git a/target/linux/mvebu/modules.mk b/target/linux/mvebu/modules.mk
new file mode 100644
index 0000000000..3a5e316788
--- /dev/null
+++ b/target/linux/mvebu/modules.mk
@@ -0,0 +1,21 @@
+define KernelPackage/linkstation-poweroff
+ SUBMENU:=$(OTHER_MENU)
+ DEPENDS:=@TARGET_mvebu
+ TITLE:=Buffalo LinkStation power off driver
+ KCONFIG:= \
+ CONFIG_POWER_RESET=y \
+ CONFIG_POWER_RESET_LINKSTATION \
+ CONFIG_POWER_RESET_QNAP=n
+
+ FILES:=$(LINUX_DIR)/drivers/power/reset/linkstation-poweroff.ko
+ AUTOLOAD:=$(call AutoLoad,31,linkstation-poweroff,1)
+endef
+
+define KernelPackage/linkstation-poweroff/description
+ This driver supports turning off some Buffalo LinkStations by
+ setting an output pin at the ethernet PHY to the correct state.
+ It also makes the device compatible with the WoL function.
+ Say Y here if you have a Buffalo LinkStation LS421D/E.
+endef
+
+$(eval $(call KernelPackage,linkstation-poweroff))
diff --git a/target/linux/mvebu/patches-5.4/030-linkstation-poweroff.patch b/target/linux/mvebu/patches-5.4/030-linkstation-poweroff.patch
new file mode 100644
index 0000000000..e4dee5c09e
--- /dev/null
+++ b/target/linux/mvebu/patches-5.4/030-linkstation-poweroff.patch
@@ -0,0 +1,177 @@
+--- a/drivers/power/reset/Kconfig
++++ b/drivers/power/reset/Kconfig
+@@ -99,6 +99,17 @@
+ help
+ Reboot support for Hisilicon boards.
+
++config POWER_RESET_LINKSTATION
++ tristate "Buffalo LinkStation power-off driver"
++ depends on ARCH_MVEBU || COMPILE_TEST
++ depends on OF_MDIO && PHYLIB
++ help
++ This driver supports turning off some Buffalo LinkStations by
++ setting an output pin at the ethernet PHY to the correct state.
++ It also makes the device compatible with the WoL function.
++
++ Say Y here if you have a Buffalo LinkStation LS421D/E.
++
+ config POWER_RESET_MSM
+ bool "Qualcomm MSM power-off driver"
+ depends on ARCH_QCOM
+--- a/drivers/power/reset/Makefile
++++ b/drivers/power/reset/Makefile
+@@ -10,6 +10,7 @@
+ obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
+ obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
+ obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
++obj-${CONFIG_POWER_RESET_LINKSTATION} += linkstation-poweroff.o
+ obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
+ obj-$(CONFIG_POWER_RESET_QCOM_PON) += qcom-pon.o
+ obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
+--- a/dev/null
++++ b/drivers/power/reset/linkstation-poweroff.c
+@@ -0,0 +1,144 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * LinkStation power off restart driver
++ * Copyright (C) 2020 Daniel González Cabanelas <dgcbueu at 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);
++
++ if (!data) {
++ /* Slow down the PHY to save energy */
++ rc= phy_speed_down(phydev, false);
++ if (rc < 0)
++ dev_err(&phydev->mdio.dev, "PHY speed down 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;
++
++ pr_info("LinkStation power off driver registered\n");
++ 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 at gmail.com>");
++MODULE_DESCRIPTION("LinkStation power off driver");
++MODULE_LICENSE("GPL v2");
--
2.28.0
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