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mvebu: backport linkstation-poweroff upstream driver

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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@gmail.com>
This commit is contained in:
Daniel González Cabanelas 2020-08-28 11:20:36 +02:00 committed by Daniel Golle
parent 09faa73c53
commit 59c200ca0a
2 changed files with 198 additions and 0 deletions
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21
target/linux/mvebu/modules.mk Normal file
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@ -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))

177
target/linux/mvebu/patches-5.4/030-linkstation-poweroff.patch Normal file
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@ -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@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@gmail.com>");
+MODULE_DESCRIPTION("LinkStation power off driver");
+MODULE_LICENSE("GPL v2");