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mvebu: backport linkstation-poweroff upstream driver
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
Daniel Golle
parent
09faa73c53
commit
59c200ca0a
21
target/linux/mvebu/modules.mk
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21
target/linux/mvebu/modules.mk
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@ -0,0 +1,21 @@
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define KernelPackage/linkstation-poweroff
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SUBMENU:=$(OTHER_MENU)
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DEPENDS:=@TARGET_mvebu
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TITLE:=Buffalo LinkStation power off driver
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KCONFIG:= \
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CONFIG_POWER_RESET=y \
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CONFIG_POWER_RESET_LINKSTATION \
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CONFIG_POWER_RESET_QNAP=n
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FILES:=$(LINUX_DIR)/drivers/power/reset/linkstation-poweroff.ko
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AUTOLOAD:=$(call AutoLoad,31,linkstation-poweroff,1)
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endef
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define KernelPackage/linkstation-poweroff/description
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This driver supports turning off some Buffalo LinkStations by
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setting an output pin at the ethernet PHY to the correct state.
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It also makes the device compatible with the WoL function.
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Say Y here if you have a Buffalo LinkStation LS421D/E.
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endef
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$(eval $(call KernelPackage,linkstation-poweroff))
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177
target/linux/mvebu/patches-5.4/030-linkstation-poweroff.patch
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177
target/linux/mvebu/patches-5.4/030-linkstation-poweroff.patch
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@ -0,0 +1,177 @@
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--- a/drivers/power/reset/Kconfig
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+++ b/drivers/power/reset/Kconfig
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@@ -99,6 +99,17 @@
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help
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Reboot support for Hisilicon boards.
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+config POWER_RESET_LINKSTATION
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+ tristate "Buffalo LinkStation power-off driver"
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+ depends on ARCH_MVEBU || COMPILE_TEST
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+ depends on OF_MDIO && PHYLIB
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+ help
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+ This driver supports turning off some Buffalo LinkStations by
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+ setting an output pin at the ethernet PHY to the correct state.
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+ It also makes the device compatible with the WoL function.
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+
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+ Say Y here if you have a Buffalo LinkStation LS421D/E.
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+
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config POWER_RESET_MSM
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bool "Qualcomm MSM power-off driver"
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depends on ARCH_QCOM
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--- a/drivers/power/reset/Makefile
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+++ b/drivers/power/reset/Makefile
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@@ -10,6 +10,7 @@
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obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
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obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
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obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
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+obj-${CONFIG_POWER_RESET_LINKSTATION} += linkstation-poweroff.o
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obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
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obj-$(CONFIG_POWER_RESET_QCOM_PON) += qcom-pon.o
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obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
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--- a/dev/null
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+++ b/drivers/power/reset/linkstation-poweroff.c
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@@ -0,0 +1,144 @@
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+// 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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+
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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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+
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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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+
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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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+
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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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+
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+static struct phy_device *phydev;
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+ if (!data) {
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+ /* Slow down the PHY to save energy */
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+ rc= phy_speed_down(phydev, false);
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+ if (rc < 0)
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+ dev_err(&phydev->mdio.dev, "PHY speed down failed, %d\n", rc);
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+ }
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+}
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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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+
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+ return NOTIFY_DONE;
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+}
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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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+
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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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+
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+ kernel_restart("Power off");
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+}
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ register_reboot_notifier(&linkstation_reboot_nb);
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+ pm_power_off = linkstation_poweroff;
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+
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+ pr_info("LinkStation power off driver registered\n");
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+ return 0;
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+}
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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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+
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+module_init(linkstation_poweroff_init);
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+module_exit(linkstation_poweroff_exit);
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+
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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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