kernel: generic: backport linkstation-poweroff driver

Linkstation poweroff driver was added to mvebu target, but is required
for kirkwood target too.
This commit make two changes:
- move linkstation-poweroff support patch from mvebu to generic and
replace upstream accepted version
- backport small linkstation-poweroff fix from 5.12

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>

4 files changed, 254 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.10/026-power-reset-linkstation-poweroff-add-missing-put_dev.patch b/target/linux/generic/backport-5.10/026-power-reset-linkstation-poweroff-add-missing-put_dev.patch
new file mode 100644
index 0000000000..66e75bf514
--- /dev/null
+++ b/target/linux/generic/backport-5.10/026-power-reset-linkstation-poweroff-add-missing-put_dev.patch
@@ -0,0 +1,27 @@
+From 1027a42c25cbf8cfc4ade6503c5110aae04866af Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Daniel=20Gonz=C3=A1lez=20Cabanelas?= <dgcbueu@gmail.com>
+Date: Fri, 16 Oct 2020 20:22:37 +0200
+Subject: [PATCH] power: reset: linkstation-poweroff: add missing put_device()
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+The of_mdio_find_bus() takes a reference to the underlying device
+structure, we should release that reference using a put_device() call.
+
+Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
+Signed-off-by: Sebastian Reichel <sre@kernel.org>
+---
+ drivers/power/reset/linkstation-poweroff.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/drivers/power/reset/linkstation-poweroff.c
++++ b/drivers/power/reset/linkstation-poweroff.c
+@@ -113,6 +113,7 @@ static int __init linkstation_poweroff_i
+ 		return -EPROBE_DEFER;
+ 
+ 	phydev = phy_find_first(bus);
++	put_device(&bus->dev);
+ 	if (!phydev)
+ 		return -EPROBE_DEFER;
+ 
diff --git a/target/linux/generic/backport-5.4/025-power-reset-add-driver-for-LinkStation-power-off.patch b/target/linux/generic/backport-5.4/025-power-reset-add-driver-for-LinkStation-power-off.patch
new file mode 100644
index 0000000000..7bf48c3405
--- /dev/null
+++ b/target/linux/generic/backport-5.4/025-power-reset-add-driver-for-LinkStation-power-off.patch
@@ -0,0 +1,199 @@
+From a7f79f99541eff4e6bcae0014eb08d3019337565 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Daniel=20Gonz=C3=A1lez=20Cabanelas?= <dgcbueu@gmail.com>
+Date: Wed, 15 Jul 2020 15:35:14 +0200
+Subject: [PATCH] power: reset: add driver for LinkStation power off
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Some Buffalo LinkStations perform the power off operation, at restart
+time, depending on the state of an output pin (LED2/INTn) at the ethernet
+PHY. This pin is also used to wake the machine when a WoL packet is
+received by the PHY.
+
+The driver is required by the Buffalo LinkStation LS421DE (ARM MVEBU),
+and other models. Without it, the board remains forever halted if a
+power off command is executed, unless the PSU is disconnected and
+connected again.
+
+Add the driver to provide the power off function and also make the WoL
+feature to be available.
+
+Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
+Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
+---
+ drivers/power/reset/Kconfig                |  11 ++
+ drivers/power/reset/Makefile               |   1 +
+ drivers/power/reset/linkstation-poweroff.c | 136 +++++++++++++++++++++
+ 3 files changed, 148 insertions(+)
+ create mode 100644 drivers/power/reset/linkstation-poweroff.c
+
+--- a/drivers/power/reset/Kconfig
++++ b/drivers/power/reset/Kconfig
+@@ -99,6 +99,17 @@ config POWER_RESET_HISI
+ 	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-$(CONFIG_POWER_RESET_GEMINI_POWEROFF
+ obj-$(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
+--- /dev/null
++++ b/drivers/power/reset/linkstation-poweroff.c
+@@ -0,0 +1,136 @@
++// 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);
++}
++
++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;
++
++	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");
diff --git a/target/linux/generic/backport-5.4/026-power-reset-linkstation-poweroff-add-missing-put_dev.patch b/target/linux/generic/backport-5.4/026-power-reset-linkstation-poweroff-add-missing-put_dev.patch
new file mode 100644
index 0000000000..66e75bf514
--- /dev/null
+++ b/target/linux/generic/backport-5.4/026-power-reset-linkstation-poweroff-add-missing-put_dev.patch
@@ -0,0 +1,27 @@
+From 1027a42c25cbf8cfc4ade6503c5110aae04866af Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Daniel=20Gonz=C3=A1lez=20Cabanelas?= <dgcbueu@gmail.com>
+Date: Fri, 16 Oct 2020 20:22:37 +0200
+Subject: [PATCH] power: reset: linkstation-poweroff: add missing put_device()
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+The of_mdio_find_bus() takes a reference to the underlying device
+structure, we should release that reference using a put_device() call.
+
+Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
+Signed-off-by: Sebastian Reichel <sre@kernel.org>
+---
+ drivers/power/reset/linkstation-poweroff.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/drivers/power/reset/linkstation-poweroff.c
++++ b/drivers/power/reset/linkstation-poweroff.c
+@@ -113,6 +113,7 @@ static int __init linkstation_poweroff_i
+ 		return -EPROBE_DEFER;
+ 
+ 	phydev = phy_find_first(bus);
++	put_device(&bus->dev);
+ 	if (!phydev)
+ 		return -EPROBE_DEFER;
+ 
diff --git a/target/linux/generic/config-5.4 b/target/linux/generic/config-5.4
index 1b3f896514..6ee1d472db 100644
--- a/target/linux/generic/config-5.4
+++ b/target/linux/generic/config-5.4
@@ -4131,6 +4131,7 @@ CONFIG_POSIX_TIMERS=y
 # CONFIG_POWER_RESET_BRCMSTB is not set
 # CONFIG_POWER_RESET_GPIO is not set
 # CONFIG_POWER_RESET_GPIO_RESTART is not set
+# CONFIG_POWER_RESET_LINKSTATION is not set
 # CONFIG_POWER_RESET_LTC2952 is not set
 # CONFIG_POWER_RESET_PIIX4_POWEROFF is not set
 # CONFIG_POWER_RESET_RESTART is not set