These changes are the raw update to linux-4.4.6-rt14. Kernel sources

are taken from kernel.org, and rt patch from the rt wiki download page.

During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

9 files changed, 180 insertions, 79 deletions

diff --git a/kernel/drivers/power/reset/Kconfig b/kernel/drivers/power/reset/Kconfig
index 17d93a73c..1131cf75a 100644
--- a/kernel/drivers/power/reset/Kconfig
+++ b/kernel/drivers/power/reset/Kconfig
@@ -15,7 +15,7 @@ config POWER_RESET_AS3722
 	  This driver supports turning off board via a ams AS3722 power-off.
 
 config POWER_RESET_AT91_POWEROFF
-	bool "Atmel AT91 poweroff driver"
+	tristate "Atmel AT91 poweroff driver"
 	depends on ARCH_AT91
 	default SOC_AT91SAM9 || SOC_SAMA5
 	help
@@ -23,7 +23,7 @@ config POWER_RESET_AT91_POWEROFF
 	  SoCs
 
 config POWER_RESET_AT91_RESET
-	bool "Atmel AT91 reset driver"
+	tristate "Atmel AT91 reset driver"
 	depends on ARCH_AT91
 	default SOC_AT91SAM9 || SOC_SAMA5
 	help
@@ -166,5 +166,12 @@ config POWER_RESET_RMOBILE
 	help
 	  Reboot support for Renesas R-Mobile and SH-Mobile SoCs.
 
+config POWER_RESET_ZX
+	tristate "ZTE SoCs reset driver"
+	depends on ARCH_ZX || COMPILE_TEST
+	depends on HAS_IOMEM
+	help
+	  Reboot support for ZTE SoCs.
+
 endif
 
diff --git a/kernel/drivers/power/reset/Makefile b/kernel/drivers/power/reset/Makefile
index dbe06c368..096fa6704 100644
--- a/kernel/drivers/power/reset/Makefile
+++ b/kernel/drivers/power/reset/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_POWER_RESET_KEYSTONE) += keystone-reset.o
 obj-$(CONFIG_POWER_RESET_SYSCON) += syscon-reboot.o
 obj-$(CONFIG_POWER_RESET_SYSCON_POWEROFF) += syscon-poweroff.o
 obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o
+obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o
diff --git a/kernel/drivers/power/reset/at91-poweroff.c b/kernel/drivers/power/reset/at91-poweroff.c
index 9847cfb7e..e9e24df35 100644
--- a/kernel/drivers/power/reset/at91-poweroff.c
+++ b/kernel/drivers/power/reset/at91-poweroff.c
@@ -10,6 +10,7 @@
  * warranty of any kind, whether express or implied.
  */
 
+#include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -48,6 +49,7 @@ static const char *shdwc_wakeup_modes[] = {
 };
 
 static void __iomem *at91_shdwc_base;
+static struct clk *sclk;
 
 static void __init at91_wakeup_status(void)
 {
@@ -119,9 +121,10 @@ static void at91_poweroff_dt_set_wakeup_mode(struct platform_device *pdev)
 	writel(wakeup_mode | mode, at91_shdwc_base + AT91_SHDW_MR);
 }
 
-static int at91_poweroff_probe(struct platform_device *pdev)
+static int __init at91_poweroff_probe(struct platform_device *pdev)
 {
 	struct resource *res;
+	int ret;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	at91_shdwc_base = devm_ioremap_resource(&pdev->dev, res);
@@ -130,6 +133,16 @@ static int at91_poweroff_probe(struct platform_device *pdev)
 		return PTR_ERR(at91_shdwc_base);
 	}
 
+	sclk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(sclk))
+		return PTR_ERR(sclk);
+
+	ret = clk_prepare_enable(sclk);
+	if (ret) {
+		dev_err(&pdev->dev, "Could not enable slow clock\n");
+		return ret;
+	}
+
 	at91_wakeup_status();
 
 	if (pdev->dev.of_node)
@@ -140,6 +153,16 @@ static int at91_poweroff_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static int __exit at91_poweroff_remove(struct platform_device *pdev)
+{
+	if (pm_power_off == at91_poweroff)
+		pm_power_off = NULL;
+
+	clk_disable_unprepare(sclk);
+
+	return 0;
+}
+
 static const struct of_device_id at91_poweroff_of_match[] = {
 	{ .compatible = "atmel,at91sam9260-shdwc", },
 	{ .compatible = "atmel,at91sam9rl-shdwc", },
@@ -148,10 +171,14 @@ static const struct of_device_id at91_poweroff_of_match[] = {
 };
 
 static struct platform_driver at91_poweroff_driver = {
-	.probe = at91_poweroff_probe,
+	.remove = __exit_p(at91_poweroff_remove),
 	.driver = {
 		.name = "at91-poweroff",
 		.of_match_table = at91_poweroff_of_match,
 	},
 };
-module_platform_driver(at91_poweroff_driver);
+module_platform_driver_probe(at91_poweroff_driver, at91_poweroff_probe);
+
+MODULE_AUTHOR("Atmel Corporation");
+MODULE_DESCRIPTION("Shutdown driver for Atmel SoCs");
+MODULE_LICENSE("GPL v2");
diff --git a/kernel/drivers/power/reset/at91-reset.c b/kernel/drivers/power/reset/at91-reset.c
index ca461ebc7..3f6b5dd7c 100644
--- a/kernel/drivers/power/reset/at91-reset.c
+++ b/kernel/drivers/power/reset/at91-reset.c
@@ -1,5 +1,5 @@
 /*
- * Atmel AT91 SAM9 SoCs reset code
+ * Atmel AT91 SAM9 & SAMA5 SoCs reset code
  *
  * Copyright (C) 2007 Atmel Corporation.
  * Copyright (C) BitBox Ltd 2010
@@ -11,6 +11,7 @@
  * warranty of any kind, whether express or implied.
  */
 
+#include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
@@ -46,6 +47,7 @@ enum reset_type {
 };
 
 static void __iomem *at91_ramc_base[2], *at91_rstc_base;
+static struct clk *sclk;
 
 /*
 * unless the SDRAM is cleanly shutdown before we hit the
@@ -123,6 +125,15 @@ static int at91sam9g45_restart(struct notifier_block *this, unsigned long mode,
 	return NOTIFY_DONE;
 }
 
+static int sama5d3_restart(struct notifier_block *this, unsigned long mode,
+			   void *cmd)
+{
+	writel(cpu_to_le32(AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST),
+	       at91_rstc_base);
+
+	return NOTIFY_DONE;
+}
+
 static void __init at91_reset_status(struct platform_device *pdev)
 {
 	u32 reg = readl(at91_rstc_base + AT91_RSTC_SR);
@@ -155,13 +166,13 @@ static void __init at91_reset_status(struct platform_device *pdev)
 static const struct of_device_id at91_ramc_of_match[] = {
 	{ .compatible = "atmel,at91sam9260-sdramc", },
 	{ .compatible = "atmel,at91sam9g45-ddramc", },
-	{ .compatible = "atmel,sama5d3-ddramc", },
 	{ /* sentinel */ }
 };
 
 static const struct of_device_id at91_reset_of_match[] = {
 	{ .compatible = "atmel,at91sam9260-rstc", .data = at91sam9260_restart },
 	{ .compatible = "atmel,at91sam9g45-rstc", .data = at91sam9g45_restart },
+	{ .compatible = "atmel,sama5d3-rstc", .data = sama5d3_restart },
 	{ /* sentinel */ }
 };
 
@@ -169,11 +180,11 @@ static struct notifier_block at91_restart_nb = {
 	.priority = 192,
 };
 
-static int at91_reset_of_probe(struct platform_device *pdev)
+static int __init at91_reset_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *match;
 	struct device_node *np;
-	int idx = 0;
+	int ret, idx = 0;
 
 	at91_rstc_base = of_iomap(pdev->dev.of_node, 0);
 	if (!at91_rstc_base) {
@@ -181,80 +192,66 @@ static int at91_reset_of_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	for_each_matching_node(np, at91_ramc_of_match) {
-		at91_ramc_base[idx] = of_iomap(np, 0);
-		if (!at91_ramc_base[idx]) {
-			dev_err(&pdev->dev, "Could not map ram controller address\n");
-			return -ENODEV;
+	if (!of_device_is_compatible(pdev->dev.of_node, "atmel,sama5d3-rstc")) {
+		/* we need to shutdown the ddr controller, so get ramc base */
+		for_each_matching_node(np, at91_ramc_of_match) {
+			at91_ramc_base[idx] = of_iomap(np, 0);
+			if (!at91_ramc_base[idx]) {
+				dev_err(&pdev->dev, "Could not map ram controller address\n");
+				return -ENODEV;
+			}
+			idx++;
 		}
-		idx++;
 	}
 
 	match = of_match_node(at91_reset_of_match, pdev->dev.of_node);
 	at91_restart_nb.notifier_call = match->data;
-	return register_restart_handler(&at91_restart_nb);
-}
 
-static int at91_reset_platform_probe(struct platform_device *pdev)
-{
-	const struct platform_device_id *match;
-	struct resource *res;
-	int idx = 0;
+	sclk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(sclk))
+		return PTR_ERR(sclk);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	at91_rstc_base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(at91_rstc_base)) {
-		dev_err(&pdev->dev, "Could not map reset controller address\n");
-		return PTR_ERR(at91_rstc_base);
+	ret = clk_prepare_enable(sclk);
+	if (ret) {
+		dev_err(&pdev->dev, "Could not enable slow clock\n");
+		return ret;
 	}
 
-	for (idx = 0; idx < 2; idx++) {
-		res = platform_get_resource(pdev, IORESOURCE_MEM, idx + 1 );
-		at91_ramc_base[idx] = devm_ioremap(&pdev->dev, res->start,
-						   resource_size(res));
-		if (!at91_ramc_base[idx]) {
-			dev_err(&pdev->dev, "Could not map ram controller address\n");
-			return -ENOMEM;
-		}
+	ret = register_restart_handler(&at91_restart_nb);
+	if (ret) {
+		clk_disable_unprepare(sclk);
+		return ret;
 	}
 
-	match = platform_get_device_id(pdev);
-	at91_restart_nb.notifier_call =
-		(int (*)(struct notifier_block *,
-			 unsigned long, void *)) match->driver_data;
+	at91_reset_status(pdev);
 
-	return register_restart_handler(&at91_restart_nb);
+	return 0;
 }
 
-static int at91_reset_probe(struct platform_device *pdev)
+static int __exit at91_reset_remove(struct platform_device *pdev)
 {
-	int ret;
-
-	if (pdev->dev.of_node)
-		ret = at91_reset_of_probe(pdev);
-	else
-		ret = at91_reset_platform_probe(pdev);
-
-	if (ret)
-		return ret;
-
-	at91_reset_status(pdev);
+	unregister_restart_handler(&at91_restart_nb);
+	clk_disable_unprepare(sclk);
 
 	return 0;
 }
 
-static struct platform_device_id at91_reset_plat_match[] = {
+static const struct platform_device_id at91_reset_plat_match[] = {
 	{ "at91-sam9260-reset", (unsigned long)at91sam9260_restart },
 	{ "at91-sam9g45-reset", (unsigned long)at91sam9g45_restart },
 	{ /* sentinel */ }
 };
 
 static struct platform_driver at91_reset_driver = {
-	.probe = at91_reset_probe,
+	.remove = __exit_p(at91_reset_remove),
 	.driver = {
 		.name = "at91-reset",
 		.of_match_table = at91_reset_of_match,
 	},
 	.id_table = at91_reset_plat_match,
 };
-module_platform_driver(at91_reset_driver);
+module_platform_driver_probe(at91_reset_driver, at91_reset_probe);
+
+MODULE_AUTHOR("Atmel Corporation");
+MODULE_DESCRIPTION("Reset driver for Atmel SoCs");
+MODULE_LICENSE("GPL v2");
diff --git a/kernel/drivers/power/reset/gpio-poweroff.c b/kernel/drivers/power/reset/gpio-poweroff.c
index e5332f1db..be3d81ff5 100644
--- a/kernel/drivers/power/reset/gpio-poweroff.c
+++ b/kernel/drivers/power/reset/gpio-poweroff.c
@@ -48,6 +48,7 @@ static void gpio_poweroff_do_poweroff(void)
 static int gpio_poweroff_probe(struct platform_device *pdev)
 {
 	bool input = false;
+	enum gpiod_flags flags;
 
 	/* If a pm_power_off function has already been added, leave it alone */
 	if (pm_power_off != NULL) {
@@ -57,25 +58,15 @@ static int gpio_poweroff_probe(struct platform_device *pdev)
 		return -EBUSY;
 	}
 
-	reset_gpio = devm_gpiod_get(&pdev->dev, NULL);
-	if (IS_ERR(reset_gpio))
-		return PTR_ERR(reset_gpio);
-
 	input = of_property_read_bool(pdev->dev.of_node, "input");
+	if (input)
+		flags = GPIOD_IN;
+	else
+		flags = GPIOD_OUT_LOW;
 
-	if (input) {
-		if (gpiod_direction_input(reset_gpio)) {
-			dev_err(&pdev->dev,
-				"Could not set direction of reset GPIO to input\n");
-			return -ENODEV;
-		}
-	} else {
-		if (gpiod_direction_output(reset_gpio, 0)) {
-			dev_err(&pdev->dev,
-				"Could not set direction of reset GPIO\n");
-			return -ENODEV;
-		}
-	}
+	reset_gpio = devm_gpiod_get(&pdev->dev, NULL, flags);
+	if (IS_ERR(reset_gpio))
+		return PTR_ERR(reset_gpio);
 
 	pm_power_off = &gpio_poweroff_do_poweroff;
 	return 0;
diff --git a/kernel/drivers/power/reset/gpio-restart.c b/kernel/drivers/power/reset/gpio-restart.c
index edb327efe..829b45f42 100644
--- a/kernel/drivers/power/reset/gpio-restart.c
+++ b/kernel/drivers/power/reset/gpio-restart.c
@@ -78,7 +78,7 @@ static int gpio_restart_probe(struct platform_device *pdev)
 	}
 
 	gpio_restart->restart_handler.notifier_call = gpio_restart_notify;
-	gpio_restart->restart_handler.priority = 128;
+	gpio_restart->restart_handler.priority = 129;
 	gpio_restart->active_delay_ms = 100;
 	gpio_restart->inactive_delay_ms = 100;
 	gpio_restart->wait_delay_ms = 3000;
diff --git a/kernel/drivers/power/reset/ltc2952-poweroff.c b/kernel/drivers/power/reset/ltc2952-poweroff.c
index 1e0819555..15fed9d8f 100644
--- a/kernel/drivers/power/reset/ltc2952-poweroff.c
+++ b/kernel/drivers/power/reset/ltc2952-poweroff.c
@@ -158,7 +158,6 @@ static irqreturn_t ltc2952_poweroff_handler(int irq, void *dev_id)
 			      HRTIMER_MODE_REL);
 	} else {
 		hrtimer_cancel(&data->timer_trigger);
-		/* omitting return value check, timer should have been valid */
 	}
 	return IRQ_HANDLED;
 }
@@ -202,16 +201,15 @@ static int ltc2952_poweroff_init(struct platform_device *pdev)
 		return ret;
 	}
 
-	data->gpio_trigger = devm_gpiod_get(&pdev->dev, "trigger", GPIOD_IN);
+	data->gpio_trigger = devm_gpiod_get_optional(&pdev->dev, "trigger",
+						     GPIOD_IN);
 	if (IS_ERR(data->gpio_trigger)) {
 		/*
 		 * It's not a problem if the trigger gpio isn't available, but
 		 * it is worth a warning if its use was defined in the device
 		 * tree.
 		 */
-		if (PTR_ERR(data->gpio_trigger) != -ENOENT)
-			dev_err(&pdev->dev,
-				"unable to claim gpio \"trigger\"\n");
+		dev_err(&pdev->dev, "unable to claim gpio \"trigger\"\n");
 		data->gpio_trigger = NULL;
 	}
 
diff --git a/kernel/drivers/power/reset/syscon-reboot.c b/kernel/drivers/power/reset/syscon-reboot.c
index d3c7d245a..7d0d269a0 100644
--- a/kernel/drivers/power/reset/syscon-reboot.c
+++ b/kernel/drivers/power/reset/syscon-reboot.c
@@ -88,4 +88,4 @@ static struct platform_driver syscon_reboot_driver = {
 		.of_match_table = syscon_reboot_of_match,
 	},
 };
-module_platform_driver(syscon_reboot_driver);
+builtin_platform_driver(syscon_reboot_driver);
diff --git a/kernel/drivers/power/reset/zx-reboot.c b/kernel/drivers/power/reset/zx-reboot.c
new file mode 100644
index 000000000..a5b009673
--- /dev/null
+++ b/kernel/drivers/power/reset/zx-reboot.c
@@ -0,0 +1,80 @@
+/*
+ * ZTE zx296702 SoC reset code
+ *
+ * Copyright (c) 2015 Linaro Ltd.
+ *
+ * Author: Jun Nie <jun.nie@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+
+static void __iomem *base;
+static void __iomem *pcu_base;
+
+static int zx_restart_handler(struct notifier_block *this,
+			      unsigned long mode, void *cmd)
+{
+	writel_relaxed(1, base + 0xb0);
+	writel_relaxed(1, pcu_base + 0x34);
+
+	mdelay(50);
+	pr_emerg("Unable to restart system\n");
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block zx_restart_nb = {
+	.notifier_call = zx_restart_handler,
+	.priority = 128,
+};
+
+static int zx_reboot_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	int err;
+
+	base = of_iomap(np, 0);
+	if (!base) {
+		WARN(1, "failed to map base address");
+		return -ENODEV;
+	}
+
+	np = of_find_compatible_node(NULL, NULL, "zte,zx296702-pcu");
+	pcu_base = of_iomap(np, 0);
+	if (!pcu_base) {
+		iounmap(base);
+		WARN(1, "failed to map pcu_base address");
+		return -ENODEV;
+	}
+
+	err = register_restart_handler(&zx_restart_nb);
+	if (err)
+		dev_err(&pdev->dev, "Register restart handler failed(err=%d)\n",
+			err);
+
+	return err;
+}
+
+static const struct of_device_id zx_reboot_of_match[] = {
+	{ .compatible = "zte,sysctrl" },
+	{}
+};
+
+static struct platform_driver zx_reboot_driver = {
+	.probe = zx_reboot_probe,
+	.driver = {
+		.name = "zx-reboot",
+		.of_match_table = zx_reboot_of_match,
+	},
+};
+module_platform_driver(zx_reboot_driver);