power: reset: Add msm restart support

Add support for restart and poweroff functionality present on MSM chipsets
with the MPM2 ps-hold hardware.

Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
Tested-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>

diff --git a/Documentation/devicetree/bindings/power_supply/msm-poweroff.txt b/Documentation/devicetree/bindings/power_supply/msm-poweroff.txt
new file mode 100644 (file)
index 0000000..ce44ad3
--- /dev/null
+++ b/Documentation/devicetree/bindings/power_supply/msm-poweroff.txt
@@ -0,0 +1,17 @@
+MSM Restart Driver
+
+A power supply hold (ps-hold) bit is set to power the msm chipsets.
+Clearing that bit allows us to restart/poweroff. The difference
+between poweroff and restart is determined by unique power manager IC
+settings.
+
+Required Properties:
+-compatible: "qcom,pshold"
+-reg: Specifies the physical address of the ps-hold register
+
+Example:
+
+       restart@fc4ab000 {
+               compatible = "qcom,pshold";
+               reg = <0xfc4ab000 0x4>;
+       };

diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index ee039dc..9412290 100644 (file)
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -14,6 +14,12 @@ config POWER_RESET_GPIO
          If your board needs a GPIO high/low to power down, say Y and
          create a binding in your devicetree.
 
+config POWER_RESET_MSM
+       bool "Qualcomm MSM power-off driver"
+       depends on POWER_RESET && ARCH_MSM
+       help
+         Power off and restart support for Qualcomm boards.
+
 config POWER_RESET_QNAP
        bool "QNAP power-off driver"
        depends on OF_GPIO && POWER_RESET && PLAT_ORION

diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index 372807f..b82288e 100644 (file)
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -1,4 +1,5 @@
 obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
+obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
 obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
 obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o
 obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o

diff --git a/drivers/power/reset/msm-poweroff.c b/drivers/power/reset/msm-poweroff.c
new file mode 100644 (file)
index 0000000..774f9a3
--- /dev/null
+++ b/drivers/power/reset/msm-poweroff.c
@@ -0,0 +1,73 @@
+/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/reboot.h>
+
+#include <asm/system_misc.h>
+
+static void __iomem *msm_ps_hold;
+
+static void do_msm_restart(enum reboot_mode reboot_mode, const char *cmd)
+{
+       writel(0, msm_ps_hold);
+       mdelay(10000);
+}
+
+static void do_msm_poweroff(void)
+{
+       /* TODO: Add poweroff capability */
+       do_msm_restart(REBOOT_HARD, NULL);
+}
+
+static int msm_restart_probe(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+       struct resource *mem;
+
+       mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       msm_ps_hold = devm_ioremap_resource(dev, mem);
+       if (IS_ERR(msm_ps_hold))
+               return PTR_ERR(msm_ps_hold);
+
+       pm_power_off = do_msm_poweroff;
+       arm_pm_restart = do_msm_restart;
+       return 0;
+}
+
+static const struct of_device_id of_msm_restart_match[] = {
+       { .compatible = "qcom,pshold", },
+       {},
+};
+MODULE_DEVICE_TABLE(of, of_msm_restart_match);
+
+static struct platform_driver msm_restart_driver = {
+       .probe = msm_restart_probe,
+       .driver = {
+               .name = "msm-restart",
+               .of_match_table = of_match_ptr(of_msm_restart_match),
+       },
+};
+
+static int __init msm_restart_init(void)
+{
+       return platform_driver_register(&msm_restart_driver);
+}
+device_initcall(msm_restart_init);