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/drivers/power/reset/msm-poweroff.c b/drivers/power/reset/msm-poweroff.c
new file mode 100644
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);