power: reset: imx-snvs-poweroff: add power off driver for i.mx6
This driver register pm_power_off with snvs power off function. If
your boards NOT use PMIC_ON_REQ to turn on/off external pmic, or use
other pin to do, please disable the driver in dts, otherwise, your
pm_power_off maybe overwrote by this driver.
Signed-off-by: Robin Gong <b38343@freescale.com>
Acked-By: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
diff --git a/drivers/power/reset/imx-snvs-poweroff.c b/drivers/power/reset/imx-snvs-poweroff.c
new file mode 100644
index 0000000..ad6ce50
--- /dev/null
+++ b/drivers/power/reset/imx-snvs-poweroff.c
@@ -0,0 +1,66 @@
+/* Power off driver for i.mx6
+ * Copyright (c) 2014, FREESCALE CORPORATION. All rights reserved.
+ *
+ * based on msm-poweroff.c
+ *
+ * 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/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+
+static void __iomem *snvs_base;
+
+static void do_imx_poweroff(void)
+{
+ u32 value = readl(snvs_base);
+
+ /* set TOP and DP_EN bit */
+ writel(value | 0x60, snvs_base);
+}
+
+static int imx_poweroff_probe(struct platform_device *pdev)
+{
+ snvs_base = of_iomap(pdev->dev.of_node, 0);
+ if (!snvs_base) {
+ dev_err(&pdev->dev, "failed to get memory\n");
+ return -ENODEV;
+ }
+
+ pm_power_off = do_imx_poweroff;
+ return 0;
+}
+
+static const struct of_device_id of_imx_poweroff_match[] = {
+ { .compatible = "fsl,sec-v4.0-poweroff", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, of_imx_poweroff_match);
+
+static struct platform_driver imx_poweroff_driver = {
+ .probe = imx_poweroff_probe,
+ .driver = {
+ .name = "imx-snvs-poweroff",
+ .of_match_table = of_match_ptr(of_imx_poweroff_match),
+ },
+};
+
+static int __init imx_poweroff_init(void)
+{
+ return platform_driver_register(&imx_poweroff_driver);
+}
+device_initcall(imx_poweroff_init);