Add sram-reboot-mode driver, which enables
reboot modes to be specified from sram subnodes.
Cc: Andy Yan <andy.yan@xxxxxxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Thierry Reding <treding@xxxxxxxxxx>
Cc: Heiko Stübner <heiko@xxxxxxxxx>
Cc: Caesar Wang <wxt@xxxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Guodong Xu <guodong.xu@xxxxxxxxxx>
Cc: Haojian Zhuang <haojian.zhuang@xxxxxxxxxx>
Cc: Vishal Bhoj <vishal.bhoj@xxxxxxxxxx>
Cc: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: Android Kernel Team <kernel-team@xxxxxxxxxxx>
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
drivers/power/reset/Kconfig | 9 +++++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/sram-reboot-mode.c | 66 ++++++++++++++++++++++++++++++++++
3 files changed, 76 insertions(+)
create mode 100644 drivers/power/reset/sram-reboot-mode.c
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index 76a6251..b033922 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -182,5 +182,14 @@ config SYSCON_REBOOT_MODE
register, then the bootloader can read it to take different
action according to the mode.
+config SRAM_REBOOT_MODE
+ bool "Generic SRAM reboot mode driver"
+ select REBOOT_MODE
+ help
+ Say y here will enable reboot mode driver. This will
+ get reboot mode arguments and store it in an SRAM
+ address, then the bootloader can read it to take different
+ action according to the mode.
+
endif
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index afd05e9..4780f20 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -21,4 +21,5 @@ obj-$(CONFIG_POWER_RESET_SYSCON_POWEROFF) += syscon-poweroff.o
obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o
obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o
obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o
+obj-$(CONFIG_SRAM_REBOOT_MODE) += sram-reboot-mode.o
diff --git a/drivers/power/reset/sram-reboot-mode.c b/drivers/power/reset/sram-reboot-mode.c
new file mode 100644
index 0000000..065c3a8
--- /dev/null
+++ b/drivers/power/reset/sram-reboot-mode.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2016, Linaro Limited
+ * Based on syscon-reboot-mode.c
+ * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+#include "reboot-mode.h"
+
+static void __iomem *reboot_reason_val_addr;
+
+static int sram_reboot_mode_write(int magic)
+{
+ writel(magic, reboot_reason_val_addr);
+ return 0;
+}
+
+static int sram_reboot_mode_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return PTR_ERR(res);
+
+ reboot_reason_val_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (IS_ERR(reboot_reason_val_addr))
+ return PTR_ERR(reboot_reason_val_addr);
+
+ ret = reboot_mode_register(&pdev->dev, sram_reboot_mode_write);
+ if (ret)
+ dev_err(&pdev->dev, "can't register reboot mode\n");
+
+ return ret;
+}
+
+static const struct of_device_id sram_reboot_mode_of_match[] = {
+ { .compatible = "sram-reboot-mode" },
+ {}
+};
+
+static struct platform_driver sram_reboot_mode_driver = {
+ .probe = sram_reboot_mode_probe,
+ .driver = {
+ .name = "sram-reboot-mode",
+ .of_match_table = sram_reboot_mode_of_match,
+ },
+};
+module_platform_driver(sram_reboot_mode_driver);
+
+MODULE_AUTHOR("John Stultz <john.stultz@xxxxxxxxxx>");
+MODULE_DESCRIPTION("SRAM reboot mode driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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