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Message-Id: <1406861157-29169-2-git-send-email-fkan@apm.com>
Date: Thu, 31 Jul 2014 19:45:52 -0700
From: Feng Kan <fkan@....com>
To: linux@...ck-us.net, dbaryshkov@...il.com, catalin.marinas@....com,
dwmw2@...radead.org, arnd@...db.de, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
patches@....com
Cc: Feng Kan <fkan@....com>
Subject: [PATCH V9 1/6] power: reset: Add generic SYSCON register mapped reset
Add a generic SYSCON register mapped reset mechanism.
Signed-off-by: Feng Kan <fkan@....com>
---
drivers/power/reset/Kconfig | 5 ++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/syscon-reboot.c | 98 +++++++++++++++++++++++++++++++++++++
3 files changed, 104 insertions(+)
create mode 100644 drivers/power/reset/syscon-reboot.c
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index bdcf517..fd5f9e5 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -80,3 +80,8 @@ config POWER_RESET_KEYSTONE
help
Reboot support for the KEYSTONE SoCs.
+config POWER_RESET_SYSCON
+ bool "Generic SYSCON regmap reset driver"
+ depends on POWER_RESET && MFD_SYSCON && OF
+ help
+ Reboot support for generic SYSCON mapped register reset.
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index dde2e8b..b1b5ab3 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_POWER_RESET_SUN6I) += sun6i-reboot.o
obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o
obj-$(CONFIG_POWER_RESET_XGENE) += xgene-reboot.o
obj-$(CONFIG_POWER_RESET_KEYSTONE) += keystone-reset.o
+obj-$(CONFIG_POWER_RESET_SYSCON) += syscon-reboot.o
diff --git a/drivers/power/reset/syscon-reboot.c b/drivers/power/reset/syscon-reboot.c
new file mode 100644
index 0000000..75d6eae
--- /dev/null
+++ b/drivers/power/reset/syscon-reboot.c
@@ -0,0 +1,98 @@
+/*
+ * Generic Syscon Reboot Driver
+ *
+ * Copyright (c) 2013, Applied Micro Circuits Corporation
+ * Author: Feng Kan <fkan@....com>
+ *
+ * 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.
+ *
+ * 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/io.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/notifier.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+#include <linux/reboot.h>
+
+struct syscon_reboot_context {
+ struct regmap *map;
+ u32 offset;
+ u32 mask;
+ struct notifier_block restart_handler;
+};
+
+static struct syscon_reboot_context *syscon_reboot_ctx;
+
+static int syscon_restart_handle(struct notifier_block *this,
+ unsigned long mode, void *cmd)
+{
+ struct syscon_reboot_context *ctx = syscon_reboot_ctx;
+ unsigned long timeout;
+
+ /* Issue the reboot */
+ if (ctx->map)
+ regmap_write(ctx->map, ctx->offset, ctx->mask);
+
+ timeout = jiffies + HZ;
+ while (time_before(jiffies, timeout))
+ cpu_relax();
+
+ pr_emerg("Unable to restart system\n");
+ return NOTIFY_DONE;
+}
+
+static int syscon_reboot_probe(struct platform_device *pdev)
+{
+ struct syscon_reboot_context *ctx;
+ struct device *dev = &pdev->dev;
+ int err;
+
+ ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx) {
+ dev_err(&pdev->dev, "out of memory for context\n");
+ return -ENOMEM;
+ }
+
+ ctx->map = syscon_regmap_lookup_by_phandle(dev->of_node, "regmap");
+ if (IS_ERR(ctx->map))
+ return PTR_ERR(ctx->map);
+
+ if (of_property_read_u32(pdev->dev.of_node, "offset", &ctx->offset))
+ return -EINVAL;
+
+ if (of_property_read_u32(pdev->dev.of_node, "mask", &ctx->mask))
+ return -EINVAL;
+
+ ctx->restart_handler.notifier_call = syscon_restart_handle;
+ ctx->restart_handler.priority = 128;
+ err = register_restart_handler(&ctx->restart_handler);
+ if (err)
+ dev_err(dev, "can't register restart notifier (err=%d)\n", err);
+
+ syscon_reboot_ctx = ctx;
+
+ return 0;
+}
+
+static struct of_device_id syscon_reboot_of_match[] = {
+ { .compatible = "syscon-reboot" },
+ {}
+};
+
+static struct platform_driver syscon_reboot_driver = {
+ .probe = syscon_reboot_probe,
+ .driver = {
+ .name = "syscon-reboot",
+ .of_match_table = syscon_reboot_of_match,
+ },
+};
+module_platform_driver(syscon_reboot_driver);
--
1.9.1
--
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