185 lines
4.6 KiB
Diff
185 lines
4.6 KiB
Diff
Add a watchdog driver for ARM MPcore processors.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/drivers/watchdog/Kconfig
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+++ b/drivers/watchdog/Kconfig
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@@ -355,6 +355,13 @@ config KS8695_WATCHDOG
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Watchdog timer embedded into KS8695 processor. This will reboot your
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system when the timeout is reached.
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+config MPCORE_WATCHDOG
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+ tristate "MPcore watchdog"
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+ depends on HAVE_ARM_TWD
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+ select WATCHDOG_CORE
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+ help
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+ Watchdog timer embedded into the MPcore system
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+
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config HAVE_S3C2410_WATCHDOG
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bool
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help
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--- a/drivers/watchdog/Makefile
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+++ b/drivers/watchdog/Makefile
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@@ -49,6 +49,7 @@ obj-$(CONFIG_977_WATCHDOG) += wdt977.o
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obj-$(CONFIG_GEMINI_WATCHDOG) += gemini_wdt.o
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obj-$(CONFIG_IXP4XX_WATCHDOG) += ixp4xx_wdt.o
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obj-$(CONFIG_KS8695_WATCHDOG) += ks8695_wdt.o
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+obj-$(CONFIG_MPCORE_WATCHDOG) += mpcore_wdt.o
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obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
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obj-$(CONFIG_SA1100_WATCHDOG) += sa1100_wdt.o
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obj-$(CONFIG_SAMA5D4_WATCHDOG) += sama5d4_wdt.o
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--- /dev/null
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+++ b/drivers/watchdog/mpcore_wdt.c
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@@ -0,0 +1,118 @@
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+/*
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+ * Watchdog driver for ARM MPcore
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+ *
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+ * Copyright (C) 2017 Felix Fietkau <nbd@nbd.name>
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+ */
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+
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+#include <linux/export.h>
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+#include <linux/module.h>
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+#include <linux/kernel.h>
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+#include <linux/watchdog.h>
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+#include <linux/platform_device.h>
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+#include <linux/io.h>
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+#include <asm/smp_twd.h>
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+
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+static void __iomem *wdt_base;
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+static int wdt_timeout = 60;
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+
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+static int mpcore_wdt_keepalive(struct watchdog_device *wdd)
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+{
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+ static int perturb;
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+ u32 count;
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+
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+ count = (twd_timer_get_rate() / 256) * wdt_timeout;
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+
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+ /* Reload register needs a different value on each refresh */
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+ count += perturb;
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+ perturb = !perturb;
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+
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+ iowrite32(count, wdt_base + TWD_WDOG_LOAD);
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+
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+ return 0;
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+}
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+
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+static int mpcore_wdt_start(struct watchdog_device *wdd)
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+{
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+ mpcore_wdt_keepalive(wdd);
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+
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+ /* prescale = 256, mode = 1, enable = 1 */
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+ iowrite32(0x0000FF09, wdt_base + TWD_WDOG_CONTROL);
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+
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+ return 0;
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+}
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+
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+static int mpcore_wdt_stop(struct watchdog_device *wdd)
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+{
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+ iowrite32(0x12345678, wdt_base + TWD_WDOG_DISABLE);
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+ iowrite32(0x87654321, wdt_base + TWD_WDOG_DISABLE);
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+ iowrite32(0x0, wdt_base + TWD_WDOG_CONTROL);
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+
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+ return 0;
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+}
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+
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+static int mpcore_wdt_set_timeout(struct watchdog_device *wdd,
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+ unsigned int timeout)
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+{
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+ mpcore_wdt_stop(wdd);
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+ wdt_timeout = timeout;
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+ mpcore_wdt_start(wdd);
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+
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+ return 0;
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+}
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+
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+static const struct watchdog_info mpcore_wdt_info = {
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+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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+ .identity = "MPcore Watchdog",
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+};
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+
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+static const struct watchdog_ops mpcore_wdt_ops = {
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+ .owner = THIS_MODULE,
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+ .start = mpcore_wdt_start,
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+ .stop = mpcore_wdt_stop,
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+ .ping = mpcore_wdt_keepalive,
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+ .set_timeout = mpcore_wdt_set_timeout,
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+};
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+
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+static struct watchdog_device mpcore_wdt = {
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+ .info = &mpcore_wdt_info,
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+ .ops = &mpcore_wdt_ops,
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+ .min_timeout = 1,
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+ .max_timeout = 65535,
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+};
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+
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+static int mpcore_wdt_probe(struct platform_device *pdev)
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+{
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+ struct resource *res;
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+ unsigned long rate = twd_timer_get_rate();
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+
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+ pr_info("MPCore WD init. clockrate: %u prescaler: %u countrate: %u timeout: %us\n", rate, 256, rate / 256, wdt_timeout);
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (!res)
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+ return -ENODEV;
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+
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+ wdt_base = devm_ioremap_resource(&pdev->dev, res);
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+ if (IS_ERR(wdt_base))
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+ return PTR_ERR(wdt_base);
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+
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+ watchdog_register_device(&mpcore_wdt);
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+ return 0;
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+}
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+
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+static int mpcore_wdt_remove(struct platform_device *dev)
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+{
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+ watchdog_unregister_device(&mpcore_wdt);
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+ return 0;
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+}
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+
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+static struct platform_driver mpcore_wdt_driver = {
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+ .probe = mpcore_wdt_probe,
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+ .remove = mpcore_wdt_remove,
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+ .driver = {
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+ .name = "mpcore_wdt",
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+ },
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+};
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+
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+module_platform_driver(mpcore_wdt_driver);
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+MODULE_AUTHOR("Felix Fietkau <nbd@nbd.name>");
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+MODULE_LICENSE("GPL");
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--- a/arch/arm/include/asm/smp_twd.h
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+++ b/arch/arm/include/asm/smp_twd.h
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@@ -34,5 +34,6 @@ struct twd_local_timer name __initdata =
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};
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int twd_local_timer_register(struct twd_local_timer *);
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+unsigned long twd_timer_get_rate(void);
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#endif
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--- a/arch/arm/kernel/smp_twd.c
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+++ b/arch/arm/kernel/smp_twd.c
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@@ -15,6 +15,7 @@
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/err.h>
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+#include <linux/export.h>
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#include <linux/smp.h>
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#include <linux/jiffies.h>
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#include <linux/clockchips.h>
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@@ -380,6 +381,14 @@ int __init twd_local_timer_register(stru
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return twd_local_timer_common_register(NULL);
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}
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+/* Needed by mpcore_wdt */
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+unsigned long twd_timer_get_rate(void)
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+{
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+ return twd_timer_rate;
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+}
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+EXPORT_SYMBOL_GPL(twd_timer_get_rate);
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+
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+
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#ifdef CONFIG_OF
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static int __init twd_local_timer_of_register(struct device_node *np)
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{
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