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-rw-r--r--drivers/watchdog/tegra_wdt.c274
1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/watchdog/tegra_wdt.c b/drivers/watchdog/tegra_wdt.c
new file mode 100644
index 000000000..d5de6c065
--- /dev/null
+++ b/drivers/watchdog/tegra_wdt.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+
+/* minimum and maximum watchdog trigger timeout, in seconds */
+#define MIN_WDT_TIMEOUT 1
+#define MAX_WDT_TIMEOUT 255
+
+/*
+ * Base of the WDT registers, from the timer base address. There are
+ * actually 5 watchdogs that can be configured (by pairing with an available
+ * timer), at bases 0x100 + (WDT ID) * 0x20, where WDT ID is 0 through 4.
+ * This driver only configures the first watchdog (WDT ID 0).
+ */
+#define WDT_BASE 0x100
+#define WDT_ID 0
+
+/*
+ * Register base of the timer that's selected for pairing with the watchdog.
+ * This driver arbitrarily uses timer 5, which is currently unused by
+ * other drivers (in particular, the Tegra clocksource driver). If this
+ * needs to change, take care that the new timer is not used by the
+ * clocksource driver.
+ */
+#define WDT_TIMER_BASE 0x60
+#define WDT_TIMER_ID 5
+
+/* WDT registers */
+#define WDT_CFG 0x0
+#define WDT_CFG_PERIOD_SHIFT 4
+#define WDT_CFG_PERIOD_MASK 0xff
+#define WDT_CFG_INT_EN (1 << 12)
+#define WDT_CFG_PMC2CAR_RST_EN (1 << 15)
+#define WDT_STS 0x4
+#define WDT_STS_COUNT_SHIFT 4
+#define WDT_STS_COUNT_MASK 0xff
+#define WDT_STS_EXP_SHIFT 12
+#define WDT_STS_EXP_MASK 0x3
+#define WDT_CMD 0x8
+#define WDT_CMD_START_COUNTER (1 << 0)
+#define WDT_CMD_DISABLE_COUNTER (1 << 1)
+#define WDT_UNLOCK (0xc)
+#define WDT_UNLOCK_PATTERN (0xc45a << 0)
+
+/* Timer registers */
+#define TIMER_PTV 0x0
+#define TIMER_EN (1 << 31)
+#define TIMER_PERIODIC (1 << 30)
+
+struct tegra_wdt {
+ struct watchdog_device wdd;
+ void __iomem *wdt_regs;
+ void __iomem *tmr_regs;
+};
+
+#define WDT_HEARTBEAT 120
+static int heartbeat = WDT_HEARTBEAT;
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat,
+ "Watchdog heartbeats in seconds. (default = "
+ __MODULE_STRING(WDT_HEARTBEAT) ")");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static int tegra_wdt_start(struct watchdog_device *wdd)
+{
+ struct tegra_wdt *wdt = watchdog_get_drvdata(wdd);
+ u32 val;
+
+ /*
+ * This thing has a fixed 1MHz clock. Normally, we would set the
+ * period to 1 second by writing 1000000ul, but the watchdog system
+ * reset actually occurs on the 4th expiration of this counter,
+ * so we set the period to 1/4 of this amount.
+ */
+ val = 1000000ul / 4;
+ val |= (TIMER_EN | TIMER_PERIODIC);
+ writel(val, wdt->tmr_regs + TIMER_PTV);
+
+ /*
+ * Set number of periods and start counter.
+ *
+ * Interrupt handler is not required for user space
+ * WDT accesses, since the caller is responsible to ping the
+ * WDT to reset the counter before expiration, through ioctls.
+ */
+ val = WDT_TIMER_ID |
+ (wdd->timeout << WDT_CFG_PERIOD_SHIFT) |
+ WDT_CFG_PMC2CAR_RST_EN;
+ writel(val, wdt->wdt_regs + WDT_CFG);
+
+ writel(WDT_CMD_START_COUNTER, wdt->wdt_regs + WDT_CMD);
+
+ return 0;
+}
+
+static int tegra_wdt_stop(struct watchdog_device *wdd)
+{
+ struct tegra_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ writel(WDT_UNLOCK_PATTERN, wdt->wdt_regs + WDT_UNLOCK);
+ writel(WDT_CMD_DISABLE_COUNTER, wdt->wdt_regs + WDT_CMD);
+ writel(0, wdt->tmr_regs + TIMER_PTV);
+
+ return 0;
+}
+
+static int tegra_wdt_ping(struct watchdog_device *wdd)
+{
+ struct tegra_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ writel(WDT_CMD_START_COUNTER, wdt->wdt_regs + WDT_CMD);
+
+ return 0;
+}
+
+static int tegra_wdt_set_timeout(struct watchdog_device *wdd,
+ unsigned int timeout)
+{
+ wdd->timeout = timeout;
+
+ if (watchdog_active(wdd)) {
+ tegra_wdt_stop(wdd);
+ return tegra_wdt_start(wdd);
+ }
+
+ return 0;
+}
+
+static unsigned int tegra_wdt_get_timeleft(struct watchdog_device *wdd)
+{
+ struct tegra_wdt *wdt = watchdog_get_drvdata(wdd);
+ u32 val;
+ int count;
+ int exp;
+
+ val = readl(wdt->wdt_regs + WDT_STS);
+
+ /* Current countdown (from timeout) */
+ count = (val >> WDT_STS_COUNT_SHIFT) & WDT_STS_COUNT_MASK;
+
+ /* Number of expirations (we are waiting for the 4th expiration) */
+ exp = (val >> WDT_STS_EXP_SHIFT) & WDT_STS_EXP_MASK;
+
+ /*
+ * The entire thing is divided by 4 because we are ticking down 4 times
+ * faster due to needing to wait for the 4th expiration.
+ */
+ return (((3 - exp) * wdd->timeout) + count) / 4;
+}
+
+static const struct watchdog_info tegra_wdt_info = {
+ .options = WDIOF_SETTIMEOUT |
+ WDIOF_MAGICCLOSE |
+ WDIOF_KEEPALIVEPING,
+ .firmware_version = 0,
+ .identity = "Tegra Watchdog",
+};
+
+static const struct watchdog_ops tegra_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = tegra_wdt_start,
+ .stop = tegra_wdt_stop,
+ .ping = tegra_wdt_ping,
+ .set_timeout = tegra_wdt_set_timeout,
+ .get_timeleft = tegra_wdt_get_timeleft,
+};
+
+static int tegra_wdt_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct watchdog_device *wdd;
+ struct tegra_wdt *wdt;
+ void __iomem *regs;
+ int ret;
+
+ /* This is the timer base. */
+ regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(regs))
+ return PTR_ERR(regs);
+
+ /*
+ * Allocate our watchdog driver data, which has the
+ * struct watchdog_device nested within it.
+ */
+ wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
+ if (!wdt)
+ return -ENOMEM;
+
+ /* Initialize struct tegra_wdt. */
+ wdt->wdt_regs = regs + WDT_BASE;
+ wdt->tmr_regs = regs + WDT_TIMER_BASE;
+
+ /* Initialize struct watchdog_device. */
+ wdd = &wdt->wdd;
+ wdd->timeout = heartbeat;
+ wdd->info = &tegra_wdt_info;
+ wdd->ops = &tegra_wdt_ops;
+ wdd->min_timeout = MIN_WDT_TIMEOUT;
+ wdd->max_timeout = MAX_WDT_TIMEOUT;
+ wdd->parent = dev;
+
+ watchdog_set_drvdata(wdd, wdt);
+
+ watchdog_set_nowayout(wdd, nowayout);
+
+ watchdog_stop_on_unregister(wdd);
+ ret = devm_watchdog_register_device(dev, wdd);
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, wdt);
+
+ dev_info(dev, "initialized (heartbeat = %d sec, nowayout = %d)\n",
+ heartbeat, nowayout);
+
+ return 0;
+}
+
+static int tegra_wdt_suspend(struct device *dev)
+{
+ struct tegra_wdt *wdt = dev_get_drvdata(dev);
+
+ if (watchdog_active(&wdt->wdd))
+ tegra_wdt_stop(&wdt->wdd);
+
+ return 0;
+}
+
+static int tegra_wdt_resume(struct device *dev)
+{
+ struct tegra_wdt *wdt = dev_get_drvdata(dev);
+
+ if (watchdog_active(&wdt->wdd))
+ tegra_wdt_start(&wdt->wdd);
+
+ return 0;
+}
+
+static const struct of_device_id tegra_wdt_of_match[] = {
+ { .compatible = "nvidia,tegra30-timer", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tegra_wdt_of_match);
+
+static DEFINE_SIMPLE_DEV_PM_OPS(tegra_wdt_pm_ops,
+ tegra_wdt_suspend, tegra_wdt_resume);
+
+static struct platform_driver tegra_wdt_driver = {
+ .probe = tegra_wdt_probe,
+ .driver = {
+ .name = "tegra-wdt",
+ .pm = pm_sleep_ptr(&tegra_wdt_pm_ops),
+ .of_match_table = tegra_wdt_of_match,
+ },
+};
+module_platform_driver(tegra_wdt_driver);
+
+MODULE_AUTHOR("NVIDIA Corporation");
+MODULE_DESCRIPTION("Tegra Watchdog Driver");
+MODULE_LICENSE("GPL v2");