@@ -152,6 +152,17 @@ config ARM_SP805_WATCHDOG
ARM Primecell SP805 Watchdog timer. This will reboot your system when
the timeout is reached.
+config ARM_SBSA_WATCHDOG
+ tristate "ARM SBSA Generic Watchdog"
+ depends on ARM64
+ depends on ARM_ARCH_TIMER
+ select WATCHDOG_CORE
+ help
+ ARM SBSA Generic Watchdog. This watchdog has two Watchdog timeouts.
+ The first timeout will trigger a panic; the second timeout will
+ trigger a system reset.
+ More details: ARM DEN0029B - Server Base System Architecture (SBSA)
+
config AT91RM9200_WATCHDOG
tristate "AT91RM9200 watchdog"
depends on SOC_AT91RM9200 && MFD_SYSCON
@@ -30,6 +30,7 @@ obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o
# ARM Architecture
obj-$(CONFIG_ARM_SP805_WATCHDOG) += sp805_wdt.o
+obj-$(CONFIG_ARM_SBSA_WATCHDOG) += sbsa_gwdt.o
obj-$(CONFIG_AT91RM9200_WATCHDOG) += at91rm9200_wdt.o
obj-$(CONFIG_AT91SAM9X_WATCHDOG) += at91sam9_wdt.o
obj-$(CONFIG_CADENCE_WATCHDOG) += cadence_wdt.o
new file mode 100644
@@ -0,0 +1,409 @@
+/*
+ * SBSA(Server Base System Architecture) Generic Watchdog driver
+ *
+ * Copyright (c) 2015, Linaro Ltd.
+ * Author: Fu Wei <fu.wei@linaro.org>
+ * Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License 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.
+ *
+ * Note: This SBSA Generic watchdog driver is compatible with
+ * the pretimeout concept of Linux kernel.
+ * The timeout and pretimeout are set by the different REGs.
+ * The first watch period is set by writing WCV directly,
+ * that can support more than 10s timeout at the maximum
+ * system counter frequency.
+ * The second watch period is set by WOR(32bit) which will be loaded
+ * automatically by hardware, when WS0 is triggered.
+ * This gives a maximum watch period of around 10s at the maximum
+ * system counter frequency.
+ * The System Counter shall run at maximum of 400MHz.
+ * More details: ARM DEN0029B - Server Base System Architecture (SBSA)
+ *
+ * Kernel/API: P---------| pretimeout
+ * |-------------------------------T timeout
+ * SBSA GWDT: P--WOR---WS1 pretimeout
+ * |-------WCV----------WS0~~~~~~~~T timeout
+ */
+
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+#include <linux/watchdog.h>
+#include <asm/arch_timer.h>
+
+/* SBSA Generic Watchdog register definitions */
+/* refresh frame */
+#define SBSA_GWDT_WRR 0x000
+
+/* control frame */
+#define SBSA_GWDT_WCS 0x000
+#define SBSA_GWDT_WOR 0x008
+#define SBSA_GWDT_WCV_LO 0x010
+#define SBSA_GWDT_WCV_HI 0x014
+
+/* refresh/control frame */
+#define SBSA_GWDT_W_IIDR 0xfcc
+#define SBSA_GWDT_IDR 0xfd0
+
+/* Watchdog Control and Status Register */
+#define SBSA_GWDT_WCS_EN BIT(0)
+#define SBSA_GWDT_WCS_WS0 BIT(1)
+#define SBSA_GWDT_WCS_WS1 BIT(2)
+
+/**
+ * struct sbsa_gwdt - Internal representation of the SBSA GWDT
+ * @wdd: kernel watchdog_device structure
+ * @clk: store the System Counter clock frequency, in Hz.
+ * @refresh_base: Virtual address of the watchdog refresh frame
+ * @control_base: Virtual address of the watchdog control frame
+ */
+struct sbsa_gwdt {
+ struct watchdog_device wdd;
+ u32 clk;
+ void __iomem *refresh_base;
+ void __iomem *control_base;
+};
+
+#define to_sbsa_gwdt(e) container_of(e, struct sbsa_gwdt, wdd)
+
+#define DEFAULT_TIMEOUT 30 /* seconds, the 1st + 2nd watch periods*/
+#define DEFAULT_PRETIMEOUT 10 /* seconds, the 2nd watch period*/
+
+static unsigned int timeout;
+module_param(timeout, uint, 0);
+MODULE_PARM_DESC(timeout,
+ "Watchdog timeout in seconds. (>=0, default="
+ __MODULE_STRING(DEFAULT_TIMEOUT) ")");
+
+static unsigned int pretimeout;
+module_param(pretimeout, uint, 0);
+MODULE_PARM_DESC(pretimeout,
+ "Watchdog pretimeout in seconds. (>=0, default="
+ __MODULE_STRING(DEFAULT_PRETIMEOUT) ")");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, S_IRUGO);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+/*
+ * help functions for accessing 64bit WCV register
+ */
+static u64 sbsa_gwdt_get_wcv(struct watchdog_device *wdd)
+{
+ u32 wcv_lo, wcv_hi;
+ struct sbsa_gwdt *gwdt = to_sbsa_gwdt(wdd);
+
+ do {
+ wcv_hi = readl_relaxed(gwdt->control_base + SBSA_GWDT_WCV_HI);
+ wcv_lo = readl_relaxed(gwdt->control_base + SBSA_GWDT_WCV_LO);
+ } while (wcv_hi != readl_relaxed(gwdt->control_base +
+ SBSA_GWDT_WCV_HI));
+
+ return (((u64)wcv_hi << 32) | wcv_lo);
+}
+
+static void sbsa_gwdt_set_wcv(struct watchdog_device *wdd, u64 value)
+{
+ struct sbsa_gwdt *gwdt = to_sbsa_gwdt(wdd);
+
+ writel_relaxed(upper_32_bits(value),
+ gwdt->control_base + SBSA_GWDT_WCV_HI);
+ writel_relaxed(lower_32_bits(value),
+ gwdt->control_base + SBSA_GWDT_WCV_LO);
+}
+
+static void reload_timeout_to_wcv(struct watchdog_device *wdd)
+{
+ struct sbsa_gwdt *gwdt = to_sbsa_gwdt(wdd);
+ u64 wcv;
+
+ wcv = arch_counter_get_cntvct() +
+ (u64)(wdd->timeout - wdd->pretimeout) * gwdt->clk;
+
+ sbsa_gwdt_set_wcv(wdd, wcv);
+}
+
+static int sbsa_gwdt_set_timeout(struct watchdog_device *wdd,
+ unsigned int timeout)
+{
+ wdd->timeout = timeout;
+
+ return 0;
+}
+
+static int sbsa_gwdt_set_pretimeout(struct watchdog_device *wdd,
+ unsigned int pretimeout)
+{
+ struct sbsa_gwdt *gwdt = to_sbsa_gwdt(wdd);
+ u32 wor;
+
+ wdd->pretimeout = pretimeout;
+
+ if (!pretimeout)
+ /*
+ * If pretimeout is 0, it gives driver a timeslot(1s)
+ * to update WCV after an explicit refresh(sbsa_gwdt_start)
+ */
+ wor = gwdt->clk;
+ else
+ wor = pretimeout * gwdt->clk;
+
+ /* refresh the WOR, that will cause an explicit watchdog refresh */
+ writel_relaxed(wor, gwdt->control_base + SBSA_GWDT_WOR);
+
+ return 0;
+}
+
+static unsigned int sbsa_gwdt_get_timeleft(struct watchdog_device *wdd)
+{
+ struct sbsa_gwdt *gwdt = to_sbsa_gwdt(wdd);
+ u64 timeleft = sbsa_gwdt_get_wcv(wdd) - arch_counter_get_cntvct();
+
+ do_div(timeleft, gwdt->clk);
+
+ return timeleft;
+}
+
+static int sbsa_gwdt_keepalive(struct watchdog_device *wdd)
+{
+ reload_timeout_to_wcv(wdd);
+
+ return 0;
+}
+
+static int sbsa_gwdt_start(struct watchdog_device *wdd)
+{
+ struct sbsa_gwdt *gwdt = to_sbsa_gwdt(wdd);
+ /*
+ * Writing WRR for an explicit watchdog refresh.
+ * You can write anyting(like 0xc0ffee).
+ * Force refresh due to hardware bug found in certain Soc.
+ */
+ writel_relaxed(0xc0ffee, gwdt->refresh_base + SBSA_GWDT_WRR);
+ /* writing WCS will cause an explicit watchdog refresh */
+ writel_relaxed(SBSA_GWDT_WCS_EN, gwdt->control_base + SBSA_GWDT_WCS);
+
+ return sbsa_gwdt_keepalive(wdd);
+}
+
+static int sbsa_gwdt_stop(struct watchdog_device *wdd)
+{
+ struct sbsa_gwdt *gwdt = to_sbsa_gwdt(wdd);
+
+ writel_relaxed(0, gwdt->control_base + SBSA_GWDT_WCS);
+
+ return 0;
+}
+
+static irqreturn_t sbsa_gwdt_interrupt(int irq, void *dev_id)
+{
+ struct sbsa_gwdt *gwdt = (struct sbsa_gwdt *)dev_id;
+ struct watchdog_device *wdd = &gwdt->wdd;
+
+ if (wdd->pretimeout)
+ /* The pretimeout is valid, go panic */
+ panic("SBSA Watchdog pre-timeout");
+ else
+ /* We don't use pretimeout, trigger WS1 now*/
+ sbsa_gwdt_set_wcv(wdd, 0);
+
+ return IRQ_HANDLED;
+}
+
+static struct watchdog_info sbsa_gwdt_info = {
+ .identity = "SBSA Generic Watchdog",
+ .options = WDIOF_SETTIMEOUT |
+ WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE |
+ WDIOF_PRETIMEOUT |
+ WDIOF_CARDRESET,
+};
+
+static struct watchdog_ops sbsa_gwdt_ops = {
+ .owner = THIS_MODULE,
+ .start = sbsa_gwdt_start,
+ .stop = sbsa_gwdt_stop,
+ .ping = sbsa_gwdt_keepalive,
+ .set_timeout = sbsa_gwdt_set_timeout,
+ .set_pretimeout = sbsa_gwdt_set_pretimeout,
+ .get_timeleft = sbsa_gwdt_get_timeleft,
+};
+
+static int sbsa_gwdt_probe(struct platform_device *pdev)
+{
+ u64 first_period_max = U64_MAX;
+ struct device *dev = &pdev->dev;
+ struct watchdog_device *wdd;
+ struct sbsa_gwdt *gwdt;
+ struct resource *res;
+ void *rf_base, *cf_base;
+ int ret, irq;
+ u32 status;
+
+ gwdt = devm_kzalloc(dev, sizeof(*gwdt), GFP_KERNEL);
+ if (!gwdt)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, gwdt);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "refresh");
+ rf_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(rf_base))
+ return PTR_ERR(rf_base);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "control");
+ cf_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(cf_base))
+ return PTR_ERR(cf_base);
+
+ irq = platform_get_irq_byname(pdev, "ws0");
+ if (irq < 0) {
+ dev_err(dev, "unable to get ws0 interrupt.\n");
+ return irq;
+ }
+
+ /*
+ * Get the frequency of system counter from the cp15 interface of ARM
+ * Generic timer. We don't need to check it, because if it returns "0",
+ * system would panic in very early stage.
+ */
+ gwdt->clk = arch_timer_get_cntfrq();
+ gwdt->refresh_base = rf_base;
+ gwdt->control_base = cf_base;
+
+ wdd = &gwdt->wdd;
+ wdd->parent = dev;
+ wdd->info = &sbsa_gwdt_info;
+ wdd->ops = &sbsa_gwdt_ops;
+ watchdog_set_drvdata(wdd, gwdt);
+ watchdog_set_nowayout(wdd, nowayout);
+
+ wdd->min_pretimeout = 0;
+ wdd->max_pretimeout = U32_MAX / gwdt->clk;
+ wdd->min_timeout = 1;
+ do_div(first_period_max, gwdt->clk);
+ wdd->max_timeout = first_period_max;
+
+ wdd->pretimeout = DEFAULT_PRETIMEOUT;
+ wdd->timeout = DEFAULT_TIMEOUT;
+ watchdog_init_timeouts(wdd, pretimeout, timeout, dev);
+
+ status = readl_relaxed(gwdt->control_base + SBSA_GWDT_WCS);
+ if (status & SBSA_GWDT_WCS_WS1) {
+ dev_warn(dev, "System reset by WDT(WCV: %llx)\n",
+ sbsa_gwdt_get_wcv(wdd));
+ wdd->bootstatus |= WDIOF_CARDRESET;
+ }
+ /* Check if watchdog is already enabled */
+ if (status & SBSA_GWDT_WCS_EN) {
+ dev_warn(dev, "already enabled\n");
+ sbsa_gwdt_keepalive(wdd);
+ }
+
+ /* update pretimeout to WOR */
+ sbsa_gwdt_set_pretimeout(wdd, wdd->pretimeout);
+
+ ret = devm_request_irq(dev, irq, sbsa_gwdt_interrupt, 0,
+ pdev->name, gwdt);
+ if (ret) {
+ dev_err(dev, "unable to request IRQ %d\n", irq);
+ return ret;
+ }
+
+ ret = watchdog_register_device(wdd);
+ if (ret)
+ return ret;
+
+ dev_info(dev, "Initialized with %ds timeout, %ds pretimeout @ %u Hz\n",
+ wdd->timeout, wdd->pretimeout, gwdt->clk);
+
+ return 0;
+}
+
+static void sbsa_gwdt_shutdown(struct platform_device *pdev)
+{
+ struct sbsa_gwdt *gwdt = platform_get_drvdata(pdev);
+
+ sbsa_gwdt_stop(&gwdt->wdd);
+}
+
+static int sbsa_gwdt_remove(struct platform_device *pdev)
+{
+ struct sbsa_gwdt *gwdt = platform_get_drvdata(pdev);
+
+ watchdog_unregister_device(&gwdt->wdd);
+
+ return 0;
+}
+
+/* Disable watchdog if it is active during suspend */
+static int __maybe_unused sbsa_gwdt_suspend(struct device *dev)
+{
+ struct sbsa_gwdt *gwdt = dev_get_drvdata(dev);
+
+ if (watchdog_active(&gwdt->wdd))
+ sbsa_gwdt_stop(&gwdt->wdd);
+
+ return 0;
+}
+
+/* Enable watchdog and configure it if necessary */
+static int __maybe_unused sbsa_gwdt_resume(struct device *dev)
+{
+ struct sbsa_gwdt *gwdt = dev_get_drvdata(dev);
+
+ if (watchdog_active(&gwdt->wdd))
+ sbsa_gwdt_start(&gwdt->wdd);
+
+ return 0;
+}
+
+static const struct dev_pm_ops sbsa_gwdt_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(sbsa_gwdt_suspend, sbsa_gwdt_resume)
+};
+
+static const struct of_device_id sbsa_gwdt_of_match[] = {
+ { .compatible = "arm,sbsa-gwdt", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sbsa_gwdt_of_match);
+
+static const struct platform_device_id sbsa_gwdt_pdev_match[] = {
+ { .name = "sbsa-gwdt", },
+ {},
+};
+MODULE_DEVICE_TABLE(platform, sbsa_gwdt_pdev_match);
+
+static struct platform_driver sbsa_gwdt_driver = {
+ .driver = {
+ .name = "sbsa-gwdt",
+ .pm = &sbsa_gwdt_pm_ops,
+ .of_match_table = sbsa_gwdt_of_match,
+ },
+ .probe = sbsa_gwdt_probe,
+ .remove = sbsa_gwdt_remove,
+ .shutdown = sbsa_gwdt_shutdown,
+ .id_table = sbsa_gwdt_pdev_match,
+};
+
+module_platform_driver(sbsa_gwdt_driver);
+
+MODULE_DESCRIPTION("SBSA Generic Watchdog Driver");
+MODULE_VERSION("v1.0");
+MODULE_AUTHOR("Fu Wei <fu.wei@linaro.org>");
+MODULE_AUTHOR("Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>");
+MODULE_LICENSE("GPL v2");