Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/watchdog/imx_sc_wdt.c b/drivers/watchdog/imx_sc_wdt.c
new file mode 100644
index 0000000..8ed89f0
--- /dev/null
+++ b/drivers/watchdog/imx_sc_wdt.c
@@ -0,0 +1,257 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2018-2019 NXP.
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/firmware/imx/sci.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/watchdog.h>
+
+#define DEFAULT_TIMEOUT 60
+/*
+ * Software timer tick implemented in scfw side, support 10ms to 0xffffffff ms
+ * in theory, but for normal case, 1s~128s is enough, you can change this max
+ * value in case it's not enough.
+ */
+#define MAX_TIMEOUT 128
+
+#define IMX_SIP_TIMER 0xC2000002
+#define IMX_SIP_TIMER_START_WDOG 0x01
+#define IMX_SIP_TIMER_STOP_WDOG 0x02
+#define IMX_SIP_TIMER_SET_WDOG_ACT 0x03
+#define IMX_SIP_TIMER_PING_WDOG 0x04
+#define IMX_SIP_TIMER_SET_TIMEOUT_WDOG 0x05
+#define IMX_SIP_TIMER_GET_WDOG_STAT 0x06
+#define IMX_SIP_TIMER_SET_PRETIME_WDOG 0x07
+
+#define SC_TIMER_WDOG_ACTION_PARTITION 0
+
+#define SC_IRQ_WDOG 1
+#define SC_IRQ_GROUP_WDOG 1
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0000);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+struct imx_sc_wdt_device {
+ struct watchdog_device wdd;
+ struct notifier_block wdt_notifier;
+};
+
+static int imx_sc_wdt_ping(struct watchdog_device *wdog)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_PING_WDOG,
+ 0, 0, 0, 0, 0, 0, &res);
+
+ return 0;
+}
+
+static int imx_sc_wdt_start(struct watchdog_device *wdog)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_START_WDOG,
+ 0, 0, 0, 0, 0, 0, &res);
+ if (res.a0)
+ return -EACCES;
+
+ arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_WDOG_ACT,
+ SC_TIMER_WDOG_ACTION_PARTITION,
+ 0, 0, 0, 0, 0, &res);
+ return res.a0 ? -EACCES : 0;
+}
+
+static int imx_sc_wdt_stop(struct watchdog_device *wdog)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_STOP_WDOG,
+ 0, 0, 0, 0, 0, 0, &res);
+
+ return res.a0 ? -EACCES : 0;
+}
+
+static int imx_sc_wdt_set_timeout(struct watchdog_device *wdog,
+ unsigned int timeout)
+{
+ struct arm_smccc_res res;
+
+ wdog->timeout = timeout;
+ arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_TIMEOUT_WDOG,
+ timeout * 1000, 0, 0, 0, 0, 0, &res);
+
+ return res.a0 ? -EACCES : 0;
+}
+
+static int imx_sc_wdt_set_pretimeout(struct watchdog_device *wdog,
+ unsigned int pretimeout)
+{
+ struct arm_smccc_res res;
+
+ /*
+ * SCU firmware calculates pretimeout based on current time
+ * stamp instead of watchdog timeout stamp, need to convert
+ * the pretimeout to SCU firmware's timeout value.
+ */
+ arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_PRETIME_WDOG,
+ (wdog->timeout - pretimeout) * 1000, 0, 0, 0,
+ 0, 0, &res);
+ if (res.a0)
+ return -EACCES;
+
+ wdog->pretimeout = pretimeout;
+
+ return 0;
+}
+
+static int imx_sc_wdt_notify(struct notifier_block *nb,
+ unsigned long event, void *group)
+{
+ struct imx_sc_wdt_device *imx_sc_wdd =
+ container_of(nb,
+ struct imx_sc_wdt_device,
+ wdt_notifier);
+
+ if (event & SC_IRQ_WDOG &&
+ *(u8 *)group == SC_IRQ_GROUP_WDOG)
+ watchdog_notify_pretimeout(&imx_sc_wdd->wdd);
+
+ return 0;
+}
+
+static void imx_sc_wdt_action(void *data)
+{
+ struct notifier_block *wdt_notifier = data;
+
+ imx_scu_irq_unregister_notifier(wdt_notifier);
+ imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
+ SC_IRQ_WDOG,
+ false);
+}
+
+static const struct watchdog_ops imx_sc_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = imx_sc_wdt_start,
+ .stop = imx_sc_wdt_stop,
+ .ping = imx_sc_wdt_ping,
+ .set_timeout = imx_sc_wdt_set_timeout,
+ .set_pretimeout = imx_sc_wdt_set_pretimeout,
+};
+
+static struct watchdog_info imx_sc_wdt_info = {
+ .identity = "i.MX SC watchdog timer",
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE,
+};
+
+static int imx_sc_wdt_probe(struct platform_device *pdev)
+{
+ struct imx_sc_wdt_device *imx_sc_wdd;
+ struct watchdog_device *wdog;
+ struct device *dev = &pdev->dev;
+ int ret;
+
+ imx_sc_wdd = devm_kzalloc(dev, sizeof(*imx_sc_wdd), GFP_KERNEL);
+ if (!imx_sc_wdd)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, imx_sc_wdd);
+
+ wdog = &imx_sc_wdd->wdd;
+ wdog->info = &imx_sc_wdt_info;
+ wdog->ops = &imx_sc_wdt_ops;
+ wdog->min_timeout = 1;
+ wdog->max_timeout = MAX_TIMEOUT;
+ wdog->parent = dev;
+ wdog->timeout = DEFAULT_TIMEOUT;
+
+ watchdog_init_timeout(wdog, 0, dev);
+ watchdog_stop_on_reboot(wdog);
+ watchdog_stop_on_unregister(wdog);
+
+ ret = devm_watchdog_register_device(dev, wdog);
+ if (ret)
+ return ret;
+
+ ret = imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
+ SC_IRQ_WDOG,
+ true);
+ if (ret) {
+ dev_warn(dev, "Enable irq failed, pretimeout NOT supported\n");
+ return 0;
+ }
+
+ imx_sc_wdd->wdt_notifier.notifier_call = imx_sc_wdt_notify;
+ ret = imx_scu_irq_register_notifier(&imx_sc_wdd->wdt_notifier);
+ if (ret) {
+ imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
+ SC_IRQ_WDOG,
+ false);
+ dev_warn(dev,
+ "Register irq notifier failed, pretimeout NOT supported\n");
+ return 0;
+ }
+
+ ret = devm_add_action_or_reset(dev, imx_sc_wdt_action,
+ &imx_sc_wdd->wdt_notifier);
+ if (!ret)
+ imx_sc_wdt_info.options |= WDIOF_PRETIMEOUT;
+ else
+ dev_warn(dev, "Add action failed, pretimeout NOT supported\n");
+
+ return 0;
+}
+
+static int __maybe_unused imx_sc_wdt_suspend(struct device *dev)
+{
+ struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
+
+ if (watchdog_active(&imx_sc_wdd->wdd))
+ imx_sc_wdt_stop(&imx_sc_wdd->wdd);
+
+ return 0;
+}
+
+static int __maybe_unused imx_sc_wdt_resume(struct device *dev)
+{
+ struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
+
+ if (watchdog_active(&imx_sc_wdd->wdd))
+ imx_sc_wdt_start(&imx_sc_wdd->wdd);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(imx_sc_wdt_pm_ops,
+ imx_sc_wdt_suspend, imx_sc_wdt_resume);
+
+static const struct of_device_id imx_sc_wdt_dt_ids[] = {
+ { .compatible = "fsl,imx-sc-wdt", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_sc_wdt_dt_ids);
+
+static struct platform_driver imx_sc_wdt_driver = {
+ .probe = imx_sc_wdt_probe,
+ .driver = {
+ .name = "imx-sc-wdt",
+ .of_match_table = imx_sc_wdt_dt_ids,
+ .pm = &imx_sc_wdt_pm_ops,
+ },
+};
+module_platform_driver(imx_sc_wdt_driver);
+
+MODULE_AUTHOR("Robin Gong <yibin.gong@nxp.com>");
+MODULE_DESCRIPTION("NXP i.MX system controller watchdog driver");
+MODULE_LICENSE("GPL v2");