Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 257 insertions, 0 deletions

diff --git a/drivers/watchdog/imx_sc_wdt.c b/drivers/watchdog/imx_sc_wdt.c
new file mode 100644
index 000000000..8ac021748
--- /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/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/of.h>
+#include <linux/platform_device.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);
+
+	ret = imx_sc_wdt_set_timeout(wdog, wdog->timeout);
+	if (ret)
+		return ret;
+
+	watchdog_stop_on_reboot(wdog);
+	watchdog_stop_on_unregister(wdog);
+
+	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");
+		goto register_device;
+	}
+
+	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");
+		goto register_device;
+	}
+
+	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");
+
+register_device:
+	return devm_watchdog_register_device(dev, wdog);
+}
+
+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");