Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 462 insertions, 0 deletions

diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
new file mode 100644
index 000000000..e97787536
--- /dev/null
+++ b/drivers/watchdog/mtk_wdt.c
@@ -0,0 +1,462 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Mediatek Watchdog Driver
+ *
+ * Copyright (C) 2014 Matthias Brugger
+ *
+ * Matthias Brugger <matthias.bgg@gmail.com>
+ *
+ * Based on sunxi_wdt.c
+ */
+
+#include <dt-bindings/reset/mt2712-resets.h>
+#include <dt-bindings/reset/mt7986-resets.h>
+#include <dt-bindings/reset/mt8183-resets.h>
+#include <dt-bindings/reset/mt8186-resets.h>
+#include <dt-bindings/reset/mt8192-resets.h>
+#include <dt-bindings/reset/mt8195-resets.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.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/reset-controller.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <linux/interrupt.h>
+
+#define WDT_MAX_TIMEOUT		31
+#define WDT_MIN_TIMEOUT		2
+#define WDT_LENGTH_TIMEOUT(n)	((n) << 5)
+
+#define WDT_LENGTH		0x04
+#define WDT_LENGTH_KEY		0x8
+
+#define WDT_RST			0x08
+#define WDT_RST_RELOAD		0x1971
+
+#define WDT_MODE		0x00
+#define WDT_MODE_EN		(1 << 0)
+#define WDT_MODE_EXT_POL_LOW	(0 << 1)
+#define WDT_MODE_EXT_POL_HIGH	(1 << 1)
+#define WDT_MODE_EXRST_EN	(1 << 2)
+#define WDT_MODE_IRQ_EN		(1 << 3)
+#define WDT_MODE_AUTO_START	(1 << 4)
+#define WDT_MODE_DUAL_EN	(1 << 6)
+#define WDT_MODE_KEY		0x22000000
+
+#define WDT_SWRST		0x14
+#define WDT_SWRST_KEY		0x1209
+
+#define WDT_SWSYSRST		0x18U
+#define WDT_SWSYS_RST_KEY	0x88000000
+
+#define DRV_NAME		"mtk-wdt"
+#define DRV_VERSION		"1.0"
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+static unsigned int timeout;
+
+struct mtk_wdt_dev {
+	struct watchdog_device wdt_dev;
+	void __iomem *wdt_base;
+	spinlock_t lock; /* protects WDT_SWSYSRST reg */
+	struct reset_controller_dev rcdev;
+	bool disable_wdt_extrst;
+};
+
+struct mtk_wdt_data {
+	int toprgu_sw_rst_num;
+};
+
+static const struct mtk_wdt_data mt2712_data = {
+	.toprgu_sw_rst_num = MT2712_TOPRGU_SW_RST_NUM,
+};
+
+static const struct mtk_wdt_data mt7986_data = {
+	.toprgu_sw_rst_num = MT7986_TOPRGU_SW_RST_NUM,
+};
+
+static const struct mtk_wdt_data mt8183_data = {
+	.toprgu_sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
+};
+
+static const struct mtk_wdt_data mt8186_data = {
+	.toprgu_sw_rst_num = MT8186_TOPRGU_SW_RST_NUM,
+};
+
+static const struct mtk_wdt_data mt8192_data = {
+	.toprgu_sw_rst_num = MT8192_TOPRGU_SW_RST_NUM,
+};
+
+static const struct mtk_wdt_data mt8195_data = {
+	.toprgu_sw_rst_num = MT8195_TOPRGU_SW_RST_NUM,
+};
+
+static int toprgu_reset_update(struct reset_controller_dev *rcdev,
+			       unsigned long id, bool assert)
+{
+	unsigned int tmp;
+	unsigned long flags;
+	struct mtk_wdt_dev *data =
+		 container_of(rcdev, struct mtk_wdt_dev, rcdev);
+
+	spin_lock_irqsave(&data->lock, flags);
+
+	tmp = readl(data->wdt_base + WDT_SWSYSRST);
+	if (assert)
+		tmp |= BIT(id);
+	else
+		tmp &= ~BIT(id);
+	tmp |= WDT_SWSYS_RST_KEY;
+	writel(tmp, data->wdt_base + WDT_SWSYSRST);
+
+	spin_unlock_irqrestore(&data->lock, flags);
+
+	return 0;
+}
+
+static int toprgu_reset_assert(struct reset_controller_dev *rcdev,
+			       unsigned long id)
+{
+	return toprgu_reset_update(rcdev, id, true);
+}
+
+static int toprgu_reset_deassert(struct reset_controller_dev *rcdev,
+				 unsigned long id)
+{
+	return toprgu_reset_update(rcdev, id, false);
+}
+
+static int toprgu_reset(struct reset_controller_dev *rcdev,
+			unsigned long id)
+{
+	int ret;
+
+	ret = toprgu_reset_assert(rcdev, id);
+	if (ret)
+		return ret;
+
+	return toprgu_reset_deassert(rcdev, id);
+}
+
+static const struct reset_control_ops toprgu_reset_ops = {
+	.assert = toprgu_reset_assert,
+	.deassert = toprgu_reset_deassert,
+	.reset = toprgu_reset,
+};
+
+static int toprgu_register_reset_controller(struct platform_device *pdev,
+					    int rst_num)
+{
+	int ret;
+	struct mtk_wdt_dev *mtk_wdt = platform_get_drvdata(pdev);
+
+	spin_lock_init(&mtk_wdt->lock);
+
+	mtk_wdt->rcdev.owner = THIS_MODULE;
+	mtk_wdt->rcdev.nr_resets = rst_num;
+	mtk_wdt->rcdev.ops = &toprgu_reset_ops;
+	mtk_wdt->rcdev.of_node = pdev->dev.of_node;
+	ret = devm_reset_controller_register(&pdev->dev, &mtk_wdt->rcdev);
+	if (ret != 0)
+		dev_err(&pdev->dev,
+			"couldn't register wdt reset controller: %d\n", ret);
+	return ret;
+}
+
+static int mtk_wdt_restart(struct watchdog_device *wdt_dev,
+			   unsigned long action, void *data)
+{
+	struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
+	void __iomem *wdt_base;
+
+	wdt_base = mtk_wdt->wdt_base;
+
+	while (1) {
+		writel(WDT_SWRST_KEY, wdt_base + WDT_SWRST);
+		mdelay(5);
+	}
+
+	return 0;
+}
+
+static int mtk_wdt_ping(struct watchdog_device *wdt_dev)
+{
+	struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
+	void __iomem *wdt_base = mtk_wdt->wdt_base;
+
+	iowrite32(WDT_RST_RELOAD, wdt_base + WDT_RST);
+
+	return 0;
+}
+
+static int mtk_wdt_set_timeout(struct watchdog_device *wdt_dev,
+				unsigned int timeout)
+{
+	struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
+	void __iomem *wdt_base = mtk_wdt->wdt_base;
+	u32 reg;
+
+	wdt_dev->timeout = timeout;
+	/*
+	 * In dual mode, irq will be triggered at timeout / 2
+	 * the real timeout occurs at timeout
+	 */
+	if (wdt_dev->pretimeout)
+		wdt_dev->pretimeout = timeout / 2;
+
+	/*
+	 * One bit is the value of 512 ticks
+	 * The clock has 32 KHz
+	 */
+	reg = WDT_LENGTH_TIMEOUT((timeout - wdt_dev->pretimeout) << 6)
+			| WDT_LENGTH_KEY;
+	iowrite32(reg, wdt_base + WDT_LENGTH);
+
+	mtk_wdt_ping(wdt_dev);
+
+	return 0;
+}
+
+static void mtk_wdt_init(struct watchdog_device *wdt_dev)
+{
+	struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
+	void __iomem *wdt_base;
+
+	wdt_base = mtk_wdt->wdt_base;
+
+	if (readl(wdt_base + WDT_MODE) & WDT_MODE_EN) {
+		set_bit(WDOG_HW_RUNNING, &wdt_dev->status);
+		mtk_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+	}
+}
+
+static int mtk_wdt_stop(struct watchdog_device *wdt_dev)
+{
+	struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
+	void __iomem *wdt_base = mtk_wdt->wdt_base;
+	u32 reg;
+
+	reg = readl(wdt_base + WDT_MODE);
+	reg &= ~WDT_MODE_EN;
+	reg |= WDT_MODE_KEY;
+	iowrite32(reg, wdt_base + WDT_MODE);
+
+	return 0;
+}
+
+static int mtk_wdt_start(struct watchdog_device *wdt_dev)
+{
+	u32 reg;
+	struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
+	void __iomem *wdt_base = mtk_wdt->wdt_base;
+	int ret;
+
+	ret = mtk_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+	if (ret < 0)
+		return ret;
+
+	reg = ioread32(wdt_base + WDT_MODE);
+	if (wdt_dev->pretimeout)
+		reg |= (WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN);
+	else
+		reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN);
+	if (mtk_wdt->disable_wdt_extrst)
+		reg &= ~WDT_MODE_EXRST_EN;
+	reg |= (WDT_MODE_EN | WDT_MODE_KEY);
+	iowrite32(reg, wdt_base + WDT_MODE);
+
+	return 0;
+}
+
+static int mtk_wdt_set_pretimeout(struct watchdog_device *wdd,
+				  unsigned int timeout)
+{
+	struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdd);
+	void __iomem *wdt_base = mtk_wdt->wdt_base;
+	u32 reg = ioread32(wdt_base + WDT_MODE);
+
+	if (timeout && !wdd->pretimeout) {
+		wdd->pretimeout = wdd->timeout / 2;
+		reg |= (WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN);
+	} else if (!timeout && wdd->pretimeout) {
+		wdd->pretimeout = 0;
+		reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN);
+	} else {
+		return 0;
+	}
+
+	reg |= WDT_MODE_KEY;
+	iowrite32(reg, wdt_base + WDT_MODE);
+
+	return mtk_wdt_set_timeout(wdd, wdd->timeout);
+}
+
+static irqreturn_t mtk_wdt_isr(int irq, void *arg)
+{
+	struct watchdog_device *wdd = arg;
+
+	watchdog_notify_pretimeout(wdd);
+
+	return IRQ_HANDLED;
+}
+
+static const struct watchdog_info mtk_wdt_info = {
+	.identity	= DRV_NAME,
+	.options	= WDIOF_SETTIMEOUT |
+			  WDIOF_KEEPALIVEPING |
+			  WDIOF_MAGICCLOSE,
+};
+
+static const struct watchdog_info mtk_wdt_pt_info = {
+	.identity	= DRV_NAME,
+	.options	= WDIOF_SETTIMEOUT |
+			  WDIOF_PRETIMEOUT |
+			  WDIOF_KEEPALIVEPING |
+			  WDIOF_MAGICCLOSE,
+};
+
+static const struct watchdog_ops mtk_wdt_ops = {
+	.owner		= THIS_MODULE,
+	.start		= mtk_wdt_start,
+	.stop		= mtk_wdt_stop,
+	.ping		= mtk_wdt_ping,
+	.set_timeout	= mtk_wdt_set_timeout,
+	.set_pretimeout	= mtk_wdt_set_pretimeout,
+	.restart	= mtk_wdt_restart,
+};
+
+static int mtk_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mtk_wdt_dev *mtk_wdt;
+	const struct mtk_wdt_data *wdt_data;
+	int err, irq;
+
+	mtk_wdt = devm_kzalloc(dev, sizeof(*mtk_wdt), GFP_KERNEL);
+	if (!mtk_wdt)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, mtk_wdt);
+
+	mtk_wdt->wdt_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(mtk_wdt->wdt_base))
+		return PTR_ERR(mtk_wdt->wdt_base);
+
+	irq = platform_get_irq_optional(pdev, 0);
+	if (irq > 0) {
+		err = devm_request_irq(&pdev->dev, irq, mtk_wdt_isr, 0, "wdt_bark",
+				       &mtk_wdt->wdt_dev);
+		if (err)
+			return err;
+
+		mtk_wdt->wdt_dev.info = &mtk_wdt_pt_info;
+		mtk_wdt->wdt_dev.pretimeout = WDT_MAX_TIMEOUT / 2;
+	} else {
+		if (irq == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+
+		mtk_wdt->wdt_dev.info = &mtk_wdt_info;
+	}
+
+	mtk_wdt->wdt_dev.ops = &mtk_wdt_ops;
+	mtk_wdt->wdt_dev.timeout = WDT_MAX_TIMEOUT;
+	mtk_wdt->wdt_dev.max_hw_heartbeat_ms = WDT_MAX_TIMEOUT * 1000;
+	mtk_wdt->wdt_dev.min_timeout = WDT_MIN_TIMEOUT;
+	mtk_wdt->wdt_dev.parent = dev;
+
+	watchdog_init_timeout(&mtk_wdt->wdt_dev, timeout, dev);
+	watchdog_set_nowayout(&mtk_wdt->wdt_dev, nowayout);
+	watchdog_set_restart_priority(&mtk_wdt->wdt_dev, 128);
+
+	watchdog_set_drvdata(&mtk_wdt->wdt_dev, mtk_wdt);
+
+	mtk_wdt_init(&mtk_wdt->wdt_dev);
+
+	watchdog_stop_on_reboot(&mtk_wdt->wdt_dev);
+	err = devm_watchdog_register_device(dev, &mtk_wdt->wdt_dev);
+	if (unlikely(err))
+		return err;
+
+	dev_info(dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)\n",
+		 mtk_wdt->wdt_dev.timeout, nowayout);
+
+	wdt_data = of_device_get_match_data(dev);
+	if (wdt_data) {
+		err = toprgu_register_reset_controller(pdev,
+						       wdt_data->toprgu_sw_rst_num);
+		if (err)
+			return err;
+	}
+
+	mtk_wdt->disable_wdt_extrst =
+		of_property_read_bool(dev->of_node, "mediatek,disable-extrst");
+
+	return 0;
+}
+
+static int mtk_wdt_suspend(struct device *dev)
+{
+	struct mtk_wdt_dev *mtk_wdt = dev_get_drvdata(dev);
+
+	if (watchdog_active(&mtk_wdt->wdt_dev))
+		mtk_wdt_stop(&mtk_wdt->wdt_dev);
+
+	return 0;
+}
+
+static int mtk_wdt_resume(struct device *dev)
+{
+	struct mtk_wdt_dev *mtk_wdt = dev_get_drvdata(dev);
+
+	if (watchdog_active(&mtk_wdt->wdt_dev)) {
+		mtk_wdt_start(&mtk_wdt->wdt_dev);
+		mtk_wdt_ping(&mtk_wdt->wdt_dev);
+	}
+
+	return 0;
+}
+
+static const struct of_device_id mtk_wdt_dt_ids[] = {
+	{ .compatible = "mediatek,mt2712-wdt", .data = &mt2712_data },
+	{ .compatible = "mediatek,mt6589-wdt" },
+	{ .compatible = "mediatek,mt7986-wdt", .data = &mt7986_data },
+	{ .compatible = "mediatek,mt8183-wdt", .data = &mt8183_data },
+	{ .compatible = "mediatek,mt8186-wdt", .data = &mt8186_data },
+	{ .compatible = "mediatek,mt8192-wdt", .data = &mt8192_data },
+	{ .compatible = "mediatek,mt8195-wdt", .data = &mt8195_data },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mtk_wdt_dt_ids);
+
+static DEFINE_SIMPLE_DEV_PM_OPS(mtk_wdt_pm_ops,
+				mtk_wdt_suspend, mtk_wdt_resume);
+
+static struct platform_driver mtk_wdt_driver = {
+	.probe		= mtk_wdt_probe,
+	.driver		= {
+		.name		= DRV_NAME,
+		.pm		= pm_sleep_ptr(&mtk_wdt_pm_ops),
+		.of_match_table	= mtk_wdt_dt_ids,
+	},
+};
+
+module_platform_driver(mtk_wdt_driver);
+
+module_param(timeout, uint, 0);
+MODULE_PARM_DESC(timeout, "Watchdog heartbeat in seconds");
+
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+			__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Matthias Brugger <matthias.bgg@gmail.com>");
+MODULE_DESCRIPTION("Mediatek WatchDog Timer Driver");
+MODULE_VERSION(DRV_VERSION);