Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 221 insertions, 0 deletions

diff --git a/drivers/watchdog/atlas7_wdt.c b/drivers/watchdog/atlas7_wdt.c
new file mode 100644
index 000000000..9bfe650d8
--- /dev/null
+++ b/drivers/watchdog/atlas7_wdt.c
@@ -0,0 +1,221 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Watchdog driver for CSR Atlas7
+ *
+ * Copyright (c) 2015 Cambridge Silicon Radio Limited, a CSR plc group company.
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+
+#define ATLAS7_TIMER_WDT_INDEX		5
+#define ATLAS7_WDT_DEFAULT_TIMEOUT	20
+
+#define ATLAS7_WDT_CNT_CTRL	(0 + 4 * ATLAS7_TIMER_WDT_INDEX)
+#define ATLAS7_WDT_CNT_MATCH	(0x18 + 4 * ATLAS7_TIMER_WDT_INDEX)
+#define ATLAS7_WDT_CNT		(0x48 +  4 * ATLAS7_TIMER_WDT_INDEX)
+#define ATLAS7_WDT_CNT_EN	(BIT(0) | BIT(1))
+#define ATLAS7_WDT_EN		0x64
+
+static unsigned int timeout = ATLAS7_WDT_DEFAULT_TIMEOUT;
+static bool nowayout = WATCHDOG_NOWAYOUT;
+
+module_param(timeout, uint, 0);
+module_param(nowayout, bool, 0);
+
+MODULE_PARM_DESC(timeout, "Default watchdog timeout (in seconds)");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+			__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+struct atlas7_wdog {
+	struct device *dev;
+	void __iomem *base;
+	unsigned long tick_rate;
+	struct clk *clk;
+};
+
+static unsigned int atlas7_wdt_gettimeleft(struct watchdog_device *wdd)
+{
+	struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
+	u32 counter, match, delta;
+
+	counter = readl(wdt->base + ATLAS7_WDT_CNT);
+	match = readl(wdt->base + ATLAS7_WDT_CNT_MATCH);
+	delta = match - counter;
+
+	return  delta / wdt->tick_rate;
+}
+
+static int atlas7_wdt_ping(struct watchdog_device *wdd)
+{
+	struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
+	u32 counter, match, delta;
+
+	counter = readl(wdt->base + ATLAS7_WDT_CNT);
+	delta = wdd->timeout * wdt->tick_rate;
+	match = counter + delta;
+
+	writel(match, wdt->base + ATLAS7_WDT_CNT_MATCH);
+
+	return 0;
+}
+
+static int atlas7_wdt_enable(struct watchdog_device *wdd)
+{
+	struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
+
+	atlas7_wdt_ping(wdd);
+
+	writel(readl(wdt->base + ATLAS7_WDT_CNT_CTRL) | ATLAS7_WDT_CNT_EN,
+	      wdt->base + ATLAS7_WDT_CNT_CTRL);
+	writel(1, wdt->base + ATLAS7_WDT_EN);
+
+	return 0;
+}
+
+static int atlas7_wdt_disable(struct watchdog_device *wdd)
+{
+	struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
+
+	writel(0, wdt->base + ATLAS7_WDT_EN);
+	writel(readl(wdt->base + ATLAS7_WDT_CNT_CTRL) & ~ATLAS7_WDT_CNT_EN,
+	      wdt->base + ATLAS7_WDT_CNT_CTRL);
+
+	return 0;
+}
+
+static int atlas7_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
+{
+	wdd->timeout = to;
+
+	return 0;
+}
+
+#define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE)
+
+static const struct watchdog_info atlas7_wdt_ident = {
+	.options = OPTIONS,
+	.firmware_version = 0,
+	.identity = "atlas7 Watchdog",
+};
+
+static const struct watchdog_ops atlas7_wdt_ops = {
+	.owner = THIS_MODULE,
+	.start = atlas7_wdt_enable,
+	.stop = atlas7_wdt_disable,
+	.get_timeleft = atlas7_wdt_gettimeleft,
+	.ping = atlas7_wdt_ping,
+	.set_timeout = atlas7_wdt_settimeout,
+};
+
+static struct watchdog_device atlas7_wdd = {
+	.info = &atlas7_wdt_ident,
+	.ops = &atlas7_wdt_ops,
+	.timeout = ATLAS7_WDT_DEFAULT_TIMEOUT,
+};
+
+static const struct of_device_id atlas7_wdt_ids[] = {
+	{ .compatible = "sirf,atlas7-tick"},
+	{}
+};
+
+static void atlas7_clk_disable_unprepare(void *data)
+{
+	clk_disable_unprepare(data);
+}
+
+static int atlas7_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct atlas7_wdog *wdt;
+	struct clk *clk;
+	int ret;
+
+	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
+	if (!wdt)
+		return -ENOMEM;
+	wdt->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(wdt->base))
+		return PTR_ERR(wdt->base);
+
+	clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+	ret = clk_prepare_enable(clk);
+	if (ret) {
+		dev_err(dev, "clk enable failed\n");
+		return ret;
+	}
+	ret = devm_add_action_or_reset(dev, atlas7_clk_disable_unprepare, clk);
+	if (ret)
+		return ret;
+
+	/* disable watchdog hardware */
+	writel(0, wdt->base + ATLAS7_WDT_CNT_CTRL);
+
+	wdt->tick_rate = clk_get_rate(clk);
+	if (!wdt->tick_rate)
+		return -EINVAL;
+
+	wdt->clk = clk;
+	atlas7_wdd.min_timeout = 1;
+	atlas7_wdd.max_timeout = UINT_MAX / wdt->tick_rate;
+
+	watchdog_init_timeout(&atlas7_wdd, 0, dev);
+	watchdog_set_nowayout(&atlas7_wdd, nowayout);
+
+	watchdog_set_drvdata(&atlas7_wdd, wdt);
+	platform_set_drvdata(pdev, &atlas7_wdd);
+
+	watchdog_stop_on_reboot(&atlas7_wdd);
+	watchdog_stop_on_unregister(&atlas7_wdd);
+	return devm_watchdog_register_device(dev, &atlas7_wdd);
+}
+
+static int __maybe_unused atlas7_wdt_suspend(struct device *dev)
+{
+	/*
+	 * NOTE:timer controller registers settings are saved
+	 * and restored back by the timer-atlas7.c
+	 */
+	return 0;
+}
+
+static int __maybe_unused atlas7_wdt_resume(struct device *dev)
+{
+	struct watchdog_device *wdd = dev_get_drvdata(dev);
+
+	/*
+	 * NOTE: Since timer controller registers settings are saved
+	 * and restored back by the timer-atlas7.c, so we need not
+	 * update WD settings except refreshing timeout.
+	 */
+	atlas7_wdt_ping(wdd);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(atlas7_wdt_pm_ops,
+		atlas7_wdt_suspend, atlas7_wdt_resume);
+
+MODULE_DEVICE_TABLE(of, atlas7_wdt_ids);
+
+static struct platform_driver atlas7_wdt_driver = {
+	.driver = {
+		.name = "atlas7-wdt",
+		.pm = &atlas7_wdt_pm_ops,
+		.of_match_table	= atlas7_wdt_ids,
+	},
+	.probe = atlas7_wdt_probe,
+};
+module_platform_driver(atlas7_wdt_driver);
+
+MODULE_DESCRIPTION("CSRatlas7 watchdog driver");
+MODULE_AUTHOR("Guo Zeng <Guo.Zeng@csr.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:atlas7-wdt");