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Message-Id: <20220310195229.109477-3-nick.hawkins@hpe.com>
Date: Thu, 10 Mar 2022 13:52:22 -0600
From: nick.hawkins@....com
To: verdun@....com
Cc: Nick Hawkins <nick.hawkins@....com>,
Wim Van Sebroeck <wim@...ux-watchdog.org>,
Guenter Roeck <linux@...ck-us.net>,
linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: [PATCH v3 03/10] drivers: wdt: Introduce HPE GXP SoC Watchdog
From: Nick Hawkins <nick.hawkins@....com>
Adding support for the HPE GXP Watchdog. It is new to the linux
community and this along with several other patches is the first
support for it. The GXP asic contains a full compliment of
timers one of which is the watchdog timer. The watchdog timer
is 16 bit and has 10ms resolution.
Signed-off-by: Nick Hawkins <nick.hawkins@....com>
---
drivers/watchdog/Kconfig | 8 ++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/gxp-wdt.c | 191 +++++++++++++++++++++++++++++++++++++
3 files changed, 200 insertions(+)
create mode 100644 drivers/watchdog/gxp-wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index c8fa79da23b3..cb210d2978d2 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1820,6 +1820,14 @@ config RALINK_WDT
help
Hardware driver for the Ralink SoC Watchdog Timer.
+config GXP_WATCHDOG
+ tristate "HPE GXP watchdog support"
+ depends on ARCH_HPE_GXP
+ select WATCHDOG_CORE
+ help
+ Say Y here to include support for the watchdog timer
+ in HPE GXP SoCs.
+
config MT7621_WDT
tristate "Mediatek SoC watchdog"
select WATCHDOG_CORE
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index f7da867e8782..e2acf3a0d0fc 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -92,6 +92,7 @@ obj-$(CONFIG_RTD119X_WATCHDOG) += rtd119x_wdt.o
obj-$(CONFIG_SPRD_WATCHDOG) += sprd_wdt.o
obj-$(CONFIG_PM8916_WATCHDOG) += pm8916_wdt.o
obj-$(CONFIG_ARM_SMC_WATCHDOG) += arm_smc_wdt.o
+obj-$(CONFIG_GXP_WATCHDOG) += gxp-wdt.o
obj-$(CONFIG_VISCONTI_WATCHDOG) += visconti_wdt.o
obj-$(CONFIG_MSC313E_WATCHDOG) += msc313e_wdt.o
obj-$(CONFIG_APPLE_WATCHDOG) += apple_wdt.o
diff --git a/drivers/watchdog/gxp-wdt.c b/drivers/watchdog/gxp-wdt.c
new file mode 100644
index 000000000000..d2b489cb4774
--- /dev/null
+++ b/drivers/watchdog/gxp-wdt.c
@@ -0,0 +1,191 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2022 Hewlett-Packard Enterprise Development Company, L.P.
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+#define MASK_WDGCS_ENABLE 0x01
+#define MASK_WDGCS_RELOAD 0x04
+#define MASK_WDGCS_NMIEN 0x08
+#define MASK_WDGCS_WARN 0x80
+
+#define WDT_MAX_TIMEOUT_MS 655000
+#define WDT_DEFAULT_TIMEOUT 30
+#define SECS_TO_WDOG_TICKS(x) ((x) * 100)
+#define WDOG_TICKS_TO_SECS(x) ((x) / 100)
+
+struct gxp_wdt {
+ void __iomem *counter;
+ void __iomem *control;
+ struct watchdog_device wdd;
+};
+
+static void gxp_wdt_enable_reload(struct gxp_wdt *drvdata)
+{
+ uint8_t val;
+
+ val = readb(drvdata->control);
+ val |= (MASK_WDGCS_ENABLE | MASK_WDGCS_RELOAD);
+ writeb(val, drvdata->control);
+}
+
+static int gxp_wdt_start(struct watchdog_device *wdd)
+{
+ struct gxp_wdt *drvdata = watchdog_get_drvdata(wdd);
+
+ writew((SECS_TO_WDOG_TICKS(wdd->timeout)), drvdata->counter);
+ gxp_wdt_enable_reload(drvdata);
+ return 0;
+}
+
+static int gxp_wdt_stop(struct watchdog_device *wdd)
+{
+ struct gxp_wdt *drvdata = watchdog_get_drvdata(wdd);
+ uint8_t val;
+
+ val = readb_relaxed(drvdata->control);
+ val &= ~MASK_WDGCS_ENABLE;
+ writeb(val, drvdata->control);
+ return 0;
+}
+
+static int gxp_wdt_set_timeout(struct watchdog_device *wdd,
+ unsigned int timeout)
+{
+ struct gxp_wdt *drvdata = watchdog_get_drvdata(wdd);
+ uint32_t actual;
+
+ wdd->timeout = timeout;
+ actual = min(timeout, wdd->max_hw_heartbeat_ms / 1000);
+ writew((SECS_TO_WDOG_TICKS(actual)), drvdata->counter);
+
+ return 0;
+}
+
+static unsigned int gxp_wdt_get_timeleft(struct watchdog_device *wdd)
+{
+ struct gxp_wdt *drvdata = watchdog_get_drvdata(wdd);
+ uint32_t val = readw(drvdata->counter);
+
+ return WDOG_TICKS_TO_SECS(val);
+}
+
+static int gxp_wdt_ping(struct watchdog_device *wdd)
+{
+ struct gxp_wdt *drvdata = watchdog_get_drvdata(wdd);
+
+ gxp_wdt_enable_reload(drvdata);
+ return 0;
+}
+
+static int gxp_restart(struct watchdog_device *wdd, unsigned long action,
+ void *data)
+{
+ struct gxp_wdt *drvdata = watchdog_get_drvdata(wdd);
+
+ writew(10, drvdata->counter);
+ gxp_wdt_enable_reload(drvdata);
+ mdelay(100);
+ return 0;
+}
+
+static const struct watchdog_ops gxp_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = gxp_wdt_start,
+ .stop = gxp_wdt_stop,
+ .ping = gxp_wdt_ping,
+ .set_timeout = gxp_wdt_set_timeout,
+ .get_timeleft = gxp_wdt_get_timeleft,
+ .restart = gxp_restart,
+};
+
+static const struct watchdog_info gxp_wdt_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
+ .identity = "HPE GXP Watchdog timer",
+};
+
+static int gxp_wdt_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct device *dev = &pdev->dev;
+ struct gxp_wdt *drvdata;
+ int err;
+ uint8_t val;
+
+ drvdata = devm_kzalloc(dev, sizeof(struct gxp_wdt), GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, drvdata);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ drvdata->counter = devm_ioremap_resource(dev, res);
+ if (IS_ERR(drvdata->counter))
+ return PTR_ERR(drvdata->counter);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ drvdata->control = devm_ioremap_resource(dev, res);
+ if (IS_ERR(drvdata->control))
+ return PTR_ERR(drvdata->control);
+
+ drvdata->wdd.info = &gxp_wdt_info;
+ drvdata->wdd.ops = &gxp_wdt_ops;
+ drvdata->wdd.max_hw_heartbeat_ms = WDT_MAX_TIMEOUT_MS;
+ drvdata->wdd.parent = &pdev->dev;
+
+ watchdog_set_drvdata(&drvdata->wdd, drvdata);
+ watchdog_init_timeout(&drvdata->wdd, WDT_DEFAULT_TIMEOUT, dev);
+ watchdog_set_nowayout(&drvdata->wdd, WATCHDOG_NOWAYOUT);
+
+ val = readb(drvdata->control);
+ if (val & MASK_WDGCS_ENABLE)
+ set_bit(WDOG_HW_RUNNING, &drvdata->wdd.status);
+
+ watchdog_set_restart_priority(&drvdata->wdd, 128);
+
+ watchdog_stop_on_reboot(&drvdata->wdd);
+ err = devm_watchdog_register_device(dev, &drvdata->wdd);
+ if (err) {
+ dev_err(dev, "Failed to register watchdog device");
+ return err;
+ }
+
+ dev_info(dev, "HPE GXP watchdog timer");
+ return 0;
+}
+
+static int gxp_wdt_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static const struct of_device_id gxp_wdt_of_match[] = {
+ { .compatible = "hpe,gxp-wdt", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, gxp_wdt_of_match);
+
+static struct platform_driver gxp_wdt_driver = {
+ .probe = gxp_wdt_probe,
+ .remove = gxp_wdt_remove,
+ .driver = {
+ .name = "gxp-wdt",
+ .of_match_table = gxp_wdt_of_match,
+ },
+};
+module_platform_driver(gxp_wdt_driver);
+
+MODULE_AUTHOR("Nick Hawkins <nick.hawkins@....com>");
+MODULE_AUTHOR("Jean-Marie Verdun <verdun@....com>");
+MODULE_DESCRIPTION("Driver for GXP watchdog timer");
--
2.17.1
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