OpenWrt – Rev 4
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From c197a5a04d658da490de08636066a6bdbebf16c5 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Mon, 16 Oct 2017 22:54:24 +0200
Subject: [PATCH 18/31] watchdog: gemini/ftwdt010: rename driver and symbols
This renames all the driver files and symbols for the Gemini
watchdog to FTWDT010 as it has been revealed that this IP block
is a generic watchdog timer from Faraday Technology used in
several SoC designs.
Select this driver by default for the Gemini, it is a sensible
driver to always have enabled.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
---
drivers/watchdog/Kconfig | 14 +--
drivers/watchdog/Makefile | 2 +-
drivers/watchdog/{gemini_wdt.c => ftwdt010_wdt.c} | 117 +++++++++++-----------
3 files changed, 68 insertions(+), 65 deletions(-)
rename drivers/watchdog/{gemini_wdt.c => ftwdt010_wdt.c} (50%)
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -321,16 +321,18 @@ config 977_WATCHDOG
Not sure? It's safe to say N.
-config GEMINI_WATCHDOG
- tristate "Gemini watchdog"
- depends on ARCH_GEMINI
+config FTWDT010_WATCHDOG
+ tristate "Faraday Technology FTWDT010 watchdog"
+ depends on ARM || COMPILE_TEST
select WATCHDOG_CORE
+ default ARCH_GEMINI
help
- Say Y here if to include support for the watchdog timer
- embedded in the Cortina Systems Gemini family of devices.
+ Say Y here if to include support for the Faraday Technology
+ FTWDT010 watchdog timer embedded in the Cortina Systems Gemini
+ family of devices.
To compile this driver as a module, choose M here: the
- module will be called gemini_wdt.
+ module will be called ftwdt010_wdt.
config IXP4XX_WATCHDOG
tristate "IXP4xx Watchdog"
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -46,7 +46,7 @@ obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.
obj-$(CONFIG_TWL4030_WATCHDOG) += twl4030_wdt.o
obj-$(CONFIG_21285_WATCHDOG) += wdt285.o
obj-$(CONFIG_977_WATCHDOG) += wdt977.o
-obj-$(CONFIG_GEMINI_WATCHDOG) += gemini_wdt.o
+obj-$(CONFIG_FTWDT010_WATCHDOG) += ftwdt010_wdt.o
obj-$(CONFIG_IXP4XX_WATCHDOG) += ixp4xx_wdt.o
obj-$(CONFIG_KS8695_WATCHDOG) += ks8695_wdt.o
obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
--- a/drivers/watchdog/gemini_wdt.c
+++ /dev/null
@@ -1,229 +0,0 @@
-/*
- * Watchdog driver for Cortina Systems Gemini SoC
- *
- * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
- *
- * Inspired by the out-of-tree drivers from OpenWRT:
- * Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
- *
- * 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/bitops.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/of_device.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/watchdog.h>
-
-#define GEMINI_WDCOUNTER 0x0
-#define GEMINI_WDLOAD 0x4
-#define GEMINI_WDRESTART 0x8
-#define GEMINI_WDCR 0xC
-
-#define WDRESTART_MAGIC 0x5AB9
-
-#define WDCR_CLOCK_5MHZ BIT(4)
-#define WDCR_SYS_RST BIT(1)
-#define WDCR_ENABLE BIT(0)
-
-#define WDT_CLOCK 5000000 /* 5 MHz */
-
-struct gemini_wdt {
- struct watchdog_device wdd;
- struct device *dev;
- void __iomem *base;
-};
-
-static inline
-struct gemini_wdt *to_gemini_wdt(struct watchdog_device *wdd)
-{
- return container_of(wdd, struct gemini_wdt, wdd);
-}
-
-static int gemini_wdt_start(struct watchdog_device *wdd)
-{
- struct gemini_wdt *gwdt = to_gemini_wdt(wdd);
-
- writel(wdd->timeout * WDT_CLOCK, gwdt->base + GEMINI_WDLOAD);
- writel(WDRESTART_MAGIC, gwdt->base + GEMINI_WDRESTART);
- /* set clock before enabling */
- writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST,
- gwdt->base + GEMINI_WDCR);
- writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST | WDCR_ENABLE,
- gwdt->base + GEMINI_WDCR);
-
- return 0;
-}
-
-static int gemini_wdt_stop(struct watchdog_device *wdd)
-{
- struct gemini_wdt *gwdt = to_gemini_wdt(wdd);
-
- writel(0, gwdt->base + GEMINI_WDCR);
-
- return 0;
-}
-
-static int gemini_wdt_ping(struct watchdog_device *wdd)
-{
- struct gemini_wdt *gwdt = to_gemini_wdt(wdd);
-
- writel(WDRESTART_MAGIC, gwdt->base + GEMINI_WDRESTART);
-
- return 0;
-}
-
-static int gemini_wdt_set_timeout(struct watchdog_device *wdd,
- unsigned int timeout)
-{
- wdd->timeout = timeout;
- if (watchdog_active(wdd))
- gemini_wdt_start(wdd);
-
- return 0;
-}
-
-static irqreturn_t gemini_wdt_interrupt(int irq, void *data)
-{
- struct gemini_wdt *gwdt = data;
-
- watchdog_notify_pretimeout(&gwdt->wdd);
-
- return IRQ_HANDLED;
-}
-
-static const struct watchdog_ops gemini_wdt_ops = {
- .start = gemini_wdt_start,
- .stop = gemini_wdt_stop,
- .ping = gemini_wdt_ping,
- .set_timeout = gemini_wdt_set_timeout,
- .owner = THIS_MODULE,
-};
-
-static const struct watchdog_info gemini_wdt_info = {
- .options = WDIOF_KEEPALIVEPING
- | WDIOF_MAGICCLOSE
- | WDIOF_SETTIMEOUT,
- .identity = KBUILD_MODNAME,
-};
-
-
-static int gemini_wdt_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct resource *res;
- struct gemini_wdt *gwdt;
- unsigned int reg;
- int irq;
- int ret;
-
- gwdt = devm_kzalloc(dev, sizeof(*gwdt), GFP_KERNEL);
- if (!gwdt)
- return -ENOMEM;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- gwdt->base = devm_ioremap_resource(dev, res);
- if (IS_ERR(gwdt->base))
- return PTR_ERR(gwdt->base);
-
- irq = platform_get_irq(pdev, 0);
- if (!irq)
- return -EINVAL;
-
- gwdt->dev = dev;
- gwdt->wdd.info = &gemini_wdt_info;
- gwdt->wdd.ops = &gemini_wdt_ops;
- gwdt->wdd.min_timeout = 1;
- gwdt->wdd.max_timeout = 0xFFFFFFFF / WDT_CLOCK;
- gwdt->wdd.parent = dev;
-
- /*
- * If 'timeout-sec' unspecified in devicetree, assume a 13 second
- * default.
- */
- gwdt->wdd.timeout = 13U;
- watchdog_init_timeout(&gwdt->wdd, 0, dev);
-
- reg = readw(gwdt->base + GEMINI_WDCR);
- if (reg & WDCR_ENABLE) {
- /* Watchdog was enabled by the bootloader, disable it. */
- reg &= ~WDCR_ENABLE;
- writel(reg, gwdt->base + GEMINI_WDCR);
- }
-
- ret = devm_request_irq(dev, irq, gemini_wdt_interrupt, 0,
- "watchdog bark", gwdt);
- if (ret)
- return ret;
-
- ret = devm_watchdog_register_device(dev, &gwdt->wdd);
- if (ret) {
- dev_err(&pdev->dev, "failed to register watchdog\n");
- return ret;
- }
-
- /* Set up platform driver data */
- platform_set_drvdata(pdev, gwdt);
- dev_info(dev, "Gemini watchdog driver enabled\n");
-
- return 0;
-}
-
-static int __maybe_unused gemini_wdt_suspend(struct device *dev)
-{
- struct gemini_wdt *gwdt = dev_get_drvdata(dev);
- unsigned int reg;
-
- reg = readw(gwdt->base + GEMINI_WDCR);
- reg &= ~WDCR_ENABLE;
- writel(reg, gwdt->base + GEMINI_WDCR);
-
- return 0;
-}
-
-static int __maybe_unused gemini_wdt_resume(struct device *dev)
-{
- struct gemini_wdt *gwdt = dev_get_drvdata(dev);
- unsigned int reg;
-
- if (watchdog_active(&gwdt->wdd)) {
- reg = readw(gwdt->base + GEMINI_WDCR);
- reg |= WDCR_ENABLE;
- writel(reg, gwdt->base + GEMINI_WDCR);
- }
-
- return 0;
-}
-
-static const struct dev_pm_ops gemini_wdt_dev_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(gemini_wdt_suspend,
- gemini_wdt_resume)
-};
-
-#ifdef CONFIG_OF
-static const struct of_device_id gemini_wdt_match[] = {
- { .compatible = "cortina,gemini-watchdog" },
- {},
-};
-MODULE_DEVICE_TABLE(of, gemini_wdt_match);
-#endif
-
-static struct platform_driver gemini_wdt_driver = {
- .probe = gemini_wdt_probe,
- .driver = {
- .name = "gemini-wdt",
- .of_match_table = of_match_ptr(gemini_wdt_match),
- .pm = &gemini_wdt_dev_pm_ops,
- },
-};
-module_platform_driver(gemini_wdt_driver);
-MODULE_AUTHOR("Linus Walleij");
-MODULE_DESCRIPTION("Watchdog driver for Gemini");
-MODULE_LICENSE("GPL");
--- /dev/null
+++ b/drivers/watchdog/ftwdt010_wdt.c
@@ -0,0 +1,230 @@
+/*
+ * Watchdog driver for Faraday Technology FTWDT010
+ *
+ * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
+ *
+ * Inspired by the out-of-tree drivers from OpenWRT:
+ * Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
+ *
+ * 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/bitops.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/watchdog.h>
+
+#define FTWDT010_WDCOUNTER 0x0
+#define FTWDT010_WDLOAD 0x4
+#define FTWDT010_WDRESTART 0x8
+#define FTWDT010_WDCR 0xC
+
+#define WDRESTART_MAGIC 0x5AB9
+
+#define WDCR_CLOCK_5MHZ BIT(4)
+#define WDCR_SYS_RST BIT(1)
+#define WDCR_ENABLE BIT(0)
+
+#define WDT_CLOCK 5000000 /* 5 MHz */
+
+struct ftwdt010_wdt {
+ struct watchdog_device wdd;
+ struct device *dev;
+ void __iomem *base;
+};
+
+static inline
+struct ftwdt010_wdt *to_ftwdt010_wdt(struct watchdog_device *wdd)
+{
+ return container_of(wdd, struct ftwdt010_wdt, wdd);
+}
+
+static int ftwdt010_wdt_start(struct watchdog_device *wdd)
+{
+ struct ftwdt010_wdt *gwdt = to_ftwdt010_wdt(wdd);
+
+ writel(wdd->timeout * WDT_CLOCK, gwdt->base + FTWDT010_WDLOAD);
+ writel(WDRESTART_MAGIC, gwdt->base + FTWDT010_WDRESTART);
+ /* set clock before enabling */
+ writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST,
+ gwdt->base + FTWDT010_WDCR);
+ writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST | WDCR_ENABLE,
+ gwdt->base + FTWDT010_WDCR);
+
+ return 0;
+}
+
+static int ftwdt010_wdt_stop(struct watchdog_device *wdd)
+{
+ struct ftwdt010_wdt *gwdt = to_ftwdt010_wdt(wdd);
+
+ writel(0, gwdt->base + FTWDT010_WDCR);
+
+ return 0;
+}
+
+static int ftwdt010_wdt_ping(struct watchdog_device *wdd)
+{
+ struct ftwdt010_wdt *gwdt = to_ftwdt010_wdt(wdd);
+
+ writel(WDRESTART_MAGIC, gwdt->base + FTWDT010_WDRESTART);
+
+ return 0;
+}
+
+static int ftwdt010_wdt_set_timeout(struct watchdog_device *wdd,
+ unsigned int timeout)
+{
+ wdd->timeout = timeout;
+ if (watchdog_active(wdd))
+ ftwdt010_wdt_start(wdd);
+
+ return 0;
+}
+
+static irqreturn_t ftwdt010_wdt_interrupt(int irq, void *data)
+{
+ struct ftwdt010_wdt *gwdt = data;
+
+ watchdog_notify_pretimeout(&gwdt->wdd);
+
+ return IRQ_HANDLED;
+}
+
+static const struct watchdog_ops ftwdt010_wdt_ops = {
+ .start = ftwdt010_wdt_start,
+ .stop = ftwdt010_wdt_stop,
+ .ping = ftwdt010_wdt_ping,
+ .set_timeout = ftwdt010_wdt_set_timeout,
+ .owner = THIS_MODULE,
+};
+
+static const struct watchdog_info ftwdt010_wdt_info = {
+ .options = WDIOF_KEEPALIVEPING
+ | WDIOF_MAGICCLOSE
+ | WDIOF_SETTIMEOUT,
+ .identity = KBUILD_MODNAME,
+};
+
+
+static int ftwdt010_wdt_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct ftwdt010_wdt *gwdt;
+ unsigned int reg;
+ int irq;
+ int ret;
+
+ gwdt = devm_kzalloc(dev, sizeof(*gwdt), GFP_KERNEL);
+ if (!gwdt)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ gwdt->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(gwdt->base))
+ return PTR_ERR(gwdt->base);
+
+ irq = platform_get_irq(pdev, 0);
+ if (!irq)
+ return -EINVAL;
+
+ gwdt->dev = dev;
+ gwdt->wdd.info = &ftwdt010_wdt_info;
+ gwdt->wdd.ops = &ftwdt010_wdt_ops;
+ gwdt->wdd.min_timeout = 1;
+ gwdt->wdd.max_timeout = 0xFFFFFFFF / WDT_CLOCK;
+ gwdt->wdd.parent = dev;
+
+ /*
+ * If 'timeout-sec' unspecified in devicetree, assume a 13 second
+ * default.
+ */
+ gwdt->wdd.timeout = 13U;
+ watchdog_init_timeout(&gwdt->wdd, 0, dev);
+
+ reg = readw(gwdt->base + FTWDT010_WDCR);
+ if (reg & WDCR_ENABLE) {
+ /* Watchdog was enabled by the bootloader, disable it. */
+ reg &= ~WDCR_ENABLE;
+ writel(reg, gwdt->base + FTWDT010_WDCR);
+ }
+
+ ret = devm_request_irq(dev, irq, ftwdt010_wdt_interrupt, 0,
+ "watchdog bark", gwdt);
+ if (ret)
+ return ret;
+
+ ret = devm_watchdog_register_device(dev, &gwdt->wdd);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register watchdog\n");
+ return ret;
+ }
+
+ /* Set up platform driver data */
+ platform_set_drvdata(pdev, gwdt);
+ dev_info(dev, "FTWDT010 watchdog driver enabled\n");
+
+ return 0;
+}
+
+static int __maybe_unused ftwdt010_wdt_suspend(struct device *dev)
+{
+ struct ftwdt010_wdt *gwdt = dev_get_drvdata(dev);
+ unsigned int reg;
+
+ reg = readw(gwdt->base + FTWDT010_WDCR);
+ reg &= ~WDCR_ENABLE;
+ writel(reg, gwdt->base + FTWDT010_WDCR);
+
+ return 0;
+}
+
+static int __maybe_unused ftwdt010_wdt_resume(struct device *dev)
+{
+ struct ftwdt010_wdt *gwdt = dev_get_drvdata(dev);
+ unsigned int reg;
+
+ if (watchdog_active(&gwdt->wdd)) {
+ reg = readw(gwdt->base + FTWDT010_WDCR);
+ reg |= WDCR_ENABLE;
+ writel(reg, gwdt->base + FTWDT010_WDCR);
+ }
+
+ return 0;
+}
+
+static const struct dev_pm_ops ftwdt010_wdt_dev_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(ftwdt010_wdt_suspend,
+ ftwdt010_wdt_resume)
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id ftwdt010_wdt_match[] = {
+ { .compatible = "faraday,ftwdt010" },
+ { .compatible = "cortina,gemini-watchdog" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ftwdt010_wdt_match);
+#endif
+
+static struct platform_driver ftwdt010_wdt_driver = {
+ .probe = ftwdt010_wdt_probe,
+ .driver = {
+ .name = "ftwdt010-wdt",
+ .of_match_table = of_match_ptr(ftwdt010_wdt_match),
+ .pm = &ftwdt010_wdt_dev_pm_ops,
+ },
+};
+module_platform_driver(ftwdt010_wdt_driver);
+MODULE_AUTHOR("Linus Walleij");
+MODULE_DESCRIPTION("Watchdog driver for Faraday Technology FTWDT010");
+MODULE_LICENSE("GPL");
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