diff options
Diffstat (limited to 'drivers/watchdog/gemini_wdt.c')
| -rw-r--r-- | drivers/watchdog/gemini_wdt.c | 229 |
1 files changed, 0 insertions, 229 deletions
diff --git a/drivers/watchdog/gemini_wdt.c b/drivers/watchdog/gemini_wdt.c deleted file mode 100644 index 8155aa619e4c..000000000000 --- 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"); |