+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Watchdog driver for CSR SiRFprimaII and SiRFatlasVI
- *
- * Copyright (c) 2013 Cambridge Silicon Radio Limited, a CSR plc group company.
- */
-
-#include <linux/module.h>
-#include <linux/watchdog.h>
-#include <linux/platform_device.h>
-#include <linux/moduleparam.h>
-#include <linux/of.h>
-#include <linux/io.h>
-#include <linux/uaccess.h>
-
-#define CLOCK_FREQ 1000000
-
-#define SIRFSOC_TIMER_COUNTER_LO 0x0000
-#define SIRFSOC_TIMER_MATCH_0 0x0008
-#define SIRFSOC_TIMER_INT_EN 0x0024
-#define SIRFSOC_TIMER_WATCHDOG_EN 0x0028
-#define SIRFSOC_TIMER_LATCH 0x0030
-#define SIRFSOC_TIMER_LATCHED_LO 0x0034
-
-#define SIRFSOC_TIMER_WDT_INDEX 5
-
-#define SIRFSOC_WDT_MIN_TIMEOUT 30 /* 30 secs */
-#define SIRFSOC_WDT_MAX_TIMEOUT (10 * 60) /* 10 mins */
-#define SIRFSOC_WDT_DEFAULT_TIMEOUT 30 /* 30 secs */
-
-static unsigned int 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) ")");
-
-static void __iomem *sirfsoc_wdt_base(struct watchdog_device *wdd)
-{
- return (void __iomem __force *)watchdog_get_drvdata(wdd);
-}
-
-static unsigned int sirfsoc_wdt_gettimeleft(struct watchdog_device *wdd)
-{
- u32 counter, match;
- void __iomem *wdt_base;
- int time_left;
-
- wdt_base = sirfsoc_wdt_base(wdd);
- counter = readl(wdt_base + SIRFSOC_TIMER_COUNTER_LO);
- match = readl(wdt_base +
- SIRFSOC_TIMER_MATCH_0 + (SIRFSOC_TIMER_WDT_INDEX << 2));
-
- time_left = match - counter;
-
- return time_left / CLOCK_FREQ;
-}
-
-static int sirfsoc_wdt_updatetimeout(struct watchdog_device *wdd)
-{
- u32 counter, timeout_ticks;
- void __iomem *wdt_base;
-
- timeout_ticks = wdd->timeout * CLOCK_FREQ;
- wdt_base = sirfsoc_wdt_base(wdd);
-
- /* Enable the latch before reading the LATCH_LO register */
- writel(1, wdt_base + SIRFSOC_TIMER_LATCH);
-
- /* Set the TO value */
- counter = readl(wdt_base + SIRFSOC_TIMER_LATCHED_LO);
-
- counter += timeout_ticks;
-
- writel(counter, wdt_base +
- SIRFSOC_TIMER_MATCH_0 + (SIRFSOC_TIMER_WDT_INDEX << 2));
-
- return 0;
-}
-
-static int sirfsoc_wdt_enable(struct watchdog_device *wdd)
-{
- void __iomem *wdt_base = sirfsoc_wdt_base(wdd);
- sirfsoc_wdt_updatetimeout(wdd);
-
- /*
- * NOTE: If interrupt is not enabled
- * then WD-Reset doesn't get generated at all.
- */
- writel(readl(wdt_base + SIRFSOC_TIMER_INT_EN)
- | (1 << SIRFSOC_TIMER_WDT_INDEX),
- wdt_base + SIRFSOC_TIMER_INT_EN);
- writel(1, wdt_base + SIRFSOC_TIMER_WATCHDOG_EN);
-
- return 0;
-}
-
-static int sirfsoc_wdt_disable(struct watchdog_device *wdd)
-{
- void __iomem *wdt_base = sirfsoc_wdt_base(wdd);
-
- writel(0, wdt_base + SIRFSOC_TIMER_WATCHDOG_EN);
- writel(readl(wdt_base + SIRFSOC_TIMER_INT_EN)
- & (~(1 << SIRFSOC_TIMER_WDT_INDEX)),
- wdt_base + SIRFSOC_TIMER_INT_EN);
-
- return 0;
-}
-
-static int sirfsoc_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
-{
- wdd->timeout = to;
- sirfsoc_wdt_updatetimeout(wdd);
-
- return 0;
-}
-
-#define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE)
-
-static const struct watchdog_info sirfsoc_wdt_ident = {
- .options = OPTIONS,
- .firmware_version = 0,
- .identity = "SiRFSOC Watchdog",
-};
-
-static const struct watchdog_ops sirfsoc_wdt_ops = {
- .owner = THIS_MODULE,
- .start = sirfsoc_wdt_enable,
- .stop = sirfsoc_wdt_disable,
- .get_timeleft = sirfsoc_wdt_gettimeleft,
- .ping = sirfsoc_wdt_updatetimeout,
- .set_timeout = sirfsoc_wdt_settimeout,
-};
-
-static struct watchdog_device sirfsoc_wdd = {
- .info = &sirfsoc_wdt_ident,
- .ops = &sirfsoc_wdt_ops,
- .timeout = SIRFSOC_WDT_DEFAULT_TIMEOUT,
- .min_timeout = SIRFSOC_WDT_MIN_TIMEOUT,
- .max_timeout = SIRFSOC_WDT_MAX_TIMEOUT,
-};
-
-static int sirfsoc_wdt_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- int ret;
- void __iomem *base;
-
- base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(base))
- return PTR_ERR(base);
-
- watchdog_set_drvdata(&sirfsoc_wdd, (__force void *)base);
-
- watchdog_init_timeout(&sirfsoc_wdd, timeout, dev);
- watchdog_set_nowayout(&sirfsoc_wdd, nowayout);
- sirfsoc_wdd.parent = dev;
-
- watchdog_stop_on_reboot(&sirfsoc_wdd);
- watchdog_stop_on_unregister(&sirfsoc_wdd);
- ret = devm_watchdog_register_device(dev, &sirfsoc_wdd);
- if (ret)
- return ret;
-
- platform_set_drvdata(pdev, &sirfsoc_wdd);
-
- return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int sirfsoc_wdt_suspend(struct device *dev)
-{
- return 0;
-}
-
-static int sirfsoc_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-prima2.c, so we need not
- * update WD settings except refreshing timeout.
- */
- sirfsoc_wdt_updatetimeout(wdd);
-
- return 0;
-}
-#endif
-
-static SIMPLE_DEV_PM_OPS(sirfsoc_wdt_pm_ops,
- sirfsoc_wdt_suspend, sirfsoc_wdt_resume);
-
-static const struct of_device_id sirfsoc_wdt_of_match[] = {
- { .compatible = "sirf,prima2-tick"},
- {},
-};
-MODULE_DEVICE_TABLE(of, sirfsoc_wdt_of_match);
-
-static struct platform_driver sirfsoc_wdt_driver = {
- .driver = {
- .name = "sirfsoc-wdt",
- .pm = &sirfsoc_wdt_pm_ops,
- .of_match_table = sirfsoc_wdt_of_match,
- },
- .probe = sirfsoc_wdt_probe,
-};
-module_platform_driver(sirfsoc_wdt_driver);
-
-MODULE_DESCRIPTION("SiRF SoC watchdog driver");
-MODULE_AUTHOR("Xianglong Du <Xianglong.Du@csr.com>");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:sirfsoc-wdt");
projects / platform / kernel / linux-rpi.git / commitdiff