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drivers/watchdog/nic7018_wdt.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Copyright (C) 2016 National Instruments Corp. |
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*/ #include <linux/acpi.h> #include <linux/bitops.h> #include <linux/device.h> #include <linux/io.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/watchdog.h> #define LOCK 0xA5 #define UNLOCK 0x5A #define WDT_CTRL_RESET_EN BIT(7) #define WDT_RELOAD_PORT_EN BIT(7) #define WDT_CTRL 1 #define WDT_RELOAD_CTRL 2 #define WDT_PRESET_PRESCALE 4 #define WDT_REG_LOCK 5 #define WDT_COUNT 6 #define WDT_RELOAD_PORT 7 #define WDT_MIN_TIMEOUT 1 #define WDT_MAX_TIMEOUT 464 #define WDT_DEFAULT_TIMEOUT 80 #define WDT_MAX_COUNTER 15 static unsigned int timeout; module_param(timeout, uint, 0); MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (default=" __MODULE_STRING(WDT_DEFAULT_TIMEOUT) ")"); static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started. (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); struct nic7018_wdt { u16 io_base; u32 period; struct watchdog_device wdd; }; struct nic7018_config { u32 period; u8 divider; }; static const struct nic7018_config nic7018_configs[] = { { 2, 4 }, { 32, 5 }, }; static inline u32 nic7018_timeout(u32 period, u8 counter) { return period * counter - period / 2; } static const struct nic7018_config *nic7018_get_config(u32 timeout, u8 *counter) { const struct nic7018_config *config; u8 count; if (timeout < 30 && timeout != 16) { config = &nic7018_configs[0]; count = timeout / 2 + 1; } else { config = &nic7018_configs[1]; count = DIV_ROUND_UP(timeout + 16, 32); if (count > WDT_MAX_COUNTER) count = WDT_MAX_COUNTER; } *counter = count; return config; } static int nic7018_set_timeout(struct watchdog_device *wdd, unsigned int timeout) { struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd); const struct nic7018_config *config; u8 counter; config = nic7018_get_config(timeout, &counter); outb(counter << 4 | config->divider, wdt->io_base + WDT_PRESET_PRESCALE); wdd->timeout = nic7018_timeout(config->period, counter); wdt->period = config->period; return 0; } static int nic7018_start(struct watchdog_device *wdd) { struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd); u8 control; nic7018_set_timeout(wdd, wdd->timeout); control = inb(wdt->io_base + WDT_RELOAD_CTRL); outb(control | WDT_RELOAD_PORT_EN, wdt->io_base + WDT_RELOAD_CTRL); outb(1, wdt->io_base + WDT_RELOAD_PORT); control = inb(wdt->io_base + WDT_CTRL); outb(control | WDT_CTRL_RESET_EN, wdt->io_base + WDT_CTRL); return 0; } static int nic7018_stop(struct watchdog_device *wdd) { struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd); outb(0, wdt->io_base + WDT_CTRL); outb(0, wdt->io_base + WDT_RELOAD_CTRL); outb(0xF0, wdt->io_base + WDT_PRESET_PRESCALE); return 0; } static int nic7018_ping(struct watchdog_device *wdd) { struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd); outb(1, wdt->io_base + WDT_RELOAD_PORT); return 0; } static unsigned int nic7018_get_timeleft(struct watchdog_device *wdd) { struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd); u8 count; count = inb(wdt->io_base + WDT_COUNT) & 0xF; if (!count) return 0; return nic7018_timeout(wdt->period, count); } static const struct watchdog_info nic7018_wdd_info = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .identity = "NIC7018 Watchdog", }; static const struct watchdog_ops nic7018_wdd_ops = { .owner = THIS_MODULE, .start = nic7018_start, .stop = nic7018_stop, .ping = nic7018_ping, .set_timeout = nic7018_set_timeout, .get_timeleft = nic7018_get_timeleft, }; static int nic7018_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct watchdog_device *wdd; struct nic7018_wdt *wdt; struct resource *io_rc; int ret; wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); if (!wdt) return -ENOMEM; platform_set_drvdata(pdev, wdt); io_rc = platform_get_resource(pdev, IORESOURCE_IO, 0); if (!io_rc) { dev_err(dev, "missing IO resources "); return -EINVAL; } if (!devm_request_region(dev, io_rc->start, resource_size(io_rc), KBUILD_MODNAME)) { dev_err(dev, "failed to get IO region "); return -EBUSY; } wdt->io_base = io_rc->start; wdd = &wdt->wdd; wdd->info = &nic7018_wdd_info; wdd->ops = &nic7018_wdd_ops; wdd->min_timeout = WDT_MIN_TIMEOUT; wdd->max_timeout = WDT_MAX_TIMEOUT; wdd->timeout = WDT_DEFAULT_TIMEOUT; wdd->parent = dev; watchdog_set_drvdata(wdd, wdt); watchdog_set_nowayout(wdd, nowayout); |
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watchdog_init_timeout(wdd, timeout, dev); |
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/* Unlock WDT register */ outb(UNLOCK, wdt->io_base + WDT_REG_LOCK); ret = watchdog_register_device(wdd); if (ret) { outb(LOCK, wdt->io_base + WDT_REG_LOCK); |
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return ret; } dev_dbg(dev, "io_base=0x%04X, timeout=%d, nowayout=%d ", wdt->io_base, timeout, nowayout); return 0; } static int nic7018_remove(struct platform_device *pdev) { struct nic7018_wdt *wdt = platform_get_drvdata(pdev); watchdog_unregister_device(&wdt->wdd); /* Lock WDT register */ outb(LOCK, wdt->io_base + WDT_REG_LOCK); return 0; } static const struct acpi_device_id nic7018_device_ids[] = { {"NIC7018", 0}, {"", 0}, }; MODULE_DEVICE_TABLE(acpi, nic7018_device_ids); static struct platform_driver watchdog_driver = { .probe = nic7018_probe, .remove = nic7018_remove, .driver = { .name = KBUILD_MODNAME, .acpi_match_table = ACPI_PTR(nic7018_device_ids), }, }; module_platform_driver(watchdog_driver); MODULE_DESCRIPTION("National Instruments NIC7018 Watchdog driver"); MODULE_AUTHOR("Hui Chun Ong <hui.chun.ong@ni.com>"); MODULE_LICENSE("GPL"); |