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