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126 lines
2.9 KiB
126 lines
2.9 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Watchdog driver for TQMx86 PLD. |
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* |
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* The watchdog supports power of 2 timeouts from 1 to 4096sec. |
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* Once started, it cannot be stopped. |
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* |
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* Based on the vendor code written by Vadim V.Vlasov |
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* <[email protected]> |
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*/ |
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#include <linux/io.h> |
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#include <linux/log2.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/timer.h> |
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#include <linux/watchdog.h> |
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/* default timeout (secs) */ |
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#define WDT_TIMEOUT 32 |
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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. (1<=timeout<=4096, default=" |
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__MODULE_STRING(WDT_TIMEOUT) ")"); |
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struct tqmx86_wdt { |
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struct watchdog_device wdd; |
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void __iomem *io_base; |
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}; |
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#define TQMX86_WDCFG 0x00 /* Watchdog Configuration Register */ |
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#define TQMX86_WDCS 0x01 /* Watchdog Config/Status Register */ |
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static int tqmx86_wdt_start(struct watchdog_device *wdd) |
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{ |
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struct tqmx86_wdt *priv = watchdog_get_drvdata(wdd); |
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iowrite8(0x81, priv->io_base + TQMX86_WDCS); |
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return 0; |
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} |
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static int tqmx86_wdt_set_timeout(struct watchdog_device *wdd, unsigned int t) |
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{ |
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struct tqmx86_wdt *priv = watchdog_get_drvdata(wdd); |
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u8 val; |
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t = roundup_pow_of_two(t); |
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val = ilog2(t) | 0x90; |
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val += 3; /* values 0,1,2 correspond to 0.125,0.25,0.5s timeouts */ |
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iowrite8(val, priv->io_base + TQMX86_WDCFG); |
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wdd->timeout = t; |
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return 0; |
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} |
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static const struct watchdog_info tqmx86_wdt_info = { |
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.options = WDIOF_SETTIMEOUT | |
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WDIOF_KEEPALIVEPING, |
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.identity = "TQMx86 Watchdog", |
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}; |
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static struct watchdog_ops tqmx86_wdt_ops = { |
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.owner = THIS_MODULE, |
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.start = tqmx86_wdt_start, |
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.set_timeout = tqmx86_wdt_set_timeout, |
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}; |
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static int tqmx86_wdt_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct tqmx86_wdt *priv; |
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struct resource *res; |
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int err; |
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
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if (!res) |
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return -ENODEV; |
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priv->io_base = devm_ioport_map(dev, res->start, resource_size(res)); |
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if (!priv->io_base) |
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return -ENOMEM; |
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watchdog_set_drvdata(&priv->wdd, priv); |
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priv->wdd.parent = dev; |
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priv->wdd.info = &tqmx86_wdt_info; |
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priv->wdd.ops = &tqmx86_wdt_ops; |
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priv->wdd.min_timeout = 1; |
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priv->wdd.max_timeout = 4096; |
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priv->wdd.max_hw_heartbeat_ms = 4096*1000; |
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priv->wdd.timeout = WDT_TIMEOUT; |
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watchdog_init_timeout(&priv->wdd, timeout, dev); |
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watchdog_set_nowayout(&priv->wdd, WATCHDOG_NOWAYOUT); |
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tqmx86_wdt_set_timeout(&priv->wdd, priv->wdd.timeout); |
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err = devm_watchdog_register_device(dev, &priv->wdd); |
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if (err) |
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return err; |
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dev_info(dev, "TQMx86 watchdog\n"); |
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return 0; |
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} |
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static struct platform_driver tqmx86_wdt_driver = { |
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.driver = { |
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.name = "tqmx86-wdt", |
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}, |
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.probe = tqmx86_wdt_probe, |
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}; |
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module_platform_driver(tqmx86_wdt_driver); |
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MODULE_AUTHOR("Andrew Lunn <[email protected]>"); |
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MODULE_DESCRIPTION("TQMx86 Watchdog"); |
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MODULE_ALIAS("platform:tqmx86-wdt"); |
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MODULE_LICENSE("GPL");
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