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156 lines
3.6 KiB
156 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) 2016 Yang Ling <[email protected]> |
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*/ |
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#include <linux/clk.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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#include <loongson1.h> |
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#define DEFAULT_HEARTBEAT 30 |
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static bool nowayout = WATCHDOG_NOWAYOUT; |
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module_param(nowayout, bool, 0444); |
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static unsigned int heartbeat; |
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module_param(heartbeat, uint, 0444); |
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struct ls1x_wdt_drvdata { |
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void __iomem *base; |
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struct clk *clk; |
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unsigned long clk_rate; |
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struct watchdog_device wdt; |
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}; |
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static int ls1x_wdt_ping(struct watchdog_device *wdt_dev) |
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{ |
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struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev); |
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writel(0x1, drvdata->base + WDT_SET); |
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return 0; |
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} |
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static int ls1x_wdt_set_timeout(struct watchdog_device *wdt_dev, |
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unsigned int timeout) |
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{ |
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struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev); |
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unsigned int max_hw_heartbeat = wdt_dev->max_hw_heartbeat_ms / 1000; |
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unsigned int counts; |
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wdt_dev->timeout = timeout; |
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counts = drvdata->clk_rate * min(timeout, max_hw_heartbeat); |
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writel(counts, drvdata->base + WDT_TIMER); |
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return 0; |
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} |
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static int ls1x_wdt_start(struct watchdog_device *wdt_dev) |
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{ |
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struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev); |
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writel(0x1, drvdata->base + WDT_EN); |
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return 0; |
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} |
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static int ls1x_wdt_stop(struct watchdog_device *wdt_dev) |
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{ |
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struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev); |
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writel(0x0, drvdata->base + WDT_EN); |
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return 0; |
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} |
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static const struct watchdog_info ls1x_wdt_info = { |
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, |
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.identity = "Loongson1 Watchdog", |
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}; |
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static const struct watchdog_ops ls1x_wdt_ops = { |
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.owner = THIS_MODULE, |
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.start = ls1x_wdt_start, |
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.stop = ls1x_wdt_stop, |
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.ping = ls1x_wdt_ping, |
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.set_timeout = ls1x_wdt_set_timeout, |
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}; |
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static void ls1x_clk_disable_unprepare(void *data) |
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{ |
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clk_disable_unprepare(data); |
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} |
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static int ls1x_wdt_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct ls1x_wdt_drvdata *drvdata; |
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struct watchdog_device *ls1x_wdt; |
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unsigned long clk_rate; |
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int err; |
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drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); |
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if (!drvdata) |
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return -ENOMEM; |
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drvdata->base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(drvdata->base)) |
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return PTR_ERR(drvdata->base); |
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drvdata->clk = devm_clk_get(dev, pdev->name); |
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if (IS_ERR(drvdata->clk)) |
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return PTR_ERR(drvdata->clk); |
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err = clk_prepare_enable(drvdata->clk); |
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if (err) { |
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dev_err(dev, "clk enable failed\n"); |
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return err; |
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} |
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err = devm_add_action_or_reset(dev, ls1x_clk_disable_unprepare, |
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drvdata->clk); |
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if (err) |
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return err; |
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clk_rate = clk_get_rate(drvdata->clk); |
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if (!clk_rate) |
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return -EINVAL; |
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drvdata->clk_rate = clk_rate; |
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ls1x_wdt = &drvdata->wdt; |
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ls1x_wdt->info = &ls1x_wdt_info; |
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ls1x_wdt->ops = &ls1x_wdt_ops; |
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ls1x_wdt->timeout = DEFAULT_HEARTBEAT; |
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ls1x_wdt->min_timeout = 1; |
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ls1x_wdt->max_hw_heartbeat_ms = U32_MAX / clk_rate * 1000; |
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ls1x_wdt->parent = dev; |
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watchdog_init_timeout(ls1x_wdt, heartbeat, dev); |
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watchdog_set_nowayout(ls1x_wdt, nowayout); |
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watchdog_set_drvdata(ls1x_wdt, drvdata); |
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err = devm_watchdog_register_device(dev, &drvdata->wdt); |
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if (err) |
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return err; |
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platform_set_drvdata(pdev, drvdata); |
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dev_info(dev, "Loongson1 Watchdog driver registered\n"); |
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return 0; |
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} |
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static struct platform_driver ls1x_wdt_driver = { |
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.probe = ls1x_wdt_probe, |
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.driver = { |
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.name = "ls1x-wdt", |
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}, |
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}; |
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module_platform_driver(ls1x_wdt_driver); |
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MODULE_AUTHOR("Yang Ling <[email protected]>"); |
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MODULE_DESCRIPTION("Loongson1 Watchdog Driver"); |
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MODULE_LICENSE("GPL");
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