^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (c) 2016 Yang Ling <gnaygnil@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <loongson1.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #define DEFAULT_HEARTBEAT 30
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) module_param(nowayout, bool, 0444);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static unsigned int heartbeat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) module_param(heartbeat, uint, 0444);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) struct ls1x_wdt_drvdata {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) unsigned long clk_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct watchdog_device wdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static int ls1x_wdt_ping(struct watchdog_device *wdt_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) writel(0x1, drvdata->base + WDT_SET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static int ls1x_wdt_set_timeout(struct watchdog_device *wdt_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) unsigned int timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) unsigned int max_hw_heartbeat = wdt_dev->max_hw_heartbeat_ms / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) unsigned int counts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) wdt_dev->timeout = timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) counts = drvdata->clk_rate * min(timeout, max_hw_heartbeat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) writel(counts, drvdata->base + WDT_TIMER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static int ls1x_wdt_start(struct watchdog_device *wdt_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) writel(0x1, drvdata->base + WDT_EN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static int ls1x_wdt_stop(struct watchdog_device *wdt_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) writel(0x0, drvdata->base + WDT_EN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static const struct watchdog_info ls1x_wdt_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) .identity = "Loongson1 Watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static const struct watchdog_ops ls1x_wdt_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) .start = ls1x_wdt_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) .stop = ls1x_wdt_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) .ping = ls1x_wdt_ping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) .set_timeout = ls1x_wdt_set_timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static void ls1x_clk_disable_unprepare(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) clk_disable_unprepare(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) static int ls1x_wdt_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) struct ls1x_wdt_drvdata *drvdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) struct watchdog_device *ls1x_wdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) unsigned long clk_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (!drvdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) drvdata->base = devm_platform_ioremap_resource(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (IS_ERR(drvdata->base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return PTR_ERR(drvdata->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) drvdata->clk = devm_clk_get(dev, pdev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (IS_ERR(drvdata->clk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return PTR_ERR(drvdata->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) err = clk_prepare_enable(drvdata->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) dev_err(dev, "clk enable failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) err = devm_add_action_or_reset(dev, ls1x_clk_disable_unprepare,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) drvdata->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) clk_rate = clk_get_rate(drvdata->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (!clk_rate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) drvdata->clk_rate = clk_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) ls1x_wdt = &drvdata->wdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) ls1x_wdt->info = &ls1x_wdt_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) ls1x_wdt->ops = &ls1x_wdt_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) ls1x_wdt->timeout = DEFAULT_HEARTBEAT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) ls1x_wdt->min_timeout = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) ls1x_wdt->max_hw_heartbeat_ms = U32_MAX / clk_rate * 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) ls1x_wdt->parent = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) watchdog_init_timeout(ls1x_wdt, heartbeat, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) watchdog_set_nowayout(ls1x_wdt, nowayout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) watchdog_set_drvdata(ls1x_wdt, drvdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) err = devm_watchdog_register_device(dev, &drvdata->wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) platform_set_drvdata(pdev, drvdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) dev_info(dev, "Loongson1 Watchdog driver registered\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static struct platform_driver ls1x_wdt_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) .probe = ls1x_wdt_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) .name = "ls1x-wdt",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) module_platform_driver(ls1x_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) MODULE_AUTHOR("Yang Ling <gnaygnil@gmail.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) MODULE_DESCRIPTION("Loongson1 Watchdog Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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