/* * intel-mid_wdt: generic Intel MID SCU watchdog driver * * Platforms supported so far: * - Merrifield only * * Copyright (C) 2014 Intel Corporation. All rights reserved. * Contact: David Cohen * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General * Public License as published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #define IPC_WATCHDOG 0xf8 #define MID_WDT_PRETIMEOUT 15 #define MID_WDT_TIMEOUT_MIN (1 + MID_WDT_PRETIMEOUT) #define MID_WDT_TIMEOUT_MAX 170 #define MID_WDT_DEFAULT_TIMEOUT 90 /* SCU watchdog messages */ enum { SCU_WATCHDOG_START = 0, SCU_WATCHDOG_STOP, SCU_WATCHDOG_KEEPALIVE, }; static inline int wdt_command(int sub, u32 *in, int inlen) { return intel_scu_ipc_command(IPC_WATCHDOG, sub, in, inlen, NULL, 0); } static int wdt_start(struct watchdog_device *wd) { struct device *dev = watchdog_get_drvdata(wd); int ret, in_size; int timeout = wd->timeout; struct ipc_wd_start { u32 pretimeout; u32 timeout; } ipc_wd_start = { timeout - MID_WDT_PRETIMEOUT, timeout }; /* * SCU expects the input size for watchdog IPC to * be based on 4 bytes */ in_size = DIV_ROUND_UP(sizeof(ipc_wd_start), 4); ret = wdt_command(SCU_WATCHDOG_START, (u32 *)&ipc_wd_start, in_size); if (ret) dev_crit(dev, "error starting watchdog: %d\n", ret); return ret; } static int wdt_ping(struct watchdog_device *wd) { struct device *dev = watchdog_get_drvdata(wd); int ret; ret = wdt_command(SCU_WATCHDOG_KEEPALIVE, NULL, 0); if (ret) dev_crit(dev, "Error executing keepalive: %d\n", ret); return ret; } static int wdt_stop(struct watchdog_device *wd) { struct device *dev = watchdog_get_drvdata(wd); int ret; ret = wdt_command(SCU_WATCHDOG_STOP, NULL, 0); if (ret) dev_crit(dev, "Error stopping watchdog: %d\n", ret); return ret; } static irqreturn_t mid_wdt_irq(int irq, void *dev_id) { panic("Kernel Watchdog"); /* This code should not be reached */ return IRQ_HANDLED; } static const struct watchdog_info mid_wdt_info = { .identity = "Intel MID SCU watchdog", .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, }; static const struct watchdog_ops mid_wdt_ops = { .owner = THIS_MODULE, .start = wdt_start, .stop = wdt_stop, .ping = wdt_ping, }; static int mid_wdt_probe(struct platform_device *pdev) { struct watchdog_device *wdt_dev; struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data; int ret; if (!pdata) { dev_err(&pdev->dev, "missing platform data\n"); return -EINVAL; } if (pdata->probe) { ret = pdata->probe(pdev); if (ret) return ret; } wdt_dev = devm_kzalloc(&pdev->dev, sizeof(*wdt_dev), GFP_KERNEL); if (!wdt_dev) return -ENOMEM; wdt_dev->info = &mid_wdt_info; wdt_dev->ops = &mid_wdt_ops; wdt_dev->min_timeout = MID_WDT_TIMEOUT_MIN; wdt_dev->max_timeout = MID_WDT_TIMEOUT_MAX; wdt_dev->timeout = MID_WDT_DEFAULT_TIMEOUT; wdt_dev->parent = &pdev->dev; watchdog_set_drvdata(wdt_dev, &pdev->dev); platform_set_drvdata(pdev, wdt_dev); ret = devm_request_irq(&pdev->dev, pdata->irq, mid_wdt_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "watchdog", wdt_dev); if (ret) { dev_err(&pdev->dev, "error requesting warning irq %d\n", pdata->irq); return ret; } /* Make sure the watchdog is not running */ wdt_stop(wdt_dev); ret = watchdog_register_device(wdt_dev); if (ret) { dev_err(&pdev->dev, "error registering watchdog device\n"); return ret; } dev_info(&pdev->dev, "Intel MID watchdog device probed\n"); return 0; } static int mid_wdt_remove(struct platform_device *pdev) { struct watchdog_device *wd = platform_get_drvdata(pdev); watchdog_unregister_device(wd); return 0; } static struct platform_driver mid_wdt_driver = { .probe = mid_wdt_probe, .remove = mid_wdt_remove, .driver = { .name = "intel_mid_wdt", }, }; module_platform_driver(mid_wdt_driver); MODULE_AUTHOR("David Cohen "); MODULE_DESCRIPTION("Watchdog Driver for Intel MID platform"); MODULE_LICENSE("GPL"); dt' onchange='this.form.submit();'>
authorKalle Valo <kvalo@codeaurora.org>2017-01-27 14:19:25 +0200
committerKalle Valo <kvalo@codeaurora.org>2017-01-28 09:15:50 +0200
commit2b1d530cb3157f828fcaadd259613f59db3c6d1c (patch)
treefb5dfe8f2e6956f54377c7275f330cd158ead259 /include/trace/events/regulator.h
parentbd19b5ab1da654de456e102250822ec06311d6ad (diff)
MAINTAINERS: ath9k-devel is closed
ath9k-devel list is now closed, only linux-wireless should be used. Reported-by: Michael Renzmann <mrenzmann@madwifi-project.org> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Diffstat (limited to 'include/trace/events/regulator.h')