/* * System monitoring driver for DA9055 PMICs. * * Copyright(c) 2012 Dialog Semiconductor Ltd. * * Author: David Dajun Chen * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */ #include #include #include #include #include #include #include #include #include static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); #define DA9055_DEF_TIMEOUT 4 #define DA9055_TWDMIN 256 struct da9055_wdt_data { struct watchdog_device wdt; struct da9055 *da9055; }; static const struct { u8 reg_val; int user_time; /* In seconds */ } da9055_wdt_maps[] = { { 0, 0 }, { 1, 2 }, { 2, 4 }, { 3, 8 }, { 4, 16 }, { 5, 32 }, { 5, 33 }, /* Actual time 32.768s so included both 32s and 33s */ { 6, 65 }, { 6, 66 }, /* Actual time 65.536s so include both, 65s and 66s */ { 7, 131 }, }; static int da9055_wdt_set_timeout(struct watchdog_device *wdt_dev, unsigned int timeout) { struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev); struct da9055 *da9055 = driver_data->da9055; int ret, i; for (i = 0; i < ARRAY_SIZE(da9055_wdt_maps); i++) if (da9055_wdt_maps[i].user_time == timeout) break; if (i == ARRAY_SIZE(da9055_wdt_maps)) ret = -EINVAL; else ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, DA9055_TWDSCALE_MASK, da9055_wdt_maps[i].reg_val << DA9055_TWDSCALE_SHIFT); if (ret < 0) { dev_err(da9055->dev, "Failed to update timescale bit, %d\n", ret); return ret; } wdt_dev->timeout = timeout; return 0; } static int da9055_wdt_ping(struct watchdog_device *wdt_dev) { struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev); struct da9055 *da9055 = driver_data->da9055; /* * We have a minimum time for watchdog window called TWDMIN. A write * to the watchdog before this elapsed time will cause an error. */ mdelay(DA9055_TWDMIN); /* Reset the watchdog timer */ return da9055_reg_update(da9055, DA9055_REG_CONTROL_E, DA9055_WATCHDOG_MASK, 1); } static int da9055_wdt_start(struct watchdog_device *wdt_dev) { return da9055_wdt_set_timeout(wdt_dev, wdt_dev->timeout); } static int da9055_wdt_stop(struct watchdog_device *wdt_dev) { return da9055_wdt_set_timeout(wdt_dev, 0); } static struct watchdog_info da9055_wdt_info = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, .identity = "DA9055 Watchdog", }; static const struct watchdog_ops da9055_wdt_ops = { .owner = THIS_MODULE, .start = da9055_wdt_start, .stop = da9055_wdt_stop, .ping = da9055_wdt_ping, .set_timeout = da9055_wdt_set_timeout, }; static int da9055_wdt_probe(struct platform_device *pdev) { struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent); struct da9055_wdt_data *driver_data; struct watchdog_device *da9055_wdt; int ret; driver_data = devm_kzalloc(&pdev->dev, sizeof(*driver_data), GFP_KERNEL); if (!driver_data) return -ENOMEM; driver_data->da9055 = da9055; da9055_wdt = &driver_data->wdt; da9055_wdt->timeout = DA9055_DEF_TIMEOUT; da9055_wdt->info = &da9055_wdt_info; da9055_wdt->ops = &da9055_wdt_ops; da9055_wdt->parent = &pdev->dev; watchdog_set_nowayout(da9055_wdt, nowayout); watchdog_set_drvdata(da9055_wdt, driver_data); ret = da9055_wdt_stop(da9055_wdt); if (ret < 0) { dev_err(&pdev->dev, "Failed to stop watchdog, %d\n", ret); goto err; } platform_set_drvdata(pdev, driver_data); ret = watchdog_register_device(&driver_data->wdt); if (ret != 0) dev_err(da9055->dev, "watchdog_register_device() failed: %d\n", ret); err: return ret; } static int da9055_wdt_remove(struct platform_device *pdev) { struct da9055_wdt_data *driver_data = platform_get_drvdata(pdev); watchdog_unregister_device(&driver_data->wdt); return 0; } static struct platform_driver da9055_wdt_driver = { .probe = da9055_wdt_probe, .remove = da9055_wdt_remove, .driver = { .name = "da9055-watchdog", }, }; module_platform_driver(da9055_wdt_driver); MODULE_AUTHOR("David Dajun Chen "); MODULE_DESCRIPTION("DA9055 watchdog"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:da9055-watchdog"); ption value='0' selected='selected'>unified
authorMarc Zyngier <marc.zyngier@arm.com>2017-01-17 16:00:48 +0000
committerThomas Gleixner <tglx@linutronix.de>2017-01-30 15:18:56 +0100
commit08d85f3ea99f1eeafc4e8507936190e86a16ee8c (patch)
tree410bb1acd0cd7dcfaad37ae7b63ff243b7fa4bee /net/mac802154/trace.c
parent566cf877a1fcb6d6dc0126b076aad062054c2637 (diff)
irqdomain: Avoid activating interrupts more than once
Since commit f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early"), we can end-up activating a PCI/MSI twice (once at allocation time, and once at startup time). This is normally of no consequences, except that there is some HW out there that may misbehave if activate is used more than once (the GICv3 ITS, for example, uses the activate callback to issue the MAPVI command, and the architecture spec says that "If there is an existing mapping for the EventID-DeviceID combination, behavior is UNPREDICTABLE"). While this could be worked around in each individual driver, it may make more sense to tackle the issue at the core level. In order to avoid getting in that situation, let's have a per-interrupt flag to remember if we have already activated that interrupt or not. Fixes: f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early") Reported-and-tested-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1484668848-24361-1-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'net/mac802154/trace.c')