/* * Watchdog driver for Ricoh RN5T618 PMIC * * Copyright (C) 2014 Beniamino Galvani * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include #include #define DRIVER_NAME "rn5t618-wdt" static bool nowayout = WATCHDOG_NOWAYOUT; static unsigned int timeout; module_param(timeout, uint, 0); MODULE_PARM_DESC(timeout, "Initial watchdog timeout in seconds"); module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); struct rn5t618_wdt { struct watchdog_device wdt_dev; struct rn5t618 *rn5t618; }; /* * This array encodes the values of WDOGTIM field for the supported * watchdog expiration times. If the watchdog is not accessed before * the timer expiration, the PMU generates an interrupt and if the CPU * doesn't clear it within one second the system is restarted. */ static const struct { u8 reg_val; unsigned int time; } rn5t618_wdt_map[] = { { 0, 1 }, { 1, 8 }, { 2, 32 }, { 3, 128 }, }; static int rn5t618_wdt_set_timeout(struct watchdog_device *wdt_dev, unsigned int t) { struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev); int ret, i; for (i = 0; i < ARRAY_SIZE(rn5t618_wdt_map); i++) { if (rn5t618_wdt_map[i].time + 1 >= t) break; } if (i == ARRAY_SIZE(rn5t618_wdt_map)) return -EINVAL; ret = regmap_update_bits(wdt->rn5t618->regmap, RN5T618_WATCHDOG, RN5T618_WATCHDOG_WDOGTIM_M, rn5t618_wdt_map[i].reg_val); if (!ret) wdt_dev->timeout = rn5t618_wdt_map[i].time; return ret; } static int rn5t618_wdt_start(struct watchdog_device *wdt_dev) { struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev); int ret; ret = rn5t618_wdt_set_timeout(wdt_dev, wdt_dev->timeout); if (ret) return ret; /* enable repower-on */ ret = regmap_update_bits(wdt->rn5t618->regmap, RN5T618_REPCNT, RN5T618_REPCNT_REPWRON, RN5T618_REPCNT_REPWRON); if (ret) return ret; /* enable watchdog */ ret = regmap_update_bits(wdt->rn5t618->regmap, RN5T618_WATCHDOG, RN5T618_WATCHDOG_WDOGEN, RN5T618_WATCHDOG_WDOGEN); if (ret) return ret; /* enable watchdog interrupt */ return regmap_update_bits(wdt->rn5t618->regmap, RN5T618_PWRIREN, RN5T618_PWRIRQ_IR_WDOG, RN5T618_PWRIRQ_IR_WDOG); } static int rn5t618_wdt_stop(struct watchdog_device *wdt_dev) { struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev); return regmap_update_bits(wdt->rn5t618->regmap, RN5T618_WATCHDOG, RN5T618_WATCHDOG_WDOGEN, 0); } static int rn5t618_wdt_ping(struct watchdog_device *wdt_dev) { struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev); unsigned int val; int ret; /* The counter is restarted after a R/W access to watchdog register */ ret = regmap_read(wdt->rn5t618->regmap, RN5T618_WATCHDOG, &val); if (ret) return ret; ret = regmap_write(wdt->rn5t618->regmap, RN5T618_WATCHDOG, val); if (ret) return ret; /* Clear pending watchdog interrupt */ return regmap_update_bits(wdt->rn5t618->regmap, RN5T618_PWRIRQ, RN5T618_PWRIRQ_IR_WDOG, 0); } static struct watchdog_info rn5t618_wdt_info = { .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, .identity = DRIVER_NAME, }; static const struct watchdog_ops rn5t618_wdt_ops = { .owner = THIS_MODULE, .start = rn5t618_wdt_start, .stop = rn5t618_wdt_stop, .ping = rn5t618_wdt_ping, .set_timeout = rn5t618_wdt_set_timeout, }; static int rn5t618_wdt_probe(struct platform_device *pdev) { struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent); struct rn5t618_wdt *wdt; int min_timeout, max_timeout; wdt = devm_kzalloc(&pdev->dev, sizeof(struct rn5t618_wdt), GFP_KERNEL); if (!wdt) return -ENOMEM; min_timeout = rn5t618_wdt_map[0].time; max_timeout = rn5t618_wdt_map[ARRAY_SIZE(rn5t618_wdt_map) - 1].time; wdt->rn5t618 = rn5t618; wdt->wdt_dev.info = &rn5t618_wdt_info; wdt->wdt_dev.ops = &rn5t618_wdt_ops; wdt->wdt_dev.min_timeout = min_timeout; wdt->wdt_dev.max_timeout = max_timeout; wdt->wdt_dev.timeout = max_timeout; wdt->wdt_dev.parent = &pdev->dev; watchdog_set_drvdata(&wdt->wdt_dev, wdt); watchdog_init_timeout(&wdt->wdt_dev, timeout, &pdev->dev); watchdog_set_nowayout(&wdt->wdt_dev, nowayout); platform_set_drvdata(pdev, wdt); return watchdog_register_device(&wdt->wdt_dev); } static int rn5t618_wdt_remove(struct platform_device *pdev) { struct rn5t618_wdt *wdt = platform_get_drvdata(pdev); watchdog_unregister_device(&wdt->wdt_dev); return 0; } static struct platform_driver rn5t618_wdt_driver = { .probe = rn5t618_wdt_probe, .remove = rn5t618_wdt_remove, .driver = { .name = DRIVER_NAME, }, }; module_platform_driver(rn5t618_wdt_driver); MODULE_AUTHOR("Beniamino Galvani "); MODULE_DESCRIPTION("RN5T618 watchdog driver"); MODULE_LICENSE("GPL v2"); /td>2017-01-30 15:18:56 +0100 commit08d85f3ea99f1eeafc4e8507936190e86a16ee8c (patch) tree410bb1acd0cd7dcfaad37ae7b63ff243b7fa4bee /sound/aoa/soundbus/i2sbus 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 'sound/aoa/soundbus/i2sbus')