/* * Broadcom BCM63xx SoC watchdog driver * * Copyright (C) 2007, Miguel Gaio * Copyright (C) 2008, Florian Fainelli * * 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. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define PFX KBUILD_MODNAME #define WDT_HZ 50000000 /* Fclk */ #define WDT_DEFAULT_TIME 30 /* seconds */ #define WDT_MAX_TIME 256 /* seconds */ static struct { void __iomem *regs; struct timer_list timer; unsigned long inuse; atomic_t ticks; } bcm63xx_wdt_device; static int expect_close; static int wdt_time = WDT_DEFAULT_TIME; 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) ")"); /* HW functions */ static void bcm63xx_wdt_hw_start(void) { bcm_writel(0xfffffffe, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG); bcm_writel(WDT_START_1, bcm63xx_wdt_device.regs + WDT_CTL_REG); bcm_writel(WDT_START_2, bcm63xx_wdt_device.regs + WDT_CTL_REG); } static void bcm63xx_wdt_hw_stop(void) { bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG); bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG); } static void bcm63xx_wdt_isr(void *data) { struct pt_regs *regs = get_irq_regs(); die(PFX " fire", regs); } static void bcm63xx_timer_tick(unsigned long unused) { if (!atomic_dec_and_test(&bcm63xx_wdt_device.ticks)) { bcm63xx_wdt_hw_start(); mod_timer(&bcm63xx_wdt_device.timer, jiffies + HZ); } else pr_crit("watchdog will restart system\n"); } static void bcm63xx_wdt_pet(void) { atomic_set(&bcm63xx_wdt_device.ticks, wdt_time); } static void bcm63xx_wdt_start(void) { bcm63xx_wdt_pet(); bcm63xx_timer_tick(0); } static void bcm63xx_wdt_pause(void) { del_timer_sync(&bcm63xx_wdt_device.timer); bcm63xx_wdt_hw_stop(); } static int bcm63xx_wdt_settimeout(int new_time) { if ((new_time <= 0) || (new_time > WDT_MAX_TIME)) return -EINVAL; wdt_time = new_time; return 0; } static int bcm63xx_wdt_open(struct inode *inode, struct file *file) { if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse)) return -EBUSY; bcm63xx_wdt_start(); return nonseekable_open(inode, file); } static int bcm63xx_wdt_release(struct inode *inode, struct file *file) { if (expect_close == 42) bcm63xx_wdt_pause(); else { pr_crit("Unexpected close, not stopping watchdog!\n"); bcm63xx_wdt_start(); } clear_bit(0, &bcm63xx_wdt_device.inuse); expect_close = 0; return 0; } static ssize_t bcm63xx_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) { if (len) { if (!nowayout) { size_t i; /* In case it was set long ago */ expect_close = 0; for (i = 0; i != len; i++) { char c; if (get_user(c, data + i)) return -EFAULT; if (c == 'V') expect_close = 42; } } bcm63xx_wdt_pet(); } return len; } static struct watchdog_info bcm63xx_wdt_info = { .identity = PFX, .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, }; static long bcm63xx_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; int __user *p = argp; int new_value, retval = -EINVAL; switch (cmd) { case WDIOC_GETSUPPORT: return copy_to_user(argp, &bcm63xx_wdt_info, sizeof(bcm63xx_wdt_info)) ? -EFAULT : 0; case WDIOC_GETSTATUS: case WDIOC_GETBOOTSTATUS: return put_user(0, p); case WDIOC_SETOPTIONS: if (get_user(new_value, p)) return -EFAULT; if (new_value & WDIOS_DISABLECARD) { bcm63xx_wdt_pause(); retval = 0; } if (new_value & WDIOS_ENABLECARD) { bcm63xx_wdt_start(); retval = 0; } return retval; case WDIOC_KEEPALIVE: bcm63xx_wdt_pet(); return 0; case WDIOC_SETTIMEOUT: if (get_user(new_value, p)) return -EFAULT; if (bcm63xx_wdt_settimeout(new_value)) return -EINVAL; bcm63xx_wdt_pet(); case WDIOC_GETTIMEOUT: return put_user(wdt_time, p); default: return -ENOTTY; } } static const struct file_operations bcm63xx_wdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = bcm63xx_wdt_write, .unlocked_ioctl = bcm63xx_wdt_ioctl, .open = bcm63xx_wdt_open, .release = bcm63xx_wdt_release, }; static struct miscdevice bcm63xx_wdt_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &bcm63xx_wdt_fops, }; static int bcm63xx_wdt_probe(struct platform_device *pdev) { int ret; struct resource *r; setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_timer_tick, 0L); r = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!r) { dev_err(&pdev->dev, "failed to get resources\n"); return -ENODEV; } bcm63xx_wdt_device.regs = devm_ioremap_nocache(&pdev->dev, r->start, resource_size(r)); if (!bcm63xx_wdt_device.regs) { dev_err(&pdev->dev, "failed to remap I/O resources\n"); return -ENXIO; } ret = bcm63xx_timer_register(TIMER_WDT_ID, bcm63xx_wdt_isr, NULL); if (ret < 0) { dev_err(&pdev->dev, "failed to register wdt timer isr\n"); return ret; } if (bcm63xx_wdt_settimeout(wdt_time)) { bcm63xx_wdt_settimeout(WDT_DEFAULT_TIME); dev_info(&pdev->dev, ": wdt_time value must be 1 <= wdt_time <= 256, using %d\n", wdt_time); } ret = misc_register(&bcm63xx_wdt_miscdev); if (ret < 0) { dev_err(&pdev->dev, "failed to register watchdog device\n"); goto unregister_timer; } dev_info(&pdev->dev, " started, timer margin: %d sec\n", WDT_DEFAULT_TIME); return 0; unregister_timer: bcm63xx_timer_unregister(TIMER_WDT_ID); return ret; } static int bcm63xx_wdt_remove(struct platform_device *pdev) { if (!nowayout) bcm63xx_wdt_pause(); misc_deregister(&bcm63xx_wdt_miscdev); bcm63xx_timer_unregister(TIMER_WDT_ID); return 0; } static void bcm63xx_wdt_shutdown(struct platform_device *pdev) { bcm63xx_wdt_pause(); } static struct platform_driver bcm63xx_wdt_driver = { .probe = bcm63xx_wdt_probe, .remove = bcm63xx_wdt_remove, .shutdown = bcm63xx_wdt_shutdown, .driver = { .name = "bcm63xx-wdt", } }; module_platform_driver(bcm63xx_wdt_driver); MODULE_AUTHOR("Miguel Gaio "); MODULE_AUTHOR("Florian Fainelli "); MODULE_DESCRIPTION("Driver for the Broadcom BCM63xx SoC watchdog"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:bcm63xx-wdt"); the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/rdma/ib_mad.h')