/* * Watchdog driver for Broadcom BCM2835 * * "bcm2708_wdog" driver written by Luke Diamand that was obtained from * branch "rpi-3.6.y" of git://github.com/raspberrypi/linux.git was used * as a hardware reference for the Broadcom BCM2835 watchdog timer. * * Copyright (C) 2013 Lubomir Rintel * * 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 #define PM_RSTC 0x1c #define PM_RSTS 0x20 #define PM_WDOG 0x24 #define PM_PASSWORD 0x5a000000 #define PM_WDOG_TIME_SET 0x000fffff #define PM_RSTC_WRCFG_CLR 0xffffffcf #define PM_RSTS_HADWRH_SET 0x00000040 #define PM_RSTC_WRCFG_SET 0x00000030 #define PM_RSTC_WRCFG_FULL_RESET 0x00000020 #define PM_RSTC_RESET 0x00000102 /* * The Raspberry Pi firmware uses the RSTS register to know which partiton * to boot from. The partiton value is spread into bits 0, 2, 4, 6, 8, 10. * Partiton 63 is a special partition used by the firmware to indicate halt. */ #define PM_RSTS_RASPBERRYPI_HALT 0x555 #define SECS_TO_WDOG_TICKS(x) ((x) << 16) #define WDOG_TICKS_TO_SECS(x) ((x) >> 16) struct bcm2835_wdt { void __iomem *base; spinlock_t lock; struct notifier_block restart_handler; }; static unsigned int heartbeat; static bool nowayout = WATCHDOG_NOWAYOUT; static bool bcm2835_wdt_is_running(struct bcm2835_wdt *wdt) { uint32_t cur; cur = readl(wdt->base + PM_RSTC); return !!(cur & PM_RSTC_WRCFG_FULL_RESET); } static int bcm2835_wdt_start(struct watchdog_device *wdog) { struct bcm2835_wdt *wdt = watchdog_get_drvdata(wdog); uint32_t cur; unsigned long flags; spin_lock_irqsave(&wdt->lock, flags); writel_relaxed(PM_PASSWORD | (SECS_TO_WDOG_TICKS(wdog->timeout) & PM_WDOG_TIME_SET), wdt->base + PM_WDOG); cur = readl_relaxed(wdt->base + PM_RSTC); writel_relaxed(PM_PASSWORD | (cur & PM_RSTC_WRCFG_CLR) | PM_RSTC_WRCFG_FULL_RESET, wdt->base + PM_RSTC); spin_unlock_irqrestore(&wdt->lock, flags); return 0; } static int bcm2835_wdt_stop(struct watchdog_device *wdog) { struct bcm2835_wdt *wdt = watchdog_get_drvdata(wdog); writel_relaxed(PM_PASSWORD | PM_RSTC_RESET, wdt->base + PM_RSTC); return 0; } static unsigned int bcm2835_wdt_get_timeleft(struct watchdog_device *wdog) { struct bcm2835_wdt *wdt = watchdog_get_drvdata(wdog); uint32_t ret = readl_relaxed(wdt->base + PM_WDOG); return WDOG_TICKS_TO_SECS(ret & PM_WDOG_TIME_SET); } static const struct watchdog_ops bcm2835_wdt_ops = { .owner = THIS_MODULE, .start = bcm2835_wdt_start, .stop = bcm2835_wdt_stop, .get_timeleft = bcm2835_wdt_get_timeleft, }; static const struct watchdog_info bcm2835_wdt_info = { .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, .identity = "Broadcom BCM2835 Watchdog timer", }; static struct watchdog_device bcm2835_wdt_wdd = { .info = &bcm2835_wdt_info, .ops = &bcm2835_wdt_ops, .min_timeout = 1, .max_timeout = WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET), .timeout = WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET), }; static int bcm2835_restart(struct notifier_block *this, unsigned long mode, void *cmd) { struct bcm2835_wdt *wdt = container_of(this, struct bcm2835_wdt, restart_handler); u32 val; /* use a timeout of 10 ticks (~150us) */ writel_relaxed(10 | PM_PASSWORD, wdt->base + PM_WDOG); val = readl_relaxed(wdt->base + PM_RSTC); val &= PM_RSTC_WRCFG_CLR; val |= PM_PASSWORD | PM_RSTC_WRCFG_FULL_RESET; writel_relaxed(val, wdt->base + PM_RSTC); /* No sleeping, possibly atomic. */ mdelay(1); return 0; } /* * We can't really power off, but if we do the normal reset scheme, and * indicate to bootcode.bin not to reboot, then most of the chip will be * powered off. */ static void bcm2835_power_off(void) { struct device_node *np = of_find_compatible_node(NULL, NULL, "brcm,bcm2835-pm-wdt"); struct platform_device *pdev = of_find_device_by_node(np); struct bcm2835_wdt *wdt = platform_get_drvdata(pdev); u32 val; /* * We set the watchdog hard reset bit here to distinguish this reset * from the normal (full) reset. bootcode.bin will not reboot after a * hard reset. */ val = readl_relaxed(wdt->base + PM_RSTS); val |= PM_PASSWORD | PM_RSTS_RASPBERRYPI_HALT; writel_relaxed(val, wdt->base + PM_RSTS); /* Continue with normal reset mechanism */ bcm2835_restart(&wdt->restart_handler, REBOOT_HARD, NULL); } static int bcm2835_wdt_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; struct bcm2835_wdt *wdt; int err; wdt = devm_kzalloc(dev, sizeof(struct bcm2835_wdt), GFP_KERNEL); if (!wdt) return -ENOMEM; platform_set_drvdata(pdev, wdt); spin_lock_init(&wdt->lock); wdt->base = of_iomap(np, 0); if (!wdt->base) { dev_err(dev, "Failed to remap watchdog regs"); return -ENODEV; } watchdog_set_drvdata(&bcm2835_wdt_wdd, wdt); watchdog_init_timeout(&bcm2835_wdt_wdd, heartbeat, dev); watchdog_set_nowayout(&bcm2835_wdt_wdd, nowayout); bcm2835_wdt_wdd.parent = &pdev->dev; if (bcm2835_wdt_is_running(wdt)) { /* * The currently active timeout value (set by the * bootloader) may be different from the module * heartbeat parameter or the value in device * tree. But we just need to set WDOG_HW_RUNNING, * because then the framework will "immediately" ping * the device, updating the timeout. */ set_bit(WDOG_HW_RUNNING, &bcm2835_wdt_wdd.status); } err = watchdog_register_device(&bcm2835_wdt_wdd); if (err) { dev_err(dev, "Failed to register watchdog device"); iounmap(wdt->base); return err; } wdt->restart_handler.notifier_call = bcm2835_restart; wdt->restart_handler.priority = 128; register_restart_handler(&wdt->restart_handler); if (pm_power_off == NULL) pm_power_off = bcm2835_power_off; dev_info(dev, "Broadcom BCM2835 watchdog timer"); return 0; } static int bcm2835_wdt_remove(struct platform_device *pdev) { struct bcm2835_wdt *wdt = platform_get_drvdata(pdev); unregister_restart_handler(&wdt->restart_handler); if (pm_power_off == bcm2835_power_off) pm_power_off = NULL; watchdog_unregister_device(&bcm2835_wdt_wdd); iounmap(wdt->base); return 0; } static void bcm2835_wdt_shutdown(struct platform_device *pdev) { bcm2835_wdt_stop(&bcm2835_wdt_wdd); } static const struct of_device_id bcm2835_wdt_of_match[] = { { .compatible = "brcm,bcm2835-pm-wdt", }, {}, }; MODULE_DEVICE_TABLE(of, bcm2835_wdt_of_match); static struct platform_driver bcm2835_wdt_driver = { .probe = bcm2835_wdt_probe, .remove = bcm2835_wdt_remove, .shutdown = bcm2835_wdt_shutdown, .driver = { .name = "bcm2835-wdt", .of_match_table = bcm2835_wdt_of_match, }, }; module_platform_driver(bcm2835_wdt_driver); module_param(heartbeat, uint, 0); MODULE_PARM_DESC(heartbeat, "Initial watchdog heartbeat in seconds"); module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); MODULE_AUTHOR("Lubomir Rintel "); MODULE_DESCRIPTION("Driver for Broadcom BCM2835 watchdog timer"); MODULE_LICENSE("GPL"); From WANG Cong. 11) ip6_tnl_parse_tlv_enc_lim() potentially reallocates the skb buffer, therefore callers must reload cached header pointers into that skb. Fix from Eric Dumazet. 12) Fix various bugs in legacy IRQ fallback handling in alx driver, from Tobias Regnery. 13) Do not allow lwtunnel drivers to be unloaded while they are referenced by active instances, from Robert Shearman. 14) Fix truncated PHY LED trigger names, from Geert Uytterhoeven. 15) Fix a few regressions from virtio_net XDP support, from John Fastabend and Jakub Kicinski. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (102 commits) ISDN: eicon: silence misleading array-bounds warning net: phy: micrel: add support for KSZ8795 gtp: fix cross netns recv on gtp socket gtp: clear DF bit on GTP packet tx gtp: add genl family modules alias tcp: don't annotate mark on control socket from tcp_v6_send_response() ravb: unmap descriptors when freeing rings virtio_net: reject XDP programs using header adjustment virtio_net: use dev_kfree_skb for small buffer XDP receive r8152: check rx after napi is enabled r8152: re-schedule napi for tx r8152: avoid start_xmit to schedule napi when napi is disabled r8152: avoid start_xmit to call napi_schedule during autosuspend net: dsa: Bring back device detaching in dsa_slave_suspend() net: phy: leds: Fix truncated LED trigger names net: phy: leds: Break dependency of phy.h on phy_led_triggers.h net: phy: leds: Clear phy_num_led_triggers on failure to avoid crash net-next: ethernet: mediatek: change the compatible string Documentation: devicetree: change the mediatek ethernet compatible string bnxt_en: Fix RTNL lock usage on bnxt_get_port_module_status(). ...
Diffstat (limited to 'fs/xfs/libxfs/xfs_inode_buf.h')