/* * Watchdog driver for Cirrus Logic EP93xx family of devices. * * Copyright (c) 2004 Ray Lehtiniemi * Copyright (c) 2006 Tower Technologies * Based on ep93xx driver, bits from alim7101_wdt.c * * Authors: Ray Lehtiniemi , * Alessandro Zummo * * Copyright (c) 2012 H Hartley Sweeten * Convert to a platform device and use the watchdog framework API * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. * * This watchdog fires after 250msec, which is a too short interval * for us to rely on the user space daemon alone. So we ping the * wdt each ~200msec and eventually stop doing it if the user space * daemon dies. * * TODO: * * - Test last reset from watchdog status * - Add a few missing ioctls */ #include #include #include #include #include #define WDT_VERSION "0.4" /* default timeout (secs) */ #define WDT_TIMEOUT 30 static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"); static unsigned int timeout = WDT_TIMEOUT; module_param(timeout, uint, 0); MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WDT_TIMEOUT) ")"); static void __iomem *mmio_base; static struct timer_list timer; static unsigned long next_heartbeat; #define EP93XX_WATCHDOG 0x00 #define EP93XX_WDSTATUS 0x04 /* reset the wdt every ~200ms - the heartbeat of the device is 0.250 seconds*/ #define WDT_INTERVAL (HZ/5) static void ep93xx_wdt_timer_ping(unsigned long data) { if (time_before(jiffies, next_heartbeat)) writel(0x5555, mmio_base + EP93XX_WATCHDOG); /* Re-set the timer interval */ mod_timer(&timer, jiffies + WDT_INTERVAL); } static int ep93xx_wdt_start(struct watchdog_device *wdd) { next_heartbeat = jiffies + (timeout * HZ); writel(0xaaaa, mmio_base + EP93XX_WATCHDOG); mod_timer(&timer, jiffies + WDT_INTERVAL); return 0; } static int ep93xx_wdt_stop(struct watchdog_device *wdd) { del_timer_sync(&timer); writel(0xaa55, mmio_base + EP93XX_WATCHDOG); return 0; } static int ep93xx_wdt_keepalive(struct watchdog_device *wdd) { /* user land ping */ next_heartbeat = jiffies + (timeout * HZ); return 0; } static const struct watchdog_info ep93xx_wdt_ident = { .options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, .identity = "EP93xx Watchdog", }; static struct watchdog_ops ep93xx_wdt_ops = { .owner = THIS_MODULE, .start = ep93xx_wdt_start, .stop = ep93xx_wdt_stop, .ping = ep93xx_wdt_keepalive, }; static struct watchdog_device ep93xx_wdt_wdd = { .info = &ep93xx_wdt_ident, .ops = &ep93xx_wdt_ops, }; static int ep93xx_wdt_probe(struct platform_device *pdev) { struct resource *res; unsigned long val; int err; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); mmio_base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(mmio_base)) return PTR_ERR(mmio_base); if (timeout < 1 || timeout > 3600) { timeout = WDT_TIMEOUT; dev_warn(&pdev->dev, "timeout value must be 1<=x<=3600, using %d\n", timeout); } val = readl(mmio_base + EP93XX_WATCHDOG); ep93xx_wdt_wdd.bootstatus = (val & 0x01) ? WDIOF_CARDRESET : 0; ep93xx_wdt_wdd.timeout = timeout; ep93xx_wdt_wdd.parent = &pdev->dev; watchdog_set_nowayout(&ep93xx_wdt_wdd, nowayout); setup_timer(&timer, ep93xx_wdt_timer_ping, 1); err = watchdog_register_device(&ep93xx_wdt_wdd); if (err) return err; dev_info(&pdev->dev, "EP93XX watchdog, driver version " WDT_VERSION "%s\n", (val & 0x08) ? " (nCS1 disable detected)" : ""); return 0; } static int ep93xx_wdt_remove(struct platform_device *pdev) { watchdog_unregister_device(&ep93xx_wdt_wdd); return 0; } static struct platform_driver ep93xx_wdt_driver = { .driver = { .name = "ep93xx-wdt", }, .probe = ep93xx_wdt_probe, .remove = ep93xx_wdt_remove, }; module_platform_driver(ep93xx_wdt_driver); MODULE_AUTHOR("Ray Lehtiniemi "); MODULE_AUTHOR("Alessandro Zummo "); MODULE_AUTHOR("H Hartley Sweeten "); MODULE_DESCRIPTION("EP93xx Watchdog"); MODULE_LICENSE("GPL"); MODULE_VERSION(WDT_VERSION); ue='25'>25space:mode:
Diffstat (limited to 'drivers/usb/serial/visor.h')
class='commit-subject'>regulator: axp20x: Fix axp809 ldo_io registration error on cold boot
The maximum supported voltage for ldo_io# is 3.3V, but on cold boot the selector comes up at 0x1f, which maps to 3.8V. This was previously corrected by Allwinner's U-boot, which set all regulators on the PMICs to some pre-configured voltage. With recent progress in U-boot SPL support, this is no longer the case. In any case we should handle this quirk in the kernel driver as well. This invalid setting causes _regulator_get_voltage() to fail with -EINVAL which causes regulator registration to fail when constrains are used: [ 1.054181] vcc-pg: failed to get the current voltage(-22) [ 1.059670] axp20x-regulator axp20x-regulator.0: Failed to register ldo_io0 [ 1.069749] axp20x-regulator: probe of axp20x-regulator.0 failed with error -22 This commits makes the axp20x regulator driver accept the 0x1f register value, fixing this. The datasheet does not guarantee reliable operation above 3.3V, so on boards where this regulator is used the regulator-max-microvolt setting must be 3.3V or less. This is essentially the same as the commit f40d4896bf32 ("regulator: axp20x: Fix axp22x ldo_io registration error on cold boot") for AXP22x PMICs. Fixes: a51f9f4622a3 ("regulator: axp20x: support AXP809 variant") Signed-off-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include')