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1e3966394a
AM335X based beaglebone black target gets reset by DM converted watchdog
if booted from emmc around 60sec. Fixed this by moving driver's private struct
variable initialization at different places in the driver to driver's probe.
Tested on Beaglebone Black.
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Fixes: 7659ea32 ("watchdog: omap_wdt: Convert watchdog driver to use DT and DM")
Reported-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Suniel Mahesh <sunil.m@techveda.org>
Acked-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
257 lines
6.4 KiB
C
257 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* omap_wdt.c
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*
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* (C) Copyright 2013
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* Heiko Schocher, DENX Software Engineering, hs@denx.de.
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*
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* Based on:
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*
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* Watchdog driver for the TI OMAP 16xx & 24xx/34xx 32KHz (non-secure) watchdog
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*
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* commit 2d991a164a61858012651e13c59521975504e260
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* Author: Bill Pemberton <wfp5p@virginia.edu>
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* Date: Mon Nov 19 13:21:41 2012 -0500
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*
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* watchdog: remove use of __devinit
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*
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* CONFIG_HOTPLUG is going away as an option so __devinit is no longer
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* needed.
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*
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* Author: MontaVista Software, Inc.
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* <gdavis@mvista.com> or <source@mvista.com>
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*
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* History:
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*
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* 20030527: George G. Davis <gdavis@mvista.com>
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* Initially based on linux-2.4.19-rmk7-pxa1/drivers/char/sa1100_wdt.c
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* (c) Copyright 2000 Oleg Drokin <green@crimea.edu>
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* Based on SoftDog driver by Alan Cox <alan@lxorguk.ukuu.org.uk>
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*
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* Copyright (c) 2004 Texas Instruments.
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* 1. Modified to support OMAP1610 32-KHz watchdog timer
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* 2. Ported to 2.6 kernel
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*
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* Copyright (c) 2005 David Brownell
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* Use the driver model and standard identifiers; handle bigger timeouts.
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <asm/arch/hardware.h>
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#include <asm/io.h>
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#include <asm/processor.h>
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#include <asm/arch/cpu.h>
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#include <wdt.h>
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#include <dm.h>
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#include <errno.h>
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/* Hardware timeout in seconds */
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#define WDT_HW_TIMEOUT 60
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#if !CONFIG_IS_ENABLED(WDT)
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static unsigned int wdt_trgr_pattern = 0x1234;
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void hw_watchdog_reset(void)
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{
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struct wd_timer *wdt = (struct wd_timer *)WDT_BASE;
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/*
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* Somebody just triggered watchdog reset and write to WTGR register
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* is in progress. It is resetting right now, no need to trigger it
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* again
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*/
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if ((readl(&wdt->wdtwwps)) & WDT_WWPS_PEND_WTGR)
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return;
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wdt_trgr_pattern = ~wdt_trgr_pattern;
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writel(wdt_trgr_pattern, &wdt->wdtwtgr);
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/*
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* Don't wait for posted write to complete, i.e. don't check
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* WDT_WWPS_PEND_WTGR bit in WWPS register. There is no writes to
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* WTGR register outside of this func, and if entering it
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* we see WDT_WWPS_PEND_WTGR bit set, it means watchdog reset
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* was just triggered. This prevents us from wasting time in busy
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* polling of WDT_WWPS_PEND_WTGR bit.
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*/
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}
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static int omap_wdt_set_timeout(unsigned int timeout)
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{
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struct wd_timer *wdt = (struct wd_timer *)WDT_BASE;
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u32 pre_margin = GET_WLDR_VAL(timeout);
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/* just count up at 32 KHz */
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while (readl(&wdt->wdtwwps) & WDT_WWPS_PEND_WLDR)
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;
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writel(pre_margin, &wdt->wdtwldr);
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while (readl(&wdt->wdtwwps) & WDT_WWPS_PEND_WLDR)
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;
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return 0;
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}
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void hw_watchdog_disable(void)
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{
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struct wd_timer *wdt = (struct wd_timer *)WDT_BASE;
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/*
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* Disable watchdog
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*/
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writel(0xAAAA, &wdt->wdtwspr);
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while (readl(&wdt->wdtwwps) != 0x0)
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;
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writel(0x5555, &wdt->wdtwspr);
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while (readl(&wdt->wdtwwps) != 0x0)
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;
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}
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void hw_watchdog_init(void)
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{
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struct wd_timer *wdt = (struct wd_timer *)WDT_BASE;
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/*
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* Make sure the watchdog is disabled. This is unfortunately required
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* because writing to various registers with the watchdog running has no
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* effect.
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*/
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hw_watchdog_disable();
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/* initialize prescaler */
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while (readl(&wdt->wdtwwps) & WDT_WWPS_PEND_WCLR)
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;
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writel(WDT_WCLR_PRE | (PTV << WDT_WCLR_PTV_OFF), &wdt->wdtwclr);
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while (readl(&wdt->wdtwwps) & WDT_WWPS_PEND_WCLR)
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;
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omap_wdt_set_timeout(WDT_HW_TIMEOUT);
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/* Sequence to enable the watchdog */
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writel(0xBBBB, &wdt->wdtwspr);
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while ((readl(&wdt->wdtwwps)) & WDT_WWPS_PEND_WSPR)
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;
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writel(0x4444, &wdt->wdtwspr);
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while ((readl(&wdt->wdtwwps)) & WDT_WWPS_PEND_WSPR)
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;
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}
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void watchdog_reset(void)
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{
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hw_watchdog_reset();
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}
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#else
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static int omap3_wdt_reset(struct udevice *dev)
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{
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struct omap3_wdt_priv *priv = dev_get_priv(dev);
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/*
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* Somebody just triggered watchdog reset and write to WTGR register
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* is in progress. It is resetting right now, no need to trigger it
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* again
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*/
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if ((readl(&priv->regs->wdtwwps)) & WDT_WWPS_PEND_WTGR)
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return 0;
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priv->wdt_trgr_pattern = ~(priv->wdt_trgr_pattern);
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writel(priv->wdt_trgr_pattern, &priv->regs->wdtwtgr);
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/*
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* Don't wait for posted write to complete, i.e. don't check
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* WDT_WWPS_PEND_WTGR bit in WWPS register. There is no writes to
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* WTGR register outside of this func, and if entering it
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* we see WDT_WWPS_PEND_WTGR bit set, it means watchdog reset
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* was just triggered. This prevents us from wasting time in busy
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* polling of WDT_WWPS_PEND_WTGR bit.
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*/
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return 0;
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}
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static int omap3_wdt_stop(struct udevice *dev)
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{
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struct omap3_wdt_priv *priv = dev_get_priv(dev);
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/* disable watchdog */
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writel(0xAAAA, &priv->regs->wdtwspr);
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while (readl(&priv->regs->wdtwwps) != 0x0)
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;
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writel(0x5555, &priv->regs->wdtwspr);
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while (readl(&priv->regs->wdtwwps) != 0x0)
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;
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return 0;
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}
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static int omap3_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
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{
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struct omap3_wdt_priv *priv = dev_get_priv(dev);
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u32 pre_margin = GET_WLDR_VAL(timeout_ms);
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/*
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* Make sure the watchdog is disabled. This is unfortunately required
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* because writing to various registers with the watchdog running has no
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* effect.
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*/
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omap3_wdt_stop(dev);
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/* initialize prescaler */
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while (readl(&priv->regs->wdtwwps) & WDT_WWPS_PEND_WCLR)
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;
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writel(WDT_WCLR_PRE | (PTV << WDT_WCLR_PTV_OFF), &priv->regs->wdtwclr);
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while (readl(&priv->regs->wdtwwps) & WDT_WWPS_PEND_WCLR)
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;
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/* just count up at 32 KHz */
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while (readl(&priv->regs->wdtwwps) & WDT_WWPS_PEND_WLDR)
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;
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writel(pre_margin, &priv->regs->wdtwldr);
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while (readl(&priv->regs->wdtwwps) & WDT_WWPS_PEND_WLDR)
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;
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/* Sequence to enable the watchdog */
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writel(0xBBBB, &priv->regs->wdtwspr);
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while ((readl(&priv->regs->wdtwwps)) & WDT_WWPS_PEND_WSPR)
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;
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writel(0x4444, &priv->regs->wdtwspr);
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while ((readl(&priv->regs->wdtwwps)) & WDT_WWPS_PEND_WSPR)
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;
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return 0;
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}
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static int omap3_wdt_probe(struct udevice *dev)
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{
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struct omap3_wdt_priv *priv = dev_get_priv(dev);
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priv->regs = (struct wd_timer *)devfdt_get_addr(dev);
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if (!priv->regs)
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return -EINVAL;
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priv->wdt_trgr_pattern = 0x1234;
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debug("%s: Probing wdt%u\n", __func__, dev->seq);
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return 0;
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}
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static const struct wdt_ops omap3_wdt_ops = {
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.start = omap3_wdt_start,
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.stop = omap3_wdt_stop,
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.reset = omap3_wdt_reset,
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};
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static const struct udevice_id omap3_wdt_ids[] = {
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{ .compatible = "ti,omap3-wdt" },
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{ }
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};
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U_BOOT_DRIVER(omap3_wdt) = {
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.name = "omap3_wdt",
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.id = UCLASS_WDT,
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.of_match = omap3_wdt_ids,
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.ops = &omap3_wdt_ops,
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.probe = omap3_wdt_probe,
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.priv_auto_alloc_size = sizeof(struct omap3_wdt_priv),
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};
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#endif /* !CONFIG_IS_ENABLED(WDT) */
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