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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
172 lines
3.5 KiB
C
172 lines
3.5 KiB
C
/*
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* watchdog.c - driver for i.mx on-chip watchdog
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <dm.h>
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#include <hang.h>
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#include <asm/io.h>
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#include <wdt.h>
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#include <watchdog.h>
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#include <asm/arch/imx-regs.h>
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#ifdef CONFIG_FSL_LSCH2
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#include <asm/arch/immap_lsch2.h>
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#endif
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#include <fsl_wdog.h>
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#include <div64.h>
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#define TIMEOUT_MAX 128000
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#define TIMEOUT_MIN 500
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static void imx_watchdog_expire_now(struct watchdog_regs *wdog, bool ext_reset)
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{
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u16 wcr = WCR_WDE;
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if (ext_reset)
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wcr |= WCR_SRS; /* do not assert internal reset */
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else
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wcr |= WCR_WDA; /* do not assert external reset */
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/* Write 3 times to ensure it works, due to IMX6Q errata ERR004346 */
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writew(wcr, &wdog->wcr);
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writew(wcr, &wdog->wcr);
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writew(wcr, &wdog->wcr);
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while (1) {
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/*
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* spin before reset
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*/
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}
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}
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#if !defined(CONFIG_IMX_WATCHDOG) || \
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(defined(CONFIG_IMX_WATCHDOG) && !CONFIG_IS_ENABLED(WDT))
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void __attribute__((weak)) reset_cpu(void)
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{
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struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
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imx_watchdog_expire_now(wdog, true);
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}
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#endif
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#if defined(CONFIG_IMX_WATCHDOG)
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static void imx_watchdog_reset(struct watchdog_regs *wdog)
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{
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#ifndef CONFIG_WATCHDOG_RESET_DISABLE
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writew(0x5555, &wdog->wsr);
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writew(0xaaaa, &wdog->wsr);
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#endif /* CONFIG_WATCHDOG_RESET_DISABLE*/
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}
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static void imx_watchdog_init(struct watchdog_regs *wdog, bool ext_reset,
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u64 timeout)
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{
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u16 wcr;
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/*
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* The timer watchdog can be set between
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* 0.5 and 128 Seconds.
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*/
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timeout = max_t(u64, timeout, TIMEOUT_MIN);
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timeout = min_t(u64, timeout, TIMEOUT_MAX);
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timeout = lldiv(timeout, 500) - 1;
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#ifdef CONFIG_FSL_LSCH2
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wcr = (WCR_WDA | WCR_SRS | WCR_WDE) << 8 | timeout;
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#else
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wcr = WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_SRS |
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WCR_WDA | SET_WCR_WT(timeout);
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if (ext_reset)
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wcr |= WCR_WDT;
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#endif /* CONFIG_FSL_LSCH2*/
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writew(wcr, &wdog->wcr);
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imx_watchdog_reset(wdog);
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}
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#if !CONFIG_IS_ENABLED(WDT)
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void hw_watchdog_reset(void)
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{
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struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
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imx_watchdog_reset(wdog);
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}
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void hw_watchdog_init(void)
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{
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struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
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imx_watchdog_init(wdog, true, CONFIG_WATCHDOG_TIMEOUT_MSECS);
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}
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#else
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struct imx_wdt_priv {
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void __iomem *base;
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bool ext_reset;
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};
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static int imx_wdt_reset(struct udevice *dev)
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{
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struct imx_wdt_priv *priv = dev_get_priv(dev);
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imx_watchdog_reset(priv->base);
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return 0;
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}
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static int imx_wdt_expire_now(struct udevice *dev, ulong flags)
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{
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struct imx_wdt_priv *priv = dev_get_priv(dev);
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imx_watchdog_expire_now(priv->base, priv->ext_reset);
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hang();
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return 0;
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}
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static int imx_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
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{
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struct imx_wdt_priv *priv = dev_get_priv(dev);
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imx_watchdog_init(priv->base, priv->ext_reset, timeout);
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return 0;
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}
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static int imx_wdt_probe(struct udevice *dev)
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{
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struct imx_wdt_priv *priv = dev_get_priv(dev);
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priv->base = dev_read_addr_ptr(dev);
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if (!priv->base)
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return -ENOENT;
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priv->ext_reset = dev_read_bool(dev, "fsl,ext-reset-output");
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return 0;
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}
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static const struct wdt_ops imx_wdt_ops = {
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.start = imx_wdt_start,
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.reset = imx_wdt_reset,
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.expire_now = imx_wdt_expire_now,
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};
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static const struct udevice_id imx_wdt_ids[] = {
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{ .compatible = "fsl,imx21-wdt" },
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{}
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};
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U_BOOT_DRIVER(imx_wdt) = {
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.name = "imx_wdt",
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.id = UCLASS_WDT,
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.of_match = imx_wdt_ids,
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.probe = imx_wdt_probe,
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.ops = &imx_wdt_ops,
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.priv_auto = sizeof(struct imx_wdt_priv),
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.flags = DM_FLAG_PRE_RELOC,
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};
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#endif
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#endif
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