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- /*
- * watchdog.c - driver for i.mx on-chip watchdog
- *
- * Licensed under the GPL-2 or later.
- */
- #include <common.h>
- #include <cpu_func.h>
- #include <dm.h>
- #include <hang.h>
- #include <asm/io.h>
- #include <wdt.h>
- #include <watchdog.h>
- #include <asm/arch/imx-regs.h>
- #ifdef CONFIG_FSL_LSCH2
- #include <asm/arch/immap_lsch2.h>
- #endif
- #include <fsl_wdog.h>
- #include <div64.h>
- #define TIMEOUT_MAX 128000
- #define TIMEOUT_MIN 500
- static void imx_watchdog_expire_now(struct watchdog_regs *wdog, bool ext_reset)
- {
- u16 wcr = WCR_WDE;
- if (ext_reset)
- wcr |= WCR_SRS; /* do not assert internal reset */
- else
- wcr |= WCR_WDA; /* do not assert external reset */
- /* Write 3 times to ensure it works, due to IMX6Q errata ERR004346 */
- writew(wcr, &wdog->wcr);
- writew(wcr, &wdog->wcr);
- writew(wcr, &wdog->wcr);
- while (1) {
- /*
- * spin before reset
- */
- }
- }
- #if !defined(CONFIG_IMX_WATCHDOG) || \
- (defined(CONFIG_IMX_WATCHDOG) && !CONFIG_IS_ENABLED(WDT))
- void __attribute__((weak)) reset_cpu(void)
- {
- struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
- imx_watchdog_expire_now(wdog, true);
- }
- #endif
- #if defined(CONFIG_IMX_WATCHDOG)
- static void imx_watchdog_reset(struct watchdog_regs *wdog)
- {
- #ifndef CONFIG_WATCHDOG_RESET_DISABLE
- writew(0x5555, &wdog->wsr);
- writew(0xaaaa, &wdog->wsr);
- #endif /* CONFIG_WATCHDOG_RESET_DISABLE*/
- }
- static void imx_watchdog_init(struct watchdog_regs *wdog, bool ext_reset,
- u64 timeout)
- {
- u16 wcr;
- /*
- * The timer watchdog can be set between
- * 0.5 and 128 Seconds. If not defined
- * in configuration file, sets 128 Seconds
- */
- #ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
- #define CONFIG_WATCHDOG_TIMEOUT_MSECS 128000
- #endif
- timeout = max_t(u64, timeout, TIMEOUT_MIN);
- timeout = min_t(u64, timeout, TIMEOUT_MAX);
- timeout = lldiv(timeout, 500) - 1;
- #ifdef CONFIG_FSL_LSCH2
- wcr = (WCR_WDA | WCR_SRS | WCR_WDE) << 8 | timeout;
- #else
- wcr = WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_SRS |
- WCR_WDA | SET_WCR_WT(timeout);
- if (ext_reset)
- wcr |= WCR_WDT;
- #endif /* CONFIG_FSL_LSCH2*/
- writew(wcr, &wdog->wcr);
- imx_watchdog_reset(wdog);
- }
- #if !CONFIG_IS_ENABLED(WDT)
- void hw_watchdog_reset(void)
- {
- struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
- imx_watchdog_reset(wdog);
- }
- void hw_watchdog_init(void)
- {
- struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
- imx_watchdog_init(wdog, true, CONFIG_WATCHDOG_TIMEOUT_MSECS);
- }
- #else
- struct imx_wdt_priv {
- void __iomem *base;
- bool ext_reset;
- };
- static int imx_wdt_reset(struct udevice *dev)
- {
- struct imx_wdt_priv *priv = dev_get_priv(dev);
- imx_watchdog_reset(priv->base);
- return 0;
- }
- static int imx_wdt_expire_now(struct udevice *dev, ulong flags)
- {
- struct imx_wdt_priv *priv = dev_get_priv(dev);
- imx_watchdog_expire_now(priv->base, priv->ext_reset);
- hang();
- return 0;
- }
- static int imx_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
- {
- struct imx_wdt_priv *priv = dev_get_priv(dev);
- imx_watchdog_init(priv->base, priv->ext_reset, timeout);
- return 0;
- }
- static int imx_wdt_probe(struct udevice *dev)
- {
- struct imx_wdt_priv *priv = dev_get_priv(dev);
- priv->base = dev_read_addr_ptr(dev);
- if (!priv->base)
- return -ENOENT;
- priv->ext_reset = dev_read_bool(dev, "fsl,ext-reset-output");
- return 0;
- }
- static const struct wdt_ops imx_wdt_ops = {
- .start = imx_wdt_start,
- .reset = imx_wdt_reset,
- .expire_now = imx_wdt_expire_now,
- };
- static const struct udevice_id imx_wdt_ids[] = {
- { .compatible = "fsl,imx21-wdt" },
- {}
- };
- U_BOOT_DRIVER(imx_wdt) = {
- .name = "imx_wdt",
- .id = UCLASS_WDT,
- .of_match = imx_wdt_ids,
- .probe = imx_wdt_probe,
- .ops = &imx_wdt_ops,
- .priv_auto = sizeof(struct imx_wdt_priv),
- .flags = DM_FLAG_PRE_RELOC,
- };
- #endif
- #endif
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