diff options
Diffstat (limited to 'arch/arm/mach-aspeed/ast_wdt.c')
-rw-r--r-- | arch/arm/mach-aspeed/ast_wdt.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/arm/mach-aspeed/ast_wdt.c b/arch/arm/mach-aspeed/ast_wdt.c new file mode 100644 index 0000000000..22481ab7ea --- /dev/null +++ b/arch/arm/mach-aspeed/ast_wdt.c @@ -0,0 +1,59 @@ +/* + * (C) Copyright 2016 Google, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/arch/wdt.h> +#include <linux/err.h> + +void wdt_stop(struct ast_wdt *wdt) +{ + clrbits_le32(&wdt->ctrl, WDT_CTRL_EN); +} + +void wdt_start(struct ast_wdt *wdt, u32 timeout) +{ + writel(timeout, &wdt->counter_reload_val); + writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart); + /* + * Setting CLK1MHZ bit is just for compatibility with ast2400 part. + * On ast2500 watchdog timer clock is fixed at 1MHz and the bit is + * read-only + */ + setbits_le32(&wdt->ctrl, + WDT_CTRL_EN | WDT_CTRL_RESET | WDT_CTRL_CLK1MHZ); +} + +struct ast_wdt *ast_get_wdt(u8 wdt_number) +{ + if (wdt_number > CONFIG_WDT_NUM - 1) + return ERR_PTR(-EINVAL); + + return (struct ast_wdt *)(WDT_BASE + + sizeof(struct ast_wdt) * wdt_number); +} + +int ast_wdt_reset_masked(struct ast_wdt *wdt, u32 mask) +{ +#ifdef CONFIG_ASPEED_AST2500 + if (!mask) + return -EINVAL; + + writel(mask, &wdt->reset_mask); + clrbits_le32(&wdt->ctrl, + WDT_CTRL_RESET_MASK << WDT_CTRL_RESET_MODE_SHIFT); + wdt_start(wdt, 1); + + /* Wait for WDT to reset */ + while (readl(&wdt->ctrl) & WDT_CTRL_EN) + ; + wdt_stop(wdt); + + return 0; +#else + return -EINVAL; +#endif +} |