The driver uses watchdog timer to do resets and particular watchdog device to use is hardcoded (0)
Signed-off-by: Maxim Sloyko maxims@google.com ---
drivers/sysreset/Makefile | 1 + drivers/sysreset/sysreset_ast.c | 55 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 56 insertions(+) create mode 100644 drivers/sysreset/sysreset_ast.c
diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile index fa75cc52de..37638a8eea 100644 --- a/drivers/sysreset/Makefile +++ b/drivers/sysreset/Makefile @@ -14,3 +14,4 @@ obj-$(CONFIG_ROCKCHIP_RK3399) += sysreset_rk3399.o obj-$(CONFIG_SANDBOX) += sysreset_sandbox.o obj-$(CONFIG_ARCH_SNAPDRAGON) += sysreset_snapdragon.o obj-$(CONFIG_TARGET_XTFPGA) += sysreset_xtfpga.o +obj-$(CONFIG_ARCH_ASPEED) += sysreset_ast.o diff --git a/drivers/sysreset/sysreset_ast.c b/drivers/sysreset/sysreset_ast.c new file mode 100644 index 0000000000..a0ab12851d --- /dev/null +++ b/drivers/sysreset/sysreset_ast.c @@ -0,0 +1,55 @@ +/* + * (C) Copyright 2016 Google, Inc + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <sysreset.h> +#include <asm/io.h> +#include <asm/arch/wdt.h> +#include <linux/err.h> + +/* Number of Watchdog Timer ticks before reset */ +#define AST_WDT_RESET_TIMEOUT 10 +#define AST_WDT_FOR_RESET 0 + +static int ast_sysreset_request(struct udevice *dev, enum sysreset_t type) +{ + struct ast_wdt *wdt = ast_get_wdt(AST_WDT_FOR_RESET); + u32 reset_mode = 0; + + if (IS_ERR(wdt)) + return PTR_ERR(wdt); + + switch (type) { + case SYSRESET_WARM: + reset_mode = WDT_CTRL_RESET_CPU; + break; + case SYSRESET_COLD: + reset_mode = WDT_CTRL_RESET_CHIP; + break; + default: + return -EPROTONOSUPPORT; + } + + /* Clear reset mode bits */ + clrsetbits_le32(&wdt->ctrl, + (WDT_CTRL_RESET_MODE_MASK << WDT_CTRL_RESET_MODE_SHIFT), + (reset_mode << WDT_CTRL_RESET_MODE_SHIFT)); + wdt_start(wdt, AST_WDT_RESET_TIMEOUT); + + return -EINPROGRESS; +} + +static struct sysreset_ops ast_sysreset = { + .request = ast_sysreset_request, +}; + +U_BOOT_DRIVER(sysreset_ast) = { + .name = "ast_sysreset", + .id = UCLASS_SYSRESET, + .ops = &ast_sysreset, +};