diff options
Diffstat (limited to 'lib/utils')
| -rw-r--r-- | lib/utils/reset/Kconfig | 4 | ||||
| -rw-r--r-- | lib/utils/reset/fdt_reset_atcwdt200.c | 122 | ||||
| -rw-r--r-- | lib/utils/reset/objects.mk | 3 |
3 files changed, 129 insertions, 0 deletions
diff --git a/lib/utils/reset/Kconfig b/lib/utils/reset/Kconfig index 2e83ff63..0e0c2c1d 100644 --- a/lib/utils/reset/Kconfig +++ b/lib/utils/reset/Kconfig @@ -9,6 +9,10 @@ config FDT_RESET if FDT_RESET +config FDT_RESET_ATCWDT200 + bool "Andes WDT FDT reset driver" + default n + config FDT_RESET_GPIO bool "GPIO FDT reset driver" depends on FDT_GPIO diff --git a/lib/utils/reset/fdt_reset_atcwdt200.c b/lib/utils/reset/fdt_reset_atcwdt200.c new file mode 100644 index 00000000..91acc9f7 --- /dev/null +++ b/lib/utils/reset/fdt_reset_atcwdt200.c @@ -0,0 +1,122 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2022 Andes Technology Corporation + * + * Authors: + * Yu Chien Peter Lin <[email protected]> + */ + +#include <libfdt.h> +#include <sbi/riscv_io.h> +#include <sbi/sbi_ecall_interface.h> +#include <sbi/sbi_error.h> +#include <sbi/sbi_hart.h> +#include <sbi/sbi_platform.h> +#include <sbi/sbi_system.h> +#include <sbi_utils/fdt/fdt_helper.h> +#include <sbi_utils/reset/fdt_reset.h> + +#define ATCWDT200_WP_NUM 0x5aa5 +#define WREN_REG 0x18 +#define CTRL_REG 0x10 +#define RST_TIME_OFF 8 +#define RST_TIME_MSK (0x3 << RST_TIME_OFF) +#define RST_CLK_128 (0 << RST_TIME_OFF) +#define RST_CLK_256 (1 << RST_TIME_OFF) +#define RST_CLK_512 (2 << RST_TIME_OFF) +#define RST_CLK_1024 (3 << RST_TIME_OFF) +#define INT_TIME_OFF 4 +#define INT_TIME_MSK (0xf << INT_TIME_OFF) +#define INT_CLK_64 (0 << INT_TIME_OFF) +#define INT_CLK_256 (1 << INT_TIME_OFF) +#define INT_CLK_1024 (2 << INT_TIME_OFF) +#define INT_CLK_2048 (3 << INT_TIME_OFF) +#define INT_CLK_4096 (4 << INT_TIME_OFF) +#define INT_CLK_8192 (5 << INT_TIME_OFF) +#define INT_CLK_16384 (6 << INT_TIME_OFF) +#define INT_CLK_32768 (7 << INT_TIME_OFF) +#define RST_EN (1 << 3) +#define INT_EN (1 << 2) +#define CLK_PCLK (1 << 1) +#define WDT_EN (1 << 0) + +#define FLASH_BASE 0x80000000ULL +#define SMU_RESET_VEC_LO_OFF 0x50 +#define SMU_RESET_VEC_HI_OFF 0x60 +#define SMU_HARTn_RESET_VEC_LO(n) (SMU_RESET_VEC_LO_OFF + (n * 0x4)) +#define SMU_HARTn_RESET_VEC_HI(n) (SMU_RESET_VEC_HI_OFF + (n * 0x4)) + +static volatile char *wdt_addr; +static volatile char *smu_addr; + +static int ae350_system_reset_check(u32 type, u32 reason) +{ + switch (type) { + case SBI_SRST_RESET_TYPE_COLD_REBOOT: + return 1; + case SBI_SRST_RESET_TYPE_SHUTDOWN: + case SBI_SRST_RESET_TYPE_WARM_REBOOT: + default: + return 0; + } +} + +static void ae350_system_reset(u32 type, u32 reason) +{ + const struct sbi_platform *plat = sbi_platform_thishart_ptr(); + + for (int i = 0; i < sbi_platform_hart_count(plat); i++) { + writel(FLASH_BASE, smu_addr + SMU_HARTn_RESET_VEC_LO(i)); + writel(FLASH_BASE >> 32, smu_addr + SMU_HARTn_RESET_VEC_HI(i)); + } + + /* Program WDT control register */ + writew(ATCWDT200_WP_NUM, wdt_addr + WREN_REG); + writel(INT_CLK_32768 | INT_EN | RST_CLK_128 | RST_EN | WDT_EN, + wdt_addr + CTRL_REG); + + sbi_hart_hang(); +} + +static struct sbi_system_reset_device atcwdt200_reset = { + .name = "atcwdt200", + .system_reset_check = ae350_system_reset_check, + .system_reset = ae350_system_reset, +}; + +static int atcwdt200_reset_init(void *fdt, int nodeoff, + const struct fdt_match *match) +{ + uint64_t reg_addr; + int rc; + + rc = fdt_get_node_addr_size(fdt, nodeoff, 0, ®_addr, NULL); + if (rc < 0 || !reg_addr) + return SBI_ENODEV; + + wdt_addr = (volatile char *)(unsigned long)reg_addr; + + /* + * The reset device requires smu to program the reset + * vector for each hart. + */ + if (fdt_parse_compat_addr(fdt, ®_addr, "andestech,atcsmu")) + return SBI_ENODEV; + + smu_addr = (volatile char *)(unsigned long)reg_addr; + + sbi_system_reset_add_device(&atcwdt200_reset); + + return 0; +} + +static const struct fdt_match atcwdt200_reset_match[] = { + { .compatible = "andestech,atcwdt200" }, + {}, +}; + +struct fdt_reset fdt_reset_atcwdt200 = { + .match_table = atcwdt200_reset_match, + .init = atcwdt200_reset_init, +}; diff --git a/lib/utils/reset/objects.mk b/lib/utils/reset/objects.mk index 8a50dd04..c9f851cd 100644 --- a/lib/utils/reset/objects.mk +++ b/lib/utils/reset/objects.mk @@ -10,6 +10,9 @@ libsbiutils-objs-$(CONFIG_FDT_RESET) += reset/fdt_reset.o libsbiutils-objs-$(CONFIG_FDT_RESET) += reset/fdt_reset_drivers.o +carray-fdt_reset_drivers-$(CONFIG_FDT_RESET_ATCWDT200) += fdt_reset_atcwdt200 +libsbiutils-objs-$(CONFIG_FDT_RESET_ATCWDT200) += reset/fdt_reset_atcwdt200.o + carray-fdt_reset_drivers-$(CONFIG_FDT_RESET_GPIO) += fdt_poweroff_gpio carray-fdt_reset_drivers-$(CONFIG_FDT_RESET_GPIO) += fdt_reset_gpio libsbiutils-objs-$(CONFIG_FDT_RESET_GPIO) += reset/fdt_reset_gpio.o |