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- /*
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * Copyright (c) 2020 Western Digital Corporation or its affiliates.
- *
- * Authors:
- * Anup Patel <anup.patel@wdc.com>
- * Atish Patra <atish.patra@wdc.com>
- */
- #include <sbi/sbi_error.h>
- #include <sbi/sbi_ecall.h>
- #include <sbi/sbi_ecall_interface.h>
- #include <sbi/sbi_trap.h>
- #include <sbi/sbi_system.h>
- static int sbi_ecall_srst_handler(unsigned long extid, unsigned long funcid,
- const struct sbi_trap_regs *regs,
- unsigned long *out_val,
- struct sbi_trap_info *out_trap)
- {
- if (funcid == SBI_EXT_SRST_RESET) {
- if ((((u32)-1U) <= ((u64)regs->a0)) ||
- (((u32)-1U) <= ((u64)regs->a1)))
- return SBI_EINVAL;
- switch (regs->a0) {
- case SBI_SRST_RESET_TYPE_SHUTDOWN:
- case SBI_SRST_RESET_TYPE_COLD_REBOOT:
- case SBI_SRST_RESET_TYPE_WARM_REBOOT:
- break;
- default:
- return SBI_EINVAL;
- }
- switch (regs->a1) {
- case SBI_SRST_RESET_REASON_NONE:
- case SBI_SRST_RESET_REASON_SYSFAIL:
- break;
- default:
- return SBI_EINVAL;
- }
- if (sbi_system_reset_supported(regs->a0, regs->a1))
- sbi_system_reset(regs->a0, regs->a1);
- }
- return SBI_ENOTSUPP;
- }
- static int sbi_ecall_srst_probe(unsigned long extid, unsigned long *out_val)
- {
- u32 type, count = 0;
- /*
- * At least one standard reset types should be supported by
- * the platform for SBI SRST extension to be usable.
- */
- for (type = 0; type <= SBI_SRST_RESET_TYPE_LAST; type++) {
- if (sbi_system_reset_supported(type,
- SBI_SRST_RESET_REASON_NONE))
- count++;
- }
- *out_val = (count) ? 1 : 0;
- return 0;
- }
- struct sbi_ecall_extension ecall_srst = {
- .extid_start = SBI_EXT_SRST,
- .extid_end = SBI_EXT_SRST,
- .handle = sbi_ecall_srst_handler,
- .probe = sbi_ecall_srst_probe,
- };
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