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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,
struct sbi_trap_regs *regs,
struct sbi_ecall_return *out)
{
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 bool srst_available(void)
{
u32 type;
/*
* 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))
return true;
}
return false;
}
struct sbi_ecall_extension ecall_srst;
static int sbi_ecall_srst_register_extensions(void)
{
if (!srst_available())
return 0;
return sbi_ecall_register_extension(&ecall_srst);
}
struct sbi_ecall_extension ecall_srst = {
.name = "srst",
.extid_start = SBI_EXT_SRST,
.extid_end = SBI_EXT_SRST,
.register_extensions = sbi_ecall_srst_register_extensions,
.handle = sbi_ecall_srst_handler,
};
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