forked from Mirrors/opensbi
767b5fc418
No need to do a fully comprehensive count, just find a supported reset or suspend type Signed-off-by: Xiang W <wxjstz@126.com> Signed-off-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Anup Patel <anup@brainfault.org>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
// SPDX-License-Identifier: BSD-2-Clause
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#include <sbi/sbi_ecall.h>
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#include <sbi/sbi_ecall_interface.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_trap.h>
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#include <sbi/sbi_system.h>
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static int sbi_ecall_susp_handler(unsigned long extid, unsigned long funcid,
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const struct sbi_trap_regs *regs,
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unsigned long *out_val,
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struct sbi_trap_info *out_trap)
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{
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int ret = SBI_ENOTSUPP;
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if (funcid == SBI_EXT_SUSP_SUSPEND)
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ret = sbi_system_suspend(regs->a0, regs->a1, regs->a2);
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if (ret >= 0) {
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*out_val = ret;
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ret = 0;
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}
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return ret;
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}
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static int sbi_ecall_susp_probe(unsigned long extid, unsigned long *out_val)
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{
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u32 type;
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/*
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* At least one suspend type should be supported by the
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* platform for the SBI SUSP extension to be usable.
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*/
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for (type = 0; type <= SBI_SUSP_SLEEP_TYPE_LAST; type++) {
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if (sbi_system_suspend_supported(type)) {
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*out_val = 1;
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return 0;
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}
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}
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*out_val = 0;
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return 0;
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}
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struct sbi_ecall_extension ecall_susp;
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static int sbi_ecall_susp_register_extensions(void)
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{
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unsigned long out_val;
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sbi_ecall_susp_probe(SBI_EXT_SUSP, &out_val);
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if (!out_val)
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return 0;
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return sbi_ecall_register_extension(&ecall_susp);
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}
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struct sbi_ecall_extension ecall_susp = {
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.extid_start = SBI_EXT_SUSP,
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.extid_end = SBI_EXT_SUSP,
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.register_extensions = sbi_ecall_susp_register_extensions,
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.probe = sbi_ecall_susp_probe,
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.handle = sbi_ecall_susp_handler,
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};
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