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lib: sbi: Add system suspend skeleton

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Add the SUSP extension probe and ecall support, but for now the
system suspend function is just a stub.

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Andrew Jones
2023-02-27 11:31:02 +01:00
committed by Anup Patel
parent 8a40306371
commit 73623a0aca
7 changed files with 119 additions and 0 deletions
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48
lib/sbi/sbi_ecall_susp.c Normal file
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// SPDX-License-Identifier: BSD-2-Clause
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_trap.h>
#include <sbi/sbi_system.h>
static int sbi_ecall_susp_handler(unsigned long extid, unsigned long funcid,
const struct sbi_trap_regs *regs,
unsigned long *out_val,
struct sbi_trap_info *out_trap)
{
int ret = SBI_ENOTSUPP;
if (funcid == SBI_EXT_SUSP_SUSPEND)
ret = sbi_system_suspend(regs->a0, regs->a1, regs->a2);
if (ret >= 0) {
*out_val = ret;
ret = 0;
}
return ret;
}
static int sbi_ecall_susp_probe(unsigned long extid, unsigned long *out_val)
{
u32 type, count = 0;
/*
* At least one suspend type should be supported by the
* platform for the SBI SUSP extension to be usable.
*/
for (type = 0; type <= SBI_SUSP_SLEEP_TYPE_LAST; type++) {
if (sbi_system_suspend_supported(type))
count++;
}
*out_val = count ? 1 : 0;
return 0;
}
struct sbi_ecall_extension ecall_susp = {
.extid_start = SBI_EXT_SUSP,
.extid_end = SBI_EXT_SUSP,
.handle = sbi_ecall_susp_handler,
.probe = sbi_ecall_susp_probe,
};