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lib: sbi: Implement SBI CPPC extension

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Implement SBI CPPC extension. This extension is only available when
OpenSBI platform provides a CPPC device to generic library.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Sunil V L
2023-03-29 14:27:26 +05:30
committed by Anup Patel
parent 45ba2b203c
commit 33caae8069
5 changed files with 216 additions and 0 deletions
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63
lib/sbi/sbi_ecall_cppc.c Normal file
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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2023 Ventana Micro Systems Inc.
*
*/
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_trap.h>
#include <sbi/sbi_cppc.h>
static int sbi_ecall_cppc_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 = 0;
uint64_t temp;
switch (funcid) {
case SBI_EXT_CPPC_READ:
ret = sbi_cppc_read(regs->a0, &temp);
*out_val = temp;
break;
case SBI_EXT_CPPC_READ_HI:
#if __riscv_xlen == 32
ret = sbi_cppc_read(regs->a0, &temp);
*out_val = temp >> 32;
#else
*out_val = 0;
#endif
break;
case SBI_EXT_CPPC_WRITE:
ret = sbi_cppc_write(regs->a0, regs->a1);
break;
case SBI_EXT_CPPC_PROBE:
ret = sbi_cppc_probe(regs->a0);
if (ret >= 0) {
*out_val = ret;
ret = 0;
}
break;
default:
ret = SBI_ENOTSUPP;
}
return ret;
}
static int sbi_ecall_cppc_probe(unsigned long extid, unsigned long *out_val)
{
*out_val = sbi_cppc_get_device() ? 1 : 0;
return 0;
}
struct sbi_ecall_extension ecall_cppc = {
.extid_start = SBI_EXT_CPPC,
.extid_end = SBI_EXT_CPPC,
.handle = sbi_ecall_cppc_handler,
.probe = sbi_ecall_cppc_probe,
};