50 строки
1002 B
C
50 строки
1002 B
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* cppc_msr.c: MSR Interface for CPPC
|
|
* Copyright (c) 2016, Intel Corporation.
|
|
*/
|
|
|
|
#include <acpi/cppc_acpi.h>
|
|
#include <asm/msr.h>
|
|
|
|
/* Refer to drivers/acpi/cppc_acpi.c for the description of functions */
|
|
|
|
bool cpc_ffh_supported(void)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val)
|
|
{
|
|
int err;
|
|
|
|
err = rdmsrl_safe_on_cpu(cpunum, reg->address, val);
|
|
if (!err) {
|
|
u64 mask = GENMASK_ULL(reg->bit_offset + reg->bit_width - 1,
|
|
reg->bit_offset);
|
|
|
|
*val &= mask;
|
|
*val >>= reg->bit_offset;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
|
|
{
|
|
u64 rd_val;
|
|
int err;
|
|
|
|
err = rdmsrl_safe_on_cpu(cpunum, reg->address, &rd_val);
|
|
if (!err) {
|
|
u64 mask = GENMASK_ULL(reg->bit_offset + reg->bit_width - 1,
|
|
reg->bit_offset);
|
|
|
|
val <<= reg->bit_offset;
|
|
val &= mask;
|
|
rd_val &= ~mask;
|
|
rd_val |= val;
|
|
err = wrmsrl_safe_on_cpu(cpunum, reg->address, rd_val);
|
|
}
|
|
return err;
|
|
}
|