fd8af343a2
Rename the cppc_msr.c to cppc.c in x86 ACPI, that expects to use this file to cover more function implementation for ACPI CPPC beside MSR helpers. Naming as "cppc" is more straightforward as one of the functionalities under ACPI subsystem. Signed-off-by: Huang Rui <ray.huang@amd.com> [ rjw: Subject ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
49 lines
997 B
C
49 lines
997 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* cppc.c: CPPC Interface for x86
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* Copyright (c) 2016, Intel Corporation.
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*/
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#include <acpi/cppc_acpi.h>
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#include <asm/msr.h>
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/* Refer to drivers/acpi/cppc_acpi.c for the description of functions */
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bool cpc_ffh_supported(void)
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{
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return true;
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}
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int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val)
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{
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int err;
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err = rdmsrl_safe_on_cpu(cpunum, reg->address, val);
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if (!err) {
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u64 mask = GENMASK_ULL(reg->bit_offset + reg->bit_width - 1,
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reg->bit_offset);
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*val &= mask;
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*val >>= reg->bit_offset;
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}
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return err;
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}
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int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
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{
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u64 rd_val;
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int err;
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err = rdmsrl_safe_on_cpu(cpunum, reg->address, &rd_val);
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if (!err) {
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u64 mask = GENMASK_ULL(reg->bit_offset + reg->bit_width - 1,
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reg->bit_offset);
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val <<= reg->bit_offset;
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val &= mask;
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rd_val &= ~mask;
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rd_val |= val;
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err = wrmsrl_safe_on_cpu(cpunum, reg->address, rd_val);
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}
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return err;
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}
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