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/**
* Copyright © 2017 IBM Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <unistd.h>
#include "cfam_access.hpp"
#include "targeting.hpp"
#include <phosphor-logging/elog.hpp>
#include "elog-errors.hpp"
namespace openpower
{
namespace cfam
{
namespace access
{
constexpr auto cfamRegSize = 4;
using namespace openpower::targeting;
using namespace openpower::util;
/**
* Converts the CFAM register address used by the calling
* code (because that's how it is in the spec) to the address
* required by the device driver.
*/
static inline cfam_address_t makeOffset(cfam_address_t address)
{
return (address & 0xFC00) | ((address & 0x03FF) << 2);
}
void writeReg(const std::unique_ptr<Target>& target,
cfam_address_t address,
cfam_data_t data)
{
using namespace phosphor::logging;
int rc = lseek(target->getCFAMFD(), makeOffset(address), SEEK_SET);
if (rc < 0)
{
elog<org::open_power::Proc::CFAM::SeekFailure>(
org::open_power::Proc::CFAM::SeekFailure::ERRNO(errno),
org::open_power::Proc::CFAM::SeekFailure::ADDRESS(address),
org::open_power::Proc::CFAM::SeekFailure::OFFSET(makeOffset(address)),
org::open_power::Proc::CFAM::SeekFailure::PATH(target->getCFAMPath().c_str()));
}
data = target->swapEndian(data);
rc = write(target->getCFAMFD(), &data, cfamRegSize);
if (rc < 0)
{
elog<org::open_power::Proc::CFAM::WriteFailure>(
org::open_power::Proc::CFAM::WriteFailure::CALLOUT_ERRNO(errno),
org::open_power::Proc::CFAM::WriteFailure::CALLOUT_DEVICE_PATH(
target->getCFAMPath().c_str()));
}
}
cfam_data_t readReg(const std::unique_ptr<Target>& target,
cfam_address_t address)
{
using namespace phosphor::logging;
cfam_data_t data = 0;
int rc = lseek(target->getCFAMFD(), makeOffset(address), SEEK_SET);
if (rc < 0)
{
elog<org::open_power::Proc::CFAM::SeekFailure>(
org::open_power::Proc::CFAM::SeekFailure::ERRNO(errno),
org::open_power::Proc::CFAM::SeekFailure::ADDRESS(address),
org::open_power::Proc::CFAM::SeekFailure::OFFSET(makeOffset(address)),
org::open_power::Proc::CFAM::SeekFailure::PATH(target->getCFAMPath().c_str()));
}
rc = read(target->getCFAMFD(), &data, cfamRegSize);
if (rc < 0)
{
elog<org::open_power::Proc::CFAM::ReadFailure>(
org::open_power::Proc::CFAM::WriteFailure::CALLOUT_ERRNO(errno),
org::open_power::Proc::CFAM::WriteFailure::CALLOUT_DEVICE_PATH(
target->getCFAMPath().c_str()));
}
return target->swapEndian(data);
}
void writeRegWithMask(const std::unique_ptr<Target>& target,
cfam_address_t address,
cfam_data_t data,
cfam_mask_t mask)
{
cfam_data_t readData = readReg(target, address);
readData &= ~mask;
readData |= (data & mask);
writeReg(target, address, readData);
}
}
}
}
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