p9_procedures.cpp

/**
 * 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 <phosphor-logging/log.hpp>
#include "cfam_access.hpp"
#include "p9_cfam.hpp"
#include "targeting.hpp"

namespace openpower
{
namespace p9
{

using namespace phosphor::logging;
using namespace openpower::cfam::access;
using namespace openpower::cfam::p9;
using namespace openpower::targeting;

void startHost()
{
    Targeting targets;
    const auto& master = *(targets.begin());

    log<level::INFO>("Running P9 procedure startHost",
                     entry("NUM_PROCS=%d", targets.size()));


    //Ensure asynchronous clock mode is set
    writeReg(master, P9_LL_MODE_REG, 0x00000001);

    //Clock mux select override
    for (const auto& t : targets)
    {
        writeRegWithMask(t, P9_ROOT_CTRL8,
                         0x0000000C, 0x0000000C);
    }

    //Enable P9 checkstop to be reported to the BMC

    //Setup FSI2PIB to report checkstop
    writeReg(master, P9_FSI_A_SI1S, 0x20000000);

    //Enable Xstop/ATTN interrupt
    writeReg(master, P9_FSI2PIB_TRUE_MASK, 0x60000000);

    //Arm it
    writeReg(master, P9_FSI2PIB_INTERRUPT, 0xFFFFFFFF);

    //Kick off the SBE to start the boot

    //First ensure ISTEP stepping isn't enabled
    writeReg(master, P9_SCRATCH_REGISTER_8, 0x20000000);

    //Start the SBE
    writeRegWithMask(master, P9_CBS_CS, 0x80000000, 0x80000000);
}


void vcsWorkaround()
{
    Targeting targets;
    const auto& master = *(targets.begin());

    log<level::INFO>("Running P9 procedure vcsWorkaround",
                     entry("NUM_PROCS=%d", targets.size()));

    //Set asynchronous clock mode
    writeReg(master, P9_LL_MODE_REG, 0x00000001);

    for (const auto& t : targets)
    {
        //Unfence PLL controls
        writeRegWithMask(t, P9_ROOT_CTRL0,
                         0x00000000, 0x00010000);

        //Assert Perv chiplet endpoint reset
        writeRegWithMask(t, P9_PERV_CTRL0,
                         0x40000000, 0x40000000);

        //Enable Nest PLL
        writeRegWithMask(t, P9_PERV_CTRL0,
                         0x00000001, 0x00000001);
    }
}

}
}