scmi_platform.hh

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/*
 * Copyright (c) 2020 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef __DEV_ARM_CSS_SCMI_PLATFORM_H__
#define __DEV_ARM_CSS_SCMI_PLATFORM_H__
 
#include "base/bitunion.hh"
#include "dev/arm/css/scmi_protocols.hh"
#include "dev/arm/css/scp.hh"
#include "dev/dma_device.hh"
#include "params/ScmiPlatform.hh"
 
namespace gem5
{
 
class Doorbell;
 
namespace scmi
{
 
class Platform;
 
// Maximum number of protocols defined by the SCMI specification
static const uint8_t PROTOCOL_MAX = 6;
 
enum ProtocolID : uint8_t
{
    BASE = 0x10,
    START = 0x11,
    POWER_DOMAIN = START,
    SYSTEM_POWER = 0x12,
    PERFORMANCE_DOMAIN = 0x13,
    CLOCK = 0x14,
    SENSOR = 0x15,
    END = SENSOR
};
 
enum class MessageType
{
    COMMANDS = 0,
    DELAYED_RESPONSES = 2,
    NOTIFICATIONS = 3
};
 
BitUnion32(MessageHeader)
    Bitfield<27,18> token;
    Bitfield<17,10> protocolId;
    Bitfield<9,8> messageType;
    Bitfield<7,0> messageId;
EndBitUnion(MessageHeader)
 
union Payload
{
    struct
    {
        int32_t status;
    } invalidCommand;
 
    struct
    {
        int32_t status;
        uint32_t version;
    } baseProtocolVersion;
 
    struct
    {
        int32_t status;
        uint32_t attributes;
    } baseProtocolAttributes;
 
    struct
    {
        union
        {
            int32_t status;
            uint32_t messageId;
        };
        uint32_t attributes;
    } baseProtocolMessageAttributes;
 
    struct
    {
        int32_t status;
        uint8_t vendorIdentifier[Protocol::MAX_STRING_SIZE + 1];
    } baseDiscoverVendor;
 
    struct
    {
        int32_t status;
        uint8_t vendorIdentifier[Protocol::MAX_STRING_SIZE + 1];
    } baseDiscoverSubVendor;
 
    struct
    {
        int32_t status;
        uint32_t implementationVersion;
    } baseDiscoverImplementationVersion;
 
    struct
    {
        union
        {
            uint32_t skip;
            int32_t status;
        };
        uint32_t numProtocols;
        uint32_t protocols[(PROTOCOL_MAX - 1)/ 4];
    } baseDiscoverListProtocols;
 
    struct
    {
        union
        {
            uint32_t agentId;
            int32_t status;
        };
        uint8_t name[Protocol::MAX_STRING_SIZE + 1];
    } baseDiscoverAgent;
 
    int32_t status;
};
 
struct Message
{
    uint32_t reserved0;
    uint32_t channelStatus;
    uint64_t reserved1;
    uint32_t mailboxFlags;
    uint32_t length;
    uint32_t header;
    Payload payload;
};
 
class VirtualChannel : public SimObject
{
  public:
    VirtualChannel(const ScmiChannelParams &p)
      : SimObject(p),
        msgBuffer(), pendingMessage(false), shmem(p.shmem_range),
        physID(p.phys_id), virtID(p.virt_id),
        doorbell(p.doorbell)
    {}
 
    void
    setPlatform(Platform *_platform)
    {
        platform = _platform;
    }
 
    Message msgBuffer;
    bool pendingMessage;
 
    const AddrRange shmem;
 
    const uint32_t physID;
    const uint32_t virtID;
 
    DmaPort *dmaPort;
    Doorbell *doorbell;
    Platform *platform;
 
  private:
    static const int dmaSize = 8; // 64 bits
};
 
class AgentChannel : public VirtualChannel
{
  public:
    AgentChannel(const ScmiChannelParams &p);
 
    void initiateRead();
 
    void readStatus();
    void readLength();
    void readMessage();
    void handleMessage();
 
    EventFunctionWrapper readLengthEvent;
    EventFunctionWrapper readMessageEvent;
    EventFunctionWrapper handleMessageEvent;
};
 
class PlatformChannel : public VirtualChannel
{
  public:
    PlatformChannel(const ScmiChannelParams &p);
 
    void writeBackMessage(const Message &msg);
    void notifyAgent();
    void clearDoorbell();
    void complete();
 
    EventFunctionWrapper clearDoorbellEvent;
    EventFunctionWrapper notifyAgentEvent;
    EventFunctionWrapper completeEvent;
 
  protected:
    uint32_t agentDoorbellVal;
    uint32_t platformDoorbellVal;
};
 
class Communication : public SimObject
{
  public:
    Communication(const ScmiCommunicationParams &p)
      : SimObject(p), platformChan(p.platform_channel),
        agentChan(p.agent_channel)
    {}
 
    PlatformChannel *platformChan;
    AgentChannel *agentChan;
};
 
class Platform : public Scp
{
  public:
    using ProtocolList = std::unordered_map<uint8_t, Protocol *>;
 
    PARAMS(ScmiPlatform);
    Platform(const Params &p);
    ~Platform();
 
    void handleMessage(AgentChannel *ch, Message &msg);
 
    uint32_t numAgents() const { return agents.size(); }
 
    const char*
    getAgent(unsigned index) const
    {
        return agents[index].c_str();
    }
 
    uint32_t numProtocols() const { return protocols.size() - 1; }
 
    Port& getPort(const std::string &if_name, PortID idx) override;
 
    void raiseInterrupt(const Doorbell *doorbell) override;
    void clearInterrupt(const Doorbell *doorbell) override;
 
    static uint32_t
    protocolID(const Message &msg)
    {
        return bits(msg.header, 17, 10);
    }
 
    static uint32_t
    messageID(const Message &msg)
    {
        return bits(msg.header, 7, 0);
    }
 
    static uint32_t
    messageType(const Message &msg)
    {
        return bits(msg.header, 9, 8);
    }
 
    const ProtocolList&
    protocolList() const
    {
        return protocols;
    }
 
    AgentChannel* find(PlatformChannel* platform) const;
    PlatformChannel* find(AgentChannel* agent) const;
 
  private:
    std::vector<Communication *> comms;
    const std::vector<std::string> agents;
 
    ProtocolList protocols;
 
    DmaPort dmaPort;
};
 
} // namespace scmi
} // namespace gem5
 
#endif // __DEV_ARM_CSS_SCMI_PLATFORM_H__