scmi_protocols.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
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 * modified or unmodified, in source code or in binary form.
 *
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 * 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
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 * this software without specific prior written permission.
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#ifndef __DEV_ARM_CSS_SCMI_PROTOCOLS_H__
#define __DEV_ARM_CSS_SCMI_PROTOCOLS_H__
 
#include <cstdint>
#include <string>
 
#include "base/compiler.hh"
 
namespace gem5
{
 
GEM5_DEPRECATED_NAMESPACE(SCMI, scmi);
namespace scmi
{
 
class Platform;
struct Message;
 
enum StatusCode
{
    SUCCESS = 0,
    NOT_SUPPORTED = -1,
    INVALID_PARAMETERS = -2,
    DENIED = -3,
    NOT_FOUND = -4,
    OUT_OF_RANGE = -5,
    BUSY = -6,
    COMMS_ERROR = -7,
    GENERIC_ERROR = -8,
    HARDWARE_ERROR = -9,
    PROTOCOL_ERROR = -10
};
 
class Protocol
{
  public:
    // All agent-platform communications in the SCMI protocol
    // are using 15 as a maximum string size, considering the
    // 16th byte is used for the NULL terminator
    static const uint32_t MAX_STRING_SIZE = 15;
 
    Protocol(Platform &_platform)
      : platform(_platform)
    {}
 
    virtual ~Protocol() {}
 
    virtual void handleMessage(Message &msg) = 0;
 
    virtual void version(Message &msg) = 0;
 
    virtual void attributes(Message &msg) = 0;
 
    virtual void messageAttributes(Message &msg) = 0;
 
    const std::string name() const;
 
  protected:
    Platform &platform;
};
 
class BaseProtocol : public Protocol
{
    static const uint32_t PROTOCOL_VERSION = 0x10000;
 
  public:
    explicit BaseProtocol(Platform &_platform);
 
    enum class Commands
    {
        VERSION = 0x0,
        ATTRIBUTES = 0x1,
        MESSAGE_ATTRIBUTES = 0x2,
        DISCOVER_VENDOR = 0x3,
        DISCOVER_SUB_VENDOR = 0x4,
        DISCOVER_IMPLEMENTATION_VERSION = 0x5,
        DISCOVER_LIST_PROTOCOLS = 0x6,
        DISCOVER_AGENT = 0x7,
        NOTIFY_ERRORS = 0x8,
        SET_DEVICE_PERMISSIONS = 0x9,
        SET_PROTOCOL_PERMISSIONS = 0xa,
        RESET_AGENT_CONFIGURATION = 0xb
    };
 
    // Commands
    void handleMessage(Message &msg) override;
    void version(Message &msg) override;
    void attributes(Message &msg) override;
    void messageAttributes(Message &msg) override;
    void discoverVendor(Message &msg);
    void discoverSubVendor(Message &msg);
    void discoverImplVersion(Message &msg);
    void discoverListProtocols(Message &msg);
    void discoverAgent(Message &msg);
 
    // Invalid Command
    void invalidCommand(Message &msg);
 
  protected:
    bool implementedProtocol(Commands message_id) const;
 
    const std::string vendor;
    const std::string subvendor;
    const uint32_t implementationVersion;
 
};
 
} // namespace scmi
} // namespace gem5
 
#endif