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// ----------------------------------------------------------------------------
 
// SystemC JTAG driver header
 
// Copyright (C) 2008  Embecosm Limited <info@embecosm.com>
 
// Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
 
// This file is part of the cycle accurate model of the OpenRISC 1000 based
// system-on-chip, ORPSoC, built using Verilator.
 
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
 
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
// License for more details.
 
// You should have received a copy of the GNU Lesser General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
// ----------------------------------------------------------------------------
 
// $Id: JtagDriverSC.h 317 2009-02-22 19:52:12Z jeremy $
 
#ifndef JTAG_DRIVER_SC__H
#define JTAG_DRIVER_SC__H
 
#include <stdint.h>
 
#include "systemc"
 
#include "jtagsc.h"
 
 
//! Module providing TAP requests to JTAG
 
//! Provides a queue of requests to the JTAG interface. Requests are at the
//! level of TAP actions for reset, DR-Scan or IR-Scan.
 
class JtagDriverSC
  : public sc_core::sc_module
{
public:
 
  // Constructor
  JtagDriverSC (sc_core::sc_module_name        name,
		sc_core::sc_fifo<TapAction *> *_tapActionQueue);
 
private:
 
  // JTAG instructions
  static const uint32_t  CHAIN_SELECT_IR = 0x3;  //!< Chain Select instruction
  static const uint32_t  DEBUG_IR        = 0x8;  //!< Debug instruction
 
  // JTAG register lengths (excluding CRC)
  static const int  JTAG_IR_LEN       =  4;	//!< JTAG instr reg length
  static const int  CHAIN_DR_LEN      =  4;	//!< Length of DR (excl CRC)
  static const int  RISC_DEBUG_DR_LEN = 65;	//!< Length of DR (excl CRC)
  static const int  REGISTER_DR_LEN   = 38;	//!< Length of DR (excl CRC)
  static const int  WISHBONE_DR_LEN   = 65;	//!< Length of DR (excl CRC)
 
  // JTAG register address masks
  static const uint32_t  RISC_DEBUG_ADDR_MASK = 0xffffffff;  //!< Mask for addr
  static const uint32_t  REGISTER_ADDR_MASK   = 0x0000001f;  //!< Mask for addr
  static const uint32_t  WISHBONE_ADDR_MASK   = 0xffffffff;  //!< Mask for addr
 
  // JTAG register R/W bit
  static const uint64_t  RISC_DEBUG_RW = 0x100000000ULL;  //!< R/W bit mask
  static const uint64_t  REGISTER_RW   = 0x000000020ULL;  //!< R/W bit mask
  static const uint64_t  WISHBONE_RW   = 0x100000000ULL;  //!< R/W bit mask
 
  // JTAG register data field offsets
  static const int  RISC_DEBUG_DATA_OFF = 33;	//!< Offset to data field
  static const int  REGISTER_DATA_OFF   =  6;  //!< Offset to data field
  static const int  WISHBONE_DATA_OFF   = 33;  //!< Offset to data field
 
  //! JTAG register data field sizes (all the same)
  static const int  DR_DATA_LEN = 32;
 
  //! CRC length
  static const int  CRC_LEN = 8;
 
  // OpenRISC 1000 scan chains
  static const int  OR1K_SC_UNDEF      = -1;	//!< Undefined OR1K scan chain
  static const int  OR1K_SC_RISC_DEBUG =  1;	//!< for access to SPRs
  static const int  OR1K_SC_REGISTER   =  4;	//!< to stall/reset CPU
  static const int  OR1K_SC_WISHBONE   =  5;	//!< for memory access
 
  //! Register addresses for the REGISTER scan chain
  static const uint8_t  OR1K_RSC_RISCOP = 0x04;	//!< Used to reset/stall CPU
 
  // Bits for the RISCOP register
  static const uint32_t  RISCOP_STALL = 0x00000001;	//!< Stall the CPU
  static const uint32_t  RISCOP_RESET = 0x00000002;	//!< Reset the CPU
 
  //! The JTAG fifo we queue on
  sc_core::sc_fifo<TapAction *> *tapActionQueue;
 
  //! The currently selected scan chain
  int  currentScanChain;
 
  // SystemC thread to queue actions
  void  queueActions ();
 
  // Or1k JTAG actions
  void      reset ();
  void      selectChain (int chain);
  uint32_t  readReg (uint32_t  addr);
  uint32_t  readReg1 (uint32_t   addr,
		      int        bitSizeNoCrc);
  uint32_t  readReg1 (uint64_t  *dRegArray,
		      uint32_t   addr,
		      int        bitSizeNoCrc);
  void      writeReg (uint32_t  addr,
		      uint32_t  data);
  // Utilities to compute CRC-8 the OpenRISC way. Versions for "big" and
  // "small" numbers.
  uint8_t  crc8 (uint64_t  data,
		 int       size);
  uint8_t  crc8 (uint64_t *dataArray,
		 int       size);
 
  // Utilities to insert and extract bit strings from vectors
  void  insertBits (uint64_t  str,
		    int       strLen,
		    uint64_t *array,
		    int       startBit);
  uint64_t extractBits (uint64_t *array,
			int       startBit,
			int       strLen);
 
};	// JtagDriverSC ()
 
#endif	// JTAG_DRIVER_SC__H