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/* mc.c -- Simulation of Memory Controller

         Copyright (C) 2001 by Marko Mlinar, markom@opencores.org

         This file is part of OpenRISC 1000 Architectural Simulator.

         This program is free software; you can redistribute it and/or modify

         it under the terms of the GNU General Public License as published by

         the Free Software Foundation; either version 2 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 General Public License for more details.

         You should have received a copy of the GNU General Public License

         along with this program; if not, write to the Free Software

         Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

/* Enable memory controller, via:

  section mc

    enable = 1

    POC = 0x13243545

  end

   Limitations:

    - memory refresh is not simulated

*/

#include "mc.h"

#include "abstract.h"

#include "sim-config.h"

extern struct dev_memarea *dev_list;

static struct mc mc;

void set_csc_tms (int cs, unsigned long csc, unsigned long tms) {

  struct dev_memarea *mem_dev = dev_list;

  while (mem_dev) {

    if (mem_dev->chip_select == cs) {

      mem_dev->addr_mask = mc.ba_mask << 22;

      mem_dev->addr_compare = ((csc >> MC_CSC_SEL_OFFSET) /* & 0xff*/) << 22;

      mem_dev->valid = (csc >> MC_CSC_EN_OFFSET) & 0x01;

      if ((csc >> MC_CSC_MEMTYPE_OFFSET) && 0x07 == MC_CSC_MEMTYPE_ASYNC) {

        mem_dev->delayr = (tms & 0xff) + ((tms >> 8) & 0x0f);

        mem_dev->delayw = ((tms >> 12)  & 0x0f) + ((tms >> 16) & 0x0f) + ((tms >> 20) & 0x3f);

      } else if ((csc >> MC_CSC_MEMTYPE_OFFSET) && 0x07 == MC_CSC_MEMTYPE_SDRAM) {

        mem_dev->delayr = 3 + ((tms >> 4) & 0x03);

        mem_dev->delayw = 3 + ((tms >> 4) & 0x03);

      } else if ((csc >> MC_CSC_MEMTYPE_OFFSET) && 0x07 == MC_CSC_MEMTYPE_SSRAM) {

        mem_dev->delayr = 2;

        mem_dev->delayw = 2;

      } else if ((csc >> MC_CSC_MEMTYPE_OFFSET) && 0x07 == MC_CSC_MEMTYPE_SYNC) {

        mem_dev->delayr = 2;

        mem_dev->delayw = 2;

      }

      return;

    }

    mem_dev = mem_dev->next;

  }

}

/* Set a specific MC register with value. */

void mc_write_word(unsigned long addr, unsigned long value)

{

        int chipsel;

        debug(5, "mc_write_word(%x,%08x)\n", addr, (unsigned)value);

  addr -= config.mc.baseaddr;

        switch (addr) {

          case MC_CSR:

            mc.csr = value;

            break;

          case MC_POC:

            fprintf (stderr, "warning: write to MC's POC register!");

            break;

          case MC_BA_MASK:

            mc.ba_mask = value & MC_BA_MASK_VALID;

      for (chipsel = 0; chipsel < N_CE; chipsel++)

        set_csc_tms (chipsel, mc.csc[chipsel], mc.tms[chipsel]);

            break;

                default:

                  if (addr >= MC_CSC(0) && addr <= MC_TMS(N_CE - 1)) {

                    addr -= MC_CSC(0);

                    if ((addr >> 2) & 1)

                      mc.tms[addr >> 3] = value;

                    else

                      mc.csc[addr >> 3] = value;

                    set_csc_tms (addr >> 3, mc.csc[addr >> 3], mc.tms[addr >> 3]);

                    break;

                  } else

                        debug(1, "write out of range (addr %x)\n", addr + config.mc.baseaddr);

        }

}

/* Read a specific MC register. */

unsigned long mc_read_word(unsigned long addr)

{

        unsigned long value = 0;

        int chipsel;

        debug(5, "mc_read_word(%x)", addr);

  addr -= config.mc.baseaddr;

        switch (addr) {

          case MC_CSR:

            value = mc.csr;

            break;

          case MC_POC:

            value = mc.poc;

            break;

          case MC_BA_MASK:

            value = mc.ba_mask;

            break;

                default:

                  if (addr >= MC_CSC(0) && addr <= MC_TMS(N_CE - 1)) {

                    addr -= MC_CSC(0);

                    if ((addr >> 2) & 1)

                      value = mc.tms[addr >> 3];

                    else

                      value = mc.csc[addr >> 3];

                  } else

                        debug(1, " read out of range (addr %x)\n", addr + config.mc.baseaddr);

            break;

        }

        debug(5, " value(%x)\n", value);

        return value;

}

/* Read POC register and init memory controler regs. */

void mc_reset()

{

  struct dev_memarea *mem_dev = dev_list;

  if (config.mc.enabled) {

        printf("Resetting memory controller.\n");

        memset(&mc, 0, sizeof(struct mc));

    mc.poc = config.mc.POC;

    /* Set CS0 */

    mc.csc[0] = (((config.mc.POC & 0x0c) >> 2) << MC_CSC_MEMTYPE_OFFSET) | ((config.mc.POC & 0x03) << MC_CSC_BW_OFFSET) | 1;

    if ((mc.csc[0] >> MC_CSC_MEMTYPE_OFFSET) && 0x07 == MC_CSC_MEMTYPE_ASYNC) {

      mc.tms[0] = MC_TMS_ASYNC_VALID;

    } else if ((mc.csc[0] >> MC_CSC_MEMTYPE_OFFSET) && 0x07 == MC_CSC_MEMTYPE_SDRAM) {

      mc.tms[0] = MC_TMS_SDRAM_VALID;

    } else if ((mc.csc[0] >> MC_CSC_MEMTYPE_OFFSET) && 0x07 == MC_CSC_MEMTYPE_SSRAM) {

      mc.tms[0] = MC_TMS_SSRAM_VALID;

    } else if ((mc.csc[0] >> MC_CSC_MEMTYPE_OFFSET) && 0x07 == MC_CSC_MEMTYPE_SYNC) {

      mc.tms[0] = MC_TMS_SYNC_VALID;

    }

    while (mem_dev) {

      mem_dev->valid = 0;

      mem_dev = mem_dev->next;

    }

    set_csc_tms (0, mc.csc[0], mc.tms[0]);

        register_memoryarea(config.mc.baseaddr, MC_ADDR_SPACE, 4, 1, mc_read_word, mc_write_word);

  }

}

inline void mc_clock()

{

}

void mc_status()

{

    int i;

    printf( "\nMemory Controller at 0x%08X:\n", config.mc.baseaddr );

    printf( "POC: 0x%08X\n", mc.poc );

    printf( "BAS: 0x%08X\n", mc.ba_mask );

    printf( "CSR: 0x%08X\n", mc.csr );

    for (i=0; i<N_CE; i++) {

        printf( "CE %02d -  CSC: 0x%08X  TMS: 0x%08X\n", i, mc.csc[i], mc.tms[i]);

    }

}