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/* mc.c -- Simulation of Memory Controller

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

   Copyright (C) 2008 Embecosm Limited

   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

   This file is part of Or1ksim, the 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 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 General Public License for

   more details.

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

   with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* This program is commented throughout in a fashion suitable for processing

   with Doxygen. */

/* Enable memory controller, via:

  section mc

    enable = 1

    POC = 0x13243545

  end

   Limitations:

    - memory refresh is not simulated

*/

/* Autoconf and/or portability configuration */

#include "config.h"

#include "port.h"

/* System includes */

#include <stdlib.h>

/* Package includes */

#include "arch.h"

#include "abstract.h"

#include "sim-config.h"

#include "toplevel-support.h"

#include "sim-cmd.h"

#include "mc.h"

struct mc_area

{

  struct dev_memarea *mem;

  unsigned int cs;

  int mc;

  struct mc_area *next;

};

struct mc

{

  uint32_t csr;

  uint32_t poc;

  uint32_t ba_mask;

  uint32_t csc[N_CE];

  uint32_t tms[N_CE];

  oraddr_t baseaddr;

  int enabled;

  /* Index of this memory controler amongst all the memory controlers */

  int index;

  /* List of memory devices under this mc's control */

  struct mc_area *mc_areas;

  struct mc *next;

};

static struct mc *mcs = NULL;

/* List used to temporarily hold memory areas registered with the mc, while the

 * mc configureation has not been loaded */

static struct mc_area *mc_areas = NULL;

void

set_csc_tms (int cs, uint32_t csc, uint32_t tms, struct mc *mc)

{

  struct mc_area *cur = mc->mc_areas;

  while (cur)

    {

      if (cur->cs == cs)

        {

          /* FIXME: No peripheral should _ever_ acess a dev_memarea structure

           * directly */

          cur->mem->addr_mask = mc->ba_mask << 22;

          cur->mem->addr_compare =

            ((csc >> MC_CSC_SEL_OFFSET) /* & 0xff */ ) << 22;

          set_mem_valid (cur->mem, (csc >> MC_CSC_EN_OFFSET) & 0x01);

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

            {

              adjust_rw_delay (cur->mem, (tms & 0xff) + ((tms >> 8) & 0x0f),

                               ((tms >> 12) & 0x0f) + ((tms >> 16) & 0x0f) +

                               ((tms >> 20) & 0x3f));

            }

          else if ((csc >> MC_CSC_MEMTYPE_OFFSET)

                   && 0x07 == MC_CSC_MEMTYPE_SDRAM)

            {

              adjust_rw_delay (cur->mem, 3 + ((tms >> 4) & 0x03),

                               3 + ((tms >> 4) & 0x03));

            }

          else if ((csc >> MC_CSC_MEMTYPE_OFFSET)

                   && 0x07 == MC_CSC_MEMTYPE_SSRAM)

            {

              adjust_rw_delay (cur->mem, 2, 2);

            }

          else if ((csc >> MC_CSC_MEMTYPE_OFFSET)

                   && 0x07 == MC_CSC_MEMTYPE_SYNC)

            {

              adjust_rw_delay (cur->mem, 2, 2);

            }

          return;

        }

      cur = cur->next;

    }

}

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

void

mc_write_word (oraddr_t addr, uint32_t value, void *dat)

{

  struct mc *mc = dat;

  int chipsel;

  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], mc);

      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], mc);

          break;

        }

    }

}

/* Read a specific MC register. */

uint32_t

mc_read_word (oraddr_t addr, void *dat)

{

  struct mc *mc = dat;

  uint32_t value = 0;

  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];

        }

      break;

    }

  return value;

}

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

void

mc_reset (void *dat)

{

  struct mc *mc = dat;

  struct mc_area *cur, *prev, *tmp;

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

  memset (mc->csc, 0, sizeof (mc->csc));

  memset (mc->tms, 0, sizeof (mc->tms));

  mc->csr = 0;

  mc->ba_mask = 0;

  /* Set CS0 */

  mc->csc[0] =

    (((mc->poc & 0x0c) >> 2) << MC_CSC_MEMTYPE_OFFSET) | ((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;

    }

  /* Grab control over all the devices we are destined to control */

  cur = mc_areas;

  prev = NULL;

  while (cur)

    {

      if (cur->mc == mc->index)

        {

          if (prev)

            prev->next = cur->next;

          else

            mc_areas = cur->next;

          prev = cur;

          tmp = cur->next;

          cur->next = mc->mc_areas;

          mc->mc_areas = cur;

          cur = tmp;

        }

      else

        {

          prev = cur;

          cur = cur->next;

        }

    }

  for (cur = mc->mc_areas; cur; cur = cur->next)

    set_mem_valid (cur->mem, 0);

  set_csc_tms (0, mc->csc[0], mc->tms[0], mc);

}

/*---------------------------------------------------------------------------*/

/*!Free all allocated memory                                                 */

/*---------------------------------------------------------------------------*/

void

mc_done ()

{

  while (NULL != mc_areas)

    {

      struct mc_area *next = mc_areas->next;

      free (mc_areas);

      mc_areas = next;

    }

}       /* mc_done () */

void

mc_status (void *dat)

{

  struct mc *mc = dat;

  int i;

  PRINTF ("\nMemory Controller at 0x%" PRIxADDR ":\n", mc->baseaddr);

  PRINTF ("POC: 0x%" PRIx32 "\n", mc->poc);

  PRINTF ("BAS: 0x%" PRIx32 "\n", mc->ba_mask);

  PRINTF ("CSR: 0x%" PRIx32 "\n", mc->csr);

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

    {

      PRINTF ("CE %02d -  CSC: 0x%" PRIx32 "  TMS: 0x%" PRIx32 "\n", i,

              mc->csc[i], mc->tms[i]);

    }

}

/*--------------------------------------------[ Peripheral<->MC interface ]---*/

/* Registers some memory to be under the memory controllers control */

void

mc_reg_mem_area (struct dev_memarea *mem, unsigned int cs, int mc)

{

  struct mc_area *new = malloc (sizeof (struct mc_area));

  if (NULL == new)

    {

      fprintf (stderr, "Out-of-memory\n");

      exit (-1);

    }

  new->cs   = cs;

  new->mem  = mem;

  new->mc   = mc;

  new->next = mc_areas;

  mc_areas  = new;

}

/*-----------------------------------------------------[ MC configuration ]---*/

static void

mc_enabled (union param_val val, void *dat)

{

  struct mc *mc = dat;

  mc->enabled = val.int_val;

}

static void

mc_baseaddr (union param_val val, void *dat)

{

  struct mc *mc = dat;

  mc->baseaddr = val.addr_val;

}

/*---------------------------------------------------------------------------*/

/*!Set the power on configuration state

   Only the bottom 4 bits are signficant. Other bits are truncated with a

   warning.

   @param[in] val  The value to use

   @param[in] dat  The config data structure                                 */

/*---------------------------------------------------------------------------*/

static void

mc_poc (union param_val  val,

        void            *dat)

{

  struct mc *mc = dat;

  if (val.int_val > 0xf)

    {

      fprintf (stderr, "Warning: memory controller PoC > 4 bits: truncated\n");

    }

  mc->poc = val.int_val & 0xf;

}       /* mc_poc() */

static void

mc_index (union param_val val, void *dat)

{

  struct mc *mc = dat;

  mc->index = val.int_val;

}

/*---------------------------------------------------------------------------*/

/*!Initialize a new memory controller configuration

   ALL parameters are set explicitly to default values.                      */

/*---------------------------------------------------------------------------*/

static void *

mc_sec_start ()

{

  struct mc *new = malloc (sizeof (struct mc));

  if (!new)

    {

      fprintf (stderr, "Peripheral MC: Run out of memory\n");

      exit (-1);

    }

  new->enabled  = 1;

  new->baseaddr = 0;

  new->poc      = 0;

  new->index    = 0;

  new->mc_areas = NULL;

  return new;

}

static void

mc_sec_end (void *dat)

{

  struct mc *mc = dat;

  struct mem_ops ops;

  if (!mc->enabled)

    {

      free (dat);

      return;

    }

  /* FIXME: Check to see that the index given to this mc is unique */

  mc->next = mcs;

  mcs = mc;

  memset (&ops, 0, sizeof (struct mem_ops));

  ops.readfunc32 = mc_read_word;

  ops.writefunc32 = mc_write_word;

  ops.write_dat32 = dat;

  ops.read_dat32 = dat;

  /* FIXME: Correct delays? */

  ops.delayr = 2;

  ops.delayw = 2;

  reg_mem_area (mc->baseaddr, MC_ADDR_SPACE, 1, &ops);

  reg_sim_reset (mc_reset, dat);

  reg_sim_stat (mc_status, dat);

}

void

reg_mc_sec (void)

{

  struct config_section *sec =

    reg_config_sec ("mc", mc_sec_start, mc_sec_end);

  reg_config_param (sec, "enabled",  PARAMT_INT, mc_enabled);

  reg_config_param (sec, "baseaddr", PARAMT_ADDR, mc_baseaddr);

  reg_config_param (sec, "POC",      PARAMT_INT, mc_poc);

  reg_config_param (sec, "index",    PARAMT_INT, mc_index);

}