/*
 * Copyright (c) 2011 Aeroflex Gaisler
 *
 * BSD license:
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */


#include <asm-leon/leon.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/*#define DEBUG_CONFIG*/

/* Structure containing address to devices found on the Amba Plug&Play bus */
amba_confarea_type amba_conf;

/* Pointers to Interrupt Controller configuration registers */
volatile LEON3_IrqCtrl_Regs_Map *LEON3_IrqCtrl_Regs = 0;
volatile LEON3_GpTimer_Regs_Map *LEON3_GpTimer_Regs = 0;
unsigned long LEON3_GpTimer_Irq = 0;

unsigned long
amba_find_apbslv_addr (unsigned long vendor, unsigned long device,
		       unsigned long *irq)
{
  unsigned int i, conf, iobar;
  for (i = 0; i < amba_conf.apbslv.devnr; i++)
    {
      conf = amba_get_confword (amba_conf.apbslv, i, 0);
      if ((amba_vendor (conf) == vendor) && (amba_device (conf) == device))
	{
	  if (irq)
	    {
	      *irq = amba_irq (conf);
	    }
	  iobar = amba_apb_get_membar (amba_conf.apbslv, i);
	  return amba_iobar_start (amba_conf.apbslv.apbmst[i], iobar);
	}
    }
  return 0;
}

#define amba_insert_device(tab, address) do {				\
    if (LEON3_BYPASS_LOAD_PA(address)) {				\
      (tab)->addr[(tab)->devnr] = (address);				\
      (tab)->devnr ++;							\
    }									\
  } while(0)

#define amba_insert_apb_device(tab, address, apbmst, idx) do {		\
    if (*(address)) {							\
      (tab)->addr[(tab)->devnr] = (address);				\
      (tab)->apbmst[(tab)->devnr] = (apbmst);				\
      (tab)->apbmstidx[(tab)->devnr] = (idx);				\
      (tab)->devnr ++;							\
    }									\
  } while(0)

/*
 *  Used to scan system bus. Probes for AHB masters, AHB slaves and 
 *  APB slaves. Addresses to configuration areas of the AHB masters,
 *  AHB slaves, APB slaves and APB master are storeds in 
 *  amba_ahb_masters, amba_ahb_slaves and amba.
 */

int amba_init_done = 0;

void
amba_init (void)
{
  unsigned int *cfg_area;	/* address to configuration area */
  unsigned int mbar, conf, apbmst;
  int i, j, idx = 0;

  if (amba_init_done)
    {
      return;
    }
  amba_init_done = 1;

  memset (&amba_conf, 0, sizeof (amba_conf));
  /*amba_conf.ahbmst.devnr = 0; amba_conf.ahbslv.devnr = 0; amba_conf.apbslv.devnr = 0; */

  cfg_area = (unsigned int *) (LEON3_IO_AREA | LEON3_CONF_AREA);

  for (i = 0; i < LEON3_AHB_MASTERS; i++)
    {
      amba_insert_device (&amba_conf.ahbmst, cfg_area);
      cfg_area += LEON3_AHB_CONF_WORDS;
    }

  cfg_area =
    (unsigned int *) (LEON3_IO_AREA | LEON3_CONF_AREA |
		      LEON3_AHB_SLAVE_CONF_AREA);
  for (i = 0; i < LEON3_AHB_SLAVES; i++)
    {
      amba_insert_device (&amba_conf.ahbslv, cfg_area);
      cfg_area += LEON3_AHB_CONF_WORDS;
    }

  for (i = 0; i < amba_conf.ahbslv.devnr; i++)
    {
      conf = amba_get_confword (amba_conf.ahbslv, i, 0);
      mbar = amba_ahb_get_membar (amba_conf.ahbslv, i, 0);
      if ((amba_vendor (conf) == VENDOR_GAISLER)
	  && (amba_device (conf) == GAISLER_APBMST))
	{
	  int k;
	  /*amba_conf.apbmst = */ apbmst = amba_membar_start (mbar);
	  cfg_area = (unsigned int *) (apbmst | LEON3_CONF_AREA);

	  for (j = amba_conf.apbslv.devnr, k = 0;
	       j < AMBA_MAXAPB_DEVS && k < AMBA_MAXAPB_DEVS_PERBUS; j++, k++)
	    {
	      amba_insert_apb_device (&amba_conf.apbslv, cfg_area, apbmst,
				      idx);
	      cfg_area += LEON3_APB_CONF_WORDS;
	    }
	  idx++;
	}
    }

  /* Find LEON3 Interrupt controler */
  LEON3_IrqCtrl_Regs = (volatile LEON3_IrqCtrl_Regs_Map *)
    amba_find_apbslv_addr (VENDOR_GAISLER, GAISLER_IRQMP, 0);
  LEON3_GpTimer_Regs = (volatile LEON3_GpTimer_Regs_Map *)
    amba_find_apbslv_addr (VENDOR_GAISLER, GAISLER_GPTIMER,
			   &LEON3_GpTimer_Irq);
  if (LEON3_IrqCtrl_Regs)
    {
      LEON3_BYPASS_STORE_PA (&(LEON3_IrqCtrl_Regs->mask[0]), 0);
    }
}