board/fads/fads.c

/*
 * (C) Copyright 2000-2004
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * Modified by, Yuli Barcohen, Arabella Software Ltd., yuli@arabellasw.com
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <config.h>
#include <common.h>
#include <mpc8xx.h>

#define	_NOT_USED_	0xFFFFFFFF

/* ========================================================================= */

#ifndef CONFIG_DUET_ADS /* No old DRAM on Duet */

#if defined(CONFIG_DRAM_50MHZ)
/* 50MHz tables */
static const uint dram_60ns[] =
{ 0x8fffec24, 0x0fffec04, 0x0cffec04, 0x00ffec04,
  0x00ffec00, 0x37ffec47, _NOT_USED_, _NOT_USED_,
  0x8fffec24, 0x0fffec04, 0x08ffec04, 0x00ffec0c,
  0x03ffec00, 0x00ffec44, 0x00ffcc08, 0x0cffcc44,
  0x00ffec0c, 0x03ffec00, 0x00ffec44, 0x00ffcc00,
  0x3fffc847, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x8fafcc24, 0x0fafcc04, 0x0cafcc00, 0x11bfcc47,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x8fafcc24, 0x0fafcc04, 0x0cafcc00, 0x03afcc4c,
  0x0cafcc00, 0x03afcc4c, 0x0cafcc00, 0x03afcc4c,
  0x0cafcc00, 0x33bfcc4f, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0xc0ffcc84, 0x00ffcc04, 0x07ffcc04, 0x3fffcc06,
  0xffffcc85, 0xffffcc05, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x33ffcc07, _NOT_USED_, _NOT_USED_, _NOT_USED_ };

static const uint dram_70ns[] =
{ 0x8fffcc24, 0x0fffcc04, 0x0cffcc04, 0x00ffcc04,
  0x00ffcc00, 0x37ffcc47, _NOT_USED_, _NOT_USED_,
  0x8fffcc24, 0x0fffcc04, 0x0cffcc04, 0x00ffcc04,
  0x00ffcc08, 0x0cffcc44, 0x00ffec0c, 0x03ffec00,
  0x00ffec44, 0x00ffcc08, 0x0cffcc44, 0x00ffec04,
  0x00ffec00, 0x3fffec47, _NOT_USED_, _NOT_USED_,
  0x8fafcc24, 0x0fafcc04, 0x0cafcc00, 0x11bfcc47,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x8fafcc24, 0x0fafcc04, 0x0cafcc00, 0x03afcc4c,
  0x0cafcc00, 0x03afcc4c, 0x0cafcc00, 0x03afcc4c,
  0x0cafcc00, 0x33bfcc4f, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0xe0ffcc84, 0x00ffcc04, 0x00ffcc04, 0x0fffcc04,
  0x7fffcc06, 0xffffcc85, 0xffffcc05, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x33ffcc07, _NOT_USED_, _NOT_USED_, _NOT_USED_ };

static const uint edo_60ns[] =
{ 0x8ffbec24, 0x0ff3ec04, 0x0cf3ec04, 0x00f3ec04,
  0x00f3ec00, 0x37f7ec47, _NOT_USED_, _NOT_USED_,
  0x8fffec24, 0x0ffbec04, 0x0cf3ec04, 0x00f3ec0c,
  0x0cf3ec00, 0x00f3ec4c, 0x0cf3ec00, 0x00f3ec4c,
  0x0cf3ec00, 0x00f3ec44, 0x03f3ec00, 0x3ff7ec47,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x8fffcc24, 0x0fefcc04, 0x0cafcc00, 0x11bfcc47,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x8fffcc24, 0x0fefcc04, 0x0cafcc00, 0x03afcc4c,
  0x0cafcc00, 0x03afcc4c, 0x0cafcc00, 0x03afcc4c,
  0x0cafcc00, 0x33bfcc4f, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0xc0ffcc84, 0x00ffcc04, 0x07ffcc04, 0x3fffcc06,
  0xffffcc85, 0xffffcc05, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x33ffcc07, _NOT_USED_, _NOT_USED_, _NOT_USED_ };

static const uint edo_70ns[] =
{ 0x8ffbcc24, 0x0ff3cc04, 0x0cf3cc04, 0x00f3cc04,
  0x00f3cc00, 0x37f7cc47, _NOT_USED_, _NOT_USED_,
  0x8fffcc24, 0x0ffbcc04, 0x0cf3cc04, 0x00f3cc0c,
  0x03f3cc00, 0x00f3cc44, 0x00f3ec0c, 0x0cf3ec00,
  0x00f3ec4c, 0x03f3ec00, 0x00f3ec44, 0x00f3cc00,
  0x33f7cc47, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x8fffcc24, 0x0fefcc04, 0x0cafcc00, 0x11bfcc47,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x8fffcc24, 0x0fefcc04, 0x0cafcc00, 0x03afcc4c,
  0x0cafcc00, 0x03afcc4c, 0x0cafcc00, 0x03afcc4c,
  0x0cafcc00, 0x33bfcc47, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0xe0ffcc84, 0x00ffcc04, 0x00ffcc04, 0x0fffcc04,
  0x7fffcc04, 0xffffcc86, 0xffffcc05, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x33ffcc07, _NOT_USED_, _NOT_USED_, _NOT_USED_ };

#elif defined(CONFIG_DRAM_25MHZ)

/* 25MHz tables */

static const uint dram_60ns[] =
{ 0x0fffcc04, 0x08ffcc00, 0x33ffcc47, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x0fffcc24, 0x0fffcc04, 0x08ffcc00, 0x03ffcc4c,
  0x08ffcc00, 0x03ffcc4c, 0x08ffcc00, 0x03ffcc4c,
  0x08ffcc00, 0x33ffcc47, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x0fafcc04, 0x08afcc00, 0x3fbfcc47, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x0fafcc04, 0x0cafcc00, 0x01afcc4c, 0x0cafcc00,
  0x01afcc4c, 0x0cafcc00, 0x01afcc4c, 0x0cafcc00,
  0x31bfcc43, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x80ffcc84, 0x13ffcc04, 0xffffcc87, 0xffffcc05,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x33ffcc07, _NOT_USED_, _NOT_USED_, _NOT_USED_ };

static const uint dram_70ns[] =
{ 0x0fffec04, 0x08ffec04, 0x00ffec00, 0x3fffcc47,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x0fffcc24, 0x0fffcc04, 0x08ffcc00, 0x03ffcc4c,
  0x08ffcc00, 0x03ffcc4c, 0x08ffcc00, 0x03ffcc4c,
  0x08ffcc00, 0x33ffcc47, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x0fafcc04, 0x08afcc00, 0x3fbfcc47, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x0fafcc04, 0x0cafcc00, 0x01afcc4c, 0x0cafcc00,
  0x01afcc4c, 0x0cafcc00, 0x01afcc4c, 0x0cafcc00,
  0x31bfcc43, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0xc0ffcc84, 0x01ffcc04, 0x7fffcc86, 0xffffcc05,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x33ffcc07, _NOT_USED_, _NOT_USED_, _NOT_USED_ };

static const uint edo_60ns[] =
{ 0x0ffbcc04, 0x0cf3cc04, 0x00f3cc00, 0x33f7cc47,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x0ffbcc04, 0x09f3cc0c, 0x09f3cc0c, 0x09f3cc0c,
  0x08f3cc00, 0x3ff7cc47, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x0fefcc04, 0x08afcc04, 0x00afcc00, 0x3fbfcc47,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x0fefcc04, 0x08afcc00, 0x07afcc48, 0x08afcc48,
  0x08afcc48, 0x39bfcc47, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x80ffcc84, 0x13ffcc04, 0xffffcc87, 0xffffcc05,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x33ffcc07, _NOT_USED_, _NOT_USED_, _NOT_USED_ };

static const uint edo_70ns[] =
{ 0x0ffbcc04, 0x0cf3cc04, 0x00f3cc00, 0x33f7cc47,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x0ffbec04, 0x08f3ec04, 0x03f3ec48, 0x08f3cc00,
  0x0ff3cc4c, 0x08f3cc00, 0x0ff3cc4c, 0x08f3cc00,
  0x3ff7cc47, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x0fefcc04, 0x08afcc04, 0x00afcc00, 0x3fbfcc47,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x0fefcc04, 0x08afcc00, 0x07afcc4c, 0x08afcc00,
  0x07afcc4c, 0x08afcc00, 0x07afcc4c, 0x08afcc00,
  0x37bfcc47, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0xc0ffcc84, 0x01ffcc04, 0x7fffcc86, 0xffffcc05,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  0x33ffcc07, _NOT_USED_, _NOT_USED_, _NOT_USED_ };
#else
#error dram not correctly defined - use CONFIG_DRAM_25MHZ or CONFIG_DRAM_50MHZ
#endif

/* ------------------------------------------------------------------------- */
static int _draminit (uint base, uint noMbytes, uint edo, uint delay)
{
	volatile immap_t *immap = (immap_t *) CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;

	/* init upm */

	switch (delay) {
	case 70:
		if (edo) {
			upmconfig (UPMA, (uint *) edo_70ns,
				   sizeof (edo_70ns) / sizeof (uint));
		} else {
			upmconfig (UPMA, (uint *) dram_70ns,
				   sizeof (dram_70ns) / sizeof (uint));
		}

		break;

	case 60:
		if (edo) {
			upmconfig (UPMA, (uint *) edo_60ns,
				   sizeof (edo_60ns) / sizeof (uint));
		} else {
			upmconfig (UPMA, (uint *) dram_60ns,
				   sizeof (dram_60ns) / sizeof (uint));
		}

		break;

	default:
		return -1;
	}

	memctl->memc_mptpr = 0x0400;	/* divide by 16 */

	switch (noMbytes) {
	case 4:				/* 4 Mbyte uses only CS2 */
#ifdef CONFIG_ADS
		memctl->memc_mamr = 0xc0a21114;
#else
		memctl->memc_mamr = 0x13a01114;	/* PTA 0x13 AMA 010 */
#endif
		memctl->memc_or2 = 0xffc00800;	/* 4M */
		break;

	case 8:				/* 8 Mbyte uses both CS3 and CS2 */
		memctl->memc_mamr = 0x13a01114;	/* PTA 0x13 AMA 010 */
		memctl->memc_or3 = 0xffc00800;	/* 4M */
		memctl->memc_br3 = 0x00400081 + base;
		memctl->memc_or2 = 0xffc00800;	/* 4M */
		break;

	case 16:			/* 16 Mbyte uses only CS2 */
#ifdef CONFIG_ADS	/* XXX: why PTA=0x60 only in 16M case? - NTL */
		memctl->memc_mamr = 0x60b21114;	/* PTA 0x60 AMA 011 */
#else
		memctl->memc_mamr = 0x13b01114;	/* PTA 0x13 AMA 011 */
#endif
		memctl->memc_or2 = 0xff000800;	/* 16M */
		break;

	case 32:			/* 32 Mbyte uses both CS3 and CS2 */
		memctl->memc_mamr = 0x13b01114;	/* PTA 0x13 AMA 011 */
		memctl->memc_or3 = 0xff000800;	/* 16M */
		memctl->memc_br3 = 0x01000081 + base;
		memctl->memc_or2 = 0xff000800;	/* 16M */
		break;

	default:
		return -1;
	}

	memctl->memc_br2 = 0x81 + base;	/* use upma */

	*((uint *) BCSR1) &= ~BCSR1_DRAM_EN;	/* enable dram */

	/* if no dimm is inserted, noMbytes is still detected as 8m, so
	 * sanity check top and bottom of memory */

	/* check bytes / 2 because get_ram_size tests at base+bytes, which
	 * is not mapped */
	if (noMbytes == 8)
		if (get_ram_size ((long *) base, noMbytes << 19) != noMbytes << 19) {
			*((uint *) BCSR1) |= BCSR1_DRAM_EN;	/* disable dram */
			return -1;
		}

	return 0;
}

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

static void _dramdisable(void)
{
	volatile immap_t     *immap = (immap_t *)CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;

	memctl->memc_br2 = 0x00000000;
	memctl->memc_br3 = 0x00000000;

	/* maybe we should turn off upma here or something */
}
#endif /* !CONFIG_DUET_ADS */

/* ========================================================================= */

#ifdef CONFIG_FADS /* SDRAM exists on FADS and newer boards */

#if defined(CONFIG_SDRAM_100MHZ)

/* ------------------------------------------------------------------------- */
/* sdram table by Dan Malek                                                  */

/* This has the stretched early timing so the 50 MHz
 * processor can make the 100 MHz timing.  This will
 * work at all processor speeds.
 */

#ifdef SDRAM_ALT_INIT_SEQENCE
# define SDRAM_MBMRVALUE0 0xc3802114 /* PTx=195,PTxE,AMx=0,DSx=1,A11,RLFx=1,WLFx=1,TLFx=4 */
#define SDRAM_MBMRVALUE1 SDRAM_MBMRVALUE0
# define SDRAM_MCRVALUE0  0x80808111   /* run upmb cs4 loop 1 addr 0x11 MRS */
# define SDRAM_MCRVALUE1  SDRAM_MCRVALUE0  /* ??? why not 0x80808130? */
#else
# define SDRAM_MxMR_PTx         195
# define UPM_MRS_ADDR           0x11
# define UPM_REFRESH_ADDR       0x30    /* or 0x11 if we want to be like above? */
#endif /* !SDRAM_ALT_INIT_SEQUENCE */

static const uint sdram_table[] =
{
	/* single read. (offset 0 in upm RAM) */
	0xefebfc24, 0x1f07fc24, 0xeeaefc04, 0x11adfc04,
	0xefbbbc00, 0x1ff77c45, _NOT_USED_, _NOT_USED_,

	/* burst read. (offset 8 in upm RAM) */
	0xefebfc24, 0x1f07fc24, 0xeeaefc04, 0x10adfc04,
	0xf0affc00, 0xf0affc00, 0xf1affc00, 0xefbbbc00,
	0x1ff77c45,

	/* precharge + MRS. (offset 11 in upm RAM) */
	0xeffbbc04, 0x1ff77c34, 0xefeabc34,
	0x1fb57c35, _NOT_USED_, _NOT_USED_, _NOT_USED_,

	/* single write. (offset 18 in upm RAM) */
	0xefebfc24, 0x1f07fc24, 0xeeaebc00, 0x01b93c04,
	0x1ff77c45, _NOT_USED_, _NOT_USED_, _NOT_USED_,

	/* burst write. (offset 20 in upm RAM) */
	0xefebfc24, 0x1f07fc24, 0xeeaebc00, 0x10ad7c00,
	0xf0affc00, 0xf0affc00, 0xe1bbbc04, 0x1ff77c45,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

	/* refresh. (offset 30 in upm RAM) */
	0xeffafc84, 0x1ff5fc04, 0xfffffc04, 0xfffffc04,
	0xfffffc84, 0xfffffc07, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

	/* exception. (offset 3c in upm RAM) */
	0xeffffc06, 0x1ffffc07, _NOT_USED_, _NOT_USED_ };

#elif defined(CONFIG_SDRAM_50MHZ)

/* ------------------------------------------------------------------------- */
/* sdram table stolen from the fads manual                                   */
/* for chip MB811171622A-100                                                 */

/* this table is for 32-50MHz operation */
#ifdef SDRAM_ALT_INIT_SEQENCE
# define SDRAM_MBMRVALUE0 0x80802114   /* PTx=128,PTxE,AMx=0,DSx=1,A11,RLFx=1,WLFx=1,TLFx=4 */
# define SDRAM_MBMRVALUE1 0x80802118   /* PTx=128,PTxE,AMx=0,DSx=1,A11,RLFx=1,WLFx=1,TLFx=8 */
# define SDRAM_MCRVALUE0  0x80808105   /* run upmb cs4 loop 1 addr 0x5 MRS */
# define SDRAM_MCRVALUE1  0x80808130   /* run upmb cs4 loop 1 addr 0x30 REFRESH */
# define SDRAM_MPTRVALUE  0x400
#define SDRAM_MARVALUE   0x88
#else
# define SDRAM_MxMR_PTx         128
# define UPM_MRS_ADDR           0x5
# define UPM_REFRESH_ADDR       0x30
#endif  /* !SDRAM_ALT_INIT_SEQUENCE */

static const uint sdram_table[] =
{
	/* single read. (offset 0 in upm RAM) */
	0x1f07fc04, 0xeeaefc04, 0x11adfc04, 0xefbbbc00,
	0x1ff77c47,

	/* precharge + MRS. (offset 5 in upm RAM) */
	0x1ff77c34, 0xefeabc34, 0x1fb57c35,

	/* burst read. (offset 8 in upm RAM) */
	0x1f07fc04, 0xeeaefc04, 0x10adfc04, 0xf0affc00,
	0xf0affc00, 0xf1affc00, 0xefbbbc00, 0x1ff77c47,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

	/* single write. (offset 18 in upm RAM) */
	0x1f27fc04, 0xeeaebc00, 0x01b93c04, 0x1ff77c47,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

	/* burst write. (offset 20 in upm RAM) */
	0x1f07fc04, 0xeeaebc00, 0x10ad7c00, 0xf0affc00,
	0xf0affc00, 0xe1bbbc04, 0x1ff77c47, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

	/* refresh. (offset 30 in upm RAM) */
	0x1ff5fc84, 0xfffffc04, 0xfffffc04, 0xfffffc04,
	0xfffffc84, 0xfffffc07, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

	/* exception. (offset 3c in upm RAM) */
	0x7ffffc07, _NOT_USED_, _NOT_USED_, _NOT_USED_ };

/* ------------------------------------------------------------------------- */
#else
#error SDRAM not correctly configured
#endif
/* ------------------------------------------------------------------------- */

/*
 * Memory Periodic Timer Prescaler
 */

#define SDRAM_OR4VALUE   0x00000a00 /* SAM,GL5A/S=01,addr mask or'ed on later */
#define SDRAM_BR4VALUE   0x000000c1 /* UPMB,base addr or'ed on later */

/* ------------------------------------------------------------------------- */
#ifdef SDRAM_ALT_INIT_SEQENCE
/* ------------------------------------------------------------------------- */

static int _initsdram(uint base, uint noMbytes)
{
	volatile immap_t     *immap = (immap_t *)CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;

	upmconfig(UPMB, (uint *)sdram_table,sizeof(sdram_table)/sizeof(uint));

	memctl->memc_mptpr = SDRAM_MPTPRVALUE;

	/* Configure the refresh (mostly).  This needs to be
	* based upon processor clock speed and optimized to provide
	* the highest level of performance.  For multiple banks,
	* this time has to be divided by the number of banks.
	* Although it is not clear anywhere, it appears the
	* refresh steps through the chip selects for this UPM
	* on each refresh cycle.
	* We have to be careful changing
	* UPM registers after we ask it to run these commands.
	*/

	memctl->memc_mbmr = SDRAM_MBMRVALUE0;   /* TLF 4 */
	memctl->memc_mar = SDRAM_MARVALUE;  /* MRS code */

	udelay(200);

	/* Now run the precharge/nop/mrs commands.
	*/

	memctl->memc_mcr = 0x80808111;   /* run umpb cs4 1 count 1, addr 0x11 ??? (50Mhz) */
	                                 /* run umpb cs4 1 count 1, addr 0x11 precharge+MRS (100Mhz) */
	udelay(200);

	/* Run 8 refresh cycles */

	memctl->memc_mcr = SDRAM_MCRVALUE0; /* run upmb cs4 loop 1 addr 0x5 precharge+MRS (50 Mhz)*/
					    /* run upmb cs4 loop 1 addr 0x11 precharge+MRS (100MHz) */

	udelay(200);

	memctl->memc_mbmr = SDRAM_MBMRVALUE1; /* TLF 4 (100 Mhz) or TLF 8 (50MHz) */
	memctl->memc_mcr = SDRAM_MCRVALUE1; /* run upmb cs4 loop 1 addr 0x30 refr (50 Mhz) */
					    /* run upmb cs4 loop 1 addr 0x11 precharge+MRS ??? (100MHz) */

	udelay(200);

	memctl->memc_mbmr = SDRAM_MBMRVALUE0;   /* TLF 4 */

	memctl->memc_or4 = SDRAM_OR4VALUE | ~((noMbytes<<20)-1);
	memctl->memc_br4 = SDRAM_BR4VALUE | base;

	return 0;
}

/* ------------------------------------------------------------------------- */
#else  /* !SDRAM_ALT_INIT_SEQUENCE */
/* ------------------------------------------------------------------------- */

/* refresh rate 15.6 us (= 64 ms / 4K = 62.4 / quad bursts) for <= 128 MBit     */
# define MPTPR_2BK_4K        MPTPR_PTP_DIV16         /* setting for 2 banks  */
# define MPTPR_1BK_4K        MPTPR_PTP_DIV32         /* setting for 1 bank   */

/* refresh rate 7.8 us (= 64 ms / 8K = 31.2 / quad bursts) for 256 MBit         */
# define MPTPR_2BK_8K        MPTPR_PTP_DIV8          /* setting for 2 banks  */
# define MPTPR_1BK_8K        MPTPR_PTP_DIV16         /* setting for 1 bank   */

/*
 * MxMR settings for SDRAM
 */

/* 8 column SDRAM */
# define SDRAM_MxMR_8COL ((SDRAM_MxMR_PTx << MBMR_PTB_SHIFT)  | MBMR_PTBE  |   \
			MBMR_AMB_TYPE_0 | MBMR_DSB_1_CYCL | MBMR_G0CLB_A11 |   \
			MBMR_RLFB_1X    | MBMR_WLFB_1X    | MBMR_TLFB_4X)
/* 9 column SDRAM */
# define SDRAM_MxMR_9COL ((SDRAM_MxMR_PTx << MBMR_PTB_SHIFT)  | MBMR_PTAE  |   \
			MBMR_AMB_TYPE_1 | MBMR_DSB_1_CYCL | MBMR_G0CLB_A10 |   \
			MBMR_RLFB_1X    | MBMR_WLFB_1X    | MBMR_TLFB_4X)

static int _initsdram(uint base, uint noMbytes)
{
	volatile immap_t     *immap = (immap_t *)CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;

	upmconfig(UPMB, (uint *)sdram_table,sizeof(sdram_table)/sizeof(uint));

	memctl->memc_mptpr = MPTPR_2BK_4K;
	memctl->memc_mbmr  = SDRAM_MxMR_8COL & (~(MBMR_PTBE)); /* no refresh yet */

	/* map CS 4 */
	memctl->memc_or4 = SDRAM_OR4VALUE | ~((noMbytes<<20)-1);
	memctl->memc_br4 = SDRAM_BR4VALUE | base;

	/* Perform SDRAM initilization */
# ifdef UPM_NOP_ADDR    /* not currently in UPM table */
	/* step 1: nop */
	memctl->memc_mar = 0x00000000;
	memctl->memc_mcr = MCR_UPM_B | MCR_OP_RUN | MCR_MB_CS4 |
			   MCR_MLCF(0) | UPM_NOP_ADDR;
# endif

	/* step 2: delay */
	udelay(200);

# ifdef UPM_PRECHARGE_ADDR /* merged with MRS in UPM table */
	/* step 3: precharge */
	memctl->memc_mar = 0x00000000;
	memctl->memc_mcr = MCR_UPM_B | MCR_OP_RUN | MCR_MB_CS4 |
			   MCR_MLCF(4) | UPM_PRECHARGE_ADDR;
# endif

	/* step 4: refresh */
	memctl->memc_mar = 0x00000000;
	memctl->memc_mcr = MCR_UPM_B | MCR_OP_RUN | MCR_MB_CS4 |
			   MCR_MLCF(2) | UPM_REFRESH_ADDR;

	/*
	 * note: for some reason, the UPM values we are using include
	 * precharge with MRS
	 */

	/* step 5: mrs */
	memctl->memc_mar = 0x00000088;
	memctl->memc_mcr = MCR_UPM_B | MCR_OP_RUN | MCR_MB_CS4 |
			   MCR_MLCF(1) | UPM_MRS_ADDR;

# ifdef UPM_NOP_ADDR
	memctl->memc_mar = 0x00000000;
	memctl->memc_mcr = MCR_UPM_B | MCR_OP_RUN | MCR_MB_CS4 |
			   MCR_MLCF(0) | UPM_NOP_ADDR;
# endif
	/*
	 * Enable refresh
	 */

	memctl->memc_mbmr |= MBMR_PTBE;
	return 0;
}
#endif  /* !SDRAM_ALT_INIT_SEQUENCE */

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

static void _sdramdisable(void)
{
	volatile immap_t     *immap = (immap_t *)CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;

	memctl->memc_br4 = 0x00000000;

	/* maybe we should turn off upmb here or something */
}

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

static int initsdram(uint base, uint *noMbytes)
{
	uint m = CFG_SDRAM_SIZE>>20;

	/* _initsdram needs access to sdram */
	*((uint *)BCSR1) |= BCSR1_SDRAM_EN; /* enable sdram */

	if(!_initsdram(base, m))
	{
	        *noMbytes += m;
		return 0;
	}
	else
	{
		*((uint *)BCSR1) &= ~BCSR1_SDRAM_EN; /* disable sdram */

		_sdramdisable();

		return -1;
	}
}

#endif /* CONFIG_FADS */

/* ========================================================================= */

long int initdram (int board_type)
{
	uint sdramsz = 0;	/* size of sdram in Mbytes */
	uint base = 0;		/* base of dram in bytes */
	uint m = 0;		/* size of dram in Mbytes */
#ifndef CONFIG_DUET_ADS
	uint k, s;
#endif

#ifdef CONFIG_FADS
	if (!initsdram (0x00000000, &sdramsz)) {
		base = sdramsz << 20;
		printf ("(%u MB SDRAM) ", sdramsz);
	}
#endif
#ifndef CONFIG_DUET_ADS /* No old DRAM on Duet */
	k = (*((uint *) BCSR2) >> 23) & 0x0f;

	switch (k & 0x3) {
		/* "MCM36100 / MT8D132X" */
	case 0x00:
		m = 4;
		break;

		/* "MCM36800 / MT16D832X" */
	case 0x01:
		m = 32;
		break;
		/* "MCM36400 / MT8D432X" */
	case 0x02:
		m = 16;
		break;
		/* "MCM36200 / MT16D832X ?" */
	case 0x03:
		m = 8;
		break;

	}

	switch (k >> 2) {
	case 0x02:
		k = 70;
		break;

	case 0x03:
		k = 60;
		break;

	default:
		printf ("unknown dramdelay (0x%x) - defaulting to 70 ns", k);
		k = 70;
	}

#ifdef CONFIG_FADS
	/* the FADS is missing this bit, all rams treated as non-edo */
	s = 0;
#else
	s = (*((uint *) BCSR2) >> 27) & 0x01;
#endif

	if (!_draminit (base, m, s, k)) {
		printf ("%dM %dns %sDRAM: ", m, k, s ? "EDO " : "");
	} else {
		_dramdisable ();
		m = 0;
	}
#endif /* !CONFIG_DUET_ADS */
	m += sdramsz;				/* add sdram size to total */

	return (m << 20);
}

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

int testdram (void)
{
    /* TODO: XXX XXX XXX */
    printf ("test: 16 MB - ok\n");

    return (0);
}

/* ========================================================================= */

/*
 * Check Board Identity:
 */

#if defined(CONFIG_FADS) && defined(CFG_DAUGHTERBOARD)
static void checkdboard(void)
{
	/* get db type from BCSR 3 */
	uint k = (*((uint *)BCSR3) >> 24) & 0x3f;

	puts (" with db ");

	switch(k) {
	case 0x03 :
		puts ("MPC823");
		break;
	case 0x20 :
		puts ("MPC801");
		break;
	case 0x21 :
		puts ("MPC850");
		break;
	case 0x22 :
		puts ("MPC821, MPC860 / MPC860SAR / MPC860T");
		break;
	case 0x23 :
		puts ("MPC860SAR");
		break;
	case 0x24 :
	case 0x2A :
		puts ("MPC860T");
		break;
	case 0x3F :
		puts ("MPC850SAR");
		break;
	default : printf("0x%x", k);
	}
}
#endif	/* defined(CONFIG_FADS) && defined(CFG_DAUGHTERBOARD) */

int checkboard (void)
{
	/* get revision from BCSR 3 */
	uint r =  (((*((uint *) BCSR3) >> 23) & 1) << 3)
		| (((*((uint *) BCSR3) >> 19) & 1) << 2)
		| (((*((uint *) BCSR3) >> 16) & 3));

	puts ("Board: ");

#if defined(CONFIG_MPC86xADS)
	puts ("MPC86xADS");
#elif defined(CONFIG_DUET_ADS)
	puts ("DUET ADS");
	r = 0; /* I've got NR (No Revision) board */
#elif defined(CONFIG_FADS)
	puts ("FADS");
	checkdboard ();
#else
	puts ("ADS");
#endif
	puts (" rev ");

	switch (r) {
#if defined(CONFIG_ADS)
	case 0x00:
		puts ("ENG - this board sucks, check the errata, not supported\n");
		return -1;
	case 0x01:
		puts ("PILOT - warning, read errata \n");
		break;
	case 0x02:
		puts ("A - warning, read errata \n");
		break;
	case 0x03:
		puts ("B \n");
		break;
#elif defined(CONFIG_DUET_ADS)
	case 0x00:
		puts ("NR\n");
		break;
#else  /* FADS and newer */
	case 0x00:
		puts ("ENG\n");
		break;
	case 0x01:
		puts ("PILOT\n");
		break;
#endif /* CONFIG_ADS */
	default:
		printf ("unknown (0x%x)\n", r);
		return -1;
	}

	return 0;
}

/* ========================================================================= */

#if (CONFIG_COMMANDS & CFG_CMD_PCMCIA)

#ifdef CFG_PCMCIA_MEM_ADDR
volatile unsigned char *pcmcia_mem = (unsigned char*)CFG_PCMCIA_MEM_ADDR;
#endif

int pcmcia_init(void)
{
	volatile pcmconf8xx_t	*pcmp;
	uint v, slota, slotb;

	/*
	** Enable the PCMCIA for a Flash card.
	*/
	pcmp = (pcmconf8xx_t *)(&(((immap_t *)CFG_IMMR)->im_pcmcia));

#if 0
	pcmp->pcmc_pbr0 = CFG_PCMCIA_MEM_ADDR;
	pcmp->pcmc_por0 = 0xc00ff05d;
#endif

	/* Set all slots to zero by default. */
	pcmp->pcmc_pgcra = 0;
	pcmp->pcmc_pgcrb = 0;
#ifdef PCMCIA_SLOT_A
	pcmp->pcmc_pgcra = 0x40;
#endif
#ifdef PCMCIA_SLOT_B
	pcmp->pcmc_pgcrb = 0x40;
#endif

	/* enable PCMCIA buffers */
	*((uint *)BCSR1) &= ~BCSR1_PCCEN;

	/* Check if any PCMCIA card is plugged in. */

	slota = (pcmp->pcmc_pipr & 0x18000000) == 0 ;
	slotb = (pcmp->pcmc_pipr & 0x00001800) == 0 ;

	if (!(slota || slotb)) {
		printf("No card present\n");
#ifdef PCMCIA_SLOT_A
		pcmp->pcmc_pgcra = 0;
#endif
#ifdef PCMCIA_SLOT_B
		pcmp->pcmc_pgcrb = 0;
#endif
		return -1;
	}
	else
		printf("Card present (");

	v = 0;

	/* both the ADS and the FADS have a 5V keyed pcmcia connector (?)
	**
	** Paolo - Yes, but i have to insert some 3.3V card in that slot on
	**	   my FADS... :-)
	*/

#if defined(CONFIG_MPC86x)
	switch ((pcmp->pcmc_pipr >> 30) & 3)
#elif defined(CONFIG_MPC823) || defined(CONFIG_MPC850)
	switch ((pcmp->pcmc_pipr >> 14) & 3)
#endif
	{
	case 0x00 :
		printf("5V");
		v = 5;
		break;
	case 0x01 :
		printf("5V and 3V");
#ifdef CONFIG_FADS
		v = 3; /* User lower voltage if supported! */
#else
		v = 5;
#endif
		break;
	case 0x03 :
		printf("5V, 3V and x.xV");
#ifdef CONFIG_FADS
		v = 3; /* User lower voltage if supported! */
#else
		v = 5;
#endif
		break;
	}

	switch (v) {
#ifdef CONFIG_FADS
	case 3:
		printf("; using 3V");
		/*
		** Enable 3 volt Vcc.
		*/
		*((uint *)BCSR1) &= ~BCSR1_PCCVCC1;
		*((uint *)BCSR1) |= BCSR1_PCCVCC0;
		break;
#endif
	case 5:
		printf("; using 5V");
#ifdef CONFIG_ADS
		/*
		** Enable 5 volt Vcc.
		*/
		*((uint *)BCSR1) &= ~BCSR1_PCCVCCON;
#endif
#ifdef CONFIG_FADS
		/*
		** Enable 5 volt Vcc.
		*/
		*((uint *)BCSR1) &= ~BCSR1_PCCVCC0;
		*((uint *)BCSR1) |= BCSR1_PCCVCC1;
#endif
		break;

	default:
		*((uint *)BCSR1) |= BCSR1_PCCEN;  /* disable pcmcia */

		printf("; unknown voltage");
		return -1;
	}
	printf(")\n");
	/* disable pcmcia reset after a while */

	udelay(20);

#ifdef PCMCIA_SLOT_A
	pcmp->pcmc_pgcra = 0;
#elif PCMCIA_SLOT_B
	pcmp->pcmc_pgcrb = 0;
#endif

	/* If you using a real hd you should give a short
	* spin-up time. */
#ifdef CONFIG_DISK_SPINUP_TIME
	udelay(CONFIG_DISK_SPINUP_TIME);
#endif

	return 0;
}

#endif	/* CFG_CMD_PCMCIA */

/* ========================================================================= */

#ifdef CFG_PC_IDE_RESET

void ide_set_reset(int on)
{
	volatile immap_t *immr = (immap_t *)CFG_IMMR;

	/*
	 * Configure PC for IDE Reset Pin
	 */
	if (on) {		/* assert RESET */
		immr->im_ioport.iop_pcdat &= ~(CFG_PC_IDE_RESET);
	} else {		/* release RESET */
		immr->im_ioport.iop_pcdat |=   CFG_PC_IDE_RESET;
	}

	/* program port pin as GPIO output */
	immr->im_ioport.iop_pcpar &= ~(CFG_PC_IDE_RESET);
	immr->im_ioport.iop_pcso  &= ~(CFG_PC_IDE_RESET);
	immr->im_ioport.iop_pcdir |=   CFG_PC_IDE_RESET;
}

#endif	/* CFG_PC_IDE_RESET */