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/*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* 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
*
*
* Modified By Conn Clark to work with Esteem 192E 7/31/00
*
*/
#include <common.h>
#include <mpc8xx.h>
/* ------------------------------------------------------------------------- */
static long int dram_size ( long int *base, long int maxsize);
/* ------------------------------------------------------------------------- */
#define _NOT_USED_ 0xFFFFFFFF
const uint sdram_table[] =
{
/*
* Single Read. (Offset 0 in UPMA RAM)
*
* active, NOP, read, precharge, NOP */
0x0F27CC04, 0x0EAECC04, 0x00B98C04, 0x00F74C00,
0x11FFCC05, /* last */
/*
* SDRAM Initialization (offset 5 in UPMA RAM)
*
* This is no UPM entry point. The following definition uses
* the remaining space to establish an initialization
* sequence, which is executed by a RUN command.
* NOP, Program
*/
0x0F0A8C34, 0x1F354C37, /* last */
_NOT_USED_, /* Not used */
/*
* Burst Read. (Offset 8 in UPMA RAM)
* active, NOP, read, NOP, NOP, NOP, NOP, NOP */
0x0F37CC04, 0x0EFECC04, 0x00FDCC04, 0x00FFCC00,
0x00FFCC00, 0x01FFCC00, 0x0FFFCC00, 0x1FFFCC05, /* last */
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
/*
* Single Write. (Offset 18 in UPMA RAM)
* active, NOP, write, NOP, precharge, NOP */
0x0F27CC04, 0x0EAE8C00, 0x01BD4C04, 0x0FFB8C04,
0x0FF74C04, 0x1FFFCC05, /* last */
_NOT_USED_, _NOT_USED_,
/*
* Burst Write. (Offset 20 in UPMA RAM)
* active, NOP, write, NOP, NOP, NOP, NOP, NOP */
0x0F37CC04, 0x0EFE8C00, 0x00FD4C00, 0x00FFCC00,
0x00FFCC00, 0x01FFCC04, 0x0FFFCC04, 0x1FFFCC05, /* last */
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
/*
* Refresh (Offset 30 in UPMA RAM)
* precharge, NOP, auto_ref, NOP, NOP, NOP */
0x0FF74C34, 0x0FFACCB4, 0x0FF5CC34, 0x0FFFCC34,
0x0FFFCCB4, 0x1FFFCC35, /* last */
_NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
/*
* Exception. (Offset 3c in UPMA RAM)
*/
0x0FFB8C00, 0x1FF74C03, /* last */
_NOT_USED_, _NOT_USED_
};
/* ------------------------------------------------------------------------- */
/*
* Check Board Identity:
*/
int checkboard (void)
{
puts ("Board: Esteem 192E\n");
return(0);
}
/* ------------------------------------------------------------------------- */
long int initdram (int board_type)
{
volatile immap_t *immap = (immap_t *)CFG_IMMR;
volatile memctl8xx_t *memctl = &immap->im_memctl;
long int size_b0, size_b1;
/*
* Explain frequency of refresh here
*/
memctl->memc_mptpr = 0x0200; /* divide by 32 */
memctl->memc_mamr = 0x18003112; /*CFG_MAMR_8COL;*/ /* 0x18005112 TODO: explain here */
upmconfig(UPMA, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint));
/*
* Map cs 2 and 3 to the SDRAM banks 0 and 1 at
* preliminary addresses - these have to be modified after the
* SDRAM size has been determined.
*/
memctl->memc_or2 = CFG_OR2_PRELIM; /* not defined yet */
memctl->memc_br2 = CFG_BR2_PRELIM;
memctl->memc_or3 = CFG_OR3_PRELIM;
memctl->memc_br3 = CFG_BR3_PRELIM;
/* perform SDRAM initializsation sequence */
memctl->memc_mar = 0x00000088;
memctl->memc_mcr = 0x80004830; /* SDRAM bank 0 execute 8 refresh */
memctl->memc_mcr = 0x80004105; /* SDRAM bank 0 */
memctl->memc_mcr = 0x80006830; /* SDRAM bank 1 execute 8 refresh */
memctl->memc_mcr = 0x80006105; /* SDRAM bank 1 */
memctl->memc_mamr = CFG_MAMR_8COL; /* 0x18803112 start refresh timer TODO: explain here */
/* printf ("banks 0 and 1 are programed\n"); */
/*
* Check Bank 0 Memory Size for re-configuration
*
*/
size_b0 = dram_size ((ulong *)SDRAM_BASE2_PRELIM, SDRAM_MAX_SIZE);
size_b1 = dram_size ((ulong *)SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE);
printf ("\nbank 0 size %lu\nbank 1 size %lu\n",size_b0,size_b1);
/* printf ("bank 1 size %u\n",size_b1); */
if(size_b1 == 0) {
/*
* Adjust refresh rate if bank 0 isn't stuffed
*/
memctl->memc_mptpr = 0x0400; /* divide by 64 */
memctl->memc_br3 &= 0x0FFFFFFFE;
/*
* Adjust OR2 for size of bank 0
*/
memctl->memc_or2 |= 7 * size_b0;
}
else {
if(size_b0 < size_b1) {
memctl->memc_br2 &= 0x00007FFE;
memctl->memc_br3 &= 0x00007FFF;
/*
* Adjust OR3 for size of bank 1
*/
memctl->memc_or3 |= 15 * size_b1;
/*
* Adjust OR2 for size of bank 0
*/
memctl->memc_or2 |= 15 * size_b0;
memctl->memc_br2 += (size_b1 + 1);
}
else {
memctl->memc_br3 &= 0x00007FFE;
/*
* Adjust OR2 for size of bank 0
*/
memctl->memc_or2 |= 15 * size_b0;
/*
* Adjust OR3 for size of bank 1
*/
memctl->memc_or3 |= 15 * size_b1;
memctl->memc_br3 += (size_b0 + 1);
}
}
/* before leaving set all unused i/o pins to outputs */
/*
* --*Unused Pin List*--
*
* group/port bit number
* IP_B 0,1,3,4,5 Taken care of in pcmcia-cs-x.x.xx
* PA 5,7,8,9,14,15
* PB 22,23,31
* PC 4,5,6,7,10,11,12,13,14,15
* PD 5,6,7
*
*/
/*
* --*Pin Used for I/O List*--
*
* port input bit number output bit number either
* PB 18,26,27
* PD 3,4 8,9,10,11,12,13,14,15
*
*/
immap->im_ioport.iop_papar &= ~0x05C3; /* set pins as io */
immap->im_ioport.iop_padir |= 0x05C3; /* set pins as output */
immap->im_ioport.iop_paodr &= 0x0008; /* config pins 9 & 14 as normal outputs */
immap->im_ioport.iop_padat |= 0x05C3; /* set unused pins as high */
immap->im_cpm.cp_pbpar &= ~0x00001331; /* set unused port b pins as io */
immap->im_cpm.cp_pbdir |= 0x00001331; /* set unused port b pins as output */
immap->im_cpm.cp_pbodr &= ~0x00001331; /* config bits 18,22,23,26,27 & 31 as normal outputs */
immap->im_cpm.cp_pbdat |= 0x00001331; /* set T/E LED, /NV_CS, & /POWER_ADJ_CS and the rest to a high */
immap->im_ioport.iop_pcpar &= ~0x0F3F; /* set unused port c pins as io */
immap->im_ioport.iop_pcdir |= 0x0F3F; /* set unused port c pins as output */
immap->im_ioport.iop_pcso &= ~0x0F3F; /* clear special purpose bit for unused port c pins for clarity */
immap->im_ioport.iop_pcdat |= 0x0F3F; /* set unused port c pins high*/
immap->im_ioport.iop_pdpar &= 0xE000; /* set pins as io */
immap->im_ioport.iop_pddir &= 0xE000; /* set bit 3 & 4 as inputs */
immap->im_ioport.iop_pddir |= 0x07FF; /* set bits 5 - 15 as outputs */
immap->im_ioport.iop_pddat = 0x0055; /* set alternating pattern on test port */
return (size_b0 + size_b1);
}
/* ------------------------------------------------------------------------- */
/*
* Check memory range for valid RAM. A simple memory test determines
* the actually available RAM size between addresses `base' and
* `base + maxsize'. Some (not all) hardware errors are detected:
* - short between address lines
* - short between data lines
*/
static long int dram_size ( long int *base, long int maxsize)
{
volatile long int *addr;
long int cnt, val;
for (cnt = maxsize/sizeof(long); cnt > 0; cnt >>= 1) {
addr = base + cnt; /* pointer arith! */
*addr = ~cnt;
}
/* write 0 to base address */
addr = base;
*addr = 0;
/* check at base address */
if ((val = *addr) != 0) {
return (0);
}
for (cnt = 1; ; cnt <<= 1) {
addr = base + cnt; /* pointer arith! */
val = *addr;
if (val != (~cnt)) {
return (cnt * sizeof(long));
}
}
/* NOTREACHED */
}
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