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/*
* (C) Copyright 2003
* MuLogic B.V.
*
* (C) Copyright 2002
* Simple Network Magic Corporation, dnevil@snmc.com
*
* (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
*/
#include <common.h>
#include <asm/u-boot.h>
#include <commproc.h>
#include "mpc8xx.h"
/* ------------------------------------------------------------------------- */
static long int dram_size (long int, long int *, long int);
/* ------------------------------------------------------------------------- */
const uint sdram_table[] =
{
/*
* Single Read. (Offset 0 in UPMA RAM)
*/
0x0f07cc04, 0x00adcc04, 0x00a74c00, 0x00bfcc04,
0x1fffcc05, 0xffffcc05, 0xffffcc05, 0xffffcc05,
/*
* Burst Read. (Offset 8 in UPMA RAM)
*/
0x0ff7fc04, 0x0ffffc04, 0x00bdfc04, 0x00fffc00,
0x00fffc00, 0x00fffc00, 0x0ff77c00, 0x1ffffc05,
0x1ffffc05, 0x1ffffc05, 0x1ffffc05, 0x1ffffc05,
0x1ffffc05, 0x1ffffc05, 0x1ffffc05, 0x1ffffc05,
/*
* Single Write. (Offset 18 in UPMA RAM)
*/
0x0f07cc04, 0x0fafcc00, 0x01ad0c04, 0x1ff74c07,
0xffffcc05, 0xffffcc05, 0xffffcc05, 0xffffcc05,
/*
* Burst Write. (Offset 20 in UPMA RAM)
*/
0x0ff7fc04, 0x0ffffc00, 0x00bd7c00, 0x00fffc00,
0x00fffc00, 0x00fffc00, 0x0ffffc04, 0x0ff77c04,
0x1ffffc05, 0x1ffffc05, 0x1ffffc05, 0x1ffffc05,
0x1ffffc05, 0x1ffffc05, 0x1ffffc05, 0x1ffffc05,
/*
* Refresh (Offset 30 in UPMA RAM)
*/
0xffffcc04, 0x1ff5cc84, 0xffffcc04, 0xffffcc04,
0xffffcc84, 0xffffcc05, 0xffffcc04, 0xffffcc04,
0xffffcc04, 0xffffcc04, 0xffffcc04, 0xffffcc04,
/*
* Exception. (Offset 3c in UPMA RAM)
*/
0x1ff74c04, 0xffffcc07, 0xffffaa34, 0x1fb54a37
};
/* ------------------------------------------------------------------------- */
/*
* Check Board Identity:
*
* Test ID string (QS850, QS823, ...)
*
* Always return 1
*/
int checkboard (void)
{
unsigned char *s, *e;
unsigned char buf[64];
int i;
i = getenv_r("serial#", buf, sizeof(buf));
s = (i>0) ? buf : NULL;
#ifdef CONFIG_QS850
if (!s || strncmp(s, "QS850", 5)) {
puts ("### No HW ID - assuming QS850");
#endif
#ifdef CONFIG_QS823
if (!s || strncmp(s, "QS823", 5)) {
puts ("### No HW ID - assuming QS823");
#endif
} else {
for (e=s; *e; ++e) {
if (*e == ' ')
break;
}
for ( ; s<e; ++s) {
putc (*s);
}
}
putc ('\n');
return (0);
}
/* ------------------------------------------------------------------------- */
/* SDRAM Mode Register Definitions */
/* Set SDRAM Burst Length to 4 (010) */
/* See Motorola MPC850 User Manual, Page 13-14 */
#define SDRAM_BURST_LENGTH (2)
/* Set Wrap Type to Sequential (0) */
/* See Motorola MPC850 User Manual, Page 13-14 */
#define SDRAM_WRAP_TYPE (0 << 3)
/* Set /CAS Latentcy to 2 clocks */
#define SDRAM_CAS_LATENTCY (2 << 4)
/* The Mode Register value must be shifted left by 2, since it is */
/* placed on the address bus, and the 2 LSBs are ignored for 32-bit accesses */
#define SDRAM_MODE_REG ((SDRAM_BURST_LENGTH|SDRAM_WRAP_TYPE|SDRAM_CAS_LATENTCY) << 2)
#define UPMA_RUN(loops,index) (0x80002000 + (loops<<8) + index)
/* Please note a value of zero = 16 loops */
#define REFRESH_INIT_LOOPS (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;
upmconfig(UPMA, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint));
/*
* Prescaler for refresh
*/
memctl->memc_mptpr = CFG_MPTPR;
/*
* Map controller bank 1 to the SDRAM address
*/
memctl->memc_or1 = CFG_OR1;
memctl->memc_br1 = CFG_BR1;
udelay(1000);
/* perform SDRAM initialization sequence */
memctl->memc_mamr = CFG_16M_MAMR;
udelay(100);
/* Program the SDRAM's Mode Register */
memctl->memc_mar = SDRAM_MODE_REG;
/* Run the Prechard Pattern at 0x3C */
memctl->memc_mcr = UPMA_RUN(1,0x3c);
udelay(1);
/* Run the Refresh program residing at MAD index 0x30 */
/* This contains the CBR Refresh command with a loop */
/* The SDRAM must be refreshed at least 2 times */
/* Please note a value of zero = 16 loops */
memctl->memc_mcr = UPMA_RUN(REFRESH_INIT_LOOPS,0x30);
udelay(1);
/* Run the Exception program residing at MAD index 0x3E */
/* This contains the Write Mode Register command */
/* The Write Mode Register command uses the value written to MAR */
memctl->memc_mcr = UPMA_RUN(1,0x3e);
udelay (1000);
/*
* Check for 32M SDRAM Memory Size
*/
size = dram_size(CFG_32M_MAMR|MAMR_PTAE,
(ulong *)SDRAM_BASE, SDRAM_32M_MAX_SIZE);
udelay (1000);
/*
* Check for 16M SDRAM Memory Size
*/
if (size != SDRAM_32M_MAX_SIZE) {
size = dram_size(CFG_16M_MAMR|MAMR_PTAE,
(ulong *)SDRAM_BASE, SDRAM_16M_MAX_SIZE);
udelay (1000);
}
udelay(10000);
return (size);
}
/* ------------------------------------------------------------------------- */
/*
* 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 mamr_value, long int *base, long int maxsize)
{
volatile immap_t *immap = (immap_t *)CFG_IMMR;
volatile memctl8xx_t *memctl = &immap->im_memctl;
volatile long int *addr;
long int cnt, val;
memctl->memc_mamr = mamr_value;
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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