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/*
* (C) Copyright 2005
* Stefan Roese, DENX Software Engineering, sr@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/processor.h>
#include <asm/immap_85xx.h>
#include <asm/processor.h>
#include <asm/mmu.h>
struct sdram_conf_s {
unsigned long size;
unsigned long reg;
};
typedef struct sdram_conf_s sdram_conf_t;
sdram_conf_t ddr_cs_conf[] = {
{(512 << 20), 0x80000202}, /* 512MB, 14x10(4) */
{(256 << 20), 0x80000102}, /* 256MB, 13x10(4) */
{(128 << 20), 0x80000101}, /* 128MB, 13x9(4) */
{( 64 << 20), 0x80000001}, /* 64MB, 12x9(4) */
};
#define N_DDR_CS_CONF (sizeof(ddr_cs_conf) / sizeof(ddr_cs_conf[0]))
int cas_latency (void);
/*
* Autodetect onboard DDR SDRAM on 85xx platforms
*
* NOTE: Some of the hardcoded values are hardware dependant,
* so this should be extended for other future boards
* using this routine!
*/
long int sdram_setup (int casl)
{
int i;
volatile ccsr_ddr_t *ddr = (void *)(CFG_MPC85xx_DDR_ADDR);
unsigned long cfg_ddr_timing1;
unsigned long cfg_ddr_mode;
/*
* Disable memory controller.
*/
ddr->cs0_config = 0;
ddr->sdram_cfg = 0;
switch (casl) {
case 20:
cfg_ddr_timing1 = 0x47405331 | (3 << 16);
cfg_ddr_mode = 0x40020002 | (2 << 4);
break;
case 25:
cfg_ddr_timing1 = 0x47405331 | (4 << 16);
cfg_ddr_mode = 0x40020002 | (6 << 4);
break;
case 30:
default:
cfg_ddr_timing1 = 0x47405331 | (5 << 16);
cfg_ddr_mode = 0x40020002 | (3 << 4);
break;
}
ddr->cs0_bnds = (ddr_cs_conf[0].size - 1) >> 24;
ddr->cs0_config = ddr_cs_conf[0].reg;
ddr->timing_cfg_1 = cfg_ddr_timing1;
ddr->timing_cfg_2 = 0x00000800; /* P9-45,may need tuning */
ddr->sdram_mode = cfg_ddr_mode;
ddr->sdram_interval = 0x05160100; /* autocharge,no open page */
ddr->err_disable = 0x0000000D;
asm ("sync; isync; msync");
udelay (1000);
ddr->sdram_cfg = 0xc2000000; /* unbuffered,no DYN_PWR */
asm ("sync; isync; msync");
udelay (1000);
for (i = 0; i < N_DDR_CS_CONF; i++) {
ddr->cs0_config = ddr_cs_conf[i].reg;
if (get_ram_size (0, ddr_cs_conf[i].size) ==
ddr_cs_conf[i].size) {
/*
* size detected -> set Chip Select Bounds Register
*/
ddr->cs0_bnds = (ddr_cs_conf[i].size - 1) >> 24;
return ddr_cs_conf[i].size;
}
}
return 0; /* nothing found ! */
}
void board_add_ram_info (int use_default)
{
int casl;
if (use_default)
casl = CONFIG_DDR_DEFAULT_CL;
else
casl = cas_latency ();
puts (" (CL=");
switch (casl) {
case 20:
puts ("2)");
break;
case 25:
puts ("2.5)");
break;
case 30:
puts ("3)");
break;
}
}
long int initdram (int board_type)
{
long dram_size = 0;
int casl;
#if defined(CONFIG_DDR_DLL)
/*
* This DLL-Override only used on TQM8540 and TQM8560
*/
{
volatile ccsr_gur_t *gur = (void *)(CFG_MPC85xx_GUTS_ADDR);
int i, x;
x = 10;
/*
* Work around to stabilize DDR DLL
*/
gur->ddrdllcr = 0x81000000;
asm ("sync; isync; msync");
udelay (200);
while (gur->ddrdllcr != 0x81000100) {
gur->devdisr = gur->devdisr | 0x00010000;
asm ("sync; isync; msync");
for (i = 0; i < x; i++)
;
gur->devdisr = gur->devdisr & 0xfff7ffff;
asm ("sync; isync; msync");
x++;
}
}
#endif
casl = cas_latency ();
dram_size = sdram_setup (casl);
if ((dram_size == 0) && (casl != CONFIG_DDR_DEFAULT_CL)) {
/*
* Try again with default CAS latency
*/
puts ("Problem with CAS lantency");
board_add_ram_info (1);
puts (", using default CL!\n");
casl = CONFIG_DDR_DEFAULT_CL;
dram_size = sdram_setup (casl);
puts (" ");
}
return dram_size;
}
#if defined(CFG_DRAM_TEST)
int testdram (void)
{
uint *pstart = (uint *) CFG_MEMTEST_START;
uint *pend = (uint *) CFG_MEMTEST_END;
uint *p;
printf ("SDRAM test phase 1:\n");
for (p = pstart; p < pend; p++)
*p = 0xaaaaaaaa;
for (p = pstart; p < pend; p++) {
if (*p != 0xaaaaaaaa) {
printf ("SDRAM test fails at: %08x\n", (uint) p);
return 1;
}
}
printf ("SDRAM test phase 2:\n");
for (p = pstart; p < pend; p++)
*p = 0x55555555;
for (p = pstart; p < pend; p++) {
if (*p != 0x55555555) {
printf ("SDRAM test fails at: %08x\n", (uint) p);
return 1;
}
}
printf ("SDRAM test passed.\n");
return 0;
}
#endif
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