sdram.c
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/*
* Copyright (c) 2004 Picture Elements, Inc.
* Stephen Williams (steve@icarus.com)
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/ppc4xx.h>
#include <asm/processor.h>
# define SDRAM_LEN 0x08000000
/*
* this is even after checkboard. It returns the size of the SDRAM
* that we have installed. This function is called by board_init_f
* in arch/powerpc/lib/board.c to initialize the memory and return what I
* found.
*/
phys_size_t initdram (int board_type)
{
/* Configure the SDRAMS */
/* disable memory controller */
mtdcr (SDRAM0_CFGADDR, SDRAM0_CFG);
mtdcr (SDRAM0_CFGDATA, 0x00000000);
udelay (500);
/* Clear SDRAM0_BESR0 (Bus Error Syndrome Register) */
mtdcr (SDRAM0_CFGADDR, SDRAM0_BESR0);
mtdcr (SDRAM0_CFGDATA, 0xffffffff);
/* Clear SDRAM0_BESR1 (Bus Error Syndrome Register) */
mtdcr (SDRAM0_CFGADDR, SDRAM0_BESR1);
mtdcr (SDRAM0_CFGDATA, 0xffffffff);
/* Clear SDRAM0_ECCCFG (disable ECC) */
mtdcr (SDRAM0_CFGADDR, SDRAM0_ECCCFG);
mtdcr (SDRAM0_CFGDATA, 0x00000000);
/* Clear SDRAM0_ECCESR (ECC Error Syndrome Register) */
mtdcr (SDRAM0_CFGADDR, SDRAM0_ECCESR);
mtdcr (SDRAM0_CFGDATA, 0xffffffff);
/* Timing register: CASL=2, PTA=2, CTP=2, LDF=1, RFTA=5, RCD=2 */
mtdcr (SDRAM0_CFGADDR, SDRAM0_TR);
mtdcr (SDRAM0_CFGDATA, 0x010a4016);
/* Memory Bank 0 Config == BA=0x00000000, SZ=64M, AM=3, BE=1 */
mtdcr (SDRAM0_CFGADDR, SDRAM0_B0CR);
mtdcr (SDRAM0_CFGDATA, 0x00084001);
/* Memory Bank 1 Config == BA=0x04000000, SZ=64M, AM=3, BE=1 */
mtdcr (SDRAM0_CFGADDR, SDRAM0_B1CR);
mtdcr (SDRAM0_CFGDATA, 0x04084001);
/* Memory Bank 2 Config == BE=0 */
mtdcr (SDRAM0_CFGADDR, SDRAM0_B2CR);
mtdcr (SDRAM0_CFGDATA, 0x00000000);
/* Memory Bank 3 Config == BE=0 */
mtdcr (SDRAM0_CFGADDR, SDRAM0_B3CR);
mtdcr (SDRAM0_CFGDATA, 0x00000000);
/* refresh timer = 0x400 */
mtdcr (SDRAM0_CFGADDR, SDRAM0_RTR);
mtdcr (SDRAM0_CFGDATA, 0x04000000);
/* Power management idle timer set to the default. */
mtdcr (SDRAM0_CFGADDR, SDRAM0_PMIT);
mtdcr (SDRAM0_CFGDATA, 0x07c00000);
udelay (500);
/* Enable banks (DCE=1, BPRF=1, ECCDD=1, EMDUL=1) */
mtdcr (SDRAM0_CFGADDR, SDRAM0_CFG);
mtdcr (SDRAM0_CFGDATA, 0x80e00000);
return SDRAM_LEN;
}
/*
* The U-Boot core, as part of the initialization to prepare for
* loading the monitor into SDRAM, requests of this function that the
* memory be tested. Return 0 if the memory tests OK.
*/
int testdram (void)
{
unsigned long idx;
unsigned val;
unsigned errors;
volatile unsigned long *sdram;
#ifdef DEBUG
printf ("SDRAM Controller Registers --\n");
mtdcr (SDRAM0_CFGADDR, SDRAM0_CFG);
val = mfdcr (SDRAM0_CFGDATA);
printf (" SDRAM0_CFG : 0x%08x\n", val);
mtdcr (SDRAM0_CFGADDR, 0x24);
val = mfdcr (SDRAM0_CFGDATA);
printf (" SDRAM0_STATUS: 0x%08x\n", val);
mtdcr (SDRAM0_CFGADDR, SDRAM0_B0CR);
val = mfdcr (SDRAM0_CFGDATA);
printf (" SDRAM0_B0CR : 0x%08x\n", val);
mtdcr (SDRAM0_CFGADDR, SDRAM0_B1CR);
val = mfdcr (SDRAM0_CFGDATA);
printf (" SDRAM0_B1CR : 0x%08x\n", val);
mtdcr (SDRAM0_CFGADDR, SDRAM0_TR);
val = mfdcr (SDRAM0_CFGDATA);
printf (" SDRAM0_TR : 0x%08x\n", val);
mtdcr (SDRAM0_CFGADDR, SDRAM0_RTR);
val = mfdcr (SDRAM0_CFGDATA);
printf (" SDRAM0_RTR : 0x%08x\n", val);
#endif
/* Wait for memory to be ready by testing MRSCMPbit
bit. Really, there should already have been plenty of time,
given it was started long ago. But, best to check. */
for (idx = 0; idx < 1000000; idx += 1) {
mtdcr (SDRAM0_CFGADDR, 0x24);
val = mfdcr (SDRAM0_CFGDATA);
if (val & 0x80000000)
break;
}
if (!(val & 0x80000000)) {
printf ("SDRAM ERROR: SDRAM0_STATUS never set!\n");
return 1;
}
/* Start memory test. */
printf ("test: %u MB - ", SDRAM_LEN / 1048576);
sdram = (unsigned long *) CONFIG_SYS_SDRAM_BASE;
printf ("write - ");
for (idx = 2; idx < SDRAM_LEN / 4; idx += 2) {
sdram[idx + 0] = idx;
sdram[idx + 1] = ~idx;
}
printf ("read - ");
errors = 0;
for (idx = 2; idx < SDRAM_LEN / 4; idx += 2) {
if (sdram[idx + 0] != idx)
errors += 1;
if (sdram[idx + 1] != ~idx)
errors += 1;
if (errors > 0)
break;
}
if (errors > 0) {
printf ("NOT OK\n");
printf ("FIRST ERROR at %p: 0x%08lx:0x%08lx != 0x%08lx:0x%08lx\n",
sdram + idx, sdram[idx + 0], sdram[idx + 1], idx, ~idx);
return 1;
}
printf ("ok\n");
return 0;
}