RPXlite_dw.c
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/*
* (C) Copyright 2004
* Sam Song, IEMC. SHU, samsongshu@yahoo.com.cn
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* Sam Song
* U-Boot port on RPXlite DW board : RPXlite_DW or LITE_DW
* Tested on working at 64MHz(CPU)/32MHz(BUS),48MHz/24MHz
* with 64MB, 2 SDRAM Micron chips,MT48LC16M16A2-75.
*/
#include <common.h>
#include <mpc8xx.h>
/* ------------------------------------------------------------------------- */
static long int dram_size (long int, long int *, long int);
/* ------------------------------------------------------------------------- */
#define _NOT_USED_ 0xFFFFCC25
const uint sdram_table[] =
{
/*
* Single Read. (Offset 00h in UPMA RAM)
*/
0x0F03CC04, 0x00ACCC24, 0x1FF74C20, /* last */
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_,
/*
* Burst Read. (Offset 08h in UPMA RAM)
*/
0x0F03CC04, 0x00ACCC24, 0x00FFCC20, 0x00FFCC20,
0x01FFCC20, 0x1FF74C20, /* last */
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_,
/*
* Single Write. (Offset 18h in UPMA RAM)
*/
0x0F03CC02, 0x00AC0C24, 0x1FF74C25, /* last */
_NOT_USED_, _NOT_USED_, 0x0FA00C34,0x0FFFCC35,
_NOT_USED_,
/*
* Burst Write. (Offset 20h in UPMA RAM)
*/
0x0F03CC00, 0x00AC0C20, 0x00FFFC20, 0x00FFFC22,
0x01FFFC24, 0x1FF74C25, /* last */
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_,
/*
* Refresh. (Offset 30h in UPMA RAM)
*/
0x0FF0CC24, 0xFFFFCC24, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_, 0xEFFB8C34, 0x0FF74C34,
0x0FFACCB4, 0x0FF5CC34, 0x0FFFCC34, 0x0FFFCCB4,
/* INIT sequence RAM WORDS
* SDRAM Initialization (offset 0x36 in UPMA RAM)
* The above definition uses the remaining space
* to establish an initialization sequence,
* which is executed by a RUN command.
* The sequence is COMMAND INHIBIT(NOP),Precharge,
* Load Mode Register,NOP,Auto Refresh.
*/
/*
* Exception. (Offset 3Ch in UPMA RAM)
*/
0x0FEA8C34, 0x1FB54C34, 0xFFFFCC34, _NOT_USED_
};
/*
* Check Board Identity:
*/
int checkboard (void)
{
puts ("Board: RPXlite_DW\n") ;
return (0) ;
}
/* ------------------------------------------------------------------------- */
phys_size_t initdram (int board_type)
{
volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
volatile memctl8xx_t *memctl = &immap->im_memctl;
long int size9;
upmconfig(UPMA, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint));
/* Refresh clock prescalar */
memctl->memc_mptpr = CONFIG_SYS_MPTPR ;
memctl->memc_mar = 0x00000088;
/* Map controller banks 1 to the SDRAM bank */
memctl->memc_or1 = CONFIG_SYS_OR1_PRELIM;
memctl->memc_br1 = CONFIG_SYS_BR1_PRELIM;
memctl->memc_mamr = CONFIG_SYS_MAMR_9COL & (~(MAMR_PTAE)); /* no refresh yet */
/*Disable Periodic timer A. */
udelay(200);
/* perform SDRAM initializsation sequence */
memctl->memc_mcr = 0x80002236; /* SDRAM bank 0 - refresh twice */
udelay(1);
memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */
/*Enable Periodic timer A */
udelay (1000);
/* Check Bank 0 Memory Size
* try 9 column mode
*/
size9 = dram_size (CONFIG_SYS_MAMR_9COL, SDRAM_BASE_PRELIM, SDRAM_MAX_SIZE);
/*
* Final mapping:
*/
memctl->memc_or1 = ((-size9) & 0xFFFF0000) | CONFIG_SYS_OR_TIMING_SDRAM;
udelay (1000);
return (size9);
}
void rpxlite_init (void)
{
/* Enable NVRAM */
*((uchar *) BCSR0) |= BCSR0_ENNVRAM;
}
/*
* 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 *) CONFIG_SYS_IMMR;
volatile memctl8xx_t *memctl = &immap->im_memctl;
memctl->memc_mamr = mamr_value;
return (get_ram_size (base, maxsize));
}