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powerpc/82xx: add SDRAM detection for km82xx

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This patch adds SDRAM detection feature to km82xx boards.
To enable this feature, define CONFIG_SYS_SDRAM_LIST as the initializer
for an array of struct sdram_conf_s.
These structs will expose the bitfields within registers PSDMR and OR1 which
have to be different between configurations; common bitfields will be
defined, as usual, within CONFIG_SYS_PSDMR and CONFIG_SYS_OR1.
If CONFIG_SYS_SDRAM_LIST is not defined, then the usual behavior is retained.

Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com>
This commit is contained in:
Gerlando Falauto 2012-07-27 05:16:38 +00:00 committed by Wolfgang Denk
parent 65c7f92313
commit 3a532346fc
1 changed files with 49 additions and 2 deletions
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51
board/keymile/km82xx/km82xx.c
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@ -261,6 +261,54 @@ static long int try_init(memctl8260_t *memctl, ulong sdmr,
return size;
}
#ifdef CONFIG_SYS_SDRAM_LIST
/*
* If CONFIG_SYS_SDRAM_LIST is defined, we cycle through all SDRAM
* configurations therein (should be from high to lower) to find the
* one actually matching the current configuration.
* CONFIG_SYS_PSDMR and CONFIG_SYS_OR1 will contain the base values which are
* common among all possible configurations; values in CONFIG_SYS_SDRAM_LIST
* (defined as the initialization value for the array of struct sdram_conf_s)
* will then be ORed with such base values.
*/
struct sdram_conf_s {
ulong size;
int or1;
int psdmr;
};
static struct sdram_conf_s sdram_conf[] = CONFIG_SYS_SDRAM_LIST;
static long probe_sdram(memctl8260_t *memctl)
{
int n = 0;
long psize = 0;
for (n = 0; n < ARRAY_SIZE(sdram_conf); psize = 0, n++) {
psize = try_init(memctl,
CONFIG_SYS_PSDMR | sdram_conf[n].psdmr,
CONFIG_SYS_OR1 | sdram_conf[n].or1,
(uchar *) CONFIG_SYS_SDRAM_BASE);
debug("Probing %ld bytes returned %ld\n",
sdram_conf[n].size, psize);
if (psize == sdram_conf[n].size)
break;
}
return psize;
}
#else /* CONFIG_SYS_SDRAM_LIST */
static long probe_sdram(memctl8260_t *memctl)
{
return try_init(memctl, CONFIG_SYS_PSDMR, CONFIG_SYS_OR1,
(uchar *) CONFIG_SYS_SDRAM_BASE);
}
#endif /* CONFIG_SYS_SDRAM_LIST */
phys_size_t initdram(int board_type)
{
immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
@ -274,8 +322,7 @@ phys_size_t initdram(int board_type)
#ifndef CONFIG_SYS_RAMBOOT
/* 60x SDRAM setup:
*/
psize = try_init(memctl, CONFIG_SYS_PSDMR, CONFIG_SYS_OR1,
(uchar *) CONFIG_SYS_SDRAM_BASE);
psize = probe_sdram(memctl);
#endif /* CONFIG_SYS_RAMBOOT */
icache_enable();