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authorGerlando Falauto <gerlando.falauto@keymile.com>2012-07-27 05:16:38 +0000
committerWolfgang Denk <wd@denx.de>2012-07-31 22:36:31 +0200
commit3a532346fcf2aacc52351e3cb39f9c7a4850f70d (patch)
treead63cf6b4a91a48bd640e49541120dddcd75bf82
parent65c7f92313784e971bd688ea2ed3a8b1349c8d0a (diff)
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powerpc/82xx: add SDRAM detection for km82xx
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>
-rw-r--r--board/keymile/km82xx/km82xx.c51
1 files changed, 49 insertions, 2 deletions
diff --git a/board/keymile/km82xx/km82xx.c b/board/keymile/km82xx/km82xx.c
index 0e50b0b..67b69f6 100644
--- a/board/keymile/km82xx/km82xx.c
+++ b/board/keymile/km82xx/km82xx.c
@@ -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();