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authorLokesh Vutla <lokeshvutla@ti.com>2012-11-15 21:06:33 +0000
committerTom Rini <trini@ti.com>2012-12-10 08:55:25 -0700
commit86021143a3081bd62d85abcc48135a0babc0096a (patch)
tree024333068e9ef7e75011d72ae0489f5d71ab9e66 /arch/arm
parentc7f1cf5f29713e81f866063cdf7268c1cfc673ff (diff)
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omap: emif: configure emif only when required
DMM_LISA_MAP registers program whether memory is mapped on particular EMIF or not. Irrespective of these registers EMIF is getting configured. Correcting the same. Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/cpu/armv7/omap-common/emif-common.c41
1 files changed, 36 insertions, 5 deletions
diff --git a/arch/arm/cpu/armv7/omap-common/emif-common.c b/arch/arm/cpu/armv7/omap-common/emif-common.c
index 30dcf1b..88253cf 100644
--- a/arch/arm/cpu/armv7/omap-common/emif-common.c
+++ b/arch/arm/cpu/armv7/omap-common/emif-common.c
@@ -33,6 +33,8 @@
#include <asm/utils.h>
#include <linux/compiler.h>
+static int emif1_enabled = -1, emif2_enabled = -1;
+
void set_lpmode_selfrefresh(u32 base)
{
struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
@@ -1109,6 +1111,7 @@ void emif_post_init_config(u32 base)
void dmm_init(u32 base)
{
const struct dmm_lisa_map_regs *lisa_map_regs;
+ u32 i, section, valid;
#ifdef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
emif_get_dmm_regs(&lisa_map_regs);
@@ -1216,6 +1219,29 @@ void dmm_init(u32 base)
writel(lisa_map_regs->dmm_lisa_map_0,
&hw_lisa_map_regs->dmm_lisa_map_0);
}
+
+ /*
+ * EMIF should be configured only when
+ * memory is mapped on it. Using emif1_enabled
+ * and emif2_enabled variables for this.
+ */
+ emif1_enabled = 0;
+ emif2_enabled = 0;
+ for (i = 0; i < 4; i++) {
+ section = __raw_readl(DMM_BASE + i*4);
+ valid = (section & EMIF_SDRC_MAP_MASK) >>
+ (EMIF_SDRC_MAP_SHIFT);
+ if (valid == 3) {
+ emif1_enabled = 1;
+ emif2_enabled = 1;
+ break;
+ } else if (valid == 1) {
+ emif1_enabled = 1;
+ } else if (valid == 2) {
+ emif2_enabled = 1;
+ }
+ }
+
}
/*
@@ -1255,15 +1281,20 @@ void sdram_init(void)
writel(CM_DLL_CTRL_NO_OVERRIDE, &prcm->cm_dll_ctrl);
}
- do_sdram_init(EMIF1_BASE);
- do_sdram_init(EMIF2_BASE);
-
if (!in_sdram)
dmm_init(DMM_BASE);
+ if (emif1_enabled)
+ do_sdram_init(EMIF1_BASE);
+
+ if (emif2_enabled)
+ do_sdram_init(EMIF2_BASE);
+
if (!(in_sdram || warm_reset())) {
- emif_post_init_config(EMIF1_BASE);
- emif_post_init_config(EMIF2_BASE);
+ if (emif1_enabled)
+ emif_post_init_config(EMIF1_BASE);
+ if (emif2_enabled)
+ emif_post_init_config(EMIF2_BASE);
}
/* for the shadow registers to take effect */