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omap: emif: configure emif only when required

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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>
This commit is contained in:
Lokesh Vutla 2012-11-15 21:06:33 +00:00 • committed by Tom Rini
parent c7f1cf5f29
commit 86021143a3
1 changed files with 36 additions and 5 deletions
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41
arch/arm/cpu/armv7/omap-common/emif-common.c
View file

@ -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 */