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Diffstat (limited to 'arch/arm/mach-omap2/sdrc.c')
-rw-r--r--arch/arm/mach-omap2/sdrc.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/arch/arm/mach-omap2/sdrc.c b/arch/arm/mach-omap2/sdrc.c
index 2a30060cb4b..2045441e838 100644
--- a/arch/arm/mach-omap2/sdrc.c
+++ b/arch/arm/mach-omap2/sdrc.c
@@ -37,6 +37,10 @@ static struct omap_sdrc_params *sdrc_init_params;
void __iomem *omap2_sdrc_base;
void __iomem *omap2_sms_base;
+/* SDRC_POWER register bits */
+#define SDRC_POWER_EXTCLKDIS_SHIFT 3
+#define SDRC_POWER_PWDENA_SHIFT 2
+#define SDRC_POWER_PAGEPOLICY_SHIFT 0
/**
* omap2_sdrc_get_params - return SDRC register values for a given clock rate
@@ -56,9 +60,12 @@ struct omap_sdrc_params *omap2_sdrc_get_params(unsigned long r)
{
struct omap_sdrc_params *sp;
+ if (!sdrc_init_params)
+ return NULL;
+
sp = sdrc_init_params;
- while (sp->rate != r)
+ while (sp->rate && sp->rate != r)
sp++;
if (!sp->rate)
@@ -74,7 +81,14 @@ void __init omap2_set_globals_sdrc(struct omap_globals *omap2_globals)
omap2_sms_base = omap2_globals->sms;
}
-/* turn on smart idle modes for SDRAM scheduler and controller */
+/**
+ * omap2_sdrc_init - initialize SMS, SDRC devices on boot
+ * @sp: pointer to a null-terminated list of struct omap_sdrc_params
+ *
+ * Turn on smart idle modes for SDRAM scheduler and controller.
+ * Program a known-good configuration for the SDRC to deal with buggy
+ * bootloaders.
+ */
void __init omap2_sdrc_init(struct omap_sdrc_params *sp)
{
u32 l;
@@ -90,4 +104,10 @@ void __init omap2_sdrc_init(struct omap_sdrc_params *sp)
sdrc_write_reg(l, SDRC_SYSCONFIG);
sdrc_init_params = sp;
+
+ /* XXX Enable SRFRONIDLEREQ here also? */
+ l = (1 << SDRC_POWER_EXTCLKDIS_SHIFT) |
+ (1 << SDRC_POWER_PWDENA_SHIFT) |
+ (1 << SDRC_POWER_PAGEPOLICY_SHIFT);
+ sdrc_write_reg(l, SDRC_POWER);
}