Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6

[mv-sheeva.git] / arch / arm / mach-omap2 / sdrc.c

diff --git a/arch/arm/mach-omap2/sdrc.c b/arch/arm/mach-omap2/sdrc.c
index 2a30060cb4b78ec897bb668b31c665c26c160827..2045441e8385987967eb02b7f6045c503dc94b1d 100644 (file)
--- 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);
 }