ARM: OMAP: SMS: save/restore of SMS_SYSCONFIG for off-mode

[~andy/linux] / arch / arm / mach-omap2 / sdrc.c

diff --git a/arch/arm/mach-omap2/sdrc.c b/arch/arm/mach-omap2/sdrc.c
index 07000de48f34cc5db8a3594fc3d97e80bb91f98c..9a592199321c5330237faf303500149356604270 100644 (file)
--- a/arch/arm/mach-omap2/sdrc.c
+++ b/arch/arm/mach-omap2/sdrc.c
@@ -37,11 +37,37 @@ static struct omap_sdrc_params *sdrc_init_params_cs0, *sdrc_init_params_cs1;
 void __iomem *omap2_sdrc_base;
 void __iomem *omap2_sms_base;
 
+struct omap2_sms_regs {
+       u32     sms_sysconfig;
+};
+
+static struct omap2_sms_regs sms_context;
+
 /* SDRC_POWER register bits */
 #define SDRC_POWER_EXTCLKDIS_SHIFT             3
 #define SDRC_POWER_PWDENA_SHIFT                        2
 #define SDRC_POWER_PAGEPOLICY_SHIFT            0
 
+/**
+ * omap2_sms_save_context - Save SMS registers
+ *
+ * Save SMS registers that need to be restored after off mode.
+ */
+void omap2_sms_save_context(void)
+{
+       sms_context.sms_sysconfig = sms_read_reg(SMS_SYSCONFIG);
+}
+
+/**
+ * omap2_sms_restore_context - Restore SMS registers
+ *
+ * Restore SMS registers that need to be Restored after off mode.
+ */
+void omap2_sms_restore_context(void)
+{
+       sms_write_reg(sms_context.sms_sysconfig, SMS_SYSCONFIG);
+}
+
 /**
  * omap2_sdrc_get_params - return SDRC register values for a given clock rate
  * @r: SDRC clock rate (in Hz)
@@ -132,4 +158,5 @@ void __init omap2_sdrc_init(struct omap_sdrc_params *sdrc_cs0,
        l = (1 << SDRC_POWER_EXTCLKDIS_SHIFT) |
                (1 << SDRC_POWER_PAGEPOLICY_SHIFT);
        sdrc_write_reg(l, SDRC_POWER);
+       omap2_sms_save_context();
 }