+#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_RTC_DDR_SUPPORT)
+/*
+ * Check if we are executing rtc-only + DDR mode, and resume from it if needed
+ */
+static void rtc_only(void)
+{
+ struct davinci_rtc *rtc = (struct davinci_rtc *)RTC_BASE;
+ struct prm_device_inst *prm_device =
+ (struct prm_device_inst *)PRM_DEVICE_INST;
+
+ u32 scratch1, sdrc;
+ void (*resume_func)(void);
+
+ scratch1 = readl(&rtc->scratch1);
+
+ /*
+ * Check RTC scratch against RTC_MAGIC_VAL, RTC_MAGIC_VAL is only
+ * written to this register when we want to wake up from RTC only
+ * with DDR in self-refresh mode. Contents of the RTC_SCRATCH1:
+ * bits 0-15: RTC_MAGIC_VAL
+ * bits 16-31: board type (needed for sdram_init)
+ */
+ if ((scratch1 & 0xffff) != RTC_MAGIC_VAL)
+ return;
+
+ rtc32k_unlock(rtc);
+
+ /* Clear RTC magic */
+ writel(0, &rtc->scratch1);
+
+ /*
+ * Update board type based on value stored on RTC_SCRATCH1, this
+ * is done so that we don't need to read the board type from eeprom
+ * over i2c bus which is expensive
+ */
+ rtc_only_update_board_type(scratch1 >> RTC_BOARD_TYPE_SHIFT);
+
+ /*
+ * Enable EMIF_DEVOFF in PRCM_PRM_EMIF_CTRL to indicate to EMIF we
+ * are resuming from self-refresh. This avoids an unnecessary re-init
+ * of the DDR. The re-init takes time and we would need to wait for
+ * it to complete before accessing DDR to avoid L3 NOC errors.
+ */
+ writel(EMIF_CTRL_DEVOFF, &prm_device->emif_ctrl);
+
+ rtc_only_prcm_init();
+ sdram_init();
+
+ /* Check EMIF4D_SDRAM_CONFIG[31:29] SDRAM_TYPE */
+ /* Only perform leveling if SDRAM_TYPE = 3 (DDR3) */
+ sdrc = readl(AM43XX_EMIF_BASE + AM43XX_SDRAM_CONFIG_OFFSET);
+
+ sdrc &= AM43XX_SDRAM_TYPE_MASK;
+ sdrc >>= AM43XX_SDRAM_TYPE_SHIFT;
+
+ if (sdrc == AM43XX_SDRAM_TYPE_DDR3) {
+ writel(AM43XX_RDWRLVLFULL_START,
+ AM43XX_EMIF_BASE +
+ AM43XX_READ_WRITE_LEVELING_CTRL_OFFSET);
+ mdelay(1);
+
+am43xx_wait:
+ sdrc = readl(AM43XX_EMIF_BASE +
+ AM43XX_READ_WRITE_LEVELING_CTRL_OFFSET);
+ if (sdrc == AM43XX_RDWRLVLFULL_START)
+ goto am43xx_wait;
+ }
+
+ resume_func = (void *)readl(&rtc->scratch0);
+ if (resume_func)
+ resume_func();
+}
+#endif
+