Driver/ddr: Add support of different DDR base address

DDR base address has been the same from the view of core and DDR
controllers. This has changed for Freescale ARM-based SoCs. Controllers
setup DDR memory in a contiguous space and cores view it at separated
locations.

Signed-off-by: York Sun <yorksun@freescale.com>

2 files changed, 19 insertions, 2 deletions

diff --git a/README b/README
index 413d682..355e898 100644
--- a/README
+++ b/README
@@ -492,6 +492,11 @@ The following options need to be configured:
 		CONFIG_SYS_FSL_DDR_LE
 		Defines the DDR controller register space as Little Endian
 
+		CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY
+		Physical address from the view of DDR controllers. It is the
+		same as CONFIG_SYS_DDR_SDRAM_BASE for  all Power SoCs. But
+		it could be different for ARM SoCs.
+
 - Intel Monahans options:
 		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
 
diff --git a/drivers/ddr/fsl/main.c b/drivers/ddr/fsl/main.c
index d0cd589..dee50a0 100644
--- a/drivers/ddr/fsl/main.c
+++ b/drivers/ddr/fsl/main.c
@@ -17,6 +17,18 @@
 #include <fsl_ddr_sdram.h>
 #include <fsl_ddr.h>
 
+/*
+ * CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY is the physical address from the view
+ * of DDR controllers. It is the same as CONFIG_SYS_DDR_SDRAM_BASE for
+ * all Power SoCs. But it could be different for ARM SoCs. For example,
+ * fsl_lsch3 has a mapping mechanism to map DDR memory to ranges (in order) of
+ * 0x00_8000_0000 ~ 0x00_ffff_ffff
+ * 0x80_8000_0000 ~ 0xff_ffff_ffff
+ */
+#ifndef CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY
+#define CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY CONFIG_SYS_DDR_SDRAM_BASE
+#endif
+
 #ifdef CONFIG_PPC
 #include <asm/fsl_law.h>
 
@@ -255,7 +267,7 @@ static unsigned long long __step_assign_addresses(fsl_ddr_info_t *pinfo,
 		debug("dbw_cap_adj[%d]=%d\n", i, dbw_cap_adj[i]);
 	}
 
-	current_mem_base = CONFIG_SYS_DDR_SDRAM_BASE;
+	current_mem_base = CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY;
 	total_mem = 0;
 	if (pinfo->memctl_opts[0].memctl_interleaving) {
 		rank_density = pinfo->dimm_params[0][0].rank_density >>
@@ -536,7 +548,7 @@ fsl_ddr_compute(fsl_ddr_info_t *pinfo, unsigned int start_step,
 		}
 
 		total_mem = 1 + (((unsigned long long)max_end << 24ULL) |
-			    0xFFFFFFULL) - CONFIG_SYS_DDR_SDRAM_BASE;
+			    0xFFFFFFULL) - CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY;
 	}
 
 	return total_mem;