fsl-ddr: Fix handling of >4G of memory when !CONFIG_PHYS_64BIT

The ddr code computes most things as 64-bit quantities and had some places
in the middle that it was using phy_addr_t and phys_size_t.

Instead we use unsigned long long through out and only at the last stage of
setting the LAWs and reporting the amount of memory to the board code do we
truncate down to what we can cover via phys_size_t.

This has the added benefit that the DDR controller itself is always setup
the same way regardless of how much memory we have.  Its only the LAW
setup that limits what is visible to the system.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 21 insertions, 24 deletions

diff --git a/cpu/mpc8xxx/ddr/main.c b/cpu/mpc8xxx/ddr/main.c
index 305f7fb..6dae26b 100644
--- a/cpu/mpc8xxx/ddr/main.c
+++ b/cpu/mpc8xxx/ddr/main.c
@@ -215,9 +215,7 @@ int step_assign_addresses(fsl_ddr_info_t *pinfo,
 	}
 
 	if (*memctl_interleaving) {
-		phys_addr_t addr;
-		phys_size_t total_mem_per_ctlr = 0;
-
+		unsigned long long addr, total_mem_per_ctlr = 0;
 		/*
 		 * If interleaving between memory controllers,
 		 * make each controller start at a base address
@@ -235,14 +233,13 @@ int step_assign_addresses(fsl_ddr_info_t *pinfo,
 
 		for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 			addr = 0;
-			pinfo->common_timing_params[i].base_address =
-						(phys_addr_t)addr;
+			pinfo->common_timing_params[i].base_address = 0ull;
 			for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
 				unsigned long long cap
 					= pinfo->dimm_params[i][j].capacity;
 
 				pinfo->dimm_params[i][j].base_address = addr;
-				addr += (phys_addr_t)(cap >> dbw_cap_adj[i]);
+				addr += cap >> dbw_cap_adj[i];
 				total_mem_per_ctlr += cap >> dbw_cap_adj[i];
 			}
 		}
@@ -252,18 +249,17 @@ int step_assign_addresses(fsl_ddr_info_t *pinfo,
 		 * Simple linear assignment if memory
 		 * controllers are not interleaved.
 		 */
-		phys_size_t cur_memsize = 0;
+		unsigned long long cur_memsize = 0;
 		for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
-			phys_size_t total_mem_per_ctlr = 0;
+			u64 total_mem_per_ctlr = 0;
 			pinfo->common_timing_params[i].base_address =
-						(phys_addr_t)cur_memsize;
+						cur_memsize;
 			for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
 				/* Compute DIMM base addresses. */
 				unsigned long long cap =
 					pinfo->dimm_params[i][j].capacity;
-
 				pinfo->dimm_params[i][j].base_address =
-					(phys_addr_t)cur_memsize;
+					cur_memsize;
 				cur_memsize += cap >> dbw_cap_adj[i];
 				total_mem_per_ctlr += cap >> dbw_cap_adj[i];
 			}
@@ -275,13 +271,13 @@ int step_assign_addresses(fsl_ddr_info_t *pinfo,
 	return 0;
 }
 
-phys_size_t
+unsigned long long
 fsl_ddr_compute(fsl_ddr_info_t *pinfo, unsigned int start_step)
 {
 	unsigned int i, j;
 	unsigned int all_controllers_memctl_interleaving = 0;
 	unsigned int all_controllers_rank_interleaving = 0;
-	phys_size_t total_mem = 0;
+	unsigned long long total_mem = 0;
 
 	fsl_ddr_cfg_regs_t *ddr_reg = pinfo->fsl_ddr_config_reg;
 	common_timing_params_t *timing_params = pinfo->common_timing_params;
@@ -424,15 +420,6 @@ fsl_ddr_compute(fsl_ddr_info_t *pinfo, unsigned int start_step)
 			}
 		}
 
-#if !defined(CONFIG_PHYS_64BIT)
-		/* Check for 4G or more with a 32-bit phys_addr_t.  Bad. */
-		if (max_end >= 0xff) {
-			printf("This U-Boot only supports < 4G of DDR\n");
-			printf("You could rebuild it with CONFIG_PHYS_64BIT\n");
-			return CONFIG_MAX_MEM_MAPPED;
-		}
-#endif
-
 		total_mem = 1 + (((unsigned long long)max_end << 24ULL)
 				    | 0xFFFFFFULL);
 	}
@@ -450,7 +437,7 @@ phys_size_t fsl_ddr_sdram(void)
 {
 	unsigned int i;
 	unsigned int memctl_interleaved;
-	phys_size_t total_memory;
+	unsigned long long total_memory;
 	fsl_ddr_info_t info;
 
 	/* Reset info structure. */
@@ -515,7 +502,17 @@ phys_size_t fsl_ddr_sdram(void)
 		}
 	}
 
-	debug("total_memory = %llu\n", (u64)total_memory);
+	debug("total_memory = %llu\n", total_memory);
+
+#if !defined(CONFIG_PHYS_64BIT)
+	/* Check for 4G or more.  Bad. */
+	if (total_memory >= (1ull << 32)) {
+		printf("Detected %lld MB of memory\n", total_memory >> 20);
+		printf("This U-Boot only supports < 4G of DDR\n");
+		printf("You could rebuild it with CONFIG_PHYS_64BIT\n");
+		total_memory = CONFIG_MAX_MEM_MAPPED;
+	}
+#endif
 
 	return total_memory;
 }