board/tqm85xx: Create and tear down TLB for get_ram_size()

We need a TLB entry to call get_ram_size(); the common code doesn't create
one until *after* fixed_sdram() has determined the size.  So we set up tlbs
for the max possible size and tear them down once we're done with
get_ram_size(); the common 85xx code will then set up a final set of tlb
entries for the *actual* detected size of ddr.

This prevents us from having TLB entries that are larger than DDR sitting
around for very long, which is not a recommended scenario.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/board/tqc/tqm85xx/sdram.c b/board/tqc/tqm85xx/sdram.c
index 39a9e2131..baf073e54 100644
--- a/board/tqc/tqm85xx/sdram.c
+++ b/board/tqc/tqm85xx/sdram.c
@@ -363,6 +363,12 @@ static phys_size_t sdram_setup(int casl)
 	udelay (1000);
 #endif /* CONFIG_TQM8548 */
 
+	/*
+	 * get_ram_size() depends on having tlbs for the DDR, but they are
+	 * not yet setup because we don't know the size.  Set up a temp
+	 * mapping and delete it when done.
+	 */
+	setup_ddr_tlbs(CONFIG_SYS_DDR_EARLY_SIZE_MB);
 	for (i = 0; i < N_DDR_CS_CONF; i++) {
 		ddr->cs0_config = ddr_cs_conf[i].reg;
 
@@ -376,6 +382,7 @@ static phys_size_t sdram_setup(int casl)
 			break;
 		}
 	}
+	clear_ddr_tlbs(CONFIG_SYS_DDR_EARLY_SIZE_MB);
 
 #ifdef CONFIG_TQM8548
 	if (i < N_DDR_CS_CONF) {