ARM: at91: sam9g45: shutdown ddr1 too when rebooting

Like we are doing on DDR0 we need to cleanly shutdown DDR1 if it is
used before rebooting.
If DDR1 is not initialized, we check it and avoid dereferencing its address.
Even by adding two more instructions, we are able to complete the procedure
within a single cache line.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

diff --git a/arch/arm/mach-at91/at91sam9g45_reset.S b/arch/arm/mach-at91/at91sam9g45_reset.S
index 721a1a3..c40c1e2 100644 (file)
--- a/arch/arm/mach-at91/at91sam9g45_reset.S
+++ b/arch/arm/mach-at91/at91sam9g45_reset.S
@@ -16,11 +16,17 @@
 #include "at91_rstc.h"
                        .arm
 
+/*
+ * at91_ramc_base is an array void*
+ * init at NULL if only one DDR controler is present in or DT
+ */
                        .globl  at91sam9g45_restart
 
 at91sam9g45_restart:
                        ldr     r5, =at91_ramc_base             @ preload constants
                        ldr     r0, [r5]
+                       ldr     r5, [r5, #4]                    @ ddr1
+                       cmp     r5, #0
                        ldr     r4, =at91_rstc_base
                        ldr     r1, [r4]
 
@@ -30,6 +36,8 @@ at91sam9g45_restart:
 
                        .balign 32                              @ align to cache line
 
+                       strne   r2, [r5, #AT91_DDRSDRC_RTR]     @ disable DDR1 access
+                       strne   r3, [r5, #AT91_DDRSDRC_LPR]     @ power down DDR1
                        str     r2, [r0, #AT91_DDRSDRC_RTR]     @ disable DDR0 access
                        str     r3, [r0, #AT91_DDRSDRC_LPR]     @ power down DDR0
                        str     r4, [r1, #AT91_RSTC_CR]         @ reset processor