powerpc/mpc86xx: Disable translation for BAT setup

[karo-tx-uboot.git] / arch / powerpc / cpu / mpc86xx / start.S

diff --git a/arch/powerpc/cpu/mpc86xx/start.S b/arch/powerpc/cpu/mpc86xx/start.S
index 32896d49e1a82a57715a3eca8bc61bef1a9c96b7..ef80ecf6e53801c31ecc3e31cb063925e9d2876c 100644 (file)
--- a/arch/powerpc/cpu/mpc86xx/start.S
+++ b/arch/powerpc/cpu/mpc86xx/start.S
@@ -1,5 +1,5 @@
 /*
- * Copyright 2004, 2007 Freescale Semiconductor.
+ * Copyright 2004, 2007, 2011 Freescale Semiconductor.
  * Srikanth Srinivasan <srikanth.srinivaan@freescale.com>
  *
  * See file CREDITS for list of people who contributed to this
@@ -322,6 +322,73 @@ invalidate_bats:
        sync
        blr
 
+#define CONFIG_BAT_PAIR(n) \
+       lis     r4, CONFIG_SYS_IBAT##n##L@h;            \
+       ori     r4, r4, CONFIG_SYS_IBAT##n##L@l;        \
+       lis     r3, CONFIG_SYS_IBAT##n##U@h;            \
+       ori     r3, r3, CONFIG_SYS_IBAT##n##U@l;        \
+       mtspr   IBAT##n##L, r4;                         \
+       mtspr   IBAT##n##U, r3;                         \
+       lis     r4, CONFIG_SYS_DBAT##n##L@h;            \
+       ori     r4, r4, CONFIG_SYS_DBAT##n##L@l;        \
+       lis     r3, CONFIG_SYS_DBAT##n##U@h;            \
+       ori     r3, r3, CONFIG_SYS_DBAT##n##U@l;        \
+       mtspr   DBAT##n##L, r4;                         \
+       mtspr   DBAT##n##U, r3;
+
+/*
+ * setup_bats:
+ *
+ * Set up the final BAT registers now that setup is done.
+ *
+ * Assumes that:
+ *     1) Address translation is enabled upon entry
+ *     2) The boot rom is still accessible via 1:1 translation
+ */
+       .globl setup_bats
+setup_bats:
+       mflr    r5
+       sync
+
+       /*
+        * When we disable address translation, we will get 1:1 (VA==PA)
+        * translation.  The only place we know for sure is safe for that is
+        * the bootrom where we originally started out.  Pop back into there.
+        */
+       lis     r4, CONFIG_SYS_MONITOR_BASE_EARLY@h
+       ori     r4, r4, CONFIG_SYS_MONITOR_BASE_EARLY@l
+       addi    r4, r4, trans_disabled - _start + EXC_OFF_SYS_RESET
+
+       /* disable address translation */
+       mfmsr   r3
+       rlwinm  r3, r3, 0, 28, 25
+       mtspr   SRR0, r4
+       mtspr   SRR1, r3
+       rfi
+
+trans_disabled:
+#if defined(CONFIG_SYS_DBAT0U) && defined(CONFIG_SYS_DBAT0L) \
+       && defined(CONFIG_SYS_IBAT0U) && defined(CONFIG_SYS_IBAT0L)
+       CONFIG_BAT_PAIR(0)
+#endif
+       CONFIG_BAT_PAIR(1)
+       CONFIG_BAT_PAIR(2)
+       CONFIG_BAT_PAIR(3)
+       CONFIG_BAT_PAIR(4)
+       CONFIG_BAT_PAIR(5)
+       CONFIG_BAT_PAIR(6)
+       CONFIG_BAT_PAIR(7)
+
+       sync
+       isync
+
+       /* Turn translation back on and return */
+       mfmsr   r3
+       ori     r3, r3, (MSR_IR | MSR_DR)
+       mtspr   SPRN_SRR0,r5
+       mtspr   SPRN_SRR1,r3
+       rfi
+
 /*
  * early_bats:
  *