powerpc/mpc85xx: Workaround for A-005812

[karo-tx-uboot.git] / arch / powerpc / cpu / mpc85xx / release.S

diff --git a/arch/powerpc/cpu/mpc85xx/release.S b/arch/powerpc/cpu/mpc85xx/release.S
index a4a21b037c6a076512134aa0809515a23f2b9c76..c15e83b521e613df5d0637c11bb7615b71ae8836 100644 (file)
--- a/arch/powerpc/cpu/mpc85xx/release.S
+++ b/arch/powerpc/cpu/mpc85xx/release.S
@@ -2,23 +2,7 @@
  * Copyright 2008-2012 Freescale Semiconductor, Inc.
  * Kumar Gala <kumar.gala@freescale.com>
  *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier:    GPL-2.0+
  */
 
 #include <asm-offsets.h>
@@ -242,6 +226,21 @@ __secondary_start_page:
 2:
 #endif
 
+#ifdef CONFIG_SYS_FSL_ERRATUM_A005812
+       /*
+        * A-005812 workaround sets bit 32 of SPR 976 for SoCs running in
+        * write shadow mode. This code should run after other code setting
+        * DCWS.
+        */
+       mfspr   r3,L1CSR2
+       andis.  r3,r3,(L1CSR2_DCWS)@h
+       beq     1f
+       mfspr   r3, SPRN_HDBCR0
+       oris    r3, r3, 0x8000
+       mtspr   SPRN_HDBCR0, r3
+1:
+#endif
+
 #ifdef CONFIG_BACKSIDE_L2_CACHE
        /* skip L2 setup on P2040/P2040E as they have no L2 */
        mfspr   r3,SPRN_SVR