powerpc/85xx: Add the workaround for erratum ELBC-A001 (enable on P4080)

Simultaneous FCM and GPCM or UPM operation may erroneously trigger bus
monitor timeout.  Set timeout to maximum to avoid.

Based on a patch from Lan Chunhe <b25806@freescale.com>

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

diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index bf70d2d..7dfa596 100644 (file)
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -65,6 +65,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 #ifdef CONFIG_SYS_FSL_ERRATUM_CPC_A003
        puts("Work-around for Erratum CPC-A003 enabled\n");
 #endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_ELBC_A001
+       puts("Work-around for Erratum ELBC-A001 enabled\n");
+#endif
 
        return 0;
 }

diff --git a/arch/powerpc/cpu/mpc8xxx/fsl_lbc.c b/arch/powerpc/cpu/mpc8xxx/fsl_lbc.c
index 6f401e7..7598ebf 100644 (file)
--- a/arch/powerpc/cpu/mpc8xxx/fsl_lbc.c
+++ b/arch/powerpc/cpu/mpc8xxx/fsl_lbc.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010 Freescale Semiconductor, Inc.
+ * Copyright 2010-2011 Freescale Semiconductor, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -34,6 +34,11 @@ void init_early_memctl_regs(void)
 {
        uint init_br1 = 1;
 
+#ifdef CONFIG_SYS_FSL_ERRATUM_ELBC_A001
+       /* Set the local bus monitor timeout value to the maximum */
+       clrsetbits_be32(&(LBC_BASE_ADDR)->lbcr, LBCR_BMT|LBCR_BMTPS, 0xf);
+#endif
+
 #ifdef CONFIG_MPC85xx
        /* if cs1 is already set via debugger, leave cs0/cs1 alone */
        if (get_lbc_br(1) & BR_V)

diff --git a/arch/powerpc/include/asm/fsl_lbc.h b/arch/powerpc/include/asm/fsl_lbc.h
index c504732..8695a62 100644 (file)
--- a/arch/powerpc/include/asm/fsl_lbc.h
+++ b/arch/powerpc/include/asm/fsl_lbc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2004-2008,2010 Freescale Semiconductor, Inc.
+ * Copyright (C) 2004-2008,2010-2011 Freescale Semiconductor, Inc.
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -295,6 +295,8 @@ void lbc_sdram_init(void);
 #define LBCR_EPAR_SHIFT                        16
 #define LBCR_BMT                       0x0000FF00
 #define LBCR_BMT_SHIFT                 8
+#define LBCR_BMTPS                     0x0000000F
+#define LBCR_BMTPS_SHIFT               0
 
 /* LCRR - Clock Ratio Register
  */

diff --git a/include/configs/P4080DS.h b/include/configs/P4080DS.h
index c8f542e..5c818c9 100644 (file)
--- a/include/configs/P4080DS.h
+++ b/include/configs/P4080DS.h
@@ -43,5 +43,6 @@
 #define CONFIG_SYS_FSL_ERRATUM_CPC_A002
 #define CONFIG_SYS_FSL_ERRATUM_CPC_A003
 #define CONFIG_SYS_P4080_ERRATUM_SERDES8
+#define CONFIG_SYS_FSL_ERRATUM_ELBC_A001
 
 #include "corenet_ds.h"