[U-Boot] [PATCH] powerpc/t4240: work around errata A-005977

[Chunhe Lan]

The PCI Express internal transmit and receive buffers are ECC protected.
When these buffers are being read before they are written, a false
multi-bit ECC error is likely to occur. So disable the PCI Express ECC
error reporting.

The Workaround is for the T4 silicon rev 1.0.

Signed-off-by: Chunhe Lan <Chunhe.Lan at freescale.com>
---
 arch/powerpc/cpu/mpc85xx/cmd_errata.c     |    4 ++++
 arch/powerpc/cpu/mpc85xx/cpu_init.c       |    8 ++++++++
 arch/powerpc/include/asm/config_mpc85xx.h |    2 ++
 3 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index 0711064..7489174 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -270,6 +270,10 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 #ifdef CONFIG_SYS_FSL_ERRATUM_A005553
 	puts("Work-around for Erratum A005553 enabled\n");
 #endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_A005977
+	if (IS_SVR_REV(svr, 1, 0))
+		puts("Work-around for Erratum A005977 enabled\n");
+#endif
 #ifdef CONFIG_SYS_FSL_ERRATUM_A004849
 	/* This work-around is implemented in PBI, so just check for it */
 	check_erratum_a4849(svr);
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index 6f7a10f..0b6668b 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -675,6 +675,14 @@ skip_l2:
 	setbits_be32((void *)DCFG_ECC, 1 << (31 - 15));
 #endif
 
+#ifdef CONFIG_SYS_FSL_ERRATUM_A005977
+	if (IS_SVR_REV(svr, 1, 0)) {
+		void *p;
+		p = (void *)CONFIG_SYS_DCSRBAR + 0x20520;
+		setbits_be32(p, 0xf << (31 - 15));
+	}
+#endif
+
 #ifdef CONFIG_FMAN_ENET
 	fman_enet_init();
 #endif
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index 650df14..bc619e9 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -540,6 +540,7 @@
 #define CONFIG_SYS_FSL_ERRATUM_A004809
 #define CONFIG_SYS_FSL_ERRATUM_A004857
 #define CONFIG_SYS_FSL_ERRATUM_A005553
+#define CONFIG_SYS_FSL_ERRATUM_A005977
 #define CONFIG_SYS_FSL_ERRATUM_A004390
 #define CONFIG_SYS_CCSRBAR_DEFAULT	0xfe000000
 #define CONFIG_SYS_FSL_PCI_VER_3_X
@@ -583,6 +584,7 @@
 #define CONFIG_SYS_FSL_ERRATUM_A004809
 #define CONFIG_SYS_FSL_ERRATUM_A004857
 #define CONFIG_SYS_FSL_ERRATUM_A005553
+#define CONFIG_SYS_FSL_ERRATUM_A005977
 #define CONFIG_SYS_CCSRBAR_DEFAULT	0xfe000000
 #define CONFIG_SYS_FSL_PCI_VER_3_X
 
-- 
1.7.6.5