[U-Boot] [PATCH 1/4] powerpc/P4080: Check SVR for CPU22 workaround

[York Sun]

Workaround for erratum CPU22 applies to P4080 rev 1 and rev 2 only.

Signed-off-by: York Sun <yorksun at freescale.com>
---
 arch/powerpc/cpu/mpc85xx/cmd_errata.c |    3 ++-
 arch/powerpc/cpu/mpc85xx/cpu_init.c   |    8 +++++---
 arch/powerpc/cpu/mpc85xx/release.S    |    8 ++++++++
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index 2ed5a98..d7a62e9 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -51,7 +51,8 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	puts("Work-around for Erratum SERDES-A005 enabled\n");
 #endif
 #if defined(CONFIG_SYS_P4080_ERRATUM_CPU22)
-	puts("Work-around for Erratum CPU22 enabled\n");
+	if (SVR_MAJ(svr) < 3)
+		puts("Work-around for Erratum CPU22 enabled\n");
 #endif
 #if defined(CONFIG_SYS_FSL_ERRATUM_CPU_A003999)
 	puts("Work-around for Erratum CPU-A003999 enabled\n");
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index 2cd5db7..3637972 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -309,9 +309,11 @@ int cpu_init_r(void)
 #endif
 
 #if defined(CONFIG_SYS_P4080_ERRATUM_CPU22)
-	flush_dcache();
-	mtspr(L1CSR2, (mfspr(L1CSR2) | L1CSR2_DCWS));
-	sync();
+	if (SVR_MAJ(svr) < 3) {
+		flush_dcache();
+		mtspr(L1CSR2, (mfspr(L1CSR2) | L1CSR2_DCWS));
+		sync();
+	}
 #endif
 
 	puts ("L2:    ");
diff --git a/arch/powerpc/cpu/mpc85xx/release.S b/arch/powerpc/cpu/mpc85xx/release.S
index c81e19c..fe3b6d6 100644
--- a/arch/powerpc/cpu/mpc85xx/release.S
+++ b/arch/powerpc/cpu/mpc85xx/release.S
@@ -144,9 +144,17 @@ __secondary_start_page:
 #endif
 
 #if defined(CONFIG_SYS_P4080_ERRATUM_CPU22)
+	/* apply to P4080 rev 1 and rev 2 */
+	mfspr   r3,SPRN_SVR
+	rlwinm  r3,r3,0,0xf0
+	li      r4,0x30
+	cmpw    r3,r4
+	bge     2f
+
 	mfspr	r8,L1CSR2
 	oris	r8,r8,(L1CSR2_DCWS)@h
 	mtspr	L1CSR2,r8
+2:
 #endif
 
 #ifdef CONFIG_BACKSIDE_L2_CACHE
-- 
1.7.0.4