[U-Boot] [PATCH] powerpc/t2080: CPU erratum A-007907

[Darwin Dingel]

Core hang occurs when using L1 stashes. Workaround is to disable L1
stashes so software uses L2 cache for stashes instead.

Reviewed-by: Chris Packham <chris.packham at alliedtelesis.co.nz>
Cc: York Sun <york.sun at nxp.com>
---
 arch/powerpc/cpu/mpc85xx/cmd_errata.c     | 4 +++-
 arch/powerpc/cpu/mpc85xx/cpu_init.c       | 7 +++++++
 arch/powerpc/include/asm/config_mpc85xx.h | 1 +
 arch/powerpc/include/asm/processor.h      | 1 +
 4 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index 3b06ae4..197eb2f 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -329,7 +329,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 #ifdef CONFIG_SYS_FSL_ERRATUM_A009663
 	puts("Work-around for Erratum A009663 enabled\n");
 #endif
-
+#ifdef CONFIG_SYS_FSL_ERRATUM_A007907
+	puts("Work-around for Erratum A007907 enabled\n");
+#endif
 	return 0;
 }
 
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index 53b3729..0e744f0 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -775,6 +775,13 @@ int cpu_init_r(void)
 		sync();
 	}
 #endif
+
+#ifdef CONFIG_SYS_FSL_ERRATUM_A007907
+	flush_dcache();
+	mtspr(L1CSR2, (mfspr(L1CSR2) & ~L1CSR2_DCSTASHID));
+	sync();
+#endif
+ 
 #ifdef CONFIG_SYS_FSL_ERRATUM_A005812
 	/*
 	 * A-005812 workaround sets bit 32 of SPR 976 for SoCs running
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index 6d845e8..3d0ce2e 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -910,6 +910,7 @@ defined(CONFIG_PPC_T1014) || defined(CONFIG_PPC_T1013)
 #define CONFIG_SYS_FSL_ERRATUM_A006593
 #define CONFIG_SYS_FSL_ERRATUM_A007186
 #define CONFIG_SYS_FSL_ERRATUM_A006379
+#define CONFIG_SYS_FSL_ERRATUM_A007907
 #define ESDHCI_QUIRK_BROKEN_TIMEOUT_VALUE
 #define CONFIG_SYS_FSL_SFP_VER_3_0
 
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index fdfca90..6f9b297 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -501,6 +501,7 @@
 #define   L1CSR1_ICE		0x00000001	/* Instruction Cache Enable */
 #define SPRN_L1CSR2	0x25e	/* L1 Data Cache Control and Status Register 2 */
 #define   L1CSR2_DCWS		0x40000000	/* Data Cache Write Shadow */
+#define   L1CSR2_DCSTASHID  0x000003ff	/* Data Cache Stash ID */
 #define SPRN_L2CSR0	0x3f9	/* L2 Data Cache Control and Status Register 0 */
 #define   L2CSR0_L2E		0x80000000	/* L2 Cache Enable */
 #define   L2CSR0_L2PE		0x40000000	/* L2 Cache Parity/ECC Enable */
-- 
2.10.1