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powerpc: mpc85xx: Implemente workaround for CPU erratum A-007907

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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@alliedtelesis.co.nz>
Signed-off-by: Darwin Dingel <darwin.dingel@alliedtelesis.co.nz>
Cc: York Sun <york.sun@nxp.com>
[York S: Move SYS_FSL_ERRATUM_A007907 to Kconfig]
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
Darwin Dingel 2016-10-25 09:48:01 +13:00 committed by York Sun
parent 0c9e85f67c
commit 06ad970b53
4 changed files with 17 additions and 1 deletions
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6
arch/powerpc/cpu/mpc85xx/Kconfig
View file

@ -365,6 +365,7 @@ config ARCH_B4860
select SYS_FSL_ERRATUM_A007075
select SYS_FSL_ERRATUM_A007186
select SYS_FSL_ERRATUM_A007212
select SYS_FSL_ERRATUM_A007907
select SYS_FSL_ERRATUM_A009942
select SYS_FSL_HAS_DDR3
select SYS_FSL_HAS_SEC
@ -830,6 +831,7 @@ config ARCH_T2080
select SYS_FSL_ERRATUM_A006593
select SYS_FSL_ERRATUM_A007186
select SYS_FSL_ERRATUM_A007212
select SYS_FSL_ERRATUM_A007907
select SYS_FSL_ERRATUM_A009942
select SYS_FSL_ERRATUM_ESDHC111
select SYS_FSL_HAS_DDR3
@ -891,6 +893,7 @@ config ARCH_T4240
select SYS_FSL_ERRATUM_A006593
select SYS_FSL_ERRATUM_A007186
select SYS_FSL_ERRATUM_A007798
select SYS_FSL_ERRATUM_A007907
select SYS_FSL_ERRATUM_A009942
select SYS_FSL_HAS_DDR3
select SYS_FSL_HAS_SEC
@ -1081,6 +1084,9 @@ config SYS_FSL_ERRATUM_A007212
config SYS_FSL_ERRATUM_A007798
bool
config SYS_FSL_ERRATUM_A007907
bool
config SYS_FSL_ERRATUM_A008044
bool

4
arch/powerpc/cpu/mpc85xx/cmd_errata.c
View file

@ -330,7 +330,9 @@ 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;
}

7
arch/powerpc/cpu/mpc85xx/cpu_init.c
View file

@ -777,6 +777,13 @@ 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

1
arch/powerpc/include/asm/processor.h
View file

@ -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 */