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| author | York Sun <yorksun@freescale.com> | 2013-06-25 11:37:49 -0700 |
|---|---|---|
| committer | York Sun <yorksun@freescale.com> | 2013-08-09 12:41:40 -0700 |
| commit | d217a9ad01ee6557a0c47cfc745eef6890507bbb (patch) | |
| tree | 7905c863e594930b7115b2e6d78a821f6205c79a /arch/powerpc/cpu | |
| parent | c63e137014cf148bc1d234128941dccee3d519ae (diff) | |
| download | u-boot-imx-d217a9ad01ee6557a0c47cfc745eef6890507bbb.zip u-boot-imx-d217a9ad01ee6557a0c47cfc745eef6890507bbb.tar.gz u-boot-imx-d217a9ad01ee6557a0c47cfc745eef6890507bbb.tar.bz2 | |
powerpc/mpc85xx: Workaround for A-005812
Erratum A-005812 Incorrect reservation clearing in Write Shadow mode can
result in invalid atomic operations. For u-boot, this erratum only impacts
SoCs running in write shadow mode.
Signed-off-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'arch/powerpc/cpu')
| -rw-r--r-- | arch/powerpc/cpu/mpc85xx/cmd_errata.c | 3 | ||||
| -rw-r--r-- | arch/powerpc/cpu/mpc85xx/cpu_init.c | 8 | ||||
| -rw-r--r-- | arch/powerpc/cpu/mpc85xx/release.S | 15 |
3 files changed, 26 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c index 5cd02cc..cbb443f 100644 --- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c +++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c @@ -245,6 +245,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) #ifdef CONFIG_SYS_FSL_ERRATUM_A006593 puts("Work-around for Erratum A006593 enabled\n"); #endif +#ifdef CONFIG_SYS_FSL_ERRATUM_A005812 + puts("Work-around for Erratum A-005812 enabled\n"); +#endif return 0; } diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c index 1774462..48b3826 100644 --- a/arch/powerpc/cpu/mpc85xx/cpu_init.c +++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c @@ -399,6 +399,14 @@ int cpu_init_r(void) sync(); } #endif +#ifdef CONFIG_SYS_FSL_ERRATUM_A005812 + /* + * A-005812 workaround sets bit 32 of SPR 976 for SoCs running + * in write shadow mode. Checking DCWS before setting SPR 976. + */ + if (mfspr(L1CSR2) & L1CSR2_DCWS) + mtspr(SPRN_HDBCR0, (mfspr(SPRN_HDBCR0) | 0x80000000)); +#endif #if defined(CONFIG_PPC_SPINTABLE_COMPATIBLE) && defined(CONFIG_MP) spin = getenv("spin_table_compat"); diff --git a/arch/powerpc/cpu/mpc85xx/release.S b/arch/powerpc/cpu/mpc85xx/release.S index 15bbbc1..c15e83b 100644 --- a/arch/powerpc/cpu/mpc85xx/release.S +++ b/arch/powerpc/cpu/mpc85xx/release.S @@ -226,6 +226,21 @@ __secondary_start_page: 2: #endif +#ifdef CONFIG_SYS_FSL_ERRATUM_A005812 + /* + * A-005812 workaround sets bit 32 of SPR 976 for SoCs running in + * write shadow mode. This code should run after other code setting + * DCWS. + */ + mfspr r3,L1CSR2 + andis. r3,r3,(L1CSR2_DCWS)@h + beq 1f + mfspr r3, SPRN_HDBCR0 + oris r3, r3, 0x8000 + mtspr SPRN_HDBCR0, r3 +1: +#endif + #ifdef CONFIG_BACKSIDE_L2_CACHE /* skip L2 setup on P2040/P2040E as they have no L2 */ mfspr r3,SPRN_SVR |