From 43f082bb7fc1c24b32a4abc693869c7d14d42829 Mon Sep 17 00:00:00 2001 From: Kumar Gala Date: Tue, 22 Nov 2011 06:51:15 -0600 Subject: [PATCH] powerpc/85xx: Add workaround for erratum CPU-A003999 Erratum A-003999: Running Floating Point instructions requires special initialization. Impact: Floating point arithmetic operations may result in an incorrect value. Workaround: Perform a read modify write to set bit 7 to a 1 in SPR 977 before executing any floating point arithmetic operation. This bit can be set when setting MSR[FP], and can be cleared when clearing MSR[FP]. Alternatively, the bit can be set once at boot time, and never cleared. There will be no performance degradation due to setting this bit. Signed-off-by: Kumar Gala --- arch/powerpc/cpu/mpc85xx/cmd_errata.c | 3 +++ arch/powerpc/cpu/mpc85xx/release.S | 6 ++++++ arch/powerpc/cpu/mpc85xx/start.S | 6 ++++++ arch/powerpc/include/asm/config_mpc85xx.h | 6 ++++++ 4 files changed, 21 insertions(+) diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c index 253bf08b6a..523f297035 100644 --- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c +++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c @@ -53,6 +53,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) #if defined(CONFIG_SYS_P4080_ERRATUM_CPU22) 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"); +#endif #if defined(CONFIG_SYS_FSL_ERRATUM_DDR_MSYNC_IN) puts("Work-around for DDR MSYNC_IN Erratum enabled\n"); #endif diff --git a/arch/powerpc/cpu/mpc85xx/release.S b/arch/powerpc/cpu/mpc85xx/release.S index 6678ed4118..c81e19c0e9 100644 --- a/arch/powerpc/cpu/mpc85xx/release.S +++ b/arch/powerpc/cpu/mpc85xx/release.S @@ -68,6 +68,12 @@ __secondary_start_page: mtspr SPRN_HID1,r3 #endif +#ifdef CONFIG_SYS_FSL_ERRATUM_CPU_A003999 + mfspr r3,977 + oris r3,r3,0x0100 + mtspr 977,r3 +#endif + /* Enable branch prediction */ lis r3,BUCSR_ENABLE@h ori r3,r3,BUCSR_ENABLE@l diff --git a/arch/powerpc/cpu/mpc85xx/start.S b/arch/powerpc/cpu/mpc85xx/start.S index 7bd5cc0b0f..4d37d6e863 100644 --- a/arch/powerpc/cpu/mpc85xx/start.S +++ b/arch/powerpc/cpu/mpc85xx/start.S @@ -253,6 +253,12 @@ l2_disabled: mtspr HID1,r0 #endif +#ifdef CONFIG_SYS_FSL_ERRATUM_CPU_A003999 + mfspr r3,977 + oris r3,r3,0x0100 + mtspr 977,r3 +#endif + /* Enable Branch Prediction */ #if defined(CONFIG_BTB) lis r0,BUCSR_ENABLE@h diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h index 981d639796..f1da82eba0 100644 --- a/arch/powerpc/include/asm/config_mpc85xx.h +++ b/arch/powerpc/include/asm/config_mpc85xx.h @@ -313,6 +313,7 @@ #define CONFIG_SYS_FSL_USB2_PHY_ENABLE #define CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY #define CONFIG_SYS_FSL_ERRATUM_ESDHC111 +#define CONFIG_SYS_FSL_ERRATUM_CPU_A003999 #elif defined(CONFIG_PPC_P2041) #define CONFIG_MAX_CPUS 4 @@ -331,6 +332,7 @@ #define CONFIG_SYS_FSL_USB2_PHY_ENABLE #define CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY #define CONFIG_SYS_FSL_ERRATUM_ESDHC111 +#define CONFIG_SYS_FSL_ERRATUM_CPU_A003999 #elif defined(CONFIG_PPC_P3041) #define CONFIG_MAX_CPUS 4 @@ -349,6 +351,7 @@ #define CONFIG_SYS_FSL_USB2_PHY_ENABLE #define CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY #define CONFIG_SYS_FSL_ERRATUM_ESDHC111 +#define CONFIG_SYS_FSL_ERRATUM_CPU_A003999 #elif defined(CONFIG_PPC_P3060) #define CONFIG_MAX_CPUS 8 @@ -364,6 +367,7 @@ #define CONFIG_SYS_FSL_PCIE_COMPAT "fsl,qoriq-pcie-v2.2" #define CONFIG_SYS_CCSRBAR_DEFAULT 0xfe000000 #define CONFIG_SYS_FSL_ERRATUM_DDR_A003 +#define CONFIG_SYS_FSL_ERRATUM_CPU_A003999 #elif defined(CONFIG_PPC_P4040) #define CONFIG_MAX_CPUS 4 @@ -374,6 +378,7 @@ #define CONFIG_SYS_FSL_TBCLK_DIV 16 #define CONFIG_SYS_FSL_PCIE_COMPAT "fsl,p4080-pcie" #define CONFIG_SYS_CCSRBAR_DEFAULT 0xfe000000 +#define CONFIG_SYS_FSL_ERRATUM_CPU_A003999 #elif defined(CONFIG_PPC_P4080) #define CONFIG_MAX_CPUS 8 @@ -402,6 +407,7 @@ #define CONFIG_SYS_P4080_ERRATUM_SERDES9 #define CONFIG_SYS_P4080_ERRATUM_SERDES_A001 #define CONFIG_SYS_P4080_ERRATUM_SERDES_A005 +#define CONFIG_SYS_FSL_ERRATUM_CPU_A003999 /* P5010 is single core version of P5020 */ #elif defined(CONFIG_PPC_P5010) -- 2.30.2