Configuring DCSRCR to define the DCSR space to be 1G instead of the default 4M. DCSRCR only allows selection of either 4M or 1G. Most DCSR registers are within 4M but the Nexus trace buffer is located at offset 16M within the DCSR.
Configuring the LAW to be 32M to allow access to the Nexus trace buffer. No TLB modification is required since accessing the Nexus trace buffer from within u-boot is not required.
Signed-off-by: Stephen George stephen.george@freescale.com --- arch/powerpc/cpu/mpc85xx/cpu_init.c | 11 +++++++++++ arch/powerpc/include/asm/immap_85xx.h | 7 ++++++- board/freescale/corenet_ds/law.c | 3 ++- 3 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c index 6becd5b..36d5cf5 100644 --- a/arch/powerpc/cpu/mpc85xx/cpu_init.c +++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c @@ -223,6 +223,10 @@ static void corenet_tb_init(void) void cpu_init_f (void) { extern void m8560_cpm_reset (void); +#ifdef CONFIG_SYS_DCSRBAR_PHYS + ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR); +#endif + #ifdef CONFIG_MPC8548 ccsr_local_ecm_t *ecm = (void *)(CONFIG_SYS_MPC85xx_ECM_ADDR); uint svr = get_svr(); @@ -270,6 +274,13 @@ void cpu_init_f (void)
/* Invalidate the CPC before DDR gets enabled */ invalidate_cpc(); + + #ifdef CONFIG_SYS_DCSRBAR_PHYS + /* set DCSRCR so that DCSR space is 1G */ + setbits_be32(&gur->dcsrcr, FSL_CORENET_DCSR_SZ_1G); + in_be32(&gur->dcsrcr); +#endif + }
/* Implement a dummy function for those platforms w/o SERDES */ diff --git a/arch/powerpc/include/asm/immap_85xx.h b/arch/powerpc/include/asm/immap_85xx.h index abba9f5..398d9d2 100644 --- a/arch/powerpc/include/asm/immap_85xx.h +++ b/arch/powerpc/include/asm/immap_85xx.h @@ -1772,7 +1772,8 @@ typedef struct ccsr_gur { u32 cgencrl; /* Core general control */ u8 res31[184]; u32 sriopstecr; /* SRIO prescaler timer enable control */ - u8 res32[1788]; + u32 dcsrcr; /* DCSR Control register */ + u8 res32[1784]; u32 pmuxcr; /* Pin multiplexing control */ u8 res33[60]; u32 iovselsr; /* I/O voltage selection status */ @@ -1785,6 +1786,10 @@ typedef struct ccsr_gur { u8 res37[380]; } ccsr_gur_t;
+#define FSL_CORENET_DCSR_SZ_MASK 0x00000003 +#define FSL_CORENET_DCSR_SZ_4M 0x0 +#define FSL_CORENET_DCSR_SZ_1G 0x3 + /* * On p4080 we have an LIODN for msg unit (rmu) but not maintenance * everything after has RMan thus msg unit LIODN is used for maintenance diff --git a/board/freescale/corenet_ds/law.c b/board/freescale/corenet_ds/law.c index dd6f6f7..58f23c5 100644 --- a/board/freescale/corenet_ds/law.c +++ b/board/freescale/corenet_ds/law.c @@ -37,7 +37,8 @@ struct law_entry law_table[] = { #endif SET_LAW(PIXIS_BASE_PHYS, LAW_SIZE_4K, LAW_TRGT_IF_LBC), #ifdef CONFIG_SYS_DCSRBAR_PHYS - SET_LAW(CONFIG_SYS_DCSRBAR_PHYS, LAW_SIZE_4M, LAW_TRGT_IF_DCSR), + /* Limit DCSR to 32M to access NPC Trace Buffer */ + SET_LAW(CONFIG_SYS_DCSRBAR_PHYS, LAW_SIZE_32M, LAW_TRGT_IF_DCSR), #endif #ifdef CONFIG_SYS_NAND_BASE_PHYS SET_LAW(CONFIG_SYS_NAND_BASE_PHYS, LAW_SIZE_1M, LAW_TRGT_IF_LBC),