diff options
Diffstat (limited to 'src/target/arm_adi_v5.c')
| -rw-r--r-- | src/target/arm_adi_v5.c | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/src/target/arm_adi_v5.c b/src/target/arm_adi_v5.c index bfa5cb42..40895678 100644 --- a/src/target/arm_adi_v5.c +++ b/src/target/arm_adi_v5.c @@ -334,7 +334,10 @@ int jtagdp_transaction_endcheck(struct swjdp_common *swjdp) { uint32_t mem_ap_csw, mem_ap_tar; - /* Maybe print information about last MEM-AP access */ + /* Maybe print information about last intended + * MEM-AP access; but not if autoincrementing. + * *Real* CSW and TAR values are always shown. + */ if (swjdp->ap_tar_value != (uint32_t) -1) LOG_DEBUG("MEM-AP Cached values: " "ap_bank 0x%" PRIx32 @@ -343,8 +346,6 @@ int jtagdp_transaction_endcheck(struct swjdp_common *swjdp) swjdp->dp_select_value, swjdp->ap_csw_value, swjdp->ap_tar_value); - else - LOG_ERROR("Invalid MEM-AP TAR cache!"); if (ctrlstat & SSTICKYORUN) LOG_ERROR("JTAG-DP OVERRUN - check clock, " @@ -463,12 +464,21 @@ int dap_ap_read_reg_u32(struct swjdp_common *swjdp, uint32_t reg_addr, uint32_t return ERROR_OK; } -/*************************************************************************** - * * - * AHB-AP access to memory and system registers on AHB bus * - * * -***************************************************************************/ - +/** + * Set up transfer parameters for the currently selected MEM-AP. + * Subsequent transfers using registers like AP_REG_DRW or AP_REG_BD2 + * initiate data reads or writes using memory or peripheral addresses. + * If the CSW is configured for it, the TAR may be automatically + * incremented after each transfer. + * + * @todo Rename to reflect it being specifically a MEM-AP function. + * + * @param swjdp The DAP connected to the MEM-AP. + * @param csw MEM-AP Control/Status Word (CSW) register to assign. If this + * matches the cached value, the register is not changed. + * @param tar MEM-AP Transfer Address Register (TAR) to assign. If this + * matches the cached address, the register is not changed. + */ int dap_setup_accessport(struct swjdp_common *swjdp, uint32_t csw, uint32_t tar) { csw = csw | CSW_DBGSWENABLE | CSW_MASTER_DEBUG | CSW_HPROT; @@ -484,11 +494,9 @@ int dap_setup_accessport(struct swjdp_common *swjdp, uint32_t csw, uint32_t tar) dap_ap_write_reg_u32(swjdp, AP_REG_TAR, tar); swjdp->ap_tar_value = tar; } + /* Disable TAR cache when autoincrementing */ if (csw & CSW_ADDRINC_MASK) - { - /* Do not cache TAR value when autoincrementing */ swjdp->ap_tar_value = -1; - } return ERROR_OK; } |