diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/target/arm_adi_v5.c | 115 | ||||
| -rw-r--r-- | src/target/arm_adi_v5.h | 163 |
2 files changed, 278 insertions, 0 deletions
diff --git a/src/target/arm_adi_v5.c b/src/target/arm_adi_v5.c index 115ccf12..735308a4 100644 --- a/src/target/arm_adi_v5.c +++ b/src/target/arm_adi_v5.c @@ -350,6 +350,11 @@ int jtagdp_transaction_endcheck(struct swjdp_common *swjdp) * * ***************************************************************************/ +/* FIXME remove dap_dp_{read,write}_reg() ... these should become the + * bodies of the JTAG implementations of dap_queue_dp_{read,write}() and + * callers should switch over to the transport-neutral calls. + */ + static int dap_dp_write_reg(struct swjdp_common *swjdp, uint32_t value, uint8_t reg_addr) { @@ -403,6 +408,12 @@ static int dap_ap_bankselect(struct swjdp_common *swjdp, uint32_t ap_reg) return ERROR_OK; } +/* FIXME remove dap_ap_{read,write}_reg() and dap_ap_write_reg_u32() + * ... these should become the bodies of the JTAG implementations of + * dap_queue_ap_{read,write}(), then all their current callers should + * switch over to the transport-neutral calls. + */ + static int dap_ap_write_reg(struct swjdp_common *swjdp, uint32_t reg_addr, uint8_t *out_value_buf) { @@ -1143,6 +1154,107 @@ int mem_ap_read_buf_u8(struct swjdp_common *swjdp, uint8_t *buffer, return retval; } +/*--------------------------------------------------------------------------*/ + +static int jtag_idcode_q_read(struct swjdp_common *dap, + uint8_t *ack, uint32_t *data) +{ + struct arm_jtag *jtag_info = dap->jtag_info; + int retval; + struct scan_field fields[1]; + + jtag_set_end_state(TAP_IDLE); + + /* This is a standard JTAG operation -- no DAP tweakage */ + retval = arm_jtag_set_instr(jtag_info, JTAG_DP_IDCODE, NULL); + if (retval != ERROR_OK) + return retval; + + fields[0].tap = jtag_info->tap; + fields[0].num_bits = 32; + fields[0].out_value = NULL; + fields[0].in_value = (void *) data; + + jtag_add_dr_scan(1, fields, jtag_get_end_state()); + retval = jtag_get_error(); + if (retval != ERROR_OK) + return retval; + + jtag_add_callback(arm_le_to_h_u32, + (jtag_callback_data_t) data); + + return retval; +} + +static int jtag_dp_q_read(struct swjdp_common *dap, unsigned reg, + uint32_t *data) +{ + return dap_dp_read_reg(dap, data, reg); +} + +static int jtag_dp_q_write(struct swjdp_common *dap, unsigned reg, + uint32_t data) +{ + return dap_dp_write_reg(dap, data, reg); +} + +static int jtag_ap_q_bankselect(struct swjdp_common *dap, unsigned reg) +{ + uint32_t select = reg & 0x000000F0; + + if (select == dap->ap_bank_value) + return ERROR_OK; + dap->ap_bank_value = select; + + select |= dap->apsel; + + return jtag_dp_q_write(dap, DP_SELECT, select); +} + +static int jtag_ap_q_read(struct swjdp_common *dap, unsigned reg, + uint32_t *data) +{ + int retval = jtag_ap_q_bankselect(dap, reg); + + if (retval != ERROR_OK) + return retval; + return dap_ap_read_reg_u32(dap, reg, data); +} + +static int jtag_ap_q_write(struct swjdp_common *dap, unsigned reg, + uint32_t data) +{ + int retval = jtag_ap_q_bankselect(dap, reg); + + if (retval != ERROR_OK) + return retval; + return dap_ap_write_reg_u32(dap, reg, data); +} + +static int jtag_ap_q_abort(struct swjdp_common *dap, uint8_t *ack) +{ + /* for JTAG, this is the only valid ABORT register operation */ + return adi_jtag_dp_scan_u32(dap, JTAG_DP_ABORT, + 0, DPAP_WRITE, 1, NULL, ack); +} + +static int jtag_dp_run(struct swjdp_common *dap) +{ + return jtagdp_transaction_endcheck(dap); +} + +static const struct dap_ops jtag_dp_ops = { + .queue_idcode_read = jtag_idcode_q_read, + .queue_dp_read = jtag_dp_q_read, + .queue_dp_write = jtag_dp_q_write, + .queue_ap_read = jtag_ap_q_read, + .queue_ap_write = jtag_ap_q_write, + .queue_ap_abort = jtag_ap_q_abort, + .run = jtag_dp_run, +}; + +/*--------------------------------------------------------------------------*/ + /** * Initialize a DAP. This sets up the power domains, prepares the DP * for further use, and arranges to use AP #0 for all AP operations @@ -1164,6 +1276,9 @@ int ahbap_debugport_init(struct swjdp_common *swjdp) LOG_DEBUG(" "); + /* JTAG-DP or SWJ-DP, in JTAG mode */ + swjdp->ops = &jtag_dp_ops; + /* Default MEM-AP setup. * * REVISIT AP #0 may be an inappropriate default for this. diff --git a/src/target/arm_adi_v5.h b/src/target/arm_adi_v5.h index 5c5ca4f0..ec4a179d 100644 --- a/src/target/arm_adi_v5.h +++ b/src/target/arm_adi_v5.h @@ -124,10 +124,22 @@ * transport agent; and at least one Access Port (AP), controlling * resource access. Most common is a MEM-AP, for memory access. * + * There are two basic DP transports: JTAG, and ARM's low pin-count SWD. + * Accordingly, this interface is responsible for hiding the transport + * differences so upper layer code can largely ignore them. + * + * When the chip is implemented with JTAG-DP or SW-DP, the transport is + * fixed as JTAG or SWD, respectively. Chips incorporating SWJ-DP permit + * a choice made at board design time (by only using the SWD pins), or + * as part of setting up a debug session (if all the dual-role JTAG/SWD + * signals are available). + * * @todo Rename "swjdp_common" as "dap". Use of SWJ-DP is optional! */ struct swjdp_common { + const struct dap_ops *ops; + struct arm_jtag *jtag_info; /* Control config */ uint32_t dp_ctrl_stat; @@ -175,6 +187,157 @@ struct swjdp_common }; +/** + * Transport-neutral representation of queued DAP transactions, supporting + * both JTAG and SWD transports. All submitted transactions are logically + * queued, until the queue is executed by run(). Some implementations might + * execute transactions as soon as they're submitted, but no status is made + * availablue until run(). + */ +struct dap_ops { + /** If the DAP transport isn't SWD, it must be JTAG. Upper level + * code may need to care about the difference in some cases. + */ + bool is_swd; + + /** Reads the DAP's IDCODe register. */ + int (*queue_idcode_read)(struct swjdp_common *dap, + uint8_t *ack, uint32_t *data); + + /** DP register read. */ + int (*queue_dp_read)(struct swjdp_common *dap, unsigned reg, + uint32_t *data); + /** DP register write. */ + int (*queue_dp_write)(struct swjdp_common *dap, unsigned reg, + uint32_t data); + + /** AP register read. */ + int (*queue_ap_read)(struct swjdp_common *dap, unsigned reg, + uint32_t *data); + /** AP register write. */ + int (*queue_ap_write)(struct swjdp_common *dap, unsigned reg, + uint32_t data); + /** AP operation abort. */ + int (*queue_ap_abort)(struct swjdp_common *dap, uint8_t *ack); + + /** Executes all queued DAP operations. */ + int (*run)(struct swjdp_common *dap); +}; + +/** + * Queue an IDCODE register read. This is primarily useful for SWD + * transports, where it is required as part of link initialization. + * (For JTAG, this register is read as part of scan chain setup.) + * + * @param dap The DAP used for reading. + * @param ack Pointer to where transaction status will be stored. + * @param data Pointer saying where to store the IDCODE value. + * + * @return ERROR_OK for success, else a fault code. + */ +static inline int dap_queue_idcode_read(struct swjdp_common *dap, + uint8_t *ack, uint32_t *data) +{ + return dap->ops->queue_idcode_read(dap, ack, data); +} + +/** + * Queue a DP register read. + * Note that not all DP registers are readable; also, that JTAG and SWD + * have slight differences in DP register support. + * + * @param dap The DAP used for reading. + * @param reg The two-bit number of the DP register being read. + * @param data Pointer saying where to store the register's value + * (in host endianness). + * + * @return ERROR_OK for success, else a fault code. + */ +static inline int dap_queue_dp_read(struct swjdp_common *dap, + unsigned reg, uint32_t *data) +{ + return dap->ops->queue_dp_read(dap, reg, data); +} + +/** + * Queue a DP register write. + * Note that not all DP registers are writable; also, that JTAG and SWD + * have slight differences in DP register support. + * + * @param dap The DAP used for writing. + * @param reg The two-bit number of the DP register being written. + * @param data Value being written (host endianness) + * + * @return ERROR_OK for success, else a fault code. + */ +static inline int dap_queue_dp_write(struct swjdp_common *dap, + unsigned reg, uint32_t data) +{ + return dap->ops->queue_dp_write(dap, reg, data); +} + +/** + * Queue an AP register read. + * + * @param dap The DAP used for reading. + * @param reg The number of the AP register being read. + * @param data Pointer saying where to store the register's value + * (in host endianness). + * + * @return ERROR_OK for success, else a fault code. + */ +static inline int dap_queue_ap_read(struct swjdp_common *dap, + unsigned reg, uint32_t *data) +{ + return dap->ops->queue_ap_read(dap, reg, data); +} + +/** + * Queue an AP register write. + * + * @param dap The DAP used for writing. + * @param reg The number of the AP register being written. + * @param data Value being written (host endianness) + * + * @return ERROR_OK for success, else a fault code. + */ +static inline int dap_queue_ap_write(struct swjdp_common *dap, + unsigned reg, uint32_t data) +{ + return dap->ops->queue_ap_write(dap, reg, data); +} + +/** + * Queue an AP abort operation. The current AP transaction is aborted, + * including any update of the transaction counter. The AP is left in + * an unknown state (so it must be re-initialized). For use only after + * the AP has reported WAIT status for an extended period. + * + * @param dap The DAP used for writing. + * @param ack Pointer to where transaction status will be stored. + * + * @return ERROR_OK for success, else a fault code. + */ +static inline int dap_queue_ap_abort(struct swjdp_common *dap, uint8_t *ack) +{ + return dap->ops->queue_ap_abort(dap, ack); +} + +/** + * Perform all queued DAP operations, and clear any errors posted in the + * CTRL_STAT register when they are done. Note that if more than one AP + * operation will be queued, one of the first operations in the queue + * should probably enable CORUNDETECT in the CTRL/STAT register. + * + * @param dap The DAP used. + * + * @return ERROR_OK for success, else a fault code. + */ +static inline int dap_run(struct swjdp_common *dap) +{ + return dap->ops->run(dap); +} + /** Accessor for currently selected DAP-AP number (0..255) */ static inline uint8_t dap_ap_get_select(struct swjdp_common *swjdp) { |