diff options
Diffstat (limited to 'src/target/adi_v5_swd.c')
| -rw-r--r-- | src/target/adi_v5_swd.c | 112 |
1 files changed, 101 insertions, 11 deletions
diff --git a/src/target/adi_v5_swd.c b/src/target/adi_v5_swd.c index 6ff858a..c9c3ae5 100644 --- a/src/target/adi_v5_swd.c +++ b/src/target/adi_v5_swd.c @@ -58,14 +58,56 @@ /* YUK! - but this is currently a global.... */ extern struct jtag_interface *jtag_interface; +static int (swd_queue_dp_write)(struct adiv5_dap *dap, unsigned reg, + uint32_t data); + +static int swd_queue_ap_abort(struct adiv5_dap *dap, uint8_t *ack) +{ + const struct swd_driver *swd = jtag_interface->swd; + assert(swd); + + return swd->write_reg(swd_cmd(false, false, DP_ABORT), + STKCMPCLR | STKERRCLR | WDERRCLR | ORUNERRCLR); +} + +/** Select the DP register bank matching bits 7:4 of reg. */ +static int swd_queue_dp_bankselect(struct adiv5_dap *dap, unsigned reg) +{ + uint32_t select_dp_bank = (reg & 0x000000F0) >> 4; + + if (reg == DP_SELECT) + return ERROR_OK; + + if (select_dp_bank == dap->dp_bank_value) + return ERROR_OK; + + dap->dp_bank_value = select_dp_bank; + select_dp_bank |= dap->ap_current | dap->ap_bank_value; + + return swd_queue_dp_write(dap, DP_SELECT, select_dp_bank); +} + static int swd_queue_dp_read(struct adiv5_dap *dap, unsigned reg, uint32_t *data) { + int retval; /* REVISIT status return vs ack ... */ const struct swd_driver *swd = jtag_interface->swd; assert(swd); - return swd->read_reg(swd_cmd(true, false, reg), data); + retval = swd_queue_dp_bankselect(dap, reg); + if (retval != ERROR_OK) + return retval; + + retval = swd->read_reg(swd_cmd(true, false, reg), data); + + if (retval != ERROR_OK) { + /* fault response */ + uint8_t ack = retval & 0xff; + swd_queue_ap_abort(dap, &ack); + } + + return retval; } static int swd_queue_idcode_read(struct adiv5_dap *dap, @@ -82,39 +124,82 @@ static int swd_queue_idcode_read(struct adiv5_dap *dap, static int (swd_queue_dp_write)(struct adiv5_dap *dap, unsigned reg, uint32_t data) { + int retval; /* REVISIT status return vs ack ... */ const struct swd_driver *swd = jtag_interface->swd; assert(swd); - return swd->write_reg(swd_cmd(false, false, reg), data); + retval = swd_queue_dp_bankselect(dap, reg); + if (retval != ERROR_OK) + return retval; + + retval = swd->write_reg(swd_cmd(false, false, reg), data); + + if (retval != ERROR_OK) { + /* fault response */ + uint8_t ack = retval & 0xff; + swd_queue_ap_abort(dap, &ack); + } + + return retval; } +/** Select the AP register bank matching bits 7:4 of reg. */ +static int swd_queue_ap_bankselect(struct adiv5_dap *dap, unsigned reg) +{ + uint32_t select_ap_bank = reg & 0x000000F0; + + if (select_ap_bank == dap->ap_bank_value) + return ERROR_OK; + + dap->ap_bank_value = select_ap_bank; + select_ap_bank |= dap->ap_current | dap->dp_bank_value; + + return swd_queue_dp_write(dap, DP_SELECT, select_ap_bank); +} static int (swd_queue_ap_read)(struct adiv5_dap *dap, unsigned reg, uint32_t *data) { - /* REVISIT APSEL ... */ /* REVISIT status return ... */ const struct swd_driver *swd = jtag_interface->swd; assert(swd); - return swd->read_reg(swd_cmd(true, true, reg), data); + int retval = swd_queue_ap_bankselect(dap, reg); + if (retval != ERROR_OK) + return retval; + + retval = swd->read_reg(swd_cmd(true, true, reg), data); + + if (retval != ERROR_OK) { + /* fault response */ + uint8_t ack = retval & 0xff; + swd_queue_ap_abort(dap, &ack); + } + + return retval; } static int (swd_queue_ap_write)(struct adiv5_dap *dap, unsigned reg, uint32_t data) { - /* REVISIT APSEL ... */ /* REVISIT status return ... */ const struct swd_driver *swd = jtag_interface->swd; assert(swd); - return swd->write_reg(swd_cmd(false, true, reg), data); -} + int retval = swd_queue_ap_bankselect(dap, reg); + if (retval != ERROR_OK) + return retval; -static int (swd_queue_ap_abort)(struct adiv5_dap *dap, uint8_t *ack) -{ - return ERROR_FAIL; + retval = swd->write_reg(swd_cmd(false, true, reg), data); + + if (retval != ERROR_OK) { + /* fault response */ + uint8_t ack = retval & 0xff; + swd_queue_ap_abort(dap, &ack); + } + + return retval; } /** Executes all queued DAP operations. */ @@ -356,8 +441,13 @@ static int swd_init(struct command_context *ctx) if (status == ERROR_OK) LOG_INFO("SWD IDCODE %#8.8" PRIx32, idcode); - return status; + /* force clear all sticky faults */ + swd_queue_ap_abort(dap, &ack); + + /* this is a workaround to get polling working */ + jtag_add_reset(0, 0); + return status; } static struct transport swd_transport = { |