static int swd_connect(struct adiv5_dap *dap)
{
- uint32_t idcode;
+ uint32_t dpidr;
int status;
/* FIXME validate transport config ... is the
* configured DAP present (check IDCODE)?
* Is *only* one DAP configured?
*
- * MUST READ IDCODE
+ * MUST READ DPIDR
*/
/* Note, debugport_init() does setup too */
jtag_interface->swd->switch_seq(JTAG_TO_SWD);
+ /* Clear link state, including the SELECT cache. */
dap->do_reconnect = false;
+ dap->select = DP_SELECT_INVALID;
- swd_queue_dp_read(dap, DP_IDCODE, &idcode);
+ swd_queue_dp_read(dap, DP_DPIDR, &dpidr);
/* force clear all sticky faults */
swd_clear_sticky_errors(dap);
status = swd_run_inner(dap);
if (status == ERROR_OK) {
- LOG_INFO("SWD IDCODE %#8.8" PRIx32, idcode);
+ LOG_INFO("SWD DPIDR %#8.8" PRIx32, dpidr);
dap->do_reconnect = false;
} else
dap->do_reconnect = true;
/** Select the DP register bank matching bits 7:4 of reg. */
static void swd_queue_dp_bankselect(struct adiv5_dap *dap, unsigned reg)
{
- uint32_t select_dp_bank = (reg & 0x000000F0) >> 4;
-
- if (reg == DP_SELECT)
+ /* Only register address 4 is banked. */
+ if ((reg & 0xf) != 4)
return;
- if (select_dp_bank == dap->dp_bank_value)
+ uint32_t select_dp_bank = (reg & 0x000000F0) >> 4;
+ uint32_t sel = select_dp_bank
+ | (dap->select & (DP_SELECT_APSEL | DP_SELECT_APBANK));
+
+ if (sel == dap->select)
return;
- dap->dp_bank_value = select_dp_bank;
- select_dp_bank |= dap->ap_current | dap->ap_bank_value;
+ dap->select = sel;
- swd_queue_dp_write(dap, DP_SELECT, select_dp_bank);
+ swd_queue_dp_write(dap, DP_SELECT, sel);
}
static int swd_queue_dp_read(struct adiv5_dap *dap, unsigned reg,
}
/** Select the AP register bank matching bits 7:4 of reg. */
-static void swd_queue_ap_bankselect(struct adiv5_dap *dap, unsigned reg)
+static void swd_queue_ap_bankselect(struct adiv5_ap *ap, unsigned reg)
{
- uint32_t select_ap_bank = reg & 0x000000F0;
+ struct adiv5_dap *dap = ap->dap;
+ uint32_t sel = ((uint32_t)ap->ap_num << 24)
+ | (reg & 0x000000F0)
+ | (dap->select & DP_SELECT_DPBANK);
- if (select_ap_bank == dap->ap_bank_value)
+ if (sel == dap->select)
return;
- dap->ap_bank_value = select_ap_bank;
- select_ap_bank |= dap->ap_current | dap->dp_bank_value;
+ dap->select = sel;
- swd_queue_dp_write(dap, DP_SELECT, select_ap_bank);
+ swd_queue_dp_write(dap, DP_SELECT, sel);
}
-static int swd_queue_ap_read(struct adiv5_dap *dap, unsigned reg,
+static int swd_queue_ap_read(struct adiv5_ap *ap, unsigned reg,
uint32_t *data)
{
const struct swd_driver *swd = jtag_interface->swd;
assert(swd);
+ struct adiv5_dap *dap = ap->dap;
+
int retval = swd_check_reconnect(dap);
if (retval != ERROR_OK)
return retval;
- swd_queue_ap_bankselect(dap, reg);
- swd->read_reg(swd_cmd(true, true, reg), dap->last_read, dap->ap[dap_ap_get_select(dap)].memaccess_tck);
+ swd_queue_ap_bankselect(ap, reg);
+ swd->read_reg(swd_cmd(true, true, reg), dap->last_read, ap->memaccess_tck);
dap->last_read = data;
return check_sync(dap);
}
-static int swd_queue_ap_write(struct adiv5_dap *dap, unsigned reg,
+static int swd_queue_ap_write(struct adiv5_ap *ap, unsigned reg,
uint32_t data)
{
const struct swd_driver *swd = jtag_interface->swd;
assert(swd);
+ struct adiv5_dap *dap = ap->dap;
+
int retval = swd_check_reconnect(dap);
if (retval != ERROR_OK)
return retval;
swd_finish_read(dap);
- swd_queue_ap_bankselect(dap, reg);
- swd->write_reg(swd_cmd(false, true, reg), data, dap->ap[dap_ap_get_select(dap)].memaccess_tck);
+ swd_queue_ap_bankselect(ap, reg);
+ swd->write_reg(swd_cmd(false, true, reg), data, ap->memaccess_tck);
return check_sync(dap);
}
return retval;
}
-COMMAND_HANDLER(handle_swd_wcr)
-{
- int retval;
- struct target *target = get_current_target(CMD_CTX);
- struct arm *arm = target_to_arm(target);
- struct adiv5_dap *dap = arm->dap;
- uint32_t wcr;
- unsigned trn, scale = 0;
-
- switch (CMD_ARGC) {
- /* no-args: just dump state */
- case 0:
- /*retval = swd_queue_dp_read(dap, DP_WCR, &wcr); */
- retval = dap_queue_dp_read(dap, DP_WCR, &wcr);
- if (retval == ERROR_OK)
- dap->ops->run(dap);
- if (retval != ERROR_OK) {
- LOG_ERROR("can't read WCR?");
- return retval;
- }
-
- command_print(CMD_CTX,
- "turnaround=%" PRIu32 ", prescale=%" PRIu32,
- WCR_TO_TRN(wcr),
- WCR_TO_PRESCALE(wcr));
- return ERROR_OK;
-
- case 2: /* TRN and prescale */
- COMMAND_PARSE_NUMBER(uint, CMD_ARGV[1], scale);
- if (scale > 7) {
- LOG_ERROR("prescale %d is too big", scale);
- return ERROR_FAIL;
- }
- /* FALL THROUGH */
-
- case 1: /* TRN only */
- COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], trn);
- if (trn < 1 || trn > 4) {
- LOG_ERROR("turnaround %d is invalid", trn);
- return ERROR_FAIL;
- }
-
- wcr = ((trn - 1) << 8) | scale;
- /* FIXME
- * write WCR ...
- * then, re-init adapter with new TRN
- */
- LOG_ERROR("can't yet modify WCR");
- return ERROR_FAIL;
-
- default: /* too many arguments */
- return ERROR_COMMAND_SYNTAX_ERROR;
- }
-}
-
static const struct command_registration swd_commands[] = {
{
/*
.mode = COMMAND_CONFIG,
.help = "declare a new SWD DAP"
},
- {
- .name = "wcr",
- .handler = handle_swd_wcr,
- .mode = COMMAND_ANY,
- .help = "display or update DAP's WCR register",
- .usage = "turnaround (1..4), prescale (0..7)",
- },
-
- /* REVISIT -- add a command for SWV trace on/off */
COMMAND_REGISTRATION_DONE
};
projects / openocd / blobdiff