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target/adi_v5_swd: improve error check while updating DP_SELECT 

Write to register DP_SELECT can fail, but both functions
swd_queue_dp_bankselect() and swd_queue_ap_bankselect() return
void and do not propagate the error.

Change the return type of the two functions to int and check the
returned value.
Invalidate the cached value of DP_SELECT if the write fails.

Change-Id: Iba6ef8b0c2332e7f7efb66337d558fb7a4a0d39c
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/4980
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
reverse-resume-order
Antonio Borneo 2019-02-28 12:29:49 +01:00 committed by Tomas Vanek
parent 420a692e0f
commit 0323c9bcbd
1 changed files with 42 additions and 13 deletions
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55
src/target/adi_v5_swd.c
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@ -166,22 +166,26 @@ static int swd_queue_ap_abort(struct adiv5_dap *dap, uint8_t *ack)
}
/** Select the DP register bank matching bits 7:4 of reg. */
static void swd_queue_dp_bankselect(struct adiv5_dap *dap, unsigned reg)
static int swd_queue_dp_bankselect(struct adiv5_dap *dap, unsigned reg)
{
/* Only register address 4 is banked. */
if ((reg & 0xf) != 4)
return;
return ERROR_OK;
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;
return ERROR_OK;
dap->select = sel;
swd_queue_dp_write(dap, DP_SELECT, sel);
int retval = swd_queue_dp_write(dap, DP_SELECT, sel);
if (retval != ERROR_OK)
dap->select = DP_SELECT_INVALID;
return retval;
}
static int swd_queue_dp_read(struct adiv5_dap *dap, unsigned reg,
@ -194,7 +198,10 @@ static int swd_queue_dp_read(struct adiv5_dap *dap, unsigned reg,
if (retval != ERROR_OK)
return retval;
swd_queue_dp_bankselect(dap, reg);
retval = swd_queue_dp_bankselect(dap, reg);
if (retval != ERROR_OK)
return retval;
swd->read_reg(swd_cmd(true, false, reg), data, 0);
return check_sync(dap);
@ -211,17 +218,29 @@ static int swd_queue_dp_write(struct adiv5_dap *dap, unsigned reg,
return retval;
swd_finish_read(dap);
if (reg == DP_SELECT)
if (reg == DP_SELECT) {
dap->select = data & (DP_SELECT_APSEL | DP_SELECT_APBANK | DP_SELECT_DPBANK);
else
swd_queue_dp_bankselect(dap, reg);
swd->write_reg(swd_cmd(false, false, reg), data, 0);
retval = check_sync(dap);
if (retval != ERROR_OK)
dap->select = DP_SELECT_INVALID;
return retval;
}
retval = swd_queue_dp_bankselect(dap, reg);
if (retval != ERROR_OK)
return retval;
swd->write_reg(swd_cmd(false, false, reg), data, 0);
return check_sync(dap);
}
/** Select the AP register bank matching bits 7:4 of reg. */
static void swd_queue_ap_bankselect(struct adiv5_ap *ap, unsigned reg)
static int swd_queue_ap_bankselect(struct adiv5_ap *ap, unsigned reg)
{
struct adiv5_dap *dap = ap->dap;
uint32_t sel = ((uint32_t)ap->ap_num << 24)
@ -229,11 +248,15 @@ static void swd_queue_ap_bankselect(struct adiv5_ap *ap, unsigned reg)
| (dap->select & DP_SELECT_DPBANK);
if (sel == dap->select)
return;
return ERROR_OK;
dap->select = sel;
swd_queue_dp_write(dap, DP_SELECT, sel);
int retval = swd_queue_dp_write(dap, DP_SELECT, sel);
if (retval != ERROR_OK)
dap->select = DP_SELECT_INVALID;
return retval;
}
static int swd_queue_ap_read(struct adiv5_ap *ap, unsigned reg,
@ -247,7 +270,10 @@ static int swd_queue_ap_read(struct adiv5_ap *ap, unsigned reg,
if (retval != ERROR_OK)
return retval;
swd_queue_ap_bankselect(ap, reg);
retval = swd_queue_ap_bankselect(ap, reg);
if (retval != ERROR_OK)
return retval;
swd->read_reg(swd_cmd(true, true, reg), dap->last_read, ap->memaccess_tck);
dap->last_read = data;
@ -266,7 +292,10 @@ static int swd_queue_ap_write(struct adiv5_ap *ap, unsigned reg,
return retval;
swd_finish_read(dap);
swd_queue_ap_bankselect(ap, reg);
retval = swd_queue_ap_bankselect(ap, reg);
if (retval != ERROR_OK)
return retval;
swd->write_reg(swd_cmd(false, true, reg), data, ap->memaccess_tck);
return check_sync(dap);