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stlink: fix handling of DPv1 and DPv2 banked registers 

Arm DPv1 and DPv2 support banked registers by setting the bank in
field DPBANKSEL of register DP_SELECT.
Old ST-Link firmware don't support banked registers and setting a
bank other than bank zero on DPv1 or DPv2 cause issues in the
firmware because it cannot set back bank zero to read CTRL/STAT.
New ST-Link firmware mask away DPBANKSEL bits while writing in
DP_SELECT but support banked register using the same packed method
used by OpenOCD:
	#define BANK_REG(bank, reg) (((bank) << 4) | (reg))

Add a new macro STLINK_F_HAS_DPBANKSEL for firmware that support
arm DPv1 and DPv2, plus trigger an error if banked registers are
requested on old firmware.
Prevent changing DPBANKSEL on old firmware.
Log a debug message when changing DPBANKSEL will be ignored.

Change-Id: Iaa592517831d63f8da2290db54f6b32504e3081b
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/4978
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
This commit is contained in:
Antonio Borneo 2019-02-28 10:28:26 +01:00 committed by Tomas Vanek
parent 944d3e6771
commit d2308da6e9
1 changed files with 27 additions and 0 deletions
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27
src/jtag/drivers/stlink_usb.c
View File

@ -316,6 +316,7 @@ enum stlink_mode {
#define STLINK_F_HAS_DAP_REG BIT(5)
#define STLINK_F_QUIRK_JTAG_DP_READ BIT(6)
#define STLINK_F_HAS_AP_INIT BIT(7)
#define STLINK_F_HAS_DPBANKSEL BIT(8)
/* aliases */
#define STLINK_F_HAS_TARGET_VOLT STLINK_F_HAS_TRACE
@ -1021,6 +1022,10 @@ static int stlink_usb_version(void *handle)
if (h->version.jtag >= 28)
flags |= STLINK_F_HAS_AP_INIT;
/* Banked regs (DPv1 & DPv2) support from V2J32 */
if (h->version.jtag >= 32)
flags |= STLINK_F_HAS_DPBANKSEL;
break;
case 3:
/* all STLINK-V3 use api-v3 */
@ -1044,6 +1049,10 @@ static int stlink_usb_version(void *handle)
/* API required to init AP before any AP access */
flags |= STLINK_F_HAS_AP_INIT;
/* Banked regs (DPv1 & DPv2) support from V3J2 */
if (h->version.jtag >= 2)
flags |= STLINK_F_HAS_DPBANKSEL;
break;
default:
break;
@ -3259,6 +3268,12 @@ static int stlink_dap_op_queue_dp_read(struct adiv5_dap *dap, unsigned reg,
uint32_t dummy;
int retval;
if (!(stlink_dap_handle->version.flags & STLINK_F_HAS_DPBANKSEL))
if (reg & 0x000000F0) {
LOG_ERROR("Banked DP registers not supported in current STLink FW");
return ERROR_COMMAND_NOTFOUND;
}
retval = stlink_dap_check_reconnect(dap);
if (retval != ERROR_OK)
return retval;
@ -3286,6 +3301,18 @@ static int stlink_dap_op_queue_dp_write(struct adiv5_dap *dap, unsigned reg,
{
int retval;
if (!(stlink_dap_handle->version.flags & STLINK_F_HAS_DPBANKSEL))
if (reg & 0x000000F0) {
LOG_ERROR("Banked DP registers not supported in current STLink FW");
return ERROR_COMMAND_NOTFOUND;
}
if (reg == DP_SELECT && (data & DP_SELECT_DPBANK) != 0) {
/* ignored if STLINK_F_HAS_DPBANKSEL, not properly managed otherwise */
LOG_DEBUG("Ignoring DPBANKSEL while write SELECT");
data &= ~DP_SELECT_DPBANK;
}
retval = stlink_dap_check_reconnect(dap);
if (retval != ERROR_OK)
return retval;