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cortex_m: Discover the AP to use, just like Cortex-A 

This required fixing the AP ID parsing in dap_find_ap() to
match IHI0031C. The AXI type was added too.

Change-Id: I44577a7848df37586e650dce0fb57ac26f5f858c
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/3146
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>
This commit is contained in:
Andreas Fritiofson 2015-12-06 01:21:41 +01:00
parent cd12c423dc
commit beb843d28d
3 changed files with 18 additions and 7 deletions
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11
src/target/arm_adi_v5.c
View File

@ -825,9 +825,10 @@ int dap_find_ap(struct adiv5_dap *dap, enum ap_type type_to_find, uint8_t *ap_nu
* 31-28 : Revision
* 27-24 : JEDEC bank (0x4 for ARM)
* 23-17 : JEDEC code (0x3B for ARM)
* 16 : Mem-AP
* 15-8 : Reserved
* 7-0 : AP Identity (1=AHB-AP 2=APB-AP 0x10=JTAG-AP)
* 16-13 : Class (0b1000=Mem-AP)
* 12-8 : Reserved
* 7-4 : AP Variant (non-zero for JTAG-AP)
* 3-0 : AP Type (0=JTAG-AP 1=AHB-AP 2=APB-AP 4=AXI-AP)
*/
/* Reading register for a non-existant AP should not cause an error,
@ -835,11 +836,12 @@ int dap_find_ap(struct adiv5_dap *dap, enum ap_type type_to_find, uint8_t *ap_nu
*/
if ((retval == ERROR_OK) && /* Register read success */
((id_val & 0x0FFF0000) == 0x04770000) && /* Jedec codes match */
((id_val & 0xFF) == type_to_find)) { /* type matches*/
((id_val & 0xF) == type_to_find)) { /* type matches*/
LOG_DEBUG("Found %s at AP index: %d (IDR=0x%08" PRIX32 ")",
(type_to_find == AP_TYPE_AHB_AP) ? "AHB-AP" :
(type_to_find == AP_TYPE_APB_AP) ? "APB-AP" :
(type_to_find == AP_TYPE_AXI_AP) ? "AXI-AP" :
(type_to_find == AP_TYPE_JTAG_AP) ? "JTAG-AP" : "Unknown",
ap, id_val);
@ -851,6 +853,7 @@ int dap_find_ap(struct adiv5_dap *dap, enum ap_type type_to_find, uint8_t *ap_nu
LOG_DEBUG("No %s found",
(type_to_find == AP_TYPE_AHB_AP) ? "AHB-AP" :
(type_to_find == AP_TYPE_APB_AP) ? "APB-AP" :
(type_to_find == AP_TYPE_AXI_AP) ? "AXI-AP" :
(type_to_find == AP_TYPE_JTAG_AP) ? "JTAG-AP" : "Unknown");
return ERROR_FAIL;
}

7
src/target/arm_adi_v5.h
View File

@ -279,9 +279,10 @@ struct dap_ops {
* Access Port types
*/
enum ap_type {
AP_TYPE_AHB_AP = 0x01, /* AHB Memory-AP */
AP_TYPE_APB_AP = 0x02, /* APB Memory-AP */
AP_TYPE_JTAG_AP = 0x10 /* JTAG-AP - JTAG master for controlling other JTAG devices */
AP_TYPE_JTAG_AP = 0x0, /* JTAG-AP - JTAG master for controlling other JTAG devices */
AP_TYPE_AHB_AP = 0x1, /* AHB Memory-AP */
AP_TYPE_APB_AP = 0x2, /* APB Memory-AP */
AP_TYPE_AXI_AP = 0x4, /* AXI Memory-AP */
};
/**

7
src/target/cortex_m.c
View File

@ -1903,6 +1903,13 @@ int cortex_m_examine(struct target *target)
struct adiv5_dap *swjdp = cortex_m->armv7m.arm.dap;
struct armv7m_common *armv7m = target_to_armv7m(target);
/* Search for the MEM-AP */
retval = dap_find_ap(swjdp, AP_TYPE_AHB_AP, &armv7m->debug_ap);
if (retval != ERROR_OK) {
LOG_ERROR("Could not find MEM-AP to control the core");
return retval;
}
/* Leave (only) generic DAP stuff for debugport_init(); */
swjdp->ap[armv7m->debug_ap].memaccess_tck = 8;