aarch64: speed up first examination

Don't use atomic dap operations when not necessary. Also remove
loop trying to set core power request, didn't find a platform
where it actually worked and it's slowing examination down.

Change-Id: I44e5c2f289f951b8f4579f08a841172404a52053
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
Reviewed-on: http://openocd.zylin.com/4143
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

diff --git a/src/target/aarch64.c b/src/target/aarch64.c
index f1ce91459dd69665a78cc2d1f1c468a0d069c984..784274a0e5913415612c3c8f3913add4db38e405 100644 (file)
--- a/src/target/aarch64.c
+++ b/src/target/aarch64.c
@@ -180,7 +180,7 @@ static int aarch64_init_debug_access(struct target *target)
        int retval;
        uint32_t dummy;
 
-       LOG_DEBUG(" ");
+       LOG_DEBUG("%s", target_name(target));
 
        retval = mem_ap_write_atomic_u32(armv8->debug_ap,
                        armv8->debug_base + CPUV8_DBG_OSLAR, 0);
@@ -2173,7 +2173,7 @@ static int aarch64_examine_first(struct target *target)
        int retval = ERROR_OK;
        uint64_t debug, ttypr;
        uint32_t cpuid;
-       uint32_t tmp0, tmp1;
+       uint32_t tmp0, tmp1, tmp2, tmp3;
        debug = ttypr = cpuid = 0;
 
        retval = dap_dp_init(swjdp);
@@ -2213,32 +2213,6 @@ static int aarch64_examine_first(struct target *target)
        } else
                armv8->debug_base = target->dbgbase;
 
-       uint32_t prsr;
-       int64_t then = timeval_ms();
-       do {
-               retval = mem_ap_read_atomic_u32(armv8->debug_ap,
-                               armv8->debug_base + CPUV8_DBG_PRSR, &prsr);
-               if (retval == ERROR_OK) {
-                       retval = mem_ap_write_atomic_u32(armv8->debug_ap,
-                                       armv8->debug_base + CPUV8_DBG_PRCR, PRCR_COREPURQ|PRCR_CORENPDRQ);
-                       if (retval != ERROR_OK) {
-                               LOG_DEBUG("write to PRCR failed");
-                               break;
-                       }
-               }
-
-               if (timeval_ms() > then + 1000) {
-                       retval = ERROR_TARGET_TIMEOUT;
-                       break;
-               }
-
-       } while ((prsr & PRSR_PU) == 0);
-
-       if (retval != ERROR_OK) {
-               LOG_ERROR("target %s: failed to set power state of the core.", target_name(target));
-               return retval;
-       }
-
        retval = mem_ap_write_atomic_u32(armv8->debug_ap,
                        armv8->debug_base + CPUV8_DBG_OSLAR, 0);
        if (retval != ERROR_OK) {
@@ -2246,34 +2220,40 @@ static int aarch64_examine_first(struct target *target)
                return retval;
        }
 
-       retval = mem_ap_read_atomic_u32(armv8->debug_ap,
+       retval = mem_ap_read_u32(armv8->debug_ap,
                        armv8->debug_base + CPUV8_DBG_MAINID0, &cpuid);
        if (retval != ERROR_OK) {
                LOG_DEBUG("Examine %s failed", "CPUID");
                return retval;
        }
 
-       retval = mem_ap_read_atomic_u32(armv8->debug_ap,
+       retval = mem_ap_read_u32(armv8->debug_ap,
                        armv8->debug_base + CPUV8_DBG_MEMFEATURE0, &tmp0);
-       retval += mem_ap_read_atomic_u32(armv8->debug_ap,
+       retval += mem_ap_read_u32(armv8->debug_ap,
                        armv8->debug_base + CPUV8_DBG_MEMFEATURE0 + 4, &tmp1);
        if (retval != ERROR_OK) {
                LOG_DEBUG("Examine %s failed", "Memory Model Type");
                return retval;
        }
-       ttypr |= tmp1;
-       ttypr = (ttypr << 32) | tmp0;
-
-       retval = mem_ap_read_atomic_u32(armv8->debug_ap,
-                       armv8->debug_base + CPUV8_DBG_DBGFEATURE0, &tmp0);
-       retval += mem_ap_read_atomic_u32(armv8->debug_ap,
-                       armv8->debug_base + CPUV8_DBG_DBGFEATURE0 + 4, &tmp1);
+       retval = mem_ap_read_u32(armv8->debug_ap,
+                       armv8->debug_base + CPUV8_DBG_DBGFEATURE0, &tmp2);
+       retval += mem_ap_read_u32(armv8->debug_ap,
+                       armv8->debug_base + CPUV8_DBG_DBGFEATURE0 + 4, &tmp3);
        if (retval != ERROR_OK) {
                LOG_DEBUG("Examine %s failed", "ID_AA64DFR0_EL1");
                return retval;
        }
-       debug |= tmp1;
-       debug = (debug << 32) | tmp0;
+
+       retval = dap_run(armv8->debug_ap->dap);
+       if (retval != ERROR_OK) {
+               LOG_ERROR("%s: examination failed\n", target_name(target));
+               return retval;
+       }
+
+       ttypr |= tmp1;
+       ttypr = (ttypr << 32) | tmp0;
+       debug |= tmp3;
+       debug = (debug << 32) | tmp2;
 
        LOG_DEBUG("cpuid = 0x%08" PRIx32, cpuid);
        LOG_DEBUG("ttypr = 0x%08" PRIx64, ttypr);