adiv6: prepare for AP level ROM tables
[openocd.git] / src / target / arm_adi_v5.c
index 60bd5466694f0e1a045a6eba77eba3594faee863..ad4d7a7254416d0d9c87c466ad55c18e7b3ab703 100644 (file)
@@ -107,7 +107,7 @@ static int mem_ap_setup_csw(struct adiv5_ap *ap, uint32_t csw)
 
        if (csw != ap->csw_value) {
                /* LOG_DEBUG("DAP: Set CSW %x",csw); */
-               int retval = dap_queue_ap_write(ap, MEM_AP_REG_CSW, csw);
+               int retval = dap_queue_ap_write(ap, MEM_AP_REG_CSW(ap->dap), csw);
                if (retval != ERROR_OK) {
                        ap->csw_value = 0;
                        return retval;
@@ -121,11 +121,11 @@ static int mem_ap_setup_tar(struct adiv5_ap *ap, target_addr_t tar)
 {
        if (!ap->tar_valid || tar != ap->tar_value) {
                /* LOG_DEBUG("DAP: Set TAR %x",tar); */
-               int retval = dap_queue_ap_write(ap, MEM_AP_REG_TAR, (uint32_t)(tar & 0xffffffffUL));
+               int retval = dap_queue_ap_write(ap, MEM_AP_REG_TAR(ap->dap), (uint32_t)(tar & 0xffffffffUL));
                if (retval == ERROR_OK && is_64bit_ap(ap)) {
                        /* See if bits 63:32 of tar is different from last setting */
                        if ((ap->tar_value >> 32) != (tar >> 32))
-                               retval = dap_queue_ap_write(ap, MEM_AP_REG_TAR64, (uint32_t)(tar >> 32));
+                               retval = dap_queue_ap_write(ap, MEM_AP_REG_TAR64(ap->dap), (uint32_t)(tar >> 32));
                }
                if (retval != ERROR_OK) {
                        ap->tar_valid = false;
@@ -142,9 +142,9 @@ static int mem_ap_read_tar(struct adiv5_ap *ap, target_addr_t *tar)
        uint32_t lower;
        uint32_t upper = 0;
 
-       int retval = dap_queue_ap_read(ap, MEM_AP_REG_TAR, &lower);
+       int retval = dap_queue_ap_read(ap, MEM_AP_REG_TAR(ap->dap), &lower);
        if (retval == ERROR_OK && is_64bit_ap(ap))
-               retval = dap_queue_ap_read(ap, MEM_AP_REG_TAR64, &upper);
+               retval = dap_queue_ap_read(ap, MEM_AP_REG_TAR64(ap->dap), &upper);
 
        if (retval != ERROR_OK) {
                ap->tar_valid = false;
@@ -252,7 +252,7 @@ int mem_ap_read_u32(struct adiv5_ap *ap, target_addr_t address,
        if (retval != ERROR_OK)
                return retval;
 
-       return dap_queue_ap_read(ap, MEM_AP_REG_BD0 | (address & 0xC), value);
+       return dap_queue_ap_read(ap, MEM_AP_REG_BD0(ap->dap) | (address & 0xC), value);
 }
 
 /**
@@ -304,7 +304,7 @@ int mem_ap_write_u32(struct adiv5_ap *ap, target_addr_t address,
        if (retval != ERROR_OK)
                return retval;
 
-       return dap_queue_ap_write(ap, MEM_AP_REG_BD0 | (address & 0xC),
+       return dap_queue_ap_write(ap, MEM_AP_REG_BD0(ap->dap) | (address & 0xC),
                        value);
 }
 
@@ -436,7 +436,7 @@ static int mem_ap_write(struct adiv5_ap *ap, const uint8_t *buffer, uint32_t siz
 
                nbytes -= this_size;
 
-               retval = dap_queue_ap_write(ap, MEM_AP_REG_DRW, outvalue);
+               retval = dap_queue_ap_write(ap, MEM_AP_REG_DRW(dap), outvalue);
                if (retval != ERROR_OK)
                        break;
 
@@ -533,7 +533,7 @@ static int mem_ap_read(struct adiv5_ap *ap, uint8_t *buffer, uint32_t size, uint
                if (retval != ERROR_OK)
                        break;
 
-               retval = dap_queue_ap_read(ap, MEM_AP_REG_DRW, read_ptr++);
+               retval = dap_queue_ap_read(ap, MEM_AP_REG_DRW(dap), read_ptr++);
                if (retval != ERROR_OK)
                        break;
 
@@ -780,7 +780,7 @@ int mem_ap_init(struct adiv5_ap *ap)
 
        /* Set ap->cfg_reg before calling mem_ap_setup_transfer(). */
        /* mem_ap_setup_transfer() needs to know if the MEM_AP supports LPAE. */
-       retval = dap_queue_ap_read(ap, MEM_AP_REG_CFG, &cfg);
+       retval = dap_queue_ap_read(ap, MEM_AP_REG_CFG(dap), &cfg);
        if (retval != ERROR_OK)
                return retval;
 
@@ -795,7 +795,7 @@ int mem_ap_init(struct adiv5_ap *ap)
        if (retval != ERROR_OK)
                return retval;
 
-       retval = dap_queue_ap_read(ap, MEM_AP_REG_CSW, &csw);
+       retval = dap_queue_ap_read(ap, MEM_AP_REG_CSW(dap), &csw);
        if (retval != ERROR_OK)
                return retval;
 
@@ -966,22 +966,57 @@ static const char *ap_type_to_description(enum ap_type type)
        return "Unknown";
 }
 
+bool is_ap_num_valid(struct adiv5_dap *dap, uint64_t ap_num)
+{
+       if (!dap)
+               return false;
+
+       /* no autodetection, by now, so uninitialized is equivalent to ADIv5 for
+        * backward compatibility */
+       if (!is_adiv6(dap)) {
+               if (ap_num > DP_APSEL_MAX)
+                       return false;
+               return true;
+       }
+
+       if (is_adiv6(dap)) {
+               if (ap_num & 0x0fffULL)
+                       return false;
+               if (dap->asize != 0)
+                       if (ap_num & ((~0ULL) << dap->asize))
+                               return false;
+               return true;
+       }
+
+       return false;
+}
+
 /*
  * This function checks the ID for each access port to find the requested Access Port type
+ * It also calls dap_get_ap() to increment the AP refcount
  */
-int dap_find_ap(struct adiv5_dap *dap, enum ap_type type_to_find, struct adiv5_ap **ap_out)
+int dap_find_get_ap(struct adiv5_dap *dap, enum ap_type type_to_find, struct adiv5_ap **ap_out)
 {
-       int ap_num;
+       if (is_adiv6(dap)) {
+               /* TODO: scan the ROM table and detect the AP available */
+               LOG_DEBUG("On ADIv6 we cannot scan all the possible AP");
+               return ERROR_FAIL;
+       }
 
        /* Maximum AP number is 255 since the SELECT register is 8 bits */
-       for (ap_num = 0; ap_num <= DP_APSEL_MAX; ap_num++) {
+       for (unsigned int ap_num = 0; ap_num <= DP_APSEL_MAX; ap_num++) {
+               struct adiv5_ap *ap = dap_get_ap(dap, ap_num);
+               if (!ap)
+                       continue;
 
                /* read the IDR register of the Access Port */
                uint32_t id_val = 0;
 
-               int retval = dap_queue_ap_read(dap_ap(dap, ap_num), AP_REG_IDR, &id_val);
-               if (retval != ERROR_OK)
+               int retval = dap_queue_ap_read(ap, AP_REG_IDR(dap), &id_val);
+               if (retval != ERROR_OK) {
+                       dap_put_ap(ap);
                        return retval;
+               }
 
                retval = dap_run(dap);
 
@@ -993,16 +1028,97 @@ int dap_find_ap(struct adiv5_dap *dap, enum ap_type type_to_find, struct adiv5_a
                                                ap_type_to_description(type_to_find),
                                                ap_num, id_val);
 
-                       *ap_out = &dap->ap[ap_num];
+                       *ap_out = ap;
                        return ERROR_OK;
                }
+               dap_put_ap(ap);
        }
 
        LOG_DEBUG("No %s found", ap_type_to_description(type_to_find));
        return ERROR_FAIL;
 }
 
-int dap_get_debugbase(struct adiv5_ap *ap,
+static inline bool is_ap_in_use(struct adiv5_ap *ap)
+{
+       return ap->refcount > 0 || ap->config_ap_never_release;
+}
+
+static struct adiv5_ap *_dap_get_ap(struct adiv5_dap *dap, uint64_t ap_num)
+{
+       if (!is_ap_num_valid(dap, ap_num)) {
+               LOG_ERROR("Invalid AP#0x%" PRIx64, ap_num);
+               return NULL;
+       }
+       if (is_adiv6(dap)) {
+               for (unsigned int i = 0; i <= DP_APSEL_MAX; i++) {
+                       struct adiv5_ap *ap = &dap->ap[i];
+                       if (is_ap_in_use(ap) && ap->ap_num == ap_num) {
+                               ++ap->refcount;
+                               return ap;
+                       }
+               }
+               for (unsigned int i = 0; i <= DP_APSEL_MAX; i++) {
+                       struct adiv5_ap *ap = &dap->ap[i];
+                       if (!is_ap_in_use(ap)) {
+                               ap->ap_num = ap_num;
+                               ++ap->refcount;
+                               return ap;
+                       }
+               }
+               LOG_ERROR("No more AP available!");
+               return NULL;
+       }
+
+       /* ADIv5 */
+       struct adiv5_ap *ap = &dap->ap[ap_num];
+       ap->ap_num = ap_num;
+       ++ap->refcount;
+       return ap;
+}
+
+/* Return AP with specified ap_num. Increment AP refcount */
+struct adiv5_ap *dap_get_ap(struct adiv5_dap *dap, uint64_t ap_num)
+{
+       struct adiv5_ap *ap = _dap_get_ap(dap, ap_num);
+       if (ap)
+               LOG_DEBUG("refcount AP#0x%" PRIx64 " get %u", ap_num, ap->refcount);
+       return ap;
+}
+
+/* Return AP with specified ap_num. Increment AP refcount and keep it non-zero */
+struct adiv5_ap *dap_get_config_ap(struct adiv5_dap *dap, uint64_t ap_num)
+{
+       struct adiv5_ap *ap = _dap_get_ap(dap, ap_num);
+       if (ap) {
+               ap->config_ap_never_release = true;
+               LOG_DEBUG("refcount AP#0x%" PRIx64 " get_config %u", ap_num, ap->refcount);
+       }
+       return ap;
+}
+
+/* Decrement AP refcount and release the AP when refcount reaches zero */
+int dap_put_ap(struct adiv5_ap *ap)
+{
+       if (ap->refcount == 0) {
+               LOG_ERROR("BUG: refcount AP#0x%" PRIx64 " put underflow", ap->ap_num);
+               return ERROR_FAIL;
+       }
+
+       --ap->refcount;
+
+       LOG_DEBUG("refcount AP#0x%" PRIx64 " put %u", ap->ap_num, ap->refcount);
+       if (!is_ap_in_use(ap)) {
+               /* defaults from dap_instance_init() */
+               ap->ap_num = DP_APSEL_INVALID;
+               ap->memaccess_tck = 255;
+               ap->tar_autoincr_block = (1 << 10);
+               ap->csw_default = CSW_AHB_DEFAULT;
+               ap->cfg_reg = MEM_AP_REG_CFG_INVALID;
+       }
+       return ERROR_OK;
+}
+
+static int dap_get_debugbase(struct adiv5_ap *ap,
                        target_addr_t *dbgbase, uint32_t *apid)
 {
        struct adiv5_dap *dap = ap->dap;
@@ -1010,19 +1126,19 @@ int dap_get_debugbase(struct adiv5_ap *ap,
        uint32_t baseptr_upper, baseptr_lower;
 
        if (ap->cfg_reg == MEM_AP_REG_CFG_INVALID) {
-               retval = dap_queue_ap_read(ap, MEM_AP_REG_CFG, &ap->cfg_reg);
+               retval = dap_queue_ap_read(ap, MEM_AP_REG_CFG(dap), &ap->cfg_reg);
                if (retval != ERROR_OK)
                        return retval;
        }
-       retval = dap_queue_ap_read(ap, MEM_AP_REG_BASE, &baseptr_lower);
+       retval = dap_queue_ap_read(ap, MEM_AP_REG_BASE(dap), &baseptr_lower);
        if (retval != ERROR_OK)
                return retval;
-       retval = dap_queue_ap_read(ap, AP_REG_IDR, apid);
+       retval = dap_queue_ap_read(ap, AP_REG_IDR(dap), apid);
        if (retval != ERROR_OK)
                return retval;
        /* MEM_AP_REG_BASE64 is defined as 'RES0'; can be read and then ignored on 32 bits AP */
        if (ap->cfg_reg == MEM_AP_REG_CFG_INVALID || is_64bit_ap(ap)) {
-               retval = dap_queue_ap_read(ap, MEM_AP_REG_BASE64, &baseptr_upper);
+               retval = dap_queue_ap_read(ap, MEM_AP_REG_BASE64(dap), &baseptr_upper);
                if (retval != ERROR_OK)
                        return retval;
        }
@@ -1038,58 +1154,28 @@ int dap_get_debugbase(struct adiv5_ap *ap,
        return ERROR_OK;
 }
 
-int dap_lookup_cs_component(struct adiv5_ap *ap,
-                       target_addr_t dbgbase, uint8_t type, target_addr_t *addr, int32_t *idx)
+int adiv6_dap_read_baseptr(struct command_invocation *cmd, struct adiv5_dap *dap, uint64_t *baseptr)
 {
-       uint32_t romentry, entry_offset = 0, devtype;
-       target_addr_t component_base;
+       uint32_t baseptr_lower, baseptr_upper = 0;
        int retval;
 
-       dbgbase &= 0xFFFFFFFFFFFFF000ull;
-       *addr = 0;
-
-       do {
-               retval = mem_ap_read_atomic_u32(ap, dbgbase |
-                                               entry_offset, &romentry);
+       if (dap->asize > 32) {
+               retval = dap_queue_dp_read(dap, DP_BASEPTR1, &baseptr_upper);
                if (retval != ERROR_OK)
                        return retval;
+       }
 
-               component_base = dbgbase + (target_addr_t)(romentry & ARM_CS_ROMENTRY_OFFSET_MASK);
-
-               if (romentry & ARM_CS_ROMENTRY_PRESENT) {
-                       uint32_t c_cid1;
-                       retval = mem_ap_read_atomic_u32(ap, component_base + ARM_CS_CIDR1, &c_cid1);
-                       if (retval != ERROR_OK) {
-                               LOG_ERROR("Can't read component with base address " TARGET_ADDR_FMT
-                                         ", the corresponding core might be turned off", component_base);
-                               return retval;
-                       }
-                       unsigned int class = (c_cid1 & ARM_CS_CIDR1_CLASS_MASK) >> ARM_CS_CIDR1_CLASS_SHIFT;
-                       if (class == ARM_CS_CLASS_0X1_ROM_TABLE) {
-                               retval = dap_lookup_cs_component(ap, component_base,
-                                                       type, addr, idx);
-                               if (retval == ERROR_OK)
-                                       break;
-                               if (retval != ERROR_TARGET_RESOURCE_NOT_AVAILABLE)
-                                       return retval;
-                       }
+       retval = dap_dp_read_atomic(dap, DP_BASEPTR0, &baseptr_lower);
+       if (retval != ERROR_OK)
+               return retval;
 
-                       retval = mem_ap_read_atomic_u32(ap, component_base + ARM_CS_C9_DEVTYPE, &devtype);
-                       if (retval != ERROR_OK)
-                               return retval;
-                       if ((devtype & ARM_CS_C9_DEVTYPE_MASK) == type) {
-                               if (!*idx) {
-                                       *addr = component_base;
-                                       break;
-                               } else
-                                       (*idx)--;
-                       }
-               }
-               entry_offset += 4;
-       } while ((romentry > 0) && (entry_offset < 0xf00));
+       if ((baseptr_lower & DP_BASEPTR0_VALID) != DP_BASEPTR0_VALID) {
+               command_print(cmd, "System root table not present");
+               return ERROR_FAIL;
+       }
 
-       if (!*addr)
-               return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+       baseptr_lower &= ~0x0fff;
+       *baseptr = (((uint64_t)baseptr_upper) << 32) | baseptr_lower;
 
        return ERROR_OK;
 }
@@ -1482,39 +1568,150 @@ static int dap_devtype_display(struct command_invocation *cmd, uint32_t devtype)
        return ERROR_OK;
 }
 
+/**
+ * Actions/operations to be executed while parsing ROM tables.
+ */
+struct rtp_ops {
+       /**
+        * Executed at the start of a new MEM-AP, typically to print the MEM-AP header.
+        * @param retval    Error encountered while reading AP.
+        * @param ap        Pointer to AP.
+        * @param dbgbase   Value of MEM-AP Debug Base Address register.
+        * @param apid      Value of MEM-AP IDR Identification Register.
+        * @param depth     The current depth level of ROM table.
+        * @param priv      Pointer to private data.
+        * @return          ERROR_OK on success, else a fault code.
+        */
+       int (*mem_ap_header)(int retval, struct adiv5_ap *ap, uint64_t dbgbase,
+                       uint32_t apid, int depth, void *priv);
+       /**
+        * Executed when a CoreSight component is parsed, typically to print
+        * information on the component.
+        * @param retval    Error encountered while reading component's registers.
+        * @param v         Pointer to a container of the component's registers.
+        * @param depth     The current depth level of ROM table.
+        * @param priv      Pointer to private data.
+        * @return          ERROR_OK on success, else a fault code.
+        */
+       int (*cs_component)(int retval, struct cs_component_vals *v, int depth, void *priv);
+       /**
+        * Executed for each entry of a ROM table, typically to print the entry
+        * and information about validity or end-of-table mark.
+        * @param retval    Error encountered while reading the ROM table entry.
+        * @param depth     The current depth level of ROM table.
+        * @param offset    The offset of the entry in the ROM table.
+        * @param romentry  The value of the ROM table entry.
+        * @param priv      Pointer to private data.
+        * @return          ERROR_OK on success, else a fault code.
+        */
+       int (*rom_table_entry)(int retval, int depth, unsigned int offset, uint64_t romentry,
+                       void *priv);
+       /**
+        * Private data
+        */
+       void *priv;
+};
+
+/**
+ * Wrapper around struct rtp_ops::mem_ap_header.
+ * Input parameter @a retval is propagated.
+ */
+static int rtp_ops_mem_ap_header(const struct rtp_ops *ops,
+               int retval, struct adiv5_ap *ap, uint64_t dbgbase, uint32_t apid, int depth)
+{
+       if (!ops->mem_ap_header)
+               return retval;
+
+       int retval1 = ops->mem_ap_header(retval, ap, dbgbase, apid, depth, ops->priv);
+       if (retval != ERROR_OK)
+               return retval;
+       return retval1;
+}
+
+/**
+ * Wrapper around struct rtp_ops::cs_component.
+ * Input parameter @a retval is propagated.
+ */
+static int rtp_ops_cs_component(const struct rtp_ops *ops,
+               int retval, struct cs_component_vals *v, int depth)
+{
+       if (!ops->cs_component)
+               return retval;
+
+       int retval1 = ops->cs_component(retval, v, depth, ops->priv);
+       if (retval != ERROR_OK)
+               return retval;
+       return retval1;
+}
+
+/**
+ * Wrapper around struct rtp_ops::rom_table_entry.
+ * Input parameter @a retval is propagated.
+ */
+static int rtp_ops_rom_table_entry(const struct rtp_ops *ops,
+               int retval, int depth, unsigned int offset, uint64_t romentry)
+{
+       if (!ops->rom_table_entry)
+               return retval;
+
+       int retval1 = ops->rom_table_entry(retval, depth, offset, romentry, ops->priv);
+       if (retval != ERROR_OK)
+               return retval;
+       return retval1;
+}
+
 /* Broken ROM tables can have circular references. Stop after a while */
 #define ROM_TABLE_MAX_DEPTH (16)
 
-/* TODO: these prototypes will be removed in a following patch */
-static int dap_info_mem_ap_header(struct command_invocation *cmd,
-               int retval, struct adiv5_ap *ap,
-               target_addr_t dbgbase, uint32_t apid);
-static int dap_info_cs_component(struct command_invocation *cmd,
-               int retval, struct cs_component_vals *v, int depth);
-static int dap_info_rom_table_entry(struct command_invocation *cmd,
-               int retval, int depth,
-               unsigned int offset, uint32_t romentry);
-
-static int rtp_cs_component(struct command_invocation *cmd,
+/**
+ * Value used only during lookup of a CoreSight component in ROM table.
+ * Return CORESIGHT_COMPONENT_FOUND when component is found.
+ * Return ERROR_OK when component is not found yet.
+ * Return any other ERROR_* in case of error.
+ */
+#define CORESIGHT_COMPONENT_FOUND (1)
+
+static int rtp_cs_component(const struct rtp_ops *ops,
                struct adiv5_ap *ap, target_addr_t dbgbase, int depth);
 
-static int rtp_rom_loop(struct command_invocation *cmd,
+static int rtp_rom_loop(const struct rtp_ops *ops,
                struct adiv5_ap *ap, target_addr_t base_address, int depth,
-               unsigned int max_entries)
+               unsigned int width, unsigned int max_entries)
 {
        assert(IS_ALIGNED(base_address, ARM_CS_ALIGN));
 
        unsigned int offset = 0;
        while (max_entries--) {
-               uint32_t romentry;
+               uint64_t romentry;
+               uint32_t romentry_low, romentry_high;
+               target_addr_t component_base;
                unsigned int saved_offset = offset;
 
-               int retval = mem_ap_read_atomic_u32(ap, base_address + offset, &romentry);
+               int retval = mem_ap_read_u32(ap, base_address + offset, &romentry_low);
                offset += 4;
-               if (retval != ERROR_OK)
+               if (retval == ERROR_OK && width == 64) {
+                       retval = mem_ap_read_u32(ap, base_address + offset, &romentry_high);
+                       offset += 4;
+               }
+               if (retval == ERROR_OK)
+                       retval = dap_run(ap->dap);
+               if (retval != ERROR_OK) {
                        LOG_DEBUG("Failed read ROM table entry");
+                       return retval;
+               }
 
-               retval = dap_info_rom_table_entry(cmd, retval, depth, saved_offset, romentry);
+               if (width == 64) {
+                       romentry = (((uint64_t)romentry_high) << 32) | romentry_low;
+                       component_base = base_address +
+                               ((((uint64_t)romentry_high) << 32) | (romentry_low & ARM_CS_ROMENTRY_OFFSET_MASK));
+               } else {
+                       romentry = romentry_low;
+                       /* "romentry" is signed */
+                       component_base = base_address + (int32_t)(romentry_low & ARM_CS_ROMENTRY_OFFSET_MASK);
+                       if (!is_64bit_ap(ap))
+                               component_base = (uint32_t)component_base;
+               }
+               retval = rtp_ops_rom_table_entry(ops, retval, depth, saved_offset, romentry);
                if (retval != ERROR_OK)
                        return retval;
 
@@ -1526,9 +1723,10 @@ static int rtp_rom_loop(struct command_invocation *cmd,
                if (!(romentry & ARM_CS_ROMENTRY_PRESENT))
                        continue;
 
-               /* Recurse. "romentry" is signed */
-               target_addr_t component_base = base_address + (int32_t)(romentry & ARM_CS_ROMENTRY_OFFSET_MASK);
-               retval = rtp_cs_component(cmd, ap, component_base, depth + 1);
+               /* Recurse */
+               retval = rtp_cs_component(ops, ap, component_base, depth + 1);
+               if (retval == CORESIGHT_COMPONENT_FOUND)
+                       return CORESIGHT_COMPONENT_FOUND;
                if (retval != ERROR_OK) {
                        /* TODO: do we need to send an ABORT before continuing? */
                        LOG_DEBUG("Ignore error parsing CoreSight component");
@@ -1539,7 +1737,7 @@ static int rtp_rom_loop(struct command_invocation *cmd,
        return ERROR_OK;
 }
 
-static int rtp_cs_component(struct command_invocation *cmd,
+static int rtp_cs_component(const struct rtp_ops *ops,
                struct adiv5_ap *ap, target_addr_t base_address, int depth)
 {
        struct cs_component_vals v;
@@ -1552,7 +1750,9 @@ static int rtp_cs_component(struct command_invocation *cmd,
        else
                retval = rtp_read_cs_regs(ap, base_address, &v);
 
-       retval = dap_info_cs_component(cmd, retval, &v, depth);
+       retval = rtp_ops_cs_component(ops, retval, &v, depth);
+       if (retval == CORESIGHT_COMPONENT_FOUND)
+               return CORESIGHT_COMPONENT_FOUND;
        if (retval != ERROR_OK)
                return ERROR_OK; /* Don't abort recursion */
 
@@ -1562,7 +1762,7 @@ static int rtp_cs_component(struct command_invocation *cmd,
        const unsigned int class = ARM_CS_CIDR_CLASS(v.cid);
 
        if (class == ARM_CS_CLASS_0X1_ROM_TABLE)
-               return rtp_rom_loop(cmd, ap, base_address, depth, 960);
+               return rtp_rom_loop(ops, ap, base_address, depth, 32, 960);
 
        if (class == ARM_CS_CLASS_0X9_CS_COMPONENT) {
                if ((v.devarch & ARM_CS_C9_DEVARCH_PRESENT) == 0)
@@ -1572,24 +1772,27 @@ static int rtp_cs_component(struct command_invocation *cmd,
                if ((v.devarch & DEVARCH_ID_MASK) != DEVARCH_ROM_C_0X9)
                        return ERROR_OK;
 
-               return rtp_rom_loop(cmd, ap, base_address, depth, 512);
+               if ((v.devid & ARM_CS_C9_DEVID_FORMAT_MASK) == ARM_CS_C9_DEVID_FORMAT_64BIT)
+                       return rtp_rom_loop(ops, ap, base_address, depth, 64, 256);
+               else
+                       return rtp_rom_loop(ops, ap, base_address, depth, 32, 512);
        }
 
        /* Class other than 0x1 and 0x9 */
        return ERROR_OK;
 }
 
-int dap_info_command(struct command_invocation *cmd,
-               struct adiv5_ap *ap)
+static int rtp_ap(const struct rtp_ops *ops, struct adiv5_ap *ap, int depth)
 {
        int retval;
        uint32_t apid;
-       target_addr_t dbgbase;
-       target_addr_t invalid_entry;
+       target_addr_t dbgbase, invalid_entry;
 
        /* Now we read ROM table ID registers, ref. ARM IHI 0029B sec  */
        retval = dap_get_debugbase(ap, &dbgbase, &apid);
-       retval = dap_info_mem_ap_header(cmd, retval, ap, dbgbase, apid);
+       if (retval != ERROR_OK)
+               return retval;
+       retval = rtp_ops_mem_ap_header(ops, retval, ap, dbgbase, apid, depth);
        if (retval != ERROR_OK)
                return retval;
 
@@ -1607,8 +1810,11 @@ int dap_info_command(struct command_invocation *cmd,
                else
                        invalid_entry = 0xFFFFFFFFul;
 
-               if (dbgbase != invalid_entry && (dbgbase & 0x3) != 0x2)
-                       rtp_cs_component(cmd, ap, dbgbase & 0xFFFFFFFFFFFFF000ull, 0);
+               if (dbgbase != invalid_entry && (dbgbase & 0x3) != 0x2) {
+                       retval = rtp_cs_component(ops, ap, dbgbase & 0xFFFFFFFFFFFFF000ull, depth);
+                       if (retval == CORESIGHT_COMPONENT_FOUND)
+                               return CORESIGHT_COMPONENT_FOUND;
+               }
        }
 
        return ERROR_OK;
@@ -1616,24 +1822,35 @@ int dap_info_command(struct command_invocation *cmd,
 
 /* Actions for command "dap info" */
 
-static int dap_info_mem_ap_header(struct command_invocation *cmd,
-               int retval, struct adiv5_ap *ap,
-               target_addr_t dbgbase, uint32_t apid)
+static int dap_info_mem_ap_header(int retval, struct adiv5_ap *ap,
+               target_addr_t dbgbase, uint32_t apid, int depth, void *priv)
 {
+       struct command_invocation *cmd = priv;
        target_addr_t invalid_entry;
+       char tabs[17] = "";
 
        if (retval != ERROR_OK) {
                command_print(cmd, "\t\tCan't read MEM-AP, the corresponding core might be turned off");
                return retval;
        }
 
-       command_print(cmd, "AP ID register 0x%8.8" PRIx32, apid);
+       if (depth > ROM_TABLE_MAX_DEPTH) {
+               command_print(cmd, "\tTables too deep");
+               return ERROR_FAIL;
+       }
+
+       if (depth)
+               snprintf(tabs, sizeof(tabs), "\t[L%02d] ", depth);
+
+       command_print(cmd, "%sAP # 0x%" PRIx64, tabs, ap->ap_num);
+
+       command_print(cmd, "\t\tAP ID register 0x%8.8" PRIx32, apid);
        if (apid == 0) {
-               command_print(cmd, "No AP found at this ap 0x%x", ap->ap_num);
+               command_print(cmd, "\t\tNo AP found at this AP#0x%" PRIx64, ap->ap_num);
                return ERROR_FAIL;
        }
 
-       command_print(cmd, "\tType is %s", ap_type_to_description(apid & AP_TYPE_MASK));
+       command_print(cmd, "\t\tType is %s", ap_type_to_description(apid & AP_TYPE_MASK));
 
        /* NOTE: a MEM-AP may have a single CoreSight component that's
         * not a ROM table ... or have no such components at all.
@@ -1646,24 +1863,25 @@ static int dap_info_mem_ap_header(struct command_invocation *cmd,
                else
                        invalid_entry = 0xFFFFFFFFul;
 
-               command_print(cmd, "MEM-AP BASE " TARGET_ADDR_FMT, dbgbase);
+               command_print(cmd, "%sMEM-AP BASE " TARGET_ADDR_FMT, tabs, dbgbase);
 
                if (dbgbase == invalid_entry || (dbgbase & 0x3) == 0x2) {
-                       command_print(cmd, "\tNo ROM table present");
+                       command_print(cmd, "\t\tNo ROM table present");
                } else {
                        if (dbgbase & 0x01)
-                               command_print(cmd, "\tValid ROM table present");
+                               command_print(cmd, "\t\tValid ROM table present");
                        else
-                               command_print(cmd, "\tROM table in legacy format");
+                               command_print(cmd, "\t\tROM table in legacy format");
                }
        }
 
        return ERROR_OK;
 }
 
-static int dap_info_cs_component(struct command_invocation *cmd,
-               int retval, struct cs_component_vals *v, int depth)
+static int dap_info_cs_component(int retval, struct cs_component_vals *v, int depth, void *priv)
 {
+       struct command_invocation *cmd = priv;
+
        if (depth > ROM_TABLE_MAX_DEPTH) {
                command_print(cmd, "\tTables too deep");
                return ERROR_FAIL;
@@ -1745,10 +1963,10 @@ static int dap_info_cs_component(struct command_invocation *cmd,
        return ERROR_OK;
 }
 
-static int dap_info_rom_table_entry(struct command_invocation *cmd,
-               int retval, int depth,
-               unsigned int offset, uint32_t romentry)
+static int dap_info_rom_table_entry(int retval, int depth,
+               unsigned int offset, uint64_t romentry, void *priv)
 {
+       struct command_invocation *cmd = priv;
        char tabs[16] = "";
 
        if (depth)
@@ -1761,7 +1979,7 @@ static int dap_info_rom_table_entry(struct command_invocation *cmd,
                return retval;
        }
 
-       command_print(cmd, "\t%sROMTABLE[0x%x] = 0x%08" PRIx32,
+       command_print(cmd, "\t%sROMTABLE[0x%x] = 0x%08" PRIx64,
                        tabs, offset, romentry);
 
        if (romentry == 0) {
@@ -1777,6 +1995,85 @@ static int dap_info_rom_table_entry(struct command_invocation *cmd,
        return ERROR_OK;
 }
 
+int dap_info_command(struct command_invocation *cmd, struct adiv5_ap *ap)
+{
+       struct rtp_ops dap_info_ops = {
+               .mem_ap_header   = dap_info_mem_ap_header,
+               .cs_component    = dap_info_cs_component,
+               .rom_table_entry = dap_info_rom_table_entry,
+               .priv            = cmd,
+       };
+
+       return rtp_ap(&dap_info_ops, ap, 0);
+}
+
+/* Actions for dap_lookup_cs_component() */
+
+struct dap_lookup_data {
+       /* input */
+       unsigned int idx;
+       unsigned int type;
+       /* output */
+       uint64_t component_base;
+};
+
+static int dap_lookup_cs_component_cs_component(int retval,
+               struct cs_component_vals *v, int depth, void *priv)
+{
+       struct dap_lookup_data *lookup = priv;
+
+       if (retval != ERROR_OK)
+               return retval;
+
+       if (!is_valid_arm_cs_cidr(v->cid))
+               return ERROR_OK;
+
+       const unsigned int class = ARM_CS_CIDR_CLASS(v->cid);
+       if (class != ARM_CS_CLASS_0X9_CS_COMPONENT)
+               return ERROR_OK;
+
+       if ((v->devtype_memtype & ARM_CS_C9_DEVTYPE_MASK) != lookup->type)
+               return ERROR_OK;
+
+       if (lookup->idx) {
+               /* search for next one */
+               --lookup->idx;
+               return ERROR_OK;
+       }
+
+       /* Found! */
+       lookup->component_base = v->component_base;
+       return CORESIGHT_COMPONENT_FOUND;
+}
+
+int dap_lookup_cs_component(struct adiv5_ap *ap, uint8_t type,
+               target_addr_t *addr, int32_t core_id)
+{
+       struct dap_lookup_data lookup = {
+               .type = type,
+               .idx  = core_id,
+       };
+       struct rtp_ops dap_lookup_cs_component_ops = {
+               .mem_ap_header   = NULL,
+               .cs_component    = dap_lookup_cs_component_cs_component,
+               .rom_table_entry = NULL,
+               .priv            = &lookup,
+       };
+
+       int retval = rtp_ap(&dap_lookup_cs_component_ops, ap, 0);
+       if (retval == CORESIGHT_COMPONENT_FOUND) {
+               LOG_DEBUG("CS lookup found at 0x%" PRIx64, lookup.component_base);
+               *addr = lookup.component_base;
+               return ERROR_OK;
+       }
+       if (retval != ERROR_OK) {
+               LOG_DEBUG("CS lookup error %d", retval);
+               return retval;
+       }
+       LOG_DEBUG("CS lookup not found");
+       return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+}
+
 enum adiv5_cfg_param {
        CFG_DAP,
        CFG_AP_NUM,
@@ -1793,8 +2090,10 @@ static const struct jim_nvp nvp_config_opts[] = {
 };
 
 static int adiv5_jim_spot_configure(struct jim_getopt_info *goi,
-               struct adiv5_dap **dap_p, int *ap_num_p, uint32_t *base_p)
+               struct adiv5_dap **dap_p, uint64_t *ap_num_p, uint32_t *base_p)
 {
+       assert(dap_p && ap_num_p);
+
        if (!goi->argc)
                return JIM_OK;
 
@@ -1846,11 +2145,13 @@ static int adiv5_jim_spot_configure(struct jim_getopt_info *goi,
 
        case CFG_AP_NUM:
                if (goi->isconfigure) {
+                       /* jim_wide is a signed 64 bits int, ap_num is unsigned with max 52 bits */
                        jim_wide ap_num;
                        e = jim_getopt_wide(goi, &ap_num);
                        if (e != JIM_OK)
                                return e;
-                       if (ap_num < 0 || ap_num > DP_APSEL_MAX) {
+                       /* we still don't know dap->adi_version */
+                       if (ap_num < 0 || (ap_num > DP_APSEL_MAX && (ap_num & 0xfff))) {
                                Jim_SetResultString(goi->interp, "Invalid AP number!", -1);
                                return JIM_ERR;
                        }
@@ -1899,6 +2200,10 @@ int adiv5_jim_configure(struct target *target, struct jim_getopt_info *goi)
        pc = (struct adiv5_private_config *)target->private_config;
        if (!pc) {
                pc = calloc(1, sizeof(struct adiv5_private_config));
+               if (!pc) {
+                       LOG_ERROR("Out of memory");
+                       return JIM_ERR;
+               }
                pc->ap_num = DP_APSEL_INVALID;
                target->private_config = pc;
        }
@@ -1951,15 +2256,27 @@ int adiv5_mem_ap_spot_init(struct adiv5_mem_ap_spot *p)
 COMMAND_HANDLER(handle_dap_info_command)
 {
        struct adiv5_dap *dap = adiv5_get_dap(CMD_DATA);
-       uint32_t apsel;
+       uint64_t apsel;
 
        switch (CMD_ARGC) {
        case 0:
                apsel = dap->apsel;
                break;
        case 1:
-               COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], apsel);
-               if (apsel > DP_APSEL_MAX) {
+               if (!strcmp(CMD_ARGV[0], "root")) {
+                       if (!is_adiv6(dap)) {
+                               command_print(CMD, "Option \"root\" not allowed with ADIv5 DAP");
+                               return ERROR_COMMAND_ARGUMENT_INVALID;
+                       }
+                       int retval = adiv6_dap_read_baseptr(CMD, dap, &apsel);
+                       if (retval != ERROR_OK) {
+                               command_print(CMD, "Failed reading DAP baseptr");
+                               return retval;
+                       }
+                       break;
+               }
+               COMMAND_PARSE_NUMBER(u64, CMD_ARGV[0], apsel);
+               if (!is_ap_num_valid(dap, apsel)) {
                        command_print(CMD, "Invalid AP number");
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                }
@@ -1968,13 +2285,22 @@ COMMAND_HANDLER(handle_dap_info_command)
                return ERROR_COMMAND_SYNTAX_ERROR;
        }
 
-       return dap_info_command(CMD, &dap->ap[apsel]);
+       struct adiv5_ap *ap = dap_get_ap(dap, apsel);
+       if (!ap) {
+               command_print(CMD, "Cannot get AP");
+               return ERROR_FAIL;
+       }
+
+       int retval = dap_info_command(CMD, ap);
+       dap_put_ap(ap);
+       return retval;
 }
 
 COMMAND_HANDLER(dap_baseaddr_command)
 {
        struct adiv5_dap *dap = adiv5_get_dap(CMD_DATA);
-       uint32_t apsel, baseaddr_lower, baseaddr_upper;
+       uint64_t apsel;
+       uint32_t baseaddr_lower, baseaddr_upper;
        struct adiv5_ap *ap;
        target_addr_t baseaddr;
        int retval;
@@ -1986,9 +2312,8 @@ COMMAND_HANDLER(dap_baseaddr_command)
                apsel = dap->apsel;
                break;
        case 1:
-               COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], apsel);
-               /* AP address is in bits 31:24 of DP_SELECT */
-               if (apsel > DP_APSEL_MAX) {
+               COMMAND_PARSE_NUMBER(u64, CMD_ARGV[0], apsel);
+               if (!is_ap_num_valid(dap, apsel)) {
                        command_print(CMD, "Invalid AP number");
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                }
@@ -2003,19 +2328,25 @@ COMMAND_HANDLER(dap_baseaddr_command)
         * use the ID register to verify it's a MEM-AP.
         */
 
-       ap = dap_ap(dap, apsel);
-       retval = dap_queue_ap_read(ap, MEM_AP_REG_BASE, &baseaddr_lower);
+       ap = dap_get_ap(dap, apsel);
+       if (!ap) {
+               command_print(CMD, "Cannot get AP");
+               return ERROR_FAIL;
+       }
+
+       retval = dap_queue_ap_read(ap, MEM_AP_REG_BASE(dap), &baseaddr_lower);
 
        if (retval == ERROR_OK && ap->cfg_reg == MEM_AP_REG_CFG_INVALID)
-               retval = dap_queue_ap_read(ap, MEM_AP_REG_CFG, &ap->cfg_reg);
+               retval = dap_queue_ap_read(ap, MEM_AP_REG_CFG(dap), &ap->cfg_reg);
 
        if (retval == ERROR_OK && (ap->cfg_reg == MEM_AP_REG_CFG_INVALID || is_64bit_ap(ap))) {
                /* MEM_AP_REG_BASE64 is defined as 'RES0'; can be read and then ignored on 32 bits AP */
-               retval = dap_queue_ap_read(ap, MEM_AP_REG_BASE64, &baseaddr_upper);
+               retval = dap_queue_ap_read(ap, MEM_AP_REG_BASE64(dap), &baseaddr_upper);
        }
 
        if (retval == ERROR_OK)
                retval = dap_run(dap);
+       dap_put_ap(ap);
        if (retval != ERROR_OK)
                return retval;
 
@@ -2031,22 +2362,35 @@ COMMAND_HANDLER(dap_baseaddr_command)
 COMMAND_HANDLER(dap_memaccess_command)
 {
        struct adiv5_dap *dap = adiv5_get_dap(CMD_DATA);
+       struct adiv5_ap *ap;
        uint32_t memaccess_tck;
 
        switch (CMD_ARGC) {
        case 0:
-               memaccess_tck = dap->ap[dap->apsel].memaccess_tck;
+               ap = dap_get_ap(dap, dap->apsel);
+               if (!ap) {
+                       command_print(CMD, "Cannot get AP");
+                       return ERROR_FAIL;
+               }
+               memaccess_tck = ap->memaccess_tck;
                break;
        case 1:
+               ap = dap_get_config_ap(dap, dap->apsel);
+               if (!ap) {
+                       command_print(CMD, "Cannot get AP");
+                       return ERROR_FAIL;
+               }
                COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], memaccess_tck);
+               ap->memaccess_tck = memaccess_tck;
                break;
        default:
                return ERROR_COMMAND_SYNTAX_ERROR;
        }
-       dap->ap[dap->apsel].memaccess_tck = memaccess_tck;
+
+       dap_put_ap(ap);
 
        command_print(CMD, "memory bus access delay set to %" PRIu32 " tck",
-                       dap->ap[dap->apsel].memaccess_tck);
+                       memaccess_tck);
 
        return ERROR_OK;
 }
@@ -2054,16 +2398,15 @@ COMMAND_HANDLER(dap_memaccess_command)
 COMMAND_HANDLER(dap_apsel_command)
 {
        struct adiv5_dap *dap = adiv5_get_dap(CMD_DATA);
-       uint32_t apsel;
+       uint64_t apsel;
 
        switch (CMD_ARGC) {
        case 0:
-               command_print(CMD, "%" PRIu32, dap->apsel);
+               command_print(CMD, "0x%" PRIx64, dap->apsel);
                return ERROR_OK;
        case 1:
-               COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], apsel);
-               /* AP address is in bits 31:24 of DP_SELECT */
-               if (apsel > DP_APSEL_MAX) {
+               COMMAND_PARSE_NUMBER(u64, CMD_ARGV[0], apsel);
+               if (!is_ap_num_valid(dap, apsel)) {
                        command_print(CMD, "Invalid AP number");
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                }
@@ -2079,14 +2422,19 @@ COMMAND_HANDLER(dap_apsel_command)
 COMMAND_HANDLER(dap_apcsw_command)
 {
        struct adiv5_dap *dap = adiv5_get_dap(CMD_DATA);
-       uint32_t apcsw = dap->ap[dap->apsel].csw_default;
+       struct adiv5_ap *ap;
        uint32_t csw_val, csw_mask;
 
        switch (CMD_ARGC) {
        case 0:
-               command_print(CMD, "ap %" PRIu32 " selected, csw 0x%8.8" PRIx32,
-                       dap->apsel, apcsw);
-               return ERROR_OK;
+               ap = dap_get_ap(dap, dap->apsel);
+               if (!ap) {
+                       command_print(CMD, "Cannot get AP");
+                       return ERROR_FAIL;
+               }
+               command_print(CMD, "AP#0x%" PRIx64 " selected, csw 0x%8.8" PRIx32,
+                       dap->apsel, ap->csw_default);
+               break;
        case 1:
                if (strcmp(CMD_ARGV[0], "default") == 0)
                        csw_val = CSW_AHB_DEFAULT;
@@ -2097,7 +2445,12 @@ COMMAND_HANDLER(dap_apcsw_command)
                        LOG_ERROR("CSW value cannot include 'Size' and 'AddrInc' bit-fields");
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                }
-               apcsw = csw_val;
+               ap = dap_get_config_ap(dap, dap->apsel);
+               if (!ap) {
+                       command_print(CMD, "Cannot get AP");
+                       return ERROR_FAIL;
+               }
+               ap->csw_default = csw_val;
                break;
        case 2:
                COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], csw_val);
@@ -2106,14 +2459,19 @@ COMMAND_HANDLER(dap_apcsw_command)
                        LOG_ERROR("CSW mask cannot include 'Size' and 'AddrInc' bit-fields");
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                }
-               apcsw = (apcsw & ~csw_mask) | (csw_val & csw_mask);
+               ap = dap_get_config_ap(dap, dap->apsel);
+               if (!ap) {
+                       command_print(CMD, "Cannot get AP");
+                       return ERROR_FAIL;
+               }
+               ap->csw_default = (ap->csw_default & ~csw_mask) | (csw_val & csw_mask);
                break;
        default:
                return ERROR_COMMAND_SYNTAX_ERROR;
        }
-       dap->ap[dap->apsel].csw_default = apcsw;
+       dap_put_ap(ap);
 
-       return 0;
+       return ERROR_OK;
 }
 
 
@@ -2121,7 +2479,8 @@ COMMAND_HANDLER(dap_apcsw_command)
 COMMAND_HANDLER(dap_apid_command)
 {
        struct adiv5_dap *dap = adiv5_get_dap(CMD_DATA);
-       uint32_t apsel, apid;
+       uint64_t apsel;
+       uint32_t apid;
        int retval;
 
        switch (CMD_ARGC) {
@@ -2129,9 +2488,8 @@ COMMAND_HANDLER(dap_apid_command)
                apsel = dap->apsel;
                break;
        case 1:
-               COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], apsel);
-               /* AP address is in bits 31:24 of DP_SELECT */
-               if (apsel > DP_APSEL_MAX) {
+               COMMAND_PARSE_NUMBER(u64, CMD_ARGV[0], apsel);
+               if (!is_ap_num_valid(dap, apsel)) {
                        command_print(CMD, "Invalid AP number");
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                }
@@ -2140,10 +2498,18 @@ COMMAND_HANDLER(dap_apid_command)
                return ERROR_COMMAND_SYNTAX_ERROR;
        }
 
-       retval = dap_queue_ap_read(dap_ap(dap, apsel), AP_REG_IDR, &apid);
-       if (retval != ERROR_OK)
+       struct adiv5_ap *ap = dap_get_ap(dap, apsel);
+       if (!ap) {
+               command_print(CMD, "Cannot get AP");
+               return ERROR_FAIL;
+       }
+       retval = dap_queue_ap_read(ap, AP_REG_IDR(dap), &apid);
+       if (retval != ERROR_OK) {
+               dap_put_ap(ap);
                return retval;
+       }
        retval = dap_run(dap);
+       dap_put_ap(ap);
        if (retval != ERROR_OK)
                return retval;
 
@@ -2155,38 +2521,47 @@ COMMAND_HANDLER(dap_apid_command)
 COMMAND_HANDLER(dap_apreg_command)
 {
        struct adiv5_dap *dap = adiv5_get_dap(CMD_DATA);
-       uint32_t apsel, reg, value;
-       struct adiv5_ap *ap;
+       uint64_t apsel;
+       uint32_t reg, value;
        int retval;
 
        if (CMD_ARGC < 2 || CMD_ARGC > 3)
                return ERROR_COMMAND_SYNTAX_ERROR;
 
-       COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], apsel);
-       /* AP address is in bits 31:24 of DP_SELECT */
-       if (apsel > DP_APSEL_MAX) {
+       COMMAND_PARSE_NUMBER(u64, CMD_ARGV[0], apsel);
+       if (!is_ap_num_valid(dap, apsel)) {
                command_print(CMD, "Invalid AP number");
                return ERROR_COMMAND_ARGUMENT_INVALID;
        }
 
-       ap = dap_ap(dap, apsel);
-
        COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], reg);
-       if (reg >= 256 || (reg & 3)) {
-               command_print(CMD, "Invalid reg value (should be less than 256 and 4 bytes aligned)");
-               return ERROR_COMMAND_ARGUMENT_INVALID;
+       if (is_adiv6(dap)) {
+               if (reg >= 4096 || (reg & 3)) {
+                       command_print(CMD, "Invalid reg value (should be less than 4096 and 4 bytes aligned)");
+                       return ERROR_COMMAND_ARGUMENT_INVALID;
+               }
+       } else {        /* ADI version 5 */
+               if (reg >= 256 || (reg & 3)) {
+                       command_print(CMD, "Invalid reg value (should be less than 256 and 4 bytes aligned)");
+                       return ERROR_COMMAND_ARGUMENT_INVALID;
+               }
+       }
+
+       struct adiv5_ap *ap = dap_get_ap(dap, apsel);
+       if (!ap) {
+               command_print(CMD, "Cannot get AP");
+               return ERROR_FAIL;
        }
 
        if (CMD_ARGC == 3) {
                COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], value);
-               switch (reg) {
-               case MEM_AP_REG_CSW:
+               /* see if user supplied register address is a match for the CSW or TAR register */
+               if (reg == MEM_AP_REG_CSW(dap)) {
                        ap->csw_value = 0;  /* invalid, in case write fails */
                        retval = dap_queue_ap_write(ap, reg, value);
                        if (retval == ERROR_OK)
                                ap->csw_value = value;
-                       break;
-               case MEM_AP_REG_TAR:
+               } else if (reg == MEM_AP_REG_TAR(dap)) {
                        retval = dap_queue_ap_write(ap, reg, value);
                        if (retval == ERROR_OK)
                                ap->tar_value = (ap->tar_value & ~0xFFFFFFFFull) | value;
@@ -2197,8 +2572,7 @@ COMMAND_HANDLER(dap_apreg_command)
                                /* if tar_valid is false. */
                                ap->tar_valid = false;
                        }
-                       break;
-               case MEM_AP_REG_TAR64:
+               } else if (reg == MEM_AP_REG_TAR64(dap)) {
                        retval = dap_queue_ap_write(ap, reg, value);
                        if (retval == ERROR_OK)
                                ap->tar_value = (ap->tar_value & 0xFFFFFFFFull) | (((target_addr_t)value) << 32);
@@ -2206,10 +2580,8 @@ COMMAND_HANDLER(dap_apreg_command)
                                /* See above comment for the MEM_AP_REG_TAR failed write case */
                                ap->tar_valid = false;
                        }
-                       break;
-               default:
+               } else {
                        retval = dap_queue_ap_write(ap, reg, value);
-                       break;
                }
        } else {
                retval = dap_queue_ap_read(ap, reg, &value);
@@ -2217,6 +2589,8 @@ COMMAND_HANDLER(dap_apreg_command)
        if (retval == ERROR_OK)
                retval = dap_run(dap);
 
+       dap_put_ap(ap);
+
        if (retval != ERROR_OK)
                return retval;
 
@@ -2271,9 +2645,9 @@ const struct command_registration dap_instance_commands[] = {
                .name = "info",
                .handler = handle_dap_info_command,
                .mode = COMMAND_EXEC,
-               .help = "display ROM table for MEM-AP "
-                       "(default currently selected AP)",
-               .usage = "[ap_num]",
+               .help = "display ROM table for specified MEM-AP (default currently selected AP) "
+                       "or the ADIv6 root ROM table",
+               .usage = "[ap_num | 'root']",
        },
        {
                .name = "apsel",

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