[openocd.git] / src / target / armv7a.c

/***************************************************************************
 *    Copyright (C) 2009 by David Brownell                                 *
 *                                                                         *
 *    Copyright (C) ST-Ericsson SA 2011 michel.jaouen@stericsson.com       *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <helper/replacements.h>

#include "armv7a.h"
#include "arm_disassembler.h"

#include "register.h"
#include <helper/binarybuffer.h>
#include <helper/command.h>

#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "arm_opcodes.h"
#include "target.h"
#include "target_type.h"

static void armv7a_show_fault_registers(struct target *target)
{
        uint32_t dfsr, ifsr, dfar, ifar;
        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct arm_dpm *dpm = armv7a->armv4_5_common.dpm;
        int retval;

        retval = dpm->prepare(dpm);
        if (retval != ERROR_OK)
                return;

        /* ARMV4_5_MRC(cpnum, op1, r0, CRn, CRm, op2) */

        /* c5/c0 - {data, instruction} fault status registers */
        retval = dpm->instr_read_data_r0(dpm,
                        ARMV4_5_MRC(15, 0, 0, 5, 0, 0),
                        &dfsr);
        if (retval != ERROR_OK)
                goto done;

        retval = dpm->instr_read_data_r0(dpm,
                        ARMV4_5_MRC(15, 0, 0, 5, 0, 1),
                        &ifsr);
        if (retval != ERROR_OK)
                goto done;

        /* c6/c0 - {data, instruction} fault address registers */
        retval = dpm->instr_read_data_r0(dpm,
                        ARMV4_5_MRC(15, 0, 0, 6, 0, 0),
                        &dfar);
        if (retval != ERROR_OK)
                goto done;

        retval = dpm->instr_read_data_r0(dpm,
                        ARMV4_5_MRC(15, 0, 0, 6, 0, 2),
                        &ifar);
        if (retval != ERROR_OK)
                goto done;

        LOG_USER("Data fault registers        DFSR: %8.8" PRIx32
                        ", DFAR: %8.8" PRIx32, dfsr, dfar);
        LOG_USER("Instruction fault registers IFSR: %8.8" PRIx32
                        ", IFAR: %8.8" PRIx32, ifsr, ifar);

done:
        /* (void) */ dpm->finish(dpm);
}

static int armv7a_read_ttbcr(struct target *target)
{
        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct arm_dpm *dpm = armv7a->armv4_5_common.dpm;
        uint32_t ttbcr;
        int retval = dpm->prepare(dpm);
        if (retval!=ERROR_OK) goto done;
        /*  MRC p15,0,<Rt>,c2,c0,2 ; Read CP15 Translation Table Base Control Register*/
        retval = dpm->instr_read_data_r0(dpm,
                        ARMV4_5_MRC(15, 0, 0, 2, 0, 2),
                        &ttbcr);
        if (retval!=ERROR_OK) goto done;
    armv7a->armv7a_mmu.ttbr1_used = ((ttbcr & 0x7)!=0)? 1: 0;
    armv7a->armv7a_mmu.ttbr0_mask  = 7 << (32 -((ttbcr & 0x7)));
#if 0
    LOG_INFO("ttb1 %s ,ttb0_mask %x",
        armv7a->armv7a_mmu.ttbr1_used ? "used":"not used",
        armv7a->armv7a_mmu.ttbr0_mask);
#endif
        if (armv7a->armv7a_mmu.ttbr1_used == 1)
        {
                LOG_INFO("SVC access above %x",
                                (0xffffffff & armv7a->armv7a_mmu.ttbr0_mask));
                armv7a->armv7a_mmu.os_border = 0xffffffff & armv7a->armv7a_mmu.ttbr0_mask;
        }
        else
        {
                /*  fix me , default is hard coded LINUX border  */
        armv7a->armv7a_mmu.os_border = 0xc0000000;
        }
done:
        dpm->finish(dpm);
        return retval;
}


/*  method adapted to cortex A : reused arm v4 v5 method*/
int armv7a_mmu_translate_va(struct target *target,  uint32_t va, uint32_t *val)
{
        uint32_t first_lvl_descriptor = 0x0;
        uint32_t second_lvl_descriptor = 0x0;
        int retval;
        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct arm_dpm *dpm = armv7a->armv4_5_common.dpm;
        uint32_t ttb = 0; /*  default ttb0 */
        if (armv7a->armv7a_mmu.ttbr1_used == -1) armv7a_read_ttbcr(target);
        if ((armv7a->armv7a_mmu.ttbr1_used) &&
                        (va > (0xffffffff & armv7a->armv7a_mmu.ttbr0_mask)))
        {
                /*  select ttb 1 */
                ttb = 1;
        }
        retval = dpm->prepare(dpm);
        if (retval != ERROR_OK)
                goto done;

        /*  MRC p15,0,<Rt>,c2,c0,ttb */
        retval = dpm->instr_read_data_r0(dpm,
                        ARMV4_5_MRC(15, 0, 0, 2, 0, ttb),
                        &ttb);
        if (retval != ERROR_OK)
                return retval;
        retval = armv7a->armv7a_mmu.read_physical_memory(target,
                        (ttb & 0xffffc000) | ((va & 0xfff00000) >> 18),
                        4, 1, (uint8_t*)&first_lvl_descriptor);
        if (retval != ERROR_OK)
                return retval;
        first_lvl_descriptor = target_buffer_get_u32(target, (uint8_t*)
                        &first_lvl_descriptor);
        /*  reuse armv4_5 piece of code, specific armv7a changes may come later */
        LOG_DEBUG("1st lvl desc: %8.8" PRIx32 "", first_lvl_descriptor);

        if ((first_lvl_descriptor & 0x3) == 0)
        {
                LOG_ERROR("Address translation failure");
                return ERROR_TARGET_TRANSLATION_FAULT;
        }


        if ((first_lvl_descriptor & 0x3) == 2)
        {
                /* section descriptor */
                *val = (first_lvl_descriptor & 0xfff00000) | (va & 0x000fffff);
                return ERROR_OK;
        }

        if ((first_lvl_descriptor & 0x3) == 1)
        {
                /* coarse page table */
                retval = armv7a->armv7a_mmu.read_physical_memory(target,
                                (first_lvl_descriptor & 0xfffffc00) | ((va & 0x000ff000) >> 10),
                                4, 1, (uint8_t*)&second_lvl_descriptor);
                if (retval != ERROR_OK)
                        return retval;
        }
        else if ((first_lvl_descriptor & 0x3) == 3)
        {
                /* fine page table */
                retval = armv7a->armv7a_mmu.read_physical_memory(target,
                                (first_lvl_descriptor & 0xfffff000) | ((va & 0x000ffc00) >> 8),
                                4, 1, (uint8_t*)&second_lvl_descriptor);
                if (retval != ERROR_OK)
                        return retval;
        }

        second_lvl_descriptor = target_buffer_get_u32(target, (uint8_t*)
                        &second_lvl_descriptor);

        LOG_DEBUG("2nd lvl desc: %8.8" PRIx32 "", second_lvl_descriptor);

        if ((second_lvl_descriptor & 0x3) == 0)
        {
                LOG_ERROR("Address translation failure");
                return ERROR_TARGET_TRANSLATION_FAULT;
        }

        if ((second_lvl_descriptor & 0x3) == 1)
        {
                /* large page descriptor */
                *val = (second_lvl_descriptor & 0xffff0000) | (va & 0x0000ffff);
                return ERROR_OK;
        }

        if ((second_lvl_descriptor & 0x3) == 2)
        {
                /* small page descriptor */
                *val = (second_lvl_descriptor & 0xfffff000) | (va & 0x00000fff);
                return ERROR_OK;
        }

        if ((second_lvl_descriptor & 0x3) == 3)
        {
                *val = (second_lvl_descriptor & 0xfffffc00) | (va & 0x000003ff);
                return ERROR_OK;
        }

        /* should not happen */
        LOG_ERROR("Address translation failure");
        return ERROR_TARGET_TRANSLATION_FAULT;

done:
        return retval;
}


/*  V7 method VA TO PA  */
int armv7a_mmu_translate_va_pa(struct target *target, uint32_t va,
                uint32_t *val, int meminfo)
{
        int retval = ERROR_FAIL;
        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct arm_dpm *dpm = armv7a->armv4_5_common.dpm;
        uint32_t virt = va & ~0xfff;
        uint32_t NOS,NS,INNER,OUTER;
        *val = 0xdeadbeef;
        retval = dpm->prepare(dpm);
        if (retval != ERROR_OK)
                goto done;
        /*  mmu must be enable in order to get a correct translation */
        /*  use VA to PA CP15 register for conversion */
        retval = dpm->instr_write_data_r0(dpm,
                        ARMV4_5_MCR(15, 0, 0, 7, 8, 0),
                        virt);
        if (retval!=ERROR_OK) goto done;
        retval = dpm->instr_read_data_r0(dpm,
                        ARMV4_5_MRC(15, 0, 0, 7, 4, 0),
                        val);
        /* decode memory attribute */
        NOS = (*val >> 10) & 1; /*  Not Outer shareable */
        NS = (*val >> 9) & 1; /* Non secure */
        INNER = (*val >> 4) &  0x7;
        OUTER = (*val >> 2) & 0x3;

        if (retval!=ERROR_OK) goto done;
        *val = (*val & ~0xfff)  +  (va & 0xfff);
        if (*val == va)
                LOG_WARNING("virt = phys  : MMU disable !!");
        if (meminfo)
        {
                LOG_INFO("%x : %x %s outer shareable %s secured",
                                va, *val,
                                NOS == 1 ? "not" : " ",
                                NS == 1 ? "not" :"");
                switch (OUTER) {
                case 0 : LOG_INFO("outer: Non-Cacheable");
                                 break;
                case 1 : LOG_INFO("outer: Write-Back, Write-Allocate");
                                 break;
                case 2 : LOG_INFO("outer: Write-Through, No Write-Allocate");
                                 break;
                case 3 : LOG_INFO("outer: Write-Back, no Write-Allocate");
                                 break;
                }
                switch (INNER) {
                case 0 : LOG_INFO("inner: Non-Cacheable");
                                 break;
                case 1 : LOG_INFO("inner: Strongly-ordered");
                                 break;
                case 3 : LOG_INFO("inner: Device");
                                 break;
                case 5 : LOG_INFO("inner: Write-Back, Write-Allocate");
                                 break;
                case 6 : LOG_INFO("inner:  Write-Through");
                                 break;
                case 7 : LOG_INFO("inner: Write-Back, no Write-Allocate");

                default: LOG_INFO("inner: %x ???",INNER);
                }
        }

done:
        dpm->finish(dpm);

        return retval;
}

static int armv7a_handle_inner_cache_info_command(struct command_context *cmd_ctx,
                struct armv7a_cache_common *armv7a_cache)
{
        if (armv7a_cache->ctype == -1)
        {
                command_print(cmd_ctx, "cache not yet identified");
                return ERROR_OK;
        }

        command_print(cmd_ctx,
                        "D-Cache: linelen %i, associativity %i, nsets %i, cachesize %d KBytes",
                        armv7a_cache->d_u_size.linelen,
                        armv7a_cache->d_u_size.associativity,
                        armv7a_cache->d_u_size.nsets,
                        armv7a_cache->d_u_size.cachesize);

        command_print(cmd_ctx,
                        "I-Cache: linelen %i, associativity %i, nsets %i, cachesize %d KBytes",
                        armv7a_cache->i_size.linelen,
                        armv7a_cache->i_size.associativity,
                        armv7a_cache->i_size.nsets,
                        armv7a_cache->i_size.cachesize);

        return ERROR_OK;
}

static int _armv7a_flush_all_data(struct target *target)
{
        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct arm_dpm *dpm = armv7a->armv4_5_common.dpm;
        struct armv7a_cachesize *d_u_size =
                &(armv7a->armv7a_mmu.armv7a_cache.d_u_size);
        int32_t c_way, c_index = d_u_size->index;
        int retval;
        /*  check that cache data is on at target halt */
        if (!armv7a->armv7a_mmu.armv7a_cache.d_u_cache_enabled)
        {
                LOG_INFO("flushed not performed :cache not on at target halt");
                return ERROR_OK;
        }
        retval = dpm->prepare(dpm);
        if (retval != ERROR_OK) goto done;
        do {
                c_way = d_u_size->way;
                do {
                        uint32_t value = (c_index << d_u_size->index_shift)
                                | (c_way << d_u_size->way_shift);
                        /*  DCCISW */
                        //LOG_INFO ("%d %d %x",c_way,c_index,value);
                        retval = dpm->instr_write_data_r0(dpm,
                                        ARMV4_5_MCR(15, 0, 0, 7, 14, 2),
                                        value);
                        if (retval!= ERROR_OK) goto done;
                        c_way -= 1;
                } while (c_way >=0);
                c_index -= 1;
        } while (c_index >=0);
        return retval;
done:
        LOG_ERROR("flushed failed");
        dpm->finish(dpm);
        return retval;
}

static int  armv7a_flush_all_data( struct target * target)
{
        int retval = ERROR_FAIL;
        /*  check that armv7a_cache is correctly identify */
        struct armv7a_common *armv7a = target_to_armv7a(target);
        if (armv7a->armv7a_mmu.armv7a_cache.ctype == -1)
        {
                LOG_ERROR("trying to flush un-identified cache");
                return retval;
        }

        if (target->smp)
        {
                /*  look if all the other target have been flushed in order to flush level
                 *  2 */
                struct target_list *head;
                struct target *curr;
                head = target->head;
                while(head != (struct target_list*)NULL)
                {
                        curr = head->target;
                        if ((curr->state == TARGET_HALTED))
                        {   LOG_INFO("Wait flushing data l1 on core %d",curr->coreid);
                                retval = _armv7a_flush_all_data(curr);
                        }
                        head = head->next;
                }
        }
        else retval = _armv7a_flush_all_data(target);
        return retval;
}


/* L2 is not specific to armv7a  a specific file is needed */
static int armv7a_l2x_flush_all_data(struct target * target)
{

#define L2X0_CLEAN_INV_WAY              0x7FC
        int retval = ERROR_FAIL;
        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct armv7a_l2x_cache *l2x_cache = (struct armv7a_l2x_cache*)
                (armv7a->armv7a_mmu.armv7a_cache.l2_cache);
        uint32_t base = l2x_cache->base;
        uint32_t l2_way = l2x_cache->way;
        uint32_t l2_way_val = (1<<l2_way) -1;
        retval = armv7a_flush_all_data(target);
        if (retval!=ERROR_OK) return retval;
        retval = target->type->write_phys_memory(target,
                        (uint32_t)(base+(uint32_t)L2X0_CLEAN_INV_WAY),
                        (uint32_t)4,
                        (uint32_t)1,
                        (uint8_t*)&l2_way_val);
        return retval;
}

static int armv7a_handle_l2x_cache_info_command(struct command_context *cmd_ctx,
                struct armv7a_cache_common *armv7a_cache)
{

        struct armv7a_l2x_cache *l2x_cache = (struct armv7a_l2x_cache*)
                        (armv7a_cache->l2_cache);

        if (armv7a_cache->ctype == -1)
        {
                command_print(cmd_ctx, "cache not yet identified");
                return ERROR_OK;
        }

        command_print(cmd_ctx,
                        "L1 D-Cache: linelen %i, associativity %i, nsets %i, cachesize %d KBytes",
                armv7a_cache->d_u_size.linelen,
                armv7a_cache->d_u_size.associativity,
                armv7a_cache->d_u_size.nsets,
                armv7a_cache->d_u_size.cachesize);

        command_print(cmd_ctx,
                        "L1 I-Cache: linelen %i, associativity %i, nsets %i, cachesize %d KBytes",
                armv7a_cache->i_size.linelen,
                armv7a_cache->i_size.associativity,
                armv7a_cache->i_size.nsets,
                armv7a_cache->i_size.cachesize);
    command_print(cmd_ctx, "L2 unified cache Base Address 0x%x, %d ways",
                        l2x_cache->base, l2x_cache->way);


        return ERROR_OK;
}


static int armv7a_l2x_cache_init(struct target *target, uint32_t base, uint32_t way)
{
        struct armv7a_l2x_cache *l2x_cache;
        struct target_list *head = target->head;
        struct target *curr;

        struct armv7a_common *armv7a = target_to_armv7a(target);
        l2x_cache = calloc(1, sizeof(struct armv7a_l2x_cache));
        l2x_cache->base = base;
        l2x_cache->way = way;
        /*LOG_INFO("cache l2 initialized base %x  way %d",
        l2x_cache->base,l2x_cache->way);*/
        if (armv7a->armv7a_mmu.armv7a_cache.l2_cache)
        {
                LOG_INFO("cache l2 already initialized\n");
        }
        armv7a->armv7a_mmu.armv7a_cache.l2_cache = (void*) l2x_cache;
        /*  initialize l1 / l2x cache function  */
        armv7a->armv7a_mmu.armv7a_cache.flush_all_data_cache
                = armv7a_l2x_flush_all_data;
        armv7a->armv7a_mmu.armv7a_cache.display_cache_info =
                armv7a_handle_l2x_cache_info_command;
        /*  initialize all target in this cluster (smp target)*/
        /*  l2 cache must be configured after smp declaration */
        while(head != (struct target_list*)NULL)
        {
                curr = head->target;
                if (curr != target)
                {
                        armv7a = target_to_armv7a(curr);
                        if (armv7a->armv7a_mmu.armv7a_cache.l2_cache)
                        {
                                LOG_ERROR("smp target : cache l2 already initialized\n");
                        }
                        armv7a->armv7a_mmu.armv7a_cache.l2_cache = (void*) l2x_cache;
                        armv7a->armv7a_mmu.armv7a_cache.flush_all_data_cache =
                                armv7a_l2x_flush_all_data;
                        armv7a->armv7a_mmu.armv7a_cache.display_cache_info =
                                armv7a_handle_l2x_cache_info_command;
                }
                head = head -> next;
        }
        return JIM_OK;
}

COMMAND_HANDLER(handle_cache_l2x)
{
        struct target *target = get_current_target(CMD_CTX);
    uint32_t base, way;
switch (CMD_ARGC) {
        case 0:
                return ERROR_COMMAND_SYNTAX_ERROR;
                break;
        case 2:
                //command_print(CMD_CTX, "%s %s", CMD_ARGV[0], CMD_ARGV[1]);


                COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], base);
                COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], way);

                /* AP address is in bits 31:24 of DP_SELECT */
                 armv7a_l2x_cache_init(target, base, way);
                break;
        default:
                return ERROR_COMMAND_SYNTAX_ERROR;
        }
return ERROR_OK;
}


int armv7a_handle_cache_info_command(struct command_context *cmd_ctx,
                struct armv7a_cache_common *armv7a_cache)
{
        if (armv7a_cache->ctype == -1)
        {
                command_print(cmd_ctx, "cache not yet identified");
                return ERROR_OK;
        }

        if (armv7a_cache->display_cache_info)
                armv7a_cache->display_cache_info(cmd_ctx, armv7a_cache);
        return ERROR_OK;
}


/*  retrieve core id cluster id  */
static int armv7a_read_mpidr(struct target *target)
{
    int retval = ERROR_FAIL;
        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct arm_dpm *dpm = armv7a->armv4_5_common.dpm;
    uint32_t mpidr;
        retval = dpm->prepare(dpm);
        if (retval!=ERROR_OK) goto done;
        /* MRC p15,0,<Rd>,c0,c0,5; read Multiprocessor ID register*/

        retval = dpm->instr_read_data_r0(dpm,
                        ARMV4_5_MRC(15, 0, 0, 0, 0, 5),
                        &mpidr);
        if (retval!=ERROR_OK) goto done;
    if (mpidr & 1<<31)
        {
                armv7a->multi_processor_system = (mpidr >> 30) & 1;
                armv7a->cluster_id = (mpidr >> 8) & 0xf;
                armv7a->cpu_id = mpidr & 0x3;
                LOG_INFO("%s cluster %x core %x %s", target->cmd_name,
                                armv7a->cluster_id,
                                armv7a->cpu_id,
                                armv7a->multi_processor_system == 0 ? "multi core": "mono core");

        }
        else
        LOG_ERROR("mpdir not in multiprocessor format");

done:
        dpm->finish(dpm);
        return retval;


}


int armv7a_identify_cache(struct target *target)
{
        /*  read cache descriptor */
        int retval = ERROR_FAIL;
        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct arm_dpm *dpm = armv7a->armv4_5_common.dpm;
        uint32_t cache_selected,clidr;
        uint32_t cache_i_reg, cache_d_reg;
        struct armv7a_cache_common *cache = &(armv7a->armv7a_mmu.armv7a_cache);
        armv7a_read_ttbcr(target);
        retval = dpm->prepare(dpm);

        if (retval!=ERROR_OK) goto done;
        /*  retrieve CLIDR */
        /*  mrc p15, 1, r0, c0, c0, 1           @ read clidr */
        retval = dpm->instr_read_data_r0(dpm,
                        ARMV4_5_MRC(15, 1, 0, 0, 0, 1),
                        &clidr);
        if (retval!=ERROR_OK) goto done;
        clidr = (clidr & 0x7000000) >> 23;
        LOG_INFO("number of cache level %d",clidr /2 );
        if ((clidr /2) > 1)
        {
                // FIXME not supported present in cortex A8 and later
                //  in cortex A7, A15
                LOG_ERROR("cache l2 present :not supported");
        }
        /*  retrieve selected cache  */
        /*  MRC p15, 2,<Rd>, c0, c0, 0; Read CSSELR */
        retval = dpm->instr_read_data_r0(dpm,
                        ARMV4_5_MRC(15, 2, 0, 0, 0, 0),
                        &cache_selected);
        if (retval!=ERROR_OK) goto done;

        retval = armv7a->armv4_5_common.mrc(target, 15,
                        2, 0,   /* op1, op2 */
                        0, 0,   /* CRn, CRm */
                        &cache_selected);
        if (retval!=ERROR_OK) goto done;
        /* select instruction cache*/
        /*  MCR p15, 2,<Rd>, c0, c0, 0; Write CSSELR */
        /*  [0]  : 1 instruction cache selection , 0 data cache selection */
        retval = dpm->instr_write_data_r0(dpm,
                        ARMV4_5_MRC(15, 2, 0, 0, 0, 0),
                        1);
        if (retval!=ERROR_OK) goto done;

        /* read CCSIDR*/
        /* MRC P15,1,<RT>,C0, C0,0 ;on cortex A9 read CCSIDR */
        /* [2:0] line size  001 eight word per line */
        /* [27:13] NumSet 0x7f 16KB, 0xff 32Kbytes, 0x1ff 64Kbytes */
        retval = dpm->instr_read_data_r0(dpm,
                        ARMV4_5_MRC(15, 1, 0, 0, 0, 0),
                        &cache_i_reg);
        if (retval!=ERROR_OK) goto done;

        /*  select data cache*/
        retval = dpm->instr_write_data_r0(dpm,
                        ARMV4_5_MRC(15, 2, 0, 0, 0, 0),
                        0);
        if (retval!=ERROR_OK) goto done;

        retval = dpm->instr_read_data_r0(dpm,
                        ARMV4_5_MRC(15, 1, 0, 0, 0, 0),
                        &cache_d_reg);
        if (retval!=ERROR_OK) goto done;

        /*  restore selected cache  */
        dpm->instr_write_data_r0(dpm,
                        ARMV4_5_MRC(15, 2, 0, 0, 0, 0),
                        cache_selected);

        if (retval != ERROR_OK) goto done;
        dpm->finish(dpm);

        // put fake type
        cache->d_u_size.linelen = 16 << (cache_d_reg & 0x7);
        cache->d_u_size.cachesize = (((cache_d_reg >> 13) & 0x7fff)+1)/8;
        cache->d_u_size.nsets = (cache_d_reg >> 13) & 0x7fff;
        cache->d_u_size.associativity = ((cache_d_reg >> 3) & 0x3ff) +1;
        /*  compute info for set way operation on cache */
        cache->d_u_size.index_shift = (cache_d_reg & 0x7) + 4;
    cache->d_u_size.index = (cache_d_reg >> 13) & 0x7fff;
    cache->d_u_size.way = ((cache_d_reg >> 3) & 0x3ff);
        cache->d_u_size.way_shift = cache->d_u_size.way+1;
        {
                int i=0;
                while(((cache->d_u_size.way_shift >> i) & 1)!=1) i++;
                cache->d_u_size.way_shift = 32-i;
        }
    /*LOG_INFO("data cache index %d << %d, way %d << %d",
                        cache->d_u_size.index, cache->d_u_size.index_shift,
                 cache->d_u_size.way,   cache->d_u_size.way_shift);

        LOG_INFO("data cache %d bytes %d KBytes asso %d ways",
                        cache->d_u_size.linelen,
                        cache->d_u_size.cachesize,
                        cache->d_u_size.associativity
                        );*/
        cache->i_size.linelen = 16 << (cache_i_reg & 0x7);
        cache->i_size.associativity = ((cache_i_reg >> 3) & 0x3ff) +1;
        cache->i_size.nsets = (cache_i_reg >> 13) & 0x7fff;
        cache->i_size.cachesize = (((cache_i_reg >> 13) & 0x7fff)+1)/8;
        /*  compute info for set way operation on cache */
        cache->i_size.index_shift = (cache_i_reg & 0x7) + 4;
    cache->i_size.index = (cache_i_reg >> 13) & 0x7fff;
    cache->i_size.way = ((cache_i_reg >> 3) & 0x3ff);
        cache->i_size.way_shift = cache->i_size.way+1;
        {
                int i=0;
                while(((cache->i_size.way_shift >> i) & 1)!=1) i++;
                cache->i_size.way_shift = 32-i;
        }
    /*LOG_INFO("instruction cache index %d << %d, way %d << %d",
                        cache->i_size.index, cache->i_size.index_shift,
                 cache->i_size.way, cache->i_size.way_shift);

        LOG_INFO("instruction cache %d bytes %d KBytes asso %d ways",
                        cache->i_size.linelen,
                        cache->i_size.cachesize,
                        cache->i_size.associativity
                        );*/
        /*  if no l2 cache initialize l1 data cache flush function function */
        if (armv7a->armv7a_mmu.armv7a_cache.flush_all_data_cache == NULL)
        {
                armv7a->armv7a_mmu.armv7a_cache.display_cache_info =
                        armv7a_handle_inner_cache_info_command;
                armv7a->armv7a_mmu.armv7a_cache.flush_all_data_cache =
                        armv7a_flush_all_data;
        }
                armv7a->armv7a_mmu.armv7a_cache.ctype = 0;

done:
        dpm->finish(dpm);
        armv7a_read_mpidr(target);
        return retval;

}



int armv7a_init_arch_info(struct target *target, struct armv7a_common *armv7a)
{
        struct arm *armv4_5 = &armv7a->armv4_5_common;
    armv4_5->arch_info = armv7a;
        target->arch_info = &armv7a->armv4_5_common;
        /*  target is useful in all function arm v4 5 compatible */
        armv7a->armv4_5_common.target = target;
        armv7a->armv4_5_common.common_magic =  ARM_COMMON_MAGIC;
        armv7a->common_magic = ARMV7_COMMON_MAGIC;
        armv7a->armv7a_mmu.armv7a_cache.l2_cache = NULL;
        armv7a->armv7a_mmu.armv7a_cache.ctype = -1;
        armv7a->armv7a_mmu.armv7a_cache.flush_all_data_cache = NULL;
    armv7a->armv7a_mmu.armv7a_cache.display_cache_info = NULL;
        return ERROR_OK;
}

int armv7a_arch_state(struct target *target)
{
        static const char *state[] =
        {
                "disabled", "enabled"
        };

        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct arm *armv4_5 = &armv7a->armv4_5_common;

        if (armv7a->common_magic != ARMV7_COMMON_MAGIC)
        {
                LOG_ERROR("BUG: called for a non-ARMv7A target");
                return ERROR_INVALID_ARGUMENTS;
        }

        arm_arch_state(target);

        LOG_USER("MMU: %s, D-Cache: %s, I-Cache: %s",
                 state[armv7a->armv7a_mmu.mmu_enabled],
                 state[armv7a->armv7a_mmu.armv7a_cache.d_u_cache_enabled],
                 state[armv7a->armv7a_mmu.armv7a_cache.i_cache_enabled]);

        if (armv4_5->core_mode == ARM_MODE_ABT)
                armv7a_show_fault_registers(target);
        if (target->debug_reason == DBG_REASON_WATCHPOINT)
                LOG_USER("Watchpoint triggered at PC %#08x",
                                (unsigned) armv7a->dpm.wp_pc);

        return ERROR_OK;
}

static const struct command_registration l2_cache_commands[] = {
        {
                .name = "l2x",
                .handler = handle_cache_l2x,
                .mode = COMMAND_EXEC,
                .help = "configure l2x cache "
                        "",
                .usage = "[base_addr] [number_of_way]",
        },
                COMMAND_REGISTRATION_DONE

};

const struct command_registration l2x_cache_command_handlers[] = {
        {
                .name = "cache_config",
                .mode = COMMAND_EXEC,
                .help = "cache configuation for a target",
                .chain = l2_cache_commands,
        },
        COMMAND_REGISTRATION_DONE
};


const struct command_registration armv7a_command_handlers[] = {
        {
                .chain = dap_command_handlers,
        },
        {
                .chain = l2x_cache_command_handlers,
        },
        COMMAND_REGISTRATION_DONE
};