+
+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;