arch/powerpc/cpu/mpc85xx/tlb.c

   1 /*
   2  * Copyright 2008-2009 Freescale Semiconductor, Inc.
   3  *
   4  * (C) Copyright 2000
   5  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23  * MA 02111-1307 USA
  24  */
  25
  26 #include <common.h>
  27 #include <asm/processor.h>
  28 #include <asm/mmu.h>
  29 #ifdef CONFIG_ADDR_MAP
  30 #include <addr_map.h>
  31 #endif
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 void invalidate_tlb(u8 tlb)
  36 {
  37         if (tlb == 0)
  38                 mtspr(MMUCSR0, 0x4);
  39         if (tlb == 1)
  40                 mtspr(MMUCSR0, 0x2);
  41 }
  42
  43 void init_tlbs(void)
  44 {
  45         int i;
  46
  47         for (i = 0; i < num_tlb_entries; i++) {
  48                 write_tlb(tlb_table[i].mas0,
  49                           tlb_table[i].mas1,
  50                           tlb_table[i].mas2,
  51                           tlb_table[i].mas3,
  52                           tlb_table[i].mas7);
  53         }
  54
  55         return ;
  56 }
  57
  58 void read_tlbcam_entry(int idx, u32 *valid, u32 *tsize, unsigned long *epn,
  59                        phys_addr_t *rpn)
  60 {
  61         u32 _mas1;
  62
  63         mtspr(MAS0, FSL_BOOKE_MAS0(1, idx, 0));
  64         asm volatile("tlbre;isync");
  65         _mas1 = mfspr(MAS1);
  66
  67         *valid = (_mas1 & MAS1_VALID);
  68         *tsize = (_mas1 >> 8) & 0xf;
  69         *epn = mfspr(MAS2) & MAS2_EPN;
  70         *rpn = mfspr(MAS3) & MAS3_RPN;
  71 #ifdef CONFIG_ENABLE_36BIT_PHYS
  72         *rpn |= ((u64)mfspr(MAS7)) << 32;
  73 #endif
  74 }
  75
  76 #ifndef CONFIG_NAND_SPL
  77 void print_tlbcam(void)
  78 {
  79         int i;
  80         unsigned int num_cam = mfspr(SPRN_TLB1CFG) & 0xfff;
  81
  82         /* walk all the entries */
  83         printf("TLBCAM entries\n");
  84         for (i = 0; i < num_cam; i++) {
  85                 unsigned long epn;
  86                 u32 tsize, valid;
  87                 phys_addr_t rpn;
  88
  89                 read_tlbcam_entry(i, &valid, &tsize, &epn, &rpn);
  90                 printf("entry %02d: V: %d EPN 0x%08x RPN 0x%08llx size:",
  91                         i, (valid == 0) ? 0 : 1, (unsigned int)epn,
  92                         (unsigned long long)rpn);
  93                 print_size(TSIZE_TO_BYTES(tsize), "\n");
  94         }
  95 }
  96
  97 static inline void use_tlb_cam(u8 idx)
  98 {
  99         int i = idx / 32;
 100         int bit = idx % 32;
 101
 102         gd->used_tlb_cams[i] |= (1 << bit);
 103 }
 104
 105 static inline void free_tlb_cam(u8 idx)
 106 {
 107         int i = idx / 32;
 108         int bit = idx % 32;
 109
 110         gd->used_tlb_cams[i] &= ~(1 << bit);
 111 }
 112
 113 void init_used_tlb_cams(void)
 114 {
 115         int i;
 116         unsigned int num_cam = mfspr(SPRN_TLB1CFG) & 0xfff;
 117
 118         for (i = 0; i < ((CONFIG_SYS_NUM_TLBCAMS+31)/32); i++)
 119                 gd->used_tlb_cams[i] = 0;
 120
 121         /* walk all the entries */
 122         for (i = 0; i < num_cam; i++) {
 123                 mtspr(MAS0, FSL_BOOKE_MAS0(1, i, 0));
 124                 asm volatile("tlbre;isync");
 125                 if (mfspr(MAS1) & MAS1_VALID)
 126                         use_tlb_cam(i);
 127         }
 128 }
 129
 130 int find_free_tlbcam(void)
 131 {
 132         int i;
 133         u32 idx;
 134
 135         for (i = 0; i < ((CONFIG_SYS_NUM_TLBCAMS+31)/32); i++) {
 136                 idx = ffz(gd->used_tlb_cams[i]);
 137
 138                 if (idx != 32)
 139                         break;
 140         }
 141
 142         idx += i * 32;
 143
 144         if (idx >= CONFIG_SYS_NUM_TLBCAMS)
 145                 return -1;
 146
 147         return idx;
 148 }
 149
 150 void set_tlb(u8 tlb, u32 epn, u64 rpn,
 151              u8 perms, u8 wimge,
 152              u8 ts, u8 esel, u8 tsize, u8 iprot)
 153 {
 154         u32 _mas0, _mas1, _mas2, _mas3, _mas7;
 155
 156         if (tlb == 1)
 157                 use_tlb_cam(esel);
 158
 159         _mas0 = FSL_BOOKE_MAS0(tlb, esel, 0);
 160         _mas1 = FSL_BOOKE_MAS1(1, iprot, 0, ts, tsize);
 161         _mas2 = FSL_BOOKE_MAS2(epn, wimge);
 162         _mas3 = FSL_BOOKE_MAS3(rpn, 0, perms);
 163         _mas7 = FSL_BOOKE_MAS7(rpn);
 164
 165         write_tlb(_mas0, _mas1, _mas2, _mas3, _mas7);
 166
 167 #ifdef CONFIG_ADDR_MAP
 168         if ((tlb == 1) && (gd->flags & GD_FLG_RELOC))
 169                 addrmap_set_entry(epn, rpn, TSIZE_TO_BYTES(tsize), esel);
 170 #endif
 171 }
 172
 173 void disable_tlb(u8 esel)
 174 {
 175         u32 _mas0, _mas1, _mas2, _mas3, _mas7;
 176
 177         free_tlb_cam(esel);
 178
 179         _mas0 = FSL_BOOKE_MAS0(1, esel, 0);
 180         _mas1 = 0;
 181         _mas2 = 0;
 182         _mas3 = 0;
 183         _mas7 = 0;
 184
 185         mtspr(MAS0, _mas0);
 186         mtspr(MAS1, _mas1);
 187         mtspr(MAS2, _mas2);
 188         mtspr(MAS3, _mas3);
 189 #ifdef CONFIG_ENABLE_36BIT_PHYS
 190         mtspr(MAS7, _mas7);
 191 #endif
 192         asm volatile("isync;msync;tlbwe;isync");
 193
 194 #ifdef CONFIG_ADDR_MAP
 195         if (gd->flags & GD_FLG_RELOC)
 196                 addrmap_set_entry(0, 0, 0, esel);
 197 #endif
 198 }
 199
 200 static void tlbsx (const volatile unsigned *addr)
 201 {
 202         __asm__ __volatile__ ("tlbsx 0,%0" : : "r" (addr), "m" (*addr));
 203 }
 204
 205 /* return -1 if we didn't find anything */
 206 int find_tlb_idx(void *addr, u8 tlbsel)
 207 {
 208         u32 _mas0, _mas1;
 209
 210         /* zero out Search PID, AS */
 211         mtspr(MAS6, 0);
 212
 213         tlbsx(addr);
 214
 215         _mas0 = mfspr(MAS0);
 216         _mas1 = mfspr(MAS1);
 217
 218         /* we found something, and its in the TLB we expect */
 219         if ((MAS1_VALID & _mas1) &&
 220                 (MAS0_TLBSEL(tlbsel) == (_mas0 & MAS0_TLBSEL_MSK))) {
 221                 return ((_mas0 & MAS0_ESEL_MSK) >> 16);
 222         }
 223
 224         return -1;
 225 }
 226
 227 #ifdef CONFIG_ADDR_MAP
 228 void init_addr_map(void)
 229 {
 230         int i;
 231         unsigned int num_cam = mfspr(SPRN_TLB1CFG) & 0xfff;
 232
 233         /* walk all the entries */
 234         for (i = 0; i < num_cam; i++) {
 235                 unsigned long epn;
 236                 u32 tsize, valid;
 237                 phys_addr_t rpn;
 238
 239                 read_tlbcam_entry(i, &valid, &tsize, &epn, &rpn);
 240                 if (valid & MAS1_VALID)
 241                         addrmap_set_entry(epn, rpn, TSIZE_TO_BYTES(tsize), i);
 242         }
 243
 244         return ;
 245 }
 246 #endif
 247
 248 unsigned int setup_ddr_tlbs(unsigned int memsize_in_meg)
 249 {
 250         int i;
 251         unsigned int tlb_size;
 252         unsigned int ram_tlb_address = (unsigned int)CONFIG_SYS_DDR_SDRAM_BASE;
 253         unsigned int max_cam = (mfspr(SPRN_TLB1CFG) >> 16) & 0xf;
 254         u64 size, memsize = (u64)memsize_in_meg << 20;
 255
 256         size = min(memsize, CONFIG_MAX_MEM_MAPPED);
 257
 258         /* Convert (4^max) kB to (2^max) bytes */
 259         max_cam = max_cam * 2 + 10;
 260
 261         for (i = 0; size && i < 8; i++) {
 262                 int ram_tlb_index = find_free_tlbcam();
 263                 u32 camsize = __ilog2_u64(size) & ~1U;
 264                 u32 align = __ilog2(ram_tlb_address) & ~1U;
 265
 266                 if (ram_tlb_index == -1)
 267                         break;
 268
 269                 if (align == -2) align = max_cam;
 270                 if (camsize > align)
 271                         camsize = align;
 272
 273                 if (camsize > max_cam)
 274                         camsize = max_cam;
 275
 276                 tlb_size = (camsize - 10) / 2;
 277
 278                 set_tlb(1, ram_tlb_address, ram_tlb_address,
 279                         MAS3_SX|MAS3_SW|MAS3_SR, 0,
 280                         0, ram_tlb_index, tlb_size, 1);
 281
 282                 size -= 1ULL << camsize;
 283                 memsize -= 1ULL << camsize;
 284                 ram_tlb_address += 1UL << camsize;
 285         }
 286
 287         if (memsize)
 288                 print_size(memsize, " left unmapped\n");
 289
 290         /*
 291          * Confirm that the requested amount of memory was mapped.
 292          */
 293         return memsize_in_meg;
 294 }
 295 #endif /* !CONFIG_NAND_SPL */