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   1 /*
   2  *  linux/arch/arm/mm/proc-v7.S
   3  *
   4  *  Copyright (C) 2001 Deep Blue Solutions Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  This is the "shell" of the ARMv7 processor support.
  11  */
  12 #include <linux/init.h>
  13 #include <linux/linkage.h>
  14 #include <asm/assembler.h>
  15 #include <asm/asm-offsets.h>
  16 #include <asm/hwcap.h>
  17 #include <asm/pgtable-hwdef.h>
  18 #include <asm/pgtable.h>
  19
  20 #include "proc-macros.S"
  21
  22 #define TTB_S           (1 << 1)
  23 #define TTB_RGN_NC      (0 << 3)
  24 #define TTB_RGN_OC_WBWA (1 << 3)
  25 #define TTB_RGN_OC_WT   (2 << 3)
  26 #define TTB_RGN_OC_WB   (3 << 3)
  27 #define TTB_NOS         (1 << 5)
  28 #define TTB_IRGN_NC     ((0 << 0) | (0 << 6))
  29 #define TTB_IRGN_WBWA   ((0 << 0) | (1 << 6))
  30 #define TTB_IRGN_WT     ((1 << 0) | (0 << 6))
  31 #define TTB_IRGN_WB     ((1 << 0) | (1 << 6))
  32
  33 #ifndef CONFIG_SMP
  34 /* PTWs cacheable, inner WB not shareable, outer WB not shareable */
  35 #define TTB_FLAGS       TTB_IRGN_WB|TTB_RGN_OC_WB
  36 #define PMD_FLAGS       PMD_SECT_WB
  37 #else
  38 /* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */
  39 #define TTB_FLAGS       TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA
  40 #define PMD_FLAGS       PMD_SECT_WBWA|PMD_SECT_S
  41 #endif
  42
  43 ENTRY(cpu_v7_proc_init)
  44         mov     pc, lr
  45 ENDPROC(cpu_v7_proc_init)
  46
  47 ENTRY(cpu_v7_proc_fin)
  48         mov     pc, lr
  49 ENDPROC(cpu_v7_proc_fin)
  50
  51 /*
  52  *      cpu_v7_reset(loc)
  53  *
  54  *      Perform a soft reset of the system.  Put the CPU into the
  55  *      same state as it would be if it had been reset, and branch
  56  *      to what would be the reset vector.
  57  *
  58  *      - loc   - location to jump to for soft reset
  59  *
  60  *      It is assumed that:
  61  */
  62         .align  5
  63 ENTRY(cpu_v7_reset)
  64         mov     pc, r0
  65 ENDPROC(cpu_v7_reset)
  66
  67 /*
  68  *      cpu_v7_do_idle()
  69  *
  70  *      Idle the processor (eg, wait for interrupt).
  71  *
  72  *      IRQs are already disabled.
  73  */
  74 ENTRY(cpu_v7_do_idle)
  75         dsb                                     @ WFI may enter a low-power mode
  76         wfi
  77         mov     pc, lr
  78 ENDPROC(cpu_v7_do_idle)
  79
  80 ENTRY(cpu_v7_dcache_clean_area)
  81 #ifndef TLB_CAN_READ_FROM_L1_CACHE
  82         dcache_line_size r2, r3
  83 1:      mcr     p15, 0, r0, c7, c10, 1          @ clean D entry
  84         add     r0, r0, r2
  85         subs    r1, r1, r2
  86         bhi     1b
  87         dsb
  88 #endif
  89         mov     pc, lr
  90 ENDPROC(cpu_v7_dcache_clean_area)
  91
  92 /*
  93  *      cpu_v7_switch_mm(pgd_phys, tsk)
  94  *
  95  *      Set the translation table base pointer to be pgd_phys
  96  *
  97  *      - pgd_phys - physical address of new TTB
  98  *
  99  *      It is assumed that:
 100  *      - we are not using split page tables
 101  */
 102 ENTRY(cpu_v7_switch_mm)
 103 #ifdef CONFIG_MMU
 104         mov     r2, #0
 105         ldr     r1, [r1, #MM_CONTEXT_ID]        @ get mm->context.id
 106         orr     r0, r0, #TTB_FLAGS
 107 #ifdef CONFIG_ARM_ERRATA_430973
 108         mcr     p15, 0, r2, c7, c5, 6           @ flush BTAC/BTB
 109 #endif
 110         mcr     p15, 0, r2, c13, c0, 1          @ set reserved context ID
 111         isb
 112 1:      mcr     p15, 0, r0, c2, c0, 0           @ set TTB 0
 113         isb
 114         mcr     p15, 0, r1, c13, c0, 1          @ set context ID
 115         isb
 116 #endif
 117         mov     pc, lr
 118 ENDPROC(cpu_v7_switch_mm)
 119
 120 /*
 121  *      cpu_v7_set_pte_ext(ptep, pte)
 122  *
 123  *      Set a level 2 translation table entry.
 124  *
 125  *      - ptep  - pointer to level 2 translation table entry
 126  *                (hardware version is stored at -1024 bytes)
 127  *      - pte   - PTE value to store
 128  *      - ext   - value for extended PTE bits
 129  */
 130 ENTRY(cpu_v7_set_pte_ext)
 131 #ifdef CONFIG_MMU
 132  ARM(   str     r1, [r0], #-2048        )       @ linux version
 133  THUMB( str     r1, [r0]                )       @ linux version
 134  THUMB( sub     r0, r0, #2048           )
 135
 136         bic     r3, r1, #0x000003f0
 137         bic     r3, r3, #PTE_TYPE_MASK
 138         orr     r3, r3, r2
 139         orr     r3, r3, #PTE_EXT_AP0 | 2
 140
 141         tst     r1, #1 << 4
 142         orrne   r3, r3, #PTE_EXT_TEX(1)
 143
 144         tst     r1, #L_PTE_WRITE
 145         tstne   r1, #L_PTE_DIRTY
 146         orreq   r3, r3, #PTE_EXT_APX
 147
 148         tst     r1, #L_PTE_USER
 149         orrne   r3, r3, #PTE_EXT_AP1
 150         tstne   r3, #PTE_EXT_APX
 151         bicne   r3, r3, #PTE_EXT_APX | PTE_EXT_AP0
 152
 153         tst     r1, #L_PTE_EXEC
 154         orreq   r3, r3, #PTE_EXT_XN
 155
 156         tst     r1, #L_PTE_YOUNG
 157         tstne   r1, #L_PTE_PRESENT
 158         moveq   r3, #0
 159
 160         str     r3, [r0]
 161         mcr     p15, 0, r0, c7, c10, 1          @ flush_pte
 162 #endif
 163         mov     pc, lr
 164 ENDPROC(cpu_v7_set_pte_ext)
 165
 166 cpu_v7_name:
 167         .ascii  "ARMv7 Processor"
 168         .align
 169
 170         __INIT
 171
 172 /*
 173  *      __v7_setup
 174  *
 175  *      Initialise TLB, Caches, and MMU state ready to switch the MMU
 176  *      on.  Return in r0 the new CP15 C1 control register setting.
 177  *
 178  *      We automatically detect if we have a Harvard cache, and use the
 179  *      Harvard cache control instructions insead of the unified cache
 180  *      control instructions.
 181  *
 182  *      This should be able to cover all ARMv7 cores.
 183  *
 184  *      It is assumed that:
 185  *      - cache type register is implemented
 186  */
 187 __v7_setup:
 188 #ifdef CONFIG_SMP
 189         mrc     p15, 0, r0, c1, c0, 1
 190         tst     r0, #(1 << 6)                   @ SMP/nAMP mode enabled?
 191         orreq   r0, r0, #(1 << 6) | (1 << 0)    @ Enable SMP/nAMP mode and
 192         mcreq   p15, 0, r0, c1, c0, 1           @ TLB ops broadcasting
 193 #endif
 194         adr     r12, __v7_setup_stack           @ the local stack
 195         stmia   r12, {r0-r5, r7, r9, r11, lr}
 196         bl      v7_flush_dcache_all
 197         ldmia   r12, {r0-r5, r7, r9, r11, lr}
 198
 199         mrc     p15, 0, r0, c0, c0, 0           @ read main ID register
 200         and     r10, r0, #0xff000000            @ ARM?
 201         teq     r10, #0x41000000
 202         bne     2f
 203         and     r5, r0, #0x00f00000             @ variant
 204         and     r6, r0, #0x0000000f             @ revision
 205         orr     r0, r6, r5, lsr #20-4           @ combine variant and revision
 206
 207 #ifdef CONFIG_ARM_ERRATA_430973
 208         teq     r5, #0x00100000                 @ only present in r1p*
 209         mrceq   p15, 0, r10, c1, c0, 1          @ read aux control register
 210         orreq   r10, r10, #(1 << 6)             @ set IBE to 1
 211         mcreq   p15, 0, r10, c1, c0, 1          @ write aux control register
 212 #endif
 213 #ifdef CONFIG_ARM_ERRATA_458693
 214         teq     r0, #0x20                       @ only present in r2p0
 215         mrceq   p15, 0, r10, c1, c0, 1          @ read aux control register
 216         orreq   r10, r10, #(1 << 5)             @ set L1NEON to 1
 217         orreq   r10, r10, #(1 << 9)             @ set PLDNOP to 1
 218         mcreq   p15, 0, r10, c1, c0, 1          @ write aux control register
 219 #endif
 220 #ifdef CONFIG_ARM_ERRATA_460075
 221         teq     r0, #0x20                       @ only present in r2p0
 222         mrceq   p15, 1, r10, c9, c0, 2          @ read L2 cache aux ctrl register
 223         tsteq   r10, #1 << 22
 224         orreq   r10, r10, #(1 << 22)            @ set the Write Allocate disable bit
 225         mcreq   p15, 1, r10, c9, c0, 2          @ write the L2 cache aux ctrl register
 226 #endif
 227
 228 2:      mov     r10, #0
 229 #ifdef HARVARD_CACHE
 230         mcr     p15, 0, r10, c7, c5, 0          @ I+BTB cache invalidate
 231 #endif
 232         dsb
 233 #ifdef CONFIG_MMU
 234         mcr     p15, 0, r10, c8, c7, 0          @ invalidate I + D TLBs
 235         mcr     p15, 0, r10, c2, c0, 2          @ TTB control register
 236         orr     r4, r4, #TTB_FLAGS
 237         mcr     p15, 0, r4, c2, c0, 1           @ load TTB1
 238         mov     r10, #0x1f                      @ domains 0, 1 = manager
 239         mcr     p15, 0, r10, c3, c0, 0          @ load domain access register
 240         /*
 241          * Memory region attributes with SCTLR.TRE=1
 242          *
 243          *   n = TEX[0],C,B
 244          *   TR = PRRR[2n+1:2n]         - memory type
 245          *   IR = NMRR[2n+1:2n]         - inner cacheable property
 246          *   OR = NMRR[2n+17:2n+16]     - outer cacheable property
 247          *
 248          *                      n       TR      IR      OR
 249          *   UNCACHED           000     00
 250          *   BUFFERABLE         001     10      00      00
 251          *   WRITETHROUGH       010     10      10      10
 252          *   WRITEBACK          011     10      11      11
 253          *   reserved           110
 254          *   WRITEALLOC         111     10      01      01
 255          *   DEV_SHARED         100     01
 256          *   DEV_NONSHARED      100     01
 257          *   DEV_WC             001     10
 258          *   DEV_CACHED         011     10
 259          *
 260          * Other attributes:
 261          *
 262          *   DS0 = PRRR[16] = 0         - device shareable property
 263          *   DS1 = PRRR[17] = 1         - device shareable property
 264          *   NS0 = PRRR[18] = 0         - normal shareable property
 265          *   NS1 = PRRR[19] = 1         - normal shareable property
 266          *   NOS = PRRR[24+n] = 1       - not outer shareable
 267          */
 268         ldr     r5, =0xff0a81a8                 @ PRRR
 269         ldr     r6, =0x40e040e0                 @ NMRR
 270         mcr     p15, 0, r5, c10, c2, 0          @ write PRRR
 271         mcr     p15, 0, r6, c10, c2, 1          @ write NMRR
 272 #endif
 273         adr     r5, v7_crval
 274         ldmia   r5, {r5, r6}
 275 #ifdef CONFIG_CPU_ENDIAN_BE8
 276         orr     r6, r6, #1 << 25                @ big-endian page tables
 277 #endif
 278         mrc     p15, 0, r0, c1, c0, 0           @ read control register
 279         bic     r0, r0, r5                      @ clear bits them
 280         orr     r0, r0, r6                      @ set them
 281  THUMB( orr     r0, r0, #1 << 30        )       @ Thumb exceptions
 282         mov     pc, lr                          @ return to head.S:__ret
 283 ENDPROC(__v7_setup)
 284
 285         /*   AT
 286          *  TFR   EV X F   I D LR    S
 287          * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
 288          * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
 289          *    1    0 110       0011 1100 .111 1101 < we want
 290          */
 291         .type   v7_crval, #object
 292 v7_crval:
 293         crval   clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c
 294
 295 __v7_setup_stack:
 296         .space  4 * 11                          @ 11 registers
 297
 298         .type   v7_processor_functions, #object
 299 ENTRY(v7_processor_functions)
 300         .word   v7_early_abort
 301         .word   v7_pabort
 302         .word   cpu_v7_proc_init
 303         .word   cpu_v7_proc_fin
 304         .word   cpu_v7_reset
 305         .word   cpu_v7_do_idle
 306         .word   cpu_v7_dcache_clean_area
 307         .word   cpu_v7_switch_mm
 308         .word   cpu_v7_set_pte_ext
 309         .size   v7_processor_functions, . - v7_processor_functions
 310
 311         .type   cpu_arch_name, #object
 312 cpu_arch_name:
 313         .asciz  "armv7"
 314         .size   cpu_arch_name, . - cpu_arch_name
 315
 316         .type   cpu_elf_name, #object
 317 cpu_elf_name:
 318         .asciz  "v7"
 319         .size   cpu_elf_name, . - cpu_elf_name
 320         .align
 321
 322         .section ".proc.info.init", #alloc, #execinstr
 323
 324         /*
 325          * Match any ARMv7 processor core.
 326          */
 327         .type   __v7_proc_info, #object
 328 __v7_proc_info:
 329         .long   0x000f0000              @ Required ID value
 330         .long   0x000f0000              @ Mask for ID
 331         .long   PMD_TYPE_SECT | \
 332                 PMD_SECT_AP_WRITE | \
 333                 PMD_SECT_AP_READ | \
 334                 PMD_FLAGS
 335         .long   PMD_TYPE_SECT | \
 336                 PMD_SECT_XN | \
 337                 PMD_SECT_AP_WRITE | \
 338                 PMD_SECT_AP_READ
 339         b       __v7_setup
 340         .long   cpu_arch_name
 341         .long   cpu_elf_name
 342         .long   HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
 343         .long   cpu_v7_name
 344         .long   v7_processor_functions
 345         .long   v7wbi_tlb_fns
 346         .long   v6_user_fns
 347         .long   v7_cache_fns
 348         .size   __v7_proc_info, . - __v7_proc_info