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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         stmfd   sp!, {lr}
  49         cpsid   if                              @ disable interrupts
  50         bl      v7_flush_kern_cache_all
  51         mrc     p15, 0, r0, c1, c0, 0           @ ctrl register
  52         bic     r0, r0, #0x1000                 @ ...i............
  53         bic     r0, r0, #0x0006                 @ .............ca.
  54         mcr     p15, 0, r0, c1, c0, 0           @ disable caches
  55         ldmfd   sp!, {pc}
  56 ENDPROC(cpu_v7_proc_fin)
  57
  58 /*
  59  *      cpu_v7_reset(loc)
  60  *
  61  *      Perform a soft reset of the system.  Put the CPU into the
  62  *      same state as it would be if it had been reset, and branch
  63  *      to what would be the reset vector.
  64  *
  65  *      - loc   - location to jump to for soft reset
  66  *
  67  *      It is assumed that:
  68  */
  69         .align  5
  70 ENTRY(cpu_v7_reset)
  71         mov     pc, r0
  72 ENDPROC(cpu_v7_reset)
  73
  74 /*
  75  *      cpu_v7_do_idle()
  76  *
  77  *      Idle the processor (eg, wait for interrupt).
  78  *
  79  *      IRQs are already disabled.
  80  */
  81 ENTRY(cpu_v7_do_idle)
  82         dsb                                     @ WFI may enter a low-power mode
  83         wfi
  84         mov     pc, lr
  85 ENDPROC(cpu_v7_do_idle)
  86
  87 ENTRY(cpu_v7_dcache_clean_area)
  88 #ifndef TLB_CAN_READ_FROM_L1_CACHE
  89         dcache_line_size r2, r3
  90 1:      mcr     p15, 0, r0, c7, c10, 1          @ clean D entry
  91         add     r0, r0, r2
  92         subs    r1, r1, r2
  93         bhi     1b
  94         dsb
  95 #endif
  96         mov     pc, lr
  97 ENDPROC(cpu_v7_dcache_clean_area)
  98
  99 /*
 100  *      cpu_v7_switch_mm(pgd_phys, tsk)
 101  *
 102  *      Set the translation table base pointer to be pgd_phys
 103  *
 104  *      - pgd_phys - physical address of new TTB
 105  *
 106  *      It is assumed that:
 107  *      - we are not using split page tables
 108  */
 109 ENTRY(cpu_v7_switch_mm)
 110 #ifdef CONFIG_MMU
 111         mov     r2, #0
 112         ldr     r1, [r1, #MM_CONTEXT_ID]        @ get mm->context.id
 113         orr     r0, r0, #TTB_FLAGS
 114 #ifdef CONFIG_ARM_ERRATA_430973
 115         mcr     p15, 0, r2, c7, c5, 6           @ flush BTAC/BTB
 116 #endif
 117         mcr     p15, 0, r2, c13, c0, 1          @ set reserved context ID
 118         isb
 119 1:      mcr     p15, 0, r0, c2, c0, 0           @ set TTB 0
 120         isb
 121         mcr     p15, 0, r1, c13, c0, 1          @ set context ID
 122         isb
 123 #endif
 124         mov     pc, lr
 125 ENDPROC(cpu_v7_switch_mm)
 126
 127 /*
 128  *      cpu_v7_set_pte_ext(ptep, pte)
 129  *
 130  *      Set a level 2 translation table entry.
 131  *
 132  *      - ptep  - pointer to level 2 translation table entry
 133  *                (hardware version is stored at -1024 bytes)
 134  *      - pte   - PTE value to store
 135  *      - ext   - value for extended PTE bits
 136  */
 137 ENTRY(cpu_v7_set_pte_ext)
 138 #ifdef CONFIG_MMU
 139  ARM(   str     r1, [r0], #-2048        )       @ linux version
 140  THUMB( str     r1, [r0]                )       @ linux version
 141  THUMB( sub     r0, r0, #2048           )
 142
 143         bic     r3, r1, #0x000003f0
 144         bic     r3, r3, #PTE_TYPE_MASK
 145         orr     r3, r3, r2
 146         orr     r3, r3, #PTE_EXT_AP0 | 2
 147
 148         tst     r1, #1 << 4
 149         orrne   r3, r3, #PTE_EXT_TEX(1)
 150
 151         tst     r1, #L_PTE_WRITE
 152         tstne   r1, #L_PTE_DIRTY
 153         orreq   r3, r3, #PTE_EXT_APX
 154
 155         tst     r1, #L_PTE_USER
 156         orrne   r3, r3, #PTE_EXT_AP1
 157         tstne   r3, #PTE_EXT_APX
 158         bicne   r3, r3, #PTE_EXT_APX | PTE_EXT_AP0
 159
 160         tst     r1, #L_PTE_EXEC
 161         orreq   r3, r3, #PTE_EXT_XN
 162
 163         tst     r1, #L_PTE_YOUNG
 164         tstne   r1, #L_PTE_PRESENT
 165         moveq   r3, #0
 166
 167         str     r3, [r0]
 168         mcr     p15, 0, r0, c7, c10, 1          @ flush_pte
 169 #endif
 170         mov     pc, lr
 171 ENDPROC(cpu_v7_set_pte_ext)
 172
 173 cpu_v7_name:
 174         .ascii  "ARMv7 Processor"
 175         .align
 176
 177         __INIT
 178
 179 /*
 180  *      __v7_setup
 181  *
 182  *      Initialise TLB, Caches, and MMU state ready to switch the MMU
 183  *      on.  Return in r0 the new CP15 C1 control register setting.
 184  *
 185  *      We automatically detect if we have a Harvard cache, and use the
 186  *      Harvard cache control instructions insead of the unified cache
 187  *      control instructions.
 188  *
 189  *      This should be able to cover all ARMv7 cores.
 190  *
 191  *      It is assumed that:
 192  *      - cache type register is implemented
 193  */
 194 __v7_setup:
 195 #ifdef CONFIG_SMP
 196         mrc     p15, 0, r0, c1, c0, 1
 197         tst     r0, #(1 << 6)                   @ SMP/nAMP mode enabled?
 198         orreq   r0, r0, #(1 << 6) | (1 << 0)    @ Enable SMP/nAMP mode and
 199         mcreq   p15, 0, r0, c1, c0, 1           @ TLB ops broadcasting
 200 #endif
 201         adr     r12, __v7_setup_stack           @ the local stack
 202         stmia   r12, {r0-r5, r7, r9, r11, lr}
 203         bl      v7_flush_dcache_all
 204         ldmia   r12, {r0-r5, r7, r9, r11, lr}
 205
 206         mrc     p15, 0, r0, c0, c0, 0           @ read main ID register
 207         and     r10, r0, #0xff000000            @ ARM?
 208         teq     r10, #0x41000000
 209         bne     2f
 210         and     r5, r0, #0x00f00000             @ variant
 211         and     r6, r0, #0x0000000f             @ revision
 212         orr     r0, r6, r5, lsr #20-4           @ combine variant and revision
 213
 214 #ifdef CONFIG_ARM_ERRATA_430973
 215         teq     r5, #0x00100000                 @ only present in r1p*
 216         mrceq   p15, 0, r10, c1, c0, 1          @ read aux control register
 217         orreq   r10, r10, #(1 << 6)             @ set IBE to 1
 218         mcreq   p15, 0, r10, c1, c0, 1          @ write aux control register
 219 #endif
 220 #ifdef CONFIG_ARM_ERRATA_458693
 221         teq     r0, #0x20                       @ only present in r2p0
 222         mrceq   p15, 0, r10, c1, c0, 1          @ read aux control register
 223         orreq   r10, r10, #(1 << 5)             @ set L1NEON to 1
 224         orreq   r10, r10, #(1 << 9)             @ set PLDNOP to 1
 225         mcreq   p15, 0, r10, c1, c0, 1          @ write aux control register
 226 #endif
 227 #ifdef CONFIG_ARM_ERRATA_460075
 228         teq     r0, #0x20                       @ only present in r2p0
 229         mrceq   p15, 1, r10, c9, c0, 2          @ read L2 cache aux ctrl register
 230         tsteq   r10, #1 << 22
 231         orreq   r10, r10, #(1 << 22)            @ set the Write Allocate disable bit
 232         mcreq   p15, 1, r10, c9, c0, 2          @ write the L2 cache aux ctrl register
 233 #endif
 234
 235 2:      mov     r10, #0
 236 #ifdef HARVARD_CACHE
 237         mcr     p15, 0, r10, c7, c5, 0          @ I+BTB cache invalidate
 238 #endif
 239         dsb
 240 #ifdef CONFIG_MMU
 241         mcr     p15, 0, r10, c8, c7, 0          @ invalidate I + D TLBs
 242         mcr     p15, 0, r10, c2, c0, 2          @ TTB control register
 243         orr     r4, r4, #TTB_FLAGS
 244         mcr     p15, 0, r4, c2, c0, 1           @ load TTB1
 245         mov     r10, #0x1f                      @ domains 0, 1 = manager
 246         mcr     p15, 0, r10, c3, c0, 0          @ load domain access register
 247         /*
 248          * Memory region attributes with SCTLR.TRE=1
 249          *
 250          *   n = TEX[0],C,B
 251          *   TR = PRRR[2n+1:2n]         - memory type
 252          *   IR = NMRR[2n+1:2n]         - inner cacheable property
 253          *   OR = NMRR[2n+17:2n+16]     - outer cacheable property
 254          *
 255          *                      n       TR      IR      OR
 256          *   UNCACHED           000     00
 257          *   BUFFERABLE         001     10      00      00
 258          *   WRITETHROUGH       010     10      10      10
 259          *   WRITEBACK          011     10      11      11
 260          *   reserved           110
 261          *   WRITEALLOC         111     10      01      01
 262          *   DEV_SHARED         100     01
 263          *   DEV_NONSHARED      100     01
 264          *   DEV_WC             001     10
 265          *   DEV_CACHED         011     10
 266          *
 267          * Other attributes:
 268          *
 269          *   DS0 = PRRR[16] = 0         - device shareable property
 270          *   DS1 = PRRR[17] = 1         - device shareable property
 271          *   NS0 = PRRR[18] = 0         - normal shareable property
 272          *   NS1 = PRRR[19] = 1         - normal shareable property
 273          *   NOS = PRRR[24+n] = 1       - not outer shareable
 274          */
 275         ldr     r5, =0xff0a81a8                 @ PRRR
 276         ldr     r6, =0x40e040e0                 @ NMRR
 277         mcr     p15, 0, r5, c10, c2, 0          @ write PRRR
 278         mcr     p15, 0, r6, c10, c2, 1          @ write NMRR
 279 #endif
 280         adr     r5, v7_crval
 281         ldmia   r5, {r5, r6}
 282 #ifdef CONFIG_CPU_ENDIAN_BE8
 283         orr     r6, r6, #1 << 25                @ big-endian page tables
 284 #endif
 285         mrc     p15, 0, r0, c1, c0, 0           @ read control register
 286         bic     r0, r0, r5                      @ clear bits them
 287         orr     r0, r0, r6                      @ set them
 288  THUMB( orr     r0, r0, #1 << 30        )       @ Thumb exceptions
 289         mov     pc, lr                          @ return to head.S:__ret
 290 ENDPROC(__v7_setup)
 291
 292         /*   AT
 293          *  TFR   EV X F   I D LR    S
 294          * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
 295          * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
 296          *    1    0 110       0011 1100 .111 1101 < we want
 297          */
 298         .type   v7_crval, #object
 299 v7_crval:
 300         crval   clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c
 301
 302 __v7_setup_stack:
 303         .space  4 * 11                          @ 11 registers
 304
 305         .type   v7_processor_functions, #object
 306 ENTRY(v7_processor_functions)
 307         .word   v7_early_abort
 308         .word   v7_pabort
 309         .word   cpu_v7_proc_init
 310         .word   cpu_v7_proc_fin
 311         .word   cpu_v7_reset
 312         .word   cpu_v7_do_idle
 313         .word   cpu_v7_dcache_clean_area
 314         .word   cpu_v7_switch_mm
 315         .word   cpu_v7_set_pte_ext
 316         .size   v7_processor_functions, . - v7_processor_functions
 317
 318         .type   cpu_arch_name, #object
 319 cpu_arch_name:
 320         .asciz  "armv7"
 321         .size   cpu_arch_name, . - cpu_arch_name
 322
 323         .type   cpu_elf_name, #object
 324 cpu_elf_name:
 325         .asciz  "v7"
 326         .size   cpu_elf_name, . - cpu_elf_name
 327         .align
 328
 329         .section ".proc.info.init", #alloc, #execinstr
 330
 331         /*
 332          * Match any ARMv7 processor core.
 333          */
 334         .type   __v7_proc_info, #object
 335 __v7_proc_info:
 336         .long   0x000f0000              @ Required ID value
 337         .long   0x000f0000              @ Mask for ID
 338         .long   PMD_TYPE_SECT | \
 339                 PMD_SECT_AP_WRITE | \
 340                 PMD_SECT_AP_READ | \
 341                 PMD_FLAGS
 342         .long   PMD_TYPE_SECT | \
 343                 PMD_SECT_XN | \
 344                 PMD_SECT_AP_WRITE | \
 345                 PMD_SECT_AP_READ
 346         b       __v7_setup
 347         .long   cpu_arch_name
 348         .long   cpu_elf_name
 349         .long   HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
 350         .long   cpu_v7_name
 351         .long   v7_processor_functions
 352         .long   v7wbi_tlb_fns
 353         .long   v6_user_fns
 354         .long   v7_cache_fns
 355         .size   __v7_proc_info, . - __v7_proc_info