arch/arm/mm/proc-arm720.S

   1 /*
   2  *  linux/arch/arm/mm/proc-arm720.S: MMU functions for ARM720
   3  *
   4  *  Copyright (C) 2000 Steve Hill (sjhill@cotw.com)
   5  *                     Rob Scott (rscott@mtrob.fdns.net)
   6  *  Copyright (C) 2000 ARM Limited, Deep Blue Solutions Ltd.
   7  *  hacked for non-paged-MM by Hyok S. Choi, 2004.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  *
  24  * These are the low level assembler for performing cache and TLB
  25  * functions on the ARM720T.  The ARM720T has a writethrough IDC
  26  * cache, so we don't need to clean it.
  27  *
  28  *  Changelog:
  29  *   05-09-2000 SJH     Created by moving 720 specific functions
  30  *                      out of 'proc-arm6,7.S' per RMK discussion
  31  *   07-25-2000 SJH     Added idle function.
  32  *   08-25-2000 DBS     Updated for integration of ARM Ltd version.
  33  *   04-20-2004 HSC     modified for non-paged memory management mode.
  34  */
  35 #include <linux/linkage.h>
  36 #include <linux/init.h>
  37 #include <asm/assembler.h>
  38 #include <asm/asm-offsets.h>
  39 #include <asm/hwcap.h>
  40 #include <asm/pgtable-hwdef.h>
  41 #include <asm/pgtable.h>
  42 #include <asm/ptrace.h>
  43
  44 #include "proc-macros.S"
  45
  46 /*
  47  * Function: arm720_proc_init (void)
  48  *         : arm720_proc_fin (void)
  49  *
  50  * Notes   : This processor does not require these
  51  */
  52 ENTRY(cpu_arm720_dcache_clean_area)
  53 ENTRY(cpu_arm720_proc_init)
  54                 ret     lr
  55
  56 ENTRY(cpu_arm720_proc_fin)
  57                 mrc     p15, 0, r0, c1, c0, 0
  58                 bic     r0, r0, #0x1000                 @ ...i............
  59                 bic     r0, r0, #0x000e                 @ ............wca.
  60                 mcr     p15, 0, r0, c1, c0, 0           @ disable caches
  61                 ret     lr
  62
  63 /*
  64  * Function: arm720_proc_do_idle(void)
  65  * Params  : r0 = unused
  66  * Purpose : put the processor in proper idle mode
  67  */
  68 ENTRY(cpu_arm720_do_idle)
  69                 ret     lr
  70
  71 /*
  72  * Function: arm720_switch_mm(unsigned long pgd_phys)
  73  * Params  : pgd_phys   Physical address of page table
  74  * Purpose : Perform a task switch, saving the old process' state and restoring
  75  *           the new.
  76  */
  77 ENTRY(cpu_arm720_switch_mm)
  78 #ifdef CONFIG_MMU
  79                 mov     r1, #0
  80                 mcr     p15, 0, r1, c7, c7, 0           @ invalidate cache
  81                 mcr     p15, 0, r0, c2, c0, 0           @ update page table ptr
  82                 mcr     p15, 0, r1, c8, c7, 0           @ flush TLB (v4)
  83 #endif
  84                 ret     lr
  85
  86 /*
  87  * Function: arm720_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext)
  88  * Params  : r0 = Address to set
  89  *         : r1 = value to set
  90  * Purpose : Set a PTE and flush it out of any WB cache
  91  */
  92         .align  5
  93 ENTRY(cpu_arm720_set_pte_ext)
  94 #ifdef CONFIG_MMU
  95         armv3_set_pte_ext wc_disable=0
  96 #endif
  97         ret     lr
  98
  99 /*
 100  * Function: arm720_reset
 101  * Params  : r0 = address to jump to
 102  * Notes   : This sets up everything for a reset
 103  */
 104                 .pushsection    .idmap.text, "ax"
 105 ENTRY(cpu_arm720_reset)
 106                 mov     ip, #0
 107                 mcr     p15, 0, ip, c7, c7, 0           @ invalidate cache
 108 #ifdef CONFIG_MMU
 109                 mcr     p15, 0, ip, c8, c7, 0           @ flush TLB (v4)
 110 #endif
 111                 mrc     p15, 0, ip, c1, c0, 0           @ get ctrl register
 112                 bic     ip, ip, #0x000f                 @ ............wcam
 113                 bic     ip, ip, #0x2100                 @ ..v....s........
 114                 mcr     p15, 0, ip, c1, c0, 0           @ ctrl register
 115                 ret     r0
 116 ENDPROC(cpu_arm720_reset)
 117                 .popsection
 118
 119         .type   __arm710_setup, #function
 120 __arm710_setup:
 121         mov     r0, #0
 122         mcr     p15, 0, r0, c7, c7, 0           @ invalidate caches
 123 #ifdef CONFIG_MMU
 124         mcr     p15, 0, r0, c8, c7, 0           @ flush TLB (v4)
 125 #endif
 126         mrc     p15, 0, r0, c1, c0              @ get control register
 127         ldr     r5, arm710_cr1_clear
 128         bic     r0, r0, r5
 129         ldr     r5, arm710_cr1_set
 130         orr     r0, r0, r5
 131         ret     lr                              @ __ret (head.S)
 132         .size   __arm710_setup, . - __arm710_setup
 133
 134         /*
 135          *  R
 136          * .RVI ZFRS BLDP WCAM
 137          * .... 0001 ..11 1101
 138          *
 139          */
 140         .type   arm710_cr1_clear, #object
 141         .type   arm710_cr1_set, #object
 142 arm710_cr1_clear:
 143         .word   0x0f3f
 144 arm710_cr1_set:
 145         .word   0x013d
 146
 147         .type   __arm720_setup, #function
 148 __arm720_setup:
 149         mov     r0, #0
 150         mcr     p15, 0, r0, c7, c7, 0           @ invalidate caches
 151 #ifdef CONFIG_MMU
 152         mcr     p15, 0, r0, c8, c7, 0           @ flush TLB (v4)
 153 #endif
 154         adr     r5, arm720_crval
 155         ldmia   r5, {r5, r6}
 156         mrc     p15, 0, r0, c1, c0              @ get control register
 157         bic     r0, r0, r5
 158         orr     r0, r0, r6
 159         ret     lr                              @ __ret (head.S)
 160         .size   __arm720_setup, . - __arm720_setup
 161
 162         /*
 163          *  R
 164          * .RVI ZFRS BLDP WCAM
 165          * ..1. 1001 ..11 1101
 166          *
 167          */
 168         .type   arm720_crval, #object
 169 arm720_crval:
 170         crval   clear=0x00002f3f, mmuset=0x0000213d, ucset=0x00000130
 171
 172                 __INITDATA
 173         @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
 174         define_processor_functions arm720, dabort=v4t_late_abort, pabort=legacy_pabort
 175
 176                 .section ".rodata"
 177
 178         string  cpu_arch_name, "armv4t"
 179         string  cpu_elf_name, "v4"
 180         string  cpu_arm710_name, "ARM710T"
 181         string  cpu_arm720_name, "ARM720T"
 182
 183                 .align
 184
 185 /*
 186  * See <asm/procinfo.h> for a definition of this structure.
 187  */
 188
 189                 .section ".proc.info.init", #alloc
 190
 191 .macro arm720_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req, cpu_flush:req
 192                 .type   __\name\()_proc_info,#object
 193 __\name\()_proc_info:
 194                 .long   \cpu_val
 195                 .long   \cpu_mask
 196                 .long   PMD_TYPE_SECT | \
 197                         PMD_SECT_BUFFERABLE | \
 198                         PMD_SECT_CACHEABLE | \
 199                         PMD_BIT4 | \
 200                         PMD_SECT_AP_WRITE | \
 201                         PMD_SECT_AP_READ
 202                 .long   PMD_TYPE_SECT | \
 203                         PMD_BIT4 | \
 204                         PMD_SECT_AP_WRITE | \
 205                         PMD_SECT_AP_READ
 206                 initfn  \cpu_flush, __\name\()_proc_info        @ cpu_flush
 207                 .long   cpu_arch_name                           @ arch_name
 208                 .long   cpu_elf_name                            @ elf_name
 209                 .long   HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB    @ elf_hwcap
 210                 .long   \cpu_name
 211                 .long   arm720_processor_functions
 212                 .long   v4_tlb_fns
 213                 .long   v4wt_user_fns
 214                 .long   v4_cache_fns
 215                 .size   __\name\()_proc_info, . - __\name\()_proc_info
 216 .endm
 217
 218         arm720_proc_info arm710, 0x41807100, 0xffffff00, cpu_arm710_name, __arm710_setup
 219         arm720_proc_info arm720, 0x41807200, 0xffffff00, cpu_arm720_name, __arm720_setup