/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* linux / arch / arm / mm / proc - arm720 . S : MMU functions for ARM720
*
* Copyright ( C ) 2000 Steve Hill ( sjhill @ cotw . com )
* Rob Scott ( rscott @ mtrob . fdns . net )
* Copyright ( C ) 2000 ARM Limited , Deep Blue Solutions Ltd .
* hacked for non - paged - MM by Hyok S . Choi , 2004 .
*
* These are the low level assembler for performing cache and TLB
* functions on the ARM720T . The ARM720T has a writethrough IDC
* cache , so we don ' t need to clean it .
*
* Changelog :
* 05 - 09 - 2000 SJH Created by moving 720 specific functions
* out of ' proc - arm6 , 7 . S ' per RMK discussion
* 07 - 25 - 2000 SJH Added idle function .
* 08 - 25 - 2000 DBS Updated for integration of ARM Ltd version .
* 04 - 20 - 2004 HSC modified for non - paged memory management mode .
*/
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/cfi_types.h>
#include <linux/pgtable.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/hwcap.h>
#include <asm/pgtable-hwdef.h>
#include <asm/ptrace.h>
#include "proc-macros.S"
/*
* Function : arm720_proc_init ( void )
* : arm720_proc_fin ( void )
*
* Notes : This processor does not require these
*/
SYM_TYPED_FUNC_START(cpu_arm720_dcache_clean_area)
ret lr
SYM_FUNC_END(cpu_arm720_dcache_clean_area)
SYM_TYPED_FUNC_START(cpu_arm720_proc_init)
ret lr
SYM_FUNC_END(cpu_arm720_proc_init)
SYM_TYPED_FUNC_START(cpu_arm720_proc_fin)
mrc p15, 0 , r0, c1, c0, 0
bic r0, r0, #0 x1000 @ ...i............
bic r0, r0, #0 x000e @ ............wca.
mcr p15, 0 , r0, c1, c0, 0 @ disable caches
ret lr
SYM_FUNC_END(cpu_arm720_proc_fin)
/*
* Function : arm720_proc_do_idle ( void )
* Params : r0 = unused
* Purpose : put the processor in proper idle mode
*/
SYM_TYPED_FUNC_START(cpu_arm720_do_idle)
ret lr
SYM_FUNC_END(cpu_arm720_do_idle)
/*
* Function : arm720_switch_mm ( unsigned long pgd_phys )
* Params : pgd_phys Physical address of page table
* Purpose : Perform a task switch , saving the old process ' state and restoring
* the new .
*/
SYM_TYPED_FUNC_START(cpu_arm720_switch_mm)
#ifdef CONFIG_MMU
mov r1, #0
mcr p15, 0 , r1, c7, c7, 0 @ invalidate cache
mcr p15, 0 , r0, c2, c0, 0 @ update page table ptr
mcr p15, 0 , r1, c8, c7, 0 @ flush TLB (v4)
#endif
ret lr
SYM_FUNC_END(cpu_arm720_switch_mm)
/*
* Function : arm720_set_pte_ext ( pte_t * ptep , pte_t pte , unsigned int ext )
* Params : r0 = Address to set
* : r1 = value to set
* Purpose : Set a PTE and flush it out of any WB cache
*/
.align 5
SYM_TYPED_FUNC_START(cpu_arm720_set_pte_ext)
#ifdef CONFIG_MMU
armv3_set_pte_ext wc_disable=0
#endif
ret lr
SYM_FUNC_END(cpu_arm720_set_pte_ext)
/*
* Function : arm720_reset
* Params : r0 = address to jump to
* Notes : This sets up everything for a reset
*/
.pushsection .idmap.text, "ax"
SYM_TYPED_FUNC_START(cpu_arm720_reset)
mov ip, #0
mcr p15, 0 , ip, c7, c7, 0 @ invalidate cache
#ifdef CONFIG_MMU
mcr p15, 0 , ip, c8, c7, 0 @ flush TLB (v4)
#endif
mrc p15, 0 , ip, c1, c0, 0 @ get ctrl register
bic ip, ip, #0 x000f @ ............wcam
bic ip, ip, #0 x2100 @ ..v....s........
mcr p15, 0 , ip, c1, c0, 0 @ ctrl register
ret r0
SYM_FUNC_END(cpu_arm720_reset)
.popsection
.type __arm710_setup, #function
__arm710_setup:
mov r0, #0
mcr p15, 0 , r0, c7, c7, 0 @ invalidate caches
#ifdef CONFIG_MMU
mcr p15, 0 , r0, c8, c7, 0 @ flush TLB (v4)
#endif
mrc p15, 0 , r0, c1, c0 @ get control register
ldr r5, arm710_cr1_clear
bic r0, r0, r5
ldr r5, arm710_cr1_set
orr r0, r0, r5
ret lr @ __ret (head.S)
.size __arm710_setup, . - __arm710_setup
/*
* R
* . RVI ZFRS BLDP WCAM
* . . . . 0001 . . 11 1101
*
*/
.type arm710_cr1_clear, #object
.type arm710_cr1_set, #object
arm710_cr1_clear:
.word 0 x0f3f
arm710_cr1_set:
.word 0 x013d
.type __arm720_setup, #function
__arm720_setup:
mov r0, #0
mcr p15, 0 , r0, c7, c7, 0 @ invalidate caches
#ifdef CONFIG_MMU
mcr p15, 0 , r0, c8, c7, 0 @ flush TLB (v4)
#endif
adr r5, arm720_crval
ldmia r5, {r5, r6}
mrc p15, 0 , r0, c1, c0 @ get control register
bic r0, r0, r5
orr r0, r0, r6
ret lr @ __ret (head.S)
.size __arm720_setup, . - __arm720_setup
/*
* R
* . RVI ZFRS BLDP WCAM
* . . 1 . 1001 . . 11 1101
*
*/
.type arm720_crval, #object
arm720_crval:
crval clear=0 x00002f3f, mmuset=0 x0000213d, ucset=0 x00000130
__INITDATA
@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
define_processor_functions arm720, dabort=v4t_late_abort, pabort=legacy_pabort
.section ".rodata"
string cpu_arch_name, "armv4t"
string cpu_elf_name, "v4"
string cpu_arm710_name, "ARM710T"
string cpu_arm720_name, "ARM720T"
.align
/*
* See < asm / procinfo . h > for a definition of this structure .
*/
.section ".proc.info.init" , "a"
.macro arm720_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req, cpu_flush:req
.type __\name\()_proc_info,#object
__\name\()_proc_info:
.long \cpu_val
.long \cpu_mask
.long PMD_TYPE_SECT | \
PMD_SECT_BUFFERABLE | \
PMD_SECT_CACHEABLE | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
initfn \cpu_flush, __\name\()_proc_info @ cpu_flush
.long cpu_arch_name @ arch_name
.long cpu_elf_name @ elf_name
.long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB @ elf_hwcap
.long \cpu_name
.long arm720_processor_functions
.long v4_tlb_fns
.long v4wt_user_fns
.long v4_cache_fns
.size __\name\()_proc_info, . - __\name\()_proc_info
.endm
arm720_proc_info arm710, 0 x41807100, 0 xffffff00, cpu_arm710_name, __arm710_setup
arm720_proc_info arm720, 0 x41807200, 0 xffffff00, cpu_arm720_name, __arm720_setup
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