214 lines
4.9 KiB
ArmAsm
214 lines
4.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* linux/arch/arm/mm/proc-fa526.S: MMU functions for FA526
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*
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* Written by : Luke Lee
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* Copyright (C) 2005 Faraday Corp.
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* Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
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*
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* These are the low level assembler for performing cache and TLB
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* functions on the fa526.
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <linux/pgtable.h>
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#include <asm/assembler.h>
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#include <asm/hwcap.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include "proc-macros.S"
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#define CACHE_DLINESIZE 16
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.text
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/*
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* cpu_fa526_proc_init()
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*/
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ENTRY(cpu_fa526_proc_init)
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ret lr
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/*
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* cpu_fa526_proc_fin()
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*/
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ENTRY(cpu_fa526_proc_fin)
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mrc p15, 0, r0, c1, c0, 0 @ ctrl register
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bic r0, r0, #0x1000 @ ...i............
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bic r0, r0, #0x000e @ ............wca.
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mcr p15, 0, r0, c1, c0, 0 @ disable caches
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nop
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nop
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ret lr
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/*
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* cpu_fa526_reset(loc)
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*
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* Perform a soft reset of the system. Put the CPU into the
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* same state as it would be if it had been reset, and branch
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* to what would be the reset vector.
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*
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* loc: location to jump to for soft reset
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*/
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.align 4
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.pushsection .idmap.text, "ax"
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ENTRY(cpu_fa526_reset)
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/* TODO: Use CP8 if possible... */
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mov ip, #0
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mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
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mcr p15, 0, ip, c7, c10, 4 @ drain WB
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#ifdef CONFIG_MMU
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mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
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#endif
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mrc p15, 0, ip, c1, c0, 0 @ ctrl register
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bic ip, ip, #0x000f @ ............wcam
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bic ip, ip, #0x1100 @ ...i...s........
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bic ip, ip, #0x0800 @ BTB off
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mcr p15, 0, ip, c1, c0, 0 @ ctrl register
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nop
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nop
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ret r0
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ENDPROC(cpu_fa526_reset)
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.popsection
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/*
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* cpu_fa526_do_idle()
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*/
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.align 4
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ENTRY(cpu_fa526_do_idle)
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ret lr
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ENTRY(cpu_fa526_dcache_clean_area)
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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add r0, r0, #CACHE_DLINESIZE
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subs r1, r1, #CACHE_DLINESIZE
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bhi 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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ret lr
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/* =============================== PageTable ============================== */
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/*
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* cpu_fa526_switch_mm(pgd)
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*
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* Set the translation base pointer to be as described by pgd.
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*
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* pgd: new page tables
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*/
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.align 4
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ENTRY(cpu_fa526_switch_mm)
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#ifdef CONFIG_MMU
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mov ip, #0
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#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
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mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
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#else
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mcr p15, 0, ip, c7, c14, 0 @ clean and invalidate whole D cache
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#endif
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mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
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mcr p15, 0, ip, c7, c5, 6 @ invalidate BTB since mm changed
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mcr p15, 0, ip, c7, c10, 4 @ data write barrier
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mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
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mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
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mcr p15, 0, ip, c8, c7, 0 @ invalidate UTLB
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#endif
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ret lr
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/*
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* cpu_fa526_set_pte_ext(ptep, pte, ext)
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*
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* Set a PTE and flush it out
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*/
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.align 4
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ENTRY(cpu_fa526_set_pte_ext)
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#ifdef CONFIG_MMU
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armv3_set_pte_ext
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mov r0, r0
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mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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mov r0, #0
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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#endif
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ret lr
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.type __fa526_setup, #function
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__fa526_setup:
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/* On return of this routine, r0 must carry correct flags for CFG register */
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mov r0, #0
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mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
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#ifdef CONFIG_MMU
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mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
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#endif
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mcr p15, 0, r0, c7, c5, 5 @ invalidate IScratchpad RAM
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mov r0, #1
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mcr p15, 0, r0, c1, c1, 0 @ turn-on ECR
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mov r0, #0
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mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB All
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mcr p15, 0, r0, c7, c10, 4 @ data write barrier
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mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
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mov r0, #0x1f @ Domains 0, 1 = manager, 2 = client
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mcr p15, 0, r0, c3, c0 @ load domain access register
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mrc p15, 0, r0, c1, c0 @ get control register v4
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ldr r5, fa526_cr1_clear
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bic r0, r0, r5
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ldr r5, fa526_cr1_set
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orr r0, r0, r5
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ret lr
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.size __fa526_setup, . - __fa526_setup
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/*
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* .RVI ZFRS BLDP WCAM
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* ..11 1001 .111 1101
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*
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*/
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.type fa526_cr1_clear, #object
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.type fa526_cr1_set, #object
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fa526_cr1_clear:
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.word 0x3f3f
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fa526_cr1_set:
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.word 0x397D
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__INITDATA
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@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
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define_processor_functions fa526, dabort=v4_early_abort, pabort=legacy_pabort
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.section ".rodata"
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string cpu_arch_name, "armv4"
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string cpu_elf_name, "v4"
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string cpu_fa526_name, "FA526"
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.align
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.section ".proc.info.init", "a"
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.type __fa526_proc_info,#object
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__fa526_proc_info:
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.long 0x66015261
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.long 0xff01fff1
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.long PMD_TYPE_SECT | \
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PMD_SECT_BUFFERABLE | \
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PMD_SECT_CACHEABLE | \
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PMD_BIT4 | \
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PMD_SECT_AP_WRITE | \
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PMD_SECT_AP_READ
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.long PMD_TYPE_SECT | \
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PMD_BIT4 | \
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PMD_SECT_AP_WRITE | \
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PMD_SECT_AP_READ
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initfn __fa526_setup, __fa526_proc_info
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.long cpu_arch_name
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.long cpu_elf_name
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.long HWCAP_SWP | HWCAP_HALF
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.long cpu_fa526_name
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.long fa526_processor_functions
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.long fa_tlb_fns
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.long fa_user_fns
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.long fa_cache_fns
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.size __fa526_proc_info, . - __fa526_proc_info
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