223 lines
5.1 KiB
ArmAsm
223 lines
5.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/arch/arm/mm/proc-sa110.S
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*
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* Copyright (C) 1997-2002 Russell King
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* hacked for non-paged-MM by Hyok S. Choi, 2003.
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*
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* MMU functions for SA110
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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 StrongARM-110.
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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 <asm/assembler.h>
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#include <asm/asm-offsets.h>
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#include <asm/hwcap.h>
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#include <mach/hardware.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/pgtable.h>
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#include <asm/ptrace.h>
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#include "proc-macros.S"
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/*
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* the cache line size of the I and D cache
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*/
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#define DCACHELINESIZE 32
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.text
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/*
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* cpu_sa110_proc_init()
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*/
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ENTRY(cpu_sa110_proc_init)
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mov r0, #0
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mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching
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ret lr
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/*
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* cpu_sa110_proc_fin()
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*/
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ENTRY(cpu_sa110_proc_fin)
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mov r0, #0
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mcr p15, 0, r0, c15, c2, 2 @ Disable clock switching
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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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ret lr
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/*
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* cpu_sa110_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 5
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.pushsection .idmap.text, "ax"
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ENTRY(cpu_sa110_reset)
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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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mcr p15, 0, ip, c1, c0, 0 @ ctrl register
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ret r0
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ENDPROC(cpu_sa110_reset)
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.popsection
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/*
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* cpu_sa110_do_idle(type)
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*
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* Cause the processor to idle
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*
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* type: call type:
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* 0 = slow idle
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* 1 = fast idle
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* 2 = switch to slow processor clock
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* 3 = switch to fast processor clock
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*/
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.align 5
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ENTRY(cpu_sa110_do_idle)
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mcr p15, 0, ip, c15, c2, 2 @ disable clock switching
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ldr r1, =UNCACHEABLE_ADDR @ load from uncacheable loc
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ldr r1, [r1, #0] @ force switch to MCLK
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mov r0, r0 @ safety
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mov r0, r0 @ safety
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mov r0, r0 @ safety
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mcr p15, 0, r0, c15, c8, 2 @ Wait for interrupt, cache aligned
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mov r0, r0 @ safety
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mov r0, r0 @ safety
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mov r0, r0 @ safety
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mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
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ret lr
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/* ================================= CACHE ================================ */
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/*
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* cpu_sa110_dcache_clean_area(addr,sz)
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*
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* Clean the specified entry of any caches such that the MMU
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* translation fetches will obtain correct data.
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*
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* addr: cache-unaligned virtual address
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*/
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.align 5
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ENTRY(cpu_sa110_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, #DCACHELINESIZE
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subs r1, r1, #DCACHELINESIZE
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bhi 1b
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ret lr
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/* =============================== PageTable ============================== */
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/*
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* cpu_sa110_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 5
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ENTRY(cpu_sa110_switch_mm)
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#ifdef CONFIG_MMU
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str lr, [sp, #-4]!
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bl v4wb_flush_kern_cache_all @ clears IP
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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 I & D TLBs
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ldr pc, [sp], #4
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#else
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ret lr
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#endif
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/*
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* cpu_sa110_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 5
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ENTRY(cpu_sa110_set_pte_ext)
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#ifdef CONFIG_MMU
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armv3_set_pte_ext wc_disable=0
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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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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 __sa110_setup, #function
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__sa110_setup:
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mov r10, #0
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mcr p15, 0, r10, c7, c7 @ invalidate I,D caches on v4
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mcr p15, 0, r10, c7, c10, 4 @ drain write buffer on v4
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#ifdef CONFIG_MMU
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mcr p15, 0, r10, c8, c7 @ invalidate I,D TLBs on v4
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#endif
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adr r5, sa110_crval
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ldmia r5, {r5, r6}
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mrc p15, 0, r0, c1, c0 @ get control register v4
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bic r0, r0, r5
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orr r0, r0, r6
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ret lr
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.size __sa110_setup, . - __sa110_setup
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/*
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* R
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* .RVI ZFRS BLDP WCAM
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* ..01 0001 ..11 1101
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*
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*/
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.type sa110_crval, #object
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sa110_crval:
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crval clear=0x00003f3f, mmuset=0x0000113d, ucset=0x00001130
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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 sa110, 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_sa110_name, "StrongARM-110"
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.align
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.section ".proc.info.init", #alloc
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.type __sa110_proc_info,#object
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__sa110_proc_info:
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.long 0x4401a100
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.long 0xfffffff0
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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_SECT_AP_WRITE | \
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PMD_SECT_AP_READ
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.long PMD_TYPE_SECT | \
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PMD_SECT_AP_WRITE | \
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PMD_SECT_AP_READ
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initfn __sa110_setup, __sa110_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 | HWCAP_26BIT | HWCAP_FAST_MULT
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.long cpu_sa110_name
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.long sa110_processor_functions
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.long v4wb_tlb_fns
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.long v4wb_user_fns
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.long v4wb_cache_fns
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.size __sa110_proc_info, . - __sa110_proc_info
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