2005-04-16 16:20:36 -06:00
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/*
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* linux/arch/arm/mm/proc-arm920.S: MMU functions for ARM920
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*
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* Copyright (C) 1999,2000 ARM Limited
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* Copyright (C) 2000 Deep Blue Solutions Ltd.
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2006-06-28 07:10:01 -06:00
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* hacked for non-paged-MM by Hyok S. Choi, 2003.
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2005-04-16 16:20:36 -06:00
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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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 arm920.
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*
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* CONFIG_CPU_ARM920_CPU_IDLE -> nohlt
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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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2008-09-07 12:15:31 -06:00
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#include <asm/hwcap.h>
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2006-03-16 07:44:36 -07:00
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#include <asm/pgtable-hwdef.h>
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2005-04-16 16:20:36 -06:00
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#include <asm/pgtable.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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/*
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* The size of one data cache line.
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*/
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#define CACHE_DLINESIZE 32
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/*
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* The number of data cache segments.
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*/
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#define CACHE_DSEGMENTS 8
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/*
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* The number of lines in a cache segment.
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*/
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#define CACHE_DENTRIES 64
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/*
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* This is the size at which it becomes more efficient to
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* clean the whole cache, rather than using the individual
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2011-03-30 19:57:33 -06:00
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* cache line maintenance instructions.
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2005-04-16 16:20:36 -06:00
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*/
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#define CACHE_DLIMIT 65536
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.text
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/*
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* cpu_arm920_proc_init()
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*/
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ENTRY(cpu_arm920_proc_init)
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mov pc, lr
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/*
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* cpu_arm920_proc_fin()
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*/
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ENTRY(cpu_arm920_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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2010-07-26 05:22:12 -06:00
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mov pc, lr
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2005-04-16 16:20:36 -06:00
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/*
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* cpu_arm920_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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ENTRY(cpu_arm920_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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2006-06-28 07:10:01 -06:00
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#ifdef CONFIG_MMU
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2005-04-16 16:20:36 -06:00
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mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
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2006-06-28 07:10:01 -06:00
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#endif
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2005-04-16 16:20:36 -06:00
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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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mov pc, r0
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/*
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* cpu_arm920_do_idle()
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*/
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.align 5
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ENTRY(cpu_arm920_do_idle)
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mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
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mov pc, lr
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#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
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2010-10-28 04:27:40 -06:00
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/*
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* flush_icache_all()
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*
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* Unconditionally clean and invalidate the entire icache.
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*/
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ENTRY(arm920_flush_icache_all)
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mov r0, #0
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mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
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mov pc, lr
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ENDPROC(arm920_flush_icache_all)
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2005-04-16 16:20:36 -06:00
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/*
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* flush_user_cache_all()
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*
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* Invalidate all cache entries in a particular address
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* space.
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*/
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ENTRY(arm920_flush_user_cache_all)
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/* FALLTHROUGH */
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/*
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* flush_kern_cache_all()
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*
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* Clean and invalidate the entire cache.
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*/
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ENTRY(arm920_flush_kern_cache_all)
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mov r2, #VM_EXEC
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mov ip, #0
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__flush_whole_cache:
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mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
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1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
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2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
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subs r3, r3, #1 << 26
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bcs 2b @ entries 63 to 0
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subs r1, r1, #1 << 5
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bcs 1b @ segments 7 to 0
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tst r2, #VM_EXEC
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mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
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mcrne p15, 0, ip, c7, c10, 4 @ drain WB
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mov pc, lr
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/*
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* flush_user_cache_range(start, end, flags)
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*
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* Invalidate a range of cache entries in the specified
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* address space.
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*
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* - start - start address (inclusive)
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* - end - end address (exclusive)
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* - flags - vm_flags for address space
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*/
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ENTRY(arm920_flush_user_cache_range)
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mov ip, #0
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sub r3, r1, r0 @ calculate total size
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cmp r3, #CACHE_DLIMIT
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bhs __flush_whole_cache
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1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
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tst r2, #VM_EXEC
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mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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tst r2, #VM_EXEC
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mcrne p15, 0, ip, c7, c10, 4 @ drain WB
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mov pc, lr
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/*
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* coherent_kern_range(start, end)
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*
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* Ensure coherency between the Icache and the Dcache in the
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* region described by start, end. If you have non-snooping
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* Harvard caches, you need to implement this function.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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ENTRY(arm920_coherent_kern_range)
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/* FALLTHROUGH */
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/*
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* coherent_user_range(start, end)
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*
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* Ensure coherency between the Icache and the Dcache in the
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* region described by start, end. If you have non-snooping
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* Harvard caches, you need to implement this function.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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ENTRY(arm920_coherent_user_range)
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bic r0, r0, #CACHE_DLINESIZE - 1
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
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/*
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2009-11-26 05:56:21 -07:00
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* flush_kern_dcache_area(void *addr, size_t size)
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2005-04-16 16:20:36 -06:00
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*
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* Ensure no D cache aliasing occurs, either with itself or
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* the I cache
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*
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2009-11-26 05:56:21 -07:00
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* - addr - kernel address
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* - size - region size
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2005-04-16 16:20:36 -06:00
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*/
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2009-11-26 05:56:21 -07:00
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ENTRY(arm920_flush_kern_dcache_area)
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add r1, r0, r1
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2005-04-16 16:20:36 -06:00
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1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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mov r0, #0
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mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
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/*
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* dma_inv_range(start, end)
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*
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* Invalidate (discard) the specified virtual address range.
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* May not write back any entries. If 'start' or 'end'
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* are not cache line aligned, those lines must be written
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* back.
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*
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* - start - virtual start address
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* - end - virtual end address
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*
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* (same as v4wb)
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*/
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2009-11-26 09:24:19 -07:00
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arm920_dma_inv_range:
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2005-04-16 16:20:36 -06:00
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tst r0, #CACHE_DLINESIZE - 1
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bic r0, r0, #CACHE_DLINESIZE - 1
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mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
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tst r1, #CACHE_DLINESIZE - 1
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mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
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1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
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/*
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* dma_clean_range(start, end)
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*
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* Clean the specified virtual address range.
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*
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* - start - virtual start address
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* - end - virtual end address
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*
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* (same as v4wb)
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*/
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2009-11-26 09:24:19 -07:00
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arm920_dma_clean_range:
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2005-04-16 16:20:36 -06:00
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bic r0, r0, #CACHE_DLINESIZE - 1
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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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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
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/*
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* dma_flush_range(start, end)
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*
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* Clean and invalidate the specified virtual address range.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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ENTRY(arm920_dma_flush_range)
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bic r0, r0, #CACHE_DLINESIZE - 1
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1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
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2009-11-26 09:19:58 -07:00
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/*
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* dma_map_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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ENTRY(arm920_dma_map_area)
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add r1, r1, r0
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cmp r2, #DMA_TO_DEVICE
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beq arm920_dma_clean_range
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bcs arm920_dma_inv_range
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b arm920_dma_flush_range
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ENDPROC(arm920_dma_map_area)
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/*
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* dma_unmap_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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ENTRY(arm920_dma_unmap_area)
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mov pc, lr
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ENDPROC(arm920_dma_unmap_area)
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2011-06-23 10:19:48 -06:00
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@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
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define_cache_functions arm920
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2005-04-16 16:20:36 -06:00
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#endif
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ENTRY(cpu_arm920_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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mov pc, lr
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/* =============================== PageTable ============================== */
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/*
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* cpu_arm920_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_arm920_switch_mm)
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2006-06-28 07:10:01 -06:00
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#ifdef CONFIG_MMU
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2005-04-16 16:20:36 -06:00
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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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@ && 'Clean & Invalidate whole DCache'
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@ && Re-written to use Index Ops.
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@ && Uses registers r1, r3 and ip
|
|
|
|
|
|
|
|
mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
|
|
|
|
1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
|
|
|
|
2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
|
|
|
|
subs r3, r3, #1 << 26
|
|
|
|
bcs 2b @ entries 63 to 0
|
|
|
|
subs r1, r1, #1 << 5
|
|
|
|
bcs 1b @ segments 7 to 0
|
|
|
|
#endif
|
|
|
|
mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
|
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain WB
|
|
|
|
mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
|
|
|
|
mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
|
2006-06-28 07:10:01 -06:00
|
|
|
#endif
|
2005-04-16 16:20:36 -06:00
|
|
|
mov pc, lr
|
|
|
|
|
|
|
|
/*
|
2006-12-13 07:34:43 -07:00
|
|
|
* cpu_arm920_set_pte(ptep, pte, ext)
|
2005-04-16 16:20:36 -06:00
|
|
|
*
|
|
|
|
* Set a PTE and flush it out
|
|
|
|
*/
|
|
|
|
.align 5
|
2006-12-13 07:34:43 -07:00
|
|
|
ENTRY(cpu_arm920_set_pte_ext)
|
2006-06-28 07:10:01 -06:00
|
|
|
#ifdef CONFIG_MMU
|
2008-09-06 10:19:08 -06:00
|
|
|
armv3_set_pte_ext
|
2005-04-16 16:20:36 -06:00
|
|
|
mov r0, r0
|
|
|
|
mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
2008-09-06 10:19:08 -06:00
|
|
|
#endif
|
2005-04-16 16:20:36 -06:00
|
|
|
mov pc, lr
|
|
|
|
|
2011-02-06 08:48:39 -07:00
|
|
|
/* Suspend/resume support: taken from arch/arm/plat-s3c24xx/sleep.S */
|
|
|
|
.globl cpu_arm920_suspend_size
|
2011-08-27 04:43:14 -06:00
|
|
|
.equ cpu_arm920_suspend_size, 4 * 4
|
2011-04-02 03:08:55 -06:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
2011-02-06 08:48:39 -07:00
|
|
|
ENTRY(cpu_arm920_do_suspend)
|
|
|
|
stmfd sp!, {r4 - r7, lr}
|
|
|
|
mrc p15, 0, r4, c13, c0, 0 @ PID
|
|
|
|
mrc p15, 0, r5, c3, c0, 0 @ Domain ID
|
|
|
|
mrc p15, 0, r6, c2, c0, 0 @ TTB address
|
|
|
|
mrc p15, 0, r7, c1, c0, 0 @ Control register
|
|
|
|
stmia r0, {r4 - r7}
|
|
|
|
ldmfd sp!, {r4 - r7, pc}
|
|
|
|
ENDPROC(cpu_arm920_do_suspend)
|
|
|
|
|
|
|
|
ENTRY(cpu_arm920_do_resume)
|
|
|
|
mov ip, #0
|
|
|
|
mcr p15, 0, ip, c8, c7, 0 @ invalidate I+D TLBs
|
|
|
|
mcr p15, 0, ip, c7, c7, 0 @ invalidate I+D caches
|
|
|
|
ldmia r0, {r4 - r7}
|
|
|
|
mcr p15, 0, r4, c13, c0, 0 @ PID
|
|
|
|
mcr p15, 0, r5, c3, c0, 0 @ Domain ID
|
|
|
|
mcr p15, 0, r6, c2, c0, 0 @ TTB address
|
|
|
|
mov r0, r7 @ control register
|
|
|
|
mov r2, r6, lsr #14 @ get TTB0 base
|
|
|
|
mov r2, r2, lsl #14
|
|
|
|
ldr r3, =PMD_TYPE_SECT | PMD_SECT_BUFFERABLE | \
|
|
|
|
PMD_SECT_CACHEABLE | PMD_BIT4 | PMD_SECT_AP_WRITE
|
|
|
|
b cpu_resume_mmu
|
|
|
|
ENDPROC(cpu_arm920_do_resume)
|
|
|
|
#endif
|
|
|
|
|
2010-10-01 08:37:05 -06:00
|
|
|
__CPUINIT
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
.type __arm920_setup, #function
|
|
|
|
__arm920_setup:
|
|
|
|
mov r0, #0
|
|
|
|
mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
|
|
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
|
2006-06-28 07:10:01 -06:00
|
|
|
#ifdef CONFIG_MMU
|
2005-04-16 16:20:36 -06:00
|
|
|
mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
|
2006-06-28 07:10:01 -06:00
|
|
|
#endif
|
2006-06-29 08:09:57 -06:00
|
|
|
adr r5, arm920_crval
|
|
|
|
ldmia r5, {r5, r6}
|
2005-04-16 16:20:36 -06:00
|
|
|
mrc p15, 0, r0, c1, c0 @ get control register v4
|
|
|
|
bic r0, r0, r5
|
2006-06-29 08:09:57 -06:00
|
|
|
orr r0, r0, r6
|
2005-04-16 16:20:36 -06:00
|
|
|
mov pc, lr
|
|
|
|
.size __arm920_setup, . - __arm920_setup
|
|
|
|
|
|
|
|
/*
|
|
|
|
* R
|
|
|
|
* .RVI ZFRS BLDP WCAM
|
|
|
|
* ..11 0001 ..11 0101
|
|
|
|
*
|
|
|
|
*/
|
2006-06-29 08:09:57 -06:00
|
|
|
.type arm920_crval, #object
|
|
|
|
arm920_crval:
|
|
|
|
crval clear=0x00003f3f, mmuset=0x00003135, ucset=0x00001130
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
__INITDATA
|
2011-06-23 10:19:48 -06:00
|
|
|
@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
|
|
|
|
define_processor_functions arm920, dabort=v4t_early_abort, pabort=legacy_pabort, suspend=1
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
.section ".rodata"
|
|
|
|
|
2011-06-23 10:19:48 -06:00
|
|
|
string cpu_arch_name, "armv4t"
|
|
|
|
string cpu_elf_name, "v4"
|
|
|
|
string cpu_arm920_name, "ARM920T"
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
.align
|
|
|
|
|
2005-09-20 09:35:03 -06:00
|
|
|
.section ".proc.info.init", #alloc, #execinstr
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
.type __arm920_proc_info,#object
|
|
|
|
__arm920_proc_info:
|
|
|
|
.long 0x41009200
|
|
|
|
.long 0xff00fff0
|
|
|
|
.long PMD_TYPE_SECT | \
|
|
|
|
PMD_SECT_BUFFERABLE | \
|
|
|
|
PMD_SECT_CACHEABLE | \
|
|
|
|
PMD_BIT4 | \
|
|
|
|
PMD_SECT_AP_WRITE | \
|
|
|
|
PMD_SECT_AP_READ
|
2006-06-29 11:24:21 -06:00
|
|
|
.long PMD_TYPE_SECT | \
|
|
|
|
PMD_BIT4 | \
|
|
|
|
PMD_SECT_AP_WRITE | \
|
|
|
|
PMD_SECT_AP_READ
|
2005-04-16 16:20:36 -06:00
|
|
|
b __arm920_setup
|
|
|
|
.long cpu_arch_name
|
|
|
|
.long cpu_elf_name
|
|
|
|
.long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
|
|
|
|
.long cpu_arm920_name
|
|
|
|
.long arm920_processor_functions
|
|
|
|
.long v4wbi_tlb_fns
|
|
|
|
.long v4wb_user_fns
|
|
|
|
#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
|
|
|
|
.long arm920_cache_fns
|
|
|
|
#else
|
|
|
|
.long v4wt_cache_fns
|
|
|
|
#endif
|
|
|
|
.size __arm920_proc_info, . - __arm920_proc_info
|