/*
* linux/arch/arm/mm/proc-feroceon.S: MMU functions for Feroceon
*
* Heavily based on proc-arm926.S
* Maintainer: Assaf Hoffman <hoffman@marvell.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
#include <asm/elf.h>
#include <asm/pgtable-hwdef.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include "proc-macros.S"
/*
* This is the maximum size of an area which will be invalidated
* using the single invalidate entry instructions. Anything larger
* than this, and we go for the whole cache.
*
* This value should be chosen such that we choose the cheapest
* alternative.
*/
#define CACHE_DLIMIT 16384
/*
* the cache line size of the I and D cache
*/
#define CACHE_DLINESIZE 32
.bss
.align 3
__cache_params_loc:
.space 8
.text
__cache_params:
.word __cache_params_loc
/*
* cpu_feroceon_proc_init()
*/
ENTRY(cpu_feroceon_proc_init)
mrc p15, 0, r0, c0, c0, 1 @ read cache type register
ldr r1, __cache_params
mov r2, #(16 << 5)
tst r0, #(1 << 16) @ get way
mov r0, r0, lsr #18 @ get cache size order
movne r3, #((4 - 1) << 30) @ 4-way
and r0, r0, #0xf
moveq r3, #0 @ 1-way
mov r2, r2, lsl r0 @ actual cache size
movne r2, r2, lsr #2 @ turned into # of sets
sub r2, r2, #(1 << 5)
stmia r1, {r2, r3}
mov pc, lr
/*
* cpu_feroceon_proc_fin()
*/
ENTRY(cpu_feroceon_proc_fin)
stmfd sp!, {lr}
mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
msr cpsr_c, ip
bl feroceon_flush_kern_cache_all
mrc p15, 0, r0, c1, c0, 0 @ ctrl register
bic r0, r0, #0x1000 @ ...i............
bic r0, r0, #0x000e @ ............wca.
mcr p15, 0, r0, c1, c0, 0 @ disable caches
ldmfd sp!, {pc}
/*
* cpu_feroceon_reset(loc)
*
* Perform a soft reset of the system. Put the CPU into the
* same state as it would be if it had been reset, and branch
* to what would be the reset vector.
*
* loc: location to jump to for soft reset
*/
.align 5
ENTRY(cpu_feroceon_reset)
mov ip, #0
mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
mcr p15, 0, ip, c7, c10, 4 @ drain WB
#ifdef CONFIG_MMU
mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
#endif
mrc p15, 0, ip, c1, c0, 0 @ ctrl register
bic ip, ip, #0x000f @ ............wcam
bic ip, ip, #0x1100 @ ...i...s........
mcr p15, 0, ip, c1, c0, 0 @ ctrl register
mov pc, r0
/*
* cpu_feroceon_do_idle()
*
* Called with IRQs disabled
*/
.align 5
ENTRY(cpu_feroceon_do_idle)
mov r0, #0
mcr p15, 0, r0, c7, c10, 4 @ Drain write buffer
mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
mov pc, lr
/*
* flush_user_cache_all()
*
* Clean and invalidate all cache entries in a particular
* address space.
*/
.align 5
ENTRY(feroceon_flush_user_cache_all)
/* FALLTHROUGH */
/*
* flush_kern_cache_all()
*
* Clean and invalidate the entire cache.
*/
ENTRY(feroceon_flush_kern_cache_all)
mov r2, #VM_EXEC
__flush_whole_cache:
ldr r1, __cache_params
ldmia r1, {r1, r3}
1: orr ip, r1, r3
2: mcr p15, 0, ip, c7, c14, 2 @ clean + invalidate D set/way
subs ip, ip, #(1 << 30) @ next way
bcs 2b
subs r1, r1, #(1 << 5) @ next set
bcs 1b
tst r2, #VM_EXEC
mov ip, #0
mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
mcrne p15, 0, ip, c7, c10, 4 @ drain WB
mov pc, lr
/*
* flush_user_cache_range(start, end, flags)
*
* Clean and invalidate a range of cache entries in the
* specified address range.
*
* - start - start address (inclusive)
* - end - end address (exclusive)
* - flags - vm_flags describing address space
*/
.align 5
ENTRY(feroceon_flush_user_cache_range)
sub r3, r1, r0 @ calculate total size
cmp r3, #CACHE_DLIMIT
bgt __flush_whole_cache
1: tst r2, #VM_EXEC
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
add r0, r0, #CACHE_DLINESIZE
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
add r0, r0, #CACHE_DLINESIZE
cmp r0, r1
blo 1b
tst r2, #VM_EXEC
mov ip, #0
mcrne p15, 0, ip, c7, c10, 4 @ drain WB
mov pc, lr
/*
* coherent_kern_range(start, end)
*
* Ensure coherency between the Icache and the Dcache in the
* region described by start, end. If you have non-snooping
* Harvard caches, you need to implement this function.
*
* - start - virtual start address
* - end - virtual end address
*/
.align 5
ENTRY(feroceon_coherent_kern_range)
/* FALLTHROUGH */
/*
* coherent_user_range(start, end)
*
* Ensure coherency between the Icache and the Dcache in the
* region described by start, end. If you have non-snooping
* Harvard caches, you need to implement this function.
*
* - start - virtual start address
* - end - virtual end address
*/
ENTRY(feroceon_coherent_user_range)
bic r0, r0, #CACHE_DLINESIZE - 1
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
add r0, r0, #CACHE_DLINESIZE
cmp r0, r1
blo 1b
mcr p15, 0, r0, c7, c10, 4 @ drain WB
mov pc, lr
/*
* flush_kern_dcache_page(void *page)
*
* Ensure no D cache aliasing occurs, either with itself or
* the I cache
*
* - addr - page aligned address
*/
.align 5
ENTRY(feroceon_flush_kern_dcache_page)
add r1, r0, #PAGE_SZ
1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
add r0, r0, #CACHE_DLINESIZE
cmp r0, r1
blo 1b
mov r0, #0
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
mcr p15, 0, r0, c7, c10, 4 @ drain WB
mov pc, lr
/*
* dma_inv_range(start, end)
*
* Invalidate (discard) the specified virtual address range.
* May not write back any entries. If 'start' or 'end'
* are not cache line aligned, those lines must be written
* back.
*
* - start - virtual start address
* - end - virtual end address
*
* (same as v4wb)
*/
.align 5
ENTRY(feroceon_dma_inv_range)
tst r0, #CACHE_DLINESIZE - 1
mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
tst r1, #CACHE_DLINESIZE - 1
mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
bic r0, r0, #CACHE_DLINESIZE - 1
1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
add r0, r0, #CACHE_DLINESIZE
cmp r0, r1
blo 1b
mcr p15, 0, r0, c7, c10, 4 @ drain WB
mov pc, lr
/*
* dma_clean_range(start, end)
*
* Clean the specified virtual address range.
*
* - start - virtual start address
* - end - virtual end address
*
* (same as v4wb)
*/
.align 5
ENTRY(feroceon_dma_clean_range)
bic r0, r0, #CACHE_DLINESIZE - 1
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
add r0, r0, #CACHE_DLINESIZE
cmp r0, r1
blo 1b
mcr p15, 0, r0, c7, c10, 4 @ drain WB
mov pc, lr
/*
* dma_flush_range(start, end)
*
* Clean and invalidate the specified virtual address range.
*
* - start - virtual start address
* - end - virtual end address
*/
.align 5
ENTRY(feroceon_dma_flush_range)
bic r0, r0, #CACHE_DLINESIZE - 1
1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
add r0, r0, #CACHE_DLINESIZE
cmp r0, r1
blo 1b
mcr p15, 0, r0, c7, c10, 4 @ drain WB
mov pc, lr
ENTRY(feroceon_cache_fns)
.long feroceon_flush_kern_cache_all
.long feroceon_flush_user_cache_all
.long feroceon_flush_user_cache_range
.long feroceon_coherent_kern_range
.long feroceon_coherent_user_range
.long feroceon_flush_kern_dcache_page
.long feroceon_dma_inv_range
.long feroceon_dma_clean_range
.long feroceon_dma_flush_range
.align 5
ENTRY(cpu_feroceon_dcache_clean_area)
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
add r0, r0, #CACHE_DLINESIZE
subs r1, r1, #CACHE_DLINESIZE
bhi 1b
mcr p15, 0, r0, c7, c10, 4 @ drain WB
mov pc, lr
/* =============================== PageTable ============================== */
/*
* cpu_feroceon_switch_mm(pgd)
*
* Set the translation base pointer to be as described by pgd.
*
* pgd: new page tables
*/
.align 5
ENTRY(cpu_feroceon_switch_mm)
#ifdef CONFIG_MMU
/*
* Note: we wish to call __flush_whole_cache but we need to preserve
* lr to do so. The only way without touching main memory is to
* use r2 which is normally used to test the VM_EXEC flag, and
* compensate locally for the skipped ops if it is not set.
*/
mov r2, lr @ abuse r2 to preserve lr
bl __flush_whole_cache
@ if r2 contains the VM_EXEC bit then the next 2 ops are done already
tst r2, #VM_EXEC
mcreq p15, 0, ip, c7, c5, 0 @ invalidate I cache
mcreq 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
mov pc, r2
#else
mov pc, lr
#endif
/*
* cpu_feroceon_set_pte_ext(ptep, pte, ext)
*
* Set a PTE and flush it out
*/
.align 5
ENTRY(cpu_feroceon_set_pte_ext)
#ifdef CONFIG_MMU
str r1, [r0], #-2048 @ linux version
eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
bic r2, r1, #PTE_SMALL_AP_MASK
bic r2, r2, #PTE_TYPE_MASK
orr r2, r2, #PTE_TYPE_SMALL
tst r1, #L_PTE_USER @ User?
orrne r2, r2, #PTE_SMALL_AP_URO_SRW
tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
movne r2, #0
str r2, [r0] @ hardware version
mov r0, r0
mcr p15, 0, r0, c7, c10, 1 @ clean D entry
mcr p15, 0, r0, c7, c10, 4 @ drain WB
#endif
mov pc, lr
__INIT
.type __feroceon_setup, #function
__feroceon_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
#ifdef CONFIG_MMU
mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
#endif
adr r5, feroceon_crval
ldmia r5, {r5, r6}
mrc p15, 0, r0, c1, c0 @ get control register v4
bic r0, r0, r5
orr r0, r0, r6
mov pc, lr
.size __feroceon_setup, . - __feroceon_setup
/*
* R
* .RVI ZFRS BLDP WCAM
* .011 0001 ..11 0101
*
*/
.type feroceon_crval, #object
feroceon_crval:
crval clear=0x00007f3f, mmuset=0x00003135, ucset=0x00001134
__INITDATA
/*
* Purpose : Function pointers used to access above functions - all calls
* come through these
*/
.type feroceon_processor_functions, #object
feroceon_processor_functions:
.word v5t_early_abort
.word pabort_noifar
.word cpu_feroceon_proc_init
.word cpu_feroceon_proc_fin
.word cpu_feroceon_reset
.word cpu_feroceon_do_idle
.word cpu_feroceon_dcache_clean_area
.word cpu_feroceon_switch_mm
.word cpu_feroceon_set_pte_ext
.size feroceon_processor_functions, . - feroceon_processor_functions
.section ".rodata"
.type cpu_arch_name, #object
cpu_arch_name:
.asciz "armv5te"
.size cpu_arch_name, . - cpu_arch_name
.type cpu_elf_name, #object
cpu_elf_name:
.asciz "v5"
.size cpu_elf_name, . - cpu_elf_name
.type cpu_feroceon_name, #object
cpu_feroceon_name:
.asciz "Feroceon"
.size cpu_feroceon_name, . - cpu_feroceon_name
.type cpu_88fr531_name, #object
cpu_88fr531_name:
.asciz "Feroceon 88FR531-vd"
.size cpu_88fr531_name, . - cpu_88fr531_name
.align
.section ".proc.info.init", #alloc, #execinstr
#ifdef CONFIG_CPU_FEROCEON_OLD_ID
.type __feroceon_old_id_proc_info,#object
__feroceon_old_id_proc_info:
.long 0x41009260
.long 0xff00fff0
.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
b __feroceon_setup
.long cpu_arch_name
.long cpu_elf_name
.long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
.long cpu_feroceon_name
.long feroceon_processor_functions
.long v4wbi_tlb_fns
.long feroceon_user_fns
.long feroceon_cache_fns
.size __feroceon_old_id_proc_info, . - __feroceon_old_id_proc_info
#endif
.type __88fr531_proc_info,#object
__88fr531_proc_info:
.long 0x56055310
.long 0xfffffff0
.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
b __feroceon_setup
.long cpu_arch_name
.long cpu_elf_name
.long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
.long cpu_88fr531_name
.long feroceon_processor_functions
.long v4wbi_tlb_fns
.long feroceon_user_fns
.long feroceon_cache_fns
.size __88fr531_proc_info, . - __88fr531_proc_info
