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linux/arch/arm/mm/proc-xsc3.S
Eric Miao 905a09d57a [ARM] pxa: add support for L2 outer cache on XScale3 (attempt 2) 
(20072fd0c9 lost most of its changes
somehow, came from a mbox archive applied with git-am.  No idea
what happened.  This puts back the missing bits.  --rmk)

The initial patch from Lothar, and Lennert make it into a cleaner
one, modified and tested on PXA320 by Eric Miao.

This patch moves the L2 cache operations out of proc-xsc3.S into
dedicated outer cache support code.

CACHE_XSC3L2 can be deselected so no L2 cache specific code will be
linked in, and that L2 enable bit will not be set, this applies to
the following cases:

    a. _only_ PXA300/PXA310 support included and no L2 cache wanted
    b. PXA320 support included, but want L2 be disabled

So the enabling of L2 depends on two things:

    - CACHE_XSC3L2 is selected
    - and L2 cache is present

Where the latter is only a safeguard (previous testing shows it works
OK even when this bit is turned on).

IXP series of processors with XScale3 cannot disable L2 cache for the
moment since they depend on the L2 cache for its coherent memory, so
IXP may always select CACHE_XSC3L2.

Other L2 relevant bits are always turned on (i.e. the original code
enclosed by #if L2_CACHE_ENABLED .. #endif), as they showed no side
effects. Specifically, these bits are:

   - OC bits in TTBASE register (table walk outer cache attributes)
   - LLR Outer Cache Attributes (OC) in Auxiliary Control Register

Signed-off-by: Lothar WaÃ<9f>mann <LW@KARO-electronics.de>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-07-28 23:13:09 +01:00

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/*
* linux/arch/arm/mm/proc-xsc3.S
*
* Original Author: Matthew Gilbert
* Current Maintainer: Lennert Buytenhek <buytenh@wantstofly.org>
*
* Copyright 2004 (C) Intel Corp.
* Copyright 2005 (C) MontaVista Software, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* MMU functions for the Intel XScale3 Core (XSC3). The XSC3 core is
* an extension to Intel's original XScale core that adds the following
* features:
*
* - ARMv6 Supersections
* - Low Locality Reference pages (replaces mini-cache)
* - 36-bit addressing
* - L2 cache
* - Cache coherency if chipset supports it
*
* Based on original XScale code by Nicolas Pitre.
*/
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
#include <asm/elf.h>
#include <asm/hardware.h>
#include <asm/pgtable.h>
#include <asm/pgtable-hwdef.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include "proc-macros.S"
/*
* This is the maximum size of an area which will be flushed. If the
* area is larger than this, then we flush the whole cache.
*/
#define MAX_AREA_SIZE 32768
/*
* The cache line size of the L1 I, L1 D and unified L2 cache.
*/
#define CACHELINESIZE 32
/*
* The size of the L1 D cache.
*/
#define CACHESIZE 32768
/*
* This macro is used to wait for a CP15 write and is needed when we
* have to ensure that the last operation to the coprocessor was
* completed before continuing with operation.
*/
.macro cpwait_ret, lr, rd
mrc p15, 0, \rd, c2, c0, 0 @ arbitrary read of cp15
sub pc, \lr, \rd, LSR #32 @ wait for completion and
@ flush instruction pipeline
.endm
/*
* This macro cleans and invalidates the entire L1 D cache.
*/
.macro clean_d_cache rd, rs
mov \rd, #0x1f00
orr \rd, \rd, #0x00e0
1: mcr p15, 0, \rd, c7, c14, 2 @ clean/invalidate L1 D line
adds \rd, \rd, #0x40000000
bcc 1b
subs \rd, \rd, #0x20
bpl 1b
.endm
.text
/*
* cpu_xsc3_proc_init()
*
* Nothing too exciting at the moment
*/
ENTRY(cpu_xsc3_proc_init)
mov pc, lr
/*
* cpu_xsc3_proc_fin()
*/
ENTRY(cpu_xsc3_proc_fin)
str lr, [sp, #-4]!
mov r0, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
msr cpsr_c, r0
bl xsc3_flush_kern_cache_all @ clean caches
mrc p15, 0, r0, c1, c0, 0 @ ctrl register
bic r0, r0, #0x1800 @ ...IZ...........
bic r0, r0, #0x0006 @ .............CA.
mcr p15, 0, r0, c1, c0, 0 @ disable caches
ldr pc, [sp], #4
/*
* cpu_xsc3_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_xsc3_reset)
mov r1, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
msr cpsr_c, r1 @ reset CPSR
mrc p15, 0, r1, c1, c0, 0 @ ctrl register
bic r1, r1, #0x3900 @ ..VIZ..S........
bic r1, r1, #0x0086 @ ........B....CA.
mcr p15, 0, r1, c1, c0, 0 @ ctrl register
mcr p15, 0, ip, c7, c7, 0 @ invalidate L1 caches and BTB
bic r1, r1, #0x0001 @ ...............M
mcr p15, 0, r1, c1, c0, 0 @ ctrl register
@ CAUTION: MMU turned off from this point. We count on the pipeline
@ already containing those two last instructions to survive.
mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
mov pc, r0
/*
* cpu_xsc3_do_idle()
*
* Cause the processor to idle
*
* For now we do nothing but go to idle mode for every case
*
* XScale supports clock switching, but using idle mode support
* allows external hardware to react to system state changes.
*/
.align 5
ENTRY(cpu_xsc3_do_idle)
mov r0, #1
mcr p14, 0, r0, c7, c0, 0 @ go to idle
mov pc, lr
/* ================================= CACHE ================================ */
/*
* flush_user_cache_all()
*
* Invalidate all cache entries in a particular address
* space.
*/
ENTRY(xsc3_flush_user_cache_all)
/* FALLTHROUGH */
/*
* flush_kern_cache_all()
*
* Clean and invalidate the entire cache.
*/
ENTRY(xsc3_flush_kern_cache_all)
mov r2, #VM_EXEC
mov ip, #0
__flush_whole_cache:
clean_d_cache r0, r1
tst r2, #VM_EXEC
mcrne p15, 0, ip, c7, c5, 0 @ invalidate L1 I cache and BTB
mcrne p15, 0, ip, c7, c10, 4 @ data write barrier
mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush
mov pc, lr
/*
* flush_user_cache_range(start, end, vm_flags)
*
* Invalidate a range of cache entries in the specified
* address space.
*
* - start - start address (may not be aligned)
* - end - end address (exclusive, may not be aligned)
* - vma - vma_area_struct describing address space
*/
.align 5
ENTRY(xsc3_flush_user_cache_range)
mov ip, #0
sub r3, r1, r0 @ calculate total size
cmp r3, #MAX_AREA_SIZE
bhs __flush_whole_cache
1: tst r2, #VM_EXEC
mcrne p15, 0, r0, c7, c5, 1 @ invalidate L1 I line
mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
add r0, r0, #CACHELINESIZE
cmp r0, r1
blo 1b
tst r2, #VM_EXEC
mcrne p15, 0, ip, c7, c5, 6 @ invalidate BTB
mcrne p15, 0, ip, c7, c10, 4 @ data write barrier
mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush
mov pc, lr
/*
* coherent_kern_range(start, end)
*
* Ensure coherency between the I cache and the D cache in the
* region described by start. If you have non-snooping
* Harvard caches, you need to implement this function.
*
* - start - virtual start address
* - end - virtual end address
*
* Note: single I-cache line invalidation isn't used here since
* it also trashes the mini I-cache used by JTAG debuggers.
*/
ENTRY(xsc3_coherent_kern_range)
/* FALLTHROUGH */
ENTRY(xsc3_coherent_user_range)
bic r0, r0, #CACHELINESIZE - 1
1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
add r0, r0, #CACHELINESIZE
cmp r0, r1
blo 1b
mov r0, #0
mcr p15, 0, r0, c7, c5, 0 @ invalidate L1 I cache and BTB
mcr p15, 0, r0, c7, c10, 4 @ data write barrier
mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
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
*/
ENTRY(xsc3_flush_kern_dcache_page)
add r1, r0, #PAGE_SZ
1: mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
add r0, r0, #CACHELINESIZE
cmp r0, r1
blo 1b
mov r0, #0
mcr p15, 0, r0, c7, c5, 0 @ invalidate L1 I cache and BTB
mcr p15, 0, r0, c7, c10, 4 @ data write barrier
mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
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
*/
ENTRY(xsc3_dma_inv_range)
tst r0, #CACHELINESIZE - 1
bic r0, r0, #CACHELINESIZE - 1
mcrne p15, 0, r0, c7, c10, 1 @ clean L1 D line
tst r1, #CACHELINESIZE - 1
mcrne p15, 0, r1, c7, c10, 1 @ clean L1 D line
1: mcr p15, 0, r0, c7, c6, 1 @ invalidate L1 D line
add r0, r0, #CACHELINESIZE
cmp r0, r1
blo 1b
mcr p15, 0, r0, c7, c10, 4 @ data write barrier
mov pc, lr
/*
* dma_clean_range(start, end)
*
* Clean the specified virtual address range.
*
* - start - virtual start address
* - end - virtual end address
*/
ENTRY(xsc3_dma_clean_range)
bic r0, r0, #CACHELINESIZE - 1
1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
add r0, r0, #CACHELINESIZE
cmp r0, r1
blo 1b
mcr p15, 0, r0, c7, c10, 4 @ data write barrier
mov pc, lr
/*
* dma_flush_range(start, end)
*
* Clean and invalidate the specified virtual address range.
*
* - start - virtual start address
* - end - virtual end address
*/
ENTRY(xsc3_dma_flush_range)
bic r0, r0, #CACHELINESIZE - 1
1: mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
add r0, r0, #CACHELINESIZE
cmp r0, r1
blo 1b
mcr p15, 0, r0, c7, c10, 4 @ data write barrier
mov pc, lr
ENTRY(xsc3_cache_fns)
.long xsc3_flush_kern_cache_all
.long xsc3_flush_user_cache_all
.long xsc3_flush_user_cache_range
.long xsc3_coherent_kern_range
.long xsc3_coherent_user_range
.long xsc3_flush_kern_dcache_page
.long xsc3_dma_inv_range
.long xsc3_dma_clean_range
.long xsc3_dma_flush_range
ENTRY(cpu_xsc3_dcache_clean_area)
1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
add r0, r0, #CACHELINESIZE
subs r1, r1, #CACHELINESIZE
bhi 1b
mov pc, lr
/* =============================== PageTable ============================== */
/*
* cpu_xsc3_switch_mm(pgd)
*
* Set the translation base pointer to be as described by pgd.
*
* pgd: new page tables
*/
.align 5
ENTRY(cpu_xsc3_switch_mm)
clean_d_cache r1, r2
mcr p15, 0, ip, c7, c5, 0 @ invalidate L1 I cache and BTB
mcr p15, 0, ip, c7, c10, 4 @ data write barrier
mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
orr r0, r0, #0x18 @ cache the page table in L2
mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
cpwait_ret lr, ip
/*
* cpu_xsc3_set_pte_ext(ptep, pte, ext)
*
* Set a PTE and flush it out
*
*/
.align 5
ENTRY(cpu_xsc3_set_pte_ext)
str r1, [r0], #-2048 @ linux version
bic r2, r1, #0xff0 @ keep C, B bits
orr r2, r2, #PTE_TYPE_EXT @ extended page
tst r1, #L_PTE_SHARED @ shared?
orrne r2, r2, #0x200
eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
tst r3, #L_PTE_USER @ user?
orrne r2, r2, #PTE_EXT_AP_URO_SRW @ yes -> user r/o, system r/w
tst r3, #L_PTE_WRITE | L_PTE_DIRTY @ write and dirty?
orreq r2, r2, #PTE_EXT_AP_UNO_SRW @ yes -> user n/a, system r/w
@ combined with user -> user r/w
@ If it's cacheable, it needs to be in L2 also.
eor ip, r1, #L_PTE_CACHEABLE
tst ip, #L_PTE_CACHEABLE
orreq r2, r2, #PTE_EXT_TEX(0x5)
tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ present and young?
movne r2, #0 @ no -> fault
str r2, [r0] @ hardware version
mov ip, #0
mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
mcr p15, 0, ip, c7, c10, 4 @ data write barrier
mov pc, lr
.ltorg
.align
__INIT
.type __xsc3_setup, #function
__xsc3_setup:
mov r0, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
msr cpsr_c, r0
mcr p15, 0, ip, c7, c7, 0 @ invalidate L1 caches and BTB
mcr p15, 0, ip, c7, c10, 4 @ data write barrier
mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
orr r4, r4, #0x18 @ cache the page table in L2
mcr p15, 0, r4, c2, c0, 0 @ load page table pointer
mov r0, #0 @ don't allow CP access
mcr p15, 0, r0, c15, c1, 0 @ write CP access register
mrc p15, 0, r0, c1, c0, 1 @ get auxiliary control reg
and r0, r0, #2 @ preserve bit P bit setting
orr r0, r0, #(1 << 10) @ enable L2 for LLR cache
mcr p15, 0, r0, c1, c0, 1 @ set auxiliary control reg
adr r5, xsc3_crval
ldmia r5, {r5, r6}
mrc p15, 0, r0, c1, c0, 0 @ get control register
bic r0, r0, r5 @ ..V. ..R. .... ..A.
orr r0, r0, r6 @ ..VI Z..S .... .C.M (mmu)
@ ...I Z..S .... .... (uc)
mov pc, lr
.size __xsc3_setup, . - __xsc3_setup
.type xsc3_crval, #object
xsc3_crval:
crval clear=0x04002202, mmuset=0x00003905, ucset=0x00001900
__INITDATA
/*
* Purpose : Function pointers used to access above functions - all calls
* come through these
*/
.type xsc3_processor_functions, #object
ENTRY(xsc3_processor_functions)
.word v5t_early_abort
.word pabort_noifar
.word cpu_xsc3_proc_init
.word cpu_xsc3_proc_fin
.word cpu_xsc3_reset
.word cpu_xsc3_do_idle
.word cpu_xsc3_dcache_clean_area
.word cpu_xsc3_switch_mm
.word cpu_xsc3_set_pte_ext
.size xsc3_processor_functions, . - xsc3_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_xsc3_name, #object
cpu_xsc3_name:
.asciz "XScale-V3 based processor"
.size cpu_xsc3_name, . - cpu_xsc3_name
.align
.section ".proc.info.init", #alloc, #execinstr
.type __xsc3_proc_info,#object
__xsc3_proc_info:
.long 0x69056000
.long 0xffffe000
.long PMD_TYPE_SECT | \
PMD_SECT_BUFFERABLE | \
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xsc3_setup
.long cpu_arch_name
.long cpu_elf_name
.long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
.long cpu_xsc3_name
.long xsc3_processor_functions
.long v4wbi_tlb_fns
.long xsc3_mc_user_fns
.long xsc3_cache_fns
.size __xsc3_proc_info, . - __xsc3_proc_info
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