/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* linux / arch / arm / mm / proc - feroceon . S : MMU functions for Feroceon
*
* Heavily based on proc - arm926 . S
* Maintainer : Assaf Hoffman < hoffman @ marvell . com >
*/
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/cfi_types.h>
#include <linux/pgtable.h>
#include <asm/assembler.h>
#include <asm/hwcap.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 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 ( )
*/
SYM_TYPED_FUNC_START(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, #0 xf
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}
#ifdef CONFIG_VFP
mov r1, #1 @ disable quirky VFP
str_l r1, VFP_arch_feroceon, r2
#endif
ret lr
SYM_FUNC_END(cpu_feroceon_proc_init)
/*
* cpu_feroceon_proc_fin ( )
*/
SYM_TYPED_FUNC_START(cpu_feroceon_proc_fin)
#if defined(CONFIG_CACHE_FEROCEON_L2) && \
!defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH)
mov r0, #0
mcr p15, 1 , r0, c15, c9, 0 @ clean L2
mcr p15, 0 , r0, c7, c10, 4 @ drain WB
#endif
mrc p15, 0 , r0, c1, c0, 0 @ ctrl register
bic r0, r0, #0 x1000 @ ...i............
bic r0, r0, #0 x000e @ ............wca.
mcr p15, 0 , r0, c1, c0, 0 @ disable caches
ret lr
SYM_FUNC_END(cpu_feroceon_proc_fin)
/*
* 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
.pushsection .idmap.text, "ax"
SYM_TYPED_FUNC_START(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, #0 x000f @ ............wcam
bic ip, ip, #0 x1100 @ ...i...s........
mcr p15, 0 , ip, c1, c0, 0 @ ctrl register
ret r0
SYM_FUNC_END(cpu_feroceon_reset)
.popsection
/*
* cpu_feroceon_do_idle ( )
*
* Called with IRQs disabled
*/
.align 5
SYM_TYPED_FUNC_START(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
ret lr
SYM_FUNC_END(cpu_feroceon_do_idle)
/*
* flush_icache_all ( )
*
* Unconditionally clean and invalidate the entire icache .
*/
SYM_TYPED_FUNC_START(feroceon_flush_icache_all)
mov r0, #0
mcr p15, 0 , r0, c7, c5, 0 @ invalidate I cache
ret lr
SYM_FUNC_END(feroceon_flush_icache_all)
/*
* flush_user_cache_all ( )
*
* Clean and invalidate all cache entries in a particular
* address space .
*/
.align 5
SYM_FUNC_ALIAS(feroceon_flush_user_cache_all, feroceon_flush_kern_cache_all)
/*
* flush_kern_cache_all ( )
*
* Clean and invalidate the entire cache .
*/
SYM_TYPED_FUNC_START(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 2 b
subs r1, r1, #(1 << 5 ) @ next set
bcs 1 b
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
ret lr
SYM_FUNC_END(feroceon_flush_kern_cache_all)
/*
* 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
SYM_TYPED_FUNC_START(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 1 b
tst r2, #VM_EXEC
mov ip, #0
mcrne p15, 0 , ip, c7, c10, 4 @ drain WB
ret lr
SYM_FUNC_END(feroceon_flush_user_cache_range)
/*
* 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
SYM_TYPED_FUNC_START(feroceon_coherent_kern_range)
#ifdef CONFIG_CFI_CLANG /* Fallthrough if !CFI */
b feroceon_coherent_user_range
#endif
SYM_FUNC_END(feroceon_coherent_kern_range)
/*
* 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
*/
SYM_TYPED_FUNC_START(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 1 b
mcr p15, 0 , r0, c7, c10, 4 @ drain WB
mov r0, #0
ret lr
SYM_FUNC_END(feroceon_coherent_user_range)
/*
* flush_kern_dcache_area ( void * addr , size_t size )
*
* Ensure no D cache aliasing occurs , either with itself or
* the I cache
*
* - addr - kernel address
* - size - region size
*/
.align 5
SYM_TYPED_FUNC_START(feroceon_flush_kern_dcache_area)
add r1, r0, r1
1 : mcr p15, 0 , r0, c7, c14, 1 @ clean+invalidate D entry
add r0, r0, #CACHE_DLINESIZE
cmp r0, r1
blo 1 b
mov r0, #0
mcr p15, 0 , r0, c7, c5, 0 @ invalidate I cache
mcr p15, 0 , r0, c7, c10, 4 @ drain WB
ret lr
SYM_FUNC_END(feroceon_flush_kern_dcache_area)
.align 5
SYM_TYPED_FUNC_START(feroceon_range_flush_kern_dcache_area)
mrs r2, cpsr
add r1, r0, #PAGE_SZ - CACHE_DLINESIZE @ top addr is inclusive
orr r3, r2, #PSR_I_BIT
msr cpsr_c, r3 @ disable interrupts
mcr p15, 5 , r0, c15, c15, 0 @ D clean/inv range start
mcr p15, 5 , r1, c15, c15, 1 @ D clean/inv range top
msr cpsr_c, r2 @ restore interrupts
mov r0, #0
mcr p15, 0 , r0, c7, c5, 0 @ invalidate I cache
mcr p15, 0 , r0, c7, c10, 4 @ drain WB
ret lr
SYM_FUNC_END(feroceon_range_flush_kern_dcache_area)
/*
* 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
feroceon_dma_inv_range:
tst r0, #CACHE_DLINESIZE - 1
bic r0, 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
1 : mcr p15, 0 , r0, c7, c6, 1 @ invalidate D entry
add r0, r0, #CACHE_DLINESIZE
cmp r0, r1
blo 1 b
mcr p15, 0 , r0, c7, c10, 4 @ drain WB
ret lr
.align 5
feroceon_range_dma_inv_range:
mrs r2, cpsr
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
cmp r1, r0
subne r1, r1, #1 @ top address is inclusive
orr r3, r2, #PSR_I_BIT
msr cpsr_c, r3 @ disable interrupts
mcr p15, 5 , r0, c15, c14, 0 @ D inv range start
mcr p15, 5 , r1, c15, c14, 1 @ D inv range top
msr cpsr_c, r2 @ restore interrupts
ret 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
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 1 b
mcr p15, 0 , r0, c7, c10, 4 @ drain WB
ret lr
.align 5
feroceon_range_dma_clean_range:
mrs r2, cpsr
cmp r1, r0
subne r1, r1, #1 @ top address is inclusive
orr r3, r2, #PSR_I_BIT
msr cpsr_c, r3 @ disable interrupts
mcr p15, 5 , r0, c15, c13, 0 @ D clean range start
mcr p15, 5 , r1, c15, c13, 1 @ D clean range top
msr cpsr_c, r2 @ restore interrupts
mcr p15, 0 , r0, c7, c10, 4 @ drain WB
ret lr
/*
* dma_flush_range ( start , end )
*
* Clean and invalidate the specified virtual address range .
*
* - start - virtual start address
* - end - virtual end address
*/
.align 5
SYM_TYPED_FUNC_START(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 1 b
mcr p15, 0 , r0, c7, c10, 4 @ drain WB
ret lr
SYM_FUNC_END(feroceon_dma_flush_range)
.align 5
SYM_TYPED_FUNC_START(feroceon_range_dma_flush_range)
mrs r2, cpsr
cmp r1, r0
subne r1, r1, #1 @ top address is inclusive
orr r3, r2, #PSR_I_BIT
msr cpsr_c, r3 @ disable interrupts
mcr p15, 5 , r0, c15, c15, 0 @ D clean/inv range start
mcr p15, 5 , r1, c15, c15, 1 @ D clean/inv range top
msr cpsr_c, r2 @ restore interrupts
mcr p15, 0 , r0, c7, c10, 4 @ drain WB
ret lr
SYM_FUNC_END(feroceon_range_dma_flush_range)
/*
* dma_map_area ( start , size , dir )
* - start - kernel virtual start address
* - size - size of region
* - dir - DMA direction
*/
SYM_TYPED_FUNC_START(feroceon_dma_map_area)
add r1, r1, r0
cmp r2, #DMA_TO_DEVICE
beq feroceon_dma_clean_range
bcs feroceon_dma_inv_range
b feroceon_dma_flush_range
SYM_FUNC_END(feroceon_dma_map_area)
/*
* dma_map_area ( start , size , dir )
* - start - kernel virtual start address
* - size - size of region
* - dir - DMA direction
*/
SYM_TYPED_FUNC_START(feroceon_range_dma_map_area)
add r1, r1, r0
cmp r2, #DMA_TO_DEVICE
beq feroceon_range_dma_clean_range
bcs feroceon_range_dma_inv_range
b feroceon_range_dma_flush_range
SYM_FUNC_END(feroceon_range_dma_map_area)
/*
* dma_unmap_area ( start , size , dir )
* - start - kernel virtual start address
* - size - size of region
* - dir - DMA direction
*/
SYM_TYPED_FUNC_START(feroceon_dma_unmap_area)
ret lr
SYM_FUNC_END(feroceon_dma_unmap_area)
.align 5
SYM_TYPED_FUNC_START(cpu_feroceon_dcache_clean_area)
#if defined(CONFIG_CACHE_FEROCEON_L2) && \
!defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH)
mov r2, r0
mov r3, r1
#endif
1 : mcr p15, 0 , r0, c7, c10, 1 @ clean D entry
add r0, r0, #CACHE_DLINESIZE
subs r1, r1, #CACHE_DLINESIZE
bhi 1 b
#if defined(CONFIG_CACHE_FEROCEON_L2) && \
!defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH)
1 : mcr p15, 1 , r2, c15, c9, 1 @ clean L2 entry
add r2, r2, #CACHE_DLINESIZE
subs r3, r3, #CACHE_DLINESIZE
bhi 1 b
#endif
mcr p15, 0 , r0, c7, c10, 4 @ drain WB
ret lr
SYM_FUNC_END(cpu_feroceon_dcache_clean_area)
/* =============================== PageTable ============================== */
/*
* cpu_feroceon_switch_mm ( pgd )
*
* Set the translation base pointer to be as described by pgd .
*
* pgd : new page tables
*/
.align 5
SYM_TYPED_FUNC_START(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
ret r2
#else
ret lr
#endif
SYM_FUNC_END(cpu_feroceon_switch_mm)
/*
* cpu_feroceon_set_pte_ext ( ptep , pte , ext )
*
* Set a PTE and flush it out
*/
.align 5
SYM_TYPED_FUNC_START(cpu_feroceon_set_pte_ext)
#ifdef CONFIG_MMU
armv3_set_pte_ext wc_disable=0
mov r0, r0
mcr p15, 0 , r0, c7, c10, 1 @ clean D entry
#if defined(CONFIG_CACHE_FEROCEON_L2) && \
!defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH)
mcr p15, 1 , r0, c15, c9, 1 @ clean L2 entry
#endif
mcr p15, 0 , r0, c7, c10, 4 @ drain WB
#endif
ret lr
SYM_FUNC_END(cpu_feroceon_set_pte_ext)
/* Suspend/resume support: taken from arch/arm/mm/proc-arm926.S */
.globl cpu_feroceon_suspend_size
.equ cpu_feroceon_suspend_size, 4 * 3
#ifdef CONFIG_ARM_CPU_SUSPEND
SYM_TYPED_FUNC_START(cpu_feroceon_do_suspend)
stmfd sp!, {r4 - r6, lr}
mrc p15, 0 , r4, c13, c0, 0 @ PID
mrc p15, 0 , r5, c3, c0, 0 @ Domain ID
mrc p15, 0 , r6, c1, c0, 0 @ Control register
stmia r0, {r4 - r6}
ldmfd sp!, {r4 - r6, pc}
SYM_FUNC_END(cpu_feroceon_do_suspend)
SYM_TYPED_FUNC_START(cpu_feroceon_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 - r6}
mcr p15, 0 , r4, c13, c0, 0 @ PID
mcr p15, 0 , r5, c3, c0, 0 @ Domain ID
mcr p15, 0 , r1, c2, c0, 0 @ TTB address
mov r0, r6 @ control register
b cpu_resume_mmu
SYM_FUNC_END(cpu_feroceon_do_resume)
#endif
.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
ret lr
.size __feroceon_setup, . - __feroceon_setup
/*
* B
* R P
* . RVI UFRS BLDP WCAM
* . 011 . 001 . . 11 0101
*
*/
.type feroceon_crval, #object
feroceon_crval:
crval clear=0 x0000773f, mmuset=0 x00003135, ucset=0 x00001134
__INITDATA
@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
define_processor_functions feroceon, dabort=v5t_early_abort, pabort=legacy_pabort
.section ".rodata"
string cpu_arch_name, "armv5te"
string cpu_elf_name, "v5"
string cpu_feroceon_name, "Feroceon"
string cpu_88fr531_name, "Feroceon 88FR531-vd"
string cpu_88fr571_name, "Feroceon 88FR571-vd"
string cpu_88fr131_name, "Feroceon 88FR131"
.align
.section ".proc.info.init" , "a"
.macro feroceon_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req, cache:req
.type __\name\()_proc_info,#object
__\name\()_proc_info:
.long \cpu_val
.long \cpu_mask
.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
initfn __feroceon_setup, __\name\()_proc_info
.long cpu_arch_name
.long cpu_elf_name
.long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
.long \cpu_name
.long feroceon_processor_functions
.long v4wbi_tlb_fns
.long feroceon_user_fns
.long \cache
.size __\name\()_proc_info, . - __\name\()_proc_info
.endm
#ifdef CONFIG_CPU_FEROCEON_OLD_ID
feroceon_proc_info feroceon_old_id, 0 x41009260, 0 xff00fff0, \
cpu_name=cpu_feroceon_name, cache=feroceon_cache_fns
#endif
feroceon_proc_info 88 fr531, 0 x56055310, 0 xfffffff0, cpu_88fr531_name, \
cache=feroceon_cache_fns
feroceon_proc_info 88 fr571, 0 x56155710, 0 xfffffff0, cpu_88fr571_name, \
cache=feroceon_range_cache_fns
feroceon_proc_info 88 fr131, 0 x56251310, 0 xfffffff0, cpu_88fr131_name, \
cache=feroceon_range_cache_fns
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