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linux/arch/mn10300/mm/cache-flush-by-reg.S
Akira Takeuchi 9731d23710 MN10300: AM34: Add cacheflushing by using the AM34 purge registers 
The AM34 CPU core provides an automated way of purging the cache rather than
manually iterating over all the tags in the cache.  Make it possible to use
these.

Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
2010-10-27 17:28:45 +01:00

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/* MN10300 CPU core caching routines, using indirect regs on cache controller
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/smp.h>
#include <asm/page.h>
#include <asm/cache.h>
#include <asm/irqflags.h>
.am33_2
#ifndef CONFIG_SMP
.globl mn10300_dcache_flush
.globl mn10300_dcache_flush_page
.globl mn10300_dcache_flush_range
.globl mn10300_dcache_flush_range2
.globl mn10300_dcache_flush_inv
.globl mn10300_dcache_flush_inv_page
.globl mn10300_dcache_flush_inv_range
.globl mn10300_dcache_flush_inv_range2
mn10300_dcache_flush = mn10300_local_dcache_flush
mn10300_dcache_flush_page = mn10300_local_dcache_flush_page
mn10300_dcache_flush_range = mn10300_local_dcache_flush_range
mn10300_dcache_flush_range2 = mn10300_local_dcache_flush_range2
mn10300_dcache_flush_inv = mn10300_local_dcache_flush_inv
mn10300_dcache_flush_inv_page = mn10300_local_dcache_flush_inv_page
mn10300_dcache_flush_inv_range = mn10300_local_dcache_flush_inv_range
mn10300_dcache_flush_inv_range2 = mn10300_local_dcache_flush_inv_range2
#endif /* !CONFIG_SMP */
###############################################################################
#
# void mn10300_local_dcache_flush(void)
# Flush the entire data cache back to RAM
#
###############################################################################
ALIGN
.globl mn10300_local_dcache_flush
.type mn10300_local_dcache_flush,@function
mn10300_local_dcache_flush:
movhu (CHCTR),d0
btst CHCTR_DCEN,d0
beq mn10300_local_dcache_flush_end
mov DCPGCR,a0
LOCAL_CLI_SAVE(d1)
# wait for busy bit of area purge
setlb
mov (a0),d0
btst DCPGCR_DCPGBSY,d0
lne
# set mask
clr d0
mov d0,(DCPGMR)
# area purge
#
# DCPGCR = DCPGCR_DCP
#
mov DCPGCR_DCP,d0
mov d0,(a0)
# wait for busy bit of area purge
setlb
mov (a0),d0
btst DCPGCR_DCPGBSY,d0
lne
LOCAL_IRQ_RESTORE(d1)
mn10300_local_dcache_flush_end:
ret [],0
.size mn10300_local_dcache_flush,.-mn10300_local_dcache_flush
###############################################################################
#
# void mn10300_local_dcache_flush_page(unsigned long start)
# void mn10300_local_dcache_flush_range(unsigned long start, unsigned long end)
# void mn10300_local_dcache_flush_range2(unsigned long start, unsigned long size)
# Flush a range of addresses on a page in the dcache
#
###############################################################################
ALIGN
.globl mn10300_local_dcache_flush_page
.globl mn10300_local_dcache_flush_range
.globl mn10300_local_dcache_flush_range2
.type mn10300_local_dcache_flush_page,@function
.type mn10300_local_dcache_flush_range,@function
.type mn10300_local_dcache_flush_range2,@function
mn10300_local_dcache_flush_page:
and ~(PAGE_SIZE-1),d0
mov PAGE_SIZE,d1
mn10300_local_dcache_flush_range2:
add d0,d1
mn10300_local_dcache_flush_range:
movm [d2,d3,a2],(sp)
movhu (CHCTR),d2
btst CHCTR_DCEN,d2
beq mn10300_local_dcache_flush_range_end
# calculate alignsize
#
# alignsize = L1_CACHE_BYTES;
# for (i = (end - start - 1) / L1_CACHE_BYTES ; i > 0; i >>= 1)
# alignsize <<= 1;
# d2 = alignsize;
#
mov L1_CACHE_BYTES,d2
sub d0,d1,d3
add -1,d3
lsr L1_CACHE_SHIFT,d3
beq 2f
1:
add d2,d2
lsr 1,d3
bne 1b
2:
mov d1,a1 # a1 = end
LOCAL_CLI_SAVE(d3)
mov DCPGCR,a0
# wait for busy bit of area purge
setlb
mov (a0),d1
btst DCPGCR_DCPGBSY,d1
lne
# determine the mask
mov d2,d1
add -1,d1
not d1 # d1 = mask = ~(alignsize-1)
mov d1,(DCPGMR)
and d1,d0,a2 # a2 = mask & start
dcpgloop:
# area purge
mov a2,d0
or DCPGCR_DCP,d0
mov d0,(a0) # DCPGCR = (mask & start) | DCPGCR_DCP
# wait for busy bit of area purge
setlb
mov (a0),d1
btst DCPGCR_DCPGBSY,d1
lne
# check purge of end address
add d2,a2 # a2 += alignsize
cmp a1,a2 # if (a2 < end) goto dcpgloop
bns dcpgloop
LOCAL_IRQ_RESTORE(d3)
mn10300_local_dcache_flush_range_end:
ret [d2,d3,a2],12
.size mn10300_local_dcache_flush_page,.-mn10300_local_dcache_flush_page
.size mn10300_local_dcache_flush_range,.-mn10300_local_dcache_flush_range
.size mn10300_local_dcache_flush_range2,.-mn10300_local_dcache_flush_range2
###############################################################################
#
# void mn10300_local_dcache_flush_inv(void)
# Flush the entire data cache and invalidate all entries
#
###############################################################################
ALIGN
.globl mn10300_local_dcache_flush_inv
.type mn10300_local_dcache_flush_inv,@function
mn10300_local_dcache_flush_inv:
movhu (CHCTR),d0
btst CHCTR_DCEN,d0
beq mn10300_local_dcache_flush_inv_end
mov DCPGCR,a0
LOCAL_CLI_SAVE(d1)
# wait for busy bit of area purge & invalidate
setlb
mov (a0),d0
btst DCPGCR_DCPGBSY,d0
lne
# set the mask to cover everything
clr d0
mov d0,(DCPGMR)
# area purge & invalidate
mov DCPGCR_DCP|DCPGCR_DCI,d0
mov d0,(a0)
# wait for busy bit of area purge & invalidate
setlb
mov (a0),d0
btst DCPGCR_DCPGBSY,d0
lne
LOCAL_IRQ_RESTORE(d1)
mn10300_local_dcache_flush_inv_end:
ret [],0
.size mn10300_local_dcache_flush_inv,.-mn10300_local_dcache_flush_inv
###############################################################################
#
# void mn10300_local_dcache_flush_inv_page(unsigned long start)
# void mn10300_local_dcache_flush_inv_range(unsigned long start, unsigned long end)
# void mn10300_local_dcache_flush_inv_range2(unsigned long start, unsigned long size)
# Flush and invalidate a range of addresses on a page in the dcache
#
###############################################################################
ALIGN
.globl mn10300_local_dcache_flush_inv_page
.globl mn10300_local_dcache_flush_inv_range
.globl mn10300_local_dcache_flush_inv_range2
.type mn10300_local_dcache_flush_inv_page,@function
.type mn10300_local_dcache_flush_inv_range,@function
.type mn10300_local_dcache_flush_inv_range2,@function
mn10300_local_dcache_flush_inv_page:
and ~(PAGE_SIZE-1),d0
mov PAGE_SIZE,d1
mn10300_local_dcache_flush_inv_range2:
add d0,d1
mn10300_local_dcache_flush_inv_range:
movm [d2,d3,a2],(sp)
movhu (CHCTR),d2
btst CHCTR_DCEN,d2
beq mn10300_local_dcache_flush_inv_range_end
# calculate alignsize
#
# alignsize = L1_CACHE_BYTES;
# for (i = (end - start - 1) / L1_CACHE_BYTES; i > 0; i >>= 1)
# alignsize <<= 1;
# d2 = alignsize
#
mov L1_CACHE_BYTES,d2
sub d0,d1,d3
add -1,d3
lsr L1_CACHE_SHIFT,d3
beq 2f
1:
add d2,d2
lsr 1,d3
bne 1b
2:
mov d1,a1 # a1 = end
LOCAL_CLI_SAVE(d3)
mov DCPGCR,a0
# wait for busy bit of area purge & invalidate
setlb
mov (a0),d1
btst DCPGCR_DCPGBSY,d1
lne
# set the mask
mov d2,d1
add -1,d1
not d1 # d1 = mask = ~(alignsize-1)
mov d1,(DCPGMR)
and d1,d0,a2 # a2 = mask & start
dcpgivloop:
# area purge & invalidate
mov a2,d0
or DCPGCR_DCP|DCPGCR_DCI,d0
mov d0,(a0) # DCPGCR = (mask & start)|DCPGCR_DCP|DCPGCR_DCI
# wait for busy bit of area purge & invalidate
setlb
mov (a0),d1
btst DCPGCR_DCPGBSY,d1
lne
# check purge & invalidate of end address
add d2,a2 # a2 += alignsize
cmp a1,a2 # if (a2 < end) goto dcpgivloop
bns dcpgivloop
LOCAL_IRQ_RESTORE(d3)
mn10300_local_dcache_flush_inv_range_end:
ret [d2,d3,a2],12
.size mn10300_local_dcache_flush_inv_page,.-mn10300_local_dcache_flush_inv_page
.size mn10300_local_dcache_flush_inv_range,.-mn10300_local_dcache_flush_inv_range
.size mn10300_local_dcache_flush_inv_range2,.-mn10300_local_dcache_flush_inv_range2
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