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/* MN10300 CPU cache invalidation routines, using automatic purge registers
*
* Copyright (C) 2011 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>
#include <asm/cacheflush.h>
#include "cache.inc"
.am33_2
###############################################################################
#
# void debugger_local_cache_flushinv(void)
# Flush the entire data cache back to RAM and invalidate the icache
#
###############################################################################
ALIGN
.globl debugger_local_cache_flushinv
.type debugger_local_cache_flushinv,@function
debugger_local_cache_flushinv:
#
# firstly flush the dcache
#
movhu (CHCTR),d0
btst CHCTR_DCEN|CHCTR_ICEN,d0
beq debugger_local_cache_flushinv_end
mov DCPGCR,a0
mov epsw,d1
and ~EPSW_IE,epsw
or EPSW_NMID,epsw
nop
btst CHCTR_DCEN,d0
beq debugger_local_cache_flushinv_no_dcache
# 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
debugger_local_cache_flushinv_no_dcache:
#
# secondly, invalidate the icache if it is enabled
#
mov CHCTR,a0
movhu (a0),d0
btst CHCTR_ICEN,d0
beq debugger_local_cache_flushinv_done
invalidate_icache 0
debugger_local_cache_flushinv_done:
mov d1,epsw
debugger_local_cache_flushinv_end:
ret [],0
.size debugger_local_cache_flushinv,.-debugger_local_cache_flushinv
###############################################################################
#
# void debugger_local_cache_flushinv_one(u8 *addr)
#
# Invalidate one particular cacheline if it's in the icache
#
###############################################################################
ALIGN
.globl debugger_local_cache_flushinv_one
.type debugger_local_cache_flushinv_one,@function
debugger_local_cache_flushinv_one:
movhu (CHCTR),d1
btst CHCTR_DCEN|CHCTR_ICEN,d1
beq debugger_local_cache_flushinv_one_end
btst CHCTR_DCEN,d1
beq debugger_local_cache_flushinv_one_no_dcache
# round cacheline addr down
and L1_CACHE_TAG_MASK,d0
mov d0,a1
mov d0,d1
# determine the dcache purge control reg address
mov DCACHE_PURGE(0,0),a0
and L1_CACHE_TAG_ENTRY,d0
add d0,a0
# retain valid entries in the cache
or L1_CACHE_TAG_VALID,d1
# conditionally purge this line in all ways
mov d1,(L1_CACHE_WAYDISP*0,a0)
debugger_local_cache_flushinv_one_no_dcache:
#
# now try to flush the icache
#
mov CHCTR,a0
movhu (a0),d0
btst CHCTR_ICEN,d0
beq debugger_local_cache_flushinv_one_end
LOCAL_CLI_SAVE(d1)
mov ICIVCR,a0
# wait for the invalidator to quiesce
setlb
mov (a0),d0
btst ICIVCR_ICIVBSY,d0
lne
# set the mask
mov L1_CACHE_TAG_MASK,d0
mov d0,(ICIVMR)
# invalidate the cache line at the given address
or ICIVCR_ICI,a1
mov a1,(a0)
# wait for the invalidator to quiesce again
setlb
mov (a0),d0
btst ICIVCR_ICIVBSY,d0
lne
LOCAL_IRQ_RESTORE(d1)
debugger_local_cache_flushinv_one_end:
ret [],0
.size debugger_local_cache_flushinv_one,.-debugger_local_cache_flushinv_one
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