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https://github.com/edk2-porting/linux-next.git
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b920de1b77
Add architecture support for the MN10300/AM33 CPUs produced by MEI to the kernel. This patch also adds board support for the ASB2303 with the ASB2308 daughter board, and the ASB2305. The only processor supported is the MN103E010, which is an AM33v2 core plus on-chip devices. [akpm@linux-foundation.org: nuke cvs control strings] Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com> Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
193 lines
5.4 KiB
ArmAsm
193 lines
5.4 KiB
ArmAsm
/* MN10300 CPU core caching routines
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/sys.h>
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#include <linux/linkage.h>
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#include <asm/smp.h>
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#include <asm/page.h>
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#include <asm/cache.h>
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.am33_2
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.globl mn10300_dcache_flush
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.globl mn10300_dcache_flush_page
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.globl mn10300_dcache_flush_range
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.globl mn10300_dcache_flush_range2
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.globl mn10300_dcache_flush_inv
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.globl mn10300_dcache_flush_inv_page
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.globl mn10300_dcache_flush_inv_range
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.globl mn10300_dcache_flush_inv_range2
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###############################################################################
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#
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# void mn10300_dcache_flush(void)
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# Flush the entire data cache back to RAM
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#
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###############################################################################
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ALIGN
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mn10300_dcache_flush:
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movhu (CHCTR),d0
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btst CHCTR_DCEN,d0
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beq mn10300_dcache_flush_end
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# read the addresses tagged in the cache's tag RAM and attempt to flush
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# those addresses specifically
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# - we rely on the hardware to filter out invalid tag entry addresses
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mov DCACHE_TAG(0,0),a0 # dcache tag RAM access address
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mov DCACHE_PURGE(0,0),a1 # dcache purge request address
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mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,d1 # total number of entries
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mn10300_dcache_flush_loop:
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mov (a0),d0
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and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0
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or L1_CACHE_TAG_VALID,d0 # retain valid entries in the
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# cache
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mov d0,(a1) # conditional purge
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mn10300_dcache_flush_skip:
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add L1_CACHE_BYTES,a0
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add L1_CACHE_BYTES,a1
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add -1,d1
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bne mn10300_dcache_flush_loop
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mn10300_dcache_flush_end:
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ret [],0
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###############################################################################
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#
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# void mn10300_dcache_flush_page(unsigned start)
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# void mn10300_dcache_flush_range(unsigned start, unsigned end)
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# void mn10300_dcache_flush_range2(unsigned start, unsigned size)
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# Flush a range of addresses on a page in the dcache
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#
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###############################################################################
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ALIGN
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mn10300_dcache_flush_page:
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mov PAGE_SIZE,d1
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mn10300_dcache_flush_range2:
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add d0,d1
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mn10300_dcache_flush_range:
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movm [d2,d3],(sp)
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movhu (CHCTR),d2
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btst CHCTR_DCEN,d2
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beq mn10300_dcache_flush_range_end
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# round start addr down
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and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0
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mov d0,a1
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add L1_CACHE_BYTES,d1 # round end addr up
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and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d1
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# write a request to flush all instances of an address from the cache
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mov DCACHE_PURGE(0,0),a0
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mov a1,d0
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and L1_CACHE_TAG_ENTRY,d0
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add d0,a0 # starting dcache purge control
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# reg address
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sub a1,d1
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lsr L1_CACHE_SHIFT,d1 # total number of entries to
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# examine
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or L1_CACHE_TAG_VALID,a1 # retain valid entries in the
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# cache
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mn10300_dcache_flush_range_loop:
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mov a1,(L1_CACHE_WAYDISP*0,a0) # conditionally purge this line
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# all ways
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add L1_CACHE_BYTES,a0
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add L1_CACHE_BYTES,a1
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and ~L1_CACHE_WAYDISP,a0 # make sure way stay on way 0
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add -1,d1
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bne mn10300_dcache_flush_range_loop
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mn10300_dcache_flush_range_end:
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ret [d2,d3],8
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###############################################################################
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#
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# void mn10300_dcache_flush_inv(void)
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# Flush the entire data cache and invalidate all entries
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#
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###############################################################################
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ALIGN
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mn10300_dcache_flush_inv:
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movhu (CHCTR),d0
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btst CHCTR_DCEN,d0
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beq mn10300_dcache_flush_inv_end
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# hit each line in the dcache with an unconditional purge
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mov DCACHE_PURGE(0,0),a1 # dcache purge request address
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mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,d1 # total number of entries
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mn10300_dcache_flush_inv_loop:
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mov (a1),d0 # unconditional purge
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add L1_CACHE_BYTES,a1
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add -1,d1
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bne mn10300_dcache_flush_inv_loop
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mn10300_dcache_flush_inv_end:
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ret [],0
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###############################################################################
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#
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# void mn10300_dcache_flush_inv_page(unsigned start)
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# void mn10300_dcache_flush_inv_range(unsigned start, unsigned end)
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# void mn10300_dcache_flush_inv_range2(unsigned start, unsigned size)
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# Flush and invalidate a range of addresses on a page in the dcache
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#
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###############################################################################
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ALIGN
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mn10300_dcache_flush_inv_page:
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mov PAGE_SIZE,d1
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mn10300_dcache_flush_inv_range2:
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add d0,d1
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mn10300_dcache_flush_inv_range:
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movm [d2,d3],(sp)
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movhu (CHCTR),d2
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btst CHCTR_DCEN,d2
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beq mn10300_dcache_flush_inv_range_end
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and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0 # round start
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# addr down
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mov d0,a1
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add L1_CACHE_BYTES,d1 # round end addr up
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and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d1
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# write a request to flush and invalidate all instances of an address
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# from the cache
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mov DCACHE_PURGE(0,0),a0
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mov a1,d0
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and L1_CACHE_TAG_ENTRY,d0
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add d0,a0 # starting dcache purge control
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# reg address
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sub a1,d1
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lsr L1_CACHE_SHIFT,d1 # total number of entries to
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# examine
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mn10300_dcache_flush_inv_range_loop:
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mov a1,(L1_CACHE_WAYDISP*0,a0) # conditionally purge this line
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# in all ways
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add L1_CACHE_BYTES,a0
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add L1_CACHE_BYTES,a1
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and ~L1_CACHE_WAYDISP,a0 # make sure way stay on way 0
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add -1,d1
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bne mn10300_dcache_flush_inv_range_loop
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mn10300_dcache_flush_inv_range_end:
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ret [d2,d3],8
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