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>
290 lines
6.3 KiB
ArmAsm
290 lines
6.3 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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#define mn10300_dcache_inv_range_intr_interval \
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+((1 << MN10300_DCACHE_INV_RANGE_INTR_LOG2_INTERVAL) - 1)
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#if mn10300_dcache_inv_range_intr_interval > 0xff
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#error MN10300_DCACHE_INV_RANGE_INTR_LOG2_INTERVAL must be 8 or less
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#endif
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.am33_2
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.globl mn10300_icache_inv
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.globl mn10300_dcache_inv
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.globl mn10300_dcache_inv_range
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.globl mn10300_dcache_inv_range2
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.globl mn10300_dcache_inv_page
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###############################################################################
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#
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# void mn10300_icache_inv(void)
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# Invalidate the entire icache
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#
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###############################################################################
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ALIGN
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mn10300_icache_inv:
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mov CHCTR,a0
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movhu (a0),d0
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btst CHCTR_ICEN,d0
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beq mn10300_icache_inv_end
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mov epsw,d1
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and ~EPSW_IE,epsw
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nop
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nop
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# disable the icache
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and ~CHCTR_ICEN,d0
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movhu d0,(a0)
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# and wait for it to calm down
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setlb
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movhu (a0),d0
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btst CHCTR_ICBUSY,d0
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lne
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# invalidate
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or CHCTR_ICINV,d0
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movhu d0,(a0)
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# wait for the cache to finish
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mov CHCTR,a0
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setlb
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movhu (a0),d0
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btst CHCTR_ICBUSY,d0
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lne
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# and reenable it
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and ~CHCTR_ICINV,d0
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or CHCTR_ICEN,d0
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movhu d0,(a0)
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movhu (a0),d0
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mov d1,epsw
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mn10300_icache_inv_end:
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ret [],0
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###############################################################################
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#
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# void mn10300_dcache_inv(void)
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# Invalidate the entire dcache
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#
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###############################################################################
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ALIGN
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mn10300_dcache_inv:
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mov CHCTR,a0
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movhu (a0),d0
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btst CHCTR_DCEN,d0
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beq mn10300_dcache_inv_end
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mov epsw,d1
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and ~EPSW_IE,epsw
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nop
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nop
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# disable the dcache
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and ~CHCTR_DCEN,d0
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movhu d0,(a0)
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# and wait for it to calm down
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setlb
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movhu (a0),d0
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btst CHCTR_DCBUSY,d0
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lne
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# invalidate
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or CHCTR_DCINV,d0
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movhu d0,(a0)
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# wait for the cache to finish
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mov CHCTR,a0
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setlb
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movhu (a0),d0
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btst CHCTR_DCBUSY,d0
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lne
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# and reenable it
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and ~CHCTR_DCINV,d0
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or CHCTR_DCEN,d0
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movhu d0,(a0)
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movhu (a0),d0
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mov d1,epsw
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mn10300_dcache_inv_end:
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ret [],0
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###############################################################################
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#
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# void mn10300_dcache_inv_range(unsigned start, unsigned end)
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# void mn10300_dcache_inv_range2(unsigned start, unsigned size)
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# void mn10300_dcache_inv_page(unsigned start)
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# 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_inv_page:
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mov PAGE_SIZE,d1
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mn10300_dcache_inv_range2:
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add d0,d1
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mn10300_dcache_inv_range:
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movm [d2,d3,a2],(sp)
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mov CHCTR,a2
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movhu (a2),d2
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btst CHCTR_DCEN,d2
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beq mn10300_dcache_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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clr d2 # we're going to clear tag ram
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# entries
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# read the tags from the tag RAM, and if they indicate a valid dirty
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# cache line then invalidate that line
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mov DCACHE_TAG(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 tag RAM
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# access 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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and ~(L1_CACHE_DISPARITY-1),a1 # determine comparator base
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mn10300_dcache_inv_range_outer_loop:
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# disable interrupts
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mov epsw,d3
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and ~EPSW_IE,epsw
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nop # note that reading CHCTR and
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# AND'ing D0 occupy two delay
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# slots after disabling
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# interrupts
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# disable the dcache
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movhu (a2),d0
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and ~CHCTR_DCEN,d0
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movhu d0,(a2)
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# and wait for it to calm down
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setlb
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movhu (a2),d0
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btst CHCTR_DCBUSY,d0
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lne
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mn10300_dcache_inv_range_loop:
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# process the way 0 slot
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mov (L1_CACHE_WAYDISP*0,a0),d0 # read the tag in the way 0 slot
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btst L1_CACHE_TAG_VALID,d0
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beq mn10300_dcache_inv_range_skip_0 # jump if this cacheline is not
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# valid
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xor a1,d0
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lsr 12,d0
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bne mn10300_dcache_inv_range_skip_0 # jump if not this cacheline
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mov d2,(a0) # kill the tag
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mn10300_dcache_inv_range_skip_0:
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# process the way 1 slot
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mov (L1_CACHE_WAYDISP*1,a0),d0 # read the tag in the way 1 slot
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btst L1_CACHE_TAG_VALID,d0
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beq mn10300_dcache_inv_range_skip_1 # jump if this cacheline is not
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# valid
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xor a1,d0
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lsr 12,d0
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bne mn10300_dcache_inv_range_skip_1 # jump if not this cacheline
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mov d2,(a0) # kill the tag
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mn10300_dcache_inv_range_skip_1:
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# process the way 2 slot
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mov (L1_CACHE_WAYDISP*2,a0),d0 # read the tag in the way 2 slot
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btst L1_CACHE_TAG_VALID,d0
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beq mn10300_dcache_inv_range_skip_2 # jump if this cacheline is not
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# valid
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xor a1,d0
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lsr 12,d0
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bne mn10300_dcache_inv_range_skip_2 # jump if not this cacheline
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mov d2,(a0) # kill the tag
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mn10300_dcache_inv_range_skip_2:
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# process the way 3 slot
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mov (L1_CACHE_WAYDISP*3,a0),d0 # read the tag in the way 3 slot
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btst L1_CACHE_TAG_VALID,d0
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beq mn10300_dcache_inv_range_skip_3 # jump if this cacheline is not
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# valid
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xor a1,d0
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lsr 12,d0
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bne mn10300_dcache_inv_range_skip_3 # jump if not this cacheline
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mov d2,(a0) # kill the tag
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mn10300_dcache_inv_range_skip_3:
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# approx every N steps we re-enable the cache and see if there are any
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# interrupts to be processed
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# we also break out if we've reached the end of the loop
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# (the bottom nibble of the count is zero in both cases)
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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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btst mn10300_dcache_inv_range_intr_interval,d1
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bne mn10300_dcache_inv_range_loop
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# wait for the cache to finish what it's doing
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setlb
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movhu (a2),d0
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btst CHCTR_DCBUSY,d0
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lne
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# and reenable it
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or CHCTR_DCEN,d0
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movhu d0,(a2)
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movhu (a2),d0
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# re-enable interrupts
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# - we don't bother with delay NOPs as we'll have enough instructions
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# before we disable interrupts again to give the interrupts a chance
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# to happen
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mov d3,epsw
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# go around again if the counter hasn't yet reached zero
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add 0,d1
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bne mn10300_dcache_inv_range_outer_loop
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mn10300_dcache_inv_range_end:
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ret [d2,d3,a2],12
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