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/* head-uc-fr451.S: FR451 uc-linux specific bits of initialisation
*
* Copyright (C) 2004 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 License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/threads.h>
#include <linux/linkage.h>
#include <asm/ptrace.h>
#include <asm/page.h>
#include <asm/spr-regs.h>
#include <asm/mb86943a.h>
#include "head.inc"
#define __400_DBR0 0xfe000e00
#define __400_DBR1 0xfe000e08
#define __400_DBR2 0xfe000e10
#define __400_DBR3 0xfe000e18
#define __400_DAM0 0xfe000f00
#define __400_DAM1 0xfe000f08
#define __400_DAM2 0xfe000f10
#define __400_DAM3 0xfe000f18
#define __400_LGCR 0xfe000010
#define __400_LCR 0xfe000100
#define __400_LSBR 0xfe000c00
.section .text.init,"ax"
.balign 4
###############################################################################
#
# set the protection map with the I/DAMPR registers
#
# ENTRY: EXIT:
# GR25 SDRAM size [saved]
# GR26 &__head_reference [saved]
# GR30 LED address [saved]
#
###############################################################################
.globl __head_fr451_set_protection
__head_fr451_set_protection:
movsg lr,gr27
movgs gr0,dampr10
movgs gr0,damlr10
movgs gr0,dampr9
movgs gr0,damlr9
movgs gr0,dampr8
movgs gr0,damlr8
# set the I/O region protection registers for FR401/3/5
sethi.p %hi(__region_IO),gr5
setlo %lo(__region_IO),gr5
sethi.p %hi(0x1fffffff),gr7
setlo %lo(0x1fffffff),gr7
ori gr5,#xAMPRx_SS_512Mb|xAMPRx_S_KERNEL|xAMPRx_C|xAMPRx_V,gr5
movgs gr5,dampr11 ; General I/O tile
movgs gr7,damlr11
# need to tile the remaining IAMPR/DAMPR registers to cover as much of the RAM as possible
# - start with the highest numbered registers
sethi.p %hi(__kernel_image_end),gr8
setlo %lo(__kernel_image_end),gr8
sethi.p %hi(32768),gr4 ; allow for a maximal allocator bitmap
setlo %lo(32768),gr4
add gr8,gr4,gr8
sethi.p %hi(1024*2048-1),gr4 ; round up to nearest 2MiB
setlo %lo(1024*2048-1),gr4
add.p gr8,gr4,gr8
not gr4,gr4
and gr8,gr4,gr8
sethi.p %hi(__page_offset),gr9
setlo %lo(__page_offset),gr9
add gr9,gr25,gr9
sethi.p %hi(0xffffc000),gr11
setlo %lo(0xffffc000),gr11
# GR8 = base of uncovered RAM
# GR9 = top of uncovered RAM
# GR11 = xAMLR mask
LEDS 0x3317
call __head_split_region
movgs gr4,iampr7
movgs gr6,iamlr7
movgs gr5,dampr7
movgs gr7,damlr7
LEDS 0x3316
call __head_split_region
movgs gr4,iampr6
movgs gr6,iamlr6
movgs gr5,dampr6
movgs gr7,damlr6
LEDS 0x3315
call __head_split_region
movgs gr4,iampr5
movgs gr6,iamlr5
movgs gr5,dampr5
movgs gr7,damlr5
LEDS 0x3314
call __head_split_region
movgs gr4,iampr4
movgs gr6,iamlr4
movgs gr5,dampr4
movgs gr7,damlr4
LEDS 0x3313
call __head_split_region
movgs gr4,iampr3
movgs gr6,iamlr3
movgs gr5,dampr3
movgs gr7,damlr3
LEDS 0x3312
call __head_split_region
movgs gr4,iampr2
movgs gr6,iamlr2
movgs gr5,dampr2
movgs gr7,damlr2
LEDS 0x3311
call __head_split_region
movgs gr4,iampr1
movgs gr6,iamlr1
movgs gr5,dampr1
movgs gr7,damlr1
# cover kernel core image with kernel-only segment
LEDS 0x3310
sethi.p %hi(__page_offset),gr8
setlo %lo(__page_offset),gr8
call __head_split_region
#ifdef CONFIG_PROTECT_KERNEL
ori.p gr4,#xAMPRx_S_KERNEL,gr4
ori gr5,#xAMPRx_S_KERNEL,gr5
#endif
movgs gr4,iampr0
movgs gr6,iamlr0
movgs gr5,dampr0
movgs gr7,damlr0
# start in TLB context 0 with no page tables
movgs gr0,cxnr
movgs gr0,ttbr
# the FR451 also has an extra trap base register
movsg tbr,gr4
movgs gr4,btbr
# turn on the timers as appropriate
movgs gr0,timerh
movgs gr0,timerl
movgs gr0,timerd
movsg hsr0,gr4
sethi.p %hi(HSR0_ETMI),gr5
setlo %lo(HSR0_ETMI),gr5
or gr4,gr5,gr4
movgs gr4,hsr0
LEDS 0x3300
jmpl @(gr27,gr0)
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