/* head-mmu-fr451.S: FR451 mmu-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/init.h>
#include <linux/threads.h>
#include <linux/linkage.h>
#include <asm/ptrace.h>
#include <asm/page.h>
#include <asm/mem-layout.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
__INIT
.balign 4
###############################################################################
#
# describe the position and layout of the SDRAM controller registers
#
# ENTRY: EXIT:
# GR5 - cacheline size
# GR11 - displacement of 2nd SDRAM addr reg from GR14
# GR12 - displacement of 3rd SDRAM addr reg from GR14
# GR13 - displacement of 4th SDRAM addr reg from GR14
# GR14 - address of 1st SDRAM addr reg
# GR15 - amount to shift address by to match SDRAM addr reg
# GR26 &__head_reference [saved]
# GR30 LED address [saved]
# CC0 - T if DBR0 is present
# CC1 - T if DBR1 is present
# CC2 - T if DBR2 is present
# CC3 - T if DBR3 is present
#
###############################################################################
.globl __head_fr451_describe_sdram
__head_fr451_describe_sdram:
sethi.p %hi(__400_DBR0),gr14
setlo %lo(__400_DBR0),gr14
setlos.p #__400_DBR1-__400_DBR0,gr11
setlos #__400_DBR2-__400_DBR0,gr12
setlos.p #__400_DBR3-__400_DBR0,gr13
setlos #32,gr5 ; cacheline size
setlos.p #0,gr15 ; amount to shift addr reg by
setlos #0x00ff,gr4
movgs gr4,cccr ; extant DARS/DAMK regs
bralr
###############################################################################
#
# rearrange the bus controller registers
#
# ENTRY: EXIT:
# GR26 &__head_reference [saved]
# GR30 LED address revised LED address
#
###############################################################################
.globl __head_fr451_set_busctl
__head_fr451_set_busctl:
sethi.p %hi(__400_LGCR),gr4
setlo %lo(__400_LGCR),gr4
sethi.p %hi(__400_LSBR),gr10
setlo %lo(__400_LSBR),gr10
sethi.p %hi(__400_LCR),gr11
setlo %lo(__400_LCR),gr11
# set the bus controller
ldi @(gr4,#0),gr5
ori gr5,#0xff,gr5 ; make sure all chip-selects are enabled
sti gr5,@(gr4,#0)
sethi.p %hi(__region_CS1),gr4
setlo %lo(__region_CS1),gr4
sethi.p %hi(__region_CS1_M),gr5
setlo %lo(__region_CS1_M),gr5
sethi.p %hi(__region_CS1_C),gr6
setlo %lo(__region_CS1_C),gr6
sti gr4,@(gr10,#1*0x08)
sti gr5,@(gr10,#1*0x08+0x100)
sti gr6,@(gr11,#1*0x08)
sethi.p %hi(__region_CS2),gr4
setlo %lo(__region_CS2),gr4
sethi.p %hi(__region_CS2_M),gr5
setlo %lo(__region_CS2_M),gr5
sethi.p %hi(__region_CS2_C),gr6
setlo %lo(__region_CS2_C),gr6
sti gr4,@(gr10,#2*0x08)
sti gr5,@(gr10,#2*0x08+0x100)
sti gr6,@(gr11,#2*0x08)
sethi.p %hi(__region_CS3),gr4
setlo %lo(__region_CS3),gr4
sethi.p %hi(__region_CS3_M),gr5
setlo %lo(__region_CS3_M),gr5
sethi.p %hi(__region_CS3_C),gr6
setlo %lo(__region_CS3_C),gr6
sti gr4,@(gr10,#3*0x08)
sti gr5,@(gr10,#3*0x08+0x100)
sti gr6,@(gr11,#3*0x08)
sethi.p %hi(__region_CS4),gr4
setlo %lo(__region_CS4),gr4
sethi.p %hi(__region_CS4_M),gr5
setlo %lo(__region_CS4_M),gr5
sethi.p %hi(__region_CS4_C),gr6
setlo %lo(__region_CS4_C),gr6
sti gr4,@(gr10,#4*0x08)
sti gr5,@(gr10,#4*0x08+0x100)
sti gr6,@(gr11,#4*0x08)
sethi.p %hi(__region_CS5),gr4
setlo %lo(__region_CS5),gr4
sethi.p %hi(__region_CS5_M),gr5
setlo %lo(__region_CS5_M),gr5
sethi.p %hi(__region_CS5_C),gr6
setlo %lo(__region_CS5_C),gr6
sti gr4,@(gr10,#5*0x08)
sti gr5,@(gr10,#5*0x08+0x100)
sti gr6,@(gr11,#5*0x08)
sethi.p %hi(__region_CS6),gr4
setlo %lo(__region_CS6),gr4
sethi.p %hi(__region_CS6_M),gr5
setlo %lo(__region_CS6_M),gr5
sethi.p %hi(__region_CS6_C),gr6
setlo %lo(__region_CS6_C),gr6
sti gr4,@(gr10,#6*0x08)
sti gr5,@(gr10,#6*0x08+0x100)
sti gr6,@(gr11,#6*0x08)
sethi.p %hi(__region_CS7),gr4
setlo %lo(__region_CS7),gr4
sethi.p %hi(__region_CS7_M),gr5
setlo %lo(__region_CS7_M),gr5
sethi.p %hi(__region_CS7_C),gr6
setlo %lo(__region_CS7_C),gr6
sti gr4,@(gr10,#7*0x08)
sti gr5,@(gr10,#7*0x08+0x100)
sti gr6,@(gr11,#7*0x08)
membar
bar
# adjust LED bank address
#ifdef CONFIG_MB93091_VDK
sethi.p %hi(__region_CS2 + 0x01200004),gr30
setlo %lo(__region_CS2 + 0x01200004),gr30
#endif
bralr
###############################################################################
#
# determine the total SDRAM size
#
# ENTRY: EXIT:
# GR25 - SDRAM size
# GR26 &__head_reference [saved]
# GR30 LED address [saved]
#
###############################################################################
.globl __head_fr451_survey_sdram
__head_fr451_survey_sdram:
sethi.p %hi(__400_DAM0),gr11
setlo %lo(__400_DAM0),gr11
sethi.p %hi(__400_DBR0),gr12
setlo %lo(__400_DBR0),gr12
sethi.p %hi(0xfe000000),gr17 ; unused SDRAM DBR value
setlo %lo(0xfe000000),gr17
setlos #0,gr25
ldi @(gr12,#0x00),gr4 ; DAR0
subcc gr4,gr17,gr0,icc0
beq icc0,#0,__head_no_DCS0
ldi @(gr11,#0x00),gr6 ; DAM0: bits 31:20 match addr 31:20
add gr25,gr6,gr25
addi gr25,#1,gr25
__head_no_DCS0:
ldi @(gr12,#0x08),gr4 ; DAR1
subcc gr4,gr17,gr0,icc0
beq icc0,#0,__head_no_DCS1
ldi @(gr11,#0x08),gr6 ; DAM1: bits 31:20 match addr 31:20
add gr25,gr6,gr25
addi gr25,#1,gr25
__head_no_DCS1:
ldi @(gr12,#0x10),gr4 ; DAR2
subcc gr4,gr17,gr0,icc0
beq icc0,#0,__head_no_DCS2
ldi @(gr11,#0x10),gr6 ; DAM2: bits 31:20 match addr 31:20
add gr25,gr6,gr25
addi gr25,#1,gr25
__head_no_DCS2:
ldi @(gr12,#0x18),gr4 ; DAR3
subcc gr4,gr17,gr0,icc0
beq icc0,#0,__head_no_DCS3
ldi @(gr11,#0x18),gr6 ; DAM3: bits 31:20 match addr 31:20
add gr25,gr6,gr25
addi gr25,#1,gr25
__head_no_DCS3:
bralr
###############################################################################
#
# set the protection map with the I/DAMPR registers
#
# ENTRY: EXIT:
# GR25 SDRAM size [saved]
# GR26 &__head_reference [saved]
# GR30 LED address [saved]
#
#
# Using this map:
# REGISTERS ADDRESS RANGE VIEW
# =============== ====================== ===============================
# IAMPR0/DAMPR0 0xC0000000-0xCFFFFFFF Cached kernel RAM Window
# DAMPR11 0xE0000000-0xFFFFFFFF Uncached I/O
#
###############################################################################
.globl __head_fr451_set_protection
__head_fr451_set_protection:
movsg lr,gr27
# set the I/O region protection registers for FR451 in MMU mode
#define PGPROT_IO xAMPRx_L|xAMPRx_M|xAMPRx_S_KERNEL|xAMPRx_C|xAMPRx_V
sethi.p %hi(__region_IO),gr5
setlo %lo(__region_IO),gr5
setlos #PGPROT_IO|xAMPRx_SS_512Mb,gr4
or gr4,gr5,gr4
movgs gr5,damlr11 ; General I/O tile
movgs gr4,dampr11
# need to open a window onto at least part of the RAM for the kernel's use
sethi.p %hi(__sdram_base),gr8
setlo %lo(__sdram_base),gr8 ; physical address
sethi.p %hi(__page_offset),gr9
setlo %lo(__page_offset),gr9 ; virtual address
setlos #xAMPRx_L|xAMPRx_M|xAMPRx_SS_256Mb|xAMPRx_S_KERNEL|xAMPRx_V,gr11
or gr8,gr11,gr8
movgs gr9,iamlr0 ; mapped from real address 0
movgs gr8,iampr0 ; cached kernel memory at 0xC0000000
movgs gr9,damlr0
movgs gr8,dampr0
# set a temporary mapping for the kernel running at address 0 until we've turned on the MMU
sethi.p %hi(__sdram_base),gr9
setlo %lo(__sdram_base),gr9 ; virtual address
and.p gr4,gr11,gr4
and gr5,gr11,gr5
or.p gr4,gr11,gr4
or gr5,gr11,gr5
movgs gr9,iamlr1 ; mapped from real address 0
movgs gr8,iampr1 ; cached kernel memory at 0x00000000
movgs gr9,damlr1
movgs gr8,dampr1
# we use DAMR2-10 for kmap_atomic(), cache flush and TLB management
# since the DAMLR regs are not going to change, we can set them now
# also set up IAMLR2 to the same as DAMLR5
sethi.p %hi(KMAP_ATOMIC_PRIMARY_FRAME),gr4
setlo %lo(KMAP_ATOMIC_PRIMARY_FRAME),gr4
sethi.p %hi(PAGE_SIZE),gr5
setlo %lo(PAGE_SIZE),gr5
movgs gr4,damlr2
movgs gr4,iamlr2
add gr4,gr5,gr4
movgs gr4,damlr3
add gr4,gr5,gr4
movgs gr4,damlr4
add gr4,gr5,gr4
movgs gr4,damlr5
add gr4,gr5,gr4
movgs gr4,damlr6
add gr4,gr5,gr4
movgs gr4,damlr7
add gr4,gr5,gr4
movgs gr4,damlr8
add gr4,gr5,gr4
movgs gr4,damlr9
add gr4,gr5,gr4
movgs gr4,damlr10
movgs gr0,dampr2
movgs gr0,dampr4
movgs gr0,dampr5
movgs gr0,dampr6
movgs gr0,dampr7
movgs gr0,dampr8
movgs gr0,dampr9
movgs gr0,dampr10
movgs gr0,iamlr3
movgs gr0,iamlr4
movgs gr0,iamlr5
movgs gr0,iamlr6
movgs gr0,iamlr7
movgs gr0,iampr2
movgs gr0,iampr3
movgs gr0,iampr4
movgs gr0,iampr5
movgs gr0,iampr6
movgs gr0,iampr7
# start in TLB context 0 with the swapper's page tables
movgs gr0,cxnr
sethi.p %hi(swapper_pg_dir),gr4
setlo %lo(swapper_pg_dir),gr4
sethi.p %hi(__page_offset),gr5
setlo %lo(__page_offset),gr5
sub gr4,gr5,gr4
movgs gr4,ttbr
setlos #xAMPRx_L|xAMPRx_M|xAMPRx_SS_16Kb|xAMPRx_S|xAMPRx_C|xAMPRx_V,gr5
or gr4,gr5,gr4
movgs gr4,dampr3
# the FR451 also has an extra trap base register
movsg tbr,gr4
movgs gr4,btbr
LEDS 0x3300
jmpl @(gr27,gr0)
###############################################################################
#
# finish setting up the protection registers
#
###############################################################################
.globl __head_fr451_finalise_protection
__head_fr451_finalise_protection:
# 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
# clear the TLB entry cache
movgs gr0,iamlr1
movgs gr0,iampr1
movgs gr0,damlr1
movgs gr0,dampr1
# clear the PGE cache
sethi.p %hi(__flush_tlb_all),gr4
setlo %lo(__flush_tlb_all),gr4
jmpl @(gr4,gr0)
