/* head-uc-fr555.S: FR555 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 __551_DARS0 0xfeff0100
#define __551_DARS1 0xfeff0104
#define __551_DARS2 0xfeff0108
#define __551_DARS3 0xfeff010c
#define __551_DAMK0 0xfeff0110
#define __551_DAMK1 0xfeff0114
#define __551_DAMK2 0xfeff0118
#define __551_DAMK3 0xfeff011c
#define __551_LCR 0xfeff1100
#define __551_LSBR 0xfeff1c00
.section .text.init,"ax"
.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 DARS0 is present
# CC1 - T if DARS1 is present
# CC2 - T if DARS2 is present
# CC3 - T if DARS3 is present
#
###############################################################################
.globl __head_fr555_describe_sdram
__head_fr555_describe_sdram:
sethi.p %hi(__551_DARS0),gr14
setlo %lo(__551_DARS0),gr14
setlos.p #__551_DARS1-__551_DARS0,gr11
setlos #__551_DARS2-__551_DARS0,gr12
setlos.p #__551_DARS3-__551_DARS0,gr13
setlos #64,gr5 ; cacheline size
setlos #20,gr15 ; amount to shift addr 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_fr555_set_busctl
__head_fr555_set_busctl:
LEDS 0x100f
sethi.p %hi(__551_LSBR),gr10
setlo %lo(__551_LSBR),gr10
sethi.p %hi(__551_LCR),gr11
setlo %lo(__551_LCR),gr11
# set the bus controller
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(LED_ADDR - 0x20000000 +__region_CS2),gr30
setlo %lo(LED_ADDR - 0x20000000 +__region_CS2),gr30
#endif
bralr
###############################################################################
#
# determine the total SDRAM size
#
# ENTRY: EXIT:
# GR25 - SDRAM size
# GR26 &__head_reference [saved]
# GR30 LED address [saved]
#
###############################################################################
.globl __head_fr555_survey_sdram
__head_fr555_survey_sdram:
sethi.p %hi(__551_DAMK0),gr11
setlo %lo(__551_DAMK0),gr11
sethi.p %hi(__551_DARS0),gr12
setlo %lo(__551_DARS0),gr12
sethi.p %hi(0xfff),gr17 ; unused SDRAM AMK value
setlo %lo(0xfff),gr17
setlos #0,gr25
ldi @(gr11,#0x00),gr6 ; DAMK0: bits 11:0 match addr 11:0
subcc gr6,gr17,gr0,icc0
beq icc0,#0,__head_no_DCS0
ldi @(gr12,#0x00),gr4 ; DARS0
add gr25,gr6,gr25
addi gr25,#1,gr25
__head_no_DCS0:
ldi @(gr11,#0x04),gr6 ; DAMK1: bits 11:0 match addr 11:0
subcc gr6,gr17,gr0,icc0
beq icc0,#0,__head_no_DCS1
ldi @(gr12,#0x04),gr4 ; DARS1
add gr25,gr6,gr25
addi gr25,#1,gr25
__head_no_DCS1:
ldi @(gr11,#0x8),gr6 ; DAMK2: bits 11:0 match addr 11:0
subcc gr6,gr17,gr0,icc0
beq icc0,#0,__head_no_DCS2
ldi @(gr12,#0x8),gr4 ; DARS2
add gr25,gr6,gr25
addi gr25,#1,gr25
__head_no_DCS2:
ldi @(gr11,#0xc),gr6 ; DAMK3: bits 11:0 match addr 11:0
subcc gr6,gr17,gr0,icc0
beq icc0,#0,__head_no_DCS3
ldi @(gr12,#0xc),gr4 ; DARS3
add gr25,gr6,gr25
addi gr25,#1,gr25
__head_no_DCS3:
slli gr25,#20,gr25 ; shift [11:0] -> [31:20]
bralr
###############################################################################
#
# set the protection map with the I/DAMPR registers
#
# ENTRY: EXIT:
# GR25 SDRAM size saved
# GR30 LED address saved
#
###############################################################################
.globl __head_fr555_set_protection
__head_fr555_set_protection:
movsg lr,gr27
sethi.p %hi(0xfff00000),gr11
setlo %lo(0xfff00000),gr11
# set the I/O region protection registers for FR555
sethi.p %hi(__region_IO),gr7
setlo %lo(__region_IO),gr7
ori gr7,#xAMPRx_SS_512Mb|xAMPRx_S_KERNEL|xAMPRx_C|xAMPRx_V,gr5
movgs gr0,iampr15
movgs gr0,iamlr15
movgs gr5,dampr15
movgs gr7,damlr15
# 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
# GR8 = base of uncovered RAM
# GR9 = top of uncovered RAM
# GR11 - mask for DAMLR/IAMLR regs
#
call __head_split_region
movgs gr4,iampr14
movgs gr6,iamlr14
movgs gr5,dampr14
movgs gr7,damlr14
call __head_split_region
movgs gr4,iampr13
movgs gr6,iamlr13
movgs gr5,dampr13
movgs gr7,damlr13
call __head_split_region
movgs gr4,iampr12
movgs gr6,iamlr12
movgs gr5,dampr12
movgs gr7,damlr12
call __head_split_region
movgs gr4,iampr11
movgs gr6,iamlr11
movgs gr5,dampr11
movgs gr7,damlr11
call __head_split_region
movgs gr4,iampr10
movgs gr6,iamlr10
movgs gr5,dampr10
movgs gr7,damlr10
call __head_split_region
movgs gr4,iampr9
movgs gr6,iamlr9
movgs gr5,dampr9
movgs gr7,damlr9
call __head_split_region
movgs gr4,iampr8
movgs gr6,iamlr8
movgs gr5,dampr8
movgs gr7,damlr8
call __head_split_region
movgs gr4,iampr7
movgs gr6,iamlr7
movgs gr5,dampr7
movgs gr7,damlr7
call __head_split_region
movgs gr4,iampr6
movgs gr6,iamlr6
movgs gr5,dampr6
movgs gr7,damlr6
call __head_split_region
movgs gr4,iampr5
movgs gr6,iamlr5
movgs gr5,dampr5
movgs gr7,damlr5
call __head_split_region
movgs gr4,iampr4
movgs gr6,iamlr4
movgs gr5,dampr4
movgs gr7,damlr4
call __head_split_region
movgs gr4,iampr3
movgs gr6,iamlr3
movgs gr5,dampr3
movgs gr7,damlr3
call __head_split_region
movgs gr4,iampr2
movgs gr6,iamlr2
movgs gr5,dampr2
movgs gr7,damlr2
call __head_split_region
movgs gr4,iampr1
movgs gr6,iamlr1
movgs gr5,dampr1
movgs gr7,damlr1
# cover kernel core image with kernel-only segment
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
jmpl @(gr27,gr0)
