head-uc-fr401.S
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/* head-uc-fr401.S: FR401/3/5 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/init.h>
#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 /* not on FR401 */
#define __400_DBR3 0xfe000e18 /* not on FR401 */
#define __400_DAM0 0xfe000f00
#define __400_DAM1 0xfe000f08
#define __400_DAM2 0xfe000f10 /* not on FR401 */
#define __400_DAM3 0xfe000f18 /* not on FR401 */
#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 (not FR401/FR401A)
# CC3 - T if DBR3 is present (not FR401/FR401A)
#
###############################################################################
.globl __head_fr401_describe_sdram
__head_fr401_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
# specify which DBR regs are present
setlos #0x00ff,gr4
movgs gr4,cccr
movsg psr,gr3 ; check for FR401/FR401A
srli gr3,#25,gr3
subicc gr3,#0x20>>1,gr0,icc0
bnelr icc0,#1
setlos #0x000f,gr4
movgs gr4,cccr
bralr
###############################################################################
#
# rearrange the bus controller registers
#
# ENTRY: EXIT:
# GR26 &__head_reference [saved]
# GR30 LED address revised LED address
#
###############################################################################
.globl __head_fr401_set_busctl
__head_fr401_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
sethi.p %hi(LED_ADDR - 0x20000000 +__region_CS2),gr30
setlo %lo(LED_ADDR - 0x20000000 +__region_CS2),gr30
bralr
###############################################################################
#
# determine the total SDRAM size
#
# ENTRY: EXIT:
# GR25 - SDRAM size
# GR26 &__head_reference [saved]
# GR30 LED address [saved]
#
###############################################################################
.globl __head_fr401_survey_sdram
__head_fr401_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:
# FR401/FR401A does not have DCS2/3
movsg psr,gr3
srli gr3,#25,gr3
subicc gr3,#0x20>>1,gr0,icc0
beq icc0,#0,__head_no_DCS3
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]
#
###############################################################################
.globl __head_fr401_set_protection
__head_fr401_set_protection:
movsg lr,gr27
# set the I/O region protection registers for FR401/3/5
sethi.p %hi(__region_IO),gr5
setlo %lo(__region_IO),gr5
ori gr5,#xAMPRx_SS_512Mb|xAMPRx_S_KERNEL|xAMPRx_C|xAMPRx_V,gr5
movgs gr0,iampr7
movgs gr5,dampr7 ; General I/O tile
# 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
#ifdef CONFIG_MB93093_PDK
sethi.p %hi(__region_CS2),gr4
setlo %lo(__region_CS2),gr4
ori gr4,#xAMPRx_SS_1Mb|xAMPRx_S_KERNEL|xAMPRx_C|xAMPRx_V,gr4
movgs gr4,dampr6
movgs gr0,iampr6
#else
call __head_split_region
movgs gr4,iampr6
movgs gr5,dampr6
#endif
call __head_split_region
movgs gr4,iampr5
movgs gr5,dampr5
call __head_split_region
movgs gr4,iampr4
movgs gr5,dampr4
call __head_split_region
movgs gr4,iampr3
movgs gr5,dampr3
call __head_split_region
movgs gr4,iampr2
movgs gr5,dampr2
call __head_split_region
movgs gr4,iampr1
movgs gr5,dampr1
# 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 gr5,dampr0
jmpl @(gr27,gr0)