diff options
Diffstat (limited to 'arch/frv/kernel/head-mmu-fr451.S')
| -rw-r--r-- | arch/frv/kernel/head-mmu-fr451.S | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/arch/frv/kernel/head-mmu-fr451.S b/arch/frv/kernel/head-mmu-fr451.S new file mode 100644 index 0000000..a143c2f --- /dev/null +++ b/arch/frv/kernel/head-mmu-fr451.S @@ -0,0 +1,374 @@ +/* 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/config.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 + + .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 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) |
