| /* 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) |
