diff options
Diffstat (limited to 'arch/frv/kernel/head-uc-fr555.S')
| -rw-r--r-- | arch/frv/kernel/head-uc-fr555.S | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/arch/frv/kernel/head-uc-fr555.S b/arch/frv/kernel/head-uc-fr555.S new file mode 100644 index 0000000..d088db2 --- /dev/null +++ b/arch/frv/kernel/head-uc-fr555.S @@ -0,0 +1,347 @@ +/* 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/config.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 __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) |
