148 lines
3.7 KiB
ArmAsm
148 lines
3.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/arch/arm/mm/arm740.S: utility functions for ARM740
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*
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* Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <linux/pgtable.h>
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#include <asm/assembler.h>
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#include <asm/asm-offsets.h>
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#include <asm/hwcap.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/ptrace.h>
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#include "proc-macros.S"
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.text
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/*
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* cpu_arm740_proc_init()
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* cpu_arm740_do_idle()
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* cpu_arm740_dcache_clean_area()
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* cpu_arm740_switch_mm()
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*
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* These are not required.
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*/
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ENTRY(cpu_arm740_proc_init)
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ENTRY(cpu_arm740_do_idle)
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ENTRY(cpu_arm740_dcache_clean_area)
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ENTRY(cpu_arm740_switch_mm)
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ret lr
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/*
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* cpu_arm740_proc_fin()
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*/
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ENTRY(cpu_arm740_proc_fin)
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mrc p15, 0, r0, c1, c0, 0
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bic r0, r0, #0x3f000000 @ bank/f/lock/s
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bic r0, r0, #0x0000000c @ w-buffer/cache
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mcr p15, 0, r0, c1, c0, 0 @ disable caches
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ret lr
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/*
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* cpu_arm740_reset(loc)
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* Params : r0 = address to jump to
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* Notes : This sets up everything for a reset
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*/
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.pushsection .idmap.text, "ax"
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ENTRY(cpu_arm740_reset)
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mov ip, #0
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mcr p15, 0, ip, c7, c0, 0 @ invalidate cache
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mrc p15, 0, ip, c1, c0, 0 @ get ctrl register
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bic ip, ip, #0x0000000c @ ............wc..
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mcr p15, 0, ip, c1, c0, 0 @ ctrl register
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ret r0
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ENDPROC(cpu_arm740_reset)
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.popsection
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.type __arm740_setup, #function
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__arm740_setup:
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mov r0, #0
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mcr p15, 0, r0, c7, c0, 0 @ invalidate caches
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mcr p15, 0, r0, c6, c3 @ disable area 3~7
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mcr p15, 0, r0, c6, c4
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mcr p15, 0, r0, c6, c5
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mcr p15, 0, r0, c6, c6
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mcr p15, 0, r0, c6, c7
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mov r0, #0x0000003F @ base = 0, size = 4GB
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mcr p15, 0, r0, c6, c0 @ set area 0, default
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ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
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ldr r3, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB)
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mov r4, #10 @ 11 is the minimum (4KB)
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1: add r4, r4, #1 @ area size *= 2
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movs r3, r3, lsr #1
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bne 1b @ count not zero r-shift
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orr r0, r0, r4, lsl #1 @ the area register value
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orr r0, r0, #1 @ set enable bit
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mcr p15, 0, r0, c6, c1 @ set area 1, RAM
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ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
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ldr r3, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB)
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cmp r3, #0
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moveq r0, #0
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beq 2f
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mov r4, #10 @ 11 is the minimum (4KB)
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1: add r4, r4, #1 @ area size *= 2
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movs r3, r3, lsr #1
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bne 1b @ count not zero r-shift
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orr r0, r0, r4, lsl #1 @ the area register value
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orr r0, r0, #1 @ set enable bit
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2: mcr p15, 0, r0, c6, c2 @ set area 2, ROM/FLASH
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mov r0, #0x06
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mcr p15, 0, r0, c2, c0 @ Region 1&2 cacheable
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#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
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mov r0, #0x00 @ disable whole write buffer
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#else
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mov r0, #0x02 @ Region 1 write bufferred
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#endif
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mcr p15, 0, r0, c3, c0
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mov r0, #0x10000
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sub r0, r0, #1 @ r0 = 0xffff
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mcr p15, 0, r0, c5, c0 @ all read/write access
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mrc p15, 0, r0, c1, c0 @ get control register
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bic r0, r0, #0x3F000000 @ set to standard caching mode
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@ need some benchmark
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orr r0, r0, #0x0000000d @ MPU/Cache/WB
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ret lr
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.size __arm740_setup, . - __arm740_setup
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__INITDATA
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@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
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define_processor_functions arm740, dabort=v4t_late_abort, pabort=legacy_pabort, nommu=1
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.section ".rodata"
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string cpu_arch_name, "armv4"
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string cpu_elf_name, "v4"
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string cpu_arm740_name, "ARM740T"
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.align
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.section ".proc.info.init", "a"
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.type __arm740_proc_info,#object
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__arm740_proc_info:
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.long 0x41807400
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.long 0xfffffff0
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.long 0
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.long 0
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initfn __arm740_setup, __arm740_proc_info
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.long cpu_arch_name
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.long cpu_elf_name
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.long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_26BIT
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.long cpu_arm740_name
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.long arm740_processor_functions
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.long 0
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.long 0
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.long v4_cache_fns @ cache model
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.size __arm740_proc_info, . - __arm740_proc_info
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