2 * linux/arch/arm/mm/arm740.S: utility functions for ARM740
4 * Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/linkage.h>
12 #include <linux/init.h>
13 #include <asm/assembler.h>
14 #include <asm/asm-offsets.h>
15 #include <asm/hwcap.h>
16 #include <asm/pgtable-hwdef.h>
17 #include <asm/pgtable.h>
18 #include <asm/ptrace.h>
22 * cpu_arm740_proc_init()
23 * cpu_arm740_do_idle()
24 * cpu_arm740_dcache_clean_area()
25 * cpu_arm740_switch_mm()
27 * These are not required.
29 ENTRY(cpu_arm740_proc_init)
30 ENTRY(cpu_arm740_do_idle)
31 ENTRY(cpu_arm740_dcache_clean_area)
32 ENTRY(cpu_arm740_switch_mm)
36 * cpu_arm740_proc_fin()
38 ENTRY(cpu_arm740_proc_fin)
39 mrc p15, 0, r0, c1, c0, 0
40 bic r0, r0, #0x3f000000 @ bank/f/lock/s
41 bic r0, r0, #0x0000000c @ w-buffer/cache
42 mcr p15, 0, r0, c1, c0, 0 @ disable caches
46 * cpu_arm740_reset(loc)
47 * Params : r0 = address to jump to
48 * Notes : This sets up everything for a reset
50 ENTRY(cpu_arm740_reset)
52 mcr p15, 0, ip, c7, c0, 0 @ invalidate cache
53 mrc p15, 0, ip, c1, c0, 0 @ get ctrl register
54 bic ip, ip, #0x0000000c @ ............wc..
55 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
60 .type __arm740_setup, #function
63 mcr p15, 0, r0, c7, c0, 0 @ invalidate caches
65 mcr p15, 0, r0, c6, c3 @ disable area 3~7
66 mcr p15, 0, r0, c6, c4
67 mcr p15, 0, r0, c6, c5
68 mcr p15, 0, r0, c6, c6
69 mcr p15, 0, r0, c6, c7
71 mov r0, #0x0000003F @ base = 0, size = 4GB
72 mcr p15, 0, r0, c6, c0 @ set area 0, default
74 ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
75 ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB)
76 mov r2, #10 @ 11 is the minimum (4KB)
77 1: add r2, r2, #1 @ area size *= 2
79 bne 1b @ count not zero r-shift
80 orr r0, r0, r2, lsl #1 @ the area register value
81 orr r0, r0, #1 @ set enable bit
82 mcr p15, 0, r0, c6, c1 @ set area 1, RAM
84 ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
85 ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB)
86 mov r2, #10 @ 11 is the minimum (4KB)
87 1: add r2, r2, #1 @ area size *= 2
89 bne 1b @ count not zero r-shift
90 orr r0, r0, r2, lsl #1 @ the area register value
91 orr r0, r0, #1 @ set enable bit
92 mcr p15, 0, r0, c6, c2 @ set area 2, ROM/FLASH
95 mcr p15, 0, r0, c2, c0 @ Region 1&2 cacheable
96 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
97 mov r0, #0x00 @ disable whole write buffer
99 mov r0, #0x02 @ Region 1 write bufferred
101 mcr p15, 0, r0, c3, c0
104 sub r0, r0, #1 @ r0 = 0xffff
105 mcr p15, 0, r0, c5, c0 @ all read/write access
107 mrc p15, 0, r0, c1, c0 @ get control register
108 bic r0, r0, #0x3F000000 @ set to standard caching mode
109 @ need some benchmark
110 orr r0, r0, #0x0000000d @ MPU/Cache/WB
114 .size __arm740_setup, . - __arm740_setup
119 * Purpose : Function pointers used to access above functions - all calls
122 .type arm740_processor_functions, #object
123 ENTRY(arm740_processor_functions)
126 .word cpu_arm740_proc_init
127 .word cpu_arm740_proc_fin
128 .word cpu_arm740_reset
129 .word cpu_arm740_do_idle
130 .word cpu_arm740_dcache_clean_area
131 .word cpu_arm740_switch_mm
132 .word 0 @ cpu_*_set_pte
136 .size arm740_processor_functions, . - arm740_processor_functions
140 .type cpu_arch_name, #object
143 .size cpu_arch_name, . - cpu_arch_name
145 .type cpu_elf_name, #object
148 .size cpu_elf_name, . - cpu_elf_name
150 .type cpu_arm740_name, #object
153 .size cpu_arm740_name, . - cpu_arm740_name
157 .section ".proc.info.init", #alloc, #execinstr
158 .type __arm740_proc_info,#object
166 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT
167 .long cpu_arm740_name
168 .long arm740_processor_functions
171 .long v3_cache_fns @ cache model
172 .size __arm740_proc_info, . - __arm740_proc_info