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>
20 #include "proc-macros.S"
24 * cpu_arm740_proc_init()
25 * cpu_arm740_do_idle()
26 * cpu_arm740_dcache_clean_area()
27 * cpu_arm740_switch_mm()
29 * These are not required.
31 ENTRY(cpu_arm740_proc_init)
32 ENTRY(cpu_arm740_do_idle)
33 ENTRY(cpu_arm740_dcache_clean_area)
34 ENTRY(cpu_arm740_switch_mm)
38 * cpu_arm740_proc_fin()
40 ENTRY(cpu_arm740_proc_fin)
41 mrc p15, 0, r0, c1, c0, 0
42 bic r0, r0, #0x3f000000 @ bank/f/lock/s
43 bic r0, r0, #0x0000000c @ w-buffer/cache
44 mcr p15, 0, r0, c1, c0, 0 @ disable caches
48 * cpu_arm740_reset(loc)
49 * Params : r0 = address to jump to
50 * Notes : This sets up everything for a reset
52 .pushsection .idmap.text, "ax"
53 ENTRY(cpu_arm740_reset)
55 mcr p15, 0, ip, c7, c0, 0 @ invalidate cache
56 mrc p15, 0, ip, c1, c0, 0 @ get ctrl register
57 bic ip, ip, #0x0000000c @ ............wc..
58 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
60 ENDPROC(cpu_arm740_reset)
63 .type __arm740_setup, #function
66 mcr p15, 0, r0, c7, c0, 0 @ invalidate caches
68 mcr p15, 0, r0, c6, c3 @ disable area 3~7
69 mcr p15, 0, r0, c6, c4
70 mcr p15, 0, r0, c6, c5
71 mcr p15, 0, r0, c6, c6
72 mcr p15, 0, r0, c6, c7
74 mov r0, #0x0000003F @ base = 0, size = 4GB
75 mcr p15, 0, r0, c6, c0 @ set area 0, default
77 ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
78 ldr r3, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB)
79 mov r4, #10 @ 11 is the minimum (4KB)
80 1: add r4, r4, #1 @ area size *= 2
82 bne 1b @ count not zero r-shift
83 orr r0, r0, r4, lsl #1 @ the area register value
84 orr r0, r0, #1 @ set enable bit
85 mcr p15, 0, r0, c6, c1 @ set area 1, RAM
87 ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
88 ldr r3, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB)
92 mov r4, #10 @ 11 is the minimum (4KB)
93 1: add r4, r4, #1 @ area size *= 2
95 bne 1b @ count not zero r-shift
96 orr r0, r0, r4, lsl #1 @ the area register value
97 orr r0, r0, #1 @ set enable bit
98 2: mcr p15, 0, r0, c6, c2 @ set area 2, ROM/FLASH
101 mcr p15, 0, r0, c2, c0 @ Region 1&2 cacheable
102 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
103 mov r0, #0x00 @ disable whole write buffer
105 mov r0, #0x02 @ Region 1 write bufferred
107 mcr p15, 0, r0, c3, c0
110 sub r0, r0, #1 @ r0 = 0xffff
111 mcr p15, 0, r0, c5, c0 @ all read/write access
113 mrc p15, 0, r0, c1, c0 @ get control register
114 bic r0, r0, #0x3F000000 @ set to standard caching mode
115 @ need some benchmark
116 orr r0, r0, #0x0000000d @ MPU/Cache/WB
120 .size __arm740_setup, . - __arm740_setup
124 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
125 define_processor_functions arm740, dabort=v4t_late_abort, pabort=legacy_pabort, nommu=1
129 string cpu_arch_name, "armv4"
130 string cpu_elf_name, "v4"
131 string cpu_arm740_name, "ARM740T"
135 .section ".proc.info.init", #alloc
136 .type __arm740_proc_info,#object
142 initfn __arm740_setup, __arm740_proc_info
145 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_26BIT
146 .long cpu_arm740_name
147 .long arm740_processor_functions
150 .long v4_cache_fns @ cache model
151 .size __arm740_proc_info, . - __arm740_proc_info