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Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/ide-2.6
[karo-tx-linux.git] / arch / arm / mm / proc-arm740.S
1 /*
2  *  linux/arch/arm/mm/arm740.S: utility functions for ARM740
3  *
4  *  Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
5  *
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.
9  *
10  */
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>
19
20         .text
21 /*
22  * cpu_arm740_proc_init()
23  * cpu_arm740_do_idle()
24  * cpu_arm740_dcache_clean_area()
25  * cpu_arm740_switch_mm()
26  *
27  * These are not required.
28  */
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)
33         mov     pc, lr
34
35 /*
36  * cpu_arm740_proc_fin()
37  */
38 ENTRY(cpu_arm740_proc_fin)
39         stmfd   sp!, {lr}
40         mov     ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
41         msr     cpsr_c, ip
42         mrc     p15, 0, r0, c1, c0, 0
43         bic     r0, r0, #0x3f000000             @ bank/f/lock/s
44         bic     r0, r0, #0x0000000c             @ w-buffer/cache
45         mcr     p15, 0, r0, c1, c0, 0           @ disable caches
46         mcr     p15, 0, r0, c7, c0, 0           @ invalidate cache
47         ldmfd   sp!, {pc}
48
49 /*
50  * cpu_arm740_reset(loc)
51  * Params  : r0 = address to jump to
52  * Notes   : This sets up everything for a reset
53  */
54 ENTRY(cpu_arm740_reset)
55         mov     ip, #0
56         mcr     p15, 0, ip, c7, c0, 0           @ invalidate cache
57         mrc     p15, 0, ip, c1, c0, 0           @ get ctrl register
58         bic     ip, ip, #0x0000000c             @ ............wc..
59         mcr     p15, 0, ip, c1, c0, 0           @ ctrl register
60         mov     pc, r0
61
62         __INIT
63
64         .type   __arm740_setup, #function
65 __arm740_setup:
66         mov     r0, #0
67         mcr     p15, 0, r0, c7, c0, 0           @ invalidate caches
68
69         mcr     p15, 0, r0, c6, c3              @ disable area 3~7
70         mcr     p15, 0, r0, c6, c4
71         mcr     p15, 0, r0, c6, c5
72         mcr     p15, 0, r0, c6, c6
73         mcr     p15, 0, r0, c6, c7
74
75         mov     r0, #0x0000003F                 @ base = 0, size = 4GB
76         mcr     p15, 0, r0, c6, c0              @ set area 0, default
77
78         ldr     r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
79         ldr     r1, =(CONFIG_DRAM_SIZE >> 12)   @ size of RAM (must be >= 4KB)
80         mov     r2, #10                         @ 11 is the minimum (4KB)
81 1:      add     r2, r2, #1                      @ area size *= 2
82         mov     r1, r1, lsr #1
83         bne     1b                              @ count not zero r-shift
84         orr     r0, r0, r2, lsl #1              @ the area register value
85         orr     r0, r0, #1                      @ set enable bit
86         mcr     p15, 0, r0, c6, c1              @ set area 1, RAM
87
88         ldr     r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
89         ldr     r1, =(CONFIG_FLASH_SIZE >> 12)  @ size of FLASH (must be >= 4KB)
90         mov     r2, #10                         @ 11 is the minimum (4KB)
91 1:      add     r2, r2, #1                      @ area size *= 2
92         mov     r1, r1, lsr #1
93         bne     1b                              @ count not zero r-shift
94         orr     r0, r0, r2, lsl #1              @ the area register value
95         orr     r0, r0, #1                      @ set enable bit
96         mcr     p15, 0, r0, c6, c2              @ set area 2, ROM/FLASH
97
98         mov     r0, #0x06
99         mcr     p15, 0, r0, c2, c0              @ Region 1&2 cacheable
100 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
101         mov     r0, #0x00                       @ disable whole write buffer
102 #else
103         mov     r0, #0x02                       @ Region 1 write bufferred
104 #endif
105         mcr     p15, 0, r0, c3, c0
106
107         mov     r0, #0x10000
108         sub     r0, r0, #1                      @ r0 = 0xffff
109         mcr     p15, 0, r0, c5, c0              @ all read/write access
110
111         mrc     p15, 0, r0, c1, c0              @ get control register
112         bic     r0, r0, #0x3F000000             @ set to standard caching mode
113                                                 @ need some benchmark
114         orr     r0, r0, #0x0000000d             @ MPU/Cache/WB
115
116         mov     pc, lr
117
118         .size   __arm740_setup, . - __arm740_setup
119
120         __INITDATA
121
122 /*
123  * Purpose : Function pointers used to access above functions - all calls
124  *           come through these
125  */
126         .type   arm740_processor_functions, #object
127 ENTRY(arm740_processor_functions)
128         .word   v4t_late_abort
129         .word   legacy_pabort
130         .word   cpu_arm740_proc_init
131         .word   cpu_arm740_proc_fin
132         .word   cpu_arm740_reset
133         .word   cpu_arm740_do_idle
134         .word   cpu_arm740_dcache_clean_area
135         .word   cpu_arm740_switch_mm
136         .word   0                       @ cpu_*_set_pte
137         .size   arm740_processor_functions, . - arm740_processor_functions
138
139         .section ".rodata"
140
141         .type   cpu_arch_name, #object
142 cpu_arch_name:
143         .asciz  "armv4"
144         .size   cpu_arch_name, . - cpu_arch_name
145
146         .type   cpu_elf_name, #object
147 cpu_elf_name:
148         .asciz  "v4"
149         .size   cpu_elf_name, . - cpu_elf_name
150
151         .type   cpu_arm740_name, #object
152 cpu_arm740_name:
153         .ascii  "ARM740T"
154         .size   cpu_arm740_name, . - cpu_arm740_name
155
156         .align
157
158         .section ".proc.info.init", #alloc, #execinstr
159         .type   __arm740_proc_info,#object
160 __arm740_proc_info:
161         .long   0x41807400
162         .long   0xfffffff0
163         .long   0
164         b       __arm740_setup
165         .long   cpu_arch_name
166         .long   cpu_elf_name
167         .long   HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT
168         .long   cpu_arm740_name
169         .long   arm740_processor_functions
170         .long   0
171         .long   0
172         .long   v3_cache_fns                    @ cache model
173         .size   __arm740_proc_info, . - __arm740_proc_info
174
175