1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * linux/arch/arm/mm/arm740.S: utility functi
4 *
5 * Copyright (C) 2004-2006 Hyok S. Choi (hyok
6 */
7 #include <linux/linkage.h>
8 #include <linux/init.h>
9 #include <linux/cfi_types.h>
10 #include <linux/pgtable.h>
11 #include <asm/assembler.h>
12 #include <asm/asm-offsets.h>
13 #include <asm/hwcap.h>
14 #include <asm/pgtable-hwdef.h>
15 #include <asm/ptrace.h>
16
17 #include "proc-macros.S"
18
19 .text
20 /*
21 * cpu_arm740_proc_init()
22 * cpu_arm740_do_idle()
23 * cpu_arm740_dcache_clean_area()
24 * cpu_arm740_switch_mm()
25 *
26 * These are not required.
27 */
28 SYM_TYPED_FUNC_START(cpu_arm740_proc_init)
29 ret lr
30 SYM_FUNC_END(cpu_arm740_proc_init)
31
32 SYM_TYPED_FUNC_START(cpu_arm740_do_idle)
33 ret lr
34 SYM_FUNC_END(cpu_arm740_do_idle)
35
36 SYM_TYPED_FUNC_START(cpu_arm740_dcache_clean_a
37 ret lr
38 SYM_FUNC_END(cpu_arm740_dcache_clean_area)
39
40 SYM_TYPED_FUNC_START(cpu_arm740_switch_mm)
41 ret lr
42 SYM_FUNC_END(cpu_arm740_switch_mm)
43
44 /*
45 * cpu_arm740_proc_fin()
46 */
47 SYM_TYPED_FUNC_START(cpu_arm740_proc_fin)
48 mrc p15, 0, r0, c1, c0, 0
49 bic r0, r0, #0x3f000000
50 bic r0, r0, #0x0000000c
51 mcr p15, 0, r0, c1, c0, 0
52 ret lr
53 SYM_FUNC_END(cpu_arm740_proc_fin)
54
55 /*
56 * cpu_arm740_reset(loc)
57 * Params : r0 = address to jump to
58 * Notes : This sets up everything for a res
59 */
60 .pushsection .idmap.text, "ax"
61 SYM_TYPED_FUNC_START(cpu_arm740_reset)
62 mov ip, #0
63 mcr p15, 0, ip, c7, c0, 0
64 mrc p15, 0, ip, c1, c0, 0
65 bic ip, ip, #0x0000000c
66 mcr p15, 0, ip, c1, c0, 0
67 ret r0
68 SYM_FUNC_END(cpu_arm740_reset)
69 .popsection
70
71 .type __arm740_setup, #function
72 __arm740_setup:
73 mov r0, #0
74 mcr p15, 0, r0, c7, c0, 0
75
76 mcr p15, 0, r0, c6, c3
77 mcr p15, 0, r0, c6, c4
78 mcr p15, 0, r0, c6, c5
79 mcr p15, 0, r0, c6, c6
80 mcr p15, 0, r0, c6, c7
81
82 mov r0, #0x0000003F
83 mcr p15, 0, r0, c6, c0
84
85 ldr r0, =(CONFIG_DRAM_BASE & 0xFFF
86 ldr r3, =(CONFIG_DRAM_SIZE >> 12)
87 mov r4, #10
88 1: add r4, r4, #1
89 movs r3, r3, lsr #1
90 bne 1b
91 orr r0, r0, r4, lsl #1
92 orr r0, r0, #1
93 mcr p15, 0, r0, c6, c1
94
95 ldr r0, =(CONFIG_FLASH_MEM_BASE &
96 ldr r3, =(CONFIG_FLASH_SIZE >> 12)
97 cmp r3, #0
98 moveq r0, #0
99 beq 2f
100 mov r4, #10
101 1: add r4, r4, #1
102 movs r3, r3, lsr #1
103 bne 1b
104 orr r0, r0, r4, lsl #1
105 orr r0, r0, #1
106 2: mcr p15, 0, r0, c6, c2
107
108 mov r0, #0x06
109 mcr p15, 0, r0, c2, c0
110 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
111 mov r0, #0x00
112 #else
113 mov r0, #0x02
114 #endif
115 mcr p15, 0, r0, c3, c0
116
117 mov r0, #0x10000
118 sub r0, r0, #1
119 mcr p15, 0, r0, c5, c0
120
121 mrc p15, 0, r0, c1, c0
122 bic r0, r0, #0x3F000000
123
124 orr r0, r0, #0x0000000d
125
126 ret lr
127
128 .size __arm740_setup, . - __arm740_s
129
130 __INITDATA
131
132 @ define struct processor (see <asm/pr
133 define_processor_functions arm740, dab
134
135 .section ".rodata"
136
137 string cpu_arch_name, "armv4"
138 string cpu_elf_name, "v4"
139 string cpu_arm740_name, "ARM740T"
140
141 .align
142
143 .section ".proc.info.init", "a"
144 .type __arm740_proc_info,#object
145 __arm740_proc_info:
146 .long 0x41807400
147 .long 0xfffffff0
148 .long 0
149 .long 0
150 initfn __arm740_setup, __arm740_proc_
151 .long cpu_arch_name
152 .long cpu_elf_name
153 .long HWCAP_SWP | HWCAP_HALF | HWCAP
154 .long cpu_arm740_name
155 .long arm740_processor_functions
156 .long 0
157 .long 0
158 .long v4_cache_fns
159 .size __arm740_proc_info, . - __arm7
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