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1 | /* |
2 | * include/asm-nds32/macro.h | |
3 | * | |
4 | * Copyright (C) 2009 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | |
5 | * Copyright (C) 2011 Andes Technology Corporation | |
6 | * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com> | |
7 | * | |
1a459660 | 8 | * SPDX-License-Identifier: GPL-2.0+ |
00f892fc ML |
9 | */ |
10 | ||
11 | #ifndef __ASM_NDS_MACRO_H | |
12 | #define __ASM_NDS_MACRO_H | |
13 | #ifdef __ASSEMBLY__ | |
14 | ||
15 | /* | |
16 | * These macros provide a convenient way to write 8, 16 and 32 bit data | |
17 | * to an "immediate address (address used by periphal)" only. | |
18 | * Registers r4 and r5 are used, any data in these registers are | |
19 | * overwritten by the macros. | |
20 | * The macros are valid for any NDS32 architecture, they do not implement | |
21 | * any memory barriers so caution is recommended when using these when the | |
22 | * caches are enabled or on a multi-core system. | |
23 | */ | |
24 | ||
25 | .macro write32, addr, data | |
26 | li $r4, addr | |
27 | li $r5, data | |
28 | swi $r5, [$r4] | |
29 | .endm | |
30 | ||
31 | .macro write16, addr, data | |
32 | li $r4, addr | |
33 | li $r5, data | |
34 | shi $r5, [$r4] | |
35 | .endm | |
36 | ||
37 | .macro write8, addr, data | |
38 | li $r4, addr | |
39 | li $r5, data | |
40 | sbi $r5, [$r4] | |
41 | .endm | |
42 | ||
43 | /* | |
44 | * This macro read a value from a register, then do OR operation | |
45 | * (set bit fields) to the value, and then store it back to the register. | |
46 | * Note: Instruction 'ori' supports immediate value up to 15 bits. | |
47 | */ | |
48 | .macro setbf32, addr, data | |
49 | li $r4, addr | |
50 | lwi $r5, [$r4] | |
51 | li $r6, data | |
52 | or $r5, $r5, $r6 | |
53 | swi $r5, [$r4] | |
54 | .endm | |
55 | ||
56 | .macro setbf15, addr, data | |
57 | li $r4, addr | |
58 | lwi $r5, [$r4] | |
59 | ori $r5, $r5, data | |
60 | swi $r5, [$r4] | |
61 | .endm | |
62 | ||
63 | /* | |
64 | * This macro generates a loop that can be used for delays in the code. | |
65 | * Register r4 is used, any data in this register is overwritten by the | |
66 | * macro. | |
67 | * The macro is valid for any NDS32 architeture. The actual time spent in the | |
68 | * loop will vary from CPU to CPU though. | |
69 | */ | |
70 | ||
71 | .macro wait_timer, time | |
72 | li $r4, time | |
73 | 1: | |
74 | nop | |
75 | addi $r4, $r4, -1 | |
76 | bnez $r4, 1b | |
77 | .endm | |
78 | ||
79 | #endif /* __ASSEMBLY__ */ | |
80 | #endif /* __ASM_ARM_MACRO_H */ |