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Macpaul Lin00f892f2011-10-11 22:33:15 +00001/*
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 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02008 * SPDX-License-Identifier: GPL-2.0+
Macpaul Lin00f892f2011-10-11 22:33:15 +00009 */
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
731:
74 nop
75 addi $r4, $r4, -1
76 bnez $r4, 1b
77.endm
78
79#endif /* __ASSEMBLY__ */
80#endif /* __ASM_ARM_MACRO_H */