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