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| /*
| * include/asm-nds32/macro.h
| *
| * Copyright (C) 2009 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
| * Copyright (C) 2011 Andes Technology Corporation
| * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
| *
| * SPDX-License-Identifier: GPL-2.0+
| */
|
| #ifndef __ASM_NDS_MACRO_H
| #define __ASM_NDS_MACRO_H
| #ifdef __ASSEMBLY__
|
| /*
| * These macros provide a convenient way to write 8, 16 and 32 bit data
| * to an "immediate address (address used by periphal)" only.
| * Registers r4 and r5 are used, any data in these registers are
| * overwritten by the macros.
| * The macros are valid for any NDS32 architecture, they do not implement
| * any memory barriers so caution is recommended when using these when the
| * caches are enabled or on a multi-core system.
| */
|
| .macro write32, addr, data
| li $r4, \addr
| li $r5, \data
| swi $r5, [$r4]
| .endm
|
| .macro write16, addr, data
| li $r4, \addr
| li $r5, \data
| shi $r5, [$r4]
| .endm
|
| .macro write8, addr, data
| li $r4, \addr
| li $r5, \data
| sbi $r5, [$r4]
| .endm
|
| /*
| * This macro read a value from a register, then do OR operation
| * (set bit fields) to the value, and then store it back to the register.
| * Note: Instruction 'ori' supports immediate value up to 15 bits.
| */
| .macro setbf32, addr, data
| li $r4, \addr
| lwi $r5, [$r4]
| li $r6, \data
| or $r5, $r5, $r6
| swi $r5, [$r4]
| .endm
|
| .macro setbf15, addr, data
| li $r4, \addr
| lwi $r5, [$r4]
| ori $r5, $r5, \data
| swi $r5, [$r4]
| .endm
|
| /*
| * This macro generates a loop that can be used for delays in the code.
| * Register r4 is used, any data in this register is overwritten by the
| * macro.
| * The macro is valid for any NDS32 architeture. The actual time spent in the
| * loop will vary from CPU to CPU though.
| */
|
| .macro wait_timer, time
| li $r4, \time
| 1:
| nop
| addi $r4, $r4, -1
| bnez $r4, 1b
| .endm
|
| #endif /* __ASSEMBLY__ */
| #endif /* __ASM_ARM_MACRO_H */
|
|
