| Macpaul Lin | 0b9b59a | 2011-10-11 22:33:15 +0000 | [diff] [blame] | 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 | * |
| 8 | * See file CREDITS for list of people who contributed to this |
| 9 | * project. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License as |
| 13 | * published by the Free Software Foundation; either version 2 of |
| 14 | * the License, or (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 24 | * MA 02111-1307 USA |
| 25 | */ |
| 26 | |
| 27 | #ifndef __ASM_NDS_MACRO_H |
| 28 | #define __ASM_NDS_MACRO_H |
| 29 | #ifdef __ASSEMBLY__ |
| 30 | |
| 31 | /* |
| 32 | * These macros provide a convenient way to write 8, 16 and 32 bit data |
| 33 | * to an "immediate address (address used by periphal)" only. |
| 34 | * Registers r4 and r5 are used, any data in these registers are |
| 35 | * overwritten by the macros. |
| 36 | * The macros are valid for any NDS32 architecture, they do not implement |
| 37 | * any memory barriers so caution is recommended when using these when the |
| 38 | * caches are enabled or on a multi-core system. |
| 39 | */ |
| 40 | |
| 41 | .macro write32, addr, data |
| 42 | li $r4, addr |
| 43 | li $r5, data |
| 44 | swi $r5, [$r4] |
| 45 | .endm |
| 46 | |
| 47 | .macro write16, addr, data |
| 48 | li $r4, addr |
| 49 | li $r5, data |
| 50 | shi $r5, [$r4] |
| 51 | .endm |
| 52 | |
| 53 | .macro write8, addr, data |
| 54 | li $r4, addr |
| 55 | li $r5, data |
| 56 | sbi $r5, [$r4] |
| 57 | .endm |
| 58 | |
| 59 | /* |
| 60 | * This macro read a value from a register, then do OR operation |
| 61 | * (set bit fields) to the value, and then store it back to the register. |
| 62 | * Note: Instruction 'ori' supports immediate value up to 15 bits. |
| 63 | */ |
| 64 | .macro setbf32, addr, data |
| 65 | li $r4, addr |
| 66 | lwi $r5, [$r4] |
| 67 | li $r6, data |
| 68 | or $r5, $r5, $r6 |
| 69 | swi $r5, [$r4] |
| 70 | .endm |
| 71 | |
| 72 | .macro setbf15, addr, data |
| 73 | li $r4, addr |
| 74 | lwi $r5, [$r4] |
| 75 | ori $r5, $r5, data |
| 76 | swi $r5, [$r4] |
| 77 | .endm |
| 78 | |
| 79 | /* |
| 80 | * This macro generates a loop that can be used for delays in the code. |
| 81 | * Register r4 is used, any data in this register is overwritten by the |
| 82 | * macro. |
| 83 | * The macro is valid for any NDS32 architeture. The actual time spent in the |
| 84 | * loop will vary from CPU to CPU though. |
| 85 | */ |
| 86 | |
| 87 | .macro wait_timer, time |
| 88 | li $r4, time |
| 89 | 1: |
| 90 | nop |
| 91 | addi $r4, $r4, -1 |
| 92 | bnez $r4, 1b |
| 93 | .endm |
| 94 | |
| 95 | #endif /* __ASSEMBLY__ */ |
| 96 | #endif /* __ASM_ARM_MACRO_H */ |