| Duy Truong | 790f06d | 2013-02-13 16:38:12 -0800 | [diff] [blame] | 1 | /* Copyright (c) 2010, The Linux Foundation. All rights reserved. |
| Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | /* |
| 15 | mrcmcr.h |
| 16 | |
| 17 | DESCRIPTION: Convenience macros for access the cp registers in the arm. |
| 18 | |
| 19 | REV/DATE: Fri Mar 18 16:34:44 EST 2005 |
| 20 | */ |
| 21 | |
| 22 | #ifndef __mrcmcr__h_ |
| 23 | #define __mrcmcr__h_ |
| 24 | |
| 25 | /* |
| 26 | * Define some convenience macros to acccess the cp registers from c code |
| 27 | * Lots of macro trickery here. |
| 28 | * |
| 29 | * Takes the same format as the asm instructions and unfortunatly you cannot |
| 30 | * use variables to select the crn, crn or op fields... |
| 31 | * |
| 32 | * For those unfamiliar with the # and string stuff. |
| 33 | * # creates a string from the value and any two strings that are beside |
| 34 | * are concatenated...thus these create one big asm string for the |
| 35 | * inline asm code. |
| 36 | * |
| 37 | * When compiled these compile to single asm instructions (fast) but |
| 38 | * without all the hassel of __asm__ __volatile__ (...) =r |
| 39 | * |
| 40 | * Format is: |
| 41 | * |
| 42 | * unsigned long reg; // destination variable |
| 43 | * MRC(reg, p15, 0, c1, c0, 0 ); |
| 44 | * |
| 45 | * MRC read control register |
| 46 | * MCR control register write |
| 47 | */ |
| 48 | |
| 49 | /* |
| 50 | * Some assembly macros so we can use the same macros as in the C version. |
| 51 | * Turns the ASM code a little C-ish but keeps the code consistent and in |
| 52 | * one location... |
| 53 | */ |
| 54 | #ifdef __ASSEMBLY__ |
| 55 | |
| 56 | |
| 57 | #define MRC(reg, processor, op1, crn, crm, op2) \ |
| 58 | (mrc processor , op1 , reg, crn , crm , op2) |
| 59 | |
| 60 | #define MCR(reg, processor, op1, crn, crm, op2) \ |
| 61 | (mcr processor , op1 , reg, crn , crm , op2) |
| 62 | |
| 63 | /* |
| 64 | * C version of the macros. |
| 65 | */ |
| 66 | #else |
| 67 | |
| 68 | #define MRC(reg, processor, op1, crn, crm, op2) \ |
| 69 | __asm__ __volatile__ ( \ |
| 70 | " mrc " #processor "," #op1 ", %0," #crn "," #crm "," #op2 "\n" \ |
| 71 | : "=r" (reg)) |
| 72 | |
| 73 | #define MCR(reg, processor, op1, crn, crm, op2) \ |
| 74 | __asm__ __volatile__ ( \ |
| 75 | " mcr " #processor "," #op1 ", %0," #crn "," #crm "," #op2 "\n" \ |
| 76 | : : "r" (reg)) |
| 77 | #endif |
| 78 | |
| 79 | |
| 80 | /* |
| 81 | * Easy access convenience function to read CP15 registers from c code |
| 82 | */ |
| 83 | #define MRC15(reg, op1, crn, crm, op2) MRC(reg, p15, op1, crn, crm, op2) |
| 84 | #define MCR15(reg, op1, crn, crm, op2) MCR(reg, p15, op1, crn, crm, op2) |
| 85 | |
| 86 | #endif |