| Wang Dongsheng | f8fc7be | 2015-06-04 12:01:08 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 - ARM Ltd |
| 3 | * Author: Marc Zyngier <marc.zyngier@arm.com> |
| 4 | * |
| 5 | * Based on code by Carl van Schaik <carl@ok-labs.com>. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #ifndef _GENERICTIMER_H_ |
| 21 | #define _GENERICTIMER_H_ |
| 22 | |
| 23 | #ifdef __ASSEMBLY__ |
| 24 | |
| 25 | /* |
| 26 | * This macro provide a physical timer that can be used for delay in the code. |
| 27 | * The macro is moved from sunxi/psci_sun7i.S |
| 28 | * |
| 29 | * reg: is used in this macro. |
| 30 | * ticks: The freq is based on generic timer. |
| 31 | */ |
| 32 | .macro timer_wait reg, ticks |
| 33 | movw \reg, #(\ticks & 0xffff) |
| 34 | movt \reg, #(\ticks >> 16) |
| 35 | mcr p15, 0, \reg, c14, c2, 0 |
| 36 | isb |
| 37 | mov \reg, #3 |
| 38 | mcr p15, 0, \reg, c14, c2, 1 |
| 39 | 1 : isb |
| 40 | mrc p15, 0, \reg, c14, c2, 1 |
| 41 | ands \reg, \reg, #4 |
| 42 | bne 1b |
| 43 | mov \reg, #0 |
| 44 | mcr p15, 0, \reg, c14, c2, 1 |
| 45 | isb |
| 46 | .endm |
| 47 | |
| 48 | #endif /* __ASSEMBLY__ */ |
| 49 | |
| 50 | #endif /* _GENERICTIMER_H_ */ |