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| author | Wang Dongsheng <dongsheng.wang@freescale.com> | 2015-06-04 12:01:08 +0800 |
|---|---|---|
| committer | York Sun <yorksun@freescale.com> | 2015-07-20 11:44:38 -0700 |
| commit | 972af2ab515fe0d0a39271966c9c6df0d9349f37 (patch) | |
| tree | 13b521e3e6303f298d0d9f498364dcd380e44986 /arch/arm/include/asm/arch-armv7/generictimer.h | |
| parent | 49a5e42a780dadf69fcac177143b0c8619ec467b (diff) | |
| download | talos-obmc-uboot-972af2ab515fe0d0a39271966c9c6df0d9349f37.tar.gz talos-obmc-uboot-972af2ab515fe0d0a39271966c9c6df0d9349f37.zip | |
ARMv7: Factor out reusable timer_wait from sunxi/psci_sun7i.S
timer_wait is moved from sunxi/psci_sun7i.S, and it can be converted
completely into a reusable armv7 generic timer. LS1021A will use it
as well.
Signed-off-by: Wang Dongsheng <dongsheng.wang@freescale.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'arch/arm/include/asm/arch-armv7/generictimer.h')
| -rw-r--r-- | arch/arm/include/asm/arch-armv7/generictimer.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-armv7/generictimer.h b/arch/arm/include/asm/arch-armv7/generictimer.h new file mode 100644 index 0000000000..f402686092 --- /dev/null +++ b/arch/arm/include/asm/arch-armv7/generictimer.h @@ -0,0 +1,50 @@ +/* + * Copyright (C) 2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Based on code by Carl van Schaik <carl@ok-labs.com>. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef _GENERICTIMER_H_ +#define _GENERICTIMER_H_ + +#ifdef __ASSEMBLY__ + +/* + * This macro provide a physical timer that can be used for delay in the code. + * The macro is moved from sunxi/psci_sun7i.S + * + * reg: is used in this macro. + * ticks: The freq is based on generic timer. + */ +.macro timer_wait reg, ticks + movw \reg, #(\ticks & 0xffff) + movt \reg, #(\ticks >> 16) + mcr p15, 0, \reg, c14, c2, 0 + isb + mov \reg, #3 + mcr p15, 0, \reg, c14, c2, 1 +1 : isb + mrc p15, 0, \reg, c14, c2, 1 + ands \reg, \reg, #4 + bne 1b + mov \reg, #0 + mcr p15, 0, \reg, c14, c2, 1 + isb +.endm + +#endif /* __ASSEMBLY__ */ + +#endif /* _GENERICTIMER_H_ */ |
