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https://github.com/AsahiLinux/u-boot
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51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
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/*
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* Copyright (C) 2013 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* Based on code by Carl van Schaik <carl@ok-labs.com>.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _GENERICTIMER_H_
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#define _GENERICTIMER_H_
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#ifdef __ASSEMBLY__
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/*
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* This macro provide a physical timer that can be used for delay in the code.
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* The macro is moved from sunxi/psci_sun7i.S
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*
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* reg: is used in this macro.
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* ticks: The freq is based on generic timer.
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*/
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.macro timer_wait reg, ticks
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movw \reg, #(\ticks & 0xffff)
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movt \reg, #(\ticks >> 16)
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mcr p15, 0, \reg, c14, c2, 0
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isb
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mov \reg, #3
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mcr p15, 0, \reg, c14, c2, 1
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1 : isb
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mrc p15, 0, \reg, c14, c2, 1
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ands \reg, \reg, #4
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bne 1b
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mov \reg, #0
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mcr p15, 0, \reg, c14, c2, 1
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isb
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.endm
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#endif /* __ASSEMBLY__ */
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#endif /* _GENERICTIMER_H_ */
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