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/*
* arch/arm/mach-tegra/power-macros.S
*
* Assembly macros useful for power state save / restore routines
*
* Copyright (c) 2010, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/* returns the ID of the current processor */
.macro cpu_id, rd
mrc p15, 0, \rd, c0, c0, 5
and \rd, \rd, #0xF
.endm
.macro mov32, reg, val
movw \reg, #:lower16:\val
movt \reg, #:upper16:\val
.endm
/* waits until the microsecond counter (base) ticks, for exact timing loops */
.macro wait_for_us, rd, base, tmp
ldr \rd, [\base]
1001: ldr \tmp, [\base]
cmp \rd, \tmp
beq 1001b
mov \rd, \tmp
.endm
/* waits until the microsecond counter (base) is >= rn */
.macro wait_until, rn, base, tmp
1002: ldr \tmp, [\base]
sub \tmp, \tmp, \rn
ands \tmp, \tmp, #0x80000000
dmb
bne 1002b
.endm
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