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ARM: Realview/Versatile: separate out common sched_clock()
Provide a common sched_clock() implementation for Versatile and Realview. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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commit
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4 changed files with 55 additions and 38 deletions
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@ -53,8 +53,6 @@
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#include "core.h"
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#define REALVIEW_REFCOUNTER (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_24MHz_OFFSET)
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/* used by entry-macro.S and platsmp.c */
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void __iomem *gic_cpu_base_addr;
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@ -77,20 +75,6 @@ void __init realview_adjust_zones(int node, unsigned long *size,
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}
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#endif
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/*
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* This is the RealView sched_clock implementation. This has
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* a resolution of 41.7ns, and a maximum value of about 179s.
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*/
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unsigned long long sched_clock(void)
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{
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unsigned long long v;
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v = (unsigned long long)readl(REALVIEW_REFCOUNTER) * 125;
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do_div(v, 3);
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return v;
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}
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#define REALVIEW_FLASHCTRL (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_FLASH_OFFSET)
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@ -28,7 +28,6 @@
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#include <linux/amba/clcd.h>
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#include <linux/amba/pl061.h>
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#include <linux/amba/mmci.h>
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#include <linux/cnt32_to_63.h>
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#include <linux/io.h>
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#include <asm/clkdev.h>
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@ -227,27 +226,6 @@ void __init versatile_map_io(void)
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iotable_init(versatile_io_desc, ARRAY_SIZE(versatile_io_desc));
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}
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#define VERSATILE_REFCOUNTER (__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_24MHz_OFFSET)
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/*
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* This is the Versatile sched_clock implementation. This has
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* a resolution of 41.7ns, and a maximum value of about 35583 days.
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*
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* The return value is guaranteed to be monotonic in that range as
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* long as there is always less than 89 seconds between successive
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* calls to this function.
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*/
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unsigned long long sched_clock(void)
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{
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unsigned long long v = cnt32_to_63(readl(VERSATILE_REFCOUNTER));
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/* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */
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v *= 125<<1;
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do_div(v, 3<<1);
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return v;
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}
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#define VERSATILE_FLASHCTRL (__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_FLASH_OFFSET)
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@ -1,2 +1,4 @@
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obj-y := clock.o
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obj-$(CONFIG_ARM_TIMER_SP804) += timer-sp.o
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obj-$(CONFIG_ARCH_REALVIEW) += sched-clock.o
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obj-$(CONFIG_ARCH_VERSATILE) += sched-clock.o
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53
arch/arm/plat-versatile/sched-clock.c
Normal file
53
arch/arm/plat-versatile/sched-clock.c
Normal file
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@ -0,0 +1,53 @@
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/*
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* linux/arch/arm/plat-versatile/sched-clock.c
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*
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* Copyright (C) 1999 - 2003 ARM Limited
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* Copyright (C) 2000 Deep Blue Solutions Ltd
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/cnt32_to_63.h>
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#include <linux/io.h>
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#include <asm/div64.h>
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#include <mach/hardware.h>
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#include <mach/platform.h>
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#ifdef VERSATILE_SYS_BASE
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#define REFCOUNTER (__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_24MHz_OFFSET)
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#endif
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#ifdef REALVIEW_SYS_BASE
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#define REFCOUNTER (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_24MHz_OFFSET)
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#endif
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/*
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* This is the Realview and Versatile sched_clock implementation. This
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* has a resolution of 41.7ns, and a maximum value of about 35583 days.
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*
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* The return value is guaranteed to be monotonic in that range as
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* long as there is always less than 89 seconds between successive
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* calls to this function.
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*/
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unsigned long long sched_clock(void)
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{
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unsigned long long v = cnt32_to_63(readl(REFCOUNTER));
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/* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */
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v *= 125<<1;
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do_div(v, 3<<1);
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return v;
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}
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