From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/arm/mach-rpc/time.c | 92 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 kernel/arch/arm/mach-rpc/time.c (limited to 'kernel/arch/arm/mach-rpc/time.c') diff --git a/kernel/arch/arm/mach-rpc/time.c b/kernel/arch/arm/mach-rpc/time.c new file mode 100644 index 000000000..2689771c1 --- /dev/null +++ b/kernel/arch/arm/mach-rpc/time.c @@ -0,0 +1,92 @@ +/* + * linux/arch/arm/common/time-acorn.c + * + * Copyright (c) 1996-2000 Russell King. + * + * 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. + * + * Changelog: + * 24-Sep-1996 RMK Created + * 10-Oct-1996 RMK Brought up to date with arch-sa110eval + * 04-Dec-1997 RMK Updated for new arch/arm/time.c + * 13=Jun-2004 DS Moved to arch/arm/common b/c shared w/CLPS7500 + */ +#include +#include +#include +#include +#include + +#include +#include + +#include + +#define RPC_CLOCK_FREQ 2000000 +#define RPC_LATCH DIV_ROUND_CLOSEST(RPC_CLOCK_FREQ, HZ) + +static u32 ioc_timer_gettimeoffset(void) +{ + unsigned int count1, count2, status; + long offset; + + ioc_writeb (0, IOC_T0LATCH); + barrier (); + count1 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8); + barrier (); + status = ioc_readb(IOC_IRQREQA); + barrier (); + ioc_writeb (0, IOC_T0LATCH); + barrier (); + count2 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8); + + offset = count2; + if (count2 < count1) { + /* + * We have not had an interrupt between reading count1 + * and count2. + */ + if (status & (1 << 5)) + offset -= RPC_LATCH; + } else if (count2 > count1) { + /* + * We have just had another interrupt between reading + * count1 and count2. + */ + offset -= RPC_LATCH; + } + + offset = (RPC_LATCH - offset) * (tick_nsec / 1000); + return DIV_ROUND_CLOSEST(offset, RPC_LATCH) * 1000; +} + +void __init ioctime_init(void) +{ + ioc_writeb(RPC_LATCH & 255, IOC_T0LTCHL); + ioc_writeb(RPC_LATCH >> 8, IOC_T0LTCHH); + ioc_writeb(0, IOC_T0GO); +} + +static irqreturn_t +ioc_timer_interrupt(int irq, void *dev_id) +{ + timer_tick(); + return IRQ_HANDLED; +} + +static struct irqaction ioc_timer_irq = { + .name = "timer", + .handler = ioc_timer_interrupt +}; + +/* + * Set up timer interrupt. + */ +void __init ioc_timer_init(void) +{ + arch_gettimeoffset = ioc_timer_gettimeoffset; + ioctime_init(); + setup_irq(IRQ_TIMER0, &ioc_timer_irq); +} -- cgit 1.2.3-korg