From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932067Ab1FINJ7 (ORCPT ); Thu, 9 Jun 2011 09:09:59 -0400 Received: from www.linutronix.de ([62.245.132.108]:59795 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757650Ab1FINI3 (ORCPT ); Thu, 9 Jun 2011 09:08:29 -0400 Message-Id: <20110609130622.133068765@linutronix.de> User-Agent: quilt/0.48-1 Date: Thu, 09 Jun 2011 13:08:27 -0000 From: Thomas Gleixner To: LKML Cc: Russell King , Ralf Baechle , Ingo Molnar , John Stultz Subject: [patch 3/5] mips: Use common i8253 clockevent References: <20110609130509.346588418@linutronix.de> Content-Disposition: inline; filename=mips-use-common-i8253-ce.patch X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Thomas Gleixner Cc: Ralf Baechle --- arch/mips/Kconfig | 1 arch/mips/kernel/i8253.c | 97 ----------------------------------------------- 2 files changed, 3 insertions(+), 95 deletions(-) Index: linux-2.6-tip/arch/mips/Kconfig =================================================================== --- linux-2.6-tip.orig/arch/mips/Kconfig +++ linux-2.6-tip/arch/mips/Kconfig @@ -2391,6 +2391,7 @@ config MMU config I8253 bool select CLKSRC_I8253 + select CLKEVT_I8253 select MIPS_EXTERNAL_TIMER config ZONE_DMA32 Index: linux-2.6-tip/arch/mips/kernel/i8253.c =================================================================== --- linux-2.6-tip.orig/arch/mips/kernel/i8253.c +++ linux-2.6-tip/arch/mips/kernel/i8253.c @@ -4,92 +4,15 @@ */ #include #include -#include -#include -#include #include #include -#include #include -#include -#include #include -/* - * Initialize the PIT timer. - * - * This is also called after resume to bring the PIT into operation again. - */ -static void init_pit_timer(enum clock_event_mode mode, - struct clock_event_device *evt) -{ - raw_spin_lock(&i8253_lock); - - switch(mode) { - case CLOCK_EVT_MODE_PERIODIC: - /* binary, mode 2, LSB/MSB, ch 0 */ - outb_p(0x34, PIT_MODE); - outb_p(LATCH & 0xff , PIT_CH0); /* LSB */ - outb(LATCH >> 8 , PIT_CH0); /* MSB */ - break; - - case CLOCK_EVT_MODE_SHUTDOWN: - case CLOCK_EVT_MODE_UNUSED: - if (evt->mode == CLOCK_EVT_MODE_PERIODIC || - evt->mode == CLOCK_EVT_MODE_ONESHOT) { - outb_p(0x30, PIT_MODE); - outb_p(0, PIT_CH0); - outb_p(0, PIT_CH0); - } - break; - - case CLOCK_EVT_MODE_ONESHOT: - /* One shot setup */ - outb_p(0x38, PIT_MODE); - break; - - case CLOCK_EVT_MODE_RESUME: - /* Nothing to do here */ - break; - } - raw_spin_unlock(&i8253_lock); -} - -/* - * Program the next event in oneshot mode - * - * Delta is given in PIT ticks - */ -static int pit_next_event(unsigned long delta, struct clock_event_device *evt) -{ - raw_spin_lock(&i8253_lock); - outb_p(delta & 0xff , PIT_CH0); /* LSB */ - outb(delta >> 8 , PIT_CH0); /* MSB */ - raw_spin_unlock(&i8253_lock); - - return 0; -} - -/* - * On UP the PIT can serve all of the possible timer functions. On SMP systems - * it can be solely used for the global tick. - * - * The profiling and update capabilites are switched off once the local apic is - * registered. This mechanism replaces the previous #ifdef LOCAL_APIC - - * !using_apic_timer decisions in do_timer_interrupt_hook() - */ -static struct clock_event_device pit_clockevent = { - .name = "pit", - .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, - .set_mode = init_pit_timer, - .set_next_event = pit_next_event, - .irq = 0, -}; - static irqreturn_t timer_interrupt(int irq, void *dev_id) { - pit_clockevent.event_handler(&pit_clockevent); + i8253_clockevent.event_handler(&pit_clockevent); return IRQ_HANDLED; } @@ -100,25 +23,9 @@ static struct irqaction irq0 = { .name = "timer" }; -/* - * Initialize the conversion factor and the min/max deltas of the clock event - * structure and register the clock event source with the framework. - */ void __init setup_pit_timer(void) { - struct clock_event_device *cd = &pit_clockevent; - unsigned int cpu = smp_processor_id(); - - /* - * Start pit with the boot cpu mask and make it global after the - * IO_APIC has been initialized. - */ - cd->cpumask = cpumask_of(cpu); - clockevent_set_clock(cd, CLOCK_TICK_RATE); - cd->max_delta_ns = clockevent_delta2ns(0x7FFF, cd); - cd->min_delta_ns = clockevent_delta2ns(0xF, cd); - clockevents_register_device(cd); - + clockevent_i8253_init(true); setup_irq(0, &irq0); }