diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/mach-pxa/time.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/mach-pxa/time.c | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/ANDROID_3.4.5/arch/arm/mach-pxa/time.c b/ANDROID_3.4.5/arch/arm/mach-pxa/time.c deleted file mode 100644 index 3d6c9bd9..00000000 --- a/ANDROID_3.4.5/arch/arm/mach-pxa/time.c +++ /dev/null @@ -1,170 +0,0 @@ -/* - * arch/arm/mach-pxa/time.c - * - * PXA clocksource, clockevents, and OST interrupt handlers. - * Copyright (c) 2007 by Bill Gatliff <bgat@billgatliff.com>. - * - * Derived from Nicolas Pitre's PXA timer handler Copyright (c) 2001 - * by MontaVista Software, Inc. (Nico, your code rocks!) - * - * 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. - */ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/clockchips.h> - -#include <asm/div64.h> -#include <asm/mach/irq.h> -#include <asm/mach/time.h> -#include <asm/sched_clock.h> -#include <mach/regs-ost.h> -#include <mach/irqs.h> - -/* - * This is PXA's sched_clock implementation. This has a resolution - * of at least 308 ns and a maximum value of 208 days. - * - * The return value is guaranteed to be monotonic in that range as - * long as there is always less than 582 seconds between successive - * calls to sched_clock() which should always be the case in practice. - */ - -static u32 notrace pxa_read_sched_clock(void) -{ - return OSCR; -} - - -#define MIN_OSCR_DELTA 16 - -static irqreturn_t -pxa_ost0_interrupt(int irq, void *dev_id) -{ - struct clock_event_device *c = dev_id; - - /* Disarm the compare/match, signal the event. */ - OIER &= ~OIER_E0; - OSSR = OSSR_M0; - c->event_handler(c); - - return IRQ_HANDLED; -} - -static int -pxa_osmr0_set_next_event(unsigned long delta, struct clock_event_device *dev) -{ - unsigned long next, oscr; - - OIER |= OIER_E0; - next = OSCR + delta; - OSMR0 = next; - oscr = OSCR; - - return (signed)(next - oscr) <= MIN_OSCR_DELTA ? -ETIME : 0; -} - -static void -pxa_osmr0_set_mode(enum clock_event_mode mode, struct clock_event_device *dev) -{ - switch (mode) { - case CLOCK_EVT_MODE_ONESHOT: - OIER &= ~OIER_E0; - OSSR = OSSR_M0; - break; - - case CLOCK_EVT_MODE_UNUSED: - case CLOCK_EVT_MODE_SHUTDOWN: - /* initializing, released, or preparing for suspend */ - OIER &= ~OIER_E0; - OSSR = OSSR_M0; - break; - - case CLOCK_EVT_MODE_RESUME: - case CLOCK_EVT_MODE_PERIODIC: - break; - } -} - -static struct clock_event_device ckevt_pxa_osmr0 = { - .name = "osmr0", - .features = CLOCK_EVT_FEAT_ONESHOT, - .rating = 200, - .set_next_event = pxa_osmr0_set_next_event, - .set_mode = pxa_osmr0_set_mode, -}; - -static struct irqaction pxa_ost0_irq = { - .name = "ost0", - .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, - .handler = pxa_ost0_interrupt, - .dev_id = &ckevt_pxa_osmr0, -}; - -static void __init pxa_timer_init(void) -{ - unsigned long clock_tick_rate = get_clock_tick_rate(); - - OIER = 0; - OSSR = OSSR_M0 | OSSR_M1 | OSSR_M2 | OSSR_M3; - - setup_sched_clock(pxa_read_sched_clock, 32, clock_tick_rate); - - clockevents_calc_mult_shift(&ckevt_pxa_osmr0, clock_tick_rate, 4); - ckevt_pxa_osmr0.max_delta_ns = - clockevent_delta2ns(0x7fffffff, &ckevt_pxa_osmr0); - ckevt_pxa_osmr0.min_delta_ns = - clockevent_delta2ns(MIN_OSCR_DELTA * 2, &ckevt_pxa_osmr0) + 1; - ckevt_pxa_osmr0.cpumask = cpumask_of(0); - - setup_irq(IRQ_OST0, &pxa_ost0_irq); - - clocksource_mmio_init(&OSCR, "oscr0", clock_tick_rate, 200, 32, - clocksource_mmio_readl_up); - clockevents_register_device(&ckevt_pxa_osmr0); -} - -#ifdef CONFIG_PM -static unsigned long osmr[4], oier, oscr; - -static void pxa_timer_suspend(void) -{ - osmr[0] = OSMR0; - osmr[1] = OSMR1; - osmr[2] = OSMR2; - osmr[3] = OSMR3; - oier = OIER; - oscr = OSCR; -} - -static void pxa_timer_resume(void) -{ - /* - * Ensure that we have at least MIN_OSCR_DELTA between match - * register 0 and the OSCR, to guarantee that we will receive - * the one-shot timer interrupt. We adjust OSMR0 in preference - * to OSCR to guarantee that OSCR is monotonically incrementing. - */ - if (osmr[0] - oscr < MIN_OSCR_DELTA) - osmr[0] += MIN_OSCR_DELTA; - - OSMR0 = osmr[0]; - OSMR1 = osmr[1]; - OSMR2 = osmr[2]; - OSMR3 = osmr[3]; - OIER = oier; - OSCR = oscr; -} -#else -#define pxa_timer_suspend NULL -#define pxa_timer_resume NULL -#endif - -struct sys_timer pxa_timer = { - .init = pxa_timer_init, - .suspend = pxa_timer_suspend, - .resume = pxa_timer_resume, -}; |