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Diffstat (limited to 'arch/unicore32/kernel/time.c')
-rw-r--r-- | arch/unicore32/kernel/time.c | 128 |
1 files changed, 0 insertions, 128 deletions
diff --git a/arch/unicore32/kernel/time.c b/arch/unicore32/kernel/time.c deleted file mode 100644 index c3a37edf4d40..000000000000 --- a/arch/unicore32/kernel/time.c +++ /dev/null @@ -1,128 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * linux/arch/unicore32/kernel/time.c - * - * Code specific to PKUnity SoC and UniCore ISA - * - * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn> - * Copyright (C) 2001-2010 Guan Xuetao - */ -#include <linux/init.h> -#include <linux/errno.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/timex.h> -#include <linux/clockchips.h> - -#include <mach/hardware.h> - -#define MIN_OSCR_DELTA 2 - -static irqreturn_t puv3_ost0_interrupt(int irq, void *dev_id) -{ - struct clock_event_device *c = dev_id; - - /* Disarm the compare/match, signal the event. */ - writel(readl(OST_OIER) & ~OST_OIER_E0, OST_OIER); - writel(readl(OST_OSSR) & ~OST_OSSR_M0, OST_OSSR); - c->event_handler(c); - - return IRQ_HANDLED; -} - -static int -puv3_osmr0_set_next_event(unsigned long delta, struct clock_event_device *c) -{ - unsigned long next, oscr; - - writel(readl(OST_OIER) | OST_OIER_E0, OST_OIER); - next = readl(OST_OSCR) + delta; - writel(next, OST_OSMR0); - oscr = readl(OST_OSCR); - - return (signed)(next - oscr) <= MIN_OSCR_DELTA ? -ETIME : 0; -} - -static int puv3_osmr0_shutdown(struct clock_event_device *evt) -{ - writel(readl(OST_OIER) & ~OST_OIER_E0, OST_OIER); - writel(readl(OST_OSSR) & ~OST_OSSR_M0, OST_OSSR); - return 0; -} - -static struct clock_event_device ckevt_puv3_osmr0 = { - .name = "osmr0", - .features = CLOCK_EVT_FEAT_ONESHOT, - .rating = 200, - .set_next_event = puv3_osmr0_set_next_event, - .set_state_shutdown = puv3_osmr0_shutdown, - .set_state_oneshot = puv3_osmr0_shutdown, -}; - -static u64 puv3_read_oscr(struct clocksource *cs) -{ - return readl(OST_OSCR); -} - -static struct clocksource cksrc_puv3_oscr = { - .name = "oscr", - .rating = 200, - .read = puv3_read_oscr, - .mask = CLOCKSOURCE_MASK(32), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -void __init time_init(void) -{ - writel(0, OST_OIER); /* disable any timer interrupts */ - writel(0, OST_OSSR); /* clear status on all timers */ - - clockevents_calc_mult_shift(&ckevt_puv3_osmr0, CLOCK_TICK_RATE, 5); - - ckevt_puv3_osmr0.max_delta_ns = - clockevent_delta2ns(0x7fffffff, &ckevt_puv3_osmr0); - ckevt_puv3_osmr0.max_delta_ticks = 0x7fffffff; - ckevt_puv3_osmr0.min_delta_ns = - clockevent_delta2ns(MIN_OSCR_DELTA * 2, &ckevt_puv3_osmr0) + 1; - ckevt_puv3_osmr0.min_delta_ticks = MIN_OSCR_DELTA * 2; - ckevt_puv3_osmr0.cpumask = cpumask_of(0); - - if (request_irq(IRQ_TIMER0, puv3_ost0_interrupt, - IRQF_TIMER | IRQF_IRQPOLL, "ost0", &ckevt_puv3_osmr0)) - pr_err("Failed to register ost0 interrupt\n"); - - clocksource_register_hz(&cksrc_puv3_oscr, CLOCK_TICK_RATE); - clockevents_register_device(&ckevt_puv3_osmr0); -} - -#ifdef CONFIG_PM -unsigned long osmr[4], oier; - -void puv3_timer_suspend(void) -{ - osmr[0] = readl(OST_OSMR0); - osmr[1] = readl(OST_OSMR1); - osmr[2] = readl(OST_OSMR2); - osmr[3] = readl(OST_OSMR3); - oier = readl(OST_OIER); -} - -void puv3_timer_resume(void) -{ - writel(0, OST_OSSR); - writel(osmr[0], OST_OSMR0); - writel(osmr[1], OST_OSMR1); - writel(osmr[2], OST_OSMR2); - writel(osmr[3], OST_OSMR3); - writel(oier, OST_OIER); - - /* - * OSMR0 is the system timer: make sure OSCR is sufficiently behind - */ - writel(readl(OST_OSMR0) - LATCH, OST_OSCR); -} -#else -void puv3_timer_suspend(void) { }; -void puv3_timer_resume(void) { }; -#endif - |