summaryrefslogtreecommitdiff
path: root/arch/arm/mach-imx/time.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-imx/time.c')
-rw-r--r--arch/arm/mach-imx/time.c220
1 files changed, 0 insertions, 220 deletions
diff --git a/arch/arm/mach-imx/time.c b/arch/arm/mach-imx/time.c
deleted file mode 100644
index 5aef18b599e5..000000000000
--- a/arch/arm/mach-imx/time.c
+++ /dev/null
@@ -1,220 +0,0 @@
-/*
- * linux/arch/arm/mach-imx/time.c
- *
- * Copyright (C) 2000-2001 Deep Blue Solutions
- * Copyright (C) 2002 Shane Nay (shane@minirl.com)
- * Copyright (C) 2006-2007 Pavel Pisa (ppisa@pikron.com)
- *
- * 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/sched.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/time.h>
-#include <linux/clocksource.h>
-#include <linux/clockchips.h>
-#include <linux/clk.h>
-#include <linux/io.h>
-
-#include <mach/hardware.h>
-#include <asm/leds.h>
-#include <asm/irq.h>
-#include <asm/mach/time.h>
-
-/* Use timer 1 as system timer */
-#define TIMER_BASE IMX_TIM1_BASE
-
-static struct clock_event_device clockevent_imx;
-static enum clock_event_mode clockevent_mode = CLOCK_EVT_MODE_UNUSED;
-
-/*
- * IRQ handler for the timer
- */
-static irqreturn_t
-imx_timer_interrupt(int irq, void *dev_id)
-{
- struct clock_event_device *evt = &clockevent_imx;
- uint32_t tstat;
- irqreturn_t ret = IRQ_NONE;
-
- /* clear the interrupt */
- tstat = IMX_TSTAT(TIMER_BASE);
- IMX_TSTAT(TIMER_BASE) = 0;
-
- if (tstat & TSTAT_COMP) {
- evt->event_handler(evt);
- ret = IRQ_HANDLED;
- }
-
- return ret;
-}
-
-static struct irqaction imx_timer_irq = {
- .name = "i.MX Timer Tick",
- .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
- .handler = imx_timer_interrupt,
-};
-
-/*
- * Set up timer hardware into expected mode and state.
- */
-static void __init imx_timer_hardware_init(void)
-{
- /*
- * Initialise to a known state (all timers off, and timing reset)
- */
- IMX_TCTL(TIMER_BASE) = 0;
- IMX_TPRER(TIMER_BASE) = 0;
-
- IMX_TCTL(TIMER_BASE) = TCTL_FRR | TCTL_CLK_PCLK1 | TCTL_TEN;
-}
-
-cycle_t imx_get_cycles(struct clocksource *cs)
-{
- return IMX_TCN(TIMER_BASE);
-}
-
-static struct clocksource clocksource_imx = {
- .name = "imx_timer1",
- .rating = 200,
- .read = imx_get_cycles,
- .mask = 0xFFFFFFFF,
- .shift = 20,
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
-static int __init imx_clocksource_init(unsigned long rate)
-{
- clocksource_imx.mult =
- clocksource_hz2mult(rate, clocksource_imx.shift);
- clocksource_register(&clocksource_imx);
-
- return 0;
-}
-
-static int imx_set_next_event(unsigned long evt,
- struct clock_event_device *unused)
-{
- unsigned long tcmp;
-
- tcmp = IMX_TCN(TIMER_BASE) + evt;
- IMX_TCMP(TIMER_BASE) = tcmp;
-
- return (int32_t)(tcmp - IMX_TCN(TIMER_BASE)) < 0 ? -ETIME : 0;
-}
-
-#ifdef DEBUG
-static const char *clock_event_mode_label[]={
- [CLOCK_EVT_MODE_PERIODIC] = "CLOCK_EVT_MODE_PERIODIC",
- [CLOCK_EVT_MODE_ONESHOT] = "CLOCK_EVT_MODE_ONESHOT",
- [CLOCK_EVT_MODE_SHUTDOWN] = "CLOCK_EVT_MODE_SHUTDOWN",
- [CLOCK_EVT_MODE_UNUSED] = "CLOCK_EVT_MODE_UNUSED"
-};
-#endif /*DEBUG*/
-
-static void imx_set_mode(enum clock_event_mode mode, struct clock_event_device *evt)
-{
- unsigned long flags;
-
- /*
- * The timer interrupt generation is disabled at least
- * for enough time to call imx_set_next_event()
- */
- local_irq_save(flags);
- /* Disable interrupt in GPT module */
- IMX_TCTL(TIMER_BASE) &= ~TCTL_IRQEN;
- if (mode != clockevent_mode) {
- /* Set event time into far-far future */
- IMX_TCMP(TIMER_BASE) = IMX_TCN(TIMER_BASE) - 3;
- /* Clear pending interrupt */
- IMX_TSTAT(TIMER_BASE) &= ~TSTAT_COMP;
- }
-
-#ifdef DEBUG
- printk(KERN_INFO "imx_set_mode: changing mode from %s to %s\n",
- clock_event_mode_label[clockevent_mode], clock_event_mode_label[mode]);
-#endif /*DEBUG*/
-
- /* Remember timer mode */
- clockevent_mode = mode;
- local_irq_restore(flags);
-
- switch (mode) {
- case CLOCK_EVT_MODE_PERIODIC:
- printk(KERN_ERR "imx_set_mode: Periodic mode is not supported for i.MX\n");
- break;
- case CLOCK_EVT_MODE_ONESHOT:
- /*
- * Do not put overhead of interrupt enable/disable into
- * imx_set_next_event(), the core has about 4 minutes
- * to call imx_set_next_event() or shutdown clock after
- * mode switching
- */
- local_irq_save(flags);
- IMX_TCTL(TIMER_BASE) |= TCTL_IRQEN;
- local_irq_restore(flags);
- break;
- case CLOCK_EVT_MODE_SHUTDOWN:
- case CLOCK_EVT_MODE_UNUSED:
- case CLOCK_EVT_MODE_RESUME:
- /* Left event sources disabled, no more interrupts appears */
- break;
- }
-}
-
-static struct clock_event_device clockevent_imx = {
- .name = "imx_timer1",
- .features = CLOCK_EVT_FEAT_ONESHOT,
- .shift = 32,
- .set_mode = imx_set_mode,
- .set_next_event = imx_set_next_event,
- .rating = 200,
-};
-
-static int __init imx_clockevent_init(unsigned long rate)
-{
- clockevent_imx.mult = div_sc(rate, NSEC_PER_SEC,
- clockevent_imx.shift);
- clockevent_imx.max_delta_ns =
- clockevent_delta2ns(0xfffffffe, &clockevent_imx);
- clockevent_imx.min_delta_ns =
- clockevent_delta2ns(0xf, &clockevent_imx);
-
- clockevent_imx.cpumask = cpumask_of(0);
-
- clockevents_register_device(&clockevent_imx);
-
- return 0;
-}
-
-extern int imx_clocks_init(void);
-
-static void __init imx_timer_init(void)
-{
- struct clk *clk;
- unsigned long rate;
-
- imx_clocks_init();
-
- clk = clk_get(NULL, "perclk1");
- clk_enable(clk);
- rate = clk_get_rate(clk);
-
- imx_timer_hardware_init();
- imx_clocksource_init(rate);
-
- imx_clockevent_init(rate);
-
- /*
- * Make irqs happen for the system timer
- */
- setup_irq(TIM1_INT, &imx_timer_irq);
-}
-
-struct sys_timer imx_timer = {
- .init = imx_timer_init,
-};