diff options
Diffstat (limited to 'arch/arm/mach-imx/time.c')
| -rw-r--r-- | arch/arm/mach-imx/time.c | 220 |
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 5aef18b..0000000 --- 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, -}; |
