diff options
Diffstat (limited to 'arch/arm/plat-mxc/time.c')
| -rw-r--r-- | arch/arm/plat-mxc/time.c | 228 |
1 files changed, 0 insertions, 228 deletions
diff --git a/arch/arm/plat-mxc/time.c b/arch/arm/plat-mxc/time.c deleted file mode 100644 index 758a1293bcf..00000000000 --- a/arch/arm/plat-mxc/time.c +++ /dev/null @@ -1,228 +0,0 @@ -/* - * linux/arch/arm/plat-mxc/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) - * Copyright (C) 2008 Juergen Beisert (kernel@pengutronix.de) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, - * MA 02110-1301, USA. - */ - -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/clockchips.h> -#include <linux/clk.h> - -#include <mach/hardware.h> -#include <asm/mach/time.h> -#include <mach/common.h> -#include <mach/mxc_timer.h> - -static struct clock_event_device clockevent_mxc; -static enum clock_event_mode clockevent_mode = CLOCK_EVT_MODE_UNUSED; - -/* clock source for the timer */ -static struct clk *timer_clk; - -/* clock source */ - -static cycle_t mxc_get_cycles(void) -{ - return __raw_readl(TIMER_BASE + MXC_TCN); -} - -static struct clocksource clocksource_mxc = { - .name = "mxc_timer1", - .rating = 200, - .read = mxc_get_cycles, - .mask = CLOCKSOURCE_MASK(32), - .shift = 20, - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -static int __init mxc_clocksource_init(void) -{ - unsigned int clock; - - clock = clk_get_rate(timer_clk); - - clocksource_mxc.mult = clocksource_hz2mult(clock, - clocksource_mxc.shift); - clocksource_register(&clocksource_mxc); - - return 0; -} - -/* clock event */ - -static int mxc_set_next_event(unsigned long evt, - struct clock_event_device *unused) -{ - unsigned long tcmp; - - tcmp = __raw_readl(TIMER_BASE + MXC_TCN) + evt; - __raw_writel(tcmp, TIMER_BASE + MXC_TCMP); - - return (int)(tcmp - __raw_readl(TIMER_BASE + MXC_TCN)) < 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 mxc_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 mxc_set_next_event() - */ - local_irq_save(flags); - - /* Disable interrupt in GPT module */ - gpt_irq_disable(); - - if (mode != clockevent_mode) { - /* Set event time into far-far future */ - __raw_writel(__raw_readl(TIMER_BASE + MXC_TCN) - 3, - TIMER_BASE + MXC_TCMP); - /* Clear pending interrupt */ - gpt_irq_acknowledge(); - } - -#ifdef DEBUG - printk(KERN_INFO "mxc_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"mxc_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 - * mxc_set_next_event(), the core has about 4 minutes - * to call mxc_set_next_event() or shutdown clock after - * mode switching - */ - local_irq_save(flags); - gpt_irq_enable(); - 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 appear */ - break; - } -} - -/* - * IRQ handler for the timer - */ -static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id) -{ - struct clock_event_device *evt = &clockevent_mxc; - uint32_t tstat; - - tstat = __raw_readl(TIMER_BASE + MXC_TSTAT); - - gpt_irq_acknowledge(); - - evt->event_handler(evt); - - return IRQ_HANDLED; -} - -static struct irqaction mxc_timer_irq = { - .name = "i.MX Timer Tick", - .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, - .handler = mxc_timer_interrupt, -}; - -static struct clock_event_device clockevent_mxc = { - .name = "mxc_timer1", - .features = CLOCK_EVT_FEAT_ONESHOT, - .shift = 32, - .set_mode = mxc_set_mode, - .set_next_event = mxc_set_next_event, - .rating = 200, -}; - -static int __init mxc_clockevent_init(void) -{ - unsigned int clock; - - clock = clk_get_rate(timer_clk); - - clockevent_mxc.mult = div_sc(clock, NSEC_PER_SEC, - clockevent_mxc.shift); - clockevent_mxc.max_delta_ns = - clockevent_delta2ns(0xfffffffe, &clockevent_mxc); - clockevent_mxc.min_delta_ns = - clockevent_delta2ns(0xff, &clockevent_mxc); - - clockevent_mxc.cpumask = cpumask_of(0); - - clockevents_register_device(&clockevent_mxc); - - return 0; -} - -void __init mxc_timer_init(const char *clk_timer) -{ - timer_clk = clk_get(NULL, clk_timer); - if (!timer_clk) { - printk(KERN_ERR"Cannot determine timer clock. Giving up.\n"); - return; - } - - clk_enable(timer_clk); - - /* - * Initialise to a known state (all timers off, and timing reset) - */ - __raw_writel(0, TIMER_BASE + MXC_TCTL); - __raw_writel(0, TIMER_BASE + MXC_TPRER); /* see datasheet note */ - - __raw_writel(TCTL_FRR | /* free running */ - TCTL_VAL | /* set clocksource and arch specific bits */ - TCTL_TEN, /* start the timer */ - TIMER_BASE + MXC_TCTL); - - /* init and register the timer to the framework */ - mxc_clocksource_init(); - mxc_clockevent_init(); - - /* Make irqs happen */ - setup_irq(TIMER_INTERRUPT, &mxc_timer_irq); -} - |