diff options
Diffstat (limited to 'arch/arm/mach-nomadik/timer.c')
| -rw-r--r-- | arch/arm/mach-nomadik/timer.c | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/arch/arm/mach-nomadik/timer.c b/arch/arm/mach-nomadik/timer.c deleted file mode 100644 index d1738e7061d4..000000000000 --- a/arch/arm/mach-nomadik/timer.c +++ /dev/null @@ -1,164 +0,0 @@ -/* - * linux/arch/arm/mach-nomadik/timer.c - * - * Copyright (C) 2008 STMicroelectronics - * Copyright (C) 2009 Alessandro Rubini, somewhat based on at91sam926x - * - * 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/init.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/io.h> -#include <linux/clockchips.h> -#include <linux/jiffies.h> -#include <asm/mach/time.h> -#include <mach/mtu.h> - -#define TIMER_CTRL 0x80 /* No divisor */ -#define TIMER_PERIODIC 0x40 -#define TIMER_SZ32BIT 0x02 - -/* Initial value for SRC control register: all timers use MXTAL/8 source */ -#define SRC_CR_INIT_MASK 0x00007fff -#define SRC_CR_INIT_VAL 0x2aaa8000 - -static u32 nmdk_count; /* accumulated count */ -static u32 nmdk_cycle; /* write-once */ -static __iomem void *mtu_base; - -/* - * clocksource: the MTU device is a decrementing counters, so we negate - * the value being read. - */ -static cycle_t nmdk_read_timer(struct clocksource *cs) -{ - u32 count = readl(mtu_base + MTU_VAL(0)); - return nmdk_count + nmdk_cycle - count; - -} - -static struct clocksource nmdk_clksrc = { - .name = "mtu_0", - .rating = 120, - .read = nmdk_read_timer, - .shift = 20, - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -/* - * Clockevent device: currently only periodic mode is supported - */ -static void nmdk_clkevt_mode(enum clock_event_mode mode, - struct clock_event_device *dev) -{ - unsigned long flags; - - switch (mode) { - case CLOCK_EVT_MODE_PERIODIC: - /* enable interrupts -- and count current value? */ - raw_local_irq_save(flags); - writel(readl(mtu_base + MTU_IMSC) | 1, mtu_base + MTU_IMSC); - raw_local_irq_restore(flags); - break; - case CLOCK_EVT_MODE_ONESHOT: - BUG(); /* Not supported, yet */ - /* FALLTHROUGH */ - case CLOCK_EVT_MODE_SHUTDOWN: - case CLOCK_EVT_MODE_UNUSED: - /* disable irq */ - raw_local_irq_save(flags); - writel(readl(mtu_base + MTU_IMSC) & ~1, mtu_base + MTU_IMSC); - raw_local_irq_restore(flags); - break; - case CLOCK_EVT_MODE_RESUME: - break; - } -} - -static struct clock_event_device nmdk_clkevt = { - .name = "mtu_0", - .features = CLOCK_EVT_FEAT_PERIODIC, - .shift = 32, - .rating = 100, - .set_mode = nmdk_clkevt_mode, -}; - -/* - * IRQ Handler for the timer 0 of the MTU block. The irq is not shared - * as we are the only users of mtu0 by now. - */ -static irqreturn_t nmdk_timer_interrupt(int irq, void *dev_id) -{ - /* ack: "interrupt clear register" */ - writel( 1 << 0, mtu_base + MTU_ICR); - - /* we can't count lost ticks, unfortunately */ - nmdk_count += nmdk_cycle; - nmdk_clkevt.event_handler(&nmdk_clkevt); - - return IRQ_HANDLED; -} - -/* - * Set up timer interrupt, and return the current time in seconds. - */ -static struct irqaction nmdk_timer_irq = { - .name = "Nomadik Timer Tick", - .flags = IRQF_DISABLED | IRQF_TIMER, - .handler = nmdk_timer_interrupt, -}; - -static void nmdk_timer_reset(void) -{ - u32 cr; - - writel(0, mtu_base + MTU_CR(0)); /* off */ - - /* configure load and background-load, and fire it up */ - writel(nmdk_cycle, mtu_base + MTU_LR(0)); - writel(nmdk_cycle, mtu_base + MTU_BGLR(0)); - cr = MTU_CRn_PERIODIC | MTU_CRn_PRESCALE_1 | MTU_CRn_32BITS; - writel(cr, mtu_base + MTU_CR(0)); - writel(cr | MTU_CRn_ENA, mtu_base + MTU_CR(0)); -} - -static void __init nmdk_timer_init(void) -{ - u32 src_cr; - unsigned long rate; - int bits; - - rate = CLOCK_TICK_RATE; /* 2.4MHz */ - nmdk_cycle = (rate + HZ/2) / HZ; - - /* Configure timer sources in "system reset controller" ctrl reg */ - src_cr = readl(io_p2v(NOMADIK_SRC_BASE)); - src_cr &= SRC_CR_INIT_MASK; - src_cr |= SRC_CR_INIT_VAL; - writel(src_cr, io_p2v(NOMADIK_SRC_BASE)); - - /* Save global pointer to mtu, used by functions above */ - mtu_base = io_p2v(NOMADIK_MTU0_BASE); - - /* Init the timer and register clocksource */ - nmdk_timer_reset(); - - nmdk_clksrc.mult = clocksource_hz2mult(rate, nmdk_clksrc.shift); - bits = 8*sizeof(nmdk_count); - nmdk_clksrc.mask = CLOCKSOURCE_MASK(bits); - - clocksource_register(&nmdk_clksrc); - - /* Register irq and clockevents */ - setup_irq(IRQ_MTU0, &nmdk_timer_irq); - nmdk_clkevt.mult = div_sc(rate, NSEC_PER_SEC, nmdk_clkevt.shift); - nmdk_clkevt.cpumask = cpumask_of(0); - clockevents_register_device(&nmdk_clkevt); -} - -struct sys_timer nomadik_timer = { - .init = nmdk_timer_init, -}; |