diff options
Diffstat (limited to 'arch/m68knommu/platform/coldfire/timers.c')
| -rw-r--r-- | arch/m68knommu/platform/coldfire/timers.c | 174 |
1 files changed, 0 insertions, 174 deletions
diff --git a/arch/m68knommu/platform/coldfire/timers.c b/arch/m68knommu/platform/coldfire/timers.c deleted file mode 100644 index 60242f65fea..00000000000 --- a/arch/m68knommu/platform/coldfire/timers.c +++ /dev/null @@ -1,174 +0,0 @@ -/***************************************************************************/ - -/* - * timers.c -- generic ColdFire hardware timer support. - * - * Copyright (C) 1999-2008, Greg Ungerer <gerg@snapgear.com> - */ - -/***************************************************************************/ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/sched.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/profile.h> -#include <linux/clocksource.h> -#include <asm/io.h> -#include <asm/traps.h> -#include <asm/machdep.h> -#include <asm/coldfire.h> -#include <asm/mcftimer.h> -#include <asm/mcfsim.h> - -/***************************************************************************/ - -/* - * By default use timer1 as the system clock timer. - */ -#define FREQ (MCF_BUSCLK / 16) -#define TA(a) (MCFTIMER_BASE1 + (a)) - -/* - * These provide the underlying interrupt vector support. - * Unfortunately it is a little different on each ColdFire. - */ -void coldfire_profile_init(void); - -#if defined(CONFIG_M532x) -#define __raw_readtrr __raw_readl -#define __raw_writetrr __raw_writel -#else -#define __raw_readtrr __raw_readw -#define __raw_writetrr __raw_writew -#endif - -static u32 mcftmr_cycles_per_jiffy; -static u32 mcftmr_cnt; - -/***************************************************************************/ - -static irqreturn_t mcftmr_tick(int irq, void *dummy) -{ - /* Reset the ColdFire timer */ - __raw_writeb(MCFTIMER_TER_CAP | MCFTIMER_TER_REF, TA(MCFTIMER_TER)); - - mcftmr_cnt += mcftmr_cycles_per_jiffy; - return arch_timer_interrupt(irq, dummy); -} - -/***************************************************************************/ - -static struct irqaction mcftmr_timer_irq = { - .name = "timer", - .flags = IRQF_DISABLED | IRQF_TIMER, - .handler = mcftmr_tick, -}; - -/***************************************************************************/ - -static cycle_t mcftmr_read_clk(struct clocksource *cs) -{ - unsigned long flags; - u32 cycles; - u16 tcn; - - local_irq_save(flags); - tcn = __raw_readw(TA(MCFTIMER_TCN)); - cycles = mcftmr_cnt; - local_irq_restore(flags); - - return cycles + tcn; -} - -/***************************************************************************/ - -static struct clocksource mcftmr_clk = { - .name = "tmr", - .rating = 250, - .read = mcftmr_read_clk, - .shift = 20, - .mask = CLOCKSOURCE_MASK(32), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -/***************************************************************************/ - -void hw_timer_init(void) -{ - __raw_writew(MCFTIMER_TMR_DISABLE, TA(MCFTIMER_TMR)); - mcftmr_cycles_per_jiffy = FREQ / HZ; - /* - * The coldfire timer runs from 0 to TRR included, then 0 - * again and so on. It counts thus actually TRR + 1 steps - * for 1 tick, not TRR. So if you want n cycles, - * initialize TRR with n - 1. - */ - __raw_writetrr(mcftmr_cycles_per_jiffy - 1, TA(MCFTIMER_TRR)); - __raw_writew(MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 | - MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE, TA(MCFTIMER_TMR)); - - mcftmr_clk.mult = clocksource_hz2mult(FREQ, mcftmr_clk.shift); - clocksource_register(&mcftmr_clk); - - setup_irq(MCF_IRQ_TIMER, &mcftmr_timer_irq); - -#ifdef CONFIG_HIGHPROFILE - coldfire_profile_init(); -#endif -} - -/***************************************************************************/ -#ifdef CONFIG_HIGHPROFILE -/***************************************************************************/ - -/* - * By default use timer2 as the profiler clock timer. - */ -#define PA(a) (MCFTIMER_BASE2 + (a)) - -/* - * Choose a reasonably fast profile timer. Make it an odd value to - * try and get good coverage of kernel operations. - */ -#define PROFILEHZ 1013 - -/* - * Use the other timer to provide high accuracy profiling info. - */ -irqreturn_t coldfire_profile_tick(int irq, void *dummy) -{ - /* Reset ColdFire timer2 */ - __raw_writeb(MCFTIMER_TER_CAP | MCFTIMER_TER_REF, PA(MCFTIMER_TER)); - if (current->pid) - profile_tick(CPU_PROFILING); - return IRQ_HANDLED; -} - -/***************************************************************************/ - -static struct irqaction coldfire_profile_irq = { - .name = "profile timer", - .flags = IRQF_DISABLED | IRQF_TIMER, - .handler = coldfire_profile_tick, -}; - -void coldfire_profile_init(void) -{ - printk(KERN_INFO "PROFILE: lodging TIMER2 @ %dHz as profile timer\n", - PROFILEHZ); - - /* Set up TIMER 2 as high speed profile clock */ - __raw_writew(MCFTIMER_TMR_DISABLE, PA(MCFTIMER_TMR)); - - __raw_writetrr(((MCF_BUSCLK / 16) / PROFILEHZ), PA(MCFTIMER_TRR)); - __raw_writew(MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 | - MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE, PA(MCFTIMER_TMR)); - - setup_irq(MCF_IRQ_PROFILER, &coldfire_profile_irq); -} - -/***************************************************************************/ -#endif /* CONFIG_HIGHPROFILE */ -/***************************************************************************/ |