diff options
Diffstat (limited to 'arch/m68knommu/platform/coldfire/sltimers.c')
-rw-r--r-- | arch/m68knommu/platform/coldfire/sltimers.c | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/arch/m68knommu/platform/coldfire/sltimers.c b/arch/m68knommu/platform/coldfire/sltimers.c deleted file mode 100644 index 0a1b937c3e1..00000000000 --- a/arch/m68knommu/platform/coldfire/sltimers.c +++ /dev/null @@ -1,145 +0,0 @@ -/***************************************************************************/ - -/* - * sltimers.c -- generic ColdFire slice timer support. - * - * Copyright (C) 2009-2010, Philippe De Muyter <phdm@macqel.be> - * based on - * 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/mcfslt.h> -#include <asm/mcfsim.h> - -/***************************************************************************/ - -#ifdef CONFIG_HIGHPROFILE - -/* - * By default use Slice Timer 1 as the profiler clock timer. - */ -#define PA(a) (MCF_MBAR + MCFSLT_TIMER1 + (a)) - -/* - * Choose a reasonably fast profile timer. Make it an odd value to - * try and get good coverage of kernel operations. - */ -#define PROFILEHZ 1013 - -irqreturn_t mcfslt_profile_tick(int irq, void *dummy) -{ - /* Reset Slice Timer 1 */ - __raw_writel(MCFSLT_SSR_BE | MCFSLT_SSR_TE, PA(MCFSLT_SSR)); - if (current->pid) - profile_tick(CPU_PROFILING); - return IRQ_HANDLED; -} - -static struct irqaction mcfslt_profile_irq = { - .name = "profile timer", - .flags = IRQF_DISABLED | IRQF_TIMER, - .handler = mcfslt_profile_tick, -}; - -void mcfslt_profile_init(void) -{ - printk(KERN_INFO "PROFILE: lodging TIMER 1 @ %dHz as profile timer\n", - PROFILEHZ); - - setup_irq(MCF_IRQ_PROFILER, &mcfslt_profile_irq); - - /* Set up TIMER 2 as high speed profile clock */ - __raw_writel(MCF_BUSCLK / PROFILEHZ - 1, PA(MCFSLT_STCNT)); - __raw_writel(MCFSLT_SCR_RUN | MCFSLT_SCR_IEN | MCFSLT_SCR_TEN, - PA(MCFSLT_SCR)); - -} - -#endif /* CONFIG_HIGHPROFILE */ - -/***************************************************************************/ - -/* - * By default use Slice Timer 0 as the system clock timer. - */ -#define TA(a) (MCF_MBAR + MCFSLT_TIMER0 + (a)) - -static u32 mcfslt_cycles_per_jiffy; -static u32 mcfslt_cnt; - -static irqreturn_t mcfslt_tick(int irq, void *dummy) -{ - /* Reset Slice Timer 0 */ - __raw_writel(MCFSLT_SSR_BE | MCFSLT_SSR_TE, TA(MCFSLT_SSR)); - mcfslt_cnt += mcfslt_cycles_per_jiffy; - return arch_timer_interrupt(irq, dummy); -} - -static struct irqaction mcfslt_timer_irq = { - .name = "timer", - .flags = IRQF_DISABLED | IRQF_TIMER, - .handler = mcfslt_tick, -}; - -static cycle_t mcfslt_read_clk(struct clocksource *cs) -{ - unsigned long flags; - u32 cycles; - u16 scnt; - - local_irq_save(flags); - scnt = __raw_readl(TA(MCFSLT_SCNT)); - cycles = mcfslt_cnt; - local_irq_restore(flags); - - /* substract because slice timers count down */ - return cycles - scnt; -} - -static struct clocksource mcfslt_clk = { - .name = "slt", - .rating = 250, - .read = mcfslt_read_clk, - .shift = 20, - .mask = CLOCKSOURCE_MASK(32), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -void hw_timer_init(void) -{ - mcfslt_cycles_per_jiffy = MCF_BUSCLK / HZ; - /* - * The coldfire slice timer (SLT) runs from STCNT to 0 included, - * then STCNT again and so on. It counts thus actually - * STCNT + 1 steps for 1 tick, not STCNT. So if you want - * n cycles, initialize STCNT with n - 1. - */ - __raw_writel(mcfslt_cycles_per_jiffy - 1, TA(MCFSLT_STCNT)); - __raw_writel(MCFSLT_SCR_RUN | MCFSLT_SCR_IEN | MCFSLT_SCR_TEN, - TA(MCFSLT_SCR)); - /* initialize mcfslt_cnt knowing that slice timers count down */ - mcfslt_cnt = mcfslt_cycles_per_jiffy; - - setup_irq(MCF_IRQ_TIMER, &mcfslt_timer_irq); - - mcfslt_clk.mult = clocksource_hz2mult(MCF_BUSCLK, mcfslt_clk.shift); - clocksource_register(&mcfslt_clk); - -#ifdef CONFIG_HIGHPROFILE - mcfslt_profile_init(); -#endif -} |