diff options
Diffstat (limited to 'arch/m68knommu/platform/coldfire/pit.c')
| -rw-r--r-- | arch/m68knommu/platform/coldfire/pit.c | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/arch/m68knommu/platform/coldfire/pit.c b/arch/m68knommu/platform/coldfire/pit.c deleted file mode 100644 index 4290638012e..00000000000 --- a/arch/m68knommu/platform/coldfire/pit.c +++ /dev/null @@ -1,113 +0,0 @@ -/***************************************************************************/ - -/* - * pit.c -- Freescale ColdFire PIT timer. Currently this type of - * hardware timer only exists in the Freescale ColdFire - * 5270/5271, 5282 and 5208 CPUs. No doubt newer ColdFire - * family members will probably use it too. - * - * Copyright (C) 1999-2008, Greg Ungerer (gerg@snapgear.com) - * Copyright (C) 2001-2004, SnapGear Inc. (www.snapgear.com) - */ - -/***************************************************************************/ - -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/param.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/clocksource.h> -#include <asm/machdep.h> -#include <asm/io.h> -#include <asm/coldfire.h> -#include <asm/mcfpit.h> -#include <asm/mcfsim.h> - -/***************************************************************************/ - -/* - * By default use timer1 as the system clock timer. - */ -#define FREQ ((MCF_CLK / 2) / 64) -#define TA(a) (MCF_IPSBAR + MCFPIT_BASE1 + (a)) -#define INTC0 (MCF_IPSBAR + MCFICM_INTC0) - -static u32 pit_cycles_per_jiffy; -static u32 pit_cnt; - -/***************************************************************************/ - -static irqreturn_t pit_tick(int irq, void *dummy) -{ - u16 pcsr; - - /* Reset the ColdFire timer */ - pcsr = __raw_readw(TA(MCFPIT_PCSR)); - __raw_writew(pcsr | MCFPIT_PCSR_PIF, TA(MCFPIT_PCSR)); - - pit_cnt += pit_cycles_per_jiffy; - return arch_timer_interrupt(irq, dummy); -} - -/***************************************************************************/ - -static struct irqaction pit_irq = { - .name = "timer", - .flags = IRQF_DISABLED | IRQF_TIMER, - .handler = pit_tick, -}; - -/***************************************************************************/ - -static cycle_t pit_read_clk(void) -{ - unsigned long flags; - u32 cycles; - u16 pcntr; - - local_irq_save(flags); - pcntr = __raw_readw(TA(MCFPIT_PCNTR)); - cycles = pit_cnt; - local_irq_restore(flags); - - return cycles + pit_cycles_per_jiffy - pcntr; -} - -/***************************************************************************/ - -static struct clocksource pit_clk = { - .name = "pit", - .rating = 250, - .read = pit_read_clk, - .shift = 20, - .mask = CLOCKSOURCE_MASK(32), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -/***************************************************************************/ - -void hw_timer_init(void) -{ - u32 imr; - - setup_irq(MCFINT_VECBASE + MCFINT_PIT1, &pit_irq); - - __raw_writeb(ICR_INTRCONF, INTC0 + MCFINTC_ICR0 + MCFINT_PIT1); - imr = __raw_readl(INTC0 + MCFPIT_IMR); - imr &= ~MCFPIT_IMR_IBIT; - __raw_writel(imr, INTC0 + MCFPIT_IMR); - - /* Set up PIT timer 1 as poll clock */ - pit_cycles_per_jiffy = FREQ / HZ; - __raw_writew(MCFPIT_PCSR_DISABLE, TA(MCFPIT_PCSR)); - __raw_writew(pit_cycles_per_jiffy, TA(MCFPIT_PMR)); - __raw_writew(MCFPIT_PCSR_EN | MCFPIT_PCSR_PIE | MCFPIT_PCSR_OVW | - MCFPIT_PCSR_RLD | MCFPIT_PCSR_CLK64, TA(MCFPIT_PCSR)); - - pit_clk.mult = clocksource_hz2mult(FREQ, pit_clk.shift); - clocksource_register(&pit_clk); -} - -/***************************************************************************/ |
