[PATCH] create common timer code for m68knommu/ColdFire processors

This patch creates common timer setup and handling code for the m68knommu
ColdFire CPU sub-architecture. All 6 ColdFire CPU varients contain the
same hardware timers. Currently each sub-arch has its own timer code.
This reduces a lot of code duplication.

arch/m68knommu/platform/5307/timers.c

+/***************************************************************************/
+
+/*
+ *	linux/arch/m68knommu/platform/5307/timers.c
+ *
+ *	Copyright (C) 1999-2003, Greg Ungerer (gerg@snapgear.com)
+ */
+
+/***************************************************************************/
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/param.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/machdep.h>
+#include <asm/coldfire.h>
+#include <asm/mcftimer.h>
+#include <asm/mcfsim.h>
+
+/***************************************************************************/
+
+/*
+ *	Default the timer and vector to use for ColdFire. Some ColdFire
+ *	CPU's and some boards may want different. Their sub-architecture
+ *	startup code (in config.c) can change these if they want.
+ */
+unsigned int	mcf_timervector = 29;
+unsigned int	mcf_profilevector = 31;
+unsigned int	mcf_timerlevel = 5;
+
+static volatile struct mcftimer *mcf_timerp;
+
+/***************************************************************************/
+
+void coldfire_tick(void)
+{
+	/* Reset the ColdFire timer */
+	mcf_timerp->ter = MCFTIMER_TER_CAP | MCFTIMER_TER_REF;
+}
+
+void coldfire_timer_init(void (*handler)(int, void *, struct pt_regs *))
+{
+	/* Set up an internal TIMER as poll clock */
+	mcf_timerp = (volatile struct mcftimer *) (MCF_MBAR + MCFTIMER_BASE1);
+	mcf_timerp->tmr = MCFTIMER_TMR_DISABLE;
+
+	mcf_timerp->trr = (unsigned short) ((MCF_BUSCLK / 16) / HZ);
+	mcf_timerp->tmr = MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 |
+		MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE;
+
+	request_irq(mcf_timervector, handler, SA_INTERRUPT, "timer", NULL);
+	mcf_settimericr(1, mcf_timerlevel);
+
+#ifdef CONFIG_HIGHPROFILE
+	coldfire_profile_init();
+#endif
+}
+
+/***************************************************************************/
+
+unsigned long coldfire_timer_offset(void)
+{
+	unsigned long trr, tcn;
+
+	/* Get the values as longs for accurate calculation. */
+	tcn = mcf_timerp->tcn;
+	trr = mcf_timerp->trr;
+	return((tcn * (1000000 / HZ)) / trr);
+}
+
+/***************************************************************************/
+#ifdef CONFIG_HIGHPROFILE
+/***************************************************************************/
+
+/*
+ *	Choose a reasonably fast profile timer. Make it an odd value to
+ *	try and get good coverage of kernal operations.
+ */
+#define	PROFILEHZ	1013
+
+static volatile struct mcftimer *mcf_proftp;
+
+/*
+ *	Use the other timer to provide high accuracy profiling info.
+ */
+
+void coldfire_profile_tick(int irq, void *dummy, struct pt_regs *regs)
+{
+	/* Reset ColdFire timer2 */
+	mcf_proftp->ter = MCFTIMER_TER_CAP | MCFTIMER_TER_REF;
+
+        if (!user_mode(regs)) {
+                if (prof_buffer && current->pid) {
+                        extern int _stext;
+                        unsigned long ip = instruction_pointer(regs);
+                        ip -= (unsigned long) &_stext;
+                        ip >>= prof_shift;
+                        if (ip < prof_len)
+                                prof_buffer[ip]++;
+                }
+        }
+}
+
+void coldfire_profile_init(void)
+{
+	printk("PROFILE: lodging TIMER2 @ %dHz as profile timer\n", PROFILEHZ);
+
+	/* Set up TIMER 2 as high speed profile clock */
+	mcf_proftp = (volatile struct mcftimer *) (MCF_MBAR + MCFTIMER_BASE2);
+	mcf_proftp->tmr = MCFTIMER_TMR_DISABLE;
+
+	mcf_proftp->trr = (unsigned short) ((MCF_CLK / 16) / PROFILEHZ);
+	mcf_proftp->tmr = MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 |
+		MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE;
+
+	request_irq(mcf_profilevector, coldfire_profile_tick,
+		(SA_INTERRUPT | IRQ_FLG_FAST), "profile timer", NULL);
+	mcf_settimericr(2, 7);
+}
+
+/***************************************************************************/
+#endif	/* CONFIG_HIGHPROFILE */
+/***************************************************************************/