[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.

diff --git a/arch/m68knommu/platform/5307/timers.c b/arch/m68knommu/platform/5307/timers.c
new file mode 100644 (file)
index 0000000..66ea924
--- /dev/null
+++ b/arch/m68knommu/platform/5307/timers.c
@@ -0,0 +1,127 @@
+/***************************************************************************/
+
+/*
+ *     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 */
+/***************************************************************************/