[PATCH] m68knommu: read/write register access for ColdFire core timer

Modify the m68knommu/ColdFire core timer code to use register offsets
with raw_read/raw_write access, instead of a mapped struct.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/m68knommu/platform/5307/timers.c b/arch/m68knommu/platform/5307/timers.c
index ef49596..83b8b89 100644 (file)
--- a/arch/m68knommu/platform/5307/timers.c
+++ b/arch/m68knommu/platform/5307/timers.c
@@ -14,6 +14,7 @@
 #include <linux/param.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
+#include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/traps.h>
 #include <asm/machdep.h>
@@ -24,6 +25,11 @@
 /***************************************************************************/
 
 /*
+ *     By default use timer1 as the system clock timer.
+ */
+#define        TA(a)   (MCF_MBAR + MCFTIMER_BASE1 + (a))
+
+/*
  *     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.
@@ -32,8 +38,6 @@ unsigned int  mcf_timervector = 29;
 unsigned int   mcf_profilevector = 31;
 unsigned int   mcf_timerlevel = 5;
 
-static volatile struct mcftimer *mcf_timerp;
-
 /*
  *     These provide the underlying interrupt vector support.
  *     Unfortunately it is a little different on each ColdFire.
@@ -46,20 +50,17 @@ extern int mcf_timerirqpending(int timer);
 void coldfire_tick(void)
 {
        /* Reset the ColdFire timer */
-       mcf_timerp->ter = MCFTIMER_TER_CAP | MCFTIMER_TER_REF;
+       __raw_writeb(MCFTIMER_TER_CAP | MCFTIMER_TER_REF, TA(MCFTIMER_TER));
 }
 
 /***************************************************************************/
 
 void coldfire_timer_init(irqreturn_t (*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;
+       __raw_writew(MCFTIMER_TMR_DISABLE, TA(MCFTIMER_TMR));
+       __raw_writew(((MCF_BUSCLK / 16) / HZ), TA(MCFTIMER_TRR));
+       __raw_writew(MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 |
+               MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE, TA(MCFTIMER_TMR));
 
        request_irq(mcf_timervector, handler, SA_INTERRUPT, "timer", NULL);
        mcf_settimericr(1, mcf_timerlevel);
@@ -75,13 +76,8 @@ unsigned long coldfire_timer_offset(void)
 {
        unsigned long trr, tcn, offset;
 
-       /*
-        * The change to pointer and de-reference is to force the compiler
-        * to read the registers with a single 16bit access. Otherwise it
-        * does some crazy 8bit read combining.
-        */
-       tcn = *(&mcf_timerp->tcn);
-       trr = *(&mcf_timerp->trr);
+       tcn = __raw_readw(TA(MCFTIMER_TCN));
+       trr = __raw_readw(TA(MCFTIMER_TRR));
        offset = (tcn * (1000000 / HZ)) / trr;
 
        /* Check if we just wrapped the counters and maybe missed a tick */
@@ -95,21 +91,23 @@ unsigned long coldfire_timer_offset(void)
 /***************************************************************************/
 
 /*
+ *     By default use timer2 as the profiler clock timer.
+ */
+#define        PA(a)   (MCF_MBAR + MCFTIMER_BASE2 + (a))
+
+/*
  *     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;
+       __raw_writeb(MCFTIMER_TER_CAP | MCFTIMER_TER_REF, PA(MCFTIMER_TER));
        if (current->pid)
                profile_tick(CPU_PROFILING, regs);
 }
@@ -121,12 +119,11 @@ 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 */
-       mcf_proftp = (volatile struct mcftimer *) (MCF_MBAR + MCFTIMER_BASE2);
-       mcf_proftp->tmr = MCFTIMER_TMR_DISABLE;
+       __raw_writew(MCFTIMER_TMR_DISABLE, PA(MCFTIMER_TMR));
 
-       mcf_proftp->trr = (unsigned short) ((MCF_CLK / 16) / PROFILEHZ);
-       mcf_proftp->tmr = MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 |
-               MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE;
+       __raw_writew(((MCF_CLK / 16) / PROFILEHZ), PA(MCFTIMER_TRR));
+       __raw_writew(MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 |
+               MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE, PA(MCFTIMER_TMR));
 
        request_irq(mcf_profilevector, coldfire_profile_tick,
                (SA_INTERRUPT | IRQ_FLG_FAST), "profile timer", NULL);

diff --git a/include/asm-m68knommu/mcftimer.h b/include/asm-m68knommu/mcftimer.h
index 68bf33a..6f4d796 100644 (file)
--- a/include/asm-m68knommu/mcftimer.h
+++ b/include/asm-m68knommu/mcftimer.h
@@ -3,7 +3,7 @@
 /*
  *     mcftimer.h -- ColdFire internal TIMER support defines.
  *
- *     (C) Copyright 1999-2002, Greg Ungerer (gerg@snapgear.com)
+ *     (C) Copyright 1999-2006, Greg Ungerer <gerg@snapgear.com>
  *     (C) Copyright 2000, Lineo Inc. (www.lineo.com) 
  */
 
@@ -27,6 +27,11 @@
 #elif defined(CONFIG_M5249) || defined(CONFIG_M5307) || defined(CONFIG_M5407)
 #define MCFTIMER_BASE1         0x140           /* Base address of TIMER1 */
 #define MCFTIMER_BASE2         0x180           /* Base address of TIMER2 */
+#elif defined(CONFIG_M532x)
+#define MCFTIMER_BASE1         0xfc070000      /* Base address of TIMER1 */
+#define MCFTIMER_BASE2         0xfc074000      /* Base address of TIMER2 */
+#define MCFTIMER_BASE3         0xfc078000      /* Base address of TIMER3 */
+#define MCFTIMER_BASE4         0xfc07c000      /* Base address of TIMER4 */
 #endif
 
 
@@ -34,23 +39,14 @@
  *     Define the TIMER register set addresses.
  */
 #define        MCFTIMER_TMR            0x00            /* Timer Mode reg (r/w) */
-#define        MCFTIMER_TRR            0x02            /* Timer Reference (r/w) */
-#define        MCFTIMER_TCR            0x04            /* Timer Capture reg (r/w) */
-#define        MCFTIMER_TCN            0x06            /* Timer Counter reg (r/w) */
+#define        MCFTIMER_TRR            0x04            /* Timer Reference (r/w) */
+#define        MCFTIMER_TCR            0x08            /* Timer Capture reg (r/w) */
+#define        MCFTIMER_TCN            0x0C            /* Timer Counter reg (r/w) */
+#if defined(CONFIG_M532x)
+#define        MCFTIMER_TER            0x03            /* Timer Event reg (r/w) */
+#else
 #define        MCFTIMER_TER            0x11            /* Timer Event reg (r/w) */
-
-struct mcftimer {
-       unsigned short  tmr;                    /* Timer Mode reg (r/w) */
-       unsigned short  reserved1;
-       unsigned short  trr;                    /* Timer Reference (r/w) */
-       unsigned short  reserved2;
-       unsigned short  tcr;                    /* Timer Capture reg (r/w) */
-       unsigned short  reserved3;
-       unsigned short  tcn;                    /* Timer Counter reg (r/w) */
-       unsigned short  reserved4;
-       unsigned char   reserved5;
-       unsigned char   ter;                    /* Timer Event reg (r/w) */
-} __attribute__((packed));
+#endif
 
 /*
  *     Bit definitions for the Timer Mode Register (TMR).