clocksource: convert mips to generic i8253 clocksource

Convert MIPS i8253 clocksource code to use generic i8253 clocksource.

Acked-by: John Stultz <john.stultz@linaro.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 8e256cc..f7f6419 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2339,6 +2339,7 @@ config MMU
 
 config I8253
        bool
+       select CLKSRC_I8253
        select MIPS_EXTERNAL_TIMER
 
 config ZONE_DMA32

diff --git a/arch/mips/include/asm/i8253.h b/arch/mips/include/asm/i8253.h
index 48bb823..9ad0113 100644 (file)
--- a/arch/mips/include/asm/i8253.h
+++ b/arch/mips/include/asm/i8253.h
@@ -12,8 +12,13 @@
 #define PIT_CH0                        0x40
 #define PIT_CH2                        0x42
 
+#define PIT_LATCH              LATCH
+
 extern raw_spinlock_t i8253_lock;
 
 extern void setup_pit_timer(void);
 
+#define inb_pit inb_p
+#define outb_pit outb_p
+
 #endif /* __ASM_I8253_H */

diff --git a/arch/mips/kernel/i8253.c b/arch/mips/kernel/i8253.c
index 2392a7a..391221b 100644 (file)
--- a/arch/mips/kernel/i8253.c
+++ b/arch/mips/kernel/i8253.c
@@ -125,87 +125,11 @@ void __init setup_pit_timer(void)
        setup_irq(0, &irq0);
 }
 
-/*
- * Since the PIT overflows every tick, its not very useful
- * to just read by itself. So use jiffies to emulate a free
- * running counter:
- */
-static cycle_t pit_read(struct clocksource *cs)
-{
-       unsigned long flags;
-       int count;
-       u32 jifs;
-       static int old_count;
-       static u32 old_jifs;
-
-       raw_spin_lock_irqsave(&i8253_lock, flags);
-       /*
-        * Although our caller may have the read side of xtime_lock,
-        * this is now a seqlock, and we are cheating in this routine
-        * by having side effects on state that we cannot undo if
-        * there is a collision on the seqlock and our caller has to
-        * retry.  (Namely, old_jifs and old_count.)  So we must treat
-        * jiffies as volatile despite the lock.  We read jiffies
-        * before latching the timer count to guarantee that although
-        * the jiffies value might be older than the count (that is,
-        * the counter may underflow between the last point where
-        * jiffies was incremented and the point where we latch the
-        * count), it cannot be newer.
-        */
-       jifs = jiffies;
-       outb_p(0x00, PIT_MODE); /* latch the count ASAP */
-       count = inb_p(PIT_CH0); /* read the latched count */
-       count |= inb_p(PIT_CH0) << 8;
-
-       /* VIA686a test code... reset the latch if count > max + 1 */
-       if (count > LATCH) {
-               outb_p(0x34, PIT_MODE);
-               outb_p(LATCH & 0xff, PIT_CH0);
-               outb(LATCH >> 8, PIT_CH0);
-               count = LATCH - 1;
-       }
-
-       /*
-        * It's possible for count to appear to go the wrong way for a
-        * couple of reasons:
-        *
-        *  1. The timer counter underflows, but we haven't handled the
-        *     resulting interrupt and incremented jiffies yet.
-        *  2. Hardware problem with the timer, not giving us continuous time,
-        *     the counter does small "jumps" upwards on some Pentium systems,
-        *     (see c't 95/10 page 335 for Neptun bug.)
-        *
-        * Previous attempts to handle these cases intelligently were
-        * buggy, so we just do the simple thing now.
-        */
-       if (count > old_count && jifs == old_jifs) {
-               count = old_count;
-       }
-       old_count = count;
-       old_jifs = jifs;
-
-       raw_spin_unlock_irqrestore(&i8253_lock, flags);
-
-       count = (LATCH - 1) - count;
-
-       return (cycle_t)(jifs * LATCH) + count;
-}
-
-static struct clocksource clocksource_pit = {
-       .name   = "pit",
-       .rating = 110,
-       .read   = pit_read,
-       .mask   = CLOCKSOURCE_MASK(32),
-       .mult   = 0,
-       .shift  = 20,
-};
-
 static int __init init_pit_clocksource(void)
 {
        if (num_possible_cpus() > 1) /* PIT does not scale! */
                return 0;
 
-       clocksource_pit.mult = clocksource_hz2mult(CLOCK_TICK_RATE, 20);
-       return clocksource_register(&clocksource_pit);
+       return clocksource_i8253_init();
 }
 arch_initcall(init_pit_clocksource);