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[MIPS] Fixup migration to GENERIC_TIME

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Since we already moved to GENERIC_TIME, we should implement alternatives
of old do_gettimeoffset routines to get sub-jiffies resolution from
gettimeofday().  This patch includes:

 * MIPS clocksource support (based on works by Manish Lachwani).
 * remove unused gettimeoffset routines and related codes.
 * remove unised 64bit do_div64_32().
 * simplify mips_hpt_init. (no argument needed, __init tag)
 * simplify c0_hpt_timer_init. (no need to write to c0_count)
 * remove some hpt_init routines.
 * mips_hpt_mask variable to specify bitmask of hpt value.
 * convert jmr3927_do_gettimeoffset to jmr3927_hpt_read.
 * convert ip27_do_gettimeoffset to ip27_hpt_read.
 * convert bcm1480_do_gettimeoffset to bcm1480_hpt_read.
 * simplify sb1250 hpt functions. (no need to subtract and shift)
    
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto
2006-10-24 00:21:27 +09:00
committed by Ralf Baechle
parent 70e46f48cb
commit 16b7b2ac01
13 changed files with 104 additions and 523 deletions
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16
arch/mips/sgi-ip27/ip27-timer.c
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@@ -134,13 +134,6 @@ again:
irq_exit();
}
unsigned long ip27_do_gettimeoffset(void)
{
unsigned long ct_cur1;
ct_cur1 = REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT) + CYCLES_PER_JIFFY;
return (ct_cur1 - ct_cur[0]) * NSEC_PER_CYCLE / 1000;
}
/* Includes for ioc3_init(). */
#include <asm/sn/types.h>
#include <asm/sn/sn0/addrs.h>
@@ -248,12 +241,17 @@ void __init plat_timer_setup(struct irqaction *irq)
setup_irq(irqno, &rt_irqaction);
}
static unsigned int ip27_hpt_read(void)
{
return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
}
void __init ip27_time_init(void)
{
mips_hpt_read = ip27_hpt_read;
mips_hpt_frequency = CYCLES_PER_SEC;
xtime.tv_sec = get_m48t35_time();
xtime.tv_nsec = 0;
do_gettimeoffset = ip27_do_gettimeoffset;
}
void __init cpu_time_init(void)