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author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-25 21:00:19 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-25 21:00:19 -0700 |
commit | 45b583b10a8b438b970e95a7d1d4db22c9e35004 (patch) | |
tree | 14fa481598289df0459580c582b48a9d95db51f6 /arch/um/sys-i386/delay.c | |
parent | 154dd78d30b56ffb8b447f629bfcceb14150e5c4 (diff) | |
parent | f19da2ce8ef5e49b8b8ea199c3601dd45d71b262 (diff) |
Merge 'akpm' patch series
* Merge akpm patch series: (122 commits)
drivers/connector/cn_proc.c: remove unused local
Documentation/SubmitChecklist: add RCU debug config options
reiserfs: use hweight_long()
reiserfs: use proper little-endian bitops
pnpacpi: register disabled resources
drivers/rtc/rtc-tegra.c: properly initialize spinlock
drivers/rtc/rtc-twl.c: check return value of twl_rtc_write_u8() in twl_rtc_set_time()
drivers/rtc: add support for Qualcomm PMIC8xxx RTC
drivers/rtc/rtc-s3c.c: support clock gating
drivers/rtc/rtc-mpc5121.c: add support for RTC on MPC5200
init: skip calibration delay if previously done
misc/eeprom: add eeprom access driver for digsy_mtc board
misc/eeprom: add driver for microwire 93xx46 EEPROMs
checkpatch.pl: update $logFunctions
checkpatch: make utf-8 test --strict
checkpatch.pl: add ability to ignore various messages
checkpatch: add a "prefer __aligned" check
checkpatch: validate signature styles and To: and Cc: lines
checkpatch: add __rcu as a sparse modifier
checkpatch: suggest using min_t or max_t
...
Did this as a merge because of (trivial) conflicts in
- Documentation/feature-removal-schedule.txt
- arch/xtensa/include/asm/uaccess.h
that were just easier to fix up in the merge than in the patch series.
Diffstat (limited to 'arch/um/sys-i386/delay.c')
-rw-r--r-- | arch/um/sys-i386/delay.c | 59 |
1 files changed, 45 insertions, 14 deletions
diff --git a/arch/um/sys-i386/delay.c b/arch/um/sys-i386/delay.c index d623e074f41d..f3fe1a688f7e 100644 --- a/arch/um/sys-i386/delay.c +++ b/arch/um/sys-i386/delay.c @@ -1,29 +1,60 @@ +/* + * Copyright (C) 2011 Richard Weinberger <richrd@nod.at> + * Mostly copied from arch/x86/lib/delay.c + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + #include <linux/module.h> #include <linux/kernel.h> #include <linux/delay.h> #include <asm/param.h> -void __delay(unsigned long time) +void __delay(unsigned long loops) { - /* Stolen from the i386 __loop_delay */ - int d0; - __asm__ __volatile__( - "\tjmp 1f\n" + asm volatile( + "test %0,%0\n" + "jz 3f\n" + "jmp 1f\n" + ".align 16\n" - "1:\tjmp 2f\n" + "1: jmp 2f\n" + ".align 16\n" - "2:\tdecl %0\n\tjns 2b" - :"=&a" (d0) - :"0" (time)); + "2: dec %0\n" + " jnz 2b\n" + "3: dec %0\n" + + : /* we don't need output */ + : "a" (loops) + ); } +EXPORT_SYMBOL(__delay); -void __udelay(unsigned long usecs) +inline void __const_udelay(unsigned long xloops) { - int i, n; + int d0; - n = (loops_per_jiffy * HZ * usecs) / MILLION; - for(i=0;i<n;i++) - cpu_relax(); + xloops *= 4; + asm("mull %%edx" + : "=d" (xloops), "=&a" (d0) + : "1" (xloops), "0" + (loops_per_jiffy * (HZ/4))); + + __delay(++xloops); } +EXPORT_SYMBOL(__const_udelay); +void __udelay(unsigned long usecs) +{ + __const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */ +} EXPORT_SYMBOL(__udelay); + +void __ndelay(unsigned long nsecs) +{ + __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */ +} +EXPORT_SYMBOL(__ndelay); |