| /* MN10300 Short delay interpolation routines |
| * |
| * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| * Written by David Howells (dhowells@redhat.com) |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public Licence |
| * as published by the Free Software Foundation; either version |
| * 2 of the Licence, or (at your option) any later version. |
| */ |
| #include <linux/module.h> |
| #include <linux/sched.h> |
| #include <linux/delay.h> |
| #include <asm/div64.h> |
| |
| /* |
| * basic delay loop |
| */ |
| void __delay(unsigned long loops) |
| { |
| int d0; |
| |
| asm volatile( |
| " bra 1f \n" |
| " .align 4 \n" |
| "1: bra 2f \n" |
| " .align 4 \n" |
| "2: add -1,%0 \n" |
| " bne 2b \n" |
| : "=&d" (d0) |
| : "0" (loops) |
| : "cc"); |
| } |
| EXPORT_SYMBOL(__delay); |
| |
| /* |
| * handle a delay specified in terms of microseconds |
| */ |
| void __udelay(unsigned long usecs) |
| { |
| unsigned long start, stop, cnt; |
| |
| /* usecs * CLK / 1E6 */ |
| stop = __muldiv64u(usecs, MN10300_TSCCLK, 1000000); |
| start = TMTSCBC; |
| |
| do { |
| cnt = start - TMTSCBC; |
| } while (cnt < stop); |
| } |
| EXPORT_SYMBOL(__udelay); |
