/* $NetBSD: clock.c,v 1.2 2010/03/02 21:52:32 matt Exp $ */ /* * Copyright (C) 1995, 1996 Wolfgang Solfrank. * Copyright (C) 1995, 1996 TooLs GmbH. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by TooLs GmbH. * 4. The name of TooLs GmbH may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include <lib/libsa/stand.h> #include <dev/isa/isareg.h> #include <dev/ic/i8253reg.h> #include <powerpc/spr.h> #include <powerpc/oea/spr.h> #include "boot.h" u_long ns_per_tick = NS_PER_TICK; static inline u_quad_t mftb(void); static inline void mfrtc(u_long *, u_long *); static inline u_quad_t mftb(void) { u_long scratch; u_quad_t tb; __asm volatile ("1: mftbu %0; mftb %0+1; mftbu %1; cmpw %0,%1; bne 1b" : "=r"(tb), "=r"(scratch)); return (tb); } static inline void mfrtc(u_long *up, u_long *lp) { u_long scratch; __asm volatile ("1: mfspr %0,%3; mfspr %1,%4; mfspr %2,%3;" "cmpw %0,%2; bne 1b" : "=r"(*up), "=r"(*lp), "=r"(scratch) : "n"(SPR_RTCU_R), "n"(SPR_RTCL_R)); } /* * Wait for about n microseconds (at least!). */ void delay(u_int n) { u_quad_t tb; u_long tbh, tbl, scratch; unsigned int cpuvers; __asm volatile ("mfpvr %0" : "=r"(cpuvers)); cpuvers >>= 16; /*cpuvers = MPC601; for now */ if (cpuvers == MPC601) { mfrtc(&tbh, &tbl); while (n >= 1000000) { tbh++; n -= 1000000; } tbl += n * 1000; if (tbl >= 1000000000) { tbh++; tbl -= 1000000000; } __asm volatile ("1: mfspr %0,%3; cmplw %0,%1; blt 1b; bgt 2f;" "mfspr %0,%4; cmplw %0,%2; blt 1b; 2:" : "=&r"(scratch) : "r"(tbh), "r"(tbl), "n"(SPR_RTCU_R), "n"(SPR_RTCL_R)); } else { tb = mftb(); tb += (n * 1000 + ns_per_tick - 1) / ns_per_tick; tbh = tb >> 32; tbl = tb; __asm volatile ("1: mftbu %0; cmpw %0,%1; blt 1b; bgt 2f;" "mftb %0; cmpw %0,%2; blt 1b; 2:" : "=&r"(scratch) : "r"(tbh), "r"(tbl)); } }