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      1 /*	$NetBSD: ofwgencfg_clock.c,v 1.10 2009/03/18 10:22:24 cegger Exp $	*/
      2 
      3 /*
      4  * Copyright 1997
      5  * Digital Equipment Corporation. All rights reserved.
      6  *
      7  * This software is furnished under license and may be used and
      8  * copied only in accordance with the following terms and conditions.
      9  * Subject to these conditions, you may download, copy, install,
     10  * use, modify and distribute this software in source and/or binary
     11  * form. No title or ownership is transferred hereby.
     12  *
     13  * 1) Any source code used, modified or distributed must reproduce
     14  *    and retain this copyright notice and list of conditions as
     15  *    they appear in the source file.
     16  *
     17  * 2) No right is granted to use any trade name, trademark, or logo of
     18  *    Digital Equipment Corporation. Neither the "Digital Equipment
     19  *    Corporation" name nor any trademark or logo of Digital Equipment
     20  *    Corporation may be used to endorse or promote products derived
     21  *    from this software without the prior written permission of
     22  *    Digital Equipment Corporation.
     23  *
     24  * 3) This software is provided "AS-IS" and any express or implied
     25  *    warranties, including but not limited to, any implied warranties
     26  *    of merchantability, fitness for a particular purpose, or
     27  *    non-infringement are disclaimed. In no event shall DIGITAL be
     28  *    liable for any damages whatsoever, and in particular, DIGITAL
     29  *    shall not be liable for special, indirect, consequential, or
     30  *    incidental damages or damages for lost profits, loss of
     31  *    revenue or loss of use, whether such damages arise in contract,
     32  *    negligence, tort, under statute, in equity, at law or otherwise,
     33  *    even if advised of the possibility of such damage.
     34  */
     35 
     36 /* Include header files */
     37 
     38 #include <sys/cdefs.h>
     39 __KERNEL_RCSID(0, "$NetBSD: ofwgencfg_clock.c,v 1.10 2009/03/18 10:22:24 cegger Exp $");
     40 
     41 #include <sys/types.h>
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 #include <sys/kernel.h>
     45 #include <sys/time.h>
     46 
     47 #include <machine/intr.h>
     48 #include <machine/irqhandler.h>
     49 #include <arm/cpufunc.h>
     50 #include <machine/cpu.h>
     51 #include <machine/ofw.h>
     52 
     53 static void *clockirq;
     54 
     55 
     56 /*
     57  * int clockhandler(struct clockframe *frame)
     58  *
     59  * Function called by timer 0 interrupts. This just calls
     60  * hardclock(). Eventually the irqhandler can call hardclock() directly
     61  * but for now we use this function so that we can debug IRQ's
     62  */
     63 
     64 static int
     65 clockhandler(struct clockframe *frame)
     66 {
     67 
     68 	hardclock(frame);
     69 	return(0);	/* Pass the interrupt on down the chain */
     70 }
     71 
     72 #if 0
     73 /*
     74  * int statclockhandler(struct clockframe *frame)
     75  *
     76  * Function called by timer 1 interrupts. This just calls
     77  * statclock(). Eventually the irqhandler can call statclock() directly
     78  * but for now we use this function so that we can debug IRQ's
     79  */
     80 
     81 int
     82 statclockhandler(struct clockframe *frame)
     83 {
     84 
     85 	statclock(frame);
     86 	return(0);	/* Pass the interrupt on down the chain */
     87 }
     88 #endif
     89 
     90 /*
     91  * void setstatclockrate(int hz)
     92  *
     93  * Set the stat clock rate. The stat clock uses timer1
     94  */
     95 
     96 void
     97 setstatclockrate(int arg)
     98 {
     99 #ifdef	OFWGENCFG
    100 	printf("Not setting statclock: OFW generic has only one clock.\n");
    101 #endif
    102 }
    103 
    104 
    105 /*
    106  * void cpu_initclocks(void)
    107  *
    108  * Initialise the clocks.
    109  * This sets up the two timers in the IOMD and installs the IRQ handlers
    110  *
    111  * NOTE: Currently only timer 0 is setup and the IRQ handler is not installed
    112  */
    113 
    114 void
    115 cpu_initclocks(void)
    116 {
    117 	/*
    118 	 * Load timer 0 with count down value
    119 	 * This timer generates 100Hz interrupts for the system clock
    120 	 */
    121 
    122 	printf("clock: hz=%d stathz = %d profhz = %d\n", hz, stathz, profhz);
    123 
    124         clockirq = intr_claim(IRQ_TIMER0, IPL_CLOCK,
    125             (int (*)(void *))clockhandler, 0, "clock", "hard intr");
    126         if (clockirq == NULL)
    127                 panic("Cannot installer timer 0 IRQ handler");
    128 
    129 	/* Notify callback handler that it can start processing ticks. */
    130 	ofw_handleticks = 1;
    131 
    132 	if (stathz) {
    133 	    printf("Not installing statclock: OFW generic has only one clock.\n");
    134 	}
    135 }
    136 
    137 /*
    138  * Estimated loop for n microseconds
    139  */
    140 
    141 /* Need to re-write this to use the timers */
    142 
    143 /* One day soon I will actually do this */
    144 
    145 int delaycount = 50;
    146 
    147 void
    148 delay(u_int n)
    149 {
    150 	u_int i;
    151 
    152 	if (n == 0) return;
    153 	while (n-- > 0) {
    154 		if (cputype == CPU_ID_SA110)	/* XXX - Seriously gross hack */
    155 			for (i = delaycount; --i;);
    156 		else
    157 			for (i = 8; --i;);
    158 	}
    159 }
    160