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      1 /*	$NetBSD: leds.c,v 1.20 2011/02/08 20:20:13 rmind Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1982, 1986, 1990, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  * from: Utah $Hdr: machdep.c 1.74 92/12/20$
     37  *
     38  *	@(#)machdep.c	8.10 (Berkeley) 4/20/94
     39  */
     40 
     41 #include <sys/cdefs.h>
     42 __KERNEL_RCSID(0, "$NetBSD: leds.c,v 1.20 2011/02/08 20:20:13 rmind Exp $");
     43 
     44 #include <sys/param.h>
     45 
     46 #include <uvm/uvm_extern.h>
     47 
     48 #include <hp300/hp300/leds.h>
     49 
     50 static vaddr_t	ledbase;	/* kva of LED page */
     51 uint8_t		*ledaddr;	/* actual address of LEDs */
     52 static volatile uint8_t currentleds; /* current LED status */
     53 
     54 /*
     55  * Map the LED page and setup the KVA to access it.
     56  */
     57 void
     58 ledinit(void)
     59 {
     60 
     61 	ledbase = uvm_km_alloc(kernel_map, PAGE_SIZE, 0, UVM_KMF_VAONLY);
     62 	pmap_enter(pmap_kernel(), ledbase, (paddr_t)LED_ADDR,
     63 	    VM_PROT_READ|VM_PROT_WRITE, VM_PROT_READ|VM_PROT_WRITE|PMAP_WIRED);
     64 	pmap_update(pmap_kernel());
     65 	ledaddr = (uint8_t *)(ledbase | (LED_ADDR & PGOFSET));
     66 }
     67 
     68 /*
     69  * Do lights:
     70  *	`ons' is a mask of LEDs to turn on,
     71  *	`offs' is a mask of LEDs to turn off,
     72  *	`togs' is a mask of LEDs to toggle.
     73  * Note that we don't use splclock/splx for mutual exclusion.  They are
     74  * expensive and we really don't need to be that precise.  Besides, we
     75  * would like to be able to profile this routine.
     76  */
     77 void
     78 ledcontrol(int ons, int offs, int togs)
     79 {
     80 
     81 	__asm volatile (
     82 		"orb	%1,%0	;\n"
     83 		"andb	%2,%0	;\n"
     84 		"eorb	%3,%0"
     85 	    : "=m" (currentleds)
     86 	    : "d" (ons), "d" (~offs), "d" (togs));
     87 	*ledaddr = ~currentleds;
     88 }
     89