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i80200_icu.c revision 1.5 
      1 /*	$NetBSD: i80200_icu.c,v 1.5 2002/06/25 19:39:51 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2002 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed for the NetBSD Project by
     20  *	Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 /*
     39  * Intel i80200 Interrupt Controller Unit support.
     40  */
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 
     45 #include <arm/cpufunc.h>
     46 
     47 #include <arm/xscale/i80200reg.h>
     48 #include <arm/xscale/i80200var.h>
     49 
     50 /* Software shadow copy of INTCTL. */
     51 static __volatile uint32_t intctl;
     52 
     53 /* Pointer to board-specific external IRQ dispatcher. */
     54 void	(*i80200_extirq_dispatch)(struct clockframe *);
     55 
     56 static void
     57 i80200_default_extirq_dispatch(struct clockframe *framep)
     58 {
     59 
     60 	panic("external IRQ with no dispatch routine");
     61 }
     62 
     63 /*
     64  * i80200_icu_init:
     65  *
     66  *	Initialize the i80200 ICU.
     67  */
     68 void
     69 i80200_icu_init(void)
     70 {
     71 
     72 	/* Disable all interrupt sources. */
     73 	intctl = 0;
     74 	__asm __volatile("mcr p13, 0, %0, c0, c0"
     75 		:
     76 		: "r" (intctl));
     77 
     78 	/* Steer PMU and BMU to IRQ. */
     79 	__asm __volatile("mcr p13, 0, %0, c8, c0"
     80 		:
     81 		: "r" (0));
     82 
     83 	i80200_extirq_dispatch = i80200_default_extirq_dispatch;
     84 }
     85 
     86 /*
     87  * i80200_intr_enable:
     88  *
     89  *	Enable an interrupt source in the i80200 ICU.
     90  */
     91 void
     92 i80200_intr_enable(uint32_t intr)
     93 {
     94 	u_int oldirqstate;
     95 
     96 	oldirqstate = disable_interrupts(I32_bit|F32_bit);
     97 
     98 	intctl |= intr;
     99 	__asm __volatile("mcr p13, 0, %0, c0, c0"
    100 		:
    101 		: "r" (intctl));
    102 
    103 	restore_interrupts(oldirqstate);
    104 }
    105 
    106 /*
    107  * i80200_intr_disable:
    108  *
    109  *	Disable an interrupt source in the i80200 ICU.
    110  */
    111 void
    112 i80200_intr_disable(uint32_t intr)
    113 {
    114 	u_int oldirqstate;
    115 
    116 	oldirqstate = disable_interrupts(I32_bit|F32_bit);
    117 
    118 	intctl &= ~intr;
    119 	__asm __volatile("mcr p13, 0, %0, c0, c0"
    120 		:
    121 		: "r" (intctl));
    122 
    123 	restore_interrupts(oldirqstate);
    124 }
    125