1 /* $NetBSD: i80200_icu.c,v 1.10 2012/08/02 15:56:07 skrll 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/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: i80200_icu.c,v 1.10 2012/08/02 15:56:07 skrll Exp $");
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47
48 #include <arm/cpufunc.h>
49
50 #include <arm/xscale/i80200reg.h>
51 #include <arm/xscale/i80200var.h>
52
53 /* Software shadow copy of INTCTL. */
54 static volatile uint32_t intctl;
55
56 /* Pointer to board-specific external IRQ dispatcher. */
57 void (*i80200_extirq_dispatch)(struct trapframe *);
58
59 static void
i80200_default_extirq_dispatch(struct trapframe * framep)60 i80200_default_extirq_dispatch(struct trapframe *framep)
61 {
62
63 panic("external IRQ with no dispatch routine");
64 }
65
66 /*
67 * i80200_icu_init:
68 *
69 * Initialize the i80200 ICU.
70 */
71 void
i80200_icu_init(void)72 i80200_icu_init(void)
73 {
74
75 /* Disable all interrupt sources. */
76 intctl = 0;
77 __asm volatile("mcr p13, 0, %0, c0, c0"
78 :
79 : "r" (intctl));
80
81 /* Steer PMU and BMU to IRQ. */
82 __asm volatile("mcr p13, 0, %0, c8, c0"
83 :
84 : "r" (0));
85
86 i80200_extirq_dispatch = i80200_default_extirq_dispatch;
87 }
88
89 /*
90 * i80200_intr_enable:
91 *
92 * Enable an interrupt source in the i80200 ICU.
93 */
94 void
i80200_intr_enable(uint32_t intr)95 i80200_intr_enable(uint32_t intr)
96 {
97 u_int oldirqstate;
98
99 oldirqstate = disable_interrupts(I32_bit|F32_bit);
100
101 intctl |= intr;
102 __asm volatile("mcr p13, 0, %0, c0, c0"
103 :
104 : "r" (intctl));
105
106 restore_interrupts(oldirqstate);
107 }
108
109 /*
110 * i80200_intr_disable:
111 *
112 * Disable an interrupt source in the i80200 ICU.
113 */
114 void
i80200_intr_disable(uint32_t intr)115 i80200_intr_disable(uint32_t intr)
116 {
117 u_int oldirqstate;
118
119 oldirqstate = disable_interrupts(I32_bit|F32_bit);
120
121 intctl &= ~intr;
122 __asm volatile("mcr p13, 0, %0, c0, c0"
123 :
124 : "r" (intctl));
125
126 restore_interrupts(oldirqstate);
127 }
128