i80200_irq.S revision 1.17 
1/*	$NetBSD: i80200_irq.S,v 1.17 2013/08/18 06:28:18 matt 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#include "assym.h"
39#include "opt_perfctrs.h"
40
41#include <arm/asm.h>
42#include <arm/locore.h>
43
44#include <arm/xscale/i80200reg.h>
45
46/*
47 * irq_entry:
48 *
49 *	Main entry point for the IRQ vector on i80200 CPUs.  Calls
50 *	board-specific external interrupt dispatch routine.
51 */
52
53	.text
54	.align	0
55
56.Lintr_dispatch:
57	.word	_C_LABEL(i80200_extirq_dispatch)
58
59#if defined(PERFCTRS)
60.Lpmc_dispatch:
61	.word	_C_LABEL(xscale_pmc_dispatch)
62#endif
63
64LOCK_CAS_CHECK_LOCALS
65
66AST_ALIGNMENT_FAULT_LOCALS
67
68ASENTRY_NP(irq_entry)
69	sub	lr, lr, #0x00000004	/* Adjust the lr */
70
71	PUSHFRAMEINSVC			/* Push an interrupt frame */
72	ENABLE_ALIGNMENT_FAULTS
73
74	/*
75	 * Note that we have entered the IRQ handler.  We are
76	 * in SVC mode so we cannot use the processor mode to
77	 * determine if we are in an IRQ.  Instead, we will
78	 * count each time the interrupt handler is nested.
79	 */
80	ldr	r1, [r4, #CI_INTR_DEPTH]
81	add	r1, r1, #1
82	str	r1, [r4, #CI_INTR_DEPTH]
83
84	/*
85	 * Get the interrupt status into a callee-save register.
86	 */
87	mrc	p13, 0, r5, c4, c0, 0
88
89#if defined(PERFCTRS)
90	/*
91	 * Check for PMU interrupts.
92	 * If we have one, call the routine to handle it.
93	 */
94	tst	r5, #(INTSRC_PI)
95	beq	.Lpmc_intr_return
96	mov	r1, r5
97	mov	r0, sp
98	mov	lr, pc
99	ldr	pc, .Lpmc_dispatch
100.Lpmc_intr_return:
101#endif
102
103	/*
104	 * XXX - any need to handle BMU interrupts?
105	 */
106
107	/*
108	 * Check for external IRQs.  If we have one, call the
109	 * external IRQ dispatcher.  The argument is a pointer
110	 * to the stack frame.  This function will be called with
111	 * interrupts disabled, and will return with interrupts
112	 * disabled.
113	 */
114	tst	r5, #(INTSRC_II)
115	beq	.Lextirq_return		/* no external IRQ pending */
116	ldr	r1, .Lintr_dispatch
117	mov	r0, sp
118	mov	lr, pc
119	ldr	pc, [r1]
120.Lextirq_return:
121
122	/* Decremement the nest count. */
123	ldr	r1, [r4, #CI_INTR_DEPTH]
124	sub	r1, r1, #1
125	str	r1, [r4, #CI_INTR_DEPTH]
126
127	LOCK_CAS_CHECK
128
129	DO_AST_AND_RESTORE_ALIGNMENT_FAULTS
130	PULLFRAMEFROMSVCANDEXIT
131	movs	pc, lr			/* Exit */
132