1/* arch/arm/include/asm/entry-macro-vic2.S
2 *
3 * Originally arch/arm/mach-s3c6400/include/mach/entry-macro.S
4 *
5 * Copyright 2008 Openmoko, Inc.
6 * Copyright 2008 Simtec Electronics
7 *	http://armlinux.simtec.co.uk/
8 *	Ben Dooks <ben@simtec.co.uk>
9 *
10 * Low-level IRQ helper macros for a device with two VICs
11 *
12 * This file is licensed under  the terms of the GNU General Public
13 * License version 2. This program is licensed "as is" without any
14 * warranty of any kind, whether express or implied.
15*/
16
17/* This should be included from <mach/entry-macro.S> with the necessary
18 * defines for virtual addresses and IRQ bases for the two vics.
19 *
20 * The code needs the following defined:
21 *	IRQ_VIC0_BASE	IRQ number of VIC0's first IRQ
22 *	IRQ_VIC1_BASE	IRQ number of VIC1's first IRQ
23 *	VA_VIC0		Virtual address of VIC0
24 *	VA_VIC1		Virtual address of VIC1
25 *
26 * Note, code assumes VIC0's virtual address is an ARM immediate constant
27 * away from VIC1.
28*/
29
30#include <asm/hardware/vic.h>
31
32	.macro	disable_fiq
33	.endm
34
35	.macro	get_irqnr_preamble, base, tmp
36	ldr	\base, =VA_VIC0
37	.endm
38
39	.macro	arch_ret_to_user, tmp1, tmp2
40	.endm
41
42	.macro	get_irqnr_and_base, irqnr, irqstat, base, tmp
43
44	@ check the vic0
45	mov	\irqnr, #IRQ_VIC0_BASE + 31
46	ldr	\irqstat, [ \base, # VIC_IRQ_STATUS ]
47	teq	\irqstat, #0
48
49	@ otherwise try vic1
50	addeq	\tmp, \base, #(VA_VIC1 - VA_VIC0)
51	addeq	\irqnr, \irqnr, #(IRQ_VIC1_BASE - IRQ_VIC0_BASE)
52	ldreq	\irqstat, [ \tmp, # VIC_IRQ_STATUS ]
53	teqeq	\irqstat, #0
54
55	clzne	\irqstat, \irqstat
56	subne	\irqnr, \irqnr, \irqstat
57	.endm
58