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/arch/arm/mach-ixp4xx/avila-pci.c

https://github.com/AICP/kernel_google_msm
C | 82 lines | 53 code | 10 blank | 19 comment | 4 complexity | a6cb394ebca518a4efad9ff30de6127a MD5 | raw file
 1/*
 2 * arch/arm/mach-ixp4xx/avila-pci.c
 3 *
 4 * Gateworks Avila board-level PCI initialization
 5 *
 6 * Author: Michael-Luke Jones <mlj28@cam.ac.uk>
 7 *
 8 * Based on ixdp-pci.c
 9 * Copyright (C) 2002 Intel Corporation.
10 * Copyright (C) 2003-2004 MontaVista Software, Inc.
11 *
12 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 *
18 */
19
20#include <linux/kernel.h>
21#include <linux/pci.h>
22#include <linux/init.h>
23#include <linux/irq.h>
24#include <linux/delay.h>
25#include <asm/mach/pci.h>
26#include <asm/irq.h>
27#include <mach/hardware.h>
28#include <asm/mach-types.h>
29
30#define AVILA_MAX_DEV	4
31#define LOFT_MAX_DEV	6
32#define IRQ_LINES	4
33
34/* PCI controller GPIO to IRQ pin mappings */
35#define INTA		11
36#define INTB		10
37#define INTC		9
38#define INTD		8
39
40void __init avila_pci_preinit(void)
41{
42	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
43	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
44	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
45	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
46	ixp4xx_pci_preinit();
47}
48
49static int __init avila_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
50{
51	static int pci_irq_table[IRQ_LINES] = {
52		IXP4XX_GPIO_IRQ(INTA),
53		IXP4XX_GPIO_IRQ(INTB),
54		IXP4XX_GPIO_IRQ(INTC),
55		IXP4XX_GPIO_IRQ(INTD)
56	};
57
58	if (slot >= 1 &&
59	    slot <= (machine_is_loft() ? LOFT_MAX_DEV : AVILA_MAX_DEV) &&
60	    pin >= 1 && pin <= IRQ_LINES)
61		return pci_irq_table[(slot + pin - 2) % 4];
62
63	return -1;
64}
65
66struct hw_pci avila_pci __initdata = {
67	.nr_controllers = 1,
68	.preinit	= avila_pci_preinit,
69	.swizzle	= pci_std_swizzle,
70	.setup		= ixp4xx_setup,
71	.scan		= ixp4xx_scan_bus,
72	.map_irq	= avila_map_irq,
73};
74
75int __init avila_pci_init(void)
76{
77	if (machine_is_avila() || machine_is_loft())
78		pci_common_init(&avila_pci);
79	return 0;
80}
81
82subsys_initcall(avila_pci_init);