1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * arch/arm/mach-ixp4xx/miccpt-pci.c
4 *
5 * MICCPT board-level PCI initialization
6 *
7 * Copyright (C) 2002 Intel Corporation.
8 * Copyright (C) 2003-2004 MontaVista Software, Inc.
9 * Copyright (C) 2006 OMICRON electronics GmbH
10 *
11 * Author: Michael Jochum <michael.jochum@omicron.at>
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/pci.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
18 #include <linux/irq.h>
19 #include <asm/mach/pci.h>
20 #include <asm/irq.h>
21 #include <mach/hardware.h>
22 #include <asm/mach-types.h>
23
24 #include "irqs.h"
25
26 #define MAX_DEV 4
27 #define IRQ_LINES 4
28
29 /* PCI controller GPIO to IRQ pin mappings */
30 #define INTA 1
31 #define INTB 2
32 #define INTC 3
33 #define INTD 4
34
35
miccpt_pci_preinit(void)36 void __init miccpt_pci_preinit(void)
37 {
38 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
39 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
40 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
41 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
42 ixp4xx_pci_preinit();
43 }
44
miccpt_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)45 static int __init miccpt_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
46 {
47 static int pci_irq_table[IRQ_LINES] = {
48 IXP4XX_GPIO_IRQ(INTA),
49 IXP4XX_GPIO_IRQ(INTB),
50 IXP4XX_GPIO_IRQ(INTC),
51 IXP4XX_GPIO_IRQ(INTD)
52 };
53
54 if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
55 return pci_irq_table[(slot + pin - 2) % 4];
56
57 return -1;
58 }
59
60 struct hw_pci miccpt_pci __initdata = {
61 .nr_controllers = 1,
62 .ops = &ixp4xx_ops,
63 .preinit = miccpt_pci_preinit,
64 .setup = ixp4xx_setup,
65 .map_irq = miccpt_map_irq,
66 };
67
miccpt_pci_init(void)68 int __init miccpt_pci_init(void)
69 {
70 if (machine_is_miccpt())
71 pci_common_init(&miccpt_pci);
72 return 0;
73 }
74
75 subsys_initcall(miccpt_pci_init);
76