1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 *  Copyright (C) NEC Electronics Corporation 2004-2006
 4 *
 5 *  This file is based on the arch/mips/ddb5xxx/ddb5477/pci.c
 6 *
 7 *	Copyright 2001 MontaVista Software Inc.
 8 */
 9
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <linux/types.h>
13#include <linux/pci.h>
14
15#include <asm/bootinfo.h>
16
17#include <asm/emma/emma2rh.h>
18
19#define EMMA2RH_PCI_HOST_SLOT 0x09
20#define EMMA2RH_USB_SLOT 0x03
21#define PCI_DEVICE_ID_NEC_EMMA2RH      0x014b /* EMMA2RH PCI Host */
22
23/*
24 * we fix up irqs based on the slot number.
25 * The first entry is at AD:11.
26 * Fortunately this works because, although we have two pci buses,
27 * they all have different slot numbers (except for rockhopper slot 20
28 * which is handled below).
29 *
30 */
31
32#define MAX_SLOT_NUM 10
33static unsigned char irq_map[][5] = {
34	[3] = {0, MARKEINS_PCI_IRQ_INTB, MARKEINS_PCI_IRQ_INTC,
35	       MARKEINS_PCI_IRQ_INTD, 0,},
36	[4] = {0, MARKEINS_PCI_IRQ_INTA, 0, 0, 0,},
37	[5] = {0, 0, 0, 0, 0,},
38	[6] = {0, MARKEINS_PCI_IRQ_INTC, MARKEINS_PCI_IRQ_INTD,
39	       MARKEINS_PCI_IRQ_INTA, MARKEINS_PCI_IRQ_INTB,},
40};
41
42static void nec_usb_controller_fixup(struct pci_dev *dev)
43{
44	if (PCI_SLOT(dev->devfn) == EMMA2RH_USB_SLOT)
45		/* on board USB controller configuration */
46		pci_write_config_dword(dev, 0xe4, 1 << 5);
47}
48
49DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
50			nec_usb_controller_fixup);
51
52/*
53 * Prevent the PCI layer from seeing the resources allocated to this device
54 * if it is the host bridge by marking it as such.  These resources are of
55 * no consequence to the PCI layer (they are handled elsewhere).
56 */
57static void emma2rh_pci_host_fixup(struct pci_dev *dev)
58{
59	int i;
60
61	if (PCI_SLOT(dev->devfn) == EMMA2RH_PCI_HOST_SLOT) {
62		dev->class &= 0xff;
63		dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
64		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
65			dev->resource[i].start = 0;
66			dev->resource[i].end = 0;
67			dev->resource[i].flags = 0;
68		}
69	}
70}
71
72DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_EMMA2RH,
73			 emma2rh_pci_host_fixup);
74
75int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
76{
77	return irq_map[slot][pin];
78}
79
80/* Do platform specific device initialization at pci_enable_device() time */
81int pcibios_plat_dev_init(struct pci_dev *dev)
82{
83	return 0;
84}