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
33 static 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
nec_usb_controller_fixup(struct pci_dev * dev)42 static 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
49 DECLARE_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 */
emma2rh_pci_host_fixup(struct pci_dev * dev)57 static 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
72 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_EMMA2RH,
73 emma2rh_pci_host_fixup);
74
pcibios_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)75 int 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 */
pcibios_plat_dev_init(struct pci_dev * dev)81 int pcibios_plat_dev_init(struct pci_dev *dev)
82 {
83 return 0;
84 }
85