1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * ops-vr41xx.c, PCI configuration routines for the PCIU of NEC VR4100 series.
4 *
5 * Copyright (C) 2001-2003 MontaVista Software Inc.
6 * Author: Yoichi Yuasa <source@mvista.com>
7 * Copyright (C) 2004-2005 Yoichi Yuasa <yuasa@linux-mips.org>
8 */
9 /*
10 * Changes:
11 * MontaVista Software Inc. <source@mvista.com>
12 * - New creation, NEC VR4122 and VR4131 are supported.
13 */
14 #include <linux/pci.h>
15 #include <linux/types.h>
16
17 #include <asm/io.h>
18
19 #define PCICONFDREG (void __iomem *)KSEG1ADDR(0x0f000c14)
20 #define PCICONFAREG (void __iomem *)KSEG1ADDR(0x0f000c18)
21
set_pci_configuration_address(unsigned char number,unsigned int devfn,int where)22 static inline int set_pci_configuration_address(unsigned char number,
23 unsigned int devfn, int where)
24 {
25 if (number == 0) {
26 /*
27 * Type 0 configuration
28 */
29 if (PCI_SLOT(devfn) < 11 || where > 0xff)
30 return -EINVAL;
31
32 writel((1U << PCI_SLOT(devfn)) | (PCI_FUNC(devfn) << 8) |
33 (where & 0xfc), PCICONFAREG);
34 } else {
35 /*
36 * Type 1 configuration
37 */
38 if (where > 0xff)
39 return -EINVAL;
40
41 writel(((uint32_t)number << 16) | ((devfn & 0xff) << 8) |
42 (where & 0xfc) | 1U, PCICONFAREG);
43 }
44
45 return 0;
46 }
47
pci_config_read(struct pci_bus * bus,unsigned int devfn,int where,int size,uint32_t * val)48 static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
49 int size, uint32_t *val)
50 {
51 uint32_t data;
52
53 *val = 0xffffffffU;
54 if (set_pci_configuration_address(bus->number, devfn, where) < 0)
55 return PCIBIOS_DEVICE_NOT_FOUND;
56
57 data = readl(PCICONFDREG);
58
59 switch (size) {
60 case 1:
61 *val = (data >> ((where & 3) << 3)) & 0xffU;
62 break;
63 case 2:
64 *val = (data >> ((where & 2) << 3)) & 0xffffU;
65 break;
66 case 4:
67 *val = data;
68 break;
69 default:
70 return PCIBIOS_FUNC_NOT_SUPPORTED;
71 }
72
73 return PCIBIOS_SUCCESSFUL;
74 }
75
pci_config_write(struct pci_bus * bus,unsigned int devfn,int where,int size,uint32_t val)76 static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
77 int size, uint32_t val)
78 {
79 uint32_t data;
80 int shift;
81
82 if (set_pci_configuration_address(bus->number, devfn, where) < 0)
83 return PCIBIOS_DEVICE_NOT_FOUND;
84
85 data = readl(PCICONFDREG);
86
87 switch (size) {
88 case 1:
89 shift = (where & 3) << 3;
90 data &= ~(0xffU << shift);
91 data |= ((val & 0xffU) << shift);
92 break;
93 case 2:
94 shift = (where & 2) << 3;
95 data &= ~(0xffffU << shift);
96 data |= ((val & 0xffffU) << shift);
97 break;
98 case 4:
99 data = val;
100 break;
101 default:
102 return PCIBIOS_FUNC_NOT_SUPPORTED;
103 }
104
105 writel(data, PCICONFDREG);
106
107 return PCIBIOS_SUCCESSFUL;
108 }
109
110 struct pci_ops vr41xx_pci_ops = {
111 .read = pci_config_read,
112 .write = pci_config_write,
113 };
114