1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
4 * Author: Fuxin Zhang, zhangfx@lemote.com
5 */
6 #include <linux/pci.h>
7
8 #include <pci.h>
9 #include <loongson.h>
10
11 static struct resource loongson_pci_mem_resource = {
12 .name = "pci memory space",
13 .start = LOONGSON_PCI_MEM_START,
14 .end = LOONGSON_PCI_MEM_END,
15 .flags = IORESOURCE_MEM,
16 };
17
18 static struct resource loongson_pci_io_resource = {
19 .name = "pci io space",
20 .start = LOONGSON_PCI_IO_START,
21 .end = IO_SPACE_LIMIT,
22 .flags = IORESOURCE_IO,
23 };
24
25 static struct pci_controller loongson_pci_controller = {
26 .pci_ops = &loongson_pci_ops,
27 .io_resource = &loongson_pci_io_resource,
28 .mem_resource = &loongson_pci_mem_resource,
29 .mem_offset = 0x00000000UL,
30 .io_offset = 0x00000000UL,
31 };
32
33 static void __init setup_pcimap(void)
34 {
35 /*
36 * local to PCI mapping for CPU accessing PCI space
37 * CPU address space [256M,448M] is window for accessing pci space
38 * we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M]
39 *
40 * pcimap: PCI_MAP2 PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0
41 * [<2G] [384M,448M] [320M,384M] [0M,64M]
42 */
43 LOONGSON_PCIMAP = LOONGSON_PCIMAP_PCIMAP_2 |
44 LOONGSON_PCIMAP_WIN(2, LOONGSON_PCILO2_BASE) |
45 LOONGSON_PCIMAP_WIN(1, LOONGSON_PCILO1_BASE) |
46 LOONGSON_PCIMAP_WIN(0, 0);
47
48 /*
49 * PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M]
50 */
51 LOONGSON_PCIBASE0 = 0x80000000ul; /* base: 2G -> mmap: 0M */
52 /* size: 256M, burst transmission, pre-fetch enable, 64bit */
53 LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul;
54 LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful;
55 LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */
56 LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul;
57 LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */
58 LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul;
59
60 /* avoid deadlock of PCI reading/writing lock operation */
61 LOONGSON_PCI_ISR4C = 0xd2000001ul;
62
63 /* can not change gnt to break pci transfer when device's gnt not
64 deassert for some broken device */
65 LOONGSON_PXARB_CFG = 0x00fe0105ul;
66
67 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
68 /*
69 * set cpu addr window2 to map CPU address space to PCI address space
70 */
71 LOONGSON_ADDRWIN_CPUTOPCI(ADDRWIN_WIN2, LOONGSON_CPU_MEM_SRC,
72 LOONGSON_PCI_MEM_DST, MMAP_CPUTOPCI_SIZE);
73 #endif
74 }
75
76 static int __init pcibios_init(void)
77 {
78 setup_pcimap();
79
80 loongson_pci_controller.io_map_base = mips_io_port_base;
81 register_pci_controller(&loongson_pci_controller);
82
83
84 return 0;
85 }
86
87 arch_initcall(pcibios_init);
88
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.