1 // SPDX-License-Identifier: GPL-2.0-or-later 1
2 /*
3 * Copyright (C) 2007 Lemote, Inc. & Institute
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_resour
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_resourc
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_con
26 .pci_ops = &loongson_pci_ops,
27 .io_resource = &loongson_pci_io_res
28 .mem_resource = &loongson_pci_mem_re
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 access
37 * CPU address space [256M,448M] is wi
38 * we set pcimap_lo[0,1,2] to map it t
39 *
40 * pcimap: PCI_MAP2 PCI_Mem_Lo2 PCI_M
41 * [<2G] [384M,448M] [320M
42 */
43 LOONGSON_PCIMAP = LOONGSON_PCIMAP_PCIM
44 LOONGSON_PCIMAP_WIN(2, LOONGSO
45 LOONGSON_PCIMAP_WIN(1, LOONGSO
46 LOONGSON_PCIMAP_WIN(0, 0);
47
48 /*
49 * PCI-DMA to local mapping: [2G,2G+25
50 */
51 LOONGSON_PCIBASE0 = 0x80000000ul; /*
52 /* size: 256M, burst transmission, pre
53 LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul
54 LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful
55 LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul
56 LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul
57 LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul
58 LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul
59
60 /* avoid deadlock of PCI reading/writi
61 LOONGSON_PCI_ISR4C = 0xd2000001ul;
62
63 /* can not change gnt to break pci tra
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 add
70 */
71 LOONGSON_ADDRWIN_CPUTOPCI(ADDRWIN_WIN2
72 LOONGSON_PCI_MEM_DST, MMAP_CPU
73 #endif
74 }
75
76 static int __init pcibios_init(void)
77 {
78 setup_pcimap();
79
80 loongson_pci_controller.io_map_base =
81 register_pci_controller(&loongson_pci_
82
83
84 return 0;
85 }
86
87 arch_initcall(pcibios_init);
88
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