1 /*
2 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
3 * Author: Fuxin Zhang, zhangfx@lemote.com
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 */
10 #include <linux/pci.h>
11
12 #include <pci.h>
13 #include <loongson.h>
14
15 static struct resource loongson_pci_mem_resource = {
16 .name = "pci memory space",
17 .start = LOONGSON_PCI_MEM_START,
18 .end = LOONGSON_PCI_MEM_END,
19 .flags = IORESOURCE_MEM,
20 };
21
22 static struct resource loongson_pci_io_resource = {
23 .name = "pci io space",
24 .start = LOONGSON_PCI_IO_START,
25 .end = IO_SPACE_LIMIT,
26 .flags = IORESOURCE_IO,
27 };
28
29 static struct pci_controller loongson_pci_controller = {
30 .pci_ops = &loongson_pci_ops,
31 .io_resource = &loongson_pci_io_resource,
32 .mem_resource = &loongson_pci_mem_resource,
33 .mem_offset = 0x00000000UL,
34 .io_offset = 0x00000000UL,
35 };
36
setup_pcimap(void)37 static void __init setup_pcimap(void)
38 {
39 /*
40 * local to PCI mapping for CPU accessing PCI space
41 * CPU address space [256M,448M] is window for accessing pci space
42 * we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M]
43 *
44 * pcimap: PCI_MAP2 PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0
45 * [<2G] [384M,448M] [320M,384M] [0M,64M]
46 */
47 LOONGSON_PCIMAP = LOONGSON_PCIMAP_PCIMAP_2 |
48 LOONGSON_PCIMAP_WIN(2, LOONGSON_PCILO2_BASE) |
49 LOONGSON_PCIMAP_WIN(1, LOONGSON_PCILO1_BASE) |
50 LOONGSON_PCIMAP_WIN(0, 0);
51
52 /*
53 * PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M]
54 */
55 LOONGSON_PCIBASE0 = 0x80000000ul; /* base: 2G -> mmap: 0M */
56 /* size: 256M, burst transmission, pre-fetch enable, 64bit */
57 LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul;
58 LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful;
59 LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */
60 LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul;
61 LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */
62 LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul;
63
64 /* avoid deadlock of PCI reading/writing lock operation */
65 LOONGSON_PCI_ISR4C = 0xd2000001ul;
66
67 /* can not change gnt to break pci transfer when device's gnt not
68 deassert for some broken device */
69 LOONGSON_PXARB_CFG = 0x00fe0105ul;
70
71 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
72 /*
73 * set cpu addr window2 to map CPU address space to PCI address space
74 */
75 LOONGSON_ADDRWIN_CPUTOPCI(ADDRWIN_WIN2, LOONGSON_CPU_MEM_SRC,
76 LOONGSON_PCI_MEM_DST, MMAP_CPUTOPCI_SIZE);
77 #endif
78 }
79
pcibios_init(void)80 static int __init pcibios_init(void)
81 {
82 setup_pcimap();
83
84 loongson_pci_controller.io_map_base = mips_io_port_base;
85
86 register_pci_controller(&loongson_pci_controller);
87
88 return 0;
89 }
90
91 arch_initcall(pcibios_init);
92