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 #include <boot_param.h>
15
16 static struct resource loongson_pci_mem_resource = {
17 .name = "pci memory space",
18 .start = LOONGSON_PCI_MEM_START,
19 .end = LOONGSON_PCI_MEM_END,
20 .flags = IORESOURCE_MEM,
21 };
22
23 static struct resource loongson_pci_io_resource = {
24 .name = "pci io space",
25 .start = LOONGSON_PCI_IO_START,
26 .end = IO_SPACE_LIMIT,
27 .flags = IORESOURCE_IO,
28 };
29
30 static struct pci_controller loongson_pci_controller = {
31 .pci_ops = &loongson_pci_ops,
32 .io_resource = &loongson_pci_io_resource,
33 .mem_resource = &loongson_pci_mem_resource,
34 .mem_offset = 0x00000000UL,
35 .io_offset = 0x00000000UL,
36 };
37
setup_pcimap(void)38 static void __init setup_pcimap(void)
39 {
40 /*
41 * local to PCI mapping for CPU accessing PCI space
42 * CPU address space [256M,448M] is window for accessing pci space
43 * we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M]
44 *
45 * pcimap: PCI_MAP2 PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0
46 * [<2G] [384M,448M] [320M,384M] [0M,64M]
47 */
48 LOONGSON_PCIMAP = LOONGSON_PCIMAP_PCIMAP_2 |
49 LOONGSON_PCIMAP_WIN(2, LOONGSON_PCILO2_BASE) |
50 LOONGSON_PCIMAP_WIN(1, LOONGSON_PCILO1_BASE) |
51 LOONGSON_PCIMAP_WIN(0, 0);
52
53 /*
54 * PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M]
55 */
56 LOONGSON_PCIBASE0 = 0x80000000ul; /* base: 2G -> mmap: 0M */
57 /* size: 256M, burst transmission, pre-fetch enable, 64bit */
58 LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul;
59 LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful;
60 LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */
61 LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul;
62 LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */
63 LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul;
64
65 /* avoid deadlock of PCI reading/writing lock operation */
66 LOONGSON_PCI_ISR4C = 0xd2000001ul;
67
68 /* can not change gnt to break pci transfer when device's gnt not
69 deassert for some broken device */
70 LOONGSON_PXARB_CFG = 0x00fe0105ul;
71
72 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
73 /*
74 * set cpu addr window2 to map CPU address space to PCI address space
75 */
76 LOONGSON_ADDRWIN_CPUTOPCI(ADDRWIN_WIN2, LOONGSON_CPU_MEM_SRC,
77 LOONGSON_PCI_MEM_DST, MMAP_CPUTOPCI_SIZE);
78 #endif
79 }
80
81 extern int sbx00_acpi_init(void);
82
pcibios_init(void)83 static int __init pcibios_init(void)
84 {
85 setup_pcimap();
86
87 loongson_pci_controller.io_map_base = mips_io_port_base;
88 #ifdef CONFIG_LEFI_FIRMWARE_INTERFACE
89 loongson_pci_mem_resource.start = loongson_sysconf.pci_mem_start_addr;
90 loongson_pci_mem_resource.end = loongson_sysconf.pci_mem_end_addr;
91 #endif
92 register_pci_controller(&loongson_pci_controller);
93
94 #ifdef CONFIG_CPU_LOONGSON3
95 sbx00_acpi_init();
96 #endif
97
98 return 0;
99 }
100
101 arch_initcall(pcibios_init);
102