1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
4 * Author: Fuxin Zhang, zhangfx@lemote.com
10 #include <boot_param.h>
12 static struct resource loongson_pci_mem_resource = {
13 .name = "pci memory space",
14 .start = LOONGSON_PCI_MEM_START,
15 .end = LOONGSON_PCI_MEM_END,
16 .flags = IORESOURCE_MEM,
19 static struct resource loongson_pci_io_resource = {
20 .name = "pci io space",
21 .start = LOONGSON_PCI_IO_START,
22 .end = IO_SPACE_LIMIT,
23 .flags = IORESOURCE_IO,
26 static struct pci_controller loongson_pci_controller = {
27 .pci_ops = &loongson_pci_ops,
28 .io_resource = &loongson_pci_io_resource,
29 .mem_resource = &loongson_pci_mem_resource,
30 .mem_offset = 0x00000000UL,
31 .io_offset = 0x00000000UL,
34 static void __init setup_pcimap(void)
37 * local to PCI mapping for CPU accessing PCI space
38 * CPU address space [256M,448M] is window for accessing pci space
39 * we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M]
41 * pcimap: PCI_MAP2 PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0
42 * [<2G] [384M,448M] [320M,384M] [0M,64M]
44 LOONGSON_PCIMAP = LOONGSON_PCIMAP_PCIMAP_2 |
45 LOONGSON_PCIMAP_WIN(2, LOONGSON_PCILO2_BASE) |
46 LOONGSON_PCIMAP_WIN(1, LOONGSON_PCILO1_BASE) |
47 LOONGSON_PCIMAP_WIN(0, 0);
50 * PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M]
52 LOONGSON_PCIBASE0 = 0x80000000ul; /* base: 2G -> mmap: 0M */
53 /* size: 256M, burst transmission, pre-fetch enable, 64bit */
54 LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul;
55 LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful;
56 LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */
57 LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul;
58 LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */
59 LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul;
61 /* avoid deadlock of PCI reading/writing lock operation */
62 LOONGSON_PCI_ISR4C = 0xd2000001ul;
64 /* can not change gnt to break pci transfer when device's gnt not
65 deassert for some broken device */
66 LOONGSON_PXARB_CFG = 0x00fe0105ul;
68 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
70 * set cpu addr window2 to map CPU address space to PCI address space
72 LOONGSON_ADDRWIN_CPUTOPCI(ADDRWIN_WIN2, LOONGSON_CPU_MEM_SRC,
73 LOONGSON_PCI_MEM_DST, MMAP_CPUTOPCI_SIZE);
77 extern int sbx00_acpi_init(void);
79 static int __init pcibios_init(void)
83 loongson_pci_controller.io_map_base = mips_io_port_base;
84 #ifdef CONFIG_LEFI_FIRMWARE_INTERFACE
85 loongson_pci_mem_resource.start = loongson_sysconf.pci_mem_start_addr;
86 loongson_pci_mem_resource.end = loongson_sysconf.pci_mem_end_addr;
88 register_pci_controller(&loongson_pci_controller);
90 #ifdef CONFIG_CPU_LOONGSON3
97 arch_initcall(pcibios_init);