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 15static 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 22static 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 29static 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 37static 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 80static 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 91arch_initcall(pcibios_init); 92