1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology 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_resource = { 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_resource = { 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_controller = { 26 .pci_ops = &loongson_pci_ops, 27 .io_resource = &loongson_pci_io_resource, 28 .mem_resource = &loongson_pci_mem_resource, 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 accessing PCI space 37 * CPU address space [256M,448M] is window for accessing pci space 38 * we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M] 39 * 40 * pcimap: PCI_MAP2 PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0 41 * [<2G] [384M,448M] [320M,384M] [0M,64M] 42 */ 43 LOONGSON_PCIMAP = LOONGSON_PCIMAP_PCIMAP_2 | 44 LOONGSON_PCIMAP_WIN(2, LOONGSON_PCILO2_BASE) | 45 LOONGSON_PCIMAP_WIN(1, LOONGSON_PCILO1_BASE) | 46 LOONGSON_PCIMAP_WIN(0, 0); 47 48 /* 49 * PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M] 50 */ 51 LOONGSON_PCIBASE0 = 0x80000000ul; /* base: 2G -> mmap: 0M */ 52 /* size: 256M, burst transmission, pre-fetch enable, 64bit */ 53 LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul; 54 LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful; 55 LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */ 56 LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul; 57 LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */ 58 LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul; 59 60 /* avoid deadlock of PCI reading/writing lock operation */ 61 LOONGSON_PCI_ISR4C = 0xd2000001ul; 62 63 /* can not change gnt to break pci transfer when device's gnt not 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 address space to PCI address space 70 */ 71 LOONGSON_ADDRWIN_CPUTOPCI(ADDRWIN_WIN2, LOONGSON_CPU_MEM_SRC, 72 LOONGSON_PCI_MEM_DST, MMAP_CPUTOPCI_SIZE); 73 #endif 74 } 75 76 extern int sbx00_acpi_init(void); 77 78 static int __init pcibios_init(void) 79 { 80 setup_pcimap(); 81 82 loongson_pci_controller.io_map_base = mips_io_port_base; 83 register_pci_controller(&loongson_pci_controller); 84 85 86 return 0; 87 } 88 89 arch_initcall(pcibios_init); 90