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87 lines
2.5 KiB
87 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology |
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* Author: Fuxin Zhang, [email protected] |
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*/ |
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#include <linux/pci.h> |
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#include <pci.h> |
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#include <loongson.h> |
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static struct resource loongson_pci_mem_resource = { |
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.name = "pci memory space", |
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.start = LOONGSON_PCI_MEM_START, |
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.end = LOONGSON_PCI_MEM_END, |
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.flags = IORESOURCE_MEM, |
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}; |
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static struct resource loongson_pci_io_resource = { |
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.name = "pci io space", |
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.start = LOONGSON_PCI_IO_START, |
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.end = IO_SPACE_LIMIT, |
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.flags = IORESOURCE_IO, |
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}; |
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static struct pci_controller loongson_pci_controller = { |
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.pci_ops = &loongson_pci_ops, |
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.io_resource = &loongson_pci_io_resource, |
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.mem_resource = &loongson_pci_mem_resource, |
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.mem_offset = 0x00000000UL, |
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.io_offset = 0x00000000UL, |
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}; |
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static void __init setup_pcimap(void) |
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{ |
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/* |
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* local to PCI mapping for CPU accessing PCI space |
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* CPU address space [256M,448M] is window for accessing pci space |
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* we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M] |
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* |
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* pcimap: PCI_MAP2 PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0 |
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* [<2G] [384M,448M] [320M,384M] [0M,64M] |
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*/ |
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LOONGSON_PCIMAP = LOONGSON_PCIMAP_PCIMAP_2 | |
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LOONGSON_PCIMAP_WIN(2, LOONGSON_PCILO2_BASE) | |
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LOONGSON_PCIMAP_WIN(1, LOONGSON_PCILO1_BASE) | |
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LOONGSON_PCIMAP_WIN(0, 0); |
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/* |
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* PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M] |
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*/ |
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LOONGSON_PCIBASE0 = 0x80000000ul; /* base: 2G -> mmap: 0M */ |
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/* size: 256M, burst transmission, pre-fetch enable, 64bit */ |
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LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul; |
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LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful; |
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LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */ |
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LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul; |
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LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */ |
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LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul; |
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/* avoid deadlock of PCI reading/writing lock operation */ |
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LOONGSON_PCI_ISR4C = 0xd2000001ul; |
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/* can not change gnt to break pci transfer when device's gnt not |
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deassert for some broken device */ |
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LOONGSON_PXARB_CFG = 0x00fe0105ul; |
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#ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG |
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/* |
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* set cpu addr window2 to map CPU address space to PCI address space |
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*/ |
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LOONGSON_ADDRWIN_CPUTOPCI(ADDRWIN_WIN2, LOONGSON_CPU_MEM_SRC, |
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LOONGSON_PCI_MEM_DST, MMAP_CPUTOPCI_SIZE); |
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#endif |
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} |
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static int __init pcibios_init(void) |
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{ |
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setup_pcimap(); |
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loongson_pci_controller.io_map_base = mips_io_port_base; |
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register_pci_controller(&loongson_pci_controller); |
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return 0; |
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} |
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arch_initcall(pcibios_init);
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