v4.19.13 snapshot.
diff --git a/arch/mips/loongson64/common/pci.c b/arch/mips/loongson64/common/pci.c
new file mode 100644
index 0000000..4e25756
--- /dev/null
+++ b/arch/mips/loongson64/common/pci.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
+ * Author: Fuxin Zhang, zhangfx@lemote.com
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+#include <linux/pci.h>
+
+#include <pci.h>
+#include <loongson.h>
+#include <boot_param.h>
+
+static struct resource loongson_pci_mem_resource = {
+ .name = "pci memory space",
+ .start = LOONGSON_PCI_MEM_START,
+ .end = LOONGSON_PCI_MEM_END,
+ .flags = IORESOURCE_MEM,
+};
+
+static struct resource loongson_pci_io_resource = {
+ .name = "pci io space",
+ .start = LOONGSON_PCI_IO_START,
+ .end = IO_SPACE_LIMIT,
+ .flags = IORESOURCE_IO,
+};
+
+static struct pci_controller loongson_pci_controller = {
+ .pci_ops = &loongson_pci_ops,
+ .io_resource = &loongson_pci_io_resource,
+ .mem_resource = &loongson_pci_mem_resource,
+ .mem_offset = 0x00000000UL,
+ .io_offset = 0x00000000UL,
+};
+
+static void __init setup_pcimap(void)
+{
+ /*
+ * local to PCI mapping for CPU accessing PCI space
+ * CPU address space [256M,448M] is window for accessing pci space
+ * we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M]
+ *
+ * pcimap: PCI_MAP2 PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0
+ * [<2G] [384M,448M] [320M,384M] [0M,64M]
+ */
+ LOONGSON_PCIMAP = LOONGSON_PCIMAP_PCIMAP_2 |
+ LOONGSON_PCIMAP_WIN(2, LOONGSON_PCILO2_BASE) |
+ LOONGSON_PCIMAP_WIN(1, LOONGSON_PCILO1_BASE) |
+ LOONGSON_PCIMAP_WIN(0, 0);
+
+ /*
+ * PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M]
+ */
+ LOONGSON_PCIBASE0 = 0x80000000ul; /* base: 2G -> mmap: 0M */
+ /* size: 256M, burst transmission, pre-fetch enable, 64bit */
+ LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul;
+ LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful;
+ LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */
+ LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul;
+ LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */
+ LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul;
+
+ /* avoid deadlock of PCI reading/writing lock operation */
+ LOONGSON_PCI_ISR4C = 0xd2000001ul;
+
+ /* can not change gnt to break pci transfer when device's gnt not
+ deassert for some broken device */
+ LOONGSON_PXARB_CFG = 0x00fe0105ul;
+
+#ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
+ /*
+ * set cpu addr window2 to map CPU address space to PCI address space
+ */
+ LOONGSON_ADDRWIN_CPUTOPCI(ADDRWIN_WIN2, LOONGSON_CPU_MEM_SRC,
+ LOONGSON_PCI_MEM_DST, MMAP_CPUTOPCI_SIZE);
+#endif
+}
+
+extern int sbx00_acpi_init(void);
+
+static int __init pcibios_init(void)
+{
+ setup_pcimap();
+
+ loongson_pci_controller.io_map_base = mips_io_port_base;
+#ifdef CONFIG_LEFI_FIRMWARE_INTERFACE
+ loongson_pci_mem_resource.start = loongson_sysconf.pci_mem_start_addr;
+ loongson_pci_mem_resource.end = loongson_sysconf.pci_mem_end_addr;
+#endif
+ register_pci_controller(&loongson_pci_controller);
+
+#ifdef CONFIG_CPU_LOONGSON3
+ sbx00_acpi_init();
+#endif
+
+ return 0;
+}
+
+arch_initcall(pcibios_init);