1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
5 #include <linux/kernel.h>
6 #include <linux/export.h>
7 #include <linux/init.h>
8 #include <linux/acpi.h>
9 #include <linux/types.h>
10 #include <linux/pci.h>
11 #include <linux/vgaarb.h>
12 #include <asm/loongson.h>
14 #define PCI_DEVICE_ID_LOONGSON_HOST 0x7a00
15 #define PCI_DEVICE_ID_LOONGSON_DC1 0x7a06
16 #define PCI_DEVICE_ID_LOONGSON_DC2 0x7a36
18 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
19 int reg, int len, u32 *val)
21 struct pci_bus *bus_tmp = pci_find_bus(domain, bus);
24 return bus_tmp->ops->read(bus_tmp, devfn, reg, len, val);
28 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
29 int reg, int len, u32 val)
31 struct pci_bus *bus_tmp = pci_find_bus(domain, bus);
34 return bus_tmp->ops->write(bus_tmp, devfn, reg, len, val);
38 phys_addr_t mcfg_addr_init(int node)
40 return (((u64)node << 44) | MCFG_EXT_PCICFG_BASE);
43 static int __init pcibios_init(void)
48 * Set PCI cacheline size to that of the highest level in the
51 lsize = cpu_dcache_line_size();
52 lsize = cpu_vcache_line_size() ? : lsize;
53 lsize = cpu_scache_line_size() ? : lsize;
57 pci_dfl_cache_line_size = lsize >> 2;
59 pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize);
64 subsys_initcall(pcibios_init);
66 int pcibios_device_add(struct pci_dev *dev)
69 struct irq_domain *dom;
71 id = pci_domain_nr(dev->bus);
72 dom = irq_find_matching_fwnode(get_pch_msi_handle(id), DOMAIN_BUS_PCI_MSI);
73 dev_set_msi_domain(&dev->dev, dom);
78 int pcibios_alloc_irq(struct pci_dev *dev)
82 if (pci_dev_msi_enabled(dev))
84 return acpi_pci_irq_enable(dev);
87 static void pci_fixup_vgadev(struct pci_dev *pdev)
89 struct pci_dev *devp = NULL;
91 while ((devp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, devp))) {
92 if (devp->vendor != PCI_VENDOR_ID_LOONGSON) {
93 vga_set_default_device(devp);
95 "Overriding boot device as %X:%X\n",
96 devp->vendor, devp->device);
100 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, PCI_DEVICE_ID_LOONGSON_DC1, pci_fixup_vgadev);
101 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, PCI_DEVICE_ID_LOONGSON_DC2, pci_fixup_vgadev);