1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2020 Loongson Technology Co., Ltd.
4 */
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/cacheflush.h>
13 #include <loongson.h>
14
15 #define PCI_DEVICE_ID_LOONGSON_HOSTBRIDGE 0x7a00
16
raw_pci_read(unsigned int domain,unsigned int bus,unsigned int devfn,int reg,int len,u32 * val)17 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,int reg, int len, u32 *val)
18 {
19 struct pci_bus * bus_tmp = pci_find_bus(domain, bus);
20 if (bus_tmp)
21 return bus_tmp->ops->read(bus_tmp, devfn, reg, len, val);
22 return -EINVAL;
23 }
24
raw_pci_write(unsigned int domain,unsigned int bus,unsigned int devfn,int reg,int len,u32 val)25 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
26 int reg, int len, u32 val)
27 {
28 struct pci_bus * bus_tmp = pci_find_bus(domain, bus);
29 if (bus_tmp)
30 return bus_tmp->ops->write(bus_tmp, devfn, reg, len, val);
31 return -EINVAL;
32 }
33
mcfg_addr_init(int node)34 phys_addr_t mcfg_addr_init(int node)
35 {
36 return (((u64)node << 44) | MCFG_EXT_PCICFG_BASE);
37 }
38
pcibios_init(void)39 static int __init pcibios_init(void)
40 {
41 unsigned int lsize;
42
43 /*
44 * Set PCI cacheline size to that of the last level in the
45 * cache hierarchy.
46 */
47 lsize = cpu_last_level_cache_line_size();
48
49 BUG_ON(!lsize);
50
51 pci_dfl_cache_line_size = lsize >> 2;
52
53 pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize);
54
55 return 0;
56 }
57
58 subsys_initcall(pcibios_init);
59
pcibios_add_device(struct pci_dev * dev)60 int pcibios_add_device(struct pci_dev *dev)
61 {
62 int id = pci_domain_nr(dev->bus);
63
64 dev_set_msi_domain(&dev->dev, pch_msi_domain[id]);
65
66 return 0;
67 }
68
pcibios_alloc_irq(struct pci_dev * dev)69 int pcibios_alloc_irq(struct pci_dev *dev)
70 {
71 if (acpi_disabled)
72 return 0;
73 if (pci_dev_msi_enabled(dev))
74 return 0;
75 return acpi_pci_irq_enable(dev);
76 }
77
pci_fixup_vgadev(struct pci_dev * pdev)78 static void pci_fixup_vgadev(struct pci_dev *pdev)
79 {
80 struct pci_dev *devp = NULL;
81
82 while ((devp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, devp))) {
83 if (devp->vendor != PCI_VENDOR_ID_LOONGSON) {
84 vga_set_default_device(devp);
85 dev_info(&pdev->dev,
86 "Overriding boot device as %X:%X\n",
87 devp->vendor, devp->device);
88 }
89 }
90 }
91 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, PCI_DEVICE_ID_LOONGSON_DC1, pci_fixup_vgadev);
92 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, PCI_DEVICE_ID_LOONGSON_DC2, pci_fixup_vgadev);
93