1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
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 <asm/loongson.h> |
14 | |
15 | #define PCI_DEVICE_ID_LOONGSON_HOST 0x7a00 |
16 | #define PCI_DEVICE_ID_LOONGSON_DC1 0x7a06 |
17 | #define PCI_DEVICE_ID_LOONGSON_DC2 0x7a36 |
18 | |
19 | int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn, |
20 | int reg, int len, u32 *val) |
21 | { |
22 | struct pci_bus *bus_tmp = pci_find_bus(domain, busnr: bus); |
23 | |
24 | if (bus_tmp) |
25 | return bus_tmp->ops->read(bus_tmp, devfn, reg, len, val); |
26 | return -EINVAL; |
27 | } |
28 | |
29 | int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn, |
30 | int reg, int len, u32 val) |
31 | { |
32 | struct pci_bus *bus_tmp = pci_find_bus(domain, busnr: bus); |
33 | |
34 | if (bus_tmp) |
35 | return bus_tmp->ops->write(bus_tmp, devfn, reg, len, val); |
36 | return -EINVAL; |
37 | } |
38 | |
39 | phys_addr_t mcfg_addr_init(int node) |
40 | { |
41 | return (((u64)node << 44) | MCFG_EXT_PCICFG_BASE); |
42 | } |
43 | |
44 | static int __init pcibios_init(void) |
45 | { |
46 | unsigned int lsize; |
47 | |
48 | /* |
49 | * Set PCI cacheline size to that of the last level in the |
50 | * cache hierarchy. |
51 | */ |
52 | lsize = cpu_last_level_cache_line_size(); |
53 | |
54 | BUG_ON(!lsize); |
55 | |
56 | pci_dfl_cache_line_size = lsize >> 2; |
57 | |
58 | pr_debug("PCI: pci_cache_line_size set to %d bytes\n" , lsize); |
59 | |
60 | return 0; |
61 | } |
62 | |
63 | subsys_initcall(pcibios_init); |
64 | |
65 | int pcibios_device_add(struct pci_dev *dev) |
66 | { |
67 | int id; |
68 | struct irq_domain *dom; |
69 | |
70 | id = pci_domain_nr(bus: dev->bus); |
71 | dom = irq_find_matching_fwnode(get_pch_msi_handle(id), DOMAIN_BUS_PCI_MSI); |
72 | dev_set_msi_domain(dev: &dev->dev, d: dom); |
73 | |
74 | return 0; |
75 | } |
76 | |
77 | int pcibios_alloc_irq(struct pci_dev *dev) |
78 | { |
79 | if (acpi_disabled) |
80 | return 0; |
81 | if (pci_dev_msi_enabled(pci_dev: dev)) |
82 | return 0; |
83 | return acpi_pci_irq_enable(dev); |
84 | } |
85 | |
86 | static void pci_fixup_vgadev(struct pci_dev *pdev) |
87 | { |
88 | struct pci_dev *devp = NULL; |
89 | |
90 | while ((devp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, from: devp))) { |
91 | if (devp->vendor != PCI_VENDOR_ID_LOONGSON) { |
92 | vga_set_default_device(pdev: devp); |
93 | dev_info(&pdev->dev, |
94 | "Overriding boot device as %X:%X\n" , |
95 | devp->vendor, devp->device); |
96 | } |
97 | } |
98 | } |
99 | DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, PCI_DEVICE_ID_LOONGSON_DC1, pci_fixup_vgadev); |
100 | DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, PCI_DEVICE_ID_LOONGSON_DC2, pci_fixup_vgadev); |
101 | |