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/init.h> 7 #include <linux/acpi.h> 8 #include <linux/types.h> 9 #include <linux/pci.h> 10 #include <linux/vgaarb.h> 11 #include <asm/cacheflush.h> 12 #include <asm/loongson.h> 13 14 #define PCI_DEVICE_ID_LOONGSON_HOST 0x7a00 15 #define PCI_DEVICE_ID_LOONGSON_DC1 0x7a06 16 #define PCI_DEVICE_ID_LOONGSON_DC2 0x7a36 17 18 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn, 19 int reg, int len, u32 *val) 20 { 21 struct pci_bus *bus_tmp = pci_find_bus(domain, bus); 22 23 if (bus_tmp) 24 return bus_tmp->ops->read(bus_tmp, devfn, reg, len, val); 25 return -EINVAL; 26 } 27 28 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn, 29 int reg, int len, u32 val) 30 { 31 struct pci_bus *bus_tmp = pci_find_bus(domain, bus); 32 33 if (bus_tmp) 34 return bus_tmp->ops->write(bus_tmp, devfn, reg, len, val); 35 return -EINVAL; 36 } 37 38 phys_addr_t mcfg_addr_init(int node) 39 { 40 return (((u64)node << 44) | MCFG_EXT_PCICFG_BASE); 41 } 42 43 static int __init pcibios_init(void) 44 { 45 unsigned int lsize; 46 47 /* 48 * Set PCI cacheline size to that of the last level in the 49 * cache hierarchy. 50 */ 51 lsize = cpu_last_level_cache_line_size(); 52 53 BUG_ON(!lsize); 54 55 pci_dfl_cache_line_size = lsize >> 2; 56 57 pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize); 58 59 return 0; 60 } 61 62 subsys_initcall(pcibios_init); 63 64 int pcibios_device_add(struct pci_dev *dev) 65 { 66 int id; 67 struct irq_domain *dom; 68 69 id = pci_domain_nr(dev->bus); 70 dom = irq_find_matching_fwnode(get_pch_msi_handle(id), DOMAIN_BUS_PCI_MSI); 71 dev_set_msi_domain(&dev->dev, dom); 72 73 return 0; 74 } 75 76 int pcibios_alloc_irq(struct pci_dev *dev) 77 { 78 if (acpi_disabled) 79 return 0; 80 if (pci_dev_msi_enabled(dev)) 81 return 0; 82 return acpi_pci_irq_enable(dev); 83 } 84 85 static void pci_fixup_vgadev(struct pci_dev *pdev) 86 { 87 struct pci_dev *devp = NULL; 88 89 while ((devp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, devp))) { 90 if (devp->vendor != PCI_VENDOR_ID_LOONGSON) { 91 vga_set_default_device(devp); 92 dev_info(&pdev->dev, 93 "Overriding boot device as %X:%X\n", 94 devp->vendor, devp->device); 95 } 96 } 97 } 98 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, PCI_DEVICE_ID_LOONGSON_DC1, pci_fixup_vgadev); 99 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, PCI_DEVICE_ID_LOONGSON_DC2, pci_fixup_vgadev); 100