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, 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, 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(dev->bus); 71 dom = irq_find_matching_fwnode(get_pch_msi_handle(id), DOMAIN_BUS_PCI_MSI); 72 dev_set_msi_domain(&dev->dev, 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(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, devp))) { 91 if (devp->vendor != PCI_VENDOR_ID_LOONGSON) { 92 vga_set_default_device(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