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/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 highest level in the 49 * cache hierarchy. 50 */ 51 lsize = cpu_dcache_line_size(); 52 lsize = cpu_vcache_line_size() ? : lsize; 53 lsize = cpu_scache_line_size() ? : lsize; 54 55 BUG_ON(!lsize); 56 57 pci_dfl_cache_line_size = lsize >> 2; 58 59 pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize); 60 61 return 0; 62 } 63 64 subsys_initcall(pcibios_init); 65 66 int pcibios_device_add(struct pci_dev *dev) 67 { 68 int id; 69 struct irq_domain *dom; 70 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); 74 75 return 0; 76 } 77 78 int pcibios_alloc_irq(struct pci_dev *dev) 79 { 80 if (acpi_disabled) 81 return 0; 82 if (pci_dev_msi_enabled(dev)) 83 return 0; 84 return acpi_pci_irq_enable(dev); 85 } 86 87 static void pci_fixup_vgadev(struct pci_dev *pdev) 88 { 89 struct pci_dev *devp = NULL; 90 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); 94 dev_info(&pdev->dev, 95 "Overriding boot device as %X:%X\n", 96 devp->vendor, devp->device); 97 } 98 } 99 } 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); 102