1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Implement the default iomap interfaces 4 * 5 * (C) Copyright 2004 Linus Torvalds 6 * (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org> 7 * (C) Copyright 2007 MIPS Technologies, Inc. 8 * written by Ralf Baechle <ralf@linux-mips.org> 9 */ 10 #include <linux/pci.h> 11 #include <linux/export.h> 12 #include <asm/io.h> 13 14 #ifdef CONFIG_PCI_DRIVERS_LEGACY 15 16 void __iomem *__pci_ioport_map(struct pci_dev *dev, 17 unsigned long port, unsigned int nr) 18 { 19 struct pci_controller *ctrl = dev->bus->sysdata; 20 unsigned long base = ctrl->io_map_base; 21 22 /* This will eventually become a BUG_ON but for now be gentle */ 23 if (unlikely(!ctrl->io_map_base)) { 24 struct pci_bus *bus = dev->bus; 25 char name[8]; 26 27 while (bus->parent) 28 bus = bus->parent; 29 30 ctrl->io_map_base = base = mips_io_port_base; 31 32 sprintf(name, "%04x:%02x", pci_domain_nr(bus), bus->number); 33 printk(KERN_WARNING "io_map_base of root PCI bus %s unset. " 34 "Trying to continue but you better\nfix this issue or " 35 "report it to linux-mips@linux-mips.org or your " 36 "vendor.\n", name); 37 #ifdef CONFIG_PCI_DOMAINS 38 panic("To avoid data corruption io_map_base MUST be set with " 39 "multiple PCI domains."); 40 #endif 41 } 42 43 return (void __iomem *) (ctrl->io_map_base + port); 44 } 45 46 #endif /* CONFIG_PCI_DRIVERS_LEGACY */ 47