xtensa/kernel/pci.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * PCI bios-type initialisation for PCI machines
7  * Copyright (C) 2001-2005 Tensilica Inc.
24 #include <asm/pci-bridge.h>
30  * addresses to be allocated in the 0x000-0x0ff region
34  * the low 10 bits of the IO address. The 0x00-0xff region
35  * is reserved for motherboard devices that decode all 16
36  * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
37  * but we want to try to avoid allocating at 0x2900-0x2bff
38  * which might have be mirrored at 0x0100-0x03ff..
45 	resource_size_t start = res->start;  in pcibios_align_resource()
47 	if (res->flags & IORESOURCE_IO) {  in pcibios_align_resource()
50 					pci_name(dev), dev->resource - res,  in pcibios_align_resource()
61 void pcibios_fixup_bus(struct pci_bus *bus)  in pcibios_fixup_bus()  argument
63 	if (bus->parent) {  in pcibios_fixup_bus()
65 		pci_read_bridge_bases(bus);  in pcibios_fixup_bus()
70  * Platform support for /proc/bus/pci/X/Y mmap()s.
71  *  -- paulus.
76 	struct pci_controller *pci_ctrl = (struct pci_controller*) pdev->sysdata;  in pci_iobar_pfn()
80 		return -EINVAL;		/* should never happen */  in pci_iobar_pfn()
83 	ioaddr -= (unsigned long)pci_ctrl->io_space.base;  in pci_iobar_pfn()
85 	vma->vm_pgoff += (ioaddr + pci_ctrl->io_space.start) >> PAGE_SHIFT;  in pci_iobar_pfn()