1 /* 2 * Copyright (C) 2013, Red Hat Inc, Michael S. Tsirkin <mst@redhat.com> 3 * 4 * This work is licensed under the terms of the GNU LGPL, version 2. 5 */ 6 #include <linux/pci_regs.h> 7 #include "pci.h" 8 #include "asm/pci.h" 9 10 /* Scan bus look for a specific device. Only bus 0 scanned for now. */ 11 pcidevaddr_t pci_find_dev(uint16_t vendor_id, uint16_t device_id) 12 { 13 unsigned dev; 14 for (dev = 0; dev < 256; ++dev) { 15 uint32_t id = pci_config_read(dev, 0); 16 if ((id & 0xFFFF) == vendor_id && (id >> 16) == device_id) { 17 return dev; 18 } 19 } 20 return PCIDEVADDR_INVALID; 21 } 22 23 unsigned long pci_bar_addr(pcidevaddr_t dev, int bar_num) 24 { 25 uint32_t bar = pci_config_read(dev, PCI_BASE_ADDRESS_0 + bar_num * 4); 26 if (bar & PCI_BASE_ADDRESS_SPACE_IO) { 27 return bar & PCI_BASE_ADDRESS_IO_MASK; 28 } else { 29 return bar & PCI_BASE_ADDRESS_MEM_MASK; 30 } 31 } 32 33 bool pci_bar_is_memory(pcidevaddr_t dev, int bar_num) 34 { 35 uint32_t bar = pci_config_read(dev, PCI_BASE_ADDRESS_0 + bar_num * 4); 36 return !(bar & PCI_BASE_ADDRESS_SPACE_IO); 37 } 38 39 bool pci_bar_is_valid(pcidevaddr_t dev, int bar_num) 40 { 41 uint32_t bar = pci_config_read(dev, PCI_BASE_ADDRESS_0 + bar_num * 4); 42 return bar; 43 } 44