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 pcidevaddr_t dev; 14 15 for (dev = 0; dev < 256; ++dev) { 16 uint32_t id = pci_config_read(dev, 0); 17 18 if ((id & 0xFFFF) == vendor_id && (id >> 16) == device_id) 19 return dev; 20 } 21 22 return PCIDEVADDR_INVALID; 23 } 24 25 unsigned long pci_bar_addr(pcidevaddr_t dev, int bar_num) 26 { 27 uint32_t bar = pci_config_read(dev, PCI_BASE_ADDRESS_0 + bar_num * 4); 28 29 if (bar & PCI_BASE_ADDRESS_SPACE_IO) 30 return bar & PCI_BASE_ADDRESS_IO_MASK; 31 else 32 return bar & PCI_BASE_ADDRESS_MEM_MASK; 33 } 34 35 bool pci_bar_is_memory(pcidevaddr_t dev, int bar_num) 36 { 37 uint32_t bar = pci_config_read(dev, PCI_BASE_ADDRESS_0 + bar_num * 4); 38 39 return !(bar & PCI_BASE_ADDRESS_SPACE_IO); 40 } 41 42 bool pci_bar_is_valid(pcidevaddr_t dev, int bar_num) 43 { 44 return pci_config_read(dev, PCI_BASE_ADDRESS_0 + bar_num * 4); 45 } 46