1 /* 2 * Minimalist driver for a generic PCI-to-EISA bridge. 3 * 4 * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org> 5 * 6 * This code is released under the GPL version 2. 7 * 8 * Ivan Kokshaysky <ink@jurassic.park.msu.ru> : 9 * Generalisation from i82375 to PCI_CLASS_BRIDGE_EISA. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/device.h> 14 #include <linux/eisa.h> 15 #include <linux/pci.h> 16 #include <linux/module.h> 17 #include <linux/init.h> 18 19 /* There is only *one* pci_eisa device per machine, right ? */ 20 static struct eisa_root_device pci_eisa_root; 21 22 static int __init pci_eisa_init(struct pci_dev *pdev, 23 const struct pci_device_id *ent) 24 { 25 int rc, i; 26 struct resource *res, *bus_res = NULL; 27 28 if ((rc = pci_enable_device (pdev))) { 29 printk (KERN_ERR "pci_eisa : Could not enable device %s\n", 30 pci_name(pdev)); 31 return rc; 32 } 33 34 /* 35 * The Intel 82375 PCI-EISA bridge is a subtractive-decode PCI 36 * device, so the resources available on EISA are the same as those 37 * available on the 82375 bus. This works the same as a PCI-PCI 38 * bridge in subtractive-decode mode (see pci_read_bridge_bases()). 39 * We assume other PCI-EISA bridges are similar. 40 * 41 * eisa_root_register() can only deal with a single io port resource, 42 * so we use the first valid io port resource. 43 */ 44 pci_bus_for_each_resource(pdev->bus, res, i) 45 if (res && (res->flags & IORESOURCE_IO)) { 46 bus_res = res; 47 break; 48 } 49 50 if (!bus_res) { 51 dev_err(&pdev->dev, "No resources available\n"); 52 return -1; 53 } 54 55 pci_eisa_root.dev = &pdev->dev; 56 pci_eisa_root.res = bus_res; 57 pci_eisa_root.bus_base_addr = bus_res->start; 58 pci_eisa_root.slots = EISA_MAX_SLOTS; 59 pci_eisa_root.dma_mask = pdev->dma_mask; 60 dev_set_drvdata(pci_eisa_root.dev, &pci_eisa_root); 61 62 if (eisa_root_register (&pci_eisa_root)) { 63 printk (KERN_ERR "pci_eisa : Could not register EISA root\n"); 64 return -1; 65 } 66 67 return 0; 68 } 69 70 static struct pci_device_id pci_eisa_pci_tbl[] = { 71 { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, 72 PCI_CLASS_BRIDGE_EISA << 8, 0xffff00, 0 }, 73 { 0, } 74 }; 75 76 static struct pci_driver __refdata pci_eisa_driver = { 77 .name = "pci_eisa", 78 .id_table = pci_eisa_pci_tbl, 79 .probe = pci_eisa_init, 80 }; 81 82 static int __init pci_eisa_init_module (void) 83 { 84 return pci_register_driver (&pci_eisa_driver); 85 } 86 87 device_initcall(pci_eisa_init_module); 88 MODULE_DEVICE_TABLE(pci, pci_eisa_pci_tbl); 89