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 { 24 int rc, i; 25 struct resource *res, *bus_res = NULL; 26 27 if ((rc = pci_enable_device (pdev))) { 28 dev_err(&pdev->dev, "Could not enable device\n"); 29 return rc; 30 } 31 32 /* 33 * The Intel 82375 PCI-EISA bridge is a subtractive-decode PCI 34 * device, so the resources available on EISA are the same as those 35 * available on the 82375 bus. This works the same as a PCI-PCI 36 * bridge in subtractive-decode mode (see pci_read_bridge_bases()). 37 * We assume other PCI-EISA bridges are similar. 38 * 39 * eisa_root_register() can only deal with a single io port resource, 40 * so we use the first valid io port resource. 41 */ 42 pci_bus_for_each_resource(pdev->bus, res, i) 43 if (res && (res->flags & IORESOURCE_IO)) { 44 bus_res = res; 45 break; 46 } 47 48 if (!bus_res) { 49 dev_err(&pdev->dev, "No resources available\n"); 50 return -1; 51 } 52 53 pci_eisa_root.dev = &pdev->dev; 54 pci_eisa_root.res = bus_res; 55 pci_eisa_root.bus_base_addr = bus_res->start; 56 pci_eisa_root.slots = EISA_MAX_SLOTS; 57 pci_eisa_root.dma_mask = pdev->dma_mask; 58 dev_set_drvdata(pci_eisa_root.dev, &pci_eisa_root); 59 60 if (eisa_root_register (&pci_eisa_root)) { 61 dev_err(&pdev->dev, "Could not register EISA root\n"); 62 return -1; 63 } 64 65 return 0; 66 } 67 68 /* 69 * We have to call pci_eisa_init_early() before pnpacpi_init()/isapnp_init(). 70 * Otherwise pnp resource will get enabled early and could prevent eisa 71 * to be initialized. 72 * Also need to make sure pci_eisa_init_early() is called after 73 * x86/pci_subsys_init(). 74 * So need to use subsys_initcall_sync with it. 75 */ 76 static int __init pci_eisa_init_early(void) 77 { 78 struct pci_dev *dev = NULL; 79 int ret; 80 81 for_each_pci_dev(dev) 82 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_EISA) { 83 ret = pci_eisa_init(dev); 84 if (ret) 85 return ret; 86 } 87 88 return 0; 89 } 90 subsys_initcall_sync(pci_eisa_init_early); 91