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Linux/drivers/eisa/pci_eisa.c

  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 

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