2 * Minimalist driver for a generic PCI-to-EISA bridge.
4 * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
6 * This code is released under the GPL version 2.
8 * Ivan Kokshaysky <ink@jurassic.park.msu.ru> :
9 * Generalisation from i82375 to PCI_CLASS_BRIDGE_EISA.
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>
19 /* There is only *one* pci_eisa device per machine, right ? */
20 static struct eisa_root_device pci_eisa_root
;
22 static int __init
pci_eisa_init(struct pci_dev
*pdev
)
25 struct resource
*res
, *bus_res
= NULL
;
27 if ((rc
= pci_enable_device (pdev
))) {
28 printk (KERN_ERR
"pci_eisa : Could not enable device %s\n",
34 * The Intel 82375 PCI-EISA bridge is a subtractive-decode PCI
35 * device, so the resources available on EISA are the same as those
36 * available on the 82375 bus. This works the same as a PCI-PCI
37 * bridge in subtractive-decode mode (see pci_read_bridge_bases()).
38 * We assume other PCI-EISA bridges are similar.
40 * eisa_root_register() can only deal with a single io port resource,
41 * so we use the first valid io port resource.
43 pci_bus_for_each_resource(pdev
->bus
, res
, i
)
44 if (res
&& (res
->flags
& IORESOURCE_IO
)) {
50 dev_err(&pdev
->dev
, "No resources available\n");
54 pci_eisa_root
.dev
= &pdev
->dev
;
55 pci_eisa_root
.res
= bus_res
;
56 pci_eisa_root
.bus_base_addr
= bus_res
->start
;
57 pci_eisa_root
.slots
= EISA_MAX_SLOTS
;
58 pci_eisa_root
.dma_mask
= pdev
->dma_mask
;
59 dev_set_drvdata(pci_eisa_root
.dev
, &pci_eisa_root
);
61 if (eisa_root_register (&pci_eisa_root
)) {
62 printk (KERN_ERR
"pci_eisa : Could not register EISA root\n");
70 * We have to call pci_eisa_init_early() before pnpacpi_init()/isapnp_init().
71 * Otherwise pnp resource will get enabled early and could prevent eisa
73 * Also need to make sure pci_eisa_init_early() is called after
74 * x86/pci_subsys_init().
75 * So need to use subsys_initcall_sync with it.
77 static int __init
pci_eisa_init_early(void)
79 struct pci_dev
*dev
= NULL
;
83 if ((dev
->class >> 8) == PCI_CLASS_BRIDGE_EISA
) {
84 ret
= pci_eisa_init(dev
);
91 subsys_initcall_sync(pci_eisa_init_early
);