90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Minimalist driver for a generic PCI-to-EISA bridge.
|
|
*
|
|
* (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
|
|
*
|
|
* Ivan Kokshaysky <ink@jurassic.park.msu.ru> :
|
|
* Generalisation from i82375 to PCI_CLASS_BRIDGE_EISA.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/device.h>
|
|
#include <linux/eisa.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
|
|
/* There is only *one* pci_eisa device per machine, right ? */
|
|
static struct eisa_root_device pci_eisa_root;
|
|
|
|
static int __init pci_eisa_init(struct pci_dev *pdev)
|
|
{
|
|
int rc, i;
|
|
struct resource *res, *bus_res = NULL;
|
|
|
|
if ((rc = pci_enable_device (pdev))) {
|
|
dev_err(&pdev->dev, "Could not enable device\n");
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* The Intel 82375 PCI-EISA bridge is a subtractive-decode PCI
|
|
* device, so the resources available on EISA are the same as those
|
|
* available on the 82375 bus. This works the same as a PCI-PCI
|
|
* bridge in subtractive-decode mode (see pci_read_bridge_bases()).
|
|
* We assume other PCI-EISA bridges are similar.
|
|
*
|
|
* eisa_root_register() can only deal with a single io port resource,
|
|
* so we use the first valid io port resource.
|
|
*/
|
|
pci_bus_for_each_resource(pdev->bus, res, i)
|
|
if (res && (res->flags & IORESOURCE_IO)) {
|
|
bus_res = res;
|
|
break;
|
|
}
|
|
|
|
if (!bus_res) {
|
|
dev_err(&pdev->dev, "No resources available\n");
|
|
return -1;
|
|
}
|
|
|
|
pci_eisa_root.dev = &pdev->dev;
|
|
pci_eisa_root.res = bus_res;
|
|
pci_eisa_root.bus_base_addr = bus_res->start;
|
|
pci_eisa_root.slots = EISA_MAX_SLOTS;
|
|
pci_eisa_root.dma_mask = pdev->dma_mask;
|
|
dev_set_drvdata(pci_eisa_root.dev, &pci_eisa_root);
|
|
|
|
if (eisa_root_register (&pci_eisa_root)) {
|
|
dev_err(&pdev->dev, "Could not register EISA root\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We have to call pci_eisa_init_early() before pnpacpi_init()/isapnp_init().
|
|
* Otherwise pnp resource will get enabled early and could prevent eisa
|
|
* to be initialized.
|
|
* Also need to make sure pci_eisa_init_early() is called after
|
|
* x86/pci_subsys_init().
|
|
* So need to use subsys_initcall_sync with it.
|
|
*/
|
|
static int __init pci_eisa_init_early(void)
|
|
{
|
|
struct pci_dev *dev = NULL;
|
|
int ret;
|
|
|
|
for_each_pci_dev(dev)
|
|
if ((dev->class >> 8) == PCI_CLASS_BRIDGE_EISA) {
|
|
ret = pci_eisa_init(dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall_sync(pci_eisa_init_early);
|