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/*
* This file is part of the coreboot project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define __SIMPLE_DEVICE__
#include <stdint.h>
#include <device/pci.h>
#include <device/pci_def.h>
#include <device/pci_ops.h>
#include <device/pci_type.h>
u8 *const pci_mmconf = (void *)(uintptr_t)CONFIG_MMCONF_BASE_ADDRESS;
/**
* Given a device, a capability type, and a last position, return the next
* matching capability. Always start at the head of the list.
*
* @param dev Pointer to the device structure.
* @param cap PCI_CAP_LIST_ID of the PCI capability we're looking for.
* @param last Location of the PCI capability register to start from.
* @return The next matching capability.
*/
u16 pci_s_find_next_capability(pci_devfn_t dev, u16 cap, u16 last)
{
u16 pos = 0;
u16 status;
int reps = 48;
status = pci_s_read_config16(dev, PCI_STATUS);
if (!(status & PCI_STATUS_CAP_LIST))
return 0;
u8 hdr_type = pci_s_read_config8(dev, PCI_HEADER_TYPE);
switch (hdr_type & 0x7f) {
case PCI_HEADER_TYPE_NORMAL:
case PCI_HEADER_TYPE_BRIDGE:
pos = PCI_CAPABILITY_LIST;
break;
case PCI_HEADER_TYPE_CARDBUS:
pos = PCI_CB_CAPABILITY_LIST;
break;
default:
return 0;
}
pos = pci_s_read_config8(dev, pos);
while (reps-- && (pos >= 0x40)) { /* Loop through the linked list. */
int this_cap;
pos &= ~3;
this_cap = pci_s_read_config8(dev, pos + PCI_CAP_LIST_ID);
if (this_cap == 0xff)
break;
if (!last && (this_cap == cap))
return pos;
if (last == pos)
last = 0;
pos = pci_s_read_config8(dev, pos + PCI_CAP_LIST_NEXT);
}
return 0;
}
/**
* Given a device, and a capability type, return the next matching
* capability. Always start at the head of the list.
*
* @param dev Pointer to the device structure.
* @param cap PCI_CAP_LIST_ID of the PCI capability we're looking for.
* @return The next matching capability.
*/
u16 pci_s_find_capability(pci_devfn_t dev, u16 cap)
{
return pci_s_find_next_capability(dev, cap, 0);
}
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