69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
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/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
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*/
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#include <arch/io.h>
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#include <device/pci.h>
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#include <device/pci_def.h>
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unsigned pci_find_next_capability(device_t dev, unsigned cap, unsigned last)
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{
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unsigned pos = 0;
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u16 status;
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unsigned reps = 48;
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status = pci_read_config16(dev, PCI_STATUS);
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if (!(status & PCI_STATUS_CAP_LIST))
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return 0;
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u8 hdr_type = pci_read_config8(dev, PCI_HEADER_TYPE);
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switch (hdr_type & 0x7f) {
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case PCI_HEADER_TYPE_NORMAL:
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case PCI_HEADER_TYPE_BRIDGE:
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pos = PCI_CAPABILITY_LIST;
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break;
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case PCI_HEADER_TYPE_CARDBUS:
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pos = PCI_CB_CAPABILITY_LIST;
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break;
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default:
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return 0;
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}
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pos = pci_read_config8(dev, pos);
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while (reps-- && (pos >= 0x40)) { /* Loop through the linked list. */
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int this_cap;
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pos &= ~3;
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this_cap = pci_read_config8(dev, pos + PCI_CAP_LIST_ID);
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if (this_cap == 0xff)
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break;
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if (!last && (this_cap == cap))
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return pos;
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if (last == pos)
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last = 0;
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pos = pci_read_config8(dev, pos + PCI_CAP_LIST_NEXT);
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}
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return 0;
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}
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unsigned pci_find_capability(device_t dev, unsigned cap)
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{
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return pci_find_next_capability(dev, cap, 0);
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}
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