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PCI: Add capability list parser to romstage

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These are almost one-to-one copies from pci_device.c. However,
devicetree has not been enumerated yet and we have no console.

Change-Id: Ic80c781626521d03adde05bdb1916acce31290ea
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5196
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@google.com>
This commit is contained in:
Kyösti Mälkki
2014-02-11 19:56:57 +02:00
parent 2c78726897
commit 2161c1d792
3 changed files with 74 additions and 3 deletions
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68
src/device/pci_early.c Normal file
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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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*/
#include <arch/io.h>
#include <device/pci.h>
#include <device/pci_def.h>
unsigned pci_find_next_capability(device_t dev, unsigned cap, unsigned last)
{
unsigned pos = 0;
u16 status;
unsigned reps = 48;
status = pci_read_config16(dev, PCI_STATUS);
if (!(status & PCI_STATUS_CAP_LIST))
return 0;
u8 hdr_type = pci_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_read_config8(dev, pos);
while (reps-- && (pos >= 0x40)) { /* Loop through the linked list. */
int this_cap;
pos &= ~3;
this_cap = pci_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_read_config8(dev, pos + PCI_CAP_LIST_NEXT);
}
return 0;
}
unsigned pci_find_capability(device_t dev, unsigned cap)
{
return pci_find_next_capability(dev, cap, 0);
}