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Add detection of whether the device is AGP by walking the capabilities 

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Eric Anholt 2005-01-17 20:24:52 +00:00
parent c74052cfae
commit 7d0cb01cbf
1 changed files with 37 additions and 1 deletions
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38
bsd-core/drm_agpsupport.c
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@ -32,11 +32,47 @@
#include "drmP.h"
#ifdef __FreeBSD__
#include <pci/agpreg.h>
#include <dev/pci/pcireg.h>
#endif
int
drm_device_is_agp(drm_device_t *dev)
{
/* XXX: FILL ME IN HERE */
#ifdef __FreeBSD__
/* Code taken from agp.c. IWBNI that was a public interface. */
u_int32_t status;
u_int8_t ptr, next;
/*
* Check the CAP_LIST bit of the PCI status register first.
*/
status = pci_read_config(dev->device, PCIR_STATUS, 2);
if (!(status & 0x10))
return 0;
/*
* Traverse the capabilities list.
*/
for (ptr = pci_read_config(dev->device, AGP_CAPPTR, 1);
ptr != 0;
ptr = next) {
u_int32_t capid = pci_read_config(dev->device, ptr, 4);
next = AGP_CAPID_GET_NEXT_PTR(capid);
/*
* If this capability entry ID is 2, then we are done.
*/
if (AGP_CAPID_GET_CAP_ID(capid) == 2)
return 1;
}
return 0;
#else
/* XXX: fill me in for non-FreeBSD */
return 1;
#endif
}
int drm_agp_info(DRM_IOCTL_ARGS)