From f13eb97ad18688c45eb921d62d09fd427f6887f5 Mon Sep 17 00:00:00 2001
From: jhb <jhb@FreeBSD.org>
Date: Thu, 28 Dec 2006 21:54:50 +0000
Subject: [PATCH] MFC: Use pci_find_extcap() in drm(4) and agp(4).

---
 sys/dev/drm/drm_agpsupport.c |  2 +-
 sys/pci/agp.c                | 29 ++++-------------------------
 sys/pci/agpreg.h             |  8 +-------
 3 files changed, 6 insertions(+), 33 deletions(-)

diff --git a/sys/dev/drm/drm_agpsupport.c b/sys/dev/drm/drm_agpsupport.c
index f809acb7f166..3d657da18ab9 100644
--- a/sys/dev/drm/drm_agpsupport.c
+++ b/sys/dev/drm/drm_agpsupport.c
@@ -46,7 +46,7 @@ static int
 drm_device_find_capability(drm_device_t *dev, int cap)
 {
 #ifdef __FreeBSD__
-#if __FreeBSD_version >= 700010
+#if __FreeBSD_version >= 602102
 
 	return (pci_find_extcap(dev->device, cap, NULL) == 0);
 #else
diff --git a/sys/pci/agp.c b/sys/pci/agp.c
index 6757ebc60316..b44cfc94a31b 100644
--- a/sys/pci/agp.c
+++ b/sys/pci/agp.c
@@ -101,33 +101,12 @@ agp_flush_cache()
 u_int8_t
 agp_find_caps(device_t dev)
 {
-	u_int32_t status;
-	u_int8_t ptr, next;
+	int capreg;
 
-	/*
-	 * Check the CAP_LIST bit of the PCI status register first.
-	 */
-	status = pci_read_config(dev, PCIR_STATUS, 2);
-	if (!(status & 0x10))
-		return 0;
 
-	/*
-	 * Traverse the capabilities list.
-	 */
-	for (ptr = pci_read_config(dev, AGP_CAPPTR, 1);
-	     ptr != 0;
-	     ptr = next) {
-		u_int32_t capid = pci_read_config(dev, 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 ptr;
-	}
-
-	return 0;
+	if (pci_find_extcap(dev, PCIY_AGP, &capreg) != 0)
+		capreg = 0;
+	return (capreg);
 }
 
 /*
diff --git a/sys/pci/agpreg.h b/sys/pci/agpreg.h
index 8e5365e952f6..7786efe5fa52 100644
--- a/sys/pci/agpreg.h
+++ b/sys/pci/agpreg.h
@@ -32,18 +32,12 @@
 /*
  * Offsets for various AGP configuration registers.
  */
-#define AGP_APBASE		0x10
-#define AGP_CAPPTR		0x34
+#define AGP_APBASE		PCIR_BAR(0)
 
 /*
  * Offsets from the AGP Capability pointer.
  */
 #define AGP_CAPID		0x0
-#define AGP_CAPID_GET_MAJOR(x)		(((x) & 0x00f00000U) >> 20)
-#define AGP_CAPID_GET_MINOR(x)		(((x) & 0x000f0000U) >> 16)
-#define AGP_CAPID_GET_NEXT_PTR(x)	(((x) & 0x0000ff00U) >> 8)
-#define AGP_CAPID_GET_CAP_ID(x)		(((x) & 0x000000ffU) >> 0)
-
 #define AGP_STATUS		0x4
 #define AGP_COMMAND		0x8
 #define AGP_STATUS_AGP3		0x0008