From 53dc09a8e62fc28bbc5f2ec3abadd5f688218b81 Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Tue, 4 Nov 2014 09:56:58 +0000
Subject: [PATCH] Revert agp_intel.c part of the r274040 for now.  There is a
 confusion on my part about north bridge/GPU pci ids and use of aperture.

Leave the agp_intel.c out of static compilation on amd64, it makes the
things consistent with agp.ko.

Pointed out by:	tijl
Sponsored by:	The FreeBSD Foundation
MFC after:	13 days
---
 sys/dev/agp/agp_intel.c | 95 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)

diff --git a/sys/dev/agp/agp_intel.c b/sys/dev/agp/agp_intel.c
index 14c8b0f8bdc8..719758034ce1 100644
--- a/sys/dev/agp/agp_intel.c
+++ b/sys/dev/agp/agp_intel.c
@@ -76,6 +76,35 @@ agp_intel_match(device_t dev)
  		return ("Intel 82443GX host to PCI bridge");
  	case 0x71a18086:
  		return ("Intel 82443GX host to AGP bridge");
+	case 0x11308086:
+		return ("Intel 82815 (i815 GMCH) host to PCI bridge");
+	case 0x25008086:
+	case 0x25018086:
+		return ("Intel 82820 host to AGP bridge");
+	case 0x35758086:
+		return ("Intel 82830 host to AGP bridge");
+	case 0x1a218086:
+		return ("Intel 82840 host to AGP bridge");
+	case 0x1a308086:
+		return ("Intel 82845 host to AGP bridge");
+	case 0x25308086:
+		return ("Intel 82850 host to AGP bridge");
+	case 0x33408086:
+		return ("Intel 82855 host to AGP bridge");
+	case 0x25318086:
+		return ("Intel 82860 host to AGP bridge");
+	case 0x25708086:
+		return ("Intel 82865 host to AGP bridge");
+	case 0x255d8086:
+		return ("Intel E7205 host to AGP bridge");
+	case 0x25508086:
+		return ("Intel E7505 host to AGP bridge");
+	case 0x25788086:
+		return ("Intel 82875P host to AGP bridge");
+	case 0x25608086:
+		return ("Intel 82845G host to AGP bridge");
+	case 0x35808086:
+		return ("Intel 82855GM host to AGP bridge");
 	}
 
 	return (NULL);
@@ -129,6 +158,31 @@ agp_intel_commit_gatt(device_t dev)
 
 	/* Enable aperture accesses. */
 	switch (type) {
+	case 0x25008086: /* i820 */
+	case 0x25018086: /* i820 */
+		pci_write_config(dev, AGP_INTEL_I820_RDCR,
+				 (pci_read_config(dev, AGP_INTEL_I820_RDCR, 1)
+				  | (1 << 1)), 1);
+		break;
+	case 0x1a308086: /* i845 */
+	case 0x25608086: /* i845G */
+	case 0x33408086: /* i855 */
+	case 0x35808086: /* i855GM */
+	case 0x25708086: /* i865 */
+	case 0x25788086: /* i875P */
+		pci_write_config(dev, AGP_INTEL_I845_AGPM,
+				 (pci_read_config(dev, AGP_INTEL_I845_AGPM, 1)
+				  | (1 << 1)), 1);
+		break;
+	case 0x1a218086: /* i840 */
+	case 0x25308086: /* i850 */
+	case 0x25318086: /* i860 */
+	case 0x255d8086: /* E7205 */
+	case 0x25508086: /* E7505 */
+		pci_write_config(dev, AGP_INTEL_MCHCFG,
+				 (pci_read_config(dev, AGP_INTEL_MCHCFG, 2)
+				  | (1 << 9)), 2);
+		break;
 	default: /* Intel Generic (maybe) */
 		pci_write_config(dev, AGP_INTEL_NBXCFG,
 				 (pci_read_config(dev, AGP_INTEL_NBXCFG, 4)
@@ -137,6 +191,22 @@ agp_intel_commit_gatt(device_t dev)
 
 	/* Clear errors. */
 	switch (type) {
+	case 0x1a218086: /* i840 */
+		pci_write_config(dev, AGP_INTEL_I8XX_ERRSTS, 0xc000, 2);
+		break;
+	case 0x25008086: /* i820 */
+	case 0x25018086: /* i820 */
+	case 0x1a308086: /* i845 */
+	case 0x25608086: /* i845G */
+	case 0x25308086: /* i850 */
+	case 0x33408086: /* i855 */
+	case 0x25318086: /* i860 */
+	case 0x25708086: /* i865 */
+	case 0x25788086: /* i875P */
+	case 0x255d8086: /* E7205 */
+	case 0x25508086: /* E7505 */
+		pci_write_config(dev, AGP_INTEL_I8XX_ERRSTS, 0x00ff, 2);
+		break;
 	default: /* Intel Generic (maybe) */
 		pci_write_config(dev, AGP_INTEL_ERRSTS + 1, 7, 1);
 	}
@@ -197,6 +267,31 @@ agp_intel_detach(device_t dev)
 
 	/* Disable aperture accesses. */
 	switch (pci_get_devid(dev)) {
+	case 0x25008086: /* i820 */
+	case 0x25018086: /* i820 */
+		reg = pci_read_config(dev, AGP_INTEL_I820_RDCR, 1) & ~(1 << 1);
+		printf("%s: set RDCR to %02x\n", __func__, reg & 0xff);
+		pci_write_config(dev, AGP_INTEL_I820_RDCR, reg, 1);
+		break;
+	case 0x1a308086: /* i845 */
+	case 0x25608086: /* i845G */
+	case 0x33408086: /* i855 */
+	case 0x35808086: /* i855GM */
+	case 0x25708086: /* i865 */
+	case 0x25788086: /* i875P */
+		reg = pci_read_config(dev, AGP_INTEL_I845_AGPM, 1) & ~(1 << 1);
+		printf("%s: set AGPM to %02x\n", __func__, reg & 0xff);
+		pci_write_config(dev, AGP_INTEL_I845_AGPM, reg, 1);
+		break;
+	case 0x1a218086: /* i840 */
+	case 0x25308086: /* i850 */
+	case 0x25318086: /* i860 */
+	case 0x255d8086: /* E7205 */
+	case 0x25508086: /* E7505 */
+		reg = pci_read_config(dev, AGP_INTEL_MCHCFG, 2) & ~(1 << 9);
+		printf("%s: set MCHCFG to %x04\n", __func__, reg & 0xffff);
+		pci_write_config(dev, AGP_INTEL_MCHCFG, reg, 2);
+		break;
 	default: /* Intel Generic (maybe) */
 		reg = pci_read_config(dev, AGP_INTEL_NBXCFG, 4) & ~(1 << 9);
 		printf("%s: set NBXCFG to %08x\n", __func__, reg);