drm/nouveau/pci: merge agp handling from nouveau drm

This commit reinstates the pre-DEVINIT AGP fiddling that was broken in
an earlier commit.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

4 files changed, 216 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/Kbuild b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/Kbuild
index a8e9b0fc447e..99672c3d0bad 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/Kbuild
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/Kbuild
@@ -1,3 +1,4 @@
+nvkm-y += nvkm/subdev/pci/agp.o
 nvkm-y += nvkm/subdev/pci/base.o
 nvkm-y += nvkm/subdev/pci/nv04.o
 nvkm-y += nvkm/subdev/pci/nv40.o
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/agp.c b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/agp.c
new file mode 100644
index 000000000000..814cb51cc873
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/agp.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright 2015 Nouveau Project
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "agp.h"
+#ifdef __NVKM_PCI_AGP_H__
+#include <core/option.h>
+
+struct nvkm_device_agp_quirk {
+	u16 hostbridge_vendor;
+	u16 hostbridge_device;
+	u16 chip_vendor;
+	u16 chip_device;
+	int mode;
+};
+
+static const struct nvkm_device_agp_quirk
+nvkm_device_agp_quirks[] = {
+	/* VIA Apollo PRO133x / GeForce FX 5600 Ultra - fdo#20341 */
+	{ PCI_VENDOR_ID_VIA, 0x0691, PCI_VENDOR_ID_NVIDIA, 0x0311, 2 },
+	{},
+};
+
+void
+nvkm_agp_fini(struct nvkm_pci *pci)
+{
+	if (pci->agp.acquired) {
+		agp_backend_release(pci->agp.bridge);
+		pci->agp.acquired = false;
+	}
+}
+
+/* Ensure AGP controller is in a consistent state in case we need to
+ * execute the VBIOS DEVINIT scripts.
+ */
+void
+nvkm_agp_preinit(struct nvkm_pci *pci)
+{
+	struct nvkm_device *device = pci->subdev.device;
+	u32 mode = nvkm_pci_rd32(pci, 0x004c);
+	u32 save[2];
+
+	/* First of all, disable fast writes, otherwise if it's already
+	 * enabled in the AGP bridge and we disable the card's AGP
+	 * controller we might be locking ourselves out of it.
+	 */
+	if ((mode | pci->agp.mode) & PCI_AGP_COMMAND_FW) {
+		mode = pci->agp.mode & ~PCI_AGP_COMMAND_FW;
+		agp_enable(pci->agp.bridge, mode);
+	}
+
+	/* clear busmaster bit, and disable AGP */
+	save[0] = nvkm_pci_rd32(pci, 0x0004);
+	nvkm_pci_wr32(pci, 0x0004, save[0] & ~0x00000004);
+	nvkm_pci_wr32(pci, 0x004c, 0x00000000);
+
+	/* reset PGRAPH, PFIFO and PTIMER */
+	save[1] = nvkm_mask(device, 0x000200, 0x00011100, 0x00000000);
+	nvkm_mask(device, 0x000200, 0x00011100, save[1]);
+
+	/* and restore busmaster bit (gives effect of resetting AGP) */
+	nvkm_pci_wr32(pci, 0x0004, save[0]);
+}
+
+int
+nvkm_agp_init(struct nvkm_pci *pci)
+{
+	if (!agp_backend_acquire(pci->pdev)) {
+		nvkm_error(&pci->subdev, "failed to acquire agp\n");
+		return -ENODEV;
+	}
+
+	agp_enable(pci->agp.bridge, pci->agp.mode);
+	pci->agp.acquired = true;
+	return 0;
+}
+
+void
+nvkm_agp_dtor(struct nvkm_pci *pci)
+{
+	arch_phys_wc_del(pci->agp.mtrr);
+}
+
+void
+nvkm_agp_ctor(struct nvkm_pci *pci)
+{
+	const struct nvkm_device_agp_quirk *quirk = nvkm_device_agp_quirks;
+	struct nvkm_subdev *subdev = &pci->subdev;
+	struct nvkm_device *device = subdev->device;
+	struct agp_kern_info info;
+	int mode = -1;
+
+#ifdef __powerpc__
+	/* Disable AGP by default on all PowerPC machines for now -- At
+	 * least some UniNorth-2 AGP bridges are known to be broken:
+	 * DMA from the host to the card works just fine, but writeback
+	 * from the card to the host goes straight to memory
+	 * untranslated bypassing that GATT somehow, making them quite
+	 * painful to deal with...
+	 */
+	mode = 0;
+#endif
+	mode = nvkm_longopt(device->cfgopt, "NvAGP", mode);
+
+	/* acquire bridge temporarily, so that we can copy its info */
+	if (!(pci->agp.bridge = agp_backend_acquire(pci->pdev))) {
+		nvkm_warn(subdev, "failed to acquire agp\n");
+		return;
+	}
+	agp_copy_info(pci->agp.bridge, &info);
+	agp_backend_release(pci->agp.bridge);
+
+	pci->agp.mode = info.mode;
+	pci->agp.base = info.aper_base;
+	pci->agp.size = info.aper_size * 1024 * 1024;
+	pci->agp.cma  = info.cant_use_aperture;
+	pci->agp.mtrr = -1;
+
+	/* determine if bridge + chipset combination needs a workaround */
+	while (quirk->hostbridge_vendor) {
+		if (info.device->vendor == quirk->hostbridge_vendor &&
+		    info.device->device == quirk->hostbridge_device &&
+		    pci->pdev->vendor == quirk->chip_vendor &&
+		    pci->pdev->device == quirk->chip_device) {
+			nvkm_info(subdev, "forcing default agp mode to %dX, "
+					  "use NvAGP=<mode> to override\n",
+				  quirk->mode);
+			mode = quirk->mode;
+			break;
+		}
+		quirk++;
+	}
+
+	/* apply quirk / user-specified mode */
+	if (mode >= 1) {
+		if (pci->agp.mode & 0x00000008)
+			mode /= 4; /* AGPv3 */
+		pci->agp.mode &= ~0x00000007;
+		pci->agp.mode |= (mode & 0x7);
+	} else
+	if (mode == 0) {
+		pci->agp.bridge = NULL;
+		return;
+	}
+
+	/* fast writes appear to be broken on nv18, they make the card
+	 * lock up randomly.
+	 */
+	if (device->chipset == 0x18)
+		pci->agp.mode &= ~PCI_AGP_COMMAND_FW;
+
+	pci->agp.mtrr = arch_phys_wc_add(pci->agp.base, pci->agp.size);
+}
+#endif
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/agp.h b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/agp.h
new file mode 100644
index 000000000000..df2dd08363ad
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/agp.h
@@ -0,0 +1,18 @@
+#include "priv.h"
+#if defined(CONFIG_AGP) || (defined(CONFIG_AGP_MODULE) && defined(MODULE))
+#ifndef __NVKM_PCI_AGP_H__
+#define __NVKM_PCI_AGP_H__
+
+void nvkm_agp_ctor(struct nvkm_pci *);
+void nvkm_agp_dtor(struct nvkm_pci *);
+void nvkm_agp_preinit(struct nvkm_pci *);
+int nvkm_agp_init(struct nvkm_pci *);
+void nvkm_agp_fini(struct nvkm_pci *);
+#endif
+#else
+static inline void nvkm_agp_ctor(struct nvkm_pci *pci) {}
+static inline void nvkm_agp_dtor(struct nvkm_pci *pci) {}
+static inline void nvkm_agp_preinit(struct nvkm_pci *pci) {}
+static inline int nvkm_agp_init(struct nvkm_pci *pci) { return -ENOSYS; }
+static inline void nvkm_agp_fini(struct nvkm_pci *pci) {}
+#endif
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c
index e5e0d02f3d88..d1c148e51922 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c
@@ -22,6 +22,7 @@
  * Authors: Ben Skeggs <bskeggs@redhat.com>
  */
 #include "priv.h"
+#include "agp.h"
 
 #include <core/option.h>
 #include <core/pci.h>
@@ -76,10 +77,24 @@ static int
 nvkm_pci_fini(struct nvkm_subdev *subdev, bool suspend)
 {
 	struct nvkm_pci *pci = nvkm_pci(subdev);
+
 	if (pci->irq >= 0) {
 		free_irq(pci->irq, pci);
 		pci->irq = -1;
 	};
+
+	if (pci->agp.bridge)
+		nvkm_agp_fini(pci);
+
+	return 0;
+}
+
+static int
+nvkm_pci_preinit(struct nvkm_subdev *subdev)
+{
+	struct nvkm_pci *pci = nvkm_pci(subdev);
+	if (pci->agp.bridge)
+		nvkm_agp_preinit(pci);
 	return 0;
 }
 
@@ -90,6 +105,12 @@ nvkm_pci_init(struct nvkm_subdev *subdev)
 	struct pci_dev *pdev = pci->pdev;
 	int ret;
 
+	if (pci->agp.bridge) {
+		ret = nvkm_agp_init(pci);
+		if (ret)
+			return ret;
+	}
+
 	ret = request_irq(pdev->irq, nvkm_pci_intr, IRQF_SHARED, "nvkm", pci);
 	if (ret)
 		return ret;
@@ -102,6 +123,7 @@ static void *
 nvkm_pci_dtor(struct nvkm_subdev *subdev)
 {
 	struct nvkm_pci *pci = nvkm_pci(subdev);
+	nvkm_agp_dtor(pci);
 	if (pci->msi)
 		pci_disable_msi(pci->pdev);
 	return nvkm_pci(subdev);
@@ -110,6 +132,7 @@ nvkm_pci_dtor(struct nvkm_subdev *subdev)
 static const struct nvkm_subdev_func
 nvkm_pci_func = {
 	.dtor = nvkm_pci_dtor,
+	.preinit = nvkm_pci_preinit,
 	.init = nvkm_pci_init,
 	.fini = nvkm_pci_fini,
 };
@@ -127,6 +150,9 @@ nvkm_pci_new_(const struct nvkm_pci_func *func, struct nvkm_device *device,
 	pci->pdev = device->func->pci(device)->pdev;
 	pci->irq = -1;
 
+	if (device->type == NVKM_DEVICE_AGP)
+		nvkm_agp_ctor(pci);
+
 	switch (pci->pdev->device & 0x0ff0) {
 	case 0x00f0:
 	case 0x02e0: