drm/nouveau: Add DRM driver for NVIDIA GPUs

This adds a drm/kms staging non-API stable driver for GPUs from NVIDIA.

This driver is a KMS-based driver and requires a compatible nouveau
userspace libdrm and nouveau X.org driver.

This driver requires firmware files not available in this kernel tree,
interested parties can find them via the nouveau project git archive.

This driver is reverse engineered, and is in no way supported by nVidia.

Support for nearly the complete range of nvidia hw from nv04->g80 (nv50)
is available, and the kms driver should support driving nearly all
output types (displayport is under development still) along with supporting
suspend/resume.

This work is all from the upstream nouveau project found at
nouveau.freedesktop.org.

The original authors list from nouveau git tree is:
Anssi Hannula <anssi.hannula@iki.fi>
Ben Skeggs <bskeggs@redhat.com>
Francisco Jerez <currojerez@riseup.net>
Maarten Maathuis <madman2003@gmail.com>
Marcin Kościelnicki <koriakin@0x04.net>
Matthew Garrett <mjg@redhat.com>
Matt Parnell <mparnell@gmail.com>
Patrice Mandin <patmandin@gmail.com>
Pekka Paalanen <pq@iki.fi>
Xavier Chantry <shiningxc@gmail.com>
along with project founder Stephane Marchesin <marchesin@icps.u-strasbg.fr>

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

1 files changed, 494 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nv50_fifo.c b/drivers/gpu/drm/nouveau/nv50_fifo.c
new file mode 100644
index 000000000000..77ae1aaa0bce
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nv50_fifo.c
@@ -0,0 +1,494 @@
+/*
+ * Copyright (C) 2007 Ben Skeggs.
+ * All Rights Reserved.
+ *
+ * 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 (including the
+ * next paragraph) 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 OWNER(S) AND/OR ITS SUPPLIERS 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 "drmP.h"
+#include "drm.h"
+#include "nouveau_drv.h"
+
+struct nv50_fifo_priv {
+        struct nouveau_gpuobj_ref *thingo[2];
+        int cur_thingo;
+};
+
+#define IS_G80 ((dev_priv->chipset & 0xf0) == 0x50)
+
+static void
+nv50_fifo_init_thingo(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nv50_fifo_priv *priv = dev_priv->engine.fifo.priv;
+        struct nouveau_gpuobj_ref *cur;
+        int i, nr;
+
+        NV_DEBUG(dev, "\n");
+
+        cur = priv->thingo[priv->cur_thingo];
+        priv->cur_thingo = !priv->cur_thingo;
+
+        /* We never schedule channel 0 or 127 */
+        dev_priv->engine.instmem.prepare_access(dev, true);
+        for (i = 1, nr = 0; i < 127; i++) {
+                if (dev_priv->fifos[i] && dev_priv->fifos[i]->ramfc)
+                        nv_wo32(dev, cur->gpuobj, nr++, i);
+        }
+        dev_priv->engine.instmem.finish_access(dev);
+
+        nv_wr32(dev, 0x32f4, cur->instance >> 12);
+        nv_wr32(dev, 0x32ec, nr);
+        nv_wr32(dev, 0x2500, 0x101);
+}
+
+static int
+nv50_fifo_channel_enable(struct drm_device *dev, int channel, bool nt)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_channel *chan = dev_priv->fifos[channel];
+        uint32_t inst;
+
+        NV_DEBUG(dev, "ch%d\n", channel);
+
+        if (!chan->ramfc)
+                return -EINVAL;
+
+        if (IS_G80)
+                inst = chan->ramfc->instance >> 12;
+        else
+                inst = chan->ramfc->instance >> 8;
+        nv_wr32(dev, NV50_PFIFO_CTX_TABLE(channel),
+                 inst | NV50_PFIFO_CTX_TABLE_CHANNEL_ENABLED);
+
+        if (!nt)
+                nv50_fifo_init_thingo(dev);
+        return 0;
+}
+
+static void
+nv50_fifo_channel_disable(struct drm_device *dev, int channel, bool nt)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        uint32_t inst;
+
+        NV_DEBUG(dev, "ch%d, nt=%d\n", channel, nt);
+
+        if (IS_G80)
+                inst = NV50_PFIFO_CTX_TABLE_INSTANCE_MASK_G80;
+        else
+                inst = NV50_PFIFO_CTX_TABLE_INSTANCE_MASK_G84;
+        nv_wr32(dev, NV50_PFIFO_CTX_TABLE(channel), inst);
+
+        if (!nt)
+                nv50_fifo_init_thingo(dev);
+}
+
+static void
+nv50_fifo_init_reset(struct drm_device *dev)
+{
+        uint32_t pmc_e = NV_PMC_ENABLE_PFIFO;
+
+        NV_DEBUG(dev, "\n");
+
+        nv_wr32(dev, NV03_PMC_ENABLE, nv_rd32(dev, NV03_PMC_ENABLE) & ~pmc_e);
+        nv_wr32(dev, NV03_PMC_ENABLE, nv_rd32(dev, NV03_PMC_ENABLE) |  pmc_e);
+}
+
+static void
+nv50_fifo_init_intr(struct drm_device *dev)
+{
+        NV_DEBUG(dev, "\n");
+
+        nv_wr32(dev, NV03_PFIFO_INTR_0, 0xFFFFFFFF);
+        nv_wr32(dev, NV03_PFIFO_INTR_EN_0, 0xFFFFFFFF);
+}
+
+static void
+nv50_fifo_init_context_table(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        int i;
+
+        NV_DEBUG(dev, "\n");
+
+        for (i = 0; i < NV50_PFIFO_CTX_TABLE__SIZE; i++) {
+                if (dev_priv->fifos[i])
+                        nv50_fifo_channel_enable(dev, i, true);
+                else
+                        nv50_fifo_channel_disable(dev, i, true);
+        }
+
+        nv50_fifo_init_thingo(dev);
+}
+
+static void
+nv50_fifo_init_regs__nv(struct drm_device *dev)
+{
+        NV_DEBUG(dev, "\n");
+
+        nv_wr32(dev, 0x250c, 0x6f3cfc34);
+}
+
+static void
+nv50_fifo_init_regs(struct drm_device *dev)
+{
+        NV_DEBUG(dev, "\n");
+
+        nv_wr32(dev, 0x2500, 0);
+        nv_wr32(dev, 0x3250, 0);
+        nv_wr32(dev, 0x3220, 0);
+        nv_wr32(dev, 0x3204, 0);
+        nv_wr32(dev, 0x3210, 0);
+        nv_wr32(dev, 0x3270, 0);
+
+        /* Enable dummy channels setup by nv50_instmem.c */
+        nv50_fifo_channel_enable(dev, 0, true);
+        nv50_fifo_channel_enable(dev, 127, true);
+}
+
+int
+nv50_fifo_init(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nv50_fifo_priv *priv;
+        int ret;
+
+        NV_DEBUG(dev, "\n");
+
+        priv = dev_priv->engine.fifo.priv;
+        if (priv) {
+                priv->cur_thingo = !priv->cur_thingo;
+                goto just_reset;
+        }
+
+        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+        dev_priv->engine.fifo.priv = priv;
+
+        ret = nouveau_gpuobj_new_ref(dev, NULL, NULL, 0, 128*4, 0x1000,
+                                     NVOBJ_FLAG_ZERO_ALLOC, &priv->thingo[0]);
+        if (ret) {
+                NV_ERROR(dev, "error creating thingo0: %d\n", ret);
+                return ret;
+        }
+
+        ret = nouveau_gpuobj_new_ref(dev, NULL, NULL, 0, 128*4, 0x1000,
+                                     NVOBJ_FLAG_ZERO_ALLOC, &priv->thingo[1]);
+        if (ret) {
+                NV_ERROR(dev, "error creating thingo1: %d\n", ret);
+                return ret;
+        }
+
+just_reset:
+        nv50_fifo_init_reset(dev);
+        nv50_fifo_init_intr(dev);
+        nv50_fifo_init_context_table(dev);
+        nv50_fifo_init_regs__nv(dev);
+        nv50_fifo_init_regs(dev);
+        dev_priv->engine.fifo.enable(dev);
+        dev_priv->engine.fifo.reassign(dev, true);
+
+        return 0;
+}
+
+void
+nv50_fifo_takedown(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nv50_fifo_priv *priv = dev_priv->engine.fifo.priv;
+
+        NV_DEBUG(dev, "\n");
+
+        if (!priv)
+                return;
+
+        nouveau_gpuobj_ref_del(dev, &priv->thingo[0]);
+        nouveau_gpuobj_ref_del(dev, &priv->thingo[1]);
+
+        dev_priv->engine.fifo.priv = NULL;
+        kfree(priv);
+}
+
+int
+nv50_fifo_channel_id(struct drm_device *dev)
+{
+        return nv_rd32(dev, NV03_PFIFO_CACHE1_PUSH1) &
+                        NV50_PFIFO_CACHE1_PUSH1_CHID_MASK;
+}
+
+int
+nv50_fifo_create_context(struct nouveau_channel *chan)
+{
+        struct drm_device *dev = chan->dev;
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_gpuobj *ramfc = NULL;
+        int ret;
+
+        NV_DEBUG(dev, "ch%d\n", chan->id);
+
+        if (IS_G80) {
+                uint32_t ramin_poffset = chan->ramin->gpuobj->im_pramin->start;
+                uint32_t ramin_voffset = chan->ramin->gpuobj->im_backing_start;
+
+                ret = nouveau_gpuobj_new_fake(dev, ramin_poffset, ramin_voffset,
+                                              0x100, NVOBJ_FLAG_ZERO_ALLOC |
+                                              NVOBJ_FLAG_ZERO_FREE, &ramfc,
+                                              &chan->ramfc);
+                if (ret)
+                        return ret;
+
+                ret = nouveau_gpuobj_new_fake(dev, ramin_poffset + 0x0400,
+                                              ramin_voffset + 0x0400, 4096,
+                                              0, NULL, &chan->cache);
+                if (ret)
+                        return ret;
+        } else {
+                ret = nouveau_gpuobj_new_ref(dev, chan, NULL, 0, 0x100, 256,
+                                             NVOBJ_FLAG_ZERO_ALLOC |
+                                             NVOBJ_FLAG_ZERO_FREE,
+                                             &chan->ramfc);
+                if (ret)
+                        return ret;
+                ramfc = chan->ramfc->gpuobj;
+
+                ret = nouveau_gpuobj_new_ref(dev, chan, NULL, 0, 4096, 256,
+                                             0, &chan->cache);
+                if (ret)
+                        return ret;
+        }
+
+        dev_priv->engine.instmem.prepare_access(dev, true);
+
+        nv_wo32(dev, ramfc, 0x08/4, chan->pushbuf_base);
+        nv_wo32(dev, ramfc, 0x10/4, chan->pushbuf_base);
+        nv_wo32(dev, ramfc, 0x48/4, chan->pushbuf->instance >> 4);
+        nv_wo32(dev, ramfc, 0x80/4, (0xc << 24) | (chan->ramht->instance >> 4));
+        nv_wo32(dev, ramfc, 0x3c/4, 0x00086078);
+        nv_wo32(dev, ramfc, 0x44/4, 0x2101ffff);
+        nv_wo32(dev, ramfc, 0x60/4, 0x7fffffff);
+        nv_wo32(dev, ramfc, 0x40/4, 0x00000000);
+        nv_wo32(dev, ramfc, 0x7c/4, 0x30000001);
+        nv_wo32(dev, ramfc, 0x78/4, 0x00000000);
+        nv_wo32(dev, ramfc, 0x4c/4, 0xffffffff);
+
+        if (!IS_G80) {
+                nv_wo32(dev, chan->ramin->gpuobj, 0, chan->id);
+                nv_wo32(dev, chan->ramin->gpuobj, 1,
+                                                chan->ramfc->instance >> 8);
+
+                nv_wo32(dev, ramfc, 0x88/4, chan->cache->instance >> 10);
+                nv_wo32(dev, ramfc, 0x98/4, chan->ramin->instance >> 12);
+        }
+
+        dev_priv->engine.instmem.finish_access(dev);
+
+        ret = nv50_fifo_channel_enable(dev, chan->id, false);
+        if (ret) {
+                NV_ERROR(dev, "error enabling ch%d: %d\n", chan->id, ret);
+                nouveau_gpuobj_ref_del(dev, &chan->ramfc);
+                return ret;
+        }
+
+        return 0;
+}
+
+void
+nv50_fifo_destroy_context(struct nouveau_channel *chan)
+{
+        struct drm_device *dev = chan->dev;
+
+        NV_DEBUG(dev, "ch%d\n", chan->id);
+
+        nouveau_gpuobj_ref_del(dev, &chan->ramfc);
+        nouveau_gpuobj_ref_del(dev, &chan->cache);
+
+        nv50_fifo_channel_disable(dev, chan->id, false);
+
+        /* Dummy channel, also used on ch 127 */
+        if (chan->id == 0)
+                nv50_fifo_channel_disable(dev, 127, false);
+}
+
+int
+nv50_fifo_load_context(struct nouveau_channel *chan)
+{
+        struct drm_device *dev = chan->dev;
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_gpuobj *ramfc = chan->ramfc->gpuobj;
+        struct nouveau_gpuobj *cache = chan->cache->gpuobj;
+        int ptr, cnt;
+
+        NV_DEBUG(dev, "ch%d\n", chan->id);
+
+        dev_priv->engine.instmem.prepare_access(dev, false);
+
+        nv_wr32(dev, 0x3330, nv_ro32(dev, ramfc, 0x00/4));
+        nv_wr32(dev, 0x3334, nv_ro32(dev, ramfc, 0x04/4));
+        nv_wr32(dev, 0x3240, nv_ro32(dev, ramfc, 0x08/4));
+        nv_wr32(dev, 0x3320, nv_ro32(dev, ramfc, 0x0c/4));
+        nv_wr32(dev, 0x3244, nv_ro32(dev, ramfc, 0x10/4));
+        nv_wr32(dev, 0x3328, nv_ro32(dev, ramfc, 0x14/4));
+        nv_wr32(dev, 0x3368, nv_ro32(dev, ramfc, 0x18/4));
+        nv_wr32(dev, 0x336c, nv_ro32(dev, ramfc, 0x1c/4));
+        nv_wr32(dev, 0x3370, nv_ro32(dev, ramfc, 0x20/4));
+        nv_wr32(dev, 0x3374, nv_ro32(dev, ramfc, 0x24/4));
+        nv_wr32(dev, 0x3378, nv_ro32(dev, ramfc, 0x28/4));
+        nv_wr32(dev, 0x337c, nv_ro32(dev, ramfc, 0x2c/4));
+        nv_wr32(dev, 0x3228, nv_ro32(dev, ramfc, 0x30/4));
+        nv_wr32(dev, 0x3364, nv_ro32(dev, ramfc, 0x34/4));
+        nv_wr32(dev, 0x32a0, nv_ro32(dev, ramfc, 0x38/4));
+        nv_wr32(dev, 0x3224, nv_ro32(dev, ramfc, 0x3c/4));
+        nv_wr32(dev, 0x324c, nv_ro32(dev, ramfc, 0x40/4));
+        nv_wr32(dev, 0x2044, nv_ro32(dev, ramfc, 0x44/4));
+        nv_wr32(dev, 0x322c, nv_ro32(dev, ramfc, 0x48/4));
+        nv_wr32(dev, 0x3234, nv_ro32(dev, ramfc, 0x4c/4));
+        nv_wr32(dev, 0x3340, nv_ro32(dev, ramfc, 0x50/4));
+        nv_wr32(dev, 0x3344, nv_ro32(dev, ramfc, 0x54/4));
+        nv_wr32(dev, 0x3280, nv_ro32(dev, ramfc, 0x58/4));
+        nv_wr32(dev, 0x3254, nv_ro32(dev, ramfc, 0x5c/4));
+        nv_wr32(dev, 0x3260, nv_ro32(dev, ramfc, 0x60/4));
+        nv_wr32(dev, 0x3264, nv_ro32(dev, ramfc, 0x64/4));
+        nv_wr32(dev, 0x3268, nv_ro32(dev, ramfc, 0x68/4));
+        nv_wr32(dev, 0x326c, nv_ro32(dev, ramfc, 0x6c/4));
+        nv_wr32(dev, 0x32e4, nv_ro32(dev, ramfc, 0x70/4));
+        nv_wr32(dev, 0x3248, nv_ro32(dev, ramfc, 0x74/4));
+        nv_wr32(dev, 0x2088, nv_ro32(dev, ramfc, 0x78/4));
+        nv_wr32(dev, 0x2058, nv_ro32(dev, ramfc, 0x7c/4));
+        nv_wr32(dev, 0x2210, nv_ro32(dev, ramfc, 0x80/4));
+
+        cnt = nv_ro32(dev, ramfc, 0x84/4);
+        for (ptr = 0; ptr < cnt; ptr++) {
+                nv_wr32(dev, NV40_PFIFO_CACHE1_METHOD(ptr),
+                        nv_ro32(dev, cache, (ptr * 2) + 0));
+                nv_wr32(dev, NV40_PFIFO_CACHE1_DATA(ptr),
+                        nv_ro32(dev, cache, (ptr * 2) + 1));
+        }
+        nv_wr32(dev, 0x3210, cnt << 2);
+        nv_wr32(dev, 0x3270, 0);
+
+        /* guessing that all the 0x34xx regs aren't on NV50 */
+        if (!IS_G80) {
+                nv_wr32(dev, 0x340c, nv_ro32(dev, ramfc, 0x88/4));
+                nv_wr32(dev, 0x3400, nv_ro32(dev, ramfc, 0x8c/4));
+                nv_wr32(dev, 0x3404, nv_ro32(dev, ramfc, 0x90/4));
+                nv_wr32(dev, 0x3408, nv_ro32(dev, ramfc, 0x94/4));
+                nv_wr32(dev, 0x3410, nv_ro32(dev, ramfc, 0x98/4));
+        }
+
+        dev_priv->engine.instmem.finish_access(dev);
+
+        nv_wr32(dev, NV03_PFIFO_CACHE1_GET, 0);
+        nv_wr32(dev, NV03_PFIFO_CACHE1_PUT, 0);
+        nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH1, chan->id | (1<<16));
+        return 0;
+}
+
+int
+nv50_fifo_unload_context(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
+        struct nouveau_gpuobj *ramfc, *cache;
+        struct nouveau_channel *chan = NULL;
+        int chid, get, put, ptr;
+
+        NV_DEBUG(dev, "\n");
+
+        chid = pfifo->channel_id(dev);
+        if (chid < 0 || chid >= dev_priv->engine.fifo.channels)
+                return 0;
+
+        chan = dev_priv->fifos[chid];
+        if (!chan) {
+                NV_ERROR(dev, "Inactive channel on PFIFO: %d\n", chid);
+                return -EINVAL;
+        }
+        NV_DEBUG(dev, "ch%d\n", chan->id);
+        ramfc = chan->ramfc->gpuobj;
+        cache = chan->cache->gpuobj;
+
+        dev_priv->engine.instmem.prepare_access(dev, true);
+
+        nv_wo32(dev, ramfc, 0x00/4, nv_rd32(dev, 0x3330));
+        nv_wo32(dev, ramfc, 0x04/4, nv_rd32(dev, 0x3334));
+        nv_wo32(dev, ramfc, 0x08/4, nv_rd32(dev, 0x3240));
+        nv_wo32(dev, ramfc, 0x0c/4, nv_rd32(dev, 0x3320));
+        nv_wo32(dev, ramfc, 0x10/4, nv_rd32(dev, 0x3244));
+        nv_wo32(dev, ramfc, 0x14/4, nv_rd32(dev, 0x3328));
+        nv_wo32(dev, ramfc, 0x18/4, nv_rd32(dev, 0x3368));
+        nv_wo32(dev, ramfc, 0x1c/4, nv_rd32(dev, 0x336c));
+        nv_wo32(dev, ramfc, 0x20/4, nv_rd32(dev, 0x3370));
+        nv_wo32(dev, ramfc, 0x24/4, nv_rd32(dev, 0x3374));
+        nv_wo32(dev, ramfc, 0x28/4, nv_rd32(dev, 0x3378));
+        nv_wo32(dev, ramfc, 0x2c/4, nv_rd32(dev, 0x337c));
+        nv_wo32(dev, ramfc, 0x30/4, nv_rd32(dev, 0x3228));
+        nv_wo32(dev, ramfc, 0x34/4, nv_rd32(dev, 0x3364));
+        nv_wo32(dev, ramfc, 0x38/4, nv_rd32(dev, 0x32a0));
+        nv_wo32(dev, ramfc, 0x3c/4, nv_rd32(dev, 0x3224));
+        nv_wo32(dev, ramfc, 0x40/4, nv_rd32(dev, 0x324c));
+        nv_wo32(dev, ramfc, 0x44/4, nv_rd32(dev, 0x2044));
+        nv_wo32(dev, ramfc, 0x48/4, nv_rd32(dev, 0x322c));
+        nv_wo32(dev, ramfc, 0x4c/4, nv_rd32(dev, 0x3234));
+        nv_wo32(dev, ramfc, 0x50/4, nv_rd32(dev, 0x3340));
+        nv_wo32(dev, ramfc, 0x54/4, nv_rd32(dev, 0x3344));
+        nv_wo32(dev, ramfc, 0x58/4, nv_rd32(dev, 0x3280));
+        nv_wo32(dev, ramfc, 0x5c/4, nv_rd32(dev, 0x3254));
+        nv_wo32(dev, ramfc, 0x60/4, nv_rd32(dev, 0x3260));
+        nv_wo32(dev, ramfc, 0x64/4, nv_rd32(dev, 0x3264));
+        nv_wo32(dev, ramfc, 0x68/4, nv_rd32(dev, 0x3268));
+        nv_wo32(dev, ramfc, 0x6c/4, nv_rd32(dev, 0x326c));
+        nv_wo32(dev, ramfc, 0x70/4, nv_rd32(dev, 0x32e4));
+        nv_wo32(dev, ramfc, 0x74/4, nv_rd32(dev, 0x3248));
+        nv_wo32(dev, ramfc, 0x78/4, nv_rd32(dev, 0x2088));
+        nv_wo32(dev, ramfc, 0x7c/4, nv_rd32(dev, 0x2058));
+        nv_wo32(dev, ramfc, 0x80/4, nv_rd32(dev, 0x2210));
+
+        put = (nv_rd32(dev, NV03_PFIFO_CACHE1_PUT) & 0x7ff) >> 2;
+        get = (nv_rd32(dev, NV03_PFIFO_CACHE1_GET) & 0x7ff) >> 2;
+        ptr = 0;
+        while (put != get) {
+                nv_wo32(dev, cache, ptr++,
+                            nv_rd32(dev, NV40_PFIFO_CACHE1_METHOD(get)));
+                nv_wo32(dev, cache, ptr++,
+                            nv_rd32(dev, NV40_PFIFO_CACHE1_DATA(get)));
+                get = (get + 1) & 0x1ff;
+        }
+
+        /* guessing that all the 0x34xx regs aren't on NV50 */
+        if (!IS_G80) {
+                nv_wo32(dev, ramfc, 0x84/4, ptr >> 1);
+                nv_wo32(dev, ramfc, 0x88/4, nv_rd32(dev, 0x340c));
+                nv_wo32(dev, ramfc, 0x8c/4, nv_rd32(dev, 0x3400));
+                nv_wo32(dev, ramfc, 0x90/4, nv_rd32(dev, 0x3404));
+                nv_wo32(dev, ramfc, 0x94/4, nv_rd32(dev, 0x3408));
+                nv_wo32(dev, ramfc, 0x98/4, nv_rd32(dev, 0x3410));
+        }
+
+        dev_priv->engine.instmem.finish_access(dev);
+
+        /*XXX: probably reload ch127 (NULL) state back too */
+        nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH1, 127);
+        return 0;
+}
+