drm/nouveau/bus: add interfaces/helpers for sequencer

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

9 files changed, 371 insertions, 15 deletions

diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
index fbe33ed5f6cf..3859958581c2 100644
--- a/drivers/gpu/drm/nouveau/Makefile
+++ b/drivers/gpu/drm/nouveau/Makefile
@@ -44,6 +44,7 @@ nouveau-y += core/subdev/bios/xpio.o
 nouveau-y += core/subdev/bus/nv04.o
 nouveau-y += core/subdev/bus/nv31.o
 nouveau-y += core/subdev/bus/nv50.o
+nouveau-y += core/subdev/bus/nv94.o
 nouveau-y += core/subdev/bus/nvc0.o
 nouveau-y += core/subdev/clock/nv04.o
 nouveau-y += core/subdev/clock/nv40.o
diff --git a/drivers/gpu/drm/nouveau/core/engine/device/nv50.c b/drivers/gpu/drm/nouveau/core/engine/device/nv50.c
index cb6039c01a67..f44a2baecc79 100644
--- a/drivers/gpu/drm/nouveau/core/engine/device/nv50.c
+++ b/drivers/gpu/drm/nouveau/core/engine/device/nv50.c
@@ -166,7 +166,7 @@ nv50_identify(struct nouveau_device *device)
 		device->oclass[NVDEV_SUBDEV_MXM    ] = &nv50_mxm_oclass;
 		device->oclass[NVDEV_SUBDEV_DEVINIT] = &nv50_devinit_oclass;
 		device->oclass[NVDEV_SUBDEV_MC     ] =  nv94_mc_oclass;
-		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv50_bus_oclass;
+		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv94_bus_oclass;
 		device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
 		device->oclass[NVDEV_SUBDEV_FB     ] =  nv84_fb_oclass;
 		device->oclass[NVDEV_SUBDEV_INSTMEM] = &nv50_instmem_oclass;
@@ -192,7 +192,7 @@ nv50_identify(struct nouveau_device *device)
 		device->oclass[NVDEV_SUBDEV_MXM    ] = &nv50_mxm_oclass;
 		device->oclass[NVDEV_SUBDEV_DEVINIT] = &nv50_devinit_oclass;
 		device->oclass[NVDEV_SUBDEV_MC     ] =  nv94_mc_oclass;
-		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv50_bus_oclass;
+		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv94_bus_oclass;
 		device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
 		device->oclass[NVDEV_SUBDEV_FB     ] =  nv84_fb_oclass;
 		device->oclass[NVDEV_SUBDEV_INSTMEM] = &nv50_instmem_oclass;
@@ -218,7 +218,7 @@ nv50_identify(struct nouveau_device *device)
 		device->oclass[NVDEV_SUBDEV_MXM    ] = &nv50_mxm_oclass;
 		device->oclass[NVDEV_SUBDEV_DEVINIT] = &nv50_devinit_oclass;
 		device->oclass[NVDEV_SUBDEV_MC     ] =  nv98_mc_oclass;
-		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv50_bus_oclass;
+		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv94_bus_oclass;
 		device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
 		device->oclass[NVDEV_SUBDEV_FB     ] =  nv84_fb_oclass;
 		device->oclass[NVDEV_SUBDEV_INSTMEM] = &nv50_instmem_oclass;
@@ -244,7 +244,7 @@ nv50_identify(struct nouveau_device *device)
 		device->oclass[NVDEV_SUBDEV_MXM    ] = &nv50_mxm_oclass;
 		device->oclass[NVDEV_SUBDEV_DEVINIT] = &nv50_devinit_oclass;
 		device->oclass[NVDEV_SUBDEV_MC     ] =  nv98_mc_oclass;
-		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv50_bus_oclass;
+		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv94_bus_oclass;
 		device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
 		device->oclass[NVDEV_SUBDEV_FB     ] =  nv84_fb_oclass;
 		device->oclass[NVDEV_SUBDEV_INSTMEM] = &nv50_instmem_oclass;
@@ -270,7 +270,7 @@ nv50_identify(struct nouveau_device *device)
 		device->oclass[NVDEV_SUBDEV_MXM    ] = &nv50_mxm_oclass;
 		device->oclass[NVDEV_SUBDEV_DEVINIT] = &nv50_devinit_oclass;
 		device->oclass[NVDEV_SUBDEV_MC     ] =  nv98_mc_oclass;
-		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv50_bus_oclass;
+		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv94_bus_oclass;
 		device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
 		device->oclass[NVDEV_SUBDEV_FB     ] =  nvaa_fb_oclass;
 		device->oclass[NVDEV_SUBDEV_INSTMEM] = &nv50_instmem_oclass;
@@ -296,7 +296,7 @@ nv50_identify(struct nouveau_device *device)
 		device->oclass[NVDEV_SUBDEV_MXM    ] = &nv50_mxm_oclass;
 		device->oclass[NVDEV_SUBDEV_DEVINIT] = &nv50_devinit_oclass;
 		device->oclass[NVDEV_SUBDEV_MC     ] =  nv98_mc_oclass;
-		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv50_bus_oclass;
+		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv94_bus_oclass;
 		device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
 		device->oclass[NVDEV_SUBDEV_FB     ] =  nvaa_fb_oclass;
 		device->oclass[NVDEV_SUBDEV_INSTMEM] = &nv50_instmem_oclass;
@@ -322,7 +322,7 @@ nv50_identify(struct nouveau_device *device)
 		device->oclass[NVDEV_SUBDEV_MXM    ] = &nv50_mxm_oclass;
 		device->oclass[NVDEV_SUBDEV_DEVINIT] = &nva3_devinit_oclass;
 		device->oclass[NVDEV_SUBDEV_MC     ] =  nv98_mc_oclass;
-		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv50_bus_oclass;
+		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv94_bus_oclass;
 		device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
 		device->oclass[NVDEV_SUBDEV_FB     ] =  nva3_fb_oclass;
 		device->oclass[NVDEV_SUBDEV_INSTMEM] = &nv50_instmem_oclass;
@@ -350,7 +350,7 @@ nv50_identify(struct nouveau_device *device)
 		device->oclass[NVDEV_SUBDEV_MXM    ] = &nv50_mxm_oclass;
 		device->oclass[NVDEV_SUBDEV_DEVINIT] = &nva3_devinit_oclass;
 		device->oclass[NVDEV_SUBDEV_MC     ] =  nv98_mc_oclass;
-		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv50_bus_oclass;
+		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv94_bus_oclass;
 		device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
 		device->oclass[NVDEV_SUBDEV_FB     ] =  nva3_fb_oclass;
 		device->oclass[NVDEV_SUBDEV_INSTMEM] = &nv50_instmem_oclass;
@@ -377,7 +377,7 @@ nv50_identify(struct nouveau_device *device)
 		device->oclass[NVDEV_SUBDEV_MXM    ] = &nv50_mxm_oclass;
 		device->oclass[NVDEV_SUBDEV_DEVINIT] = &nva3_devinit_oclass;
 		device->oclass[NVDEV_SUBDEV_MC     ] =  nv98_mc_oclass;
-		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv50_bus_oclass;
+		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv94_bus_oclass;
 		device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
 		device->oclass[NVDEV_SUBDEV_FB     ] =  nva3_fb_oclass;
 		device->oclass[NVDEV_SUBDEV_INSTMEM] = &nv50_instmem_oclass;
@@ -404,7 +404,7 @@ nv50_identify(struct nouveau_device *device)
 		device->oclass[NVDEV_SUBDEV_MXM    ] = &nv50_mxm_oclass;
 		device->oclass[NVDEV_SUBDEV_DEVINIT] = &nva3_devinit_oclass;
 		device->oclass[NVDEV_SUBDEV_MC     ] =  nv98_mc_oclass;
-		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv50_bus_oclass;
+		device->oclass[NVDEV_SUBDEV_BUS    ] =  nv94_bus_oclass;
 		device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
 		device->oclass[NVDEV_SUBDEV_FB     ] =  nvaf_fb_oclass;
 		device->oclass[NVDEV_SUBDEV_INSTMEM] = &nv50_instmem_oclass;
diff --git a/drivers/gpu/drm/nouveau/core/include/subdev/bus.h b/drivers/gpu/drm/nouveau/core/include/subdev/bus.h
index 837401d41e7d..697f7ce70aab 100644
--- a/drivers/gpu/drm/nouveau/core/include/subdev/bus.h
+++ b/drivers/gpu/drm/nouveau/core/include/subdev/bus.h
@@ -11,6 +11,8 @@ struct nouveau_bus_intr {
 
 struct nouveau_bus {
 	struct nouveau_subdev base;
+	int (*hwsq_exec)(struct nouveau_bus *, u32 *, u32);
+	u32 hwsq_size;
 };
 
 static inline struct nouveau_bus *
@@ -36,6 +38,16 @@ nouveau_bus(void *obj)
 extern struct nouveau_oclass *nv04_bus_oclass;
 extern struct nouveau_oclass *nv31_bus_oclass;
 extern struct nouveau_oclass *nv50_bus_oclass;
+extern struct nouveau_oclass *nv94_bus_oclass;
 extern struct nouveau_oclass *nvc0_bus_oclass;
 
+/* interface to sequencer */
+struct nouveau_hwsq;
+int  nouveau_hwsq_init(struct nouveau_bus *, struct nouveau_hwsq **);
+int  nouveau_hwsq_fini(struct nouveau_hwsq **, bool exec);
+void nouveau_hwsq_wr32(struct nouveau_hwsq *, u32 addr, u32 data);
+void nouveau_hwsq_setf(struct nouveau_hwsq *, u8 flag, int data);
+void nouveau_hwsq_wait(struct nouveau_hwsq *, u8 flag, u8 data);
+void nouveau_hwsq_nsec(struct nouveau_hwsq *, u32 nsec);
+
 #endif
diff --git a/drivers/gpu/drm/nouveau/core/subdev/bus/hwsq.c b/drivers/gpu/drm/nouveau/core/subdev/bus/hwsq.c
new file mode 100644
index 000000000000..f757470e2284
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/bus/hwsq.c
@@ -0,0 +1,145 @@
+/*
+ * Copyright 2013 Red Hat Inc.
+ *
+ * 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.
+ *
+ * Authors: Ben Skeggs <bskeggs@redhat.com>
+ */
+
+#include <subdev/timer.h>
+#include <subdev/bus.h>
+
+struct nouveau_hwsq {
+	struct nouveau_bus *pbus;
+	u32 addr;
+	u32 data;
+	struct {
+		u8 data[512];
+		u8 size;
+	} c;
+};
+
+static void
+hwsq_cmd(struct nouveau_hwsq *hwsq, int size, u8 data[])
+{
+	memcpy(&hwsq->c.data[hwsq->c.size], data, size * sizeof(data[0]));
+	hwsq->c.size += size;
+}
+
+int
+nouveau_hwsq_init(struct nouveau_bus *pbus, struct nouveau_hwsq **phwsq)
+{
+	struct nouveau_hwsq *hwsq;
+
+	hwsq = *phwsq = kmalloc(sizeof(*hwsq), GFP_KERNEL);
+	if (hwsq) {
+		hwsq->pbus = pbus;
+		hwsq->addr = ~0;
+		hwsq->data = ~0;
+		memset(hwsq->c.data, 0x7f, sizeof(hwsq->c.data));
+		hwsq->c.size = 0;
+	}
+
+	return hwsq ? 0 : -ENOMEM;
+}
+
+int
+nouveau_hwsq_fini(struct nouveau_hwsq **phwsq, bool exec)
+{
+	struct nouveau_hwsq *hwsq = *phwsq;
+	int ret = 0, i;
+	if (hwsq) {
+		struct nouveau_bus *pbus = hwsq->pbus;
+		hwsq->c.size = (hwsq->c.size + 4) / 4;
+		if (hwsq->c.size <= pbus->hwsq_size) {
+			if (exec)
+				ret = pbus->hwsq_exec(pbus, (u32 *)hwsq->c.data,
+						      hwsq->c.size);
+			if (ret)
+				nv_error(pbus, "hwsq exec failed: %d\n", ret);
+		} else {
+			nv_error(pbus, "hwsq ucode too large\n");
+			ret = -ENOSPC;
+		}
+
+		for (i = 0; ret && i < hwsq->c.size; i++)
+			nv_error(pbus, "\t0x%08x\n", ((u32 *)hwsq->c.data)[i]);
+
+		*phwsq = NULL;
+		kfree(hwsq);
+	}
+	return ret;
+}
+
+void
+nouveau_hwsq_wr32(struct nouveau_hwsq *hwsq, u32 addr, u32 data)
+{
+	nv_debug(hwsq->pbus, "R[%06x] = 0x%08x\n", addr, data);
+
+	if (hwsq->data != data) {
+		if ((data & 0xffff0000) != (hwsq->data & 0xffff0000)) {
+			hwsq_cmd(hwsq, 5, (u8[]){ 0xe2, data, data >> 8,
+						  data >> 16, data >> 24 });
+		} else {
+			hwsq_cmd(hwsq, 3, (u8[]){ 0x42, data, data >> 8 });
+		}
+	}
+
+	if ((addr & 0xffff0000) != (hwsq->addr & 0xffff0000)) {
+		hwsq_cmd(hwsq, 5, (u8[]){ 0xe0, addr, addr >> 8,
+					  addr >> 16, addr >> 24 });
+	} else {
+		hwsq_cmd(hwsq, 3, (u8[]){ 0x40, addr, addr >> 8 });
+	}
+
+	hwsq->addr = addr;
+	hwsq->data = data;
+}
+
+void
+nouveau_hwsq_setf(struct nouveau_hwsq *hwsq, u8 flag, int data)
+{
+	nv_debug(hwsq->pbus, " FLAG[%02x] = %d\n", flag, data);
+	flag += 0x80;
+	if (data >= 0)
+		flag += 0x20;
+	if (data >= 1)
+		flag += 0x20;
+	hwsq_cmd(hwsq, 1, (u8[]){ flag });
+}
+
+void
+nouveau_hwsq_wait(struct nouveau_hwsq *hwsq, u8 flag, u8 data)
+{
+	nv_debug(hwsq->pbus, " WAIT[%02x] = %d\n", flag, data);
+	hwsq_cmd(hwsq, 3, (u8[]){ 0x5f, flag, data });
+}
+
+void
+nouveau_hwsq_nsec(struct nouveau_hwsq *hwsq, u32 nsec)
+{
+	u8 shift = 0, usec = nsec / 1000;
+	while (usec & ~3) {
+		usec >>= 2;
+		shift++;
+	}
+
+	nv_debug(hwsq->pbus, "    DELAY = %d ns\n", nsec);
+	hwsq_cmd(hwsq, 1, (u8[]){ 0x00 | (shift << 2) | usec });
+}
diff --git a/drivers/gpu/drm/nouveau/core/subdev/bus/hwsq.h b/drivers/gpu/drm/nouveau/core/subdev/bus/hwsq.h
new file mode 100644
index 000000000000..12176f9c1bc6
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/bus/hwsq.h
@@ -0,0 +1,113 @@
+#ifndef __NVKM_BUS_HWSQ_H__
+#define __NVKM_BUS_HWSQ_H__
+
+#include <subdev/bus.h>
+
+struct hwsq {
+	struct nouveau_subdev *subdev;
+	struct nouveau_hwsq *hwsq;
+	int sequence;
+};
+
+struct hwsq_reg {
+	int sequence;
+	bool force;
+	u32 addr[2];
+	u32 data;
+};
+
+static inline struct hwsq_reg
+hwsq_reg2(u32 addr1, u32 addr2)
+{
+	return (struct hwsq_reg) {
+		.sequence = 0,
+		.force = 0,
+		.addr = { addr1, addr2 },
+		.data = 0xdeadbeef,
+	};
+}
+
+static inline struct hwsq_reg
+hwsq_reg(u32 addr)
+{
+	return hwsq_reg2(addr, addr);
+}
+
+static inline int
+hwsq_init(struct hwsq *ram, struct nouveau_subdev *subdev)
+{
+	struct nouveau_bus *pbus = nouveau_bus(subdev);
+	int ret;
+
+	ret = nouveau_hwsq_init(pbus, &ram->hwsq);
+	if (ret)
+		return ret;
+
+	ram->sequence++;
+	ram->subdev = subdev;
+	return 0;
+}
+
+static inline int
+hwsq_exec(struct hwsq *ram, bool exec)
+{
+	int ret = 0;
+	if (ram->subdev) {
+		ret = nouveau_hwsq_fini(&ram->hwsq, exec);
+		ram->subdev = NULL;
+	}
+	return ret;
+}
+
+static inline u32
+hwsq_rd32(struct hwsq *ram, struct hwsq_reg *reg)
+{
+	if (reg->sequence != ram->sequence)
+		reg->data = nv_rd32(ram->subdev, reg->addr[0]);
+	return reg->data;
+}
+
+static inline void
+hwsq_wr32(struct hwsq *ram, struct hwsq_reg *reg, u32 data)
+{
+	reg->sequence = ram->sequence;
+	reg->data = data;
+	if (reg->addr[0] != reg->addr[1])
+		nouveau_hwsq_wr32(ram->hwsq, reg->addr[1], reg->data);
+	nouveau_hwsq_wr32(ram->hwsq, reg->addr[0], reg->data);
+}
+
+static inline void
+hwsq_nuke(struct hwsq *ram, struct hwsq_reg *reg)
+{
+	reg->force = true;
+}
+
+static inline u32
+hwsq_mask(struct hwsq *ram, struct hwsq_reg *reg, u32 mask, u32 data)
+{
+	u32 temp = hwsq_rd32(ram, reg);
+	if (temp != ((temp & ~mask) | data) || reg->force)
+		hwsq_wr32(ram, reg, (temp & ~mask) | data);
+	return temp;
+}
+
+static inline void
+hwsq_setf(struct hwsq *ram, u8 flag, int data)
+{
+	nouveau_hwsq_setf(ram->hwsq, flag, data);
+}
+
+static inline void
+hwsq_wait(struct hwsq *ram, u8 flag, u8 data)
+{
+	nouveau_hwsq_wait(ram->hwsq, flag, data);
+}
+
+static inline void
+hwsq_nsec(struct hwsq *ram, u32 nsec)
+{
+	nouveau_hwsq_nsec(ram->hwsq, nsec);
+}
+
+#endif
diff --git a/drivers/gpu/drm/nouveau/core/subdev/bus/nv04.c b/drivers/gpu/drm/nouveau/core/subdev/bus/nv04.c
index 478209930dcd..23921b5351db 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/bus/nv04.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bus/nv04.c
@@ -77,6 +77,8 @@ nv04_bus_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 		return ret;
 
 	nv_subdev(priv)->intr = impl->intr;
+	priv->base.hwsq_exec = impl->hwsq_exec;
+	priv->base.hwsq_size = impl->hwsq_size;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/subdev/bus/nv04.h b/drivers/gpu/drm/nouveau/core/subdev/bus/nv04.h
index 0ac589d26a4c..4d7602450a20 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/bus/nv04.h
+++ b/drivers/gpu/drm/nouveau/core/subdev/bus/nv04.h
@@ -7,13 +7,17 @@ struct nv04_bus_priv {
 	struct nouveau_bus base;
 };
 
-int nv04_bus_ctor(struct nouveau_object *, struct nouveau_object *,
-		  struct nouveau_oclass *, void *, u32,
-		  struct nouveau_object **);
+int  nv04_bus_ctor(struct nouveau_object *, struct nouveau_object *,
+		   struct nouveau_oclass *, void *, u32,
+		   struct nouveau_object **);
+int  nv50_bus_init(struct nouveau_object *);
+void nv50_bus_intr(struct nouveau_subdev *);
 
 struct nv04_bus_impl {
 	struct nouveau_oclass base;
 	void (*intr)(struct nouveau_subdev *);
+	int  (*hwsq_exec)(struct nouveau_bus *, u32 *, u32);
+	u32  hwsq_size;
 };
 
 #endif
diff --git a/drivers/gpu/drm/nouveau/core/subdev/bus/nv50.c b/drivers/gpu/drm/nouveau/core/subdev/bus/nv50.c
index cda534790d1d..11918f7e2aca 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/bus/nv50.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bus/nv50.c
@@ -23,9 +23,27 @@
  *          Ben Skeggs
  */
 
+#include <subdev/timer.h>
+
 #include "nv04.h"
 
-static void
+static int
+nv50_bus_hwsq_exec(struct nouveau_bus *pbus, u32 *data, u32 size)
+{
+	struct nv50_bus_priv *priv = (void *)pbus;
+	int i;
+
+	nv_mask(pbus, 0x001098, 0x00000008, 0x00000000);
+	nv_wr32(pbus, 0x001304, 0x00000000);
+	for (i = 0; i < size; i++)
+		nv_wr32(priv, 0x001400 + (i * 4), data[i]);
+	nv_mask(pbus, 0x001098, 0x00000018, 0x00000018);
+	nv_wr32(pbus, 0x00130c, 0x00000003);
+
+	return nv_wait(pbus, 0x001308, 0x00000100, 0x00000000) ? 0 : -ETIMEDOUT;
+}
+
+void
 nv50_bus_intr(struct nouveau_subdev *subdev)
 {
 	struct nouveau_bus *pbus = nouveau_bus(subdev);
@@ -57,7 +75,7 @@ nv50_bus_intr(struct nouveau_subdev *subdev)
 	}
 }
 
-static int
+int
 nv50_bus_init(struct nouveau_object *object)
 {
 	struct nv04_bus_priv *priv = (void *)object;
@@ -82,4 +100,6 @@ nv50_bus_oclass = &(struct nv04_bus_impl) {
 		.fini = _nouveau_bus_fini,
 	},
 	.intr = nv50_bus_intr,
+	.hwsq_exec = nv50_bus_hwsq_exec,
+	.hwsq_size = 64,
 }.base;
diff --git a/drivers/gpu/drm/nouveau/core/subdev/bus/nv94.c b/drivers/gpu/drm/nouveau/core/subdev/bus/nv94.c
new file mode 100644
index 000000000000..d3659055fa4b
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/bus/nv94.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2012 Nouveau Community
+ *
+ * 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.
+ *
+ * Authors: Martin Peres <martin.peres@labri.fr>
+ *          Ben Skeggs
+ */
+
+#include <subdev/timer.h>
+
+#include "nv04.h"
+
+static int
+nv94_bus_hwsq_exec(struct nouveau_bus *pbus, u32 *data, u32 size)
+{
+	struct nv50_bus_priv *priv = (void *)pbus;
+	int i;
+
+	nv_mask(pbus, 0x001098, 0x00000008, 0x00000000);
+	nv_wr32(pbus, 0x001304, 0x00000000);
+	nv_wr32(pbus, 0x001318, 0x00000000);
+	for (i = 0; i < size; i++)
+		nv_wr32(priv, 0x080000 + (i * 4), data[i]);
+	nv_mask(pbus, 0x001098, 0x00000018, 0x00000018);
+	nv_wr32(pbus, 0x00130c, 0x00000001);
+
+	return nv_wait(pbus, 0x001308, 0x00000100, 0x00000000) ? 0 : -ETIMEDOUT;
+}
+
+struct nouveau_oclass *
+nv94_bus_oclass = &(struct nv04_bus_impl) {
+	.base.handle = NV_SUBDEV(BUS, 0x94),
+	.base.ofuncs = &(struct nouveau_ofuncs) {
+		.ctor = nv04_bus_ctor,
+		.dtor = _nouveau_bus_dtor,
+		.init = nv50_bus_init,
+		.fini = _nouveau_bus_fini,
+	},
+	.intr = nv50_bus_intr,
+	.hwsq_exec = nv94_bus_hwsq_exec,
+	.hwsq_size = 128,
+}.base;