[RFC 14/16] drm/nouveau/fb: add GK20A support

[Alexandre Courbot <acourbot@nvidia.com>]

Add a clumsy-but-working FB support for GK20A. This chip only uses system
memory, so we allocate a big chunk using CMA and let the existing memory
managers work on it.

A better future design would be to allocate objects directly from system
memory without having to suffer from the limitations of a large,
contiguous pool.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
---
 drivers/gpu/drm/nouveau/Makefile                 |  2 +
 drivers/gpu/drm/nouveau/core/include/subdev/fb.h |  1 +
 drivers/gpu/drm/nouveau/core/subdev/fb/nvea.c    | 28 ++++++++++
 drivers/gpu/drm/nouveau/core/subdev/fb/priv.h    |  1 +
 drivers/gpu/drm/nouveau/core/subdev/fb/ramnvea.c | 67 ++++++++++++++++++++++++
 5 files changed, 99 insertions(+)
 create mode 100644 drivers/gpu/drm/nouveau/core/subdev/fb/nvea.c
 create mode 100644 drivers/gpu/drm/nouveau/core/subdev/fb/ramnvea.c

diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
index 3548fcd..d9fe3e6 100644
--- a/drivers/gpu/drm/nouveau/Makefile
+++ b/drivers/gpu/drm/nouveau/Makefile
@@ -100,6 +100,7 @@ nouveau-y += core/subdev/fb/nvaa.o
 nouveau-y += core/subdev/fb/nvaf.o
 nouveau-y += core/subdev/fb/nvc0.o
 nouveau-y += core/subdev/fb/nve0.o
+nouveau-y += core/subdev/fb/nvea.o
 nouveau-y += core/subdev/fb/ramnv04.o
 nouveau-y += core/subdev/fb/ramnv10.o
 nouveau-y += core/subdev/fb/ramnv1a.o
@@ -114,6 +115,7 @@ nouveau-y += core/subdev/fb/ramnva3.o
 nouveau-y += core/subdev/fb/ramnvaa.o
 nouveau-y += core/subdev/fb/ramnvc0.o
 nouveau-y += core/subdev/fb/ramnve0.o
+nouveau-y += core/subdev/fb/ramnvea.o
 nouveau-y += core/subdev/fb/sddr3.o
 nouveau-y += core/subdev/fb/gddr5.o
 nouveau-y += core/subdev/gpio/base.o
diff --git a/drivers/gpu/drm/nouveau/core/include/subdev/fb.h b/drivers/gpu/drm/nouveau/core/include/subdev/fb.h
index d7ecafb..3905816 100644
--- a/drivers/gpu/drm/nouveau/core/include/subdev/fb.h
+++ b/drivers/gpu/drm/nouveau/core/include/subdev/fb.h
@@ -105,6 +105,7 @@ extern struct nouveau_oclass *nvaa_fb_oclass;
 extern struct nouveau_oclass *nvaf_fb_oclass;
 extern struct nouveau_oclass *nvc0_fb_oclass;
 extern struct nouveau_oclass *nve0_fb_oclass;
+extern struct nouveau_oclass *nvea_fb_oclass;
 
 #include <subdev/bios/ramcfg.h>
 
diff --git a/drivers/gpu/drm/nouveau/core/subdev/fb/nvea.c b/drivers/gpu/drm/nouveau/core/subdev/fb/nvea.c
new file mode 100644
index 0000000..5ff6029
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/fb/nvea.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2014, NVIDIA Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include "nvc0.h"
+
+struct nouveau_oclass *
+nvea_fb_oclass = &(struct nouveau_fb_impl) {
+	.base.handle = NV_SUBDEV(FB, 0xea),
+	.base.ofuncs = &(struct nouveau_ofuncs) {
+		.ctor = nvc0_fb_ctor,
+		.dtor = nvc0_fb_dtor,
+		.init = nvc0_fb_init,
+		.fini = _nouveau_fb_fini,
+	},
+	.memtype = nvc0_fb_memtype_valid,
+	.ram = &nvea_ram_oclass,
+}.base;
diff --git a/drivers/gpu/drm/nouveau/core/subdev/fb/priv.h b/drivers/gpu/drm/nouveau/core/subdev/fb/priv.h
index edaf95d..0b95a25 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/fb/priv.h
+++ b/drivers/gpu/drm/nouveau/core/subdev/fb/priv.h
@@ -32,6 +32,7 @@ extern struct nouveau_oclass nva3_ram_oclass;
 extern struct nouveau_oclass nvaa_ram_oclass;
 extern struct nouveau_oclass nvc0_ram_oclass;
 extern struct nouveau_oclass nve0_ram_oclass;
+extern struct nouveau_oclass nvea_ram_oclass;
 
 int nouveau_sddr3_calc(struct nouveau_ram *ram);
 int nouveau_gddr5_calc(struct nouveau_ram *ram, bool nuts);
diff --git a/drivers/gpu/drm/nouveau/core/subdev/fb/ramnvea.c b/drivers/gpu/drm/nouveau/core/subdev/fb/ramnvea.c
new file mode 100644
index 0000000..3038e08
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/fb/ramnvea.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2014, NVIDIA Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+/*
+ * TODO replace this CMA-requiring horror with a proper allocator for GPU
+ * objects in main memory. But for the moment it does the job and can reuse some
+ * of the nvc0 functions.
+ */
+
+#include "nvc0.h"
+
+#include <linux/dma-mapping.h>
+
+static int
+nvea_ram_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
+	      struct nouveau_oclass *oclass, void *data, u32 datasize,
+	      struct nouveau_object **pobject)
+{
+	struct nouveau_fb *pfb = nouveau_fb(parent);
+	struct nouveau_ram *ram;
+	void *vram;
+	dma_addr_t dma_handle;
+	int ret;
+
+	ret = nouveau_ram_create(parent, engine, oclass, &ram);
+	*pobject = nv_object(ram);
+	if (ret)
+		return ret;
+
+	ram->type   = NV_MEM_TYPE_STOLEN;
+	/* Use a fixed size of 64MB for now */
+	ram->size = 0x4000000;
+	ram->stolen = (u64)0x00000000;
+	vram = dma_alloc_coherent(nv_device_base(nv_device(parent)), ram->size,
+				  &dma_handle, GFP_KERNEL);
+	if (!vram)
+		return -ENOMEM;
+
+	ret = nouveau_mm_init(&pfb->vram, dma_handle >> 12, ram->size >> 12, 1);
+	if (ret)
+		return ret;
+
+	ram->get = nvc0_ram_get;
+	ram->put = nvc0_ram_put;
+	return 0;
+}
+
+struct nouveau_oclass
+nvea_ram_oclass = {
+	.ofuncs = &(struct nouveau_ofuncs) {
+		.ctor = nvea_ram_ctor,
+		.dtor = _nouveau_ram_dtor,
+		.init = _nouveau_ram_init,
+		.fini = _nouveau_ram_fini,
+	},
+};
-- 
1.8.5.3