drm/nouveau/fb/sddr2: Generate MR values

V2: Always disable DLL reset

Signed-off-by: Roy Spliet <rspliet@eclipso.eu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
index 37ab09b..f0647f6 100644 (file)
--- a/drivers/gpu/drm/nouveau/Makefile
+++ b/drivers/gpu/drm/nouveau/Makefile
@@ -125,6 +125,7 @@ nouveau-y += core/subdev/fb/ramnvc0.o
 nouveau-y += core/subdev/fb/ramnve0.o
 nouveau-y += core/subdev/fb/ramgk20a.o
 nouveau-y += core/subdev/fb/ramgm107.o
+nouveau-y += core/subdev/fb/sddr2.o
 nouveau-y += core/subdev/fb/sddr3.o
 nouveau-y += core/subdev/fb/gddr5.o
 nouveau-y += core/subdev/fuse/base.o

diff --git a/drivers/gpu/drm/nouveau/core/subdev/fb/priv.h b/drivers/gpu/drm/nouveau/core/subdev/fb/priv.h
index 82273f8..60322e9 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/subdev/fb/priv.h
+++ b/drivers/gpu/drm/nouveau/core/subdev/fb/priv.h
@@ -35,6 +35,7 @@ extern struct nouveau_oclass nve0_ram_oclass;
 extern struct nouveau_oclass gk20a_ram_oclass;
 extern struct nouveau_oclass gm107_ram_oclass;
 
+int nouveau_sddr2_calc(struct nouveau_ram *ram);
 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/sddr2.c b/drivers/gpu/drm/nouveau/core/subdev/fb/sddr2.c
new file mode 100644 (file)
index 0000000..b5b0432
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/fb/sddr2.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2014 Roy Spliet
+ *
+ * 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: Roy Spliet <rspliet@eclipso.eu>
+ *          Ben Skeggs
+ */
+
+#include <subdev/bios.h>
+#include "priv.h"
+
+struct ramxlat {
+       int id;
+       u8 enc;
+};
+
+static inline int
+ramxlat(const struct ramxlat *xlat, int id)
+{
+       while (xlat->id >= 0) {
+               if (xlat->id == id)
+                       return xlat->enc;
+               xlat++;
+       }
+       return -EINVAL;
+}
+
+static const struct ramxlat
+ramddr2_cl[] = {
+       { 2, 2 }, { 3, 3 }, { 4, 4 }, { 5, 5 }, { 6, 6 },
+       /* The following are available in some, but not all DDR2 docs */
+       { 7, 7 },
+       { -1 }
+};
+
+static const struct ramxlat
+ramddr2_wr[] = {
+       { 2, 1 }, { 3, 2 }, { 4, 3 }, { 5, 4 }, { 6, 5 },
+       /* The following are available in some, but not all DDR2 docs */
+       { 7, 6 },
+       { -1 }
+};
+
+int
+nouveau_sddr2_calc(struct nouveau_ram *ram)
+{
+       struct nouveau_bios *bios = nouveau_bios(ram);
+       int CL, WR, DLL = 0, ODT = 0;
+
+       switch (!!ram->timing.data * ram->timing.version) {
+       case 0x10:
+               CL  =   nv_ro08(bios, ram->timing.data + 0x02);
+               WR  =   nv_ro08(bios, ram->timing.data + 0x00);
+               DLL = !(nv_ro08(bios, ram->ramcfg.data + 0x02) & 0x40);
+               ODT =   nv_ro08(bios, ram->timing.data + 0x0e) & 0x03;
+               break;
+       case 0x20:
+               CL  =  nv_ro08(bios, ram->timing.data + 0x04) & 0x1f;
+               WR  =  nv_ro08(bios, ram->timing.data + 0x0a) & 0x7f;
+               break;
+       default:
+               return -ENOSYS;
+       }
+
+       CL  = ramxlat(ramddr2_cl, CL);
+       WR  = ramxlat(ramddr2_wr, WR);
+       if (CL < 0 || WR < 0)
+               return -EINVAL;
+
+       ram->mr[0] &= ~0xf70;
+       ram->mr[0] |= (WR & 0x07) << 9;
+       ram->mr[0] |= (CL & 0x07) << 4;
+
+       ram->mr[1] &= ~0x045;
+       ram->mr[1] |= (ODT & 0x1) << 2;
+       ram->mr[1] |= (ODT & 0x2) << 5;
+       ram->mr[1] |= !DLL;
+       return 0;
+}