1 files changed, 94 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/sddr2.c b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/sddr2.c
new file mode 100644
index 000000000000..252575f3aa29
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/sddr2.c
@@ -0,0 +1,94 @@
+/*
+ * 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 "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)
+{
+        int CL, WR, DLL = 0, ODT = 0;
+
+        switch (ram->next->bios.timing_ver) {
+        case 0x10:
+                CL  = ram->next->bios.timing_10_CL;
+                WR  = ram->next->bios.timing_10_WR;
+                DLL = !ram->next->bios.ramcfg_10_DLLoff;
+                ODT = ram->next->bios.timing_10_ODT & 3;
+                break;
+        case 0x20:
+                CL  = (ram->next->bios.timing[1] & 0x0000001f);
+                WR  = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
+                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;
+}