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path: root/drivers/gpu/drm/nouveau/nvkm/subdev/fb/gddr3.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/fb/gddr3.c')
-rw-r--r--drivers/gpu/drm/nouveau/nvkm/subdev/fb/gddr3.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/gddr3.c b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/gddr3.c
new file mode 100644
index 000000000..1d2d6bae7
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/gddr3.c
@@ -0,0 +1,119 @@
+/*
+ * 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>
+ * Roy Spliet <rspliet@eclipso.eu>
+ */
+#include "ram.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
+ramgddr3_cl_lo[] = {
+ { 5, 5 }, { 7, 7 }, { 8, 0 }, { 9, 1 }, { 10, 2 }, { 11, 3 }, { 12, 8 },
+ /* the below are mentioned in some, but not all, gddr3 docs */
+ { 13, 9 }, { 14, 6 },
+ /* XXX: Per Samsung docs, are these used? They overlap with Qimonda */
+ /* { 4, 4 }, { 5, 5 }, { 6, 6 }, { 12, 8 }, { 13, 9 }, { 14, 10 },
+ * { 15, 11 }, */
+ { -1 }
+};
+
+static const struct ramxlat
+ramgddr3_cl_hi[] = {
+ { 10, 2 }, { 11, 3 }, { 12, 4 }, { 13, 5 }, { 14, 6 }, { 15, 7 },
+ { 16, 0 }, { 17, 1 },
+ { -1 }
+};
+
+static const struct ramxlat
+ramgddr3_wr_lo[] = {
+ { 5, 2 }, { 7, 4 }, { 8, 5 }, { 9, 6 }, { 10, 7 },
+ { 11, 0 }, { 13 , 1 },
+ /* the below are mentioned in some, but not all, gddr3 docs */
+ { 4, 0 }, { 6, 3 }, { 12, 1 },
+ { -1 }
+};
+
+int
+nvkm_gddr3_calc(struct nvkm_ram *ram)
+{
+ int CL, WR, CWL, DLL = 0, ODT = 0, RON, hi;
+
+ switch (ram->next->bios.timing_ver) {
+ case 0x10:
+ CWL = ram->next->bios.timing_10_CWL;
+ CL = ram->next->bios.timing_10_CL;
+ WR = ram->next->bios.timing_10_WR;
+ DLL = !ram->next->bios.ramcfg_DLLoff;
+ ODT = ram->next->bios.timing_10_ODT;
+ RON = ram->next->bios.ramcfg_RON;
+ break;
+ case 0x20:
+ CWL = (ram->next->bios.timing[1] & 0x00000f80) >> 7;
+ CL = (ram->next->bios.timing[1] & 0x0000001f) >> 0;
+ WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
+ /* XXX: Get these values from the VBIOS instead */
+ DLL = !(ram->mr[1] & 0x1);
+ RON = !((ram->mr[1] & 0x300) >> 8);
+ break;
+ default:
+ return -ENOSYS;
+ }
+
+ if (ram->next->bios.timing_ver == 0x20 ||
+ ram->next->bios.ramcfg_timing == 0xff) {
+ ODT = (ram->mr[1] & 0xc) >> 2;
+ }
+
+ hi = ram->mr[2] & 0x1;
+ CL = ramxlat(hi ? ramgddr3_cl_hi : ramgddr3_cl_lo, CL);
+ WR = ramxlat(ramgddr3_wr_lo, WR);
+ if (CL < 0 || CWL < 1 || CWL > 7 || WR < 0)
+ return -EINVAL;
+
+ ram->mr[0] &= ~0xf74;
+ ram->mr[0] |= (CWL & 0x07) << 9;
+ ram->mr[0] |= (CL & 0x07) << 4;
+ ram->mr[0] |= (CL & 0x08) >> 1;
+
+ ram->mr[1] &= ~0x3fc;
+ ram->mr[1] |= (ODT & 0x03) << 2;
+ ram->mr[1] |= (RON & 0x03) << 8;
+ ram->mr[1] |= (WR & 0x03) << 4;
+ ram->mr[1] |= (WR & 0x04) << 5;
+ ram->mr[1] |= !DLL << 6;
+ return 0;
+}