drm/nouveau/bios: implement BIT 'U' table (and subtable) parsing in core

This will, in the near future, replace what's currently in the DRM
nouveau_bios.c code.

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

3 files changed, 227 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
index 4219dc5e2f17..2ca1d39d5027 100644
--- a/drivers/gpu/drm/nouveau/Makefile
+++ b/drivers/gpu/drm/nouveau/Makefile
@@ -29,6 +29,7 @@ nouveau-y += core/subdev/bios/base.o
 nouveau-y += core/subdev/bios/bit.o
 nouveau-y += core/subdev/bios/conn.o
 nouveau-y += core/subdev/bios/dcb.o
+nouveau-y += core/subdev/bios/disp.o
 nouveau-y += core/subdev/bios/dp.o
 nouveau-y += core/subdev/bios/extdev.o
 nouveau-y += core/subdev/bios/gpio.o
diff --git a/drivers/gpu/drm/nouveau/core/include/subdev/bios/disp.h b/drivers/gpu/drm/nouveau/core/include/subdev/bios/disp.h
new file mode 100644
index 000000000000..c35937e2f6a4
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/include/subdev/bios/disp.h
@@ -0,0 +1,48 @@
+#ifndef __NVBIOS_DISP_H__
+#define __NVBIOS_DISP_H__
+
+u16 nvbios_disp_table(struct nouveau_bios *,
+                      u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *sub);
+
+struct nvbios_disp {
+        u16 data;
+};
+
+u16 nvbios_disp_entry(struct nouveau_bios *, u8 idx,
+                      u8 *ver, u8 *hdr__, u8 *sub);
+u16 nvbios_disp_parse(struct nouveau_bios *, u8 idx,
+                      u8 *ver, u8 *hdr__, u8 *sub,
+                      struct nvbios_disp *);
+
+struct nvbios_outp {
+        u16 type;
+        u16 mask;
+        u16 script[3];
+};
+
+u16 nvbios_outp_entry(struct nouveau_bios *, u8 idx,
+                      u8 *ver, u8 *hdr, u8 *cnt, u8 *len);
+u16 nvbios_outp_parse(struct nouveau_bios *, u8 idx,
+                      u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+                      struct nvbios_outp *);
+u16 nvbios_outp_match(struct nouveau_bios *, u16 type, u16 mask,
+                      u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+                      struct nvbios_outp *);
+
+
+struct nvbios_ocfg {
+        u16 match;
+        u16 clkcmp[2];
+};
+
+u16 nvbios_ocfg_entry(struct nouveau_bios *, u16 outp, u8 idx,
+                      u8 *ver, u8 *hdr, u8 *cnt, u8 *len);
+u16 nvbios_ocfg_parse(struct nouveau_bios *, u16 outp, u8 idx,
+                      u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+                      struct nvbios_ocfg *);
+u16 nvbios_ocfg_match(struct nouveau_bios *, u16 outp, u16 type,
+                      u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+                      struct nvbios_ocfg *);
+u16 nvbios_oclk_match(struct nouveau_bios *, u16 cmp, u32 khz);
+
+#endif
diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/disp.c b/drivers/gpu/drm/nouveau/core/subdev/bios/disp.c
new file mode 100644
index 000000000000..7f16e52d9bea
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/bios/disp.c
@@ -0,0 +1,178 @@
+/*
+ * Copyright 2012 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
+ */
+
+#include <subdev/bios.h>
+#include <subdev/bios/bit.h>
+#include <subdev/bios/disp.h>
+
+u16
+nvbios_disp_table(struct nouveau_bios *bios,
+                  u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *sub)
+{
+        struct bit_entry U;
+
+        if (!bit_entry(bios, 'U', &U)) {
+                if (U.version == 1) {
+                        u16 data = nv_ro16(bios, U.offset);
+                        if (data) {
+                                *ver = nv_ro08(bios, data + 0x00);
+                                switch (*ver) {
+                                case 0x20:
+                                case 0x21:
+                                        *hdr = nv_ro08(bios, data + 0x01);
+                                        *len = nv_ro08(bios, data + 0x02);
+                                        *cnt = nv_ro08(bios, data + 0x03);
+                                        *sub = nv_ro08(bios, data + 0x04);
+                                        return data;
+                                default:
+                                        break;
+                                }
+                        }
+                }
+        }
+
+        return 0x0000;
+}
+
+u16
+nvbios_disp_entry(struct nouveau_bios *bios, u8 idx,
+                  u8 *ver, u8 *len, u8 *sub)
+{
+        u8  hdr, cnt;
+        u16 data = nvbios_disp_table(bios, ver, &hdr, &cnt, len, sub);
+        if (data && idx < cnt)
+                return data + hdr + (idx * *len);
+        *ver = 0x00;
+        return 0x0000;
+}
+
+u16
+nvbios_disp_parse(struct nouveau_bios *bios, u8 idx,
+                  u8 *ver, u8 *len, u8 *sub,
+                  struct nvbios_disp *info)
+{
+        u16 data = nvbios_disp_entry(bios, idx, ver, len, sub);
+        if (data && *len >= 2) {
+                info->data = nv_ro16(bios, data + 0);
+                return data;
+        }
+        return 0x0000;
+}
+
+u16
+nvbios_outp_entry(struct nouveau_bios *bios, u8 idx,
+                  u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
+{
+        struct nvbios_disp info;
+        u16 data = nvbios_disp_parse(bios, idx, ver, len, hdr, &info);
+        if (data) {
+                *cnt = nv_ro08(bios, info.data + 0x05);
+                *len = 0x06;
+                data = info.data;
+        }
+        return data;
+}
+
+u16
+nvbios_outp_parse(struct nouveau_bios *bios, u8 idx,
+                  u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+                  struct nvbios_outp *info)
+{
+        u16 data = nvbios_outp_entry(bios, idx, ver, hdr, cnt, len);
+        if (data && *hdr >= 0x0a) {
+                info->type      = nv_ro16(bios, data + 0x00);
+                info->mask      = nv_ro32(bios, data + 0x02);
+                if (*ver <= 0x20) /* match any link */
+                        info->mask |= 0x00c0;
+                info->script[0] = nv_ro16(bios, data + 0x06);
+                info->script[1] = nv_ro16(bios, data + 0x08);
+                info->script[2] = 0x0000;
+                if (*hdr >= 0x0c)
+                        info->script[2] = nv_ro16(bios, data + 0x0a);
+                return data;
+        }
+        return 0x0000;
+}
+
+u16
+nvbios_outp_match(struct nouveau_bios *bios, u16 type, u16 mask,
+                  u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+                  struct nvbios_outp *info)
+{
+        u16 data, idx = 0;
+        while ((data = nvbios_outp_parse(bios, idx++, ver, hdr, cnt, len, info)) || *ver) {
+                if (data && info->type == type) {
+                        if ((info->mask & mask) == mask)
+                                break;
+                }
+        }
+        return data;
+}
+
+u16
+nvbios_ocfg_entry(struct nouveau_bios *bios, u16 outp, u8 idx,
+                  u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
+{
+        if (idx < *cnt)
+                return outp + *hdr + (idx * *len);
+        return 0x0000;
+}
+
+u16
+nvbios_ocfg_parse(struct nouveau_bios *bios, u16 outp, u8 idx,
+                  u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+                  struct nvbios_ocfg *info)
+{
+        u16 data = nvbios_ocfg_entry(bios, outp, idx, ver, hdr, cnt, len);
+        if (data) {
+                info->match     = nv_ro16(bios, data + 0x00);
+                info->clkcmp[0] = nv_ro16(bios, data + 0x02);
+                info->clkcmp[1] = nv_ro16(bios, data + 0x04);
+        }
+        return data;
+}
+
+u16
+nvbios_ocfg_match(struct nouveau_bios *bios, u16 outp, u16 type,
+                  u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+                  struct nvbios_ocfg *info)
+{
+        u16 data, idx = 0;
+        while ((data = nvbios_ocfg_parse(bios, outp, idx++, ver, hdr, cnt, len, info))) {
+                if (info->match == type)
+                        break;
+        }
+        return data;
+}
+
+u16
+nvbios_oclk_match(struct nouveau_bios *bios, u16 cmp, u32 khz)
+{
+        while (cmp) {
+                if (khz / 10 >= nv_ro16(bios, cmp + 0x00))
+                        return  nv_ro16(bios, cmp + 0x02);
+                cmp += 0x04;
+        }
+        return 0x0000;
+}