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path: root/drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c')
-rw-r--r--drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c
new file mode 100644
index 000000000..0fc60be32
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c
@@ -0,0 +1,164 @@
+/*
+ * 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/dcb.h>
+#include <subdev/bios/i2c.h>
+
+u16
+dcb_i2c_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
+{
+ u16 i2c = 0x0000;
+ u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
+ if (dcb) {
+ if (*ver >= 0x15)
+ i2c = nvbios_rd16(bios, dcb + 2);
+ if (*ver >= 0x30)
+ i2c = nvbios_rd16(bios, dcb + 4);
+ }
+
+ if (i2c && *ver >= 0x42) {
+ nvkm_warn(&bios->subdev, "ccb %02x not supported\n", *ver);
+ return 0x0000;
+ }
+
+ if (i2c && *ver >= 0x30) {
+ *ver = nvbios_rd08(bios, i2c + 0);
+ *hdr = nvbios_rd08(bios, i2c + 1);
+ *cnt = nvbios_rd08(bios, i2c + 2);
+ *len = nvbios_rd08(bios, i2c + 3);
+ } else {
+ *ver = *ver; /* use DCB version */
+ *hdr = 0;
+ *cnt = 16;
+ *len = 4;
+ }
+
+ return i2c;
+}
+
+u16
+dcb_i2c_entry(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len)
+{
+ u8 hdr, cnt;
+ u16 i2c = dcb_i2c_table(bios, ver, &hdr, &cnt, len);
+ if (i2c && idx < cnt)
+ return i2c + hdr + (idx * *len);
+ return 0x0000;
+}
+
+int
+dcb_i2c_parse(struct nvkm_bios *bios, u8 idx, struct dcb_i2c_entry *info)
+{
+ struct nvkm_subdev *subdev = &bios->subdev;
+ u8 ver, len;
+ u16 ent = dcb_i2c_entry(bios, idx, &ver, &len);
+ if (ent) {
+ if (ver >= 0x41) {
+ u32 ent_value = nvbios_rd32(bios, ent);
+ u8 i2c_port = (ent_value >> 0) & 0x1f;
+ u8 dpaux_port = (ent_value >> 5) & 0x1f;
+ /* value 0x1f means unused according to DCB 4.x spec */
+ if (i2c_port == 0x1f && dpaux_port == 0x1f)
+ info->type = DCB_I2C_UNUSED;
+ else
+ info->type = DCB_I2C_PMGR;
+ } else
+ if (ver >= 0x30) {
+ info->type = nvbios_rd08(bios, ent + 0x03);
+ } else {
+ info->type = nvbios_rd08(bios, ent + 0x03) & 0x07;
+ if (info->type == 0x07)
+ info->type = DCB_I2C_UNUSED;
+ }
+
+ info->drive = DCB_I2C_UNUSED;
+ info->sense = DCB_I2C_UNUSED;
+ info->share = DCB_I2C_UNUSED;
+ info->auxch = DCB_I2C_UNUSED;
+
+ switch (info->type) {
+ case DCB_I2C_NV04_BIT:
+ info->drive = nvbios_rd08(bios, ent + 0);
+ info->sense = nvbios_rd08(bios, ent + 1);
+ return 0;
+ case DCB_I2C_NV4E_BIT:
+ info->drive = nvbios_rd08(bios, ent + 1);
+ return 0;
+ case DCB_I2C_NVIO_BIT:
+ info->drive = nvbios_rd08(bios, ent + 0) & 0x0f;
+ if (nvbios_rd08(bios, ent + 1) & 0x01)
+ info->share = nvbios_rd08(bios, ent + 1) >> 1;
+ return 0;
+ case DCB_I2C_NVIO_AUX:
+ info->auxch = nvbios_rd08(bios, ent + 0) & 0x0f;
+ if (nvbios_rd08(bios, ent + 1) & 0x01)
+ info->share = info->auxch;
+ return 0;
+ case DCB_I2C_PMGR:
+ info->drive = (nvbios_rd16(bios, ent + 0) & 0x01f) >> 0;
+ if (info->drive == 0x1f)
+ info->drive = DCB_I2C_UNUSED;
+ info->auxch = (nvbios_rd16(bios, ent + 0) & 0x3e0) >> 5;
+ if (info->auxch == 0x1f)
+ info->auxch = DCB_I2C_UNUSED;
+ info->share = info->auxch;
+ return 0;
+ case DCB_I2C_UNUSED:
+ return 0;
+ default:
+ nvkm_warn(subdev, "unknown i2c type %d\n", info->type);
+ info->type = DCB_I2C_UNUSED;
+ return 0;
+ }
+ }
+
+ if (bios->bmp_offset && idx < 2) {
+ /* BMP (from v4.0 has i2c info in the structure, it's in a
+ * fixed location on earlier VBIOS
+ */
+ if (nvbios_rd08(bios, bios->bmp_offset + 5) < 4)
+ ent = 0x0048;
+ else
+ ent = 0x0036 + bios->bmp_offset;
+
+ if (idx == 0) {
+ info->drive = nvbios_rd08(bios, ent + 4);
+ if (!info->drive) info->drive = 0x3f;
+ info->sense = nvbios_rd08(bios, ent + 5);
+ if (!info->sense) info->sense = 0x3e;
+ } else
+ if (idx == 1) {
+ info->drive = nvbios_rd08(bios, ent + 6);
+ if (!info->drive) info->drive = 0x37;
+ info->sense = nvbios_rd08(bios, ent + 7);
+ if (!info->sense) info->sense = 0x36;
+ }
+
+ info->type = DCB_I2C_NV04_BIT;
+ info->share = DCB_I2C_UNUSED;
+ return 0;
+ }
+
+ return -ENOENT;
+}