diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c | 164 |
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; +} |