diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/core/subdev/bios/dcb.c')
-rw-r--r-- | drivers/gpu/drm/nouveau/core/subdev/bios/dcb.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/dcb.c b/drivers/gpu/drm/nouveau/core/subdev/bios/dcb.c new file mode 100644 index 0000000..9ed6e72 --- /dev/null +++ b/drivers/gpu/drm/nouveau/core/subdev/bios/dcb.c @@ -0,0 +1,135 @@ +/* + * 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 "core/device.h" + +#include "subdev/bios.h" +#include "subdev/bios/dcb.h" + +u16 +dcb_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len) +{ + struct nouveau_device *device = nv_device(bios); + u16 dcb = 0x0000; + + if (device->card_type > NV_04) + dcb = nv_ro16(bios, 0x36); + if (!dcb) { + nv_warn(bios, "DCB table not found\n"); + return dcb; + } + + *ver = nv_ro08(bios, dcb); + + if (*ver >= 0x41) { + nv_warn(bios, "DCB *ver 0x%02x unknown\n", *ver); + return 0x0000; + } else + if (*ver >= 0x30) { + if (nv_ro32(bios, dcb + 6) == 0x4edcbdcb) { + *hdr = nv_ro08(bios, dcb + 1); + *cnt = nv_ro08(bios, dcb + 2); + *len = nv_ro08(bios, dcb + 3); + return dcb; + } + } else + if (*ver >= 0x20) { + if (nv_ro32(bios, dcb + 4) == 0x4edcbdcb) { + u16 i2c = nv_ro16(bios, dcb + 2); + *hdr = 8; + *cnt = (i2c - dcb) / 8; + *len = 8; + return dcb; + } + } else + if (*ver >= 0x15) { + if (!nv_strncmp(bios, dcb - 7, 7, "DEV_REC")) { + u16 i2c = nv_ro16(bios, dcb + 2); + *hdr = 4; + *cnt = (i2c - dcb) / 10; + *len = 10; + return dcb; + } + } else { + /* + * v1.4 (some NV15/16, NV11+) seems the same as v1.5, but + * always has the same single (crt) entry, even when tv-out + * present, so the conclusion is this version cannot really + * be used. + * + * v1.2 tables (some NV6/10, and NV15+) normally have the + * same 5 entries, which are not specific to the card and so + * no use. + * + * v1.2 does have an I2C table that read_dcb_i2c_table can + * handle, but cards exist (nv11 in #14821) with a bad i2c + * table pointer, so use the indices parsed in + * parse_bmp_structure. + * + * v1.1 (NV5+, maybe some NV4) is entirely unhelpful + */ + nv_warn(bios, "DCB contains no useful data\n"); + return 0x0000; + } + + nv_warn(bios, "DCB header validation failed\n"); + return 0x0000; +} + +u16 +dcb_outp(struct nouveau_bios *bios, u8 idx, u8 *ver, u8 *len) +{ + u8 hdr, cnt; + u16 dcb = dcb_table(bios, ver, &hdr, &cnt, len); + if (dcb && idx < cnt) + return dcb + hdr + (idx * *len); + return 0x0000; +} + +int +dcb_outp_foreach(struct nouveau_bios *bios, void *data, + int (*exec)(struct nouveau_bios *, void *, int, u16)) +{ + int ret, idx = -1; + u8 ver, len; + u16 outp; + + while ((outp = dcb_outp(bios, ++idx, &ver, &len))) { + if (nv_ro32(bios, outp) == 0x00000000) + break; /* seen on an NV11 with DCB v1.5 */ + if (nv_ro32(bios, outp) == 0xffffffff) + break; /* seen on an NV17 with DCB v2.0 */ + + if (nv_ro08(bios, outp) == DCB_OUTPUT_UNUSED) + continue; + if (nv_ro08(bios, outp) == DCB_OUTPUT_EOL) + break; + + ret = exec(bios, data, idx, outp); + if (ret) + return ret; + } + + return 0; +} |