111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
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/*
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* Copyright 2012 Nouveau Community
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Martin Peres
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*/
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#include <subdev/bios.h>
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#include <subdev/bios/dcb.h>
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#include <subdev/bios/extdev.h>
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static u16
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extdev_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt)
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{
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u8 dcb_ver, dcb_hdr, dcb_cnt, dcb_len;
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u16 dcb, extdev = 0;
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dcb = dcb_table(bios, &dcb_ver, &dcb_hdr, &dcb_cnt, &dcb_len);
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if (!dcb || (dcb_ver != 0x30 && dcb_ver != 0x40 && dcb_ver != 0x41))
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return 0x0000;
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extdev = nvbios_rd16(bios, dcb + 18);
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if (!extdev)
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return 0x0000;
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*ver = nvbios_rd08(bios, extdev + 0);
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*hdr = nvbios_rd08(bios, extdev + 1);
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*cnt = nvbios_rd08(bios, extdev + 2);
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*len = nvbios_rd08(bios, extdev + 3);
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return extdev + *hdr;
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}
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bool
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nvbios_extdev_skip_probe(struct nvkm_bios *bios)
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{
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u8 ver, hdr, len, cnt;
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u16 data = extdev_table(bios, &ver, &hdr, &len, &cnt);
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if (data && ver == 0x40 && hdr >= 5) {
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u8 flags = nvbios_rd08(bios, data - hdr + 4);
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if (flags & 1)
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return true;
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}
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return false;
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}
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static u16
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nvbios_extdev_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
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{
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u8 hdr, cnt;
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u16 extdev = extdev_table(bios, ver, &hdr, len, &cnt);
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if (extdev && idx < cnt)
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return extdev + idx * *len;
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return 0x0000;
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}
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static void
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extdev_parse_entry(struct nvkm_bios *bios, u16 offset,
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struct nvbios_extdev_func *entry)
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{
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entry->type = nvbios_rd08(bios, offset + 0);
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entry->addr = nvbios_rd08(bios, offset + 1);
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entry->bus = (nvbios_rd08(bios, offset + 2) >> 4) & 1;
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}
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int
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nvbios_extdev_parse(struct nvkm_bios *bios, int idx,
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struct nvbios_extdev_func *func)
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{
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u8 ver, len;
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u16 entry;
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if (!(entry = nvbios_extdev_entry(bios, idx, &ver, &len)))
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return -EINVAL;
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extdev_parse_entry(bios, entry, func);
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return 0;
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}
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int
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nvbios_extdev_find(struct nvkm_bios *bios, enum nvbios_extdev_type type,
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struct nvbios_extdev_func *func)
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{
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u8 ver, len, i;
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u16 entry;
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i = 0;
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while ((entry = nvbios_extdev_entry(bios, i++, &ver, &len))) {
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extdev_parse_entry(bios, entry, func);
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if (func->type == type)
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return 0;
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}
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return -EINVAL;
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}
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