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/*
* Copyright 2012 Nouveau Community
*
* 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: Martin Peres
*/
#include <subdev/bios.h>
#include <subdev/bios/dcb.h>
#include <subdev/bios/extdev.h>
static u16
extdev_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt)
{
u8 dcb_ver, dcb_hdr, dcb_cnt, dcb_len;
u16 dcb, extdev = 0;
dcb = dcb_table(bios, &dcb_ver, &dcb_hdr, &dcb_cnt, &dcb_len);
if (!dcb || (dcb_ver != 0x30 && dcb_ver != 0x40))
return 0x0000;
extdev = nvbios_rd16(bios, dcb + 18);
if (!extdev)
return 0x0000;
*ver = nvbios_rd08(bios, extdev + 0);
*hdr = nvbios_rd08(bios, extdev + 1);
*cnt = nvbios_rd08(bios, extdev + 2);
*len = nvbios_rd08(bios, extdev + 3);
return extdev + *hdr;
}
static u16
nvbios_extdev_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
{
u8 hdr, cnt;
u16 extdev = extdev_table(bios, ver, &hdr, len, &cnt);
if (extdev && idx < cnt)
return extdev + idx * *len;
return 0x0000;
}
static void
extdev_parse_entry(struct nvkm_bios *bios, u16 offset,
struct nvbios_extdev_func *entry)
{
entry->type = nvbios_rd08(bios, offset + 0);
entry->addr = nvbios_rd08(bios, offset + 1);
entry->bus = (nvbios_rd08(bios, offset + 2) >> 4) & 1;
}
int
nvbios_extdev_parse(struct nvkm_bios *bios, int idx,
struct nvbios_extdev_func *func)
{
u8 ver, len;
u16 entry;
if (!(entry = nvbios_extdev_entry(bios, idx, &ver, &len)))
return -EINVAL;
extdev_parse_entry(bios, entry, func);
return 0;
}
int
nvbios_extdev_find(struct nvkm_bios *bios, enum nvbios_extdev_type type,
struct nvbios_extdev_func *func)
{
u8 ver, len, i;
u16 entry;
i = 0;
while ((entry = nvbios_extdev_entry(bios, i++, &ver, &len))) {
extdev_parse_entry(bios, entry, func);
if (func->type == type)
return 0;
}
return -EINVAL;
}
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