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/*
* Copyright 2013 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 <bskeggs@redhat.com>
*/
#include <subdev/bios.h>
#include <subdev/bios/bit.h>
#include <subdev/bios/ramcfg.h>
#include <subdev/bios/M0203.h>
static u8
nvbios_ramcfg_strap(struct nvkm_subdev *subdev)
{
return (nvkm_rd32(subdev->device, 0x101000) & 0x0000003c) >> 2;
}
u8
nvbios_ramcfg_count(struct nvkm_bios *bios)
{
struct bit_entry bit_M;
if (!bit_entry(bios, 'M', &bit_M)) {
if (bit_M.version == 1 && bit_M.length >= 5)
return nvbios_rd08(bios, bit_M.offset + 2);
if (bit_M.version == 2 && bit_M.length >= 3)
return nvbios_rd08(bios, bit_M.offset + 0);
}
return 0x00;
}
u8
nvbios_ramcfg_index(struct nvkm_subdev *subdev)
{
struct nvkm_bios *bios = subdev->device->bios;
u8 strap = nvbios_ramcfg_strap(subdev);
u32 xlat = 0x00000000;
struct bit_entry bit_M;
struct nvbios_M0203E M0203E;
u8 ver, hdr;
if (!bit_entry(bios, 'M', &bit_M)) {
if (bit_M.version == 1 && bit_M.length >= 5)
xlat = nvbios_rd16(bios, bit_M.offset + 3);
if (bit_M.version == 2 && bit_M.length >= 3) {
/*XXX: is M ever shorter than this?
* if not - what is xlat used for now?
* also - sigh..
*/
if (bit_M.length >= 7 &&
nvbios_M0203Em(bios, strap, &ver, &hdr, &M0203E))
return M0203E.group;
xlat = nvbios_rd16(bios, bit_M.offset + 1);
}
}
if (xlat)
strap = nvbios_rd08(bios, xlat + strap);
return strap;
}
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