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