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kernel add
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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>
* Roy Spliet <rspliet@eclipso.eu>
*/
#include "priv.h"
struct ramxlat {
int id;
u8 enc;
};
static inline int
ramxlat(const struct ramxlat *xlat, int id)
{
while (xlat->id >= 0) {
if (xlat->id == id)
return xlat->enc;
xlat++;
}
return -EINVAL;
}
static const struct ramxlat
ramddr3_cl[] = {
{ 5, 2 }, { 6, 4 }, { 7, 6 }, { 8, 8 }, { 9, 10 }, { 10, 12 },
{ 11, 14 },
/* the below are mentioned in some, but not all, ddr3 docs */
{ 12, 1 }, { 13, 3 }, { 14, 5 },
{ -1 }
};
static const struct ramxlat
ramddr3_wr[] = {
{ 5, 1 }, { 6, 2 }, { 7, 3 }, { 8, 4 }, { 10, 5 }, { 12, 6 },
/* the below are mentioned in some, but not all, ddr3 docs */
{ 14, 7 }, { 15, 7 }, { 16, 0 },
{ -1 }
};
static const struct ramxlat
ramddr3_cwl[] = {
{ 5, 0 }, { 6, 1 }, { 7, 2 }, { 8, 3 },
/* the below are mentioned in some, but not all, ddr3 docs */
{ 9, 4 }, { 10, 5 },
{ -1 }
};
int
nvkm_sddr3_calc(struct nvkm_ram *ram)
{
int CWL, CL, WR, DLL = 0, ODT = 0;
DLL = !ram->next->bios.ramcfg_DLLoff;
switch (ram->next->bios.timing_ver) {
case 0x10:
if (ram->next->bios.timing_hdr < 0x17) {
/* XXX: NV50: Get CWL from the timing register */
return -ENOSYS;
}
CWL = ram->next->bios.timing_10_CWL;
CL = ram->next->bios.timing_10_CL;
WR = ram->next->bios.timing_10_WR;
ODT = ram->next->bios.timing_10_ODT;
break;
case 0x20:
CWL = (ram->next->bios.timing[1] & 0x00000f80) >> 7;
CL = (ram->next->bios.timing[1] & 0x0000001f) >> 0;
WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
/* XXX: Get these values from the VBIOS instead */
ODT = (ram->mr[1] & 0x004) >> 2 |
(ram->mr[1] & 0x040) >> 5 |
(ram->mr[1] & 0x200) >> 7;
break;
default:
return -ENOSYS;
}
CWL = ramxlat(ramddr3_cwl, CWL);
CL = ramxlat(ramddr3_cl, CL);
WR = ramxlat(ramddr3_wr, WR);
if (CL < 0 || CWL < 0 || WR < 0)
return -EINVAL;
ram->mr[0] &= ~0xf74;
ram->mr[0] |= (WR & 0x07) << 9;
ram->mr[0] |= (CL & 0x0e) << 3;
ram->mr[0] |= (CL & 0x01) << 2;
ram->mr[1] &= ~0x245;
ram->mr[1] |= (ODT & 0x1) << 2;
ram->mr[1] |= (ODT & 0x2) << 5;
ram->mr[1] |= (ODT & 0x4) << 7;
ram->mr[1] |= !DLL;
ram->mr[2] &= ~0x038;
ram->mr[2] |= (CWL & 0x07) << 3;
return 0;
}
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