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/*
* Copyright 2012 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
*/
#include <subdev/bios.h>
#include <subdev/bios/dcb.h>
#include <subdev/bios/i2c.h>
u16
dcb_i2c_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
{
u16 i2c = 0x0000;
u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
if (dcb) {
if (*ver >= 0x15)
i2c = nv_ro16(bios, dcb + 2);
if (*ver >= 0x30)
i2c = nv_ro16(bios, dcb + 4);
}
if (i2c && *ver >= 0x42) {
nv_warn(bios, "ccb %02x not supported\n", *ver);
return 0x0000;
}
if (i2c && *ver >= 0x30) {
*ver = nv_ro08(bios, i2c + 0);
*hdr = nv_ro08(bios, i2c + 1);
*cnt = nv_ro08(bios, i2c + 2);
*len = nv_ro08(bios, i2c + 3);
} else {
*ver = *ver; /* use DCB version */
*hdr = 0;
*cnt = 16;
*len = 4;
}
return i2c;
}
u16
dcb_i2c_entry(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len)
{
u8 hdr, cnt;
u16 i2c = dcb_i2c_table(bios, ver, &hdr, &cnt, len);
if (i2c && idx < cnt)
return i2c + hdr + (idx * *len);
return 0x0000;
}
int
dcb_i2c_parse(struct nvkm_bios *bios, u8 idx, struct dcb_i2c_entry *info)
{
u8 ver, len;
u16 ent = dcb_i2c_entry(bios, idx, &ver, &len);
if (ent) {
if (ver >= 0x41) {
if (!(nv_ro32(bios, ent) & 0x80000000))
info->type = DCB_I2C_UNUSED;
else
info->type = DCB_I2C_PMGR;
} else
if (ver >= 0x30) {
info->type = nv_ro08(bios, ent + 0x03);
} else {
info->type = nv_ro08(bios, ent + 0x03) & 0x07;
if (info->type == 0x07)
info->type = DCB_I2C_UNUSED;
}
info->drive = DCB_I2C_UNUSED;
info->sense = DCB_I2C_UNUSED;
info->share = DCB_I2C_UNUSED;
info->auxch = DCB_I2C_UNUSED;
switch (info->type) {
case DCB_I2C_NV04_BIT:
info->drive = nv_ro08(bios, ent + 0);
info->sense = nv_ro08(bios, ent + 1);
return 0;
case DCB_I2C_NV4E_BIT:
info->drive = nv_ro08(bios, ent + 1);
return 0;
case DCB_I2C_NVIO_BIT:
info->drive = nv_ro08(bios, ent + 0) & 0x0f;
if (nv_ro08(bios, ent + 1) & 0x01)
info->share = nv_ro08(bios, ent + 1) >> 1;
return 0;
case DCB_I2C_NVIO_AUX:
info->auxch = nv_ro08(bios, ent + 0) & 0x0f;
if (nv_ro08(bios, ent + 1) & 0x01)
info->share = info->auxch;
return 0;
case DCB_I2C_PMGR:
info->drive = (nv_ro16(bios, ent + 0) & 0x01f) >> 0;
if (info->drive == 0x1f)
info->drive = DCB_I2C_UNUSED;
info->auxch = (nv_ro16(bios, ent + 0) & 0x3e0) >> 5;
if (info->auxch == 0x1f)
info->auxch = DCB_I2C_UNUSED;
info->share = info->auxch;
return 0;
case DCB_I2C_UNUSED:
return 0;
default:
nv_warn(bios, "unknown i2c type %d\n", info->type);
info->type = DCB_I2C_UNUSED;
return 0;
}
}
if (bios->bmp_offset && idx < 2) {
/* BMP (from v4.0 has i2c info in the structure, it's in a
* fixed location on earlier VBIOS
*/
if (nv_ro08(bios, bios->bmp_offset + 5) < 4)
ent = 0x0048;
else
ent = 0x0036 + bios->bmp_offset;
if (idx == 0) {
info->drive = nv_ro08(bios, ent + 4);
if (!info->drive) info->drive = 0x3f;
info->sense = nv_ro08(bios, ent + 5);
if (!info->sense) info->sense = 0x3e;
} else
if (idx == 1) {
info->drive = nv_ro08(bios, ent + 6);
if (!info->drive) info->drive = 0x37;
info->sense = nv_ro08(bios, ent + 7);
if (!info->sense) info->sense = 0x36;
}
info->type = DCB_I2C_NV04_BIT;
info->share = DCB_I2C_UNUSED;
return 0;
}
return -ENOENT;
}
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