165 lines
4.7 KiB
C
165 lines
4.7 KiB
C
/*
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* Copyright 2012 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
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*/
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#include <subdev/bios.h>
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#include <subdev/bios/dcb.h>
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#include <subdev/bios/i2c.h>
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u16
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dcb_i2c_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
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{
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u16 i2c = 0x0000;
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u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
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if (dcb) {
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if (*ver >= 0x15)
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i2c = nvbios_rd16(bios, dcb + 2);
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if (*ver >= 0x30)
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i2c = nvbios_rd16(bios, dcb + 4);
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}
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if (i2c && *ver >= 0x42) {
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nvkm_warn(&bios->subdev, "ccb %02x not supported\n", *ver);
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return 0x0000;
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}
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if (i2c && *ver >= 0x30) {
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*ver = nvbios_rd08(bios, i2c + 0);
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*hdr = nvbios_rd08(bios, i2c + 1);
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*cnt = nvbios_rd08(bios, i2c + 2);
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*len = nvbios_rd08(bios, i2c + 3);
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} else {
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*ver = *ver; /* use DCB version */
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*hdr = 0;
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*cnt = 16;
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*len = 4;
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}
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return i2c;
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}
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u16
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dcb_i2c_entry(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len)
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{
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u8 hdr, cnt;
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u16 i2c = dcb_i2c_table(bios, ver, &hdr, &cnt, len);
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if (i2c && idx < cnt)
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return i2c + hdr + (idx * *len);
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return 0x0000;
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}
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int
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dcb_i2c_parse(struct nvkm_bios *bios, u8 idx, struct dcb_i2c_entry *info)
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{
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struct nvkm_subdev *subdev = &bios->subdev;
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u8 ver, len;
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u16 ent = dcb_i2c_entry(bios, idx, &ver, &len);
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if (ent) {
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if (ver >= 0x41) {
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u32 ent_value = nvbios_rd32(bios, ent);
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u8 i2c_port = (ent_value >> 0) & 0x1f;
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u8 dpaux_port = (ent_value >> 5) & 0x1f;
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/* value 0x1f means unused according to DCB 4.x spec */
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if (i2c_port == 0x1f && dpaux_port == 0x1f)
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info->type = DCB_I2C_UNUSED;
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else
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info->type = DCB_I2C_PMGR;
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} else
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if (ver >= 0x30) {
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info->type = nvbios_rd08(bios, ent + 0x03);
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} else {
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info->type = nvbios_rd08(bios, ent + 0x03) & 0x07;
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if (info->type == 0x07)
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info->type = DCB_I2C_UNUSED;
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}
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info->drive = DCB_I2C_UNUSED;
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info->sense = DCB_I2C_UNUSED;
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info->share = DCB_I2C_UNUSED;
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info->auxch = DCB_I2C_UNUSED;
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switch (info->type) {
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case DCB_I2C_NV04_BIT:
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info->drive = nvbios_rd08(bios, ent + 0);
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info->sense = nvbios_rd08(bios, ent + 1);
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return 0;
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case DCB_I2C_NV4E_BIT:
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info->drive = nvbios_rd08(bios, ent + 1);
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return 0;
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case DCB_I2C_NVIO_BIT:
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info->drive = nvbios_rd08(bios, ent + 0) & 0x0f;
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if (nvbios_rd08(bios, ent + 1) & 0x01)
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info->share = nvbios_rd08(bios, ent + 1) >> 1;
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return 0;
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case DCB_I2C_NVIO_AUX:
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info->auxch = nvbios_rd08(bios, ent + 0) & 0x0f;
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if (nvbios_rd08(bios, ent + 1) & 0x01)
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info->share = info->auxch;
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return 0;
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case DCB_I2C_PMGR:
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info->drive = (nvbios_rd16(bios, ent + 0) & 0x01f) >> 0;
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if (info->drive == 0x1f)
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info->drive = DCB_I2C_UNUSED;
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info->auxch = (nvbios_rd16(bios, ent + 0) & 0x3e0) >> 5;
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if (info->auxch == 0x1f)
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info->auxch = DCB_I2C_UNUSED;
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info->share = info->auxch;
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return 0;
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case DCB_I2C_UNUSED:
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return 0;
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default:
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nvkm_warn(subdev, "unknown i2c type %d\n", info->type);
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info->type = DCB_I2C_UNUSED;
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return 0;
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}
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}
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if (bios->bmp_offset && idx < 2) {
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/* BMP (from v4.0 has i2c info in the structure, it's in a
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* fixed location on earlier VBIOS
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*/
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if (nvbios_rd08(bios, bios->bmp_offset + 5) < 4)
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ent = 0x0048;
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else
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ent = 0x0036 + bios->bmp_offset;
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if (idx == 0) {
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info->drive = nvbios_rd08(bios, ent + 4);
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if (!info->drive) info->drive = 0x3f;
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info->sense = nvbios_rd08(bios, ent + 5);
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if (!info->sense) info->sense = 0x3e;
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} else
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if (idx == 1) {
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info->drive = nvbios_rd08(bios, ent + 6);
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if (!info->drive) info->drive = 0x37;
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info->sense = nvbios_rd08(bios, ent + 7);
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if (!info->sense) info->sense = 0x36;
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}
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info->type = DCB_I2C_NV04_BIT;
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info->share = DCB_I2C_UNUSED;
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return 0;
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}
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return -ENOENT;
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}
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