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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
*/
#include <subdev/volt.h>
#include <subdev/bios.h>
#include <subdev/bios/vmap.h>
#include <subdev/bios/volt.h>
static int
nvkm_volt_get(struct nvkm_volt *volt)
{
if (volt->vid_get) {
int ret = volt->vid_get(volt), i;
if (ret >= 0) {
for (i = 0; i < volt->vid_nr; i++) {
if (volt->vid[i].vid == ret)
return volt->vid[i].uv;
}
ret = -EINVAL;
}
return ret;
}
return -ENODEV;
}
static int
nvkm_volt_set(struct nvkm_volt *volt, u32 uv)
{
struct nvkm_subdev *subdev = &volt->subdev;
if (volt->vid_set) {
int i, ret = -EINVAL;
for (i = 0; i < volt->vid_nr; i++) {
if (volt->vid[i].uv == uv) {
ret = volt->vid_set(volt, volt->vid[i].vid);
nvkm_debug(subdev, "set %duv: %d\n", uv, ret);
break;
}
}
return ret;
}
return -ENODEV;
}
static int
nvkm_volt_map(struct nvkm_volt *volt, u8 id)
{
struct nvkm_bios *bios = volt->subdev.device->bios;
struct nvbios_vmap_entry info;
u8 ver, len;
u16 vmap;
vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info);
if (vmap) {
if (info.link != 0xff) {
int ret = nvkm_volt_map(volt, info.link);
if (ret < 0)
return ret;
info.min += ret;
}
return info.min;
}
return id ? id * 10000 : -ENODEV;
}
static int
nvkm_volt_set_id(struct nvkm_volt *volt, u8 id, int condition)
{
int ret = nvkm_volt_map(volt, id);
if (ret >= 0) {
int prev = nvkm_volt_get(volt);
if (!condition || prev < 0 ||
(condition < 0 && ret < prev) ||
(condition > 0 && ret > prev)) {
ret = nvkm_volt_set(volt, ret);
} else {
ret = 0;
}
}
return ret;
}
static void
nvkm_volt_parse_bios(struct nvkm_bios *bios, struct nvkm_volt *volt)
{
struct nvbios_volt_entry ivid;
struct nvbios_volt info;
u8 ver, hdr, cnt, len;
u16 data;
int i;
data = nvbios_volt_parse(bios, &ver, &hdr, &cnt, &len, &info);
if (data && info.vidmask && info.base && info.step) {
for (i = 0; i < info.vidmask + 1; i++) {
if (info.base >= info.min &&
info.base <= info.max) {
volt->vid[volt->vid_nr].uv = info.base;
volt->vid[volt->vid_nr].vid = i;
volt->vid_nr++;
}
info.base += info.step;
}
volt->vid_mask = info.vidmask;
} else if (data && info.vidmask) {
for (i = 0; i < cnt; i++) {
data = nvbios_volt_entry_parse(bios, i, &ver, &hdr,
&ivid);
if (data) {
volt->vid[volt->vid_nr].uv = ivid.voltage;
volt->vid[volt->vid_nr].vid = ivid.vid;
volt->vid_nr++;
}
}
volt->vid_mask = info.vidmask;
}
}
int
_nvkm_volt_init(struct nvkm_object *object)
{
struct nvkm_volt *volt = (void *)object;
struct nvkm_subdev *subdev = &volt->subdev;
int ret;
ret = nvkm_subdev_init_old(&volt->subdev);
if (ret)
return ret;
ret = volt->get(volt);
if (ret < 0) {
if (ret != -ENODEV)
nvkm_debug(subdev, "current voltage unknown\n");
return 0;
}
nvkm_debug(subdev, "current voltage: %duv\n", ret);
return 0;
}
void
_nvkm_volt_dtor(struct nvkm_object *object)
{
struct nvkm_volt *volt = (void *)object;
nvkm_subdev_destroy(&volt->subdev);
}
int
nvkm_volt_create_(struct nvkm_object *parent, struct nvkm_object *engine,
struct nvkm_oclass *oclass, int length, void **pobject)
{
struct nvkm_device *device = (void *)parent;
struct nvkm_bios *bios = device->bios;
struct nvkm_volt *volt;
int ret, i;
ret = nvkm_subdev_create_(parent, engine, oclass, 0, "VOLT",
"voltage", length, pobject);
volt = *pobject;
if (ret)
return ret;
volt->get = nvkm_volt_get;
volt->set = nvkm_volt_set;
volt->set_id = nvkm_volt_set_id;
/* Assuming the non-bios device should build the voltage table later */
if (bios)
nvkm_volt_parse_bios(bios, volt);
if (volt->vid_nr) {
for (i = 0; i < volt->vid_nr; i++) {
nvkm_debug(&volt->subdev, "VID %02x: %duv\n",
volt->vid[i].vid, volt->vid[i].uv);
}
/*XXX: this is an assumption.. there probably exists boards
* out there with i2c-connected voltage controllers too..
*/
ret = nvkm_voltgpio_init(volt);
if (ret == 0) {
volt->vid_get = nvkm_voltgpio_get;
volt->vid_set = nvkm_voltgpio_set;
}
}
return ret;
}
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