| /* |
| * 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 "priv.h" |
| |
| #include <subdev/bios.h> |
| #include <subdev/bios/vmap.h> |
| #include <subdev/bios/volt.h> |
| |
| int |
| nvkm_volt_get(struct nvkm_volt *volt) |
| { |
| int ret = volt->func->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; |
| } |
| |
| static int |
| nvkm_volt_set(struct nvkm_volt *volt, u32 uv) |
| { |
| struct nvkm_subdev *subdev = &volt->subdev; |
| int i, ret = -EINVAL; |
| for (i = 0; i < volt->vid_nr; i++) { |
| if (volt->vid[i].uv == uv) { |
| ret = volt->func->vid_set(volt, volt->vid[i].vid); |
| nvkm_debug(subdev, "set %duv: %d\n", uv, ret); |
| break; |
| } |
| } |
| return ret; |
| } |
| |
| 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; |
| } |
| |
| int |
| nvkm_volt_set_id(struct nvkm_volt *volt, u8 id, int condition) |
| { |
| int ret; |
| |
| if (volt->func->set_id) |
| return volt->func->set_id(volt, id, condition); |
| |
| 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; |
| } |
| } |
| |
| static int |
| nvkm_volt_init(struct nvkm_subdev *subdev) |
| { |
| struct nvkm_volt *volt = nvkm_volt(subdev); |
| int ret = nvkm_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; |
| } |
| |
| static void * |
| nvkm_volt_dtor(struct nvkm_subdev *subdev) |
| { |
| return nvkm_volt(subdev); |
| } |
| |
| static const struct nvkm_subdev_func |
| nvkm_volt = { |
| .dtor = nvkm_volt_dtor, |
| .init = nvkm_volt_init, |
| }; |
| |
| void |
| nvkm_volt_ctor(const struct nvkm_volt_func *func, struct nvkm_device *device, |
| int index, struct nvkm_volt *volt) |
| { |
| struct nvkm_bios *bios = device->bios; |
| int i; |
| |
| nvkm_subdev_ctor(&nvkm_volt, device, index, 0, &volt->subdev); |
| volt->func = func; |
| |
| /* 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); |
| } |
| } |
| } |
| |
| int |
| nvkm_volt_new_(const struct nvkm_volt_func *func, struct nvkm_device *device, |
| int index, struct nvkm_volt **pvolt) |
| { |
| if (!(*pvolt = kzalloc(sizeof(**pvolt), GFP_KERNEL))) |
| return -ENOMEM; |
| nvkm_volt_ctor(func, device, index, *pvolt); |
| return 0; |
| } |