diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c new file mode 100644 index 000000000000..39f15803f2d4 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c @@ -0,0 +1,204 @@ +/* + * 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) +{ + 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); + nv_debug(volt, "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 = nvkm_bios(volt); + 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; + int ret; + + ret = nvkm_subdev_init(&volt->base); + if (ret) + return ret; + + ret = volt->get(volt); + if (ret < 0) { + if (ret != -ENODEV) + nv_debug(volt, "current voltage unknown\n"); + return 0; + } + + nv_info(volt, "GPU voltage: %duv\n", ret); + return 0; +} + +void +_nvkm_volt_dtor(struct nvkm_object *object) +{ + struct nvkm_volt *volt = (void *)object; + nvkm_subdev_destroy(&volt->base); +} + +int +nvkm_volt_create_(struct nvkm_object *parent, struct nvkm_object *engine, + struct nvkm_oclass *oclass, int length, void **pobject) +{ + struct nvkm_bios *bios = nvkm_bios(parent); + 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++) { + nv_debug(volt, "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; +} |