From 39b7e6e547ffca0b42a29df5a213f5bf3a19af0b Mon Sep 17 00:00:00 2001 From: Martin Peres Date: Thu, 18 Feb 2016 14:35:12 +0100 Subject: [PATCH] drm/nouveau/nvbios/iccsense: add parsing of the SENSE table Karol Herbst: v4: don't kmalloc(0) v5: stricter validation Signed-off-by: Karol Herbst Reviewed-by: Martin Peres --- .../include/nvkm/subdev/bios/iccsense.h | 16 +++ .../gpu/drm/nouveau/nvkm/subdev/bios/Kbuild | 1 + .../drm/nouveau/nvkm/subdev/bios/iccsense.c | 100 ++++++++++++++++++ 3 files changed, 117 insertions(+) create mode 100644 drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/iccsense.h create mode 100644 drivers/gpu/drm/nouveau/nvkm/subdev/bios/iccsense.c diff --git a/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/iccsense.h b/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/iccsense.h new file mode 100644 index 000000000000..9cb97477248b --- /dev/null +++ b/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/iccsense.h @@ -0,0 +1,16 @@ +#ifndef __NVBIOS_ICCSENSE_H__ +#define __NVBIOS_ICCSENSE_H__ +struct pwr_rail_t { + u8 mode; + u8 extdev_id; + u8 resistor_mohm; + u8 rail; +}; + +struct nvbios_iccsense { + int nr_entry; + struct pwr_rail_t *rail; +}; + +int nvbios_iccsense_parse(struct nvkm_bios *, struct nvbios_iccsense *); +#endif diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/Kbuild b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/Kbuild index 64730d5e9351..dbcb0ef21587 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/Kbuild +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/Kbuild @@ -10,6 +10,7 @@ nvkm-y += nvkm/subdev/bios/extdev.o nvkm-y += nvkm/subdev/bios/fan.o nvkm-y += nvkm/subdev/bios/gpio.o nvkm-y += nvkm/subdev/bios/i2c.o +nvkm-y += nvkm/subdev/bios/iccsense.o nvkm-y += nvkm/subdev/bios/image.o nvkm-y += nvkm/subdev/bios/init.o nvkm-y += nvkm/subdev/bios/mxm.o diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/iccsense.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/iccsense.c new file mode 100644 index 000000000000..084328028af1 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/iccsense.c @@ -0,0 +1,100 @@ +/* + * Copyright 2015 Martin Peres + * + * 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: Martin Peres + */ +#include +#include +#include + +static u16 +nvbios_iccsense_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, + u8 *len) +{ + struct bit_entry bit_P; + u16 iccsense; + + if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 || + bit_P.length < 0x2c) + return 0; + + iccsense = nvbios_rd16(bios, bit_P.offset + 0x28); + if (!iccsense) + return 0; + + *ver = nvbios_rd08(bios, iccsense + 0); + switch (*ver) { + case 0x10: + case 0x20: + *hdr = nvbios_rd08(bios, iccsense + 1); + *len = nvbios_rd08(bios, iccsense + 2); + *cnt = nvbios_rd08(bios, iccsense + 3); + return iccsense; + default: + break; + } + + return 0; +} + +int +nvbios_iccsense_parse(struct nvkm_bios *bios, struct nvbios_iccsense *iccsense) +{ + struct nvkm_subdev *subdev = &bios->subdev; + u8 ver, hdr, cnt, len, i; + u16 table, entry; + + table = nvbios_iccsense_table(bios, &ver, &hdr, &cnt, &len); + if (!table || !cnt) + return -EINVAL; + + if (ver != 0x10 && ver != 0x20) { + nvkm_error(subdev, "ICCSENSE version 0x%02x unknown\n", ver); + return -EINVAL; + } + + iccsense->nr_entry = cnt; + iccsense->rail = kmalloc(sizeof(struct pwr_rail_t) * cnt, GFP_KERNEL); + if (!iccsense->rail) + return -ENOMEM; + + for (i = 0; i < cnt; ++i) { + struct pwr_rail_t *rail = &iccsense->rail[i]; + entry = table + hdr + i * len; + + switch(ver) { + case 0x10: + rail->mode = nvbios_rd08(bios, entry + 0x1); + rail->extdev_id = nvbios_rd08(bios, entry + 0x2); + rail->resistor_mohm = nvbios_rd08(bios, entry + 0x3); + rail->rail = nvbios_rd08(bios, entry + 0x4); + break; + case 0x20: + rail->mode = nvbios_rd08(bios, entry); + rail->extdev_id = nvbios_rd08(bios, entry + 0x1); + rail->resistor_mohm = nvbios_rd08(bios, entry + 0x5); + rail->rail = nvbios_rd08(bios, entry + 0x6); + break; + }; + } + + return 0; +} -- 2.30.2