99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
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/*
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* Copyright 2013 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/volt.h>
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#include <subdev/bios.h>
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#include <subdev/bios/gpio.h>
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#include <subdev/gpio.h>
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#include "priv.h"
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static const u8 tags[] = {
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DCB_GPIO_VID0, DCB_GPIO_VID1, DCB_GPIO_VID2, DCB_GPIO_VID3,
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DCB_GPIO_VID4, DCB_GPIO_VID5, DCB_GPIO_VID6, DCB_GPIO_VID7,
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};
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int
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nvkm_voltgpio_get(struct nvkm_volt *volt)
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{
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struct nvkm_gpio *gpio = volt->subdev.device->gpio;
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u8 vid = 0;
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int i;
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for (i = 0; i < ARRAY_SIZE(tags); i++) {
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if (volt->vid_mask & (1 << i)) {
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int ret = nvkm_gpio_get(gpio, 0, tags[i], 0xff);
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if (ret < 0)
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return ret;
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vid |= ret << i;
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}
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}
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return vid;
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}
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int
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nvkm_voltgpio_set(struct nvkm_volt *volt, u8 vid)
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{
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struct nvkm_gpio *gpio = volt->subdev.device->gpio;
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int i;
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for (i = 0; i < ARRAY_SIZE(tags); i++, vid >>= 1) {
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if (volt->vid_mask & (1 << i)) {
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int ret = nvkm_gpio_set(gpio, 0, tags[i], 0xff, vid & 1);
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if (ret < 0)
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return ret;
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}
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}
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return 0;
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}
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int
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nvkm_voltgpio_init(struct nvkm_volt *volt)
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{
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struct nvkm_subdev *subdev = &volt->subdev;
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struct nvkm_gpio *gpio = subdev->device->gpio;
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struct dcb_gpio_func func;
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int i;
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/* check we have gpio function info for each vid bit. on some
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* boards (ie. nvs295) the vid mask has more bits than there
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* are valid gpio functions... from traces, nvidia appear to
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* just touch the existing ones, so let's mask off the invalid
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* bits and continue with life
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*/
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for (i = 0; i < ARRAY_SIZE(tags); i++) {
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if (volt->vid_mask & (1 << i)) {
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int ret = nvkm_gpio_find(gpio, 0, tags[i], 0xff, &func);
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if (ret) {
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if (ret != -ENOENT)
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return ret;
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nvkm_debug(subdev, "VID bit %d has no GPIO\n", i);
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volt->vid_mask &= ~(1 << i);
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}
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}
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}
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return 0;
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}
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