2 * Copyright 2013 Red Hat Inc.
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5 * copy of this software and associated documentation files (the "Software"),
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8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
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24 #include <subdev/volt.h>
25 #include <subdev/bios.h>
26 #include <subdev/bios/gpio.h>
27 #include <subdev/gpio.h>
29 static const u8 tags[] = {
30 DCB_GPIO_VID0, DCB_GPIO_VID1, DCB_GPIO_VID2, DCB_GPIO_VID3,
31 DCB_GPIO_VID4, DCB_GPIO_VID5, DCB_GPIO_VID6, DCB_GPIO_VID7,
35 nvkm_voltgpio_get(struct nvkm_volt *volt)
37 struct nvkm_gpio *gpio = volt->subdev.device->gpio;
41 for (i = 0; i < ARRAY_SIZE(tags); i++) {
42 if (volt->vid_mask & (1 << i)) {
43 int ret = nvkm_gpio_get(gpio, 0, tags[i], 0xff);
54 nvkm_voltgpio_set(struct nvkm_volt *volt, u8 vid)
56 struct nvkm_gpio *gpio = volt->subdev.device->gpio;
59 for (i = 0; i < ARRAY_SIZE(tags); i++, vid >>= 1) {
60 if (volt->vid_mask & (1 << i)) {
61 int ret = nvkm_gpio_set(gpio, 0, tags[i], 0xff, vid & 1);
71 nvkm_voltgpio_init(struct nvkm_volt *volt)
73 struct nvkm_subdev *subdev = &volt->subdev;
74 struct nvkm_gpio *gpio = subdev->device->gpio;
75 struct dcb_gpio_func func;
78 /* check we have gpio function info for each vid bit. on some
79 * boards (ie. nvs295) the vid mask has more bits than there
80 * are valid gpio functions... from traces, nvidia appear to
81 * just touch the existing ones, so let's mask off the invalid
82 * bits and continue with life
84 for (i = 0; i < ARRAY_SIZE(tags); i++) {
85 if (volt->vid_mask & (1 << i)) {
86 int ret = nvkm_gpio_find(gpio, 0, tags[i], 0xff, &func);
90 nvkm_debug(subdev, "VID bit %d has no GPIO\n", i);
91 volt->vid_mask &= ~(1 << i);