1/*
  2 * Copyright 2021 Red Hat Inc.
  3 *
  4 * Permission is hereby granted, free of charge, to any person obtaining a
  5 * copy of this software and associated documentation files (the "Software"),
  6 * to deal in the Software without restriction, including without limitation
  7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  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:
 10 *
 11 * The above copyright notice and this permission notice shall be included in
 12 * all copies or substantial portions of the Software.
 13 *
 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 20 * OTHER DEALINGS IN THE SOFTWARE.
 21 */
 22#include "priv.h"
 23
 24#include <subdev/gsp.h>
 25
 26static void
 27ga102_gpio_reset(struct nvkm_gpio *gpio, u8 match)
 28{
 29	struct nvkm_device *device = gpio->subdev.device;
 30	struct nvkm_bios *bios = device->bios;
 31	u8 ver, len;
 32	u16 entry;
 33	int ent = -1;
 34
 35	while ((entry = dcb_gpio_entry(bios, 0, ++ent, &ver, &len))) {
 36		u32 data = nvbios_rd32(bios, entry);
 37		u8  line =   (data & 0x0000003f);
 38		u8  defs = !!(data & 0x00000080);
 39		u8  func =   (data & 0x0000ff00) >> 8;
 40		u8  unk0 =   (data & 0x00ff0000) >> 16;
 41		u8  unk1 =   (data & 0x1f000000) >> 24;
 42
 43		if ( func  == DCB_GPIO_UNUSED ||
 44		    (match != DCB_GPIO_UNUSED && match != func))
 45			continue;
 46
 47		nvkm_gpio_set(gpio, 0, func, line, defs);
 48
 49		nvkm_mask(device, 0x021200 + (line * 4), 0xff, unk0);
 50		if (unk1--)
 51			nvkm_mask(device, 0x00d740 + (unk1 * 4), 0xff, line);
 52	}
 53}
 54
 55static int
 56ga102_gpio_drive(struct nvkm_gpio *gpio, int line, int dir, int out)
 57{
 58	struct nvkm_device *device = gpio->subdev.device;
 59	u32 data = ((dir ^ 1) << 13) | (out << 12);
 60	nvkm_mask(device, 0x021200 + (line * 4), 0x00003000, data);
 61	nvkm_mask(device, 0x00d604, 0x00000001, 0x00000001); /* update? */
 62	return 0;
 63}
 64
 65static int
 66ga102_gpio_sense(struct nvkm_gpio *gpio, int line)
 67{
 68	struct nvkm_device *device = gpio->subdev.device;
 69	return !!(nvkm_rd32(device, 0x021200 + (line * 4)) & 0x00004000);
 70}
 71
 72static void
 73ga102_gpio_intr_stat(struct nvkm_gpio *gpio, u32 *hi, u32 *lo)
 74{
 75	struct nvkm_device *device = gpio->subdev.device;
 76	u32 intr0 = nvkm_rd32(device, 0x021640);
 77	u32 intr1 = nvkm_rd32(device, 0x02164c);
 78	u32 stat0 = nvkm_rd32(device, 0x021648) & intr0;
 79	u32 stat1 = nvkm_rd32(device, 0x021654) & intr1;
 80	*lo = (stat1 & 0xffff0000) | (stat0 >> 16);
 81	*hi = (stat1 << 16) | (stat0 & 0x0000ffff);
 82	nvkm_wr32(device, 0x021640, intr0);
 83	nvkm_wr32(device, 0x02164c, intr1);
 84}
 85
 86static void
 87ga102_gpio_intr_mask(struct nvkm_gpio *gpio, u32 type, u32 mask, u32 data)
 88{
 89	struct nvkm_device *device = gpio->subdev.device;
 90	u32 inte0 = nvkm_rd32(device, 0x021648);
 91	u32 inte1 = nvkm_rd32(device, 0x021654);
 92	if (type & NVKM_GPIO_LO)
 93		inte0 = (inte0 & ~(mask << 16)) | (data << 16);
 94	if (type & NVKM_GPIO_HI)
 95		inte0 = (inte0 & ~(mask & 0xffff)) | (data & 0xffff);
 96	mask >>= 16;
 97	data >>= 16;
 98	if (type & NVKM_GPIO_LO)
 99		inte1 = (inte1 & ~(mask << 16)) | (data << 16);
100	if (type & NVKM_GPIO_HI)
101		inte1 = (inte1 & ~mask) | data;
102	nvkm_wr32(device, 0x021648, inte0);
103	nvkm_wr32(device, 0x021654, inte1);
104}
105
106static const struct nvkm_gpio_func
107ga102_gpio = {
108	.lines = 32,
109	.intr_stat = ga102_gpio_intr_stat,
110	.intr_mask = ga102_gpio_intr_mask,
111	.drive = ga102_gpio_drive,
112	.sense = ga102_gpio_sense,
113	.reset = ga102_gpio_reset,
114};
115
116int
117ga102_gpio_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
118	       struct nvkm_gpio **pgpio)
119{
120	if (nvkm_gsp_rm(device->gsp))
121		return -ENODEV;
122
123	return nvkm_gpio_new_(&ga102_gpio, device, type, inst, pgpio);
124}