nv50.c

  1/*
  2 * Copyright 2012 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 * Authors: Ben Skeggs
 23 */
 24#include "priv.h"
 25
 26void
 27nv50_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		static const u32 regs[] = { 0xe100, 0xe28c };
 37		u32 data = nvbios_rd32(bios, entry);
 38		u8  line =   (data & 0x0000001f);
 39		u8  func =   (data & 0x0000ff00) >> 8;
 40		u8  defs = !!(data & 0x01000000);
 41		u8  unk0 = !!(data & 0x02000000);
 42		u8  unk1 = !!(data & 0x04000000);
 43		u32 val = (unk1 << 16) | unk0;
 44		u32 reg = regs[line >> 4];
 45		u32 lsh = line & 0x0f;
 46
 47		if ( func  == DCB_GPIO_UNUSED ||
 48		    (match != DCB_GPIO_UNUSED && match != func))
 49			continue;
 50
 51		nvkm_gpio_set(gpio, 0, func, line, defs);
 52
 53		nvkm_mask(device, reg, 0x00010001 << lsh, val << lsh);
 54	}
 55}
 56
 57static int
 58nv50_gpio_location(int line, u32 *reg, u32 *shift)
 59{
 60	const u32 nv50_gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 };
 61
 62	if (line >= 32)
 63		return -EINVAL;
 64
 65	*reg = nv50_gpio_reg[line >> 3];
 66	*shift = (line & 7) << 2;
 67	return 0;
 68}
 69
 70int
 71nv50_gpio_drive(struct nvkm_gpio *gpio, int line, int dir, int out)
 72{
 73	struct nvkm_device *device = gpio->subdev.device;
 74	u32 reg, shift;
 75
 76	if (nv50_gpio_location(line, &reg, &shift))
 77		return -EINVAL;
 78
 79	nvkm_mask(device, reg, 3 << shift, (((dir ^ 1) << 1) | out) << shift);
 80	return 0;
 81}
 82
 83int
 84nv50_gpio_sense(struct nvkm_gpio *gpio, int line)
 85{
 86	struct nvkm_device *device = gpio->subdev.device;
 87	u32 reg, shift;
 88
 89	if (nv50_gpio_location(line, &reg, &shift))
 90		return -EINVAL;
 91
 92	return !!(nvkm_rd32(device, reg) & (4 << shift));
 93}
 94
 95static void
 96nv50_gpio_intr_stat(struct nvkm_gpio *gpio, u32 *hi, u32 *lo)
 97{
 98	struct nvkm_device *device = gpio->subdev.device;
 99	u32 intr = nvkm_rd32(device, 0x00e054);
100	u32 stat = nvkm_rd32(device, 0x00e050) & intr;
101	*lo = (stat & 0xffff0000) >> 16;
102	*hi = (stat & 0x0000ffff);
103	nvkm_wr32(device, 0x00e054, intr);
104}
105
106static void
107nv50_gpio_intr_mask(struct nvkm_gpio *gpio, u32 type, u32 mask, u32 data)
108{
109	struct nvkm_device *device = gpio->subdev.device;
110	u32 inte = nvkm_rd32(device, 0x00e050);
111	if (type & NVKM_GPIO_LO)
112		inte = (inte & ~(mask << 16)) | (data << 16);
113	if (type & NVKM_GPIO_HI)
114		inte = (inte & ~mask) | data;
115	nvkm_wr32(device, 0x00e050, inte);
116}
117
118static const struct nvkm_gpio_func
119nv50_gpio = {
120	.lines = 16,
121	.intr_stat = nv50_gpio_intr_stat,
122	.intr_mask = nv50_gpio_intr_mask,
123	.drive = nv50_gpio_drive,
124	.sense = nv50_gpio_sense,
125	.reset = nv50_gpio_reset,
126};
127
128int
129nv50_gpio_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
130	      struct nvkm_gpio **pgpio)
131{
132	return nvkm_gpio_new_(&nv50_gpio, device, type, inst, pgpio);
133}