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 <subdev/bios.h>
 25#include <subdev/bios/dcb.h>
 26#include <subdev/bios/gpio.h>
 27#include <subdev/bios/xpio.h>
 28
 29u16
 30dcb_gpio_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
 31{
 32	u16 data = 0x0000;
 33	u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
 34	if (dcb) {
 35		if (*ver >= 0x30 && *hdr >= 0x0c)
 36			data = nvbios_rd16(bios, dcb + 0x0a);
 37		else
 38		if (*ver >= 0x22 && nvbios_rd08(bios, dcb - 1) >= 0x13)
 39			data = nvbios_rd16(bios, dcb - 0x0f);
 40
 41		if (data) {
 42			*ver = nvbios_rd08(bios, data + 0x00);
 43			if (*ver < 0x30) {
 44				*hdr = 3;
 45				*cnt = nvbios_rd08(bios, data + 0x02);
 46				*len = nvbios_rd08(bios, data + 0x01);
 47			} else
 48			if (*ver <= 0x41) {
 49				*hdr = nvbios_rd08(bios, data + 0x01);
 50				*cnt = nvbios_rd08(bios, data + 0x02);
 51				*len = nvbios_rd08(bios, data + 0x03);
 52			} else {
 53				data = 0x0000;
 54			}
 55		}
 56	}
 57	return data;
 58}
 59
 60u16
 61dcb_gpio_entry(struct nvkm_bios *bios, int idx, int ent, u8 *ver, u8 *len)
 62{
 63	u8  hdr, cnt, xver; /* use gpio version for xpio entry parsing */
 64	u16 gpio;
 65
 66	if (!idx--)
 67		gpio = dcb_gpio_table(bios, ver, &hdr, &cnt, len);
 68	else
 69		gpio = dcb_xpio_table(bios, idx, &xver, &hdr, &cnt, len);
 70
 71	if (gpio && ent < cnt)
 72		return gpio + hdr + (ent * *len);
 73
 74	return 0x0000;
 75}
 76
 77u16
 78dcb_gpio_parse(struct nvkm_bios *bios, int idx, int ent, u8 *ver, u8 *len,
 79	       struct dcb_gpio_func *gpio)
 80{
 81	u16 data = dcb_gpio_entry(bios, idx, ent, ver, len);
 82	if (data) {
 83		if (*ver < 0x40) {
 84			u16 info = nvbios_rd16(bios, data);
 85			*gpio = (struct dcb_gpio_func) {
 86				.line = (info & 0x001f) >> 0,
 87				.func = (info & 0x07e0) >> 5,
 88				.log[0] = (info & 0x1800) >> 11,
 89				.log[1] = (info & 0x6000) >> 13,
 90				.param = !!(info & 0x8000),
 91			};
 92		} else
 93		if (*ver < 0x41) {
 94			u32 info = nvbios_rd32(bios, data);
 95			*gpio = (struct dcb_gpio_func) {
 96				.line = (info & 0x0000001f) >> 0,
 97				.func = (info & 0x0000ff00) >> 8,
 98				.log[0] = (info & 0x18000000) >> 27,
 99				.log[1] = (info & 0x60000000) >> 29,
100				.param = !!(info & 0x80000000),
101			};
102		} else {
103			u32 info = nvbios_rd32(bios, data + 0);
104			u8 info1 = nvbios_rd32(bios, data + 4);
105			*gpio = (struct dcb_gpio_func) {
106				.line = (info & 0x0000003f) >> 0,
107				.func = (info & 0x0000ff00) >> 8,
108				.log[0] = (info1 & 0x30) >> 4,
109				.log[1] = (info1 & 0xc0) >> 6,
110				.param = !!(info & 0x80000000),
111			};
112		}
113	}
114
115	return data;
116}
117
118u16
119dcb_gpio_match(struct nvkm_bios *bios, int idx, u8 func, u8 line,
120	       u8 *ver, u8 *len, struct dcb_gpio_func *gpio)
121{
122	u8  hdr, cnt, i = 0;
123	u16 data;
124
125	while ((data = dcb_gpio_parse(bios, idx, i++, ver, len, gpio))) {
126		if ((line == 0xff || line == gpio->line) &&
127		    (func == 0xff || func == gpio->func))
128			return data;
129	}
130
131	/* DCB 2.2, fixed TVDAC GPIO data */
132	if ((data = dcb_table(bios, ver, &hdr, &cnt, len))) {
133		if (*ver >= 0x22 && *ver < 0x30 && func == DCB_GPIO_TVDAC0) {
134			u8 conf = nvbios_rd08(bios, data - 5);
135			u8 addr = nvbios_rd08(bios, data - 4);
136			if (conf & 0x01) {
137				*gpio = (struct dcb_gpio_func) {
138					.func = DCB_GPIO_TVDAC0,
139					.line = addr >> 4,
140					.log[0] = !!(conf & 0x02),
141					.log[1] =  !(conf & 0x02),
142				};
143				*ver = 0x00;
144				return data;
145			}
146		}
147	}
148
149	return 0x0000;
150}