LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/bios/gpio.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 <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}
 151