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
  29 u16
  30 dcb_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 = nv_ro16(bios, dcb + 0x0a);
  37                 else
  38                 if (*ver >= 0x22 && nv_ro08(bios, dcb - 1) >= 0x13)
  39                         data = nv_ro16(bios, dcb - 0x0f);
  40
  41                 if (data) {
  42                         *ver = nv_ro08(bios, data + 0x00);
  43                         if (*ver < 0x30) {
  44                                 *hdr = 3;
  45                                 *cnt = nv_ro08(bios, data + 0x02);
  46                                 *len = nv_ro08(bios, data + 0x01);
  47                         } else
  48                         if (*ver <= 0x41) {
  49                                 *hdr = nv_ro08(bios, data + 0x01);
  50                                 *cnt = nv_ro08(bios, data + 0x02);
  51                                 *len = nv_ro08(bios, data + 0x03);
  52                         } else {
  53                                 data = 0x0000;
  54                         }
  55                 }
  56         }
  57         return data;
  58 }
  59
  60 u16
  61 dcb_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
  77 u16
  78 dcb_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 = nv_ro16(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 = nv_ro32(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 = nv_ro32(bios, data + 0);
 104                         u8 info1 = nv_ro32(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
 118 u16
 119 dcb_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 = nv_ro08(bios, data - 5);
 135                         u8 addr = nv_ro08(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 }