drivers/gpu/drm/nouveau/nvkm/subdev/bios/xpio.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/gpio.h>
  26 #include <subdev/bios/xpio.h>
  27
  28 static u16
  29 dcb_xpiod_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  30 {
  31         u16 data = dcb_gpio_table(bios, ver, hdr, cnt, len);
  32         if (data && *ver >= 0x40 && *hdr >= 0x06) {
  33                 u16 xpio = nv_ro16(bios, data + 0x04);
  34                 if (xpio) {
  35                         *ver = nv_ro08(bios, data + 0x00);
  36                         *hdr = nv_ro08(bios, data + 0x01);
  37                         *cnt = nv_ro08(bios, data + 0x02);
  38                         *len = nv_ro08(bios, data + 0x03);
  39                         return xpio;
  40                 }
  41         }
  42         return 0x0000;
  43 }
  44
  45 u16
  46 dcb_xpio_table(struct nvkm_bios *bios, u8 idx,
  47                u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  48 {
  49         u16 data = dcb_xpiod_table(bios, ver, hdr, cnt, len);
  50         if (data && idx < *cnt) {
  51                 u16 xpio = nv_ro16(bios, data + *hdr + (idx * *len));
  52                 if (xpio) {
  53                         *ver = nv_ro08(bios, data + 0x00);
  54                         *hdr = nv_ro08(bios, data + 0x01);
  55                         *cnt = nv_ro08(bios, data + 0x02);
  56                         *len = nv_ro08(bios, data + 0x03);
  57                         return xpio;
  58                 }
  59         }
  60         return 0x0000;
  61 }
  62
  63 u16
  64 dcb_xpio_parse(struct nvkm_bios *bios, u8 idx,
  65                u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_xpio *info)
  66 {
  67         u16 data = dcb_xpio_table(bios, idx, ver, hdr, cnt, len);
  68         if (data && *len >= 6) {
  69                 info->type = nv_ro08(bios, data + 0x04);
  70                 info->addr = nv_ro08(bios, data + 0x05);
  71                 info->flags = nv_ro08(bios, data + 0x06);
  72         }
  73         return 0x0000;
  74 }