drivers/gpu/drm/nouveau/nvkm/subdev/gpio/gf110.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
  26 void
  27 gf110_gpio_reset(struct nvkm_gpio *gpio, u8 match)
  28 {
  29         struct nvkm_bios *bios = nvkm_bios(gpio);
  30         u8 ver, len;
  31         u16 entry;
  32         int ent = -1;
  33
  34         while ((entry = dcb_gpio_entry(bios, 0, ++ent, &ver, &len))) {
  35                 u32 data = nv_ro32(bios, entry);
  36                 u8  line =   (data & 0x0000003f);
  37                 u8  defs = !!(data & 0x00000080);
  38                 u8  func =   (data & 0x0000ff00) >> 8;
  39                 u8  unk0 =   (data & 0x00ff0000) >> 16;
  40                 u8  unk1 =   (data & 0x1f000000) >> 24;
  41
  42                 if ( func  == DCB_GPIO_UNUSED ||
  43                     (match != DCB_GPIO_UNUSED && match != func))
  44                         continue;
  45
  46                 gpio->set(gpio, 0, func, line, defs);
  47
  48                 nv_mask(gpio, 0x00d610 + (line * 4), 0xff, unk0);
  49                 if (unk1--)
  50                         nv_mask(gpio, 0x00d740 + (unk1 * 4), 0xff, line);
  51         }
  52 }
  53
  54 int
  55 gf110_gpio_drive(struct nvkm_gpio *gpio, int line, int dir, int out)
  56 {
  57         u32 data = ((dir ^ 1) << 13) | (out << 12);
  58         nv_mask(gpio, 0x00d610 + (line * 4), 0x00003000, data);
  59         nv_mask(gpio, 0x00d604, 0x00000001, 0x00000001); /* update? */
  60         return 0;
  61 }
  62
  63 int
  64 gf110_gpio_sense(struct nvkm_gpio *gpio, int line)
  65 {
  66         return !!(nv_rd32(gpio, 0x00d610 + (line * 4)) & 0x00004000);
  67 }
  68
  69 struct nvkm_oclass *
  70 gf110_gpio_oclass = &(struct nvkm_gpio_impl) {
  71         .base.handle = NV_SUBDEV(GPIO, 0xd0),
  72         .base.ofuncs = &(struct nvkm_ofuncs) {
  73                 .ctor = _nvkm_gpio_ctor,
  74                 .dtor = _nvkm_gpio_dtor,
  75                 .init = _nvkm_gpio_init,
  76                 .fini = _nvkm_gpio_fini,
  77         },
  78         .lines = 32,
  79         .intr_stat = g94_gpio_intr_stat,
  80         .intr_mask = g94_gpio_intr_mask,
  81         .drive = gf110_gpio_drive,
  82         .sense = gf110_gpio_sense,
  83         .reset = gf110_gpio_reset,
  84 }.base;