drivers/gpu/drm/nouveau/core/subdev/gpio/nvd0.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
  25 #include "priv.h"
  26
  27 struct nvd0_gpio_priv {
  28         struct nouveau_gpio base;
  29 };
  30
  31 void
  32 nvd0_gpio_reset(struct nouveau_gpio *gpio, u8 match)
  33 {
  34         struct nouveau_bios *bios = nouveau_bios(gpio);
  35         struct nvd0_gpio_priv *priv = (void *)gpio;
  36         u8 ver, len;
  37         u16 entry;
  38         int ent = -1;
  39
  40         while ((entry = dcb_gpio_entry(bios, 0, ++ent, &ver, &len))) {
  41                 u32 data = nv_ro32(bios, entry);
  42                 u8  line =   (data & 0x0000003f);
  43                 u8  defs = !!(data & 0x00000080);
  44                 u8  func =   (data & 0x0000ff00) >> 8;
  45                 u8  unk0 =   (data & 0x00ff0000) >> 16;
  46                 u8  unk1 =   (data & 0x1f000000) >> 24;
  47
  48                 if ( func  == DCB_GPIO_UNUSED ||
  49                     (match != DCB_GPIO_UNUSED && match != func))
  50                         continue;
  51
  52                 gpio->set(gpio, 0, func, line, defs);
  53
  54                 nv_mask(priv, 0x00d610 + (line * 4), 0xff, unk0);
  55                 if (unk1--)
  56                         nv_mask(priv, 0x00d740 + (unk1 * 4), 0xff, line);
  57         }
  58 }
  59
  60 int
  61 nvd0_gpio_drive(struct nouveau_gpio *gpio, int line, int dir, int out)
  62 {
  63         u32 data = ((dir ^ 1) << 13) | (out << 12);
  64         nv_mask(gpio, 0x00d610 + (line * 4), 0x00003000, data);
  65         nv_mask(gpio, 0x00d604, 0x00000001, 0x00000001); /* update? */
  66         return 0;
  67 }
  68
  69 int
  70 nvd0_gpio_sense(struct nouveau_gpio *gpio, int line)
  71 {
  72         return !!(nv_rd32(gpio, 0x00d610 + (line * 4)) & 0x00004000);
  73 }
  74
  75 static int
  76 nvd0_gpio_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
  77                struct nouveau_oclass *oclass, void *data, u32 size,
  78                struct nouveau_object **pobject)
  79 {
  80         struct nvd0_gpio_priv *priv;
  81         int ret;
  82
  83         ret = nouveau_gpio_create(parent, engine, oclass, &priv);
  84         *pobject = nv_object(priv);
  85         if (ret)
  86                 return ret;
  87
  88         priv->base.reset = nvd0_gpio_reset;
  89         priv->base.drive = nvd0_gpio_drive;
  90         priv->base.sense = nvd0_gpio_sense;
  91         return 0;
  92 }
  93
  94 struct nouveau_oclass *
  95 nvd0_gpio_oclass = &(struct nouveau_gpio_impl) {
  96         .base.handle = NV_SUBDEV(GPIO, 0xd0),
  97         .base.ofuncs = &(struct nouveau_ofuncs) {
  98                 .ctor = nvd0_gpio_ctor,
  99                 .dtor = nv50_gpio_dtor,
 100                 .init = nv50_gpio_init,
 101                 .fini = nv50_gpio_fini,
 102         },
 103         .lines = 32,
 104         .intr_stat = nv92_gpio_intr_stat,
 105         .intr_mask = nv92_gpio_intr_mask,
 106 }.base;