LXR linux/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
  27struct nvd0_gpio_priv {
  28        struct nouveau_gpio base;
  29};
  30
  31void
  32nvd0_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
  60int
  61nvd0_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
  69int
  70nvd0_gpio_sense(struct nouveau_gpio *gpio, int line)
  71{
  72        return !!(nv_rd32(gpio, 0x00d610 + (line * 4)) & 0x00004000);
  73}
  74
  75static int
  76nvd0_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, 32, &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        priv->base.events->priv = priv;
  92        priv->base.events->enable = nv50_gpio_intr_enable;
  93        priv->base.events->disable = nv50_gpio_intr_disable;
  94        nv_subdev(priv)->intr = nv50_gpio_intr;
  95        return 0;
  96}
  97
  98struct nouveau_oclass
  99nvd0_gpio_oclass = {
 100        .handle = NV_SUBDEV(GPIO, 0xd0),
 101        .ofuncs = &(struct nouveau_ofuncs) {
 102                .ctor = nvd0_gpio_ctor,
 103                .dtor = nv50_gpio_dtor,
 104                .init = nv50_gpio_init,
 105                .fini = nv50_gpio_fini,
 106        },
 107};
 108