drivers/gpu/drm/nouveau/nv50_gpio.c

   1 /*
   2  * Copyright 2010 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 "drmP.h"
  26 #include "nouveau_drv.h"
  27 #include "nouveau_hw.h"
  28
  29 static int
  30 nv50_gpio_location(struct dcb_gpio_entry *gpio, uint32_t *reg, uint32_t *shift)
  31 {
  32         const uint32_t nv50_gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 };
  33
  34         if (gpio->line > 32)
  35                 return -EINVAL;
  36
  37         *reg = nv50_gpio_reg[gpio->line >> 3];
  38         *shift = (gpio->line & 7) << 2;
  39         return 0;
  40 }
  41
  42 int
  43 nv50_gpio_get(struct drm_device *dev, enum dcb_gpio_tag tag)
  44 {
  45         struct dcb_gpio_entry *gpio;
  46         uint32_t r, s, v;
  47
  48         gpio = nouveau_bios_gpio_entry(dev, tag);
  49         if (!gpio)
  50                 return -ENOENT;
  51
  52         if (nv50_gpio_location(gpio, &r, &s))
  53                 return -EINVAL;
  54
  55         v = nv_rd32(dev, r) >> (s + 2);
  56         return ((v & 1) == (gpio->state[1] & 1));
  57 }
  58
  59 int
  60 nv50_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state)
  61 {
  62         struct dcb_gpio_entry *gpio;
  63         uint32_t r, s, v;
  64
  65         gpio = nouveau_bios_gpio_entry(dev, tag);
  66         if (!gpio)
  67                 return -ENOENT;
  68
  69         if (nv50_gpio_location(gpio, &r, &s))
  70                 return -EINVAL;
  71
  72         v  = nv_rd32(dev, r) & ~(0x3 << s);
  73         v |= (gpio->state[state] ^ 2) << s;
  74         nv_wr32(dev, r, v);
  75         return 0;
  76 }