release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/gpu/drm/nouveau/nv10_gpio.c

   1 /*
   2  * Copyright (C) 2009 Francisco Jerez.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial
  15  * portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  */
  26
  27 #include "drmP.h"
  28 #include "nouveau_drv.h"
  29 #include "nouveau_hw.h"
  30
  31 static bool
  32 get_gpio_location(struct dcb_gpio_entry *ent, uint32_t *reg, uint32_t *shift,
  33                   uint32_t *mask)
  34 {
  35         if (ent->line < 2) {
  36                 *reg = NV_PCRTC_GPIO;
  37                 *shift = ent->line * 16;
  38                 *mask = 0x11;
  39
  40         } else if (ent->line < 10) {
  41                 *reg = NV_PCRTC_GPIO_EXT;
  42                 *shift = (ent->line - 2) * 4;
  43                 *mask = 0x3;
  44
  45         } else if (ent->line < 14) {
  46                 *reg = NV_PCRTC_850;
  47                 *shift = (ent->line - 10) * 4;
  48                 *mask = 0x3;
  49
  50         } else {
  51                 return false;
  52         }
  53
  54         return true;
  55 }
  56
  57 int
  58 nv10_gpio_get(struct drm_device *dev, enum dcb_gpio_tag tag)
  59 {
  60         struct dcb_gpio_entry *ent = nouveau_bios_gpio_entry(dev, tag);
  61         uint32_t reg, shift, mask, value;
  62
  63         if (!ent)
  64                 return -ENODEV;
  65
  66         if (!get_gpio_location(ent, &reg, &shift, &mask))
  67                 return -ENODEV;
  68
  69         value = NVReadCRTC(dev, 0, reg) >> shift;
  70
  71         return (ent->invert ? 1 : 0) ^ (value & 1);
  72 }
  73
  74 int
  75 nv10_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state)
  76 {
  77         struct dcb_gpio_entry *ent = nouveau_bios_gpio_entry(dev, tag);
  78         uint32_t reg, shift, mask, value;
  79
  80         if (!ent)
  81                 return -ENODEV;
  82
  83         if (!get_gpio_location(ent, &reg, &shift, &mask))
  84                 return -ENODEV;
  85
  86         value = ((ent->invert ? 1 : 0) ^ (state ? 1 : 0)) << shift;
  87         mask = ~(mask << shift);
  88
  89         NVWriteCRTC(dev, 0, reg, value | (NVReadCRTC(dev, 0, reg) & mask));
  90
  91         return 0;
  92 }