drivers/gpu/drm/nouveau/nvkm/subdev/gpio/nv50.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 nv50_gpio_reset(struct nvkm_gpio *gpio, u8 match)
  28 {
  29         struct nvkm_device *device = gpio->subdev.device;
  30         struct nvkm_bios *bios = device->bios;
  31         u8 ver, len;
  32         u16 entry;
  33         int ent = -1;
  34
  35         while ((entry = dcb_gpio_entry(bios, 0, ++ent, &ver, &len))) {
  36                 static const u32 regs[] = { 0xe100, 0xe28c };
  37                 u32 data = nvbios_rd32(bios, entry);
  38                 u8  line =   (data & 0x0000001f);
  39                 u8  func =   (data & 0x0000ff00) >> 8;
  40                 u8  defs = !!(data & 0x01000000);
  41                 u8  unk0 = !!(data & 0x02000000);
  42                 u8  unk1 = !!(data & 0x04000000);
  43                 u32 val = (unk1 << 16) | unk0;
  44                 u32 reg = regs[line >> 4];
  45                 u32 lsh = line & 0x0f;
  46
  47                 if ( func  == DCB_GPIO_UNUSED ||
  48                     (match != DCB_GPIO_UNUSED && match != func))
  49                         continue;
  50
  51                 nvkm_gpio_set(gpio, 0, func, line, defs);
  52
  53                 nvkm_mask(device, reg, 0x00010001 << lsh, val << lsh);
  54         }
  55 }
  56
  57 static int
  58 nv50_gpio_location(int line, u32 *reg, u32 *shift)
  59 {
  60         const u32 nv50_gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 };
  61
  62         if (line >= 32)
  63                 return -EINVAL;
  64
  65         *reg = nv50_gpio_reg[line >> 3];
  66         *shift = (line & 7) << 2;
  67         return 0;
  68 }
  69
  70 int
  71 nv50_gpio_drive(struct nvkm_gpio *gpio, int line, int dir, int out)
  72 {
  73         struct nvkm_device *device = gpio->subdev.device;
  74         u32 reg, shift;
  75
  76         if (nv50_gpio_location(line, &reg, &shift))
  77                 return -EINVAL;
  78
  79         nvkm_mask(device, reg, 3 << shift, (((dir ^ 1) << 1) | out) << shift);
  80         return 0;
  81 }
  82
  83 int
  84 nv50_gpio_sense(struct nvkm_gpio *gpio, int line)
  85 {
  86         struct nvkm_device *device = gpio->subdev.device;
  87         u32 reg, shift;
  88
  89         if (nv50_gpio_location(line, &reg, &shift))
  90                 return -EINVAL;
  91
  92         return !!(nvkm_rd32(device, reg) & (4 << shift));
  93 }
  94
  95 static void
  96 nv50_gpio_intr_stat(struct nvkm_gpio *gpio, u32 *hi, u32 *lo)
  97 {
  98         struct nvkm_device *device = gpio->subdev.device;
  99         u32 intr = nvkm_rd32(device, 0x00e054);
 100         u32 stat = nvkm_rd32(device, 0x00e050) & intr;
 101         *lo = (stat & 0xffff0000) >> 16;
 102         *hi = (stat & 0x0000ffff);
 103         nvkm_wr32(device, 0x00e054, intr);
 104 }
 105
 106 static void
 107 nv50_gpio_intr_mask(struct nvkm_gpio *gpio, u32 type, u32 mask, u32 data)
 108 {
 109         struct nvkm_device *device = gpio->subdev.device;
 110         u32 inte = nvkm_rd32(device, 0x00e050);
 111         if (type & NVKM_GPIO_LO)
 112                 inte = (inte & ~(mask << 16)) | (data << 16);
 113         if (type & NVKM_GPIO_HI)
 114                 inte = (inte & ~mask) | data;
 115         nvkm_wr32(device, 0x00e050, inte);
 116 }
 117
 118 static const struct nvkm_gpio_func
 119 nv50_gpio = {
 120         .lines = 16,
 121         .intr_stat = nv50_gpio_intr_stat,
 122         .intr_mask = nv50_gpio_intr_mask,
 123         .drive = nv50_gpio_drive,
 124         .sense = nv50_gpio_sense,
 125         .reset = nv50_gpio_reset,
 126 };
 127
 128 int
 129 nv50_gpio_new(struct nvkm_device *device, int index, struct nvkm_gpio **pgpio)
 130 {
 131         return nvkm_gpio_new_(&nv50_gpio, device, index, pgpio);
 132 }