LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/g94.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#include "pad.h"
  26
  27void
  28g94_aux_stat(struct nvkm_i2c *i2c, u32 *hi, u32 *lo, u32 *rq, u32 *tx)
  29{
  30        struct nvkm_device *device = i2c->subdev.device;
  31        u32 intr = nvkm_rd32(device, 0x00e06c);
  32        u32 stat = nvkm_rd32(device, 0x00e068) & intr, i;
  33        for (i = 0, *hi = *lo = *rq = *tx = 0; i < 8; i++) {
  34                if ((stat & (1 << (i * 4)))) *hi |= 1 << i;
  35                if ((stat & (2 << (i * 4)))) *lo |= 1 << i;
  36                if ((stat & (4 << (i * 4)))) *rq |= 1 << i;
  37                if ((stat & (8 << (i * 4)))) *tx |= 1 << i;
  38        }
  39        nvkm_wr32(device, 0x00e06c, intr);
  40}
  41
  42void
  43g94_aux_mask(struct nvkm_i2c *i2c, u32 type, u32 mask, u32 data)
  44{
  45        struct nvkm_device *device = i2c->subdev.device;
  46        u32 temp = nvkm_rd32(device, 0x00e068), i;
  47        for (i = 0; i < 8; i++) {
  48                if (mask & (1 << i)) {
  49                        if (!(data & (1 << i))) {
  50                                temp &= ~(type << (i * 4));
  51                                continue;
  52                        }
  53                        temp |= type << (i * 4);
  54                }
  55        }
  56        nvkm_wr32(device, 0x00e068, temp);
  57}
  58
  59static const struct nvkm_i2c_func
  60g94_i2c = {
  61        .pad_x_new = g94_i2c_pad_x_new,
  62        .pad_s_new = g94_i2c_pad_s_new,
  63        .aux = 4,
  64        .aux_stat = g94_aux_stat,
  65        .aux_mask = g94_aux_mask,
  66};
  67
  68int
  69g94_i2c_new(struct nvkm_device *device, int index, struct nvkm_i2c **pi2c)
  70{
  71        return nvkm_i2c_new_(&g94_i2c, device, index, pi2c);
  72}
  73