LXR linux/drivers/gpu/drm/nouveau/core/subdev/i2c/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 "nv50.h"
  26
  27static int
  28nvd0_i2c_sense_scl(struct nouveau_i2c_port *base)
  29{
  30        struct nv50_i2c_priv *priv = (void *)nv_object(base)->engine;
  31        struct nv50_i2c_port *port = (void *)base;
  32        return !!(nv_rd32(priv, port->addr) & 0x00000010);
  33}
  34
  35static int
  36nvd0_i2c_sense_sda(struct nouveau_i2c_port *base)
  37{
  38        struct nv50_i2c_priv *priv = (void *)nv_object(base)->engine;
  39        struct nv50_i2c_port *port = (void *)base;
  40        return !!(nv_rd32(priv, port->addr) & 0x00000020);
  41}
  42
  43static const struct nouveau_i2c_func
  44nvd0_i2c_func = {
  45        .acquire   = nv94_i2c_acquire,
  46        .release   = nv94_i2c_release,
  47        .drive_scl = nv50_i2c_drive_scl,
  48        .drive_sda = nv50_i2c_drive_sda,
  49        .sense_scl = nvd0_i2c_sense_scl,
  50        .sense_sda = nvd0_i2c_sense_sda,
  51};
  52
  53static int
  54nvd0_i2c_port_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
  55                   struct nouveau_oclass *oclass, void *data, u32 index,
  56                   struct nouveau_object **pobject)
  57{
  58        struct dcb_i2c_entry *info = data;
  59        struct nv50_i2c_port *port;
  60        int ret;
  61
  62        ret = nouveau_i2c_port_create(parent, engine, oclass, index,
  63                                     &nouveau_i2c_bit_algo, &port);
  64        *pobject = nv_object(port);
  65        if (ret)
  66                return ret;
  67
  68        port->base.func = &nvd0_i2c_func;
  69        port->state = 0x00000007;
  70        port->addr = 0x00d014 + (info->drive * 0x20);
  71        if (info->share != DCB_I2C_UNUSED) {
  72                port->ctrl = 0x00e500 + (info->share * 0x50);
  73                port->data = 0x0000e001;
  74        }
  75        return 0;
  76}
  77
  78static struct nouveau_oclass
  79nvd0_i2c_sclass[] = {
  80        { .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_BIT),
  81          .ofuncs = &(struct nouveau_ofuncs) {
  82                  .ctor = nvd0_i2c_port_ctor,
  83                  .dtor = _nouveau_i2c_port_dtor,
  84                  .init = nv50_i2c_port_init,
  85                  .fini = _nouveau_i2c_port_fini,
  86          },
  87        },
  88        { .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_AUX),
  89          .ofuncs = &(struct nouveau_ofuncs) {
  90                  .ctor = nv94_aux_port_ctor,
  91                  .dtor = _nouveau_i2c_port_dtor,
  92                  .init = _nouveau_i2c_port_init,
  93                  .fini = _nouveau_i2c_port_fini,
  94          },
  95        },
  96        {}
  97};
  98
  99static int
 100nvd0_i2c_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 101              struct nouveau_oclass *oclass, void *data, u32 size,
 102              struct nouveau_object **pobject)
 103{
 104        struct nv50_i2c_priv *priv;
 105        int ret;
 106
 107        ret = nouveau_i2c_create(parent, engine, oclass, nvd0_i2c_sclass, &priv);
 108        *pobject = nv_object(priv);
 109        if (ret)
 110                return ret;
 111
 112        return 0;
 113}
 114
 115struct nouveau_oclass
 116nvd0_i2c_oclass = {
 117        .handle = NV_SUBDEV(I2C, 0xd0),
 118        .ofuncs = &(struct nouveau_ofuncs) {
 119                .ctor = nvd0_i2c_ctor,
 120                .dtor = _nouveau_i2c_dtor,
 121                .init = _nouveau_i2c_init,
 122                .fini = _nouveau_i2c_fini,
 123        },
 124};
 125