kernel/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/nv04.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 #include <subdev/vga.h>
  27
  28 struct nv04_i2c_priv {
  29         struct nvkm_i2c base;
  30 };
  31
  32 struct nv04_i2c_port {
  33         struct nvkm_i2c_port base;
  34         u8 drive;
  35         u8 sense;
  36 };
  37
  38 static void
  39 nv04_i2c_drive_scl(struct nvkm_i2c_port *base, int state)
  40 {
  41         struct nv04_i2c_priv *priv = (void *)nvkm_i2c(base);
  42         struct nv04_i2c_port *port = (void *)base;
  43         u8 val = nv_rdvgac(priv, 0, port->drive);
  44         if (state) val |= 0x20;
  45         else       val &= 0xdf;
  46         nv_wrvgac(priv, 0, port->drive, val | 0x01);
  47 }
  48
  49 static void
  50 nv04_i2c_drive_sda(struct nvkm_i2c_port *base, int state)
  51 {
  52         struct nv04_i2c_priv *priv = (void *)nvkm_i2c(base);
  53         struct nv04_i2c_port *port = (void *)base;
  54         u8 val = nv_rdvgac(priv, 0, port->drive);
  55         if (state) val |= 0x10;
  56         else       val &= 0xef;
  57         nv_wrvgac(priv, 0, port->drive, val | 0x01);
  58 }
  59
  60 static int
  61 nv04_i2c_sense_scl(struct nvkm_i2c_port *base)
  62 {
  63         struct nv04_i2c_priv *priv = (void *)nvkm_i2c(base);
  64         struct nv04_i2c_port *port = (void *)base;
  65         return !!(nv_rdvgac(priv, 0, port->sense) & 0x04);
  66 }
  67
  68 static int
  69 nv04_i2c_sense_sda(struct nvkm_i2c_port *base)
  70 {
  71         struct nv04_i2c_priv *priv = (void *)nvkm_i2c(base);
  72         struct nv04_i2c_port *port = (void *)base;
  73         return !!(nv_rdvgac(priv, 0, port->sense) & 0x08);
  74 }
  75
  76 static const struct nvkm_i2c_func
  77 nv04_i2c_func = {
  78         .drive_scl = nv04_i2c_drive_scl,
  79         .drive_sda = nv04_i2c_drive_sda,
  80         .sense_scl = nv04_i2c_sense_scl,
  81         .sense_sda = nv04_i2c_sense_sda,
  82 };
  83
  84 static int
  85 nv04_i2c_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
  86                    struct nvkm_oclass *oclass, void *data, u32 index,
  87                    struct nvkm_object **pobject)
  88 {
  89         struct dcb_i2c_entry *info = data;
  90         struct nv04_i2c_port *port;
  91         int ret;
  92
  93         ret = nvkm_i2c_port_create(parent, engine, oclass, index,
  94                                    &nvkm_i2c_bit_algo, &nv04_i2c_func, &port);
  95         *pobject = nv_object(port);
  96         if (ret)
  97                 return ret;
  98
  99         port->drive = info->drive;
 100         port->sense = info->sense;
 101         return 0;
 102 }
 103
 104 static struct nvkm_oclass
 105 nv04_i2c_sclass[] = {
 106         { .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NV04_BIT),
 107           .ofuncs = &(struct nvkm_ofuncs) {
 108                   .ctor = nv04_i2c_port_ctor,
 109                   .dtor = _nvkm_i2c_port_dtor,
 110                   .init = _nvkm_i2c_port_init,
 111                   .fini = _nvkm_i2c_port_fini,
 112           },
 113         },
 114         {}
 115 };
 116
 117 struct nvkm_oclass *
 118 nv04_i2c_oclass = &(struct nvkm_i2c_impl) {
 119         .base.handle = NV_SUBDEV(I2C, 0x04),
 120         .base.ofuncs = &(struct nvkm_ofuncs) {
 121                 .ctor = _nvkm_i2c_ctor,
 122                 .dtor = _nvkm_i2c_dtor,
 123                 .init = _nvkm_i2c_init,
 124                 .fini = _nvkm_i2c_fini,
 125         },
 126         .sclass = nv04_i2c_sclass,
 127         .pad_x = &nv04_i2c_pad_oclass,
 128 }.base;