LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busgf119.c

   1/*
   2 * Copyright 2015 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 busions 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 <bskeggs@redhat.com>
  23 */
  24#define gf119_i2c_bus(p) container_of((p), struct gf119_i2c_bus, base)
  25#include "bus.h"
  26
  27struct gf119_i2c_bus {
  28        struct nvkm_i2c_bus base;
  29        u32 addr;
  30};
  31
  32static void
  33gf119_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
  34{
  35        struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
  36        struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
  37        nvkm_mask(device, bus->addr, 0x00000001, state ? 0x00000001 : 0);
  38}
  39
  40static void
  41gf119_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
  42{
  43        struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
  44        struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
  45        nvkm_mask(device, bus->addr, 0x00000002, state ? 0x00000002 : 0);
  46}
  47
  48static int
  49gf119_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
  50{
  51        struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
  52        struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
  53        return !!(nvkm_rd32(device, bus->addr) & 0x00000010);
  54}
  55
  56static int
  57gf119_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
  58{
  59        struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
  60        struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
  61        return !!(nvkm_rd32(device, bus->addr) & 0x00000020);
  62}
  63
  64static void
  65gf119_i2c_bus_init(struct nvkm_i2c_bus *base)
  66{
  67        struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
  68        struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
  69        nvkm_wr32(device, bus->addr, 0x00000007);
  70}
  71
  72static const struct nvkm_i2c_bus_func
  73gf119_i2c_bus_func = {
  74        .init = gf119_i2c_bus_init,
  75        .drive_scl = gf119_i2c_bus_drive_scl,
  76        .drive_sda = gf119_i2c_bus_drive_sda,
  77        .sense_scl = gf119_i2c_bus_sense_scl,
  78        .sense_sda = gf119_i2c_bus_sense_sda,
  79        .xfer = nvkm_i2c_bit_xfer,
  80};
  81
  82int
  83gf119_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
  84                 struct nvkm_i2c_bus **pbus)
  85{
  86        struct gf119_i2c_bus *bus;
  87
  88        if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
  89                return -ENOMEM;
  90        *pbus = &bus->base;
  91
  92        nvkm_i2c_bus_ctor(&gf119_i2c_bus_func, pad, id, &bus->base);
  93        bus->addr = 0x00d014 + (drive * 0x20);
  94        return 0;
  95}
  96