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1/*2 * Copyright 2015 Red Hat Inc.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial busions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * 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 OR20 * 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 void33gf119_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 void41gf119_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 int49gf119_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 int57gf119_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 void65gf119_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_func73gf119_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 82int83gf119_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