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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 nv4e_i2c_bus(p) container_of((p), struct nv4e_i2c_bus, base)25#include "bus.h"26 27struct nv4e_i2c_bus {28 struct nvkm_i2c_bus base;29 u32 addr;30};31 32static void33nv4e_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)34{35 struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);36 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;37 nvkm_mask(device, bus->addr, 0x2f, state ? 0x21 : 0x01);38}39 40static void41nv4e_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)42{43 struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);44 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;45 nvkm_mask(device, bus->addr, 0x1f, state ? 0x11 : 0x01);46}47 48static int49nv4e_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)50{51 struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);52 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;53 return !!(nvkm_rd32(device, bus->addr) & 0x00040000);54}55 56static int57nv4e_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)58{59 struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);60 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;61 return !!(nvkm_rd32(device, bus->addr) & 0x00080000);62}63 64static const struct nvkm_i2c_bus_func65nv4e_i2c_bus_func = {66 .drive_scl = nv4e_i2c_bus_drive_scl,67 .drive_sda = nv4e_i2c_bus_drive_sda,68 .sense_scl = nv4e_i2c_bus_sense_scl,69 .sense_sda = nv4e_i2c_bus_sense_sda,70 .xfer = nvkm_i2c_bit_xfer,71};72 73int74nv4e_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,75 struct nvkm_i2c_bus **pbus)76{77 struct nv4e_i2c_bus *bus;78 79 if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))80 return -ENOMEM;81 *pbus = &bus->base;82 83 nvkm_i2c_bus_ctor(&nv4e_i2c_bus_func, pad, id, &bus->base);84 bus->addr = 0x600800 + drive;85 return 0;86}87