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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 nv50_i2c_bus(p) container_of((p), struct nv50_i2c_bus, base)25#include "bus.h"26 27#include <subdev/vga.h>28 29struct nv50_i2c_bus {30 struct nvkm_i2c_bus base;31 u32 addr;32 u32 data;33};34 35static void36nv50_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)37{38 struct nv50_i2c_bus *bus = nv50_i2c_bus(base);39 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;40 if (state) bus->data |= 0x01;41 else bus->data &= 0xfe;42 nvkm_wr32(device, bus->addr, bus->data);43}44 45static void46nv50_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)47{48 struct nv50_i2c_bus *bus = nv50_i2c_bus(base);49 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;50 if (state) bus->data |= 0x02;51 else bus->data &= 0xfd;52 nvkm_wr32(device, bus->addr, bus->data);53}54 55static int56nv50_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)57{58 struct nv50_i2c_bus *bus = nv50_i2c_bus(base);59 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;60 return !!(nvkm_rd32(device, bus->addr) & 0x00000001);61}62 63static int64nv50_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)65{66 struct nv50_i2c_bus *bus = nv50_i2c_bus(base);67 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;68 return !!(nvkm_rd32(device, bus->addr) & 0x00000002);69}70 71static void72nv50_i2c_bus_init(struct nvkm_i2c_bus *base)73{74 struct nv50_i2c_bus *bus = nv50_i2c_bus(base);75 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;76 nvkm_wr32(device, bus->addr, (bus->data = 0x00000007));77}78 79static const struct nvkm_i2c_bus_func80nv50_i2c_bus_func = {81 .init = nv50_i2c_bus_init,82 .drive_scl = nv50_i2c_bus_drive_scl,83 .drive_sda = nv50_i2c_bus_drive_sda,84 .sense_scl = nv50_i2c_bus_sense_scl,85 .sense_sda = nv50_i2c_bus_sense_sda,86 .xfer = nvkm_i2c_bit_xfer,87};88 89int90nv50_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,91 struct nvkm_i2c_bus **pbus)92{93 static const u32 addr[] = {94 0x00e138, 0x00e150, 0x00e168, 0x00e180,95 0x00e254, 0x00e274, 0x00e764, 0x00e780,96 0x00e79c, 0x00e7b897 };98 struct nv50_i2c_bus *bus;99 100 if (drive >= ARRAY_SIZE(addr)) {101 nvkm_warn(&pad->i2c->subdev, "bus %d unknown\n", drive);102 return -ENODEV;103 }104 105 if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))106 return -ENOMEM;107 *pbus = &bus->base;108 109 nvkm_i2c_bus_ctor(&nv50_i2c_bus_func, pad, id, &bus->base);110 bus->addr = addr[drive];111 bus->data = 0x00000007;112 return 0;113}114