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 nv50_i2c_bus(p) container_of((p), struct nv50_i2c_bus, base) 25 #include "bus.h" 26 27 #include <subdev/vga.h> 28 29 struct nv50_i2c_bus { 30 struct nvkm_i2c_bus base; 31 u32 addr; 32 u32 data; 33 }; 34 35 static void 36 nv50_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 45 static void 46 nv50_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 55 static int 56 nv50_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 63 static int 64 nv50_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 71 static void 72 nv50_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 79 static const struct nvkm_i2c_bus_func 80 nv50_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 89 int 90 nv50_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, 0x00e7b8 97 }; 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