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 nv4e_i2c_bus(p) container_of((p), struct nv4e_i2c_bus, base) 25 #include "bus.h" 26 27 struct nv4e_i2c_bus { 28 struct nvkm_i2c_bus base; 29 u32 addr; 30 }; 31 32 static void 33 nv4e_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 40 static void 41 nv4e_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 48 static int 49 nv4e_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 56 static int 57 nv4e_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 64 static const struct nvkm_i2c_bus_func 65 nv4e_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 73 int 74 nv4e_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