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 gf119_i2c_bus(p) container_of((p), struct gf119_i2c_bus, base)
25 #include "bus.h"
26
27 struct gf119_i2c_bus {
28 struct nvkm_i2c_bus base;
29 u32 addr;
30 };
31
32 static void
gf119_i2c_bus_drive_scl(struct nvkm_i2c_bus * base,int state)33 gf119_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
40 static void
gf119_i2c_bus_drive_sda(struct nvkm_i2c_bus * base,int state)41 gf119_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
48 static int
gf119_i2c_bus_sense_scl(struct nvkm_i2c_bus * base)49 gf119_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
56 static int
gf119_i2c_bus_sense_sda(struct nvkm_i2c_bus * base)57 gf119_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
64 static void
gf119_i2c_bus_init(struct nvkm_i2c_bus * base)65 gf119_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
72 static const struct nvkm_i2c_bus_func
73 gf119_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
82 int
gf119_i2c_bus_new(struct nvkm_i2c_pad * pad,int id,u8 drive,struct nvkm_i2c_bus ** pbus)83 gf119_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