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
nv50_i2c_bus_drive_scl(struct nvkm_i2c_bus * base,int state)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
nv50_i2c_bus_drive_sda(struct nvkm_i2c_bus * base,int state)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
nv50_i2c_bus_sense_scl(struct nvkm_i2c_bus * base)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
nv50_i2c_bus_sense_sda(struct nvkm_i2c_bus * base)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
nv50_i2c_bus_init(struct nvkm_i2c_bus * base)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
nv50_i2c_bus_new(struct nvkm_i2c_pad * pad,int id,u8 drive,struct nvkm_i2c_bus ** pbus)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