1 /* $NetBSD: nouveau_nvkm_subdev_i2c_busnv50.c,v 1.3 2021/12/18 23:45:40 riastradh Exp $ */
2
3 /*
4 * Copyright 2015 Red Hat Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial busions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Ben Skeggs <bskeggs@redhat.com>
25 */
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_i2c_busnv50.c,v 1.3 2021/12/18 23:45:40 riastradh Exp $");
28
29 #define nv50_i2c_bus(p) container_of((p), struct nv50_i2c_bus, base)
30 #include "bus.h"
31
32 #include <subdev/vga.h>
33
34 struct nv50_i2c_bus {
35 struct nvkm_i2c_bus base;
36 u32 addr;
37 u32 data;
38 };
39
40 static void
nv50_i2c_bus_drive_scl(struct nvkm_i2c_bus * base,int state)41 nv50_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
42 {
43 struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
44 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
45 if (state) bus->data |= 0x01;
46 else bus->data &= 0xfe;
47 nvkm_wr32(device, bus->addr, bus->data);
48 }
49
50 static void
nv50_i2c_bus_drive_sda(struct nvkm_i2c_bus * base,int state)51 nv50_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
52 {
53 struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
54 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
55 if (state) bus->data |= 0x02;
56 else bus->data &= 0xfd;
57 nvkm_wr32(device, bus->addr, bus->data);
58 }
59
60 static int
nv50_i2c_bus_sense_scl(struct nvkm_i2c_bus * base)61 nv50_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
62 {
63 struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
64 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
65 return !!(nvkm_rd32(device, bus->addr) & 0x00000001);
66 }
67
68 static int
nv50_i2c_bus_sense_sda(struct nvkm_i2c_bus * base)69 nv50_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
70 {
71 struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
72 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
73 return !!(nvkm_rd32(device, bus->addr) & 0x00000002);
74 }
75
76 static void
nv50_i2c_bus_init(struct nvkm_i2c_bus * base)77 nv50_i2c_bus_init(struct nvkm_i2c_bus *base)
78 {
79 struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
80 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
81 nvkm_wr32(device, bus->addr, (bus->data = 0x00000007));
82 }
83
84 static const struct nvkm_i2c_bus_func
85 nv50_i2c_bus_func = {
86 .init = nv50_i2c_bus_init,
87 .drive_scl = nv50_i2c_bus_drive_scl,
88 .drive_sda = nv50_i2c_bus_drive_sda,
89 .sense_scl = nv50_i2c_bus_sense_scl,
90 .sense_sda = nv50_i2c_bus_sense_sda,
91 .xfer = nvkm_i2c_bit_xfer,
92 };
93
94 int
nv50_i2c_bus_new(struct nvkm_i2c_pad * pad,int id,u8 drive,struct nvkm_i2c_bus ** pbus)95 nv50_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
96 struct nvkm_i2c_bus **pbus)
97 {
98 static const u32 addr[] = {
99 0x00e138, 0x00e150, 0x00e168, 0x00e180,
100 0x00e254, 0x00e274, 0x00e764, 0x00e780,
101 0x00e79c, 0x00e7b8
102 };
103 struct nv50_i2c_bus *bus;
104
105 if (drive >= ARRAY_SIZE(addr)) {
106 nvkm_warn(&pad->i2c->subdev, "bus %d unknown\n", drive);
107 return -ENODEV;
108 }
109
110 if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
111 return -ENOMEM;
112 *pbus = &bus->base;
113
114 nvkm_i2c_bus_ctor(&nv50_i2c_bus_func, pad, id, &bus->base);
115 bus->addr = addr[drive];
116 bus->data = 0x00000007;
117 return 0;
118 }
119