1 /*
2 * Copyright 2012 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 portions 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
23 */
24 #include "nv50.h"
25
26 void
nv50_i2c_drive_scl(struct nvkm_i2c_port * base,int state)27 nv50_i2c_drive_scl(struct nvkm_i2c_port *base, int state)
28 {
29 struct nv50_i2c_priv *priv = (void *)nvkm_i2c(base);
30 struct nv50_i2c_port *port = (void *)base;
31 if (state) port->state |= 0x01;
32 else port->state &= 0xfe;
33 nv_wr32(priv, port->addr, port->state);
34 }
35
36 void
nv50_i2c_drive_sda(struct nvkm_i2c_port * base,int state)37 nv50_i2c_drive_sda(struct nvkm_i2c_port *base, int state)
38 {
39 struct nv50_i2c_priv *priv = (void *)nvkm_i2c(base);
40 struct nv50_i2c_port *port = (void *)base;
41 if (state) port->state |= 0x02;
42 else port->state &= 0xfd;
43 nv_wr32(priv, port->addr, port->state);
44 }
45
46 int
nv50_i2c_sense_scl(struct nvkm_i2c_port * base)47 nv50_i2c_sense_scl(struct nvkm_i2c_port *base)
48 {
49 struct nv50_i2c_priv *priv = (void *)nvkm_i2c(base);
50 struct nv50_i2c_port *port = (void *)base;
51 return !!(nv_rd32(priv, port->addr) & 0x00000001);
52 }
53
54 int
nv50_i2c_sense_sda(struct nvkm_i2c_port * base)55 nv50_i2c_sense_sda(struct nvkm_i2c_port *base)
56 {
57 struct nv50_i2c_priv *priv = (void *)nvkm_i2c(base);
58 struct nv50_i2c_port *port = (void *)base;
59 return !!(nv_rd32(priv, port->addr) & 0x00000002);
60 }
61
62 static const struct nvkm_i2c_func
63 nv50_i2c_func = {
64 .drive_scl = nv50_i2c_drive_scl,
65 .drive_sda = nv50_i2c_drive_sda,
66 .sense_scl = nv50_i2c_sense_scl,
67 .sense_sda = nv50_i2c_sense_sda,
68 };
69
70 const u32 nv50_i2c_addr[] = {
71 0x00e138, 0x00e150, 0x00e168, 0x00e180,
72 0x00e254, 0x00e274, 0x00e764, 0x00e780,
73 0x00e79c, 0x00e7b8
74 };
75 const int nv50_i2c_addr_nr = ARRAY_SIZE(nv50_i2c_addr);
76
77 static int
nv50_i2c_port_ctor(struct nvkm_object * parent,struct nvkm_object * engine,struct nvkm_oclass * oclass,void * data,u32 index,struct nvkm_object ** pobject)78 nv50_i2c_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
79 struct nvkm_oclass *oclass, void *data, u32 index,
80 struct nvkm_object **pobject)
81 {
82 struct dcb_i2c_entry *info = data;
83 struct nv50_i2c_port *port;
84 int ret;
85
86 ret = nvkm_i2c_port_create(parent, engine, oclass, index,
87 &nvkm_i2c_bit_algo, &nv50_i2c_func, &port);
88 *pobject = nv_object(port);
89 if (ret)
90 return ret;
91
92 if (info->drive >= nv50_i2c_addr_nr)
93 return -EINVAL;
94
95 port->state = 0x00000007;
96 port->addr = nv50_i2c_addr[info->drive];
97 return 0;
98 }
99
100 int
nv50_i2c_port_init(struct nvkm_object * object)101 nv50_i2c_port_init(struct nvkm_object *object)
102 {
103 struct nv50_i2c_priv *priv = (void *)nvkm_i2c(object);
104 struct nv50_i2c_port *port = (void *)object;
105 nv_wr32(priv, port->addr, port->state);
106 return nvkm_i2c_port_init(&port->base);
107 }
108
109 static struct nvkm_oclass
110 nv50_i2c_sclass[] = {
111 { .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_BIT),
112 .ofuncs = &(struct nvkm_ofuncs) {
113 .ctor = nv50_i2c_port_ctor,
114 .dtor = _nvkm_i2c_port_dtor,
115 .init = nv50_i2c_port_init,
116 .fini = _nvkm_i2c_port_fini,
117 },
118 },
119 {}
120 };
121
122 struct nvkm_oclass *
123 nv50_i2c_oclass = &(struct nvkm_i2c_impl) {
124 .base.handle = NV_SUBDEV(I2C, 0x50),
125 .base.ofuncs = &(struct nvkm_ofuncs) {
126 .ctor = _nvkm_i2c_ctor,
127 .dtor = _nvkm_i2c_dtor,
128 .init = _nvkm_i2c_init,
129 .fini = _nvkm_i2c_fini,
130 },
131 .sclass = nv50_i2c_sclass,
132 .pad_x = &nv04_i2c_pad_oclass,
133 }.base;
134