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
26void
27nv50_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
36void
37nv50_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
46int
47nv50_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
54int
55nv50_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
62static const struct nvkm_i2c_func
63nv50_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
70const u32 nv50_i2c_addr[] = {
71	0x00e138, 0x00e150, 0x00e168, 0x00e180,
72	0x00e254, 0x00e274, 0x00e764, 0x00e780,
73	0x00e79c, 0x00e7b8
74};
75const int nv50_i2c_addr_nr = ARRAY_SIZE(nv50_i2c_addr);
76
77static int
78nv50_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
100int
101nv50_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
109static struct nvkm_oclass
110nv50_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
122struct nvkm_oclass *
123nv50_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