1 /* $NetBSD: nouveau_nvkm_subdev_i2c_busnv04.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_busnv04.c,v 1.3 2021/12/18 23:45:40 riastradh Exp $");
28
29 #define nv04_i2c_bus(p) container_of((p), struct nv04_i2c_bus, base)
30 #include "bus.h"
31
32 #include <subdev/vga.h>
33
34 struct nv04_i2c_bus {
35 struct nvkm_i2c_bus base;
36 u8 drive;
37 u8 sense;
38 };
39
40 static void
nv04_i2c_bus_drive_scl(struct nvkm_i2c_bus * base,int state)41 nv04_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
42 {
43 struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
44 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
45 u8 val = nvkm_rdvgac(device, 0, bus->drive);
46 if (state) val |= 0x20;
47 else val &= 0xdf;
48 nvkm_wrvgac(device, 0, bus->drive, val | 0x01);
49 }
50
51 static void
nv04_i2c_bus_drive_sda(struct nvkm_i2c_bus * base,int state)52 nv04_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
53 {
54 struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
55 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
56 u8 val = nvkm_rdvgac(device, 0, bus->drive);
57 if (state) val |= 0x10;
58 else val &= 0xef;
59 nvkm_wrvgac(device, 0, bus->drive, val | 0x01);
60 }
61
62 static int
nv04_i2c_bus_sense_scl(struct nvkm_i2c_bus * base)63 nv04_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
64 {
65 struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
66 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
67 return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x04);
68 }
69
70 static int
nv04_i2c_bus_sense_sda(struct nvkm_i2c_bus * base)71 nv04_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
72 {
73 struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
74 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
75 return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x08);
76 }
77
78 static const struct nvkm_i2c_bus_func
79 nv04_i2c_bus_func = {
80 .drive_scl = nv04_i2c_bus_drive_scl,
81 .drive_sda = nv04_i2c_bus_drive_sda,
82 .sense_scl = nv04_i2c_bus_sense_scl,
83 .sense_sda = nv04_i2c_bus_sense_sda,
84 .xfer = nvkm_i2c_bit_xfer,
85 };
86
87 int
nv04_i2c_bus_new(struct nvkm_i2c_pad * pad,int id,u8 drive,u8 sense,struct nvkm_i2c_bus ** pbus)88 nv04_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive, u8 sense,
89 struct nvkm_i2c_bus **pbus)
90 {
91 struct nv04_i2c_bus *bus;
92
93 if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
94 return -ENOMEM;
95 *pbus = &bus->base;
96
97 nvkm_i2c_bus_ctor(&nv04_i2c_bus_func, pad, id, &bus->base);
98 bus->drive = drive;
99 bus->sense = sense;
100 return 0;
101 }
102