1 /* $NetBSD: nouveau_nvkm_subdev_i2c_busgf119.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_busgf119.c,v 1.3 2021/12/18 23:45:40 riastradh Exp $");
28
29 #define gf119_i2c_bus(p) container_of((p), struct gf119_i2c_bus, base)
30 #include "bus.h"
31
32 struct gf119_i2c_bus {
33 struct nvkm_i2c_bus base;
34 u32 addr;
35 };
36
37 static void
gf119_i2c_bus_drive_scl(struct nvkm_i2c_bus * base,int state)38 gf119_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
39 {
40 struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
41 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
42 nvkm_mask(device, bus->addr, 0x00000001, state ? 0x00000001 : 0);
43 }
44
45 static void
gf119_i2c_bus_drive_sda(struct nvkm_i2c_bus * base,int state)46 gf119_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
47 {
48 struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
49 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
50 nvkm_mask(device, bus->addr, 0x00000002, state ? 0x00000002 : 0);
51 }
52
53 static int
gf119_i2c_bus_sense_scl(struct nvkm_i2c_bus * base)54 gf119_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
55 {
56 struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
57 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
58 return !!(nvkm_rd32(device, bus->addr) & 0x00000010);
59 }
60
61 static int
gf119_i2c_bus_sense_sda(struct nvkm_i2c_bus * base)62 gf119_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
63 {
64 struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
65 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
66 return !!(nvkm_rd32(device, bus->addr) & 0x00000020);
67 }
68
69 static void
gf119_i2c_bus_init(struct nvkm_i2c_bus * base)70 gf119_i2c_bus_init(struct nvkm_i2c_bus *base)
71 {
72 struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
73 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
74 nvkm_wr32(device, bus->addr, 0x00000007);
75 }
76
77 static const struct nvkm_i2c_bus_func
78 gf119_i2c_bus_func = {
79 .init = gf119_i2c_bus_init,
80 .drive_scl = gf119_i2c_bus_drive_scl,
81 .drive_sda = gf119_i2c_bus_drive_sda,
82 .sense_scl = gf119_i2c_bus_sense_scl,
83 .sense_sda = gf119_i2c_bus_sense_sda,
84 .xfer = nvkm_i2c_bit_xfer,
85 };
86
87 int
gf119_i2c_bus_new(struct nvkm_i2c_pad * pad,int id,u8 drive,struct nvkm_i2c_bus ** pbus)88 gf119_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
89 struct nvkm_i2c_bus **pbus)
90 {
91 struct gf119_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(&gf119_i2c_bus_func, pad, id, &bus->base);
98 bus->addr = 0x00d014 + (drive * 0x20);
99 return 0;
100 }
101