1 /* $NetBSD: nouveau_nvkm_subdev_i2c_busnv4e.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_busnv4e.c,v 1.3 2021/12/18 23:45:40 riastradh Exp $");
28
29 #define nv4e_i2c_bus(p) container_of((p), struct nv4e_i2c_bus, base)
30 #include "bus.h"
31
32 struct nv4e_i2c_bus {
33 struct nvkm_i2c_bus base;
34 u32 addr;
35 };
36
37 static void
nv4e_i2c_bus_drive_scl(struct nvkm_i2c_bus * base,int state)38 nv4e_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
39 {
40 struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
41 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
42 nvkm_mask(device, bus->addr, 0x2f, state ? 0x21 : 0x01);
43 }
44
45 static void
nv4e_i2c_bus_drive_sda(struct nvkm_i2c_bus * base,int state)46 nv4e_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
47 {
48 struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
49 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
50 nvkm_mask(device, bus->addr, 0x1f, state ? 0x11 : 0x01);
51 }
52
53 static int
nv4e_i2c_bus_sense_scl(struct nvkm_i2c_bus * base)54 nv4e_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
55 {
56 struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
57 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
58 return !!(nvkm_rd32(device, bus->addr) & 0x00040000);
59 }
60
61 static int
nv4e_i2c_bus_sense_sda(struct nvkm_i2c_bus * base)62 nv4e_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
63 {
64 struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
65 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
66 return !!(nvkm_rd32(device, bus->addr) & 0x00080000);
67 }
68
69 static const struct nvkm_i2c_bus_func
70 nv4e_i2c_bus_func = {
71 .drive_scl = nv4e_i2c_bus_drive_scl,
72 .drive_sda = nv4e_i2c_bus_drive_sda,
73 .sense_scl = nv4e_i2c_bus_sense_scl,
74 .sense_sda = nv4e_i2c_bus_sense_sda,
75 .xfer = nvkm_i2c_bit_xfer,
76 };
77
78 int
nv4e_i2c_bus_new(struct nvkm_i2c_pad * pad,int id,u8 drive,struct nvkm_i2c_bus ** pbus)79 nv4e_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
80 struct nvkm_i2c_bus **pbus)
81 {
82 struct nv4e_i2c_bus *bus;
83
84 if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
85 return -ENOMEM;
86 *pbus = &bus->base;
87
88 nvkm_i2c_bus_ctor(&nv4e_i2c_bus_func, pad, id, &bus->base);
89 bus->addr = 0x600800 + drive;
90 return 0;
91 }
92