1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2019 Axiado Corporation.
* All rights reserved.
*
* This software was developed in part by Philip Paeps under contract for
* Axiado Corporation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <dev/extres/clk/clk.h>
#include <dev/iicbus/iicbus.h>
#include <dev/iicbus/iiconf.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "iicbus_if.h"
#include "iicoc.h"
static struct ofw_compat_data compat_data[] = {
{ "opencores,i2c-ocores", 1 },
{ NULL, 0 }
};
static struct resource_spec iicoc_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
RESOURCE_SPEC_END
};
static phandle_t
iicoc_get_node(device_t bus, device_t dev)
{
/* Share controller node with iicbus device. */
return (ofw_bus_get_node(bus));
}
static int
iicoc_attach(device_t dev)
{
struct iicoc_softc *sc;
phandle_t node;
clk_t clock;
uint64_t clockfreq;
int error;
sc = device_get_softc(dev);
sc->dev = dev;
mtx_init(&sc->sc_mtx, "iicoc", "iicoc", MTX_DEF);
error = bus_alloc_resources(dev, iicoc_spec, &sc->mem_res);
if (error) {
device_printf(dev, "Could not allocate bus resource.\n");
goto fail;
}
node = ofw_bus_get_node(dev);
sc->reg_shift = 0;
OF_getencprop(node, "reg-shift", &sc->reg_shift,
sizeof(sc->reg_shift));
error = clk_get_by_ofw_index(dev, 0, 0, &clock);
if (error) {
device_printf(dev, "Couldn't get clock\n");
goto fail;
}
error = clk_enable(clock);
if (error) {
device_printf(dev, "Couldn't enable clock\n");
goto fail1;
}
error = clk_get_freq(clock, &clockfreq);
if (error) {
device_printf(dev, "Couldn't get clock frequency\n");
goto fail1;
}
if (clockfreq > UINT_MAX) {
device_printf(dev, "Unsupported clock frequency\n");
goto fail1;
}
sc->clockfreq = (u_int)clockfreq;
sc->i2cfreq = XLP_I2C_FREQ;
iicoc_init(dev);
sc->iicbus = device_add_child(dev, "iicbus", -1);
if (sc->iicbus == NULL) {
device_printf(dev, "Could not allocate iicbus instance.\n");
error = ENXIO;
goto fail1;
}
/* Probe and attach the iicbus when interrupts are available. */
config_intrhook_oneshot((ich_func_t)bus_generic_attach, dev);
return (0);
fail1:
clk_disable(clock);
fail:
bus_release_resources(dev, iicoc_spec, &sc->mem_res);
mtx_destroy(&sc->sc_mtx);
return (error);
}
static int
iicoc_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
return (ENXIO);
device_set_desc(dev, "OpenCores I2C master controller");
return (BUS_PROBE_DEFAULT);
}
static device_method_t iicoc_methods[] = {
/* device interface */
DEVMETHOD(device_probe, iicoc_probe),
DEVMETHOD(device_attach, iicoc_attach),
/* ofw interface */
DEVMETHOD(ofw_bus_get_node, iicoc_get_node),
/* iicbus interface */
DEVMETHOD(iicbus_callback, iicbus_null_callback),
DEVMETHOD(iicbus_repeated_start, iicoc_iicbus_repeated_start),
DEVMETHOD(iicbus_start, iicoc_iicbus_start),
DEVMETHOD(iicbus_stop, iicoc_iicbus_stop),
DEVMETHOD(iicbus_reset, iicoc_iicbus_reset),
DEVMETHOD(iicbus_write, iicoc_iicbus_write),
DEVMETHOD(iicbus_read, iicoc_iicbus_read),
DEVMETHOD(iicbus_transfer, iicbus_transfer_gen),
DEVMETHOD_END
};
static driver_t iicoc_driver = {
"iicoc",
iicoc_methods,
sizeof(struct iicoc_softc),
};
DRIVER_MODULE(iicoc, simplebus, iicoc_driver, iicoc_devclass, 0, 0);
DRIVER_MODULE(ofw_iicbus, iicoc, ofw_iicbus_driver, ofw_iicbus_devclass, 0, 0);
MODULE_DEPEND(iicoc, iicbus, 1, 1, 1);
MODULE_DEPEND(iicoc, ofw_iicbus, 1, 1, 1);
|
