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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
#include <machine/rtems-bsd-kernel-space.h>
/*-
* Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
* All rights reserved.
*
* 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 AUTHOR 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 AUTHOR 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/bus.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <rtems/bsd/sys/resource.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <machine/bus.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "am335x_pwm.h"
#define ECAP_TSCTR 0x00
#define ECAP_CAP1 0x08
#define ECAP_CAP2 0x0C
#define ECAP_CAP3 0x10
#define ECAP_CAP4 0x14
#define ECAP_ECCTL2 0x2A
#define ECCTL2_MODE_APWM (1 << 9)
#define ECCTL2_SYNCO_SEL (3 << 6)
#define ECCTL2_TSCTRSTOP_FREERUN (1 << 4)
#define ECAP_READ2(_sc, reg) bus_read_2((_sc)->sc_mem_res, reg);
#define ECAP_WRITE2(_sc, reg, value) \
bus_write_2((_sc)->sc_mem_res, reg, value);
#define ECAP_READ4(_sc, reg) bus_read_4((_sc)->sc_mem_res, reg);
#define ECAP_WRITE4(_sc, reg, value) \
bus_write_4((_sc)->sc_mem_res, reg, value);
#define PWM_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
#define PWM_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
#define PWM_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \
device_get_nameunit(_sc->sc_dev), "am335x_ecap softc", MTX_DEF)
#define PWM_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx)
static device_probe_t am335x_ecap_probe;
static device_attach_t am335x_ecap_attach;
static device_detach_t am335x_ecap_detach;
struct am335x_ecap_softc {
device_t sc_dev;
struct mtx sc_mtx;
struct resource *sc_mem_res;
int sc_mem_rid;
};
static device_method_t am335x_ecap_methods[] = {
DEVMETHOD(device_probe, am335x_ecap_probe),
DEVMETHOD(device_attach, am335x_ecap_attach),
DEVMETHOD(device_detach, am335x_ecap_detach),
DEVMETHOD_END
};
static driver_t am335x_ecap_driver = {
"am335x_ecap",
am335x_ecap_methods,
sizeof(struct am335x_ecap_softc),
};
static devclass_t am335x_ecap_devclass;
/*
* API function to set period/duty cycles for ECAPx
*/
int
am335x_pwm_config_ecap(int unit, int period, int duty)
{
device_t dev;
struct am335x_ecap_softc *sc;
uint16_t reg;
dev = devclass_get_device(am335x_ecap_devclass, unit);
if (dev == NULL)
return (ENXIO);
if (duty > period)
return (EINVAL);
if (period == 0)
return (EINVAL);
sc = device_get_softc(dev);
PWM_LOCK(sc);
reg = ECAP_READ2(sc, ECAP_ECCTL2);
reg |= ECCTL2_MODE_APWM | ECCTL2_TSCTRSTOP_FREERUN | ECCTL2_SYNCO_SEL;
ECAP_WRITE2(sc, ECAP_ECCTL2, reg);
/* CAP3 in APWM mode is APRD shadow register */
ECAP_WRITE4(sc, ECAP_CAP3, period - 1);
/* CAP4 in APWM mode is ACMP shadow register */
ECAP_WRITE4(sc, ECAP_CAP4, duty);
/* Restart counter */
ECAP_WRITE4(sc, ECAP_TSCTR, 0);
PWM_UNLOCK(sc);
return (0);
}
static int
am335x_ecap_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "ti,am33xx-ecap"))
return (ENXIO);
device_set_desc(dev, "AM335x eCAP");
return (BUS_PROBE_DEFAULT);
}
static int
am335x_ecap_attach(device_t dev)
{
struct am335x_ecap_softc *sc;
sc = device_get_softc(dev);
sc->sc_dev = dev;
PWM_LOCK_INIT(sc);
sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
&sc->sc_mem_rid, RF_ACTIVE);
if (sc->sc_mem_res == NULL) {
device_printf(dev, "cannot allocate memory resources\n");
goto fail;
}
return (0);
fail:
PWM_LOCK_DESTROY(sc);
return (ENXIO);
}
static int
am335x_ecap_detach(device_t dev)
{
struct am335x_ecap_softc *sc;
sc = device_get_softc(dev);
PWM_LOCK(sc);
if (sc->sc_mem_res)
bus_release_resource(dev, SYS_RES_MEMORY,
sc->sc_mem_rid, sc->sc_mem_res);
PWM_UNLOCK(sc);
PWM_LOCK_DESTROY(sc);
return (0);
}
DRIVER_MODULE(am335x_ecap, am335x_pwmss, am335x_ecap_driver, am335x_ecap_devclass, 0, 0);
MODULE_VERSION(am335x_ecap, 1);
MODULE_DEPEND(am335x_ecap, am335x_pwmss, 1, 1, 1);
|
