2 * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/limits.h>
36 #include <sys/module.h>
37 #include <sys/mutex.h>
38 #include <sys/resource.h>
40 #include <sys/sysctl.h>
42 #include <machine/bus.h>
44 #include <dev/ofw/openfirm.h>
45 #include <dev/ofw/ofw_bus.h>
46 #include <dev/ofw/ofw_bus_subr.h>
48 #include "am335x_pwm.h"
50 #define ECAP_TSCTR 0x00
51 #define ECAP_CAP1 0x08
52 #define ECAP_CAP2 0x0C
53 #define ECAP_CAP3 0x10
54 #define ECAP_CAP4 0x14
55 #define ECAP_ECCTL2 0x2A
56 #define ECCTL2_MODE_APWM (1 << 9)
57 #define ECCTL2_SYNCO_SEL (3 << 6)
58 #define ECCTL2_TSCTRSTOP_FREERUN (1 << 4)
60 #define ECAP_READ2(_sc, reg) bus_read_2((_sc)->sc_mem_res, reg);
61 #define ECAP_WRITE2(_sc, reg, value) \
62 bus_write_2((_sc)->sc_mem_res, reg, value);
63 #define ECAP_READ4(_sc, reg) bus_read_4((_sc)->sc_mem_res, reg);
64 #define ECAP_WRITE4(_sc, reg, value) \
65 bus_write_4((_sc)->sc_mem_res, reg, value);
67 #define PWM_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
68 #define PWM_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
69 #define PWM_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \
70 device_get_nameunit(_sc->sc_dev), "am335x_ecap softc", MTX_DEF)
71 #define PWM_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx)
73 static device_probe_t am335x_ecap_probe;
74 static device_attach_t am335x_ecap_attach;
75 static device_detach_t am335x_ecap_detach;
77 struct am335x_ecap_softc {
80 struct resource *sc_mem_res;
84 static device_method_t am335x_ecap_methods[] = {
85 DEVMETHOD(device_probe, am335x_ecap_probe),
86 DEVMETHOD(device_attach, am335x_ecap_attach),
87 DEVMETHOD(device_detach, am335x_ecap_detach),
92 static driver_t am335x_ecap_driver = {
95 sizeof(struct am335x_ecap_softc),
98 static devclass_t am335x_ecap_devclass;
101 * API function to set period/duty cycles for ECAPx
104 am335x_pwm_config_ecap(int unit, int period, int duty)
107 struct am335x_ecap_softc *sc;
110 dev = devclass_get_device(am335x_ecap_devclass, unit);
120 sc = device_get_softc(dev);
123 reg = ECAP_READ2(sc, ECAP_ECCTL2);
124 reg |= ECCTL2_MODE_APWM | ECCTL2_TSCTRSTOP_FREERUN | ECCTL2_SYNCO_SEL;
125 ECAP_WRITE2(sc, ECAP_ECCTL2, reg);
127 /* CAP3 in APWM mode is APRD shadow register */
128 ECAP_WRITE4(sc, ECAP_CAP3, period - 1);
130 /* CAP4 in APWM mode is ACMP shadow register */
131 ECAP_WRITE4(sc, ECAP_CAP4, duty);
132 /* Restart counter */
133 ECAP_WRITE4(sc, ECAP_TSCTR, 0);
141 am335x_ecap_probe(device_t dev)
144 if (!ofw_bus_status_okay(dev))
147 if (!ofw_bus_is_compatible(dev, "ti,am33xx-ecap"))
150 device_set_desc(dev, "AM335x eCAP");
152 return (BUS_PROBE_DEFAULT);
156 am335x_ecap_attach(device_t dev)
158 struct am335x_ecap_softc *sc;
160 sc = device_get_softc(dev);
165 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
166 &sc->sc_mem_rid, RF_ACTIVE);
167 if (sc->sc_mem_res == NULL) {
168 device_printf(dev, "cannot allocate memory resources\n");
175 PWM_LOCK_DESTROY(sc);
180 am335x_ecap_detach(device_t dev)
182 struct am335x_ecap_softc *sc;
184 sc = device_get_softc(dev);
188 bus_release_resource(dev, SYS_RES_MEMORY,
189 sc->sc_mem_rid, sc->sc_mem_res);
192 PWM_LOCK_DESTROY(sc);
198 DRIVER_MODULE(am335x_ecap, am335x_pwmss, am335x_ecap_driver, am335x_ecap_devclass, 0, 0);
199 MODULE_VERSION(am335x_ecap, 1);
200 MODULE_DEPEND(am335x_ecap, am335x_pwmss, 1, 1, 1);