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/fdt/simplebus.h>
45 #include <dev/ofw/openfirm.h>
46 #include <dev/ofw/ofw_bus.h>
47 #include <dev/ofw/ofw_bus_subr.h>
49 #include <arm/ti/ti_prcm.h>
50 #include <arm/ti/ti_hwmods.h>
51 #include <arm/ti/ti_scm.h>
53 #include "am335x_pwm.h"
54 #include "am335x_scm.h"
56 #define PWMSS_IDVER 0x00
57 #define PWMSS_SYSCONFIG 0x04
58 #define PWMSS_CLKCONFIG 0x08
59 #define CLKCONFIG_EPWMCLK_EN (1 << 8)
60 #define PWMSS_CLKSTATUS 0x0C
62 static device_probe_t am335x_pwmss_probe;
63 static device_attach_t am335x_pwmss_attach;
64 static device_detach_t am335x_pwmss_detach;
66 struct am335x_pwmss_softc {
67 struct simplebus_softc sc_simplebus;
72 static device_method_t am335x_pwmss_methods[] = {
73 DEVMETHOD(device_probe, am335x_pwmss_probe),
74 DEVMETHOD(device_attach, am335x_pwmss_attach),
75 DEVMETHOD(device_detach, am335x_pwmss_detach),
81 am335x_pwmss_probe(device_t dev)
84 if (!ofw_bus_status_okay(dev))
87 if (!ofw_bus_is_compatible(dev, "ti,am33xx-pwmss"))
90 device_set_desc(dev, "AM335x PWM");
92 return (BUS_PROBE_DEFAULT);
96 am335x_pwmss_attach(device_t dev)
98 struct am335x_pwmss_softc *sc;
102 sc = device_get_softc(dev);
105 sc->sc_clk = ti_hwmods_get_clock(dev);
106 if (sc->sc_clk == INVALID_CLK_IDENT) {
107 device_printf(dev, "failed to get device id based on ti,hwmods\n");
111 ti_prcm_clk_enable(sc->sc_clk);
112 ti_scm_reg_read_4(SCM_PWMSS_CTRL, ®);
113 switch (sc->sc_clk) {
125 device_printf(dev, "unknown pwmss clock id: %d\n", sc->sc_clk);
129 ti_scm_reg_write_4(SCM_PWMSS_CTRL, reg);
131 node = ofw_bus_get_node(dev);
136 simplebus_init(dev, node);
139 * Allow devices to identify.
141 bus_generic_probe(dev);
144 * Now walk the OFW tree and attach top-level devices.
146 for (node = OF_child(node); node > 0; node = OF_peer(node))
147 simplebus_add_device(dev, node, 0, NULL, -1, NULL);
149 return (bus_generic_attach(dev));
153 am335x_pwmss_detach(device_t dev)
159 DEFINE_CLASS_1(am335x_pwmss, am335x_pwmss_driver, am335x_pwmss_methods,
160 sizeof(struct am335x_pwmss_softc), simplebus_driver);
161 static devclass_t am335x_pwmss_devclass;
162 DRIVER_MODULE(am335x_pwmss, simplebus, am335x_pwmss_driver, am335x_pwmss_devclass, 0, 0);
163 MODULE_VERSION(am335x_pwmss, 1);