#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/fdt/simplebus.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/ti/ti_prcm.h>
#include <arm/ti/ti_hwmods.h>
#include <arm/ti/ti_scm.h>
#include "am335x_pwm.h"
#include "am335x_scm.h"
#define PWMSS_IDVER 0x00
#define PWMSS_SYSCONFIG 0x04
#define PWMSS_CLKCONFIG 0x08
#define CLKCONFIG_EPWMCLK_EN (1 << 8)
#define PWMSS_CLKSTATUS 0x0C
static device_probe_t am335x_pwmss_probe;
static device_attach_t am335x_pwmss_attach;
static device_detach_t am335x_pwmss_detach;
struct am335x_pwmss_softc {
struct simplebus_softc sc_simplebus;
device_t sc_dev;
clk_ident_t sc_clk;
};
static device_method_t am335x_pwmss_methods[] = {
DEVMETHOD(device_probe, am335x_pwmss_probe),
DEVMETHOD(device_attach, am335x_pwmss_attach),
DEVMETHOD(device_detach, am335x_pwmss_detach),
DEVMETHOD_END
};
static int
am335x_pwmss_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "ti,am33xx-pwmss"))
return (ENXIO);
device_set_desc(dev, "AM335x PWM");
return (BUS_PROBE_DEFAULT);
}
static int
am335x_pwmss_attach(device_t dev)
{
struct am335x_pwmss_softc *sc;
uint32_t reg, id;
phandle_t node;
sc = device_get_softc(dev);
sc->sc_dev = dev;
sc->sc_clk = ti_hwmods_get_clock(dev);
if (sc->sc_clk == INVALID_CLK_IDENT) {
device_printf(dev, "failed to get device id based on ti,hwmods\n");
return (EINVAL);
}
ti_prcm_clk_enable(sc->sc_clk);
ti_scm_reg_read_4(SCM_PWMSS_CTRL, ®);
switch (sc->sc_clk) {
case PWMSS0_CLK:
id = 0;
break;
case PWMSS1_CLK:
id = 1;
break;
case PWMSS2_CLK:
id = 2;
break;
default:
device_printf(dev, "unknown pwmss clock id: %d\n", sc->sc_clk);
return (EINVAL);
}
reg |= (1 << id);
ti_scm_reg_write_4(SCM_PWMSS_CTRL, reg);
node = ofw_bus_get_node(dev);
if (node == -1)
return (ENXIO);
simplebus_init(dev, node);
/*
* Allow devices to identify.
*/
bus_generic_probe(dev);
/*
* Now walk the OFW tree and attach top-level devices.
*/
for (node = OF_child(node); node > 0; node = OF_peer(node))
simplebus_add_device(dev, node, 0, NULL, -1, NULL);
return (bus_generic_attach(dev));
}
static int
am335x_pwmss_detach(device_t dev)
{
return (0);
}
DEFINE_CLASS_1(am335x_pwmss, am335x_pwmss_driver, am335x_pwmss_methods,
sizeof(struct am335x_pwmss_softc), simplebus_driver);
static devclass_t am335x_pwmss_devclass;
DRIVER_MODULE(am335x_pwmss, simplebus, am335x_pwmss_driver, am335x_pwmss_devclass, 0, 0);
MODULE_VERSION(am335x_pwmss, 1);
