164 lines
4.2 KiB
C
164 lines
4.2 KiB
C
/*-
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* Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <dev/fdt/simplebus.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <arm/ti/ti_prcm.h>
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#include <arm/ti/ti_hwmods.h>
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#include <arm/ti/ti_scm.h>
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#include "am335x_pwm.h"
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#include "am335x_scm.h"
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#define PWMSS_IDVER 0x00
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#define PWMSS_SYSCONFIG 0x04
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#define PWMSS_CLKCONFIG 0x08
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#define CLKCONFIG_EPWMCLK_EN (1 << 8)
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#define PWMSS_CLKSTATUS 0x0C
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static device_probe_t am335x_pwmss_probe;
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static device_attach_t am335x_pwmss_attach;
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static device_detach_t am335x_pwmss_detach;
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struct am335x_pwmss_softc {
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struct simplebus_softc sc_simplebus;
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device_t sc_dev;
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clk_ident_t sc_clk;
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};
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static device_method_t am335x_pwmss_methods[] = {
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DEVMETHOD(device_probe, am335x_pwmss_probe),
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DEVMETHOD(device_attach, am335x_pwmss_attach),
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DEVMETHOD(device_detach, am335x_pwmss_detach),
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DEVMETHOD_END
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};
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static int
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am335x_pwmss_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_is_compatible(dev, "ti,am33xx-pwmss"))
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return (ENXIO);
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device_set_desc(dev, "AM335x PWM");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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am335x_pwmss_attach(device_t dev)
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{
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struct am335x_pwmss_softc *sc;
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uint32_t reg, id;
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phandle_t node;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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sc->sc_clk = ti_hwmods_get_clock(dev);
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if (sc->sc_clk == INVALID_CLK_IDENT) {
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device_printf(dev, "failed to get device id based on ti,hwmods\n");
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return (EINVAL);
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}
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ti_prcm_clk_enable(sc->sc_clk);
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ti_scm_reg_read_4(SCM_PWMSS_CTRL, ®);
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switch (sc->sc_clk) {
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case PWMSS0_CLK:
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id = 0;
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break;
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case PWMSS1_CLK:
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id = 1;
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break;
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case PWMSS2_CLK:
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id = 2;
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break;
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default:
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device_printf(dev, "unknown pwmss clock id: %d\n", sc->sc_clk);
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return (EINVAL);
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}
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reg |= (1 << id);
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ti_scm_reg_write_4(SCM_PWMSS_CTRL, reg);
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node = ofw_bus_get_node(dev);
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if (node == -1)
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return (ENXIO);
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simplebus_init(dev, node);
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/*
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* Allow devices to identify.
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*/
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bus_generic_probe(dev);
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/*
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* Now walk the OFW tree and attach top-level devices.
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*/
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for (node = OF_child(node); node > 0; node = OF_peer(node))
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simplebus_add_device(dev, node, 0, NULL, -1, NULL);
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return (bus_generic_attach(dev));
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}
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static int
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am335x_pwmss_detach(device_t dev)
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{
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return (0);
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}
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DEFINE_CLASS_1(am335x_pwmss, am335x_pwmss_driver, am335x_pwmss_methods,
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sizeof(struct am335x_pwmss_softc), simplebus_driver);
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static devclass_t am335x_pwmss_devclass;
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DRIVER_MODULE(am335x_pwmss, simplebus, am335x_pwmss_driver, am335x_pwmss_devclass, 0, 0);
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MODULE_VERSION(am335x_pwmss, 1);
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