Re-implement clocks for these SoC by using now standard extres/clk framework. This is necessary for future expansion of these. The new implementation is (due to the size of the patch) only the initial (minimum) version. It will be updated/expanded with a subsequent set of particular patches. This patch is also not tested on OMAP4 based boards (BeagleBone), so all possible issues should be (and will be) fixed by ASAP once identified. Submited by: Oskar Holmlund (oskar.holmlund@ohdata.se) Differential Revision: https://reviews.freebsd.org/D25118
180 lines
4.7 KiB
C
180 lines
4.7 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_sysc.h>
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#include <dev/extres/syscon/syscon.h>
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#include "syscon_if.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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/* TRM chapter 2 memory map table 2-3 + VER register location */
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#define PWMSS_REV_0 0x0000
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#define PWMSS_REV_1 0x2000
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#define PWMSS_REV_2 0x4000
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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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struct syscon *syscon;
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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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uint64_t rev_address;
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phandle_t node, opp_table;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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/* FIXME: For now; Go and kidnap syscon from opp-table */
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opp_table = OF_finddevice("/opp-table");
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if (opp_table == -1) {
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device_printf(dev, "Cant find /opp-table\n");
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return (ENXIO);
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}
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if (!OF_hasprop(opp_table, "syscon")) {
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device_printf(dev, "/opp-table doesnt have required syscon property\n");
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return (ENXIO);
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}
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if (syscon_get_by_ofw_property(dev, opp_table, "syscon", &sc->syscon) != 0) {
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device_printf(dev, "Failed to get syscon\n");
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return (ENXIO);
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}
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ti_sysc_clock_enable(device_get_parent(dev));
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rev_address = ti_sysc_get_rev_address(device_get_parent(dev));
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switch (rev_address) {
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case PWMSS_REV_0:
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id = 0;
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break;
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case PWMSS_REV_1:
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id = 1;
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break;
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case PWMSS_REV_2:
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id = 2;
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break;
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}
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reg = SYSCON_READ_4(sc->syscon, SCM_PWMSS_CTRL);
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reg |= (1 << id);
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SYSCON_WRITE_4(sc->syscon, 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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MODULE_DEPEND(am335x_pwmss, ti_sysc, 1, 1, 1);
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