175 lines
4.8 KiB
C
175 lines
4.8 KiB
C
/*
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* Copyright (c) 2010
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* Ben Gray <ben.r.gray@gmail.com>.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Ben Gray.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BEN GRAY ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL BEN GRAY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* SCM - System Control Module
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*
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* Hopefully in the end this module will contain a bunch of utility functions
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* for configuring and querying the general system control registers, but for
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* now it only does pin(pad) multiplexing.
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*
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* This is different from the GPIO module in that it is used to configure the
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* pins between modules not just GPIO input/output.
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*
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* This file contains the generic top level driver, however it relies on chip
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* specific settings and therefore expects an array of ti_scm_padconf structs
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* call ti_padconf_devmap to be located somewhere in the kernel.
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*
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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/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/cpufunc.h>
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#include <machine/resource.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/fdt/fdt_pinctrl.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 "ti_scm.h"
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static struct resource_spec ti_scm_res_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* Control memory window */
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{ -1, 0 }
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};
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static struct ti_scm_softc *ti_scm_sc;
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#define ti_scm_read_4(sc, reg) \
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bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
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#define ti_scm_write_4(sc, reg, val) \
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bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
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/*
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* Device part of OMAP SCM driver
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*/
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static int
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ti_scm_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, "syscon"))
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return (ENXIO);
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if (ti_scm_sc) {
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return (EEXIST);
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}
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device_set_desc(dev, "TI Control Module");
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return (BUS_PROBE_DEFAULT);
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}
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/**
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* ti_scm_attach - attaches the timer to the simplebus
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* @dev: new device
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*
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* Reserves memory and interrupt resources, stores the softc structure
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* globally and registers both the timecount and eventtimer objects.
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*
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* RETURNS
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* Zero on success or ENXIO if an error occuried.
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*/
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static int
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ti_scm_attach(device_t dev)
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{
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struct ti_scm_softc *sc = device_get_softc(dev);
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sc->sc_dev = dev;
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if (bus_alloc_resources(dev, ti_scm_res_spec, sc->sc_res)) {
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device_printf(dev, "could not allocate resources\n");
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return (ENXIO);
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}
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/* Global timer interface */
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sc->sc_bst = rman_get_bustag(sc->sc_res[0]);
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sc->sc_bsh = rman_get_bushandle(sc->sc_res[0]);
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ti_scm_sc = sc;
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return (0);
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}
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int
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ti_scm_reg_read_4(uint32_t reg, uint32_t *val)
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{
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if (!ti_scm_sc)
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return (ENXIO);
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*val = ti_scm_read_4(ti_scm_sc, reg);
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return (0);
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}
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int
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ti_scm_reg_write_4(uint32_t reg, uint32_t val)
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{
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if (!ti_scm_sc)
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return (ENXIO);
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ti_scm_write_4(ti_scm_sc, reg, val);
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return (0);
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}
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static device_method_t ti_scm_methods[] = {
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DEVMETHOD(device_probe, ti_scm_probe),
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DEVMETHOD(device_attach, ti_scm_attach),
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{ 0, 0 }
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};
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static driver_t ti_scm_driver = {
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"ti_scm",
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ti_scm_methods,
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sizeof(struct ti_scm_softc),
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};
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static devclass_t ti_scm_devclass;
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EARLY_DRIVER_MODULE(ti_scm, simplebus, ti_scm_driver, ti_scm_devclass, 0, 0,
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BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
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