69d14913fc
"probe" method of those drivers to mean we're on e TI SoC. Introduce a new function, ti_soc_is_supported(), and use it to be sure we're really a TI system. PR: 222250
180 lines
4.9 KiB
C
180 lines
4.9 KiB
C
/*
|
|
* Copyright (c) 2010
|
|
* Ben Gray <ben.r.gray@gmail.com>.
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Ben Gray.
|
|
* 4. The name of the company nor the name of the author may be used to
|
|
* endorse or promote products derived from this software without specific
|
|
* prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY BEN GRAY ``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 BEN GRAY 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.
|
|
*/
|
|
|
|
/**
|
|
* SCM - System Control Module
|
|
*
|
|
* Hopefully in the end this module will contain a bunch of utility functions
|
|
* for configuring and querying the general system control registers, but for
|
|
* now it only does pin(pad) multiplexing.
|
|
*
|
|
* This is different from the GPIO module in that it is used to configure the
|
|
* pins between modules not just GPIO input/output.
|
|
*
|
|
* This file contains the generic top level driver, however it relies on chip
|
|
* specific settings and therefore expects an array of ti_scm_padconf structs
|
|
* call ti_padconf_devmap to be located somewhere in the kernel.
|
|
*
|
|
*/
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/rman.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
|
|
#include <machine/bus.h>
|
|
#include <machine/resource.h>
|
|
|
|
#include <dev/ofw/openfirm.h>
|
|
#include <dev/ofw/ofw_bus.h>
|
|
#include <dev/ofw/ofw_bus_subr.h>
|
|
#include <dev/fdt/fdt_pinctrl.h>
|
|
|
|
#include "ti_scm.h"
|
|
#include "ti_cpuid.h"
|
|
|
|
static struct resource_spec ti_scm_res_spec[] = {
|
|
{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* Control memory window */
|
|
{ -1, 0 }
|
|
};
|
|
|
|
static struct ti_scm_softc *ti_scm_sc;
|
|
|
|
#define ti_scm_read_4(sc, reg) \
|
|
bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
|
|
#define ti_scm_write_4(sc, reg, val) \
|
|
bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
|
|
|
|
/*
|
|
* Device part of OMAP SCM driver
|
|
*/
|
|
static int
|
|
ti_scm_probe(device_t dev)
|
|
{
|
|
|
|
if (!ti_soc_is_supported())
|
|
return (ENXIO);
|
|
|
|
if (!ofw_bus_status_okay(dev))
|
|
return (ENXIO);
|
|
|
|
if (!ofw_bus_is_compatible(dev, "syscon"))
|
|
return (ENXIO);
|
|
|
|
if (ti_scm_sc) {
|
|
return (EEXIST);
|
|
}
|
|
|
|
device_set_desc(dev, "TI Control Module");
|
|
return (BUS_PROBE_DEFAULT);
|
|
}
|
|
|
|
/**
|
|
* ti_scm_attach - attaches the timer to the simplebus
|
|
* @dev: new device
|
|
*
|
|
* Reserves memory and interrupt resources, stores the softc structure
|
|
* globally and registers both the timecount and eventtimer objects.
|
|
*
|
|
* RETURNS
|
|
* Zero on success or ENXIO if an error occuried.
|
|
*/
|
|
static int
|
|
ti_scm_attach(device_t dev)
|
|
{
|
|
struct ti_scm_softc *sc = device_get_softc(dev);
|
|
|
|
sc->sc_dev = dev;
|
|
|
|
if (bus_alloc_resources(dev, ti_scm_res_spec, sc->sc_res)) {
|
|
device_printf(dev, "could not allocate resources\n");
|
|
return (ENXIO);
|
|
}
|
|
|
|
/* Global timer interface */
|
|
sc->sc_bst = rman_get_bustag(sc->sc_res[0]);
|
|
sc->sc_bsh = rman_get_bushandle(sc->sc_res[0]);
|
|
|
|
ti_scm_sc = sc;
|
|
|
|
/* Attach platform extensions, if any. */
|
|
bus_generic_probe(dev);
|
|
|
|
return (bus_generic_attach(dev));
|
|
}
|
|
|
|
int
|
|
ti_scm_reg_read_4(uint32_t reg, uint32_t *val)
|
|
{
|
|
if (!ti_scm_sc)
|
|
return (ENXIO);
|
|
|
|
*val = ti_scm_read_4(ti_scm_sc, reg);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
ti_scm_reg_write_4(uint32_t reg, uint32_t val)
|
|
{
|
|
if (!ti_scm_sc)
|
|
return (ENXIO);
|
|
|
|
ti_scm_write_4(ti_scm_sc, reg, val);
|
|
return (0);
|
|
}
|
|
|
|
|
|
static device_method_t ti_scm_methods[] = {
|
|
DEVMETHOD(device_probe, ti_scm_probe),
|
|
DEVMETHOD(device_attach, ti_scm_attach),
|
|
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t ti_scm_driver = {
|
|
"ti_scm",
|
|
ti_scm_methods,
|
|
sizeof(struct ti_scm_softc),
|
|
};
|
|
|
|
static devclass_t ti_scm_devclass;
|
|
|
|
EARLY_DRIVER_MODULE(ti_scm, simplebus, ti_scm_driver, ti_scm_devclass, 0, 0,
|
|
BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
|