freebsd-dev/sys/arm/freescale/imx/imx6_anatop.c

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/*-
* Copyright (c) 2013 Ian Lepore <ian@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("$FreeBSD$");
/*
* Analog PLL and power regulator driver for Freescale i.MX6 family of SoCs.
*
* We don't really do anything with analog PLLs, but the registers for
* controlling them belong to the same block as the power regulator registers.
* Since the newbus hierarchy makes it hard for anyone other than us to get at
* them, we just export a couple public functions to allow the imx6 CCM clock
* driver to read and write those registers.
*
* We also don't do anything about power regulation yet, but when the need
* arises, this would be the place for that code to live.
*
* I have no idea where the "anatop" name comes from. It's in the standard DTS
* source describing i.MX6 SoCs, and in the linux and u-boot code which comes
* from Freescale, but it's not in the SoC manual.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <machine/bus.h>
#include <arm/freescale/imx/imx6_anatopreg.h>
#include <arm/freescale/imx/imx6_anatopvar.h>
struct imx6_anatop_softc {
device_t dev;
struct resource *mem_res;
};
static struct imx6_anatop_softc *imx6_anatop_sc;
uint32_t
imx6_anatop_read_4(bus_size_t offset)
{
return (bus_read_4(imx6_anatop_sc->mem_res, offset));
}
void
imx6_anatop_write_4(bus_size_t offset, uint32_t value)
{
bus_write_4(imx6_anatop_sc->mem_res, offset, value);
}
static int
imx6_anatop_detach(device_t dev)
{
struct imx6_anatop_softc *sc;
sc = device_get_softc(dev);
if (sc->mem_res != NULL)
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);
return (0);
}
static int
imx6_anatop_attach(device_t dev)
{
struct imx6_anatop_softc *sc;
int err, rid;
sc = device_get_softc(dev);
/* Allocate bus_space resources. */
rid = 0;
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->mem_res == NULL) {
device_printf(dev, "Cannot allocate memory resources\n");
err = ENXIO;
goto out;
}
imx6_anatop_sc = sc;
err = 0;
out:
if (err != 0)
imx6_anatop_detach(dev);
return (err);
}
static int
imx6_anatop_probe(device_t dev)
{
if (ofw_bus_is_compatible(dev, "fsl,imx6q-anatop") == 0)
return (ENXIO);
device_set_desc(dev, "Freescale i.MX6 Analog PLLs and Power");
return (BUS_PROBE_DEFAULT);
}
static device_method_t imx6_anatop_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, imx6_anatop_probe),
DEVMETHOD(device_attach, imx6_anatop_attach),
DEVMETHOD(device_detach, imx6_anatop_detach),
DEVMETHOD_END
};
static driver_t imx6_anatop_driver = {
"imx6_anatop",
imx6_anatop_methods,
sizeof(struct imx6_anatop_softc)
};
static devclass_t imx6_anatop_devclass;
DRIVER_MODULE(imx6_anatop, simplebus, imx6_anatop_driver, imx6_anatop_devclass, 0, 0);