add35ed5b8
to check the status property in their probe routines. Simplebus used to only instantiate its children whose status="okay" but that was improper behavior, fixed in r261352. Now that it doesn't check anymore and probes all its children; the children all have to do the check because really only the children know how to properly interpret their status property strings. Right now all existing drivers only understand "okay" versus something- that's-not-okay, so they all use the new ofw_bus_status_okay() helper.
159 lines
4.2 KiB
C
159 lines
4.2 KiB
C
/*-
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* Copyright (c) 2013 Ian Lepore <ian@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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/*
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* Analog PLL and power regulator driver for Freescale i.MX6 family of SoCs.
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*
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* We don't really do anything with analog PLLs, but the registers for
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* controlling them belong to the same block as the power regulator registers.
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* Since the newbus hierarchy makes it hard for anyone other than us to get at
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* them, we just export a couple public functions to allow the imx6 CCM clock
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* driver to read and write those registers.
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*
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* We also don't do anything about power regulation yet, but when the need
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* arises, this would be the place for that code to live.
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*
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* I have no idea where the "anatop" name comes from. It's in the standard DTS
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* source describing i.MX6 SoCs, and in the linux and u-boot code which comes
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* from Freescale, but it's not in the SoC manual.
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*/
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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/rman.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 <machine/bus.h>
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#include <arm/freescale/imx/imx6_anatopreg.h>
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#include <arm/freescale/imx/imx6_anatopvar.h>
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struct imx6_anatop_softc {
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device_t dev;
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struct resource *mem_res;
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};
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static struct imx6_anatop_softc *imx6_anatop_sc;
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uint32_t
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imx6_anatop_read_4(bus_size_t offset)
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{
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return (bus_read_4(imx6_anatop_sc->mem_res, offset));
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}
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void
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imx6_anatop_write_4(bus_size_t offset, uint32_t value)
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{
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bus_write_4(imx6_anatop_sc->mem_res, offset, value);
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}
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static int
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imx6_anatop_detach(device_t dev)
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{
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struct imx6_anatop_softc *sc;
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sc = device_get_softc(dev);
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if (sc->mem_res != NULL)
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bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);
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return (0);
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}
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static int
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imx6_anatop_attach(device_t dev)
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{
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struct imx6_anatop_softc *sc;
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int err, rid;
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sc = device_get_softc(dev);
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/* Allocate bus_space resources. */
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rid = 0;
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sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
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RF_ACTIVE);
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if (sc->mem_res == NULL) {
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device_printf(dev, "Cannot allocate memory resources\n");
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err = ENXIO;
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goto out;
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}
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imx6_anatop_sc = sc;
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err = 0;
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out:
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if (err != 0)
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imx6_anatop_detach(dev);
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return (err);
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}
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static int
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imx6_anatop_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, "fsl,imx6q-anatop") == 0)
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return (ENXIO);
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device_set_desc(dev, "Freescale i.MX6 Analog PLLs and Power");
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return (BUS_PROBE_DEFAULT);
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}
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static device_method_t imx6_anatop_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, imx6_anatop_probe),
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DEVMETHOD(device_attach, imx6_anatop_attach),
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DEVMETHOD(device_detach, imx6_anatop_detach),
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DEVMETHOD_END
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};
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static driver_t imx6_anatop_driver = {
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"imx6_anatop",
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imx6_anatop_methods,
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sizeof(struct imx6_anatop_softc)
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};
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static devclass_t imx6_anatop_devclass;
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DRIVER_MODULE(imx6_anatop, simplebus, imx6_anatop_driver, imx6_anatop_devclass, 0, 0);
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