174 lines
3.7 KiB
C
174 lines
3.7 KiB
C
/*-
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* Copyright (c) 2015 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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/*
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* System Reset Control for iMX6
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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_src.h>
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#define SRC_SCR 0
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#define SW_IPU1_RST (1 << 3)
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struct src_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 src_softc *src_sc;
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static inline uint32_t
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RD4(struct src_softc *sc, bus_size_t off)
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{
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return (bus_read_4(sc->mem_res, off));
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}
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static inline void
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WR4(struct src_softc *sc, bus_size_t off, uint32_t val)
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{
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bus_write_4(sc->mem_res, off, val);
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}
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int
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src_reset_ipu(void)
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{
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uint32_t reg;
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int timeout = 10000;
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if (src_sc == NULL)
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return (-1);
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reg = RD4(src_sc, SRC_SCR);
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reg |= SW_IPU1_RST;
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WR4(src_sc, SRC_SCR, reg);
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while (timeout-- > 0) {
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reg = RD4(src_sc, SRC_SCR);
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if (reg & SW_IPU1_RST)
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DELAY(1);
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else
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break;
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}
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if (timeout < 0)
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return (-1);
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else
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return (0);
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}
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static int
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src_detach(device_t dev)
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{
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struct src_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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src_attach(device_t dev)
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{
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struct src_softc *sc;
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int err, rid;
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sc = device_get_softc(dev);
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err = 0;
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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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src_sc = sc;
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err = 0;
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out:
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if (err != 0)
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src_detach(dev);
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return (err);
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}
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static int
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src_probe(device_t dev)
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{
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if ((ofw_bus_is_compatible(dev, "fsl,imx6q-src") == 0) &&
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(ofw_bus_is_compatible(dev, "fsl,imx6-src") == 0))
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return (ENXIO);
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device_set_desc(dev, "Freescale i.MX6 System Reset Controller");
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return (BUS_PROBE_DEFAULT);
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}
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static device_method_t src_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, src_probe),
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DEVMETHOD(device_attach, src_attach),
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DEVMETHOD(device_detach, src_detach),
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DEVMETHOD_END
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};
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static driver_t src_driver = {
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"src",
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src_methods,
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sizeof(struct src_softc)
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};
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static devclass_t src_devclass;
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DRIVER_MODULE(src, simplebus, src_driver, src_devclass, 0, 0);
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