303 lines
6.4 KiB
C
303 lines
6.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2019 Justin Hibbits
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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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/module.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/disk.h>
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#include <sys/kernel.h>
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#include <sys/mutex.h>
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#include <sys/uio.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 <machine/bus.h>
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#include <machine/md_var.h>
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#include <machine/pio.h>
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#include <machine/resource.h>
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#include "opal.h"
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#include <sys/rman.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#define NVRAM_BUFSIZE (65536) /* 64k blocks */
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struct opal_nvram_softc {
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device_t sc_dev;
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struct mtx sc_mtx;
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uint32_t sc_size;
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uint8_t *sc_buf;
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vm_paddr_t sc_buf_phys;
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struct cdev *sc_cdev;
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int sc_isopen;
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};
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#define NVRAM_LOCK(sc) mtx_lock(&sc->sc_mtx)
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#define NVRAM_UNLOCK(sc) mtx_unlock(&sc->sc_mtx)
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/*
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* Device interface.
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*/
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static int opal_nvram_probe(device_t);
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static int opal_nvram_attach(device_t);
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static int opal_nvram_detach(device_t);
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/*
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* Driver methods.
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*/
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static device_method_t opal_nvram_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, opal_nvram_probe),
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DEVMETHOD(device_attach, opal_nvram_attach),
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DEVMETHOD(device_detach, opal_nvram_detach),
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{ 0, 0 }
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};
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static driver_t opal_nvram_driver = {
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"opal_nvram",
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opal_nvram_methods,
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sizeof(struct opal_nvram_softc)
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};
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static devclass_t opal_nvram_devclass;
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DRIVER_MODULE(opal_nvram, opal, opal_nvram_driver, opal_nvram_devclass, 0, 0);
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/*
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* Cdev methods.
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*/
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static d_open_t opal_nvram_open;
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static d_close_t opal_nvram_close;
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static d_read_t opal_nvram_read;
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static d_write_t opal_nvram_write;
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static d_ioctl_t opal_nvram_ioctl;
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static struct cdevsw opal_nvram_cdevsw = {
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.d_version = D_VERSION,
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.d_open = opal_nvram_open,
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.d_close = opal_nvram_close,
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.d_read = opal_nvram_read,
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.d_write = opal_nvram_write,
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.d_ioctl = opal_nvram_ioctl,
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.d_name = "nvram",
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};
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static int
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opal_nvram_probe(device_t dev)
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{
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if (!ofw_bus_is_compatible(dev, "ibm,opal-nvram"))
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return (ENXIO);
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device_set_desc(dev, "OPAL NVRAM");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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opal_nvram_attach(device_t dev)
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{
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struct opal_nvram_softc *sc;
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phandle_t node;
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int err;
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node = ofw_bus_get_node(dev);
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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err = OF_getencprop(node, "#bytes", &sc->sc_size,
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sizeof(sc->sc_size));
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if (err < 0)
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return (ENXIO);
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sc->sc_buf = contigmalloc(NVRAM_BUFSIZE, M_DEVBUF, M_WAITOK,
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0, BUS_SPACE_MAXADDR, PAGE_SIZE, 0);
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if (sc->sc_buf == NULL) {
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device_printf(dev, "No memory for buffer.\n");
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return (ENXIO);
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}
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sc->sc_buf_phys = pmap_kextract((vm_offset_t)sc->sc_buf);
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sc->sc_cdev = make_dev(&opal_nvram_cdevsw, 0, 0, 0, 0600,
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"nvram");
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sc->sc_cdev->si_drv1 = sc;
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mtx_init(&sc->sc_mtx, "opal_nvram", 0, MTX_DEF);
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return (0);
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}
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static int
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opal_nvram_detach(device_t dev)
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{
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struct opal_nvram_softc *sc;
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sc = device_get_softc(dev);
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if (sc->sc_cdev != NULL)
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destroy_dev(sc->sc_cdev);
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if (sc->sc_buf != NULL)
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contigfree(sc->sc_buf, NVRAM_BUFSIZE, M_DEVBUF);
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mtx_destroy(&sc->sc_mtx);
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return (0);
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}
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static int
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opal_nvram_open(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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struct opal_nvram_softc *sc = dev->si_drv1;
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int err;
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err = 0;
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NVRAM_LOCK(sc);
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if (sc->sc_isopen)
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err = EBUSY;
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else
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sc->sc_isopen = 1;
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NVRAM_UNLOCK(sc);
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return (err);
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}
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static int
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opal_nvram_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
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{
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struct opal_nvram_softc *sc = dev->si_drv1;
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NVRAM_LOCK(sc);
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sc->sc_isopen = 0;
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NVRAM_UNLOCK(sc);
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return (0);
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}
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static int
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opal_nvram_read(struct cdev *dev, struct uio *uio, int ioflag)
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{
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struct opal_nvram_softc *sc = dev->si_drv1;
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int rv, amnt;
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rv = 0;
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NVRAM_LOCK(sc);
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while (uio->uio_resid > 0) {
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amnt = MIN(uio->uio_resid, sc->sc_size - uio->uio_offset);
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amnt = MIN(amnt, NVRAM_BUFSIZE);
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if (amnt == 0)
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break;
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rv = opal_call(OPAL_READ_NVRAM, sc->sc_buf_phys,
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amnt, uio->uio_offset);
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if (rv != OPAL_SUCCESS) {
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switch (rv) {
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case OPAL_HARDWARE:
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rv = EIO;
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break;
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case OPAL_PARAMETER:
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rv = EINVAL;
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break;
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}
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break;
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}
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rv = uiomove(sc->sc_buf, amnt, uio);
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if (rv != 0)
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break;
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}
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NVRAM_UNLOCK(sc);
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return (rv);
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}
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static int
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opal_nvram_write(struct cdev *dev, struct uio *uio, int ioflag)
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{
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off_t offset;
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int rv, amnt;
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struct opal_nvram_softc *sc = dev->si_drv1;
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rv = 0;
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NVRAM_LOCK(sc);
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while (uio->uio_resid > 0) {
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amnt = MIN(uio->uio_resid, sc->sc_size - uio->uio_offset);
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amnt = MIN(amnt, NVRAM_BUFSIZE);
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if (amnt == 0) {
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rv = ENOSPC;
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break;
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}
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offset = uio->uio_offset;
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rv = uiomove(sc->sc_buf, amnt, uio);
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if (rv != 0)
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break;
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rv = opal_call(OPAL_WRITE_NVRAM, sc->sc_buf_phys, amnt,
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offset);
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if (rv != OPAL_SUCCESS) {
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switch (rv) {
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case OPAL_HARDWARE:
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rv = EIO;
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break;
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case OPAL_PARAMETER:
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rv = EINVAL;
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break;
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}
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break;
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}
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}
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NVRAM_UNLOCK(sc);
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return (rv);
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}
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static int
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opal_nvram_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
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struct thread *td)
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{
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struct opal_nvram_softc *sc = dev->si_drv1;
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switch (cmd) {
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case DIOCGMEDIASIZE:
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*(off_t *)data = sc->sc_size;
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return (0);
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}
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return (EINVAL);
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}
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