--- /dev/null
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2019 Justin Hibbits
+ *
+ * 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 ``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 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+#include <sys/conf.h>
+#include <sys/disk.h>
+#include <sys/kernel.h>
+#include <sys/uio.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <machine/bus.h>
+#include <machine/md_var.h>
+#include <machine/pio.h>
+#include <machine/resource.h>
+
+#include "opal.h"
+
+#include <sys/rman.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#define NVRAM_BUFSIZE (65536) /* 64k blocks */
+
+struct opal_nvram_softc {
+ device_t sc_dev;
+ uint32_t sc_size;
+ uint8_t *sc_buf;
+ vm_paddr_t sc_buf_phys;
+
+ struct cdev *sc_cdev;
+ int sc_isopen;
+};
+
+/*
+ * Device interface.
+ */
+static int opal_nvram_probe(device_t);
+static int opal_nvram_attach(device_t);
+static int opal_nvram_detach(device_t);
+
+/*
+ * Driver methods.
+ */
+static device_method_t opal_nvram_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, opal_nvram_probe),
+ DEVMETHOD(device_attach, opal_nvram_attach),
+ DEVMETHOD(device_detach, opal_nvram_detach),
+
+ { 0, 0 }
+};
+
+static driver_t opal_nvram_driver = {
+ "opal_nvram",
+ opal_nvram_methods,
+ sizeof(struct opal_nvram_softc)
+};
+
+static devclass_t opal_nvram_devclass;
+
+DRIVER_MODULE(opal_nvram, opal, opal_nvram_driver, opal_nvram_devclass, 0, 0);
+
+/*
+ * Cdev methods.
+ */
+
+static d_open_t opal_nvram_open;
+static d_close_t opal_nvram_close;
+static d_read_t opal_nvram_read;
+static d_write_t opal_nvram_write;
+static d_ioctl_t opal_nvram_ioctl;
+
+static struct cdevsw opal_nvram_cdevsw = {
+ .d_version = D_VERSION,
+ .d_flags = D_NEEDGIANT,
+ .d_open = opal_nvram_open,
+ .d_close = opal_nvram_close,
+ .d_read = opal_nvram_read,
+ .d_write = opal_nvram_write,
+ .d_ioctl = opal_nvram_ioctl,
+ .d_name = "nvram",
+};
+
+static int
+opal_nvram_probe(device_t dev)
+{
+
+ if (!ofw_bus_is_compatible(dev, "ibm,opal-nvram"))
+ return (ENXIO);
+
+ device_set_desc(dev, "OPAL NVRAM");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+opal_nvram_attach(device_t dev)
+{
+ struct opal_nvram_softc *sc;
+ phandle_t node;
+ int err;
+
+ node = ofw_bus_get_node(dev);
+ sc = device_get_softc(dev);
+
+ sc->sc_dev = dev;
+
+ err = OF_getencprop(node, "#bytes", &sc->sc_size,
+ sizeof(sc->sc_size));
+
+ if (err < 0)
+ return (ENXIO);
+
+ sc->sc_buf = contigmalloc(NVRAM_BUFSIZE, M_DEVBUF, M_WAITOK,
+ 0, BUS_SPACE_MAXADDR, PAGE_SIZE, 0);
+ if (sc->sc_buf == NULL) {
+ device_printf(dev, "No memory for buffer.\n");
+ return (ENXIO);
+ }
+ sc->sc_buf_phys = pmap_kextract((vm_offset_t)sc->sc_buf);
+ sc->sc_cdev = make_dev(&opal_nvram_cdevsw, 0, 0, 0, 0600,
+ "nvram");
+ sc->sc_cdev->si_drv1 = sc;
+
+ return (0);
+}
+
+static int
+opal_nvram_detach(device_t dev)
+{
+ struct opal_nvram_softc *sc;
+
+ sc = device_get_softc(dev);
+
+ if (sc->sc_cdev != NULL)
+ destroy_dev(sc->sc_cdev);
+ if (sc->sc_buf != NULL)
+ contigfree(sc->sc_buf, NVRAM_BUFSIZE, M_DEVBUF);
+
+ return (0);
+}
+
+static int
+opal_nvram_open(struct cdev *dev, int flags, int fmt, struct thread *td)
+{
+ struct opal_nvram_softc *sc = dev->si_drv1;
+
+ if (sc->sc_isopen)
+ return EBUSY;
+ sc->sc_isopen = 1;
+ return (0);
+}
+
+static int
+opal_nvram_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
+{
+ struct opal_nvram_softc *sc = dev->si_drv1;
+
+ sc->sc_isopen = 0;
+ return (0);
+}
+
+static int
+opal_nvram_read(struct cdev *dev, struct uio *uio, int ioflag)
+{
+ struct opal_nvram_softc *sc = dev->si_drv1;
+ int rv, amnt;
+
+ rv = 0;
+ while (uio->uio_resid > 0) {
+ amnt = MIN(uio->uio_resid, sc->sc_size - uio->uio_offset);
+ amnt = MIN(amnt, NVRAM_BUFSIZE);
+ if (amnt == 0)
+ break;
+
+ rv = opal_call(OPAL_READ_NVRAM, sc->sc_buf_phys,
+ amnt, uio->uio_offset);
+ if (rv != OPAL_SUCCESS) {
+ switch (rv) {
+ case OPAL_HARDWARE:
+ rv = EIO;
+ break;
+ case OPAL_PARAMETER:
+ rv = EINVAL;
+ break;
+ }
+ break;
+ }
+ rv = uiomove(sc->sc_buf, amnt, uio);
+ if (rv != 0)
+ break;
+ }
+ return (rv);
+}
+
+static int
+opal_nvram_write(struct cdev *dev, struct uio *uio, int ioflag)
+{
+ off_t offset;
+ int rv, amnt;
+ struct opal_nvram_softc *sc = dev->si_drv1;
+
+ rv = 0;
+ while (uio->uio_resid > 0) {
+ amnt = MIN(uio->uio_resid, sc->sc_size - uio->uio_offset);
+ amnt = MIN(amnt, NVRAM_BUFSIZE);
+ if (amnt == 0) {
+ rv = ENOSPC;
+ break;
+ }
+ offset = uio->uio_offset;
+ rv = uiomove(sc->sc_buf, amnt, uio);
+ if (rv != 0)
+ break;
+ rv = opal_call(OPAL_WRITE_NVRAM, sc->sc_buf_phys, amnt,
+ offset);
+ if (rv != OPAL_SUCCESS) {
+ switch (rv) {
+ case OPAL_HARDWARE:
+ rv = EIO;
+ break;
+ case OPAL_PARAMETER:
+ rv = EINVAL;
+ break;
+ }
+ break;
+ }
+ }
+ return (rv);
+}
+
+static int
+opal_nvram_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
+ struct thread *td)
+{
+ struct opal_nvram_softc *sc = dev->si_drv1;
+
+ switch (cmd) {
+ case DIOCGMEDIASIZE:
+ *(off_t *)data = sc->sc_size;
+ return (0);
+ }
+ return (EINVAL);
+}
projects / freebsd.git / commitdiff