2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2019 Justin Hibbits
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
24 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/module.h>
36 #include <sys/kernel.h>
39 #include <dev/ofw/openfirm.h>
40 #include <dev/ofw/ofw_bus.h>
41 #include <dev/ofw/ofw_bus_subr.h>
43 #include <machine/bus.h>
44 #include <machine/md_var.h>
45 #include <machine/pio.h>
46 #include <machine/resource.h>
55 #define NVRAM_BUFSIZE (65536) /* 64k blocks */
57 struct opal_nvram_softc {
61 vm_paddr_t sc_buf_phys;
70 static int opal_nvram_probe(device_t);
71 static int opal_nvram_attach(device_t);
72 static int opal_nvram_detach(device_t);
77 static device_method_t opal_nvram_methods[] = {
78 /* Device interface */
79 DEVMETHOD(device_probe, opal_nvram_probe),
80 DEVMETHOD(device_attach, opal_nvram_attach),
81 DEVMETHOD(device_detach, opal_nvram_detach),
86 static driver_t opal_nvram_driver = {
89 sizeof(struct opal_nvram_softc)
92 static devclass_t opal_nvram_devclass;
94 DRIVER_MODULE(opal_nvram, opal, opal_nvram_driver, opal_nvram_devclass, 0, 0);
100 static d_open_t opal_nvram_open;
101 static d_close_t opal_nvram_close;
102 static d_read_t opal_nvram_read;
103 static d_write_t opal_nvram_write;
104 static d_ioctl_t opal_nvram_ioctl;
106 static struct cdevsw opal_nvram_cdevsw = {
107 .d_version = D_VERSION,
108 .d_flags = D_NEEDGIANT,
109 .d_open = opal_nvram_open,
110 .d_close = opal_nvram_close,
111 .d_read = opal_nvram_read,
112 .d_write = opal_nvram_write,
113 .d_ioctl = opal_nvram_ioctl,
118 opal_nvram_probe(device_t dev)
121 if (!ofw_bus_is_compatible(dev, "ibm,opal-nvram"))
124 device_set_desc(dev, "OPAL NVRAM");
125 return (BUS_PROBE_DEFAULT);
129 opal_nvram_attach(device_t dev)
131 struct opal_nvram_softc *sc;
135 node = ofw_bus_get_node(dev);
136 sc = device_get_softc(dev);
140 err = OF_getencprop(node, "#bytes", &sc->sc_size,
141 sizeof(sc->sc_size));
146 sc->sc_buf = contigmalloc(NVRAM_BUFSIZE, M_DEVBUF, M_WAITOK,
147 0, BUS_SPACE_MAXADDR, PAGE_SIZE, 0);
148 if (sc->sc_buf == NULL) {
149 device_printf(dev, "No memory for buffer.\n");
152 sc->sc_buf_phys = pmap_kextract((vm_offset_t)sc->sc_buf);
153 sc->sc_cdev = make_dev(&opal_nvram_cdevsw, 0, 0, 0, 0600,
155 sc->sc_cdev->si_drv1 = sc;
161 opal_nvram_detach(device_t dev)
163 struct opal_nvram_softc *sc;
165 sc = device_get_softc(dev);
167 if (sc->sc_cdev != NULL)
168 destroy_dev(sc->sc_cdev);
169 if (sc->sc_buf != NULL)
170 contigfree(sc->sc_buf, NVRAM_BUFSIZE, M_DEVBUF);
176 opal_nvram_open(struct cdev *dev, int flags, int fmt, struct thread *td)
178 struct opal_nvram_softc *sc = dev->si_drv1;
187 opal_nvram_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
189 struct opal_nvram_softc *sc = dev->si_drv1;
196 opal_nvram_read(struct cdev *dev, struct uio *uio, int ioflag)
198 struct opal_nvram_softc *sc = dev->si_drv1;
202 while (uio->uio_resid > 0) {
203 amnt = MIN(uio->uio_resid, sc->sc_size - uio->uio_offset);
204 amnt = MIN(amnt, NVRAM_BUFSIZE);
208 rv = opal_call(OPAL_READ_NVRAM, sc->sc_buf_phys,
209 amnt, uio->uio_offset);
210 if (rv != OPAL_SUCCESS) {
221 rv = uiomove(sc->sc_buf, amnt, uio);
229 opal_nvram_write(struct cdev *dev, struct uio *uio, int ioflag)
233 struct opal_nvram_softc *sc = dev->si_drv1;
236 while (uio->uio_resid > 0) {
237 amnt = MIN(uio->uio_resid, sc->sc_size - uio->uio_offset);
238 amnt = MIN(amnt, NVRAM_BUFSIZE);
243 offset = uio->uio_offset;
244 rv = uiomove(sc->sc_buf, amnt, uio);
247 rv = opal_call(OPAL_WRITE_NVRAM, sc->sc_buf_phys, amnt,
249 if (rv != OPAL_SUCCESS) {
265 opal_nvram_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
268 struct opal_nvram_softc *sc = dev->si_drv1;
272 *(off_t *)data = sc->sc_size;