1/*-
2 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
3 * All rights reserved.
4 *
5 * This software was developed by SRI International and the University of
6 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
7 * ("CTSRD"), as part of the DARPA CRASH research programme.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31/*
32 * BERI memory interface.
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/bus.h>
41#include <sys/kernel.h>
42#include <sys/module.h>
43#include <sys/malloc.h>
44#include <sys/rman.h>
45#include <sys/timeet.h>
46#include <sys/timetc.h>
47#include <sys/conf.h>
48#include <sys/uio.h>
49
50#include <dev/fdt/fdt_common.h>
51#include <dev/ofw/openfirm.h>
52#include <dev/ofw/ofw_bus.h>
53#include <dev/ofw/ofw_bus_subr.h>
54
55#include <machine/bus.h>
56#include <machine/fdt.h>
57#include <machine/cpu.h>
58#include <machine/intr.h>
59
60struct beri_mem_softc {
61	struct resource		*res[1];
62	struct cdev		*mem_cdev;
63	device_t		dev;
64	int			mem_size;
65	int			mem_start;
66};
67
68static struct resource_spec beri_mem_spec[] = {
69	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
70	{ -1, 0 }
71};
72
73static int
74mem_open(struct cdev *dev, int flags __unused,
75    int fmt __unused, struct thread *td __unused)
76{
77	struct beri_mem_softc *sc;
78
79	sc = dev->si_drv1;
80
81	return (0);
82}
83
84static int
85mem_close(struct cdev *dev, int flags __unused,
86    int fmt __unused, struct thread *td __unused)
87{
88	struct beri_mem_softc *sc;
89
90	sc = dev->si_drv1;
91
92	return (0);
93}
94
95static int
96mem_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
97    struct thread *td)
98{
99
100	return (0);
101}
102
103static int
104mem_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
105    vm_memattr_t *memattr)
106{
107	struct beri_mem_softc *sc;
108
109	sc = dev->si_drv1;
110
111	if (offset < sc->mem_size) {
112		*paddr = sc->mem_start + offset;
113		return (0);
114        }
115
116	return (EINVAL);
117}
118
119static struct cdevsw mem_cdevsw = {
120	.d_version =	D_VERSION,
121	.d_open =	mem_open,
122	.d_close =	mem_close,
123	.d_ioctl =	mem_ioctl,
124	.d_mmap =	mem_mmap,
125	.d_name =	"BERI memory",
126};
127
128static int
129beri_mem_probe(device_t dev)
130{
131
132	if (!ofw_bus_status_okay(dev))
133		return (ENXIO);
134
135	if (!ofw_bus_is_compatible(dev, "sri-cambridge,beri-mem"))
136		return (ENXIO);
137
138	device_set_desc(dev, "BERI memory");
139	return (BUS_PROBE_DEFAULT);
140}
141
142static int
143beri_mem_attach(device_t dev)
144{
145	struct beri_mem_softc *sc;
146
147	sc = device_get_softc(dev);
148	sc->dev = dev;
149
150	if (bus_alloc_resources(dev, beri_mem_spec, sc->res)) {
151		device_printf(dev, "could not allocate resources\n");
152		return (ENXIO);
153	}
154
155	/* Memory info */
156	sc->mem_size = rman_get_size(sc->res[0]);
157	sc->mem_start = rman_get_start(sc->res[0]);
158
159	sc->mem_cdev = make_dev(&mem_cdevsw, 0, UID_ROOT, GID_WHEEL,
160	    0600, "beri_mem");
161
162	if (sc->mem_cdev == NULL) {
163		device_printf(dev, "Failed to create character device.\n");
164		return (ENXIO);
165	}
166
167	sc->mem_cdev->si_drv1 = sc;
168
169	return (0);
170}
171
172static device_method_t beri_mem_methods[] = {
173	DEVMETHOD(device_probe,		beri_mem_probe),
174	DEVMETHOD(device_attach,	beri_mem_attach),
175	{ 0, 0 }
176};
177
178static driver_t beri_mem_driver = {
179	"beri_mem",
180	beri_mem_methods,
181	sizeof(struct beri_mem_softc),
182};
183
184static devclass_t beri_mem_devclass;
185
186DRIVER_MODULE(beri_mem, simplebus, beri_mem_driver, beri_mem_devclass, 0, 0);
187