1/*-
2 * Copyright (c) 2022 Colin Percival
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/param.h>
27#include <sys/systm.h>
28#include <sys/bus.h>
29#include <sys/kernel.h>
30#include <sys/limits.h>
31#include <sys/malloc.h>
32#include <sys/module.h>
33#include <sys/rman.h>
34
35#include <machine/bus.h>
36#include <machine/resource.h>
37
38#include <dev/virtio/mmio/virtio_mmio.h>
39
40/* Parse <size>@<baseaddr>:<irq>[:<id>] and add a child. */
41static void
42parsearg(driver_t *driver, device_t parent, char * arg)
43{
44	device_t child;
45	char * p;
46	unsigned long sz;
47	unsigned long baseaddr;
48	unsigned long irq;
49	unsigned long id;
50
51	/* <size> */
52	sz = strtoul(arg, &p, 0);
53	if ((sz == 0) || (sz == ULONG_MAX))
54		goto bad;
55	switch (*p) {
56	case 'E': case 'e':
57		sz <<= 10;
58		/* FALLTHROUGH */
59	case 'P': case 'p':
60		sz <<= 10;
61		/* FALLTHROUGH */
62	case 'T': case 't':
63		sz <<= 10;
64		/* FALLTHROUGH */
65	case 'G': case 'g':
66		sz <<= 10;
67		/* FALLTHROUGH */
68	case 'M': case 'm':
69		sz <<= 10;
70		/* FALLTHROUGH */
71	case 'K': case 'k':
72		sz <<= 10;
73		p++;
74		break;
75	}
76
77	/* @<baseaddr> */
78	if (*p++ != '@')
79		goto bad;
80	baseaddr = strtoul(p, &p, 0);
81	if ((baseaddr == 0) || (baseaddr == ULONG_MAX))
82		goto bad;
83
84	/* :<irq> */
85	if (*p++ != ':')
86		goto bad;
87	irq = strtoul(p, &p, 0);
88	if ((irq == 0) || (irq == ULONG_MAX))
89		goto bad;
90
91	/* Optionally, :<id> */
92	if (*p) {
93		if (*p++ != ':')
94			goto bad;
95		id = strtoul(p, &p, 0);
96		if ((id == 0) || (id == ULONG_MAX))
97			goto bad;
98	} else {
99		id = 0;
100	}
101
102	/* Should have reached the end of the string. */
103	if (*p)
104		goto bad;
105
106	/* Create the child and assign its resources. */
107	child = BUS_ADD_CHILD(parent, 0, driver->name, id ? id : -1);
108	bus_set_resource(child, SYS_RES_MEMORY, 0, baseaddr, sz);
109	bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
110	device_set_driver(child, driver);
111
112	return;
113
114bad:
115	printf("Error parsing virtio_mmio parameter: %s\n", arg);
116}
117
118static void
119vtmmio_cmdline_identify(driver_t *driver, device_t parent)
120{
121	size_t n;
122	char name[] = "virtio_mmio.device_XXXX";
123	char * val;
124
125	/* First variable just has its own name. */
126	if ((val = kern_getenv("virtio_mmio.device")) == NULL)
127		return;
128	parsearg(driver, parent, val);
129	freeenv(val);
130
131	/* The rest have _%zu suffixes. */
132	for (n = 1; n <= 9999; n++) {
133		sprintf(name, "virtio_mmio.device_%zu", n);
134		if ((val = kern_getenv(name)) == NULL)
135			return;
136		parsearg(driver, parent, val);
137		freeenv(val);
138	}
139}
140
141static device_method_t vtmmio_cmdline_methods[] = {
142        /* Device interface. */
143	DEVMETHOD(device_identify,	vtmmio_cmdline_identify),
144	DEVMETHOD(device_probe,		vtmmio_probe),
145
146        DEVMETHOD_END
147};
148DEFINE_CLASS_1(virtio_mmio, vtmmio_cmdline_driver, vtmmio_cmdline_methods,
149    sizeof(struct vtmmio_softc), vtmmio_driver);
150DRIVER_MODULE(vtmmio_cmdline, nexus, vtmmio_cmdline_driver, 0, 0);
151