1/*-
2 * Copyright (c) 2015-2017 Ruslan Bukin <br@bsdpad.com>
3 * All rights reserved.
4 *
5 * Portions of this software were developed by SRI International and the
6 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
7 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
8 *
9 * Portions of this software were developed by the University of Cambridge
10 * Computer Laboratory as part of the CTSRD Project, with support from the
11 * UK Higher Education Innovation Fund (HEIF).
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38#include <sys/param.h>
39#include <sys/kdb.h>
40#include <sys/kernel.h>
41#include <sys/priv.h>
42#include <sys/systm.h>
43#include <sys/types.h>
44#include <sys/conf.h>
45#include <sys/cons.h>
46#include <sys/consio.h>
47#include <sys/tty.h>
48#include <sys/bus.h>
49#include <sys/module.h>
50#include <sys/rman.h>
51
52#include <dev/ofw/openfirm.h>
53#include <ddb/ddb.h>
54
55#include <vm/vm.h>
56#include <vm/pmap.h>
57
58#include <dev/fdt/fdt_common.h>
59#include <dev/ofw/openfirm.h>
60#include <dev/ofw/ofw_bus.h>
61#include <dev/ofw/ofw_bus_subr.h>
62
63#include <machine/bus.h>
64#include <machine/cpu.h>
65#include <machine/intr.h>
66#include <machine/asm.h>
67#include <machine/trap.h>
68#include <machine/vmparam.h>
69#include <machine/sbi.h>
70
71/* bus softc */
72struct rcons_softc {
73	struct resource		*res[1];
74	void			*ihl[1];
75	device_t		dev;
76};
77
78/* CN Console interface */
79
80static tsw_outwakeup_t riscvtty_outwakeup;
81
82static struct ttydevsw riscv_ttydevsw = {
83	.tsw_flags	= TF_NOPREFIX,
84	.tsw_outwakeup	= riscvtty_outwakeup,
85};
86
87static int			polltime;
88static struct callout		riscv_callout;
89static struct tty 		*tp = NULL;
90
91#if defined(KDB)
92static int			alt_break_state;
93#endif
94
95static void	riscv_timeout(void *);
96
97static cn_probe_t	riscv_cnprobe;
98static cn_init_t	riscv_cninit;
99static cn_term_t	riscv_cnterm;
100static cn_getc_t	riscv_cngetc;
101static cn_putc_t	riscv_cnputc;
102static cn_grab_t	riscv_cngrab;
103static cn_ungrab_t	riscv_cnungrab;
104
105CONSOLE_DRIVER(riscv);
106
107#define	MAX_BURST_LEN		1
108
109static void
110riscv_putc(int c)
111{
112
113	sbi_console_putchar(c);
114}
115
116#ifdef EARLY_PRINTF
117early_putc_t *early_putc = riscv_putc;
118#endif
119
120static void
121cn_drvinit(void *unused)
122{
123
124	if (riscv_consdev.cn_pri != CN_DEAD &&
125	    riscv_consdev.cn_name[0] != '\0') {
126		tp = tty_alloc(&riscv_ttydevsw, NULL);
127		tty_init_console(tp, 0);
128		tty_makedev(tp, NULL, "%s", "rcons");
129
130		polltime = 1;
131
132		callout_init(&riscv_callout, 1);
133		callout_reset(&riscv_callout, polltime, riscv_timeout, NULL);
134	}
135}
136
137SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);
138
139static void
140riscvtty_outwakeup(struct tty *tp)
141{
142	u_char buf[MAX_BURST_LEN];
143	int len;
144	int i;
145
146	for (;;) {
147		len = ttydisc_getc(tp, buf, sizeof(buf));
148		if (len == 0)
149			break;
150
151		KASSERT(len == 1, ("tty error"));
152
153		for (i = 0; i < len; i++)
154			riscv_putc(buf[i]);
155	}
156}
157
158static void
159riscv_timeout(void *v)
160{
161	int c;
162
163	tty_lock(tp);
164	while ((c = riscv_cngetc(NULL)) != -1)
165		ttydisc_rint(tp, c, 0);
166	ttydisc_rint_done(tp);
167	tty_unlock(tp);
168
169	callout_reset(&riscv_callout, polltime, riscv_timeout, NULL);
170}
171
172static void
173riscv_cnprobe(struct consdev *cp)
174{
175
176	cp->cn_pri = CN_NORMAL;
177}
178
179static void
180riscv_cninit(struct consdev *cp)
181{
182
183	strcpy(cp->cn_name, "rcons");
184}
185
186static void
187riscv_cnterm(struct consdev *cp)
188{
189
190}
191
192static void
193riscv_cngrab(struct consdev *cp)
194{
195
196}
197
198static void
199riscv_cnungrab(struct consdev *cp)
200{
201
202}
203
204static int
205riscv_cngetc(struct consdev *cp)
206{
207	int ch;
208
209	ch = sbi_console_getchar();
210	if (ch > 0 && ch < 0xff) {
211#if defined(KDB)
212		kdb_alt_break(ch, &alt_break_state);
213#endif
214		return (ch);
215	}
216
217	return (-1);
218}
219
220static void
221riscv_cnputc(struct consdev *cp, int c)
222{
223
224	riscv_putc(c);
225}
226
227/* Bus interface */
228
229static int
230rcons_probe(device_t dev)
231{
232
233	device_set_desc(dev, "RISC-V console");
234
235	return (BUS_PROBE_DEFAULT);
236}
237
238static int
239rcons_attach(device_t dev)
240{
241	struct rcons_softc *sc;
242
243	if (device_get_unit(dev) != 0)
244		return (ENXIO);
245
246	sc = device_get_softc(dev);
247	sc->dev = dev;
248
249	csr_set(sie, SIE_SSIE);
250
251	bus_generic_attach(sc->dev);
252
253	return (0);
254}
255
256static device_method_t rcons_methods[] = {
257	DEVMETHOD(device_probe,		rcons_probe),
258	DEVMETHOD(device_attach,	rcons_attach),
259
260	DEVMETHOD_END
261};
262
263static driver_t rcons_driver = {
264	"rcons",
265	rcons_methods,
266	sizeof(struct rcons_softc)
267};
268
269static devclass_t rcons_devclass;
270
271DRIVER_MODULE(rcons, nexus, rcons_driver, rcons_devclass, 0, 0);
272