1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (C) 2001 Benno Rice. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include "opt_ofw.h" 32 33 #include <sys/param.h> 34 #include <sys/kdb.h> 35 #include <sys/kernel.h> 36 #include <sys/priv.h> 37 #include <sys/systm.h> 38 #include <sys/types.h> 39 #include <sys/conf.h> 40 #include <sys/cons.h> 41 #include <sys/consio.h> 42 #include <sys/tty.h> 43 44 #include <dev/ofw/openfirm.h> 45 46 #include <ddb/ddb.h> 47 48 #ifndef OFWCONS_POLL_HZ 49 #define OFWCONS_POLL_HZ 4 /* 50-100 works best on Ultra2 */ 50 #endif 51 #define OFBURSTLEN 128 /* max number of bytes to write in one chunk */ 52 53 static tsw_open_t ofwtty_open; 54 static tsw_close_t ofwtty_close; 55 static tsw_outwakeup_t ofwtty_outwakeup; 56 57 static struct ttydevsw ofw_ttydevsw = { 58 .tsw_flags = TF_NOPREFIX, 59 .tsw_open = ofwtty_open, 60 .tsw_close = ofwtty_close, 61 .tsw_outwakeup = ofwtty_outwakeup, 62 }; 63 64 static int polltime; 65 static struct callout ofw_timer; 66 67 #if defined(KDB) 68 static int alt_break_state; 69 #endif 70 71 static void ofw_timeout(void *); 72 73 static cn_probe_t ofw_cnprobe; 74 static cn_init_t ofw_cninit; 75 static cn_term_t ofw_cnterm; 76 static cn_getc_t ofw_cngetc; 77 static cn_putc_t ofw_cnputc; 78 static cn_grab_t ofw_cngrab; 79 static cn_ungrab_t ofw_cnungrab; 80 81 CONSOLE_DRIVER(ofw); 82 83 static void 84 cn_drvinit(void *unused) 85 { 86 phandle_t options; 87 char output[32]; 88 struct tty *tp; 89 90 if (ofw_consdev.cn_pri != CN_DEAD && 91 ofw_consdev.cn_name[0] != '\0') { 92 tp = tty_alloc(&ofw_ttydevsw, NULL); 93 tty_makedev(tp, NULL, "%s", "ofwcons"); 94 95 /* 96 * XXX: This is a hack and it may result in two /dev/ttya 97 * XXX: devices on platforms where the sab driver works. 98 */ 99 if ((options = OF_finddevice("/options")) == -1 || 100 OF_getprop(options, "output-device", output, 101 sizeof(output)) == -1) 102 return; 103 if (strlen(output) > 0) 104 tty_makealias(tp, "%s", output); 105 callout_init_mtx(&ofw_timer, tty_getlock(tp), 0); 106 } 107 } 108 109 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL); 110 111 static pcell_t stdin; 112 static pcell_t stdout; 113 114 static int 115 ofwtty_open(struct tty *tp) 116 { 117 polltime = hz / OFWCONS_POLL_HZ; 118 if (polltime < 1) 119 polltime = 1; 120 121 callout_reset(&ofw_timer, polltime, ofw_timeout, tp); 122 123 return (0); 124 } 125 126 static void 127 ofwtty_close(struct tty *tp) 128 { 129 130 callout_stop(&ofw_timer); 131 } 132 133 static void 134 ofwtty_outwakeup(struct tty *tp) 135 { 136 int len; 137 u_char buf[OFBURSTLEN]; 138 139 for (;;) { 140 len = ttydisc_getc(tp, buf, sizeof buf); 141 if (len == 0) 142 break; 143 OF_write(stdout, buf, len); 144 } 145 } 146 147 static void 148 ofw_timeout(void *v) 149 { 150 struct tty *tp; 151 int c; 152 153 tp = (struct tty *)v; 154 155 tty_lock_assert(tp, MA_OWNED); 156 while ((c = ofw_cngetc(NULL)) != -1) 157 ttydisc_rint(tp, c, 0); 158 ttydisc_rint_done(tp); 159 160 callout_schedule(&ofw_timer, polltime); 161 } 162 163 static void 164 ofw_cnprobe(struct consdev *cp) 165 { 166 int chosen; 167 168 if ((chosen = OF_finddevice("/chosen")) == -1) { 169 cp->cn_pri = CN_DEAD; 170 return; 171 } 172 173 if (OF_getencprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1) { 174 cp->cn_pri = CN_DEAD; 175 return; 176 } 177 178 if (OF_getencprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1) { 179 cp->cn_pri = CN_DEAD; 180 return; 181 } 182 183 cp->cn_pri = CN_LOW; 184 } 185 186 static void 187 ofw_cninit(struct consdev *cp) 188 { 189 190 /* XXX: This is the alias, but that should be good enough */ 191 strcpy(cp->cn_name, "ofwcons"); 192 } 193 194 static void 195 ofw_cnterm(struct consdev *cp) 196 { 197 } 198 199 static void 200 ofw_cngrab(struct consdev *cp) 201 { 202 } 203 204 static void 205 ofw_cnungrab(struct consdev *cp) 206 { 207 } 208 209 static int 210 ofw_cngetc(struct consdev *cp) 211 { 212 unsigned char ch; 213 214 if (OF_read(stdin, &ch, 1) > 0) { 215 #if defined(KDB) 216 kdb_alt_break(ch, &alt_break_state); 217 #endif 218 return (ch); 219 } 220 221 return (-1); 222 } 223 224 static void 225 ofw_cnputc(struct consdev *cp, int c) 226 { 227 char cbuf; 228 229 if (c == '\n') { 230 cbuf = '\r'; 231 OF_write(stdout, &cbuf, 1); 232 } 233 234 cbuf = c; 235 OF_write(stdout, &cbuf, 1); 236 } 237