1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #include "opt_ofw.h" 30 31 #include <sys/param.h> 32 #include <sys/kdb.h> 33 #include <sys/kernel.h> 34 #include <sys/priv.h> 35 #include <sys/systm.h> 36 #include <sys/types.h> 37 #include <sys/conf.h> 38 #include <sys/cons.h> 39 #include <sys/consio.h> 40 #include <sys/tty.h> 41 42 #include <dev/ofw/openfirm.h> 43 44 #include <ddb/ddb.h> 45 46 #ifndef OFWCONS_POLL_HZ 47 #define OFWCONS_POLL_HZ 4 /* 50-100 works best on Ultra2 */ 48 #endif 49 #define OFBURSTLEN 128 /* max number of bytes to write in one chunk */ 50 51 static tsw_open_t ofwtty_open; 52 static tsw_close_t ofwtty_close; 53 static tsw_outwakeup_t ofwtty_outwakeup; 54 55 static struct ttydevsw ofw_ttydevsw = { 56 .tsw_flags = TF_NOPREFIX, 57 .tsw_open = ofwtty_open, 58 .tsw_close = ofwtty_close, 59 .tsw_outwakeup = ofwtty_outwakeup, 60 }; 61 62 static int polltime; 63 static struct callout ofw_timer; 64 65 #if defined(KDB) 66 static int alt_break_state; 67 #endif 68 69 static void ofw_timeout(void *); 70 71 static cn_probe_t ofw_cnprobe; 72 static cn_init_t ofw_cninit; 73 static cn_term_t ofw_cnterm; 74 static cn_getc_t ofw_cngetc; 75 static cn_putc_t ofw_cnputc; 76 static cn_grab_t ofw_cngrab; 77 static cn_ungrab_t ofw_cnungrab; 78 79 CONSOLE_DRIVER(ofw); 80 81 static void 82 cn_drvinit(void *unused) 83 { 84 phandle_t options; 85 char output[32]; 86 struct tty *tp; 87 88 if (ofw_consdev.cn_pri != CN_DEAD && 89 ofw_consdev.cn_name[0] != '\0') { 90 tp = tty_alloc(&ofw_ttydevsw, NULL); 91 tty_makedev(tp, NULL, "%s", "ofwcons"); 92 93 /* 94 * XXX: This is a hack and it may result in two /dev/ttya 95 * XXX: devices on platforms where the sab driver works. 96 */ 97 if ((options = OF_finddevice("/options")) == -1 || 98 OF_getprop(options, "output-device", output, 99 sizeof(output)) == -1) 100 return; 101 if (strlen(output) > 0) 102 tty_makealias(tp, "%s", output); 103 callout_init_mtx(&ofw_timer, tty_getlock(tp), 0); 104 } 105 } 106 107 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL); 108 109 static pcell_t stdin; 110 static pcell_t stdout; 111 112 static int 113 ofwtty_open(struct tty *tp) 114 { 115 polltime = hz / OFWCONS_POLL_HZ; 116 if (polltime < 1) 117 polltime = 1; 118 119 callout_reset(&ofw_timer, polltime, ofw_timeout, tp); 120 121 return (0); 122 } 123 124 static void 125 ofwtty_close(struct tty *tp) 126 { 127 128 callout_stop(&ofw_timer); 129 } 130 131 static void 132 ofwtty_outwakeup(struct tty *tp) 133 { 134 int len; 135 u_char buf[OFBURSTLEN]; 136 137 for (;;) { 138 len = ttydisc_getc(tp, buf, sizeof buf); 139 if (len == 0) 140 break; 141 OF_write(stdout, buf, len); 142 } 143 } 144 145 static void 146 ofw_timeout(void *v) 147 { 148 struct tty *tp; 149 int c; 150 151 tp = (struct tty *)v; 152 153 tty_assert_locked(tp); 154 while ((c = ofw_cngetc(NULL)) != -1) 155 ttydisc_rint(tp, c, 0); 156 ttydisc_rint_done(tp); 157 158 callout_schedule(&ofw_timer, polltime); 159 } 160 161 static void 162 ofw_cnprobe(struct consdev *cp) 163 { 164 int chosen; 165 166 if ((chosen = OF_finddevice("/chosen")) == -1) { 167 cp->cn_pri = CN_DEAD; 168 return; 169 } 170 171 if (OF_getencprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1) { 172 cp->cn_pri = CN_DEAD; 173 return; 174 } 175 176 if (OF_getencprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1) { 177 cp->cn_pri = CN_DEAD; 178 return; 179 } 180 181 cp->cn_pri = CN_LOW; 182 } 183 184 static void 185 ofw_cninit(struct consdev *cp) 186 { 187 188 /* XXX: This is the alias, but that should be good enough */ 189 strcpy(cp->cn_name, "ofwcons"); 190 } 191 192 static void 193 ofw_cnterm(struct consdev *cp) 194 { 195 } 196 197 static void 198 ofw_cngrab(struct consdev *cp) 199 { 200 } 201 202 static void 203 ofw_cnungrab(struct consdev *cp) 204 { 205 } 206 207 static int 208 ofw_cngetc(struct consdev *cp) 209 { 210 unsigned char ch; 211 212 if (OF_read(stdin, &ch, 1) > 0) { 213 #if defined(KDB) 214 kdb_alt_break(ch, &alt_break_state); 215 #endif 216 return (ch); 217 } 218 219 return (-1); 220 } 221 222 static void 223 ofw_cnputc(struct consdev *cp, int c) 224 { 225 char cbuf; 226 227 if (c == '\n') { 228 cbuf = '\r'; 229 OF_write(stdout, &cbuf, 1); 230 } 231 232 cbuf = c; 233 OF_write(stdout, &cbuf, 1); 234 } 235