1 /*- 2 * Copyright (C) 2001 Benno Rice. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 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_handle ofw_timeouthandle 64 = CALLOUT_HANDLE_INITIALIZER(&ofw_timeouthandle); 65 66 #if defined(KDB) 67 static int alt_break_state; 68 #endif 69 70 static void ofw_timeout(void *); 71 72 static cn_probe_t ofw_cnprobe; 73 static cn_init_t ofw_cninit; 74 static cn_term_t ofw_cnterm; 75 static cn_getc_t ofw_cngetc; 76 static cn_putc_t ofw_cnputc; 77 static cn_grab_t ofw_cngrab; 78 static cn_ungrab_t ofw_cnungrab; 79 80 CONSOLE_DRIVER(ofw); 81 82 static void 83 cn_drvinit(void *unused) 84 { 85 phandle_t options; 86 char output[32]; 87 struct tty *tp; 88 89 if (ofw_consdev.cn_pri != CN_DEAD && 90 ofw_consdev.cn_name[0] != '\0') { 91 tp = tty_alloc(&ofw_ttydevsw, NULL); 92 tty_makedev(tp, NULL, "%s", "ofwcons"); 93 94 /* 95 * XXX: This is a hack and it may result in two /dev/ttya 96 * XXX: devices on platforms where the sab driver works. 97 */ 98 if ((options = OF_finddevice("/options")) == -1 || 99 OF_getprop(options, "output-device", output, 100 sizeof(output)) == -1) 101 return; 102 if (strlen(output) > 0) 103 tty_makealias(tp, "%s", output); 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 ofw_timeouthandle = timeout(ofw_timeout, tp, polltime); 120 121 return (0); 122 } 123 124 static void 125 ofwtty_close(struct tty *tp) 126 { 127 128 /* XXX Should be replaced with callout_stop(9) */ 129 untimeout(ofw_timeout, tp, ofw_timeouthandle); 130 } 131 132 static void 133 ofwtty_outwakeup(struct tty *tp) 134 { 135 int len; 136 u_char buf[OFBURSTLEN]; 137 138 for (;;) { 139 len = ttydisc_getc(tp, buf, sizeof buf); 140 if (len == 0) 141 break; 142 OF_write(stdout, buf, len); 143 } 144 } 145 146 static void 147 ofw_timeout(void *v) 148 { 149 struct tty *tp; 150 int c; 151 152 tp = (struct tty *)v; 153 154 tty_lock(tp); 155 while ((c = ofw_cngetc(NULL)) != -1) 156 ttydisc_rint(tp, c, 0); 157 ttydisc_rint_done(tp); 158 tty_unlock(tp); 159 160 ofw_timeouthandle = timeout(ofw_timeout, tp, 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