1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2007 Bruce M. Simpson. 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 THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/kdb.h> 34 #include <sys/kernel.h> 35 #include <sys/priv.h> 36 #include <sys/systm.h> 37 #include <sys/types.h> 38 #include <sys/conf.h> 39 #include <sys/cons.h> 40 #include <sys/consio.h> 41 #include <sys/tty.h> 42 43 #include <dev/cfe/cfe_api.h> 44 #include <dev/cfe/cfe_error.h> 45 46 #include <ddb/ddb.h> 47 48 #ifndef CFECONS_POLL_HZ 49 #define CFECONS_POLL_HZ 4 50 #endif 51 #define CFEBURSTLEN 128 /* max number of bytes to write in one chunk */ 52 53 static tsw_open_t cfe_tty_open; 54 static tsw_close_t cfe_tty_close; 55 static tsw_outwakeup_t cfe_tty_outwakeup; 56 57 static struct ttydevsw cfe_ttydevsw = { 58 .tsw_flags = TF_NOPREFIX, 59 .tsw_open = cfe_tty_open, 60 .tsw_close = cfe_tty_close, 61 .tsw_outwakeup = cfe_tty_outwakeup, 62 }; 63 64 static int conhandle = -1; 65 /* XXX does cfe have to poll? */ 66 static int polltime; 67 static struct callout cfe_timer; 68 69 #if defined(KDB) 70 static int alt_break_state; 71 #endif 72 73 static void cfe_timeout(void *); 74 75 static cn_probe_t cfe_cnprobe; 76 static cn_init_t cfe_cninit; 77 static cn_term_t cfe_cnterm; 78 static cn_getc_t cfe_cngetc; 79 static cn_putc_t cfe_cnputc; 80 static cn_grab_t cfe_cngrab; 81 static cn_ungrab_t cfe_cnungrab; 82 83 CONSOLE_DRIVER(cfe); 84 85 static void 86 cn_drvinit(void *unused) 87 { 88 struct tty *tp; 89 90 if (cfe_consdev.cn_pri != CN_DEAD && 91 cfe_consdev.cn_name[0] != '\0') { 92 tp = tty_alloc(&cfe_ttydevsw, NULL); 93 callout_init_mtx(&cfe_timer, tty_getlock(tp), 0); 94 tty_makedev(tp, NULL, "cfecons"); 95 } 96 } 97 98 static int 99 cfe_tty_open(struct tty *tp) 100 { 101 polltime = hz / CFECONS_POLL_HZ; 102 if (polltime < 1) 103 polltime = 1; 104 callout_reset(&cfe_timer, polltime, cfe_timeout, tp); 105 106 return (0); 107 } 108 109 static void 110 cfe_tty_close(struct tty *tp) 111 { 112 113 callout_stop(&cfe_timer); 114 } 115 116 static void 117 cfe_tty_outwakeup(struct tty *tp) 118 { 119 int len, written, rc; 120 u_char buf[CFEBURSTLEN]; 121 122 for (;;) { 123 len = ttydisc_getc(tp, buf, sizeof buf); 124 if (len == 0) 125 break; 126 127 written = 0; 128 while (written < len) { 129 rc = cfe_write(conhandle, &buf[written], len - written); 130 if (rc < 0) 131 break; 132 written += rc; 133 } 134 } 135 } 136 137 static void 138 cfe_timeout(void *v) 139 { 140 struct tty *tp; 141 int c; 142 143 tp = (struct tty *)v; 144 145 tty_assert_locked(tp); 146 while ((c = cfe_cngetc(NULL)) != -1) 147 ttydisc_rint(tp, c, 0); 148 ttydisc_rint_done(tp); 149 150 callout_reset(&cfe_timer, polltime, cfe_timeout, tp); 151 } 152 153 static void 154 cfe_cnprobe(struct consdev *cp) 155 { 156 157 conhandle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE); 158 if (conhandle < 0) { 159 cp->cn_pri = CN_DEAD; 160 return; 161 } 162 163 /* XXX */ 164 if (bootverbose) { 165 char *bootmsg = "Using CFE firmware console.\n"; 166 int i; 167 168 for (i = 0; i < strlen(bootmsg); i++) 169 cfe_cnputc(cp, bootmsg[i]); 170 } 171 172 cp->cn_pri = CN_LOW; 173 } 174 175 static void 176 cfe_cninit(struct consdev *cp) 177 { 178 179 strcpy(cp->cn_name, "cfecons"); 180 } 181 182 static void 183 cfe_cnterm(struct consdev *cp) 184 { 185 186 } 187 188 static void 189 cfe_cngrab(struct consdev *cp) 190 { 191 192 } 193 194 static void 195 cfe_cnungrab(struct consdev *cp) 196 { 197 198 } 199 200 static int 201 cfe_cngetc(struct consdev *cp) 202 { 203 unsigned char ch; 204 205 if (cfe_read(conhandle, &ch, 1) == 1) { 206 #if defined(KDB) 207 kdb_alt_break(ch, &alt_break_state); 208 #endif 209 return (ch); 210 } 211 212 return (-1); 213 } 214 215 static void 216 cfe_cnputc(struct consdev *cp, int c) 217 { 218 char cbuf; 219 220 if (c == '\n') 221 cfe_cnputc(cp, '\r'); 222 223 cbuf = c; 224 while (cfe_write(conhandle, &cbuf, 1) == 0) 225 continue; 226 } 227 228 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL); 229