cfe_console.c revision 266891
1/*- 2 * Copyright (c) 2007 Bruce M. Simpson. 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 THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/dev/cfe/cfe_console.c 266891 2014-05-30 15:46:10Z jhb $"); 29 30#include <sys/param.h> 31#include <sys/kdb.h> 32#include <sys/kernel.h> 33#include <sys/priv.h> 34#include <sys/systm.h> 35#include <sys/types.h> 36#include <sys/conf.h> 37#include <sys/cons.h> 38#include <sys/consio.h> 39#include <sys/tty.h> 40 41#include <dev/cfe/cfe_api.h> 42#include <dev/cfe/cfe_error.h> 43 44#include <ddb/ddb.h> 45 46#ifndef CFECONS_POLL_HZ 47#define CFECONS_POLL_HZ 4 48#endif 49#define CFEBURSTLEN 128 /* max number of bytes to write in one chunk */ 50 51static tsw_open_t cfe_tty_open; 52static tsw_close_t cfe_tty_close; 53static tsw_outwakeup_t cfe_tty_outwakeup; 54 55static struct ttydevsw cfe_ttydevsw = { 56 .tsw_flags = TF_NOPREFIX, 57 .tsw_open = cfe_tty_open, 58 .tsw_close = cfe_tty_close, 59 .tsw_outwakeup = cfe_tty_outwakeup, 60}; 61 62static int conhandle = -1; 63/* XXX does cfe have to poll? */ 64static int polltime; 65static struct callout cfe_timer; 66 67#if defined(KDB) 68static int alt_break_state; 69#endif 70 71static void cfe_timeout(void *); 72 73static cn_probe_t cfe_cnprobe; 74static cn_init_t cfe_cninit; 75static cn_term_t cfe_cnterm; 76static cn_getc_t cfe_cngetc; 77static cn_putc_t cfe_cnputc; 78static cn_grab_t cfe_cngrab; 79static cn_ungrab_t cfe_cnungrab; 80 81CONSOLE_DRIVER(cfe); 82 83static void 84cn_drvinit(void *unused) 85{ 86 struct tty *tp; 87 88 if (cfe_consdev.cn_pri != CN_DEAD && 89 cfe_consdev.cn_name[0] != '\0') { 90 tp = tty_alloc(&cfe_ttydevsw, NULL); 91 callout_init_mtx(&cfe_timer, tty_getlock(tp), 0); 92 tty_makedev(tp, NULL, "cfecons"); 93 } 94} 95 96static int 97cfe_tty_open(struct tty *tp) 98{ 99 polltime = hz / CFECONS_POLL_HZ; 100 if (polltime < 1) 101 polltime = 1; 102 callout_reset(&cfe_timer, polltime, cfe_timeout, tp); 103 104 return (0); 105} 106 107static void 108cfe_tty_close(struct tty *tp) 109{ 110 111 callout_stop(&cfe_timer); 112} 113 114static void 115cfe_tty_outwakeup(struct tty *tp) 116{ 117 int len, written, rc; 118 u_char buf[CFEBURSTLEN]; 119 120 for (;;) { 121 len = ttydisc_getc(tp, buf, sizeof buf); 122 if (len == 0) 123 break; 124 125 written = 0; 126 while (written < len) { 127 rc = cfe_write(conhandle, &buf[written], len - written); 128 if (rc < 0) 129 break; 130 written += rc; 131 } 132 } 133} 134 135static void 136cfe_timeout(void *v) 137{ 138 struct tty *tp; 139 int c; 140 141 tp = (struct tty *)v; 142 143 tty_lock_assert(tp, MA_OWNED); 144 while ((c = cfe_cngetc(NULL)) != -1) 145 ttydisc_rint(tp, c, 0); 146 ttydisc_rint_done(tp); 147 148 callout_reset(&cfe_timer, polltime, cfe_timeout, tp); 149} 150 151static void 152cfe_cnprobe(struct consdev *cp) 153{ 154 155 conhandle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE); 156 if (conhandle < 0) { 157 cp->cn_pri = CN_DEAD; 158 return; 159 } 160 161 /* XXX */ 162 if (bootverbose) { 163 char *bootmsg = "Using CFE firmware console.\n"; 164 int i; 165 166 for (i = 0; i < strlen(bootmsg); i++) 167 cfe_cnputc(cp, bootmsg[i]); 168 } 169 170 cp->cn_pri = CN_LOW; 171} 172 173static void 174cfe_cninit(struct consdev *cp) 175{ 176 177 strcpy(cp->cn_name, "cfecons"); 178} 179 180static void 181cfe_cnterm(struct consdev *cp) 182{ 183 184} 185 186static void 187cfe_cngrab(struct consdev *cp) 188{ 189 190} 191 192static void 193cfe_cnungrab(struct consdev *cp) 194{ 195 196} 197 198static int 199cfe_cngetc(struct consdev *cp) 200{ 201 unsigned char ch; 202 203 if (cfe_read(conhandle, &ch, 1) == 1) { 204#if defined(KDB) 205 kdb_alt_break(ch, &alt_break_state); 206#endif 207 return (ch); 208 } 209 210 return (-1); 211} 212 213static void 214cfe_cnputc(struct consdev *cp, int c) 215{ 216 char cbuf; 217 218 if (c == '\n') 219 cfe_cnputc(cp, '\r'); 220 221 cbuf = c; 222 while (cfe_write(conhandle, &cbuf, 1) == 0) 223 continue; 224} 225 226SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL); 227