1 /* $NetBSD: arcbios_tty.c,v 1.15 2006/10/01 19:28:43 elad Exp $ */ 2 3 /* 4 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. 5 * All rights reserved. 6 * 7 * Author: Chris G. Demetriou 8 * 9 * Permission to use, copy, modify and distribute this software and 10 * its documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie the 27 * rights to redistribute these changes. 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: arcbios_tty.c,v 1.15 2006/10/01 19:28:43 elad Exp $"); 32 33 #include <sys/param.h> 34 #include <sys/user.h> 35 #include <sys/uio.h> 36 #include <sys/systm.h> 37 #include <sys/callout.h> 38 #include <sys/kernel.h> 39 #include <sys/conf.h> 40 #include <sys/proc.h> 41 #include <sys/tty.h> 42 #include <sys/termios.h> 43 #include <sys/kauth.h> 44 45 #include <dev/cons.h> 46 47 #include <dev/arcbios/arcbios.h> 48 #include <dev/arcbios/arcbiosvar.h> 49 50 struct callout arcbios_tty_ch = CALLOUT_INITIALIZER; 51 52 static struct tty *arcbios_tty[1]; 53 54 void arcbios_tty_start(struct tty *); 55 void arcbios_tty_poll(void *); 56 int arcbios_tty_param(struct tty *, struct termios *); 57 58 dev_type_open(arcbios_ttyopen); 59 dev_type_close(arcbios_ttyclose); 60 dev_type_read(arcbios_ttyread); 61 dev_type_write(arcbios_ttywrite); 62 dev_type_ioctl(arcbios_ttyioctl); 63 dev_type_stop(arcbios_ttystop); 64 dev_type_tty(arcbios_ttytty); 65 dev_type_poll(arcbios_ttypoll); 66 67 const struct cdevsw arcbios_cdevsw = { 68 arcbios_ttyopen, arcbios_ttyclose, arcbios_ttyread, arcbios_ttywrite, 69 arcbios_ttyioctl, arcbios_ttystop, arcbios_ttytty, arcbios_ttypoll, 70 nommap, ttykqfilter, D_TTY, 71 }; 72 73 int 74 arcbios_ttyopen(dev_t dev, int flag, int mode, struct lwp *l) 75 { 76 int unit = minor(dev); 77 struct tty *tp; 78 int s, error = 0, setuptimeout = 0; 79 80 if (unit != 0) 81 return (ENODEV); 82 83 s = spltty(); 84 85 if (arcbios_tty[unit] == NULL) { 86 tp = arcbios_tty[unit] = ttymalloc(); 87 tty_attach(tp); 88 } else 89 tp = arcbios_tty[unit]; 90 91 tp->t_oproc = arcbios_tty_start; 92 tp->t_param = arcbios_tty_param; 93 tp->t_dev = dev; 94 95 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) { 96 splx(s); 97 return (EBUSY); 98 } 99 100 if ((tp->t_state & TS_ISOPEN) == 0) { 101 tp->t_state |= TS_CARR_ON; 102 ttychars(tp); 103 tp->t_iflag = TTYDEF_IFLAG; 104 tp->t_oflag = TTYDEF_OFLAG; 105 tp->t_cflag = TTYDEF_CFLAG | CLOCAL; 106 tp->t_lflag = TTYDEF_LFLAG; 107 tp->t_ispeed = tp->t_ospeed = 9600; 108 ttsetwater(tp); 109 110 setuptimeout = 1; 111 } 112 113 splx(s); 114 115 error = (*tp->t_linesw->l_open)(dev, tp); 116 if (error == 0 && setuptimeout) 117 callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp); 118 119 return (error); 120 } 121 122 int 123 arcbios_ttyclose(dev_t dev, int flag, int mode, struct lwp *l) 124 { 125 int unit = minor(dev); 126 struct tty *tp = arcbios_tty[unit]; 127 128 callout_stop(&arcbios_tty_ch); 129 (*tp->t_linesw->l_close)(tp, flag); 130 ttyclose(tp); 131 return (0); 132 } 133 134 int 135 arcbios_ttyread(dev_t dev, struct uio *uio, int flag) 136 { 137 struct tty *tp = arcbios_tty[minor(dev)]; 138 139 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 140 } 141 142 int 143 arcbios_ttywrite(dev_t dev, struct uio *uio, int flag) 144 { 145 struct tty *tp = arcbios_tty[minor(dev)]; 146 147 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 148 } 149 150 int 151 arcbios_ttypoll(dev_t dev, int events, struct lwp *l) 152 { 153 struct tty *tp = arcbios_tty[minor(dev)]; 154 155 return ((*tp->t_linesw->l_poll)(tp, events, l)); 156 } 157 158 int 159 arcbios_ttyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l) 160 { 161 int unit = minor(dev); 162 struct tty *tp = arcbios_tty[unit]; 163 int error; 164 165 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 166 if (error != EPASSTHROUGH) 167 return (error); 168 return (ttioctl(tp, cmd, data, flag, l)); 169 } 170 171 int 172 arcbios_tty_param(struct tty *tp, struct termios *t) 173 { 174 175 return (0); 176 } 177 178 void 179 arcbios_tty_start(struct tty *tp) 180 { 181 u_long count; 182 int s; 183 184 s = spltty(); 185 if (tp->t_state & (TS_TTSTOP | TS_BUSY)) 186 goto out; 187 if (tp->t_outq.c_cc <= tp->t_lowat) { 188 if (tp->t_state & TS_ASLEEP) { 189 tp->t_state &= ~TS_ASLEEP; 190 wakeup((caddr_t)&tp->t_outq); 191 } 192 selwakeup(&tp->t_wsel); 193 } 194 tp->t_state |= TS_BUSY; 195 while (tp->t_outq.c_cc != 0) { 196 (*ARCBIOS->Write)(ARCBIOS_STDOUT, tp->t_outq.c_cf, 197 ndqb(&tp->t_outq, 0), &count); 198 ndflush(&tp->t_outq, count); 199 } 200 tp->t_state &= ~TS_BUSY; 201 out: 202 splx(s); 203 } 204 205 void 206 arcbios_ttystop(struct tty *tp, int flag) 207 { 208 int s; 209 210 s = spltty(); 211 if (tp->t_state & TS_BUSY) 212 if ((tp->t_state & TS_TTSTOP) == 0) 213 tp->t_state |= TS_FLUSH; 214 splx(s); 215 } 216 217 static int 218 arcbios_tty_getchar(int *cp) 219 { 220 char c; 221 int32_t q; 222 u_long count; 223 224 q = ARCBIOS->GetReadStatus(ARCBIOS_STDIN); 225 226 if (q == 0) { 227 ARCBIOS->Read(ARCBIOS_STDIN, &c, 1, &count); 228 *cp = c; 229 230 return 1; 231 } 232 233 return 0; 234 } 235 236 void 237 arcbios_tty_poll(void *v) 238 { 239 struct tty *tp = v; 240 int c, l_r; 241 242 while (arcbios_tty_getchar(&c)) { 243 if (tp->t_state & TS_ISOPEN) 244 l_r = (*tp->t_linesw->l_rint)(c, tp); 245 } 246 callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp); 247 } 248 249 struct tty * 250 arcbios_ttytty(dev_t dev) 251 { 252 253 if (minor(dev) != 0) 254 panic("arcbios_ttytty: bogus"); 255 256 return (arcbios_tty[0]); 257 } 258