uart.c revision 1.7
1 /* $NetBSD: uart.c,v 1.7 2011/04/24 16:26:56 rmind Exp $ */ 2 3 /*- 4 * Copyright (c) 2007 Ruslan Ermilov and Vsevolod Lobko. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or 8 * without modification, are permitted provided that the following 9 * conditions 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 13 * copyright notice, this list of conditions and the following 14 * disclaimer in the documentation and/or other materials provided 15 * with the distribution. 16 * 3. The names of the authors may not be used to endorse or promote 17 * products derived from this software without specific prior 18 * written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY 21 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 23 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 25 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 27 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 29 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 31 * OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: uart.c,v 1.7 2011/04/24 16:26:56 rmind Exp $"); 36 37 #include <sys/types.h> 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/time.h> 42 #include <sys/device.h> 43 44 #include <sys/proc.h> 45 #include <sys/buf.h> 46 #include <sys/ioctl.h> 47 #include <sys/kauth.h> 48 #include <sys/tty.h> 49 #include <sys/file.h> 50 #include <sys/conf.h> 51 #include <sys/vnode.h> 52 53 #include <machine/intr.h> 54 #include <machine/bus.h> 55 56 #include <mips/adm5120/include/adm5120var.h> 57 #include <mips/adm5120/include/adm5120_obiovar.h> 58 #include <dev/cons.h> 59 #include <mips/adm5120/dev/uart.h> 60 61 #define REG_READ(o) bus_space_read_4(sc->sc_st, sc->sc_ioh, (o)) 62 #define REG_WRITE(o,v) bus_space_write_4(sc->sc_st, sc->sc_ioh, (o),(v)) 63 64 cons_decl(uart_); 65 66 extern struct consdev *cn_tab; /* physical console device info */ 67 68 dev_type_open(uart_open); 69 dev_type_open(uart_close); 70 dev_type_read(uart_read); 71 dev_type_write(uart_write); 72 dev_type_ioctl(uart_ioctl); 73 dev_type_tty(uart_tty); 74 dev_type_poll(uart_poll); 75 dev_type_stop(uart_stop); 76 77 const struct cdevsw uart_cdevsw = { 78 uart_open, uart_close, uart_read, uart_write, uart_ioctl, 79 uart_stop, uart_tty, uart_poll, nommap, ttykqfilter, D_TTY 80 }; 81 82 83 struct consdev uartcons = { 84 NULL, NULL, uart_cngetc, uart_cnputc, uart_cnpollc, NULL, NULL, NULL, 85 NODEV, CN_NORMAL 86 }; 87 88 struct uart_softc { 89 struct device sc_dev; 90 struct tty *sc_tty; 91 92 bus_space_tag_t sc_st; 93 bus_space_handle_t sc_ioh; 94 void *sc_ih; 95 }; 96 97 extern struct cfdriver uart_cd; 98 static int uart_consattached; 99 100 static int uart_probe (struct device *, struct cfdata *, void *); 101 static void uart_attach (struct device *, struct device *, void *); 102 103 void uart_start(struct tty *); 104 int uart_param(struct tty *, struct termios *); 105 int uart_intr(void *); 106 107 CFATTACH_DECL(uart, sizeof(struct uart_softc), 108 uart_probe, uart_attach, NULL, NULL); 109 110 static int 111 uart_probe(struct device *parent, struct cfdata *cf, void *aux) 112 { 113 struct obio_attach_args *aa = aux; 114 115 if (strcmp(aa->oba_name, cf->cf_name) == 0) 116 return (1); 117 118 return (0); 119 } 120 121 static void 122 uart_attach(struct device *parent, struct device *self, void *aux) 123 { 124 struct obio_attach_args *oba = aux; 125 struct uart_softc *sc = (struct uart_softc *)self; 126 struct tty *tp; 127 int maj, minor; 128 129 sc->sc_st = oba->oba_st; 130 if (bus_space_map(oba->oba_st, oba->oba_addr, 256, 0, 131 &sc->sc_ioh)) { 132 printf("%s: unable to map device\n", sc->sc_dev.dv_xname); 133 return; 134 } 135 136 /* Establish the interrupt. */ 137 sc->sc_ih = adm5120_intr_establish(oba->oba_irq, INTR_FIQ, uart_intr, sc); 138 if (sc->sc_ih == NULL) { 139 printf("%s: unable to establish interrupt\n", 140 sc->sc_dev.dv_xname); 141 return; 142 } 143 REG_WRITE(UART_CR_REG,UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN); 144 145 maj = cdevsw_lookup_major(&uart_cdevsw); 146 minor = sc->sc_dev.dv_unit; 147 148 tp = tty_alloc(); 149 tp->t_oproc = uart_start; 150 tp->t_param = uart_param; 151 sc->sc_tty = tp; 152 tp->t_dev = makedev(maj, minor); 153 tty_attach(tp); 154 if (minor == 0 && uart_consattached) { 155 /* attach as console*/ 156 cn_tab->cn_dev = tp->t_dev; 157 printf(" console"); 158 } 159 printf("\n"); 160 } 161 162 int 163 uart_cnattach(void) 164 { 165 cn_tab = &uartcons; 166 uart_consattached = 1; 167 return (0); 168 } 169 170 void 171 uart_cnputc(dev_t dev, int c) 172 { 173 char chr; 174 chr = c; 175 while ((*((volatile unsigned long *)0xb2600018)) & 0x20) ; 176 (*((volatile unsigned long *)0xb2600000)) = c; 177 } 178 179 int 180 uart_cngetc(dev_t dev) 181 { 182 while ((*((volatile unsigned long *)0xb2600018)) & 0x10) ; 183 return (*((volatile unsigned long *)0xb2600000)) & 0xff; 184 } 185 186 void 187 uart_cnpollc(dev_t dev, int on) 188 { 189 190 } 191 192 193 /* 194 * TTY device 195 */ 196 197 int 198 uart_open(dev_t dev, int flag, int mode, struct lwp *l) 199 { 200 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 201 struct tty *tp = sc->sc_tty; 202 int s, error = 0; 203 204 s = spltty(); 205 206 tp->t_dev = dev; 207 if ((tp->t_state & TS_ISOPEN) == 0) { 208 tp->t_state |= TS_CARR_ON; 209 ttychars(tp); 210 tp->t_iflag = TTYDEF_IFLAG; 211 tp->t_oflag = TTYDEF_OFLAG; 212 tp->t_cflag = TTYDEF_CFLAG | CLOCAL; 213 tp->t_lflag = TTYDEF_LFLAG; 214 tp->t_ispeed = tp->t_ospeed = 115200; 215 ttsetwater(tp); 216 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, 217 tp) != 0) { 218 splx(s); 219 return (EBUSY); 220 } 221 222 splx(s); 223 224 error = (*tp->t_linesw->l_open)(dev, tp); 225 226 return (error); 227 } 228 229 int 230 uart_close(dev_t dev, int flag, int mode, struct lwp *l) 231 { 232 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 233 struct tty *tp = sc->sc_tty; 234 235 (*tp->t_linesw->l_close)(tp, flag); 236 ttyclose(tp); 237 return (0); 238 } 239 240 241 int 242 uart_read(dev_t dev, struct uio *uio, int flag) 243 { 244 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 245 struct tty *tp = sc->sc_tty; 246 247 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 248 } 249 250 int 251 uart_write(dev_t dev, struct uio *uio, int flag) 252 { 253 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 254 struct tty *tp = sc->sc_tty; 255 256 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 257 } 258 259 int 260 uart_poll(dev_t dev, int events, struct lwp *l) 261 { 262 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 263 struct tty *tp = sc->sc_tty; 264 265 return ((*tp->t_linesw->l_poll)(tp, events, l)); 266 } 267 268 int 269 uart_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 270 { 271 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 272 struct tty *tp = sc->sc_tty; 273 int error; 274 275 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 276 if (error != EPASSTHROUGH) 277 return (error); 278 return (ttioctl(tp, cmd, data, flag, l)); 279 } 280 281 int 282 uart_param(struct tty *tp, struct termios *t) 283 { 284 285 return (0); 286 } 287 288 struct tty* 289 uart_tty(dev_t dev) 290 { 291 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 292 293 return sc->sc_tty; 294 } 295 296 297 void 298 uart_start(struct tty *tp) 299 { 300 int s,i,cnt; 301 302 s = spltty(); 303 if (tp->t_state & (TS_TTSTOP | TS_BUSY)) 304 goto out; 305 ttypull(tp); 306 tp->t_state |= TS_BUSY; 307 while (tp->t_outq.c_cc != 0) { 308 cnt = ndqb(&tp->t_outq, 0); 309 for (i=0; i<cnt; i++) 310 uart_cnputc(0,tp->t_outq.c_cf[i]); 311 ndflush(&tp->t_outq, cnt); 312 } 313 tp->t_state &= ~TS_BUSY; 314 out: 315 splx(s); 316 } 317 318 void 319 uart_stop(struct tty *tp, int flag) 320 { 321 int s; 322 323 s = spltty(); 324 if (tp->t_state & TS_BUSY) 325 if ((tp->t_state & TS_TTSTOP) == 0) 326 tp->t_state |= TS_FLUSH; 327 splx(s); 328 } 329 330 int 331 uart_intr(void *v) 332 { 333 struct uart_softc *sc = v; 334 struct tty *tp = sc->sc_tty; 335 int c, l_r; 336 337 if (REG_READ(UART_RSR_REG) & UART_RSR_BE) { 338 REG_WRITE(UART_ECR_REG, UART_ECR_RSR); 339 console_debugger(); 340 } 341 342 while ((REG_READ(UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) == 0) { 343 c = REG_READ(UART_DR_REG) & 0xff; 344 if (tp->t_state & TS_ISOPEN) 345 l_r = (*tp->t_linesw->l_rint)(c, tp); 346 } 347 return 0; 348 } 349
Indexes created Tue Sep 23 07:09:52 GMT 2025