uart.c revision 1.10
1 /* $NetBSD: uart.c,v 1.10 2014/03/16 05:20:25 dholland 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 1.10 2014/03/16 05:20:25 dholland Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/bus.h> 39 #include <sys/conf.h> 40 #include <sys/device.h> 41 #include <sys/ioctl.h> 42 #include <sys/intr.h> 43 #include <sys/kauth.h> 44 #include <sys/kernel.h> 45 #include <sys/proc.h> 46 #include <sys/tty.h> 47 48 #include <dev/cons.h> 49 50 #include <mips/adm5120/include/adm5120var.h> 51 #include <mips/adm5120/include/adm5120_obiovar.h> 52 #include <mips/adm5120/dev/uart.h> 53 54 #define REG_READ(o) bus_space_read_4(sc->sc_st, sc->sc_ioh, (o)) 55 #define REG_WRITE(o,v) bus_space_write_4(sc->sc_st, sc->sc_ioh, (o),(v)) 56 57 cons_decl(uart_); 58 59 dev_type_open(uart_open); 60 dev_type_open(uart_close); 61 dev_type_read(uart_read); 62 dev_type_write(uart_write); 63 dev_type_ioctl(uart_ioctl); 64 dev_type_tty(uart_tty); 65 dev_type_poll(uart_poll); 66 dev_type_stop(uart_stop); 67 68 const struct cdevsw uart_cdevsw = { 69 .d_open = uart_open, 70 .d_close = uart_close, 71 .d_read = uart_read, 72 .d_write = uart_write, 73 .d_ioctl = uart_ioctl, 74 .d_stop = uart_stop, 75 .d_tty = uart_tty, 76 .d_poll = uart_poll, 77 .d_mmap = nommap, 78 .d_kqfilter = ttykqfilter, 79 .d_flag = D_TTY 80 }; 81 82 struct consdev uartcons = { 83 .cn_getc = uart_cngetc, 84 .cn_putc = uart_cnputc, 85 .cn_pollc = uart_cnpollc, 86 .cn_dev = NODEV, 87 .cn_pri = CN_NORMAL 88 }; 89 90 struct uart_softc { 91 device_t sc_dev; 92 struct tty * sc_tty; 93 94 bus_space_tag_t sc_st; 95 bus_space_handle_t sc_ioh; 96 void * sc_ih; 97 }; 98 99 extern struct cfdriver uart_cd; 100 static int uart_consattached; 101 102 static int uart_probe (device_t, cfdata_t, void *); 103 static void uart_attach (device_t, device_t, void *); 104 105 void uart_start(struct tty *); 106 int uart_param(struct tty *, struct termios *); 107 int uart_intr(void *); 108 109 CFATTACH_DECL_NEW(uart, sizeof(struct uart_softc), 110 uart_probe, uart_attach, NULL, NULL); 111 112 static int 113 uart_probe(device_t parent, cfdata_t cf, void *aux) 114 { 115 struct obio_attach_args * const oba = aux; 116 117 if (strcmp(oba->oba_name, cf->cf_name) == 0) 118 return (1); 119 120 return (0); 121 } 122 123 static void 124 uart_attach(device_t parent, device_t self, void *aux) 125 { 126 struct obio_attach_args * const oba = aux; 127 struct uart_softc * const sc = device_private(self); 128 struct tty *tp; 129 int maj, minor; 130 131 sc->sc_dev = self; 132 sc->sc_st = oba->oba_st; 133 if (bus_space_map(oba->oba_st, oba->oba_addr, 256, 0, &sc->sc_ioh)) { 134 aprint_error("unable to map device\n"); 135 return; 136 } 137 138 /* Establish the interrupt. */ 139 sc->sc_ih = adm5120_intr_establish(oba->oba_irq, INTR_FIQ, uart_intr, sc); 140 if (sc->sc_ih == NULL) { 141 aprint_error("unable to establish interrupt\n"); 142 return; 143 } 144 REG_WRITE(UART_CR_REG,UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN); 145 146 maj = cdevsw_lookup_major(&uart_cdevsw); 147 minor = device_unit(sc->sc_dev); 148 149 tp = tty_alloc(); 150 tp->t_oproc = uart_start; 151 tp->t_param = uart_param; 152 sc->sc_tty = tp; 153 tp->t_dev = makedev(maj, minor); 154 tty_attach(tp); 155 if (minor == 0 && uart_consattached) { 156 /* attach as console*/ 157 cn_tab->cn_dev = tp->t_dev; 158 aprint_normal(" console"); 159 } 160 aprint_normal("\n"); 161 } 162 163 int 164 uart_cnattach(void) 165 { 166 cn_tab = &uartcons; 167 uart_consattached = 1; 168 return (0); 169 } 170 171 void 172 uart_cnputc(dev_t dev, int c) 173 { 174 char chr; 175 chr = c; 176 while ((*((volatile unsigned long *)0xb2600018)) & 0x20) 177 continue; 178 (*((volatile unsigned long *)0xb2600000)) = c; 179 } 180 181 int 182 uart_cngetc(dev_t dev) 183 { 184 while ((*((volatile unsigned long *)0xb2600018)) & 0x10) 185 continue; 186 return (*((volatile unsigned long *)0xb2600000)) & 0xff; 187 } 188 189 void 190 uart_cnpollc(dev_t dev, int on) 191 { 192 193 } 194 195 196 /* 197 * TTY device 198 */ 199 200 int 201 uart_open(dev_t dev, int flag, int mode, struct lwp *l) 202 { 203 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 204 struct tty *tp = sc->sc_tty; 205 int s, error = 0; 206 207 s = spltty(); 208 209 tp->t_dev = dev; 210 if ((tp->t_state & TS_ISOPEN) == 0) { 211 tp->t_state |= TS_CARR_ON; 212 ttychars(tp); 213 tp->t_iflag = TTYDEF_IFLAG; 214 tp->t_oflag = TTYDEF_OFLAG; 215 tp->t_cflag = TTYDEF_CFLAG | CLOCAL; 216 tp->t_lflag = TTYDEF_LFLAG; 217 tp->t_ispeed = tp->t_ospeed = 115200; 218 ttsetwater(tp); 219 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, 220 tp) != 0) { 221 splx(s); 222 return (EBUSY); 223 } 224 225 splx(s); 226 227 error = (*tp->t_linesw->l_open)(dev, tp); 228 229 return (error); 230 } 231 232 int 233 uart_close(dev_t dev, int flag, int mode, struct lwp *l) 234 { 235 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 236 struct tty *tp = sc->sc_tty; 237 238 (*tp->t_linesw->l_close)(tp, flag); 239 ttyclose(tp); 240 return (0); 241 } 242 243 244 int 245 uart_read(dev_t dev, struct uio *uio, int flag) 246 { 247 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 248 struct tty *tp = sc->sc_tty; 249 250 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 251 } 252 253 int 254 uart_write(dev_t dev, struct uio *uio, int flag) 255 { 256 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 257 struct tty *tp = sc->sc_tty; 258 259 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 260 } 261 262 int 263 uart_poll(dev_t dev, int events, struct lwp *l) 264 { 265 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 266 struct tty *tp = sc->sc_tty; 267 268 return ((*tp->t_linesw->l_poll)(tp, events, l)); 269 } 270 271 int 272 uart_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 273 { 274 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 275 struct tty *tp = sc->sc_tty; 276 int error; 277 278 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 279 if (error != EPASSTHROUGH) 280 return (error); 281 return (ttioctl(tp, cmd, data, flag, l)); 282 } 283 284 int 285 uart_param(struct tty *tp, struct termios *t) 286 { 287 288 return (0); 289 } 290 291 struct tty* 292 uart_tty(dev_t dev) 293 { 294 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 295 296 return sc->sc_tty; 297 } 298 299 300 void 301 uart_start(struct tty *tp) 302 { 303 int s,i,cnt; 304 305 s = spltty(); 306 if (tp->t_state & (TS_TTSTOP | TS_BUSY)) 307 goto out; 308 ttypull(tp); 309 tp->t_state |= TS_BUSY; 310 while (tp->t_outq.c_cc != 0) { 311 cnt = ndqb(&tp->t_outq, 0); 312 for (i=0; i<cnt; i++) 313 uart_cnputc(0,tp->t_outq.c_cf[i]); 314 ndflush(&tp->t_outq, cnt); 315 } 316 tp->t_state &= ~TS_BUSY; 317 out: 318 splx(s); 319 } 320 321 void 322 uart_stop(struct tty *tp, int flag) 323 { 324 int s; 325 326 s = spltty(); 327 if (tp->t_state & TS_BUSY) 328 if ((tp->t_state & TS_TTSTOP) == 0) 329 tp->t_state |= TS_FLUSH; 330 splx(s); 331 } 332 333 int 334 uart_intr(void *v) 335 { 336 struct uart_softc *sc = v; 337 struct tty *tp = sc->sc_tty; 338 int c, l_r; 339 340 if (REG_READ(UART_RSR_REG) & UART_RSR_BE) { 341 REG_WRITE(UART_ECR_REG, UART_ECR_RSR); 342 console_debugger(); 343 } 344 345 while ((REG_READ(UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) == 0) { 346 c = REG_READ(UART_DR_REG) & 0xff; 347 if (tp->t_state & TS_ISOPEN) 348 l_r = (*tp->t_linesw->l_rint)(c, tp); 349 } 350 return 0; 351 } 352
Indexes created Tue Sep 23 07:09:52 GMT 2025