uart.c revision 1.11
1 /* $NetBSD: uart.c,v 1.11 2014/06/28 10:25:32 skrll 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 1.11 2014/06/28 10:25:32 skrll 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 while ((*((volatile unsigned long *)0xb2600018)) & 0x20) 175 continue; 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 continue; 184 return (*((volatile unsigned long *)0xb2600000)) & 0xff; 185 } 186 187 void 188 uart_cnpollc(dev_t dev, int on) 189 { 190 191 } 192 193 194 /* 195 * TTY device 196 */ 197 198 int 199 uart_open(dev_t dev, int flag, int mode, struct lwp *l) 200 { 201 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 202 struct tty *tp = sc->sc_tty; 203 int s, error = 0; 204 205 s = spltty(); 206 207 tp->t_dev = dev; 208 if ((tp->t_state & TS_ISOPEN) == 0) { 209 tp->t_state |= TS_CARR_ON; 210 ttychars(tp); 211 tp->t_iflag = TTYDEF_IFLAG; 212 tp->t_oflag = TTYDEF_OFLAG; 213 tp->t_cflag = TTYDEF_CFLAG | CLOCAL; 214 tp->t_lflag = TTYDEF_LFLAG; 215 tp->t_ispeed = tp->t_ospeed = 115200; 216 ttsetwater(tp); 217 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, 218 tp) != 0) { 219 splx(s); 220 return (EBUSY); 221 } 222 223 splx(s); 224 225 error = (*tp->t_linesw->l_open)(dev, tp); 226 227 return (error); 228 } 229 230 int 231 uart_close(dev_t dev, int flag, int mode, struct lwp *l) 232 { 233 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 234 struct tty *tp = sc->sc_tty; 235 236 (*tp->t_linesw->l_close)(tp, flag); 237 ttyclose(tp); 238 return (0); 239 } 240 241 242 int 243 uart_read(dev_t dev, struct uio *uio, int flag) 244 { 245 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 246 struct tty *tp = sc->sc_tty; 247 248 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 249 } 250 251 int 252 uart_write(dev_t dev, struct uio *uio, int flag) 253 { 254 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 255 struct tty *tp = sc->sc_tty; 256 257 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 258 } 259 260 int 261 uart_poll(dev_t dev, int events, struct lwp *l) 262 { 263 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 264 struct tty *tp = sc->sc_tty; 265 266 return ((*tp->t_linesw->l_poll)(tp, events, l)); 267 } 268 269 int 270 uart_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 271 { 272 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 273 struct tty *tp = sc->sc_tty; 274 int error; 275 276 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 277 if (error != EPASSTHROUGH) 278 return (error); 279 return (ttioctl(tp, cmd, data, flag, l)); 280 } 281 282 int 283 uart_param(struct tty *tp, struct termios *t) 284 { 285 286 return (0); 287 } 288 289 struct tty* 290 uart_tty(dev_t dev) 291 { 292 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 293 294 return sc->sc_tty; 295 } 296 297 298 void 299 uart_start(struct tty *tp) 300 { 301 int s,i,cnt; 302 303 s = spltty(); 304 if (tp->t_state & (TS_TTSTOP | TS_BUSY)) 305 goto out; 306 ttypull(tp); 307 tp->t_state |= TS_BUSY; 308 while (tp->t_outq.c_cc != 0) { 309 cnt = ndqb(&tp->t_outq, 0); 310 for (i=0; i<cnt; i++) 311 uart_cnputc(0,tp->t_outq.c_cf[i]); 312 ndflush(&tp->t_outq, cnt); 313 } 314 tp->t_state &= ~TS_BUSY; 315 out: 316 splx(s); 317 } 318 319 void 320 uart_stop(struct tty *tp, int flag) 321 { 322 int s; 323 324 s = spltty(); 325 if (tp->t_state & TS_BUSY) 326 if ((tp->t_state & TS_TTSTOP) == 0) 327 tp->t_state |= TS_FLUSH; 328 splx(s); 329 } 330 331 int 332 uart_intr(void *v) 333 { 334 struct uart_softc *sc = v; 335 struct tty *tp = sc->sc_tty; 336 int c; 337 338 if (REG_READ(UART_RSR_REG) & UART_RSR_BE) { 339 REG_WRITE(UART_ECR_REG, UART_ECR_RSR); 340 console_debugger(); 341 } 342 343 while ((REG_READ(UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) == 0) { 344 c = REG_READ(UART_DR_REG) & 0xff; 345 if (tp->t_state & TS_ISOPEN) 346 (*tp->t_linesw->l_rint)(c, tp); 347 } 348 return 0; 349 } 350
Indexes created Tue Sep 23 02:09:52 GMT 2025