1 /* $NetBSD: uart.c,v 1.9 2011/07/10 23:13:23 matt 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 1.9 2011/07/10 23:13:23 matt 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 uart_open, uart_close, uart_read, uart_write, uart_ioctl, 70 uart_stop, uart_tty, uart_poll, nommap, ttykqfilter, D_TTY 71 }; 72 73 struct consdev uartcons = { 74 .cn_getc = uart_cngetc, 75 .cn_putc = uart_cnputc, 76 .cn_pollc = uart_cnpollc, 77 .cn_dev = NODEV, 78 .cn_pri = CN_NORMAL 79 }; 80 81 struct uart_softc { 82 device_t sc_dev; 83 struct tty * sc_tty; 84 85 bus_space_tag_t sc_st; 86 bus_space_handle_t sc_ioh; 87 void * sc_ih; 88 }; 89 90 extern struct cfdriver uart_cd; 91 static int uart_consattached; 92 93 static int uart_probe (device_t, cfdata_t, void *); 94 static void uart_attach (device_t, device_t, void *); 95 96 void uart_start(struct tty *); 97 int uart_param(struct tty *, struct termios *); 98 int uart_intr(void *); 99 100 CFATTACH_DECL_NEW(uart, sizeof(struct uart_softc), 101 uart_probe, uart_attach, NULL, NULL); 102 103 static int 104 uart_probe(device_t parent, cfdata_t cf, void *aux) 105 { 106 struct obio_attach_args * const oba = aux; 107 108 if (strcmp(oba->oba_name, cf->cf_name) == 0) 109 return (1); 110 111 return (0); 112 } 113 114 static void 115 uart_attach(device_t parent, device_t self, void *aux) 116 { 117 struct obio_attach_args * const oba = aux; 118 struct uart_softc * const sc = device_private(self); 119 struct tty *tp; 120 int maj, minor; 121 122 sc->sc_dev = self; 123 sc->sc_st = oba->oba_st; 124 if (bus_space_map(oba->oba_st, oba->oba_addr, 256, 0, &sc->sc_ioh)) { 125 aprint_error("unable to map device\n"); 126 return; 127 } 128 129 /* Establish the interrupt. */ 130 sc->sc_ih = adm5120_intr_establish(oba->oba_irq, INTR_FIQ, uart_intr, sc); 131 if (sc->sc_ih == NULL) { 132 aprint_error("unable to establish interrupt\n"); 133 return; 134 } 135 REG_WRITE(UART_CR_REG,UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN); 136 137 maj = cdevsw_lookup_major(&uart_cdevsw); 138 minor = device_unit(sc->sc_dev); 139 140 tp = tty_alloc(); 141 tp->t_oproc = uart_start; 142 tp->t_param = uart_param; 143 sc->sc_tty = tp; 144 tp->t_dev = makedev(maj, minor); 145 tty_attach(tp); 146 if (minor == 0 && uart_consattached) { 147 /* attach as console*/ 148 cn_tab->cn_dev = tp->t_dev; 149 aprint_normal(" console"); 150 } 151 aprint_normal("\n"); 152 } 153 154 int 155 uart_cnattach(void) 156 { 157 cn_tab = &uartcons; 158 uart_consattached = 1; 159 return (0); 160 } 161 162 void 163 uart_cnputc(dev_t dev, int c) 164 { 165 char chr; 166 chr = c; 167 while ((*((volatile unsigned long *)0xb2600018)) & 0x20) 168 continue; 169 (*((volatile unsigned long *)0xb2600000)) = c; 170 } 171 172 int 173 uart_cngetc(dev_t dev) 174 { 175 while ((*((volatile unsigned long *)0xb2600018)) & 0x10) 176 continue; 177 return (*((volatile unsigned long *)0xb2600000)) & 0xff; 178 } 179 180 void 181 uart_cnpollc(dev_t dev, int on) 182 { 183 184 } 185 186 187 /* 188 * TTY device 189 */ 190 191 int 192 uart_open(dev_t dev, int flag, int mode, struct lwp *l) 193 { 194 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 195 struct tty *tp = sc->sc_tty; 196 int s, error = 0; 197 198 s = spltty(); 199 200 tp->t_dev = dev; 201 if ((tp->t_state & TS_ISOPEN) == 0) { 202 tp->t_state |= TS_CARR_ON; 203 ttychars(tp); 204 tp->t_iflag = TTYDEF_IFLAG; 205 tp->t_oflag = TTYDEF_OFLAG; 206 tp->t_cflag = TTYDEF_CFLAG | CLOCAL; 207 tp->t_lflag = TTYDEF_LFLAG; 208 tp->t_ispeed = tp->t_ospeed = 115200; 209 ttsetwater(tp); 210 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, 211 tp) != 0) { 212 splx(s); 213 return (EBUSY); 214 } 215 216 splx(s); 217 218 error = (*tp->t_linesw->l_open)(dev, tp); 219 220 return (error); 221 } 222 223 int 224 uart_close(dev_t dev, int flag, int mode, struct lwp *l) 225 { 226 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 227 struct tty *tp = sc->sc_tty; 228 229 (*tp->t_linesw->l_close)(tp, flag); 230 ttyclose(tp); 231 return (0); 232 } 233 234 235 int 236 uart_read(dev_t dev, struct uio *uio, int flag) 237 { 238 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 239 struct tty *tp = sc->sc_tty; 240 241 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 242 } 243 244 int 245 uart_write(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_write)(tp, uio, flag)); 251 } 252 253 int 254 uart_poll(dev_t dev, int events, struct lwp *l) 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_poll)(tp, events, l)); 260 } 261 262 int 263 uart_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 264 { 265 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 266 struct tty *tp = sc->sc_tty; 267 int error; 268 269 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 270 if (error != EPASSTHROUGH) 271 return (error); 272 return (ttioctl(tp, cmd, data, flag, l)); 273 } 274 275 int 276 uart_param(struct tty *tp, struct termios *t) 277 { 278 279 return (0); 280 } 281 282 struct tty* 283 uart_tty(dev_t dev) 284 { 285 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev)); 286 287 return sc->sc_tty; 288 } 289 290 291 void 292 uart_start(struct tty *tp) 293 { 294 int s,i,cnt; 295 296 s = spltty(); 297 if (tp->t_state & (TS_TTSTOP | TS_BUSY)) 298 goto out; 299 ttypull(tp); 300 tp->t_state |= TS_BUSY; 301 while (tp->t_outq.c_cc != 0) { 302 cnt = ndqb(&tp->t_outq, 0); 303 for (i=0; i<cnt; i++) 304 uart_cnputc(0,tp->t_outq.c_cf[i]); 305 ndflush(&tp->t_outq, cnt); 306 } 307 tp->t_state &= ~TS_BUSY; 308 out: 309 splx(s); 310 } 311 312 void 313 uart_stop(struct tty *tp, int flag) 314 { 315 int s; 316 317 s = spltty(); 318 if (tp->t_state & TS_BUSY) 319 if ((tp->t_state & TS_TTSTOP) == 0) 320 tp->t_state |= TS_FLUSH; 321 splx(s); 322 } 323 324 int 325 uart_intr(void *v) 326 { 327 struct uart_softc *sc = v; 328 struct tty *tp = sc->sc_tty; 329 int c, l_r; 330 331 if (REG_READ(UART_RSR_REG) & UART_RSR_BE) { 332 REG_WRITE(UART_ECR_REG, UART_ECR_RSR); 333 console_debugger(); 334 } 335 336 while ((REG_READ(UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) == 0) { 337 c = REG_READ(UART_DR_REG) & 0xff; 338 if (tp->t_state & TS_ISOPEN) 339 l_r = (*tp->t_linesw->l_rint)(c, tp); 340 } 341 return 0; 342 } 343