sys/arch/mips/adm5120/dev/uart.c

   1 /* $NetBSD: uart.c,v 1.5 2008/06/11 23:55:20 cegger 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 1.5 2008/06/11 23:55:20 cegger 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 = ttymalloc();
 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 }