The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/sa11x0/uart_dev_sa1110.c

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    1 /*-
    2  * Copyright (c) 2003 Marcel Moolenaar
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/7.3/sys/arm/sa11x0/uart_dev_sa1110.c 172152 2007-09-12 18:28:09Z cognet $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/conf.h>
   34 #include <sys/cons.h>
   35 #include <sys/tty.h>
   36 #include <machine/bus.h>
   37 
   38 #include <dev/uart/uart.h>
   39 #include <dev/uart/uart_cpu.h>
   40 #include <dev/uart/uart_bus.h>
   41 #include <arm/sa11x0/sa11x0_reg.h>
   42 #include <arm/sa11x0/uart_dev_sa1110.h>
   43 
   44 #include "uart_if.h"
   45 
   46 #define      DEFAULT_RCLK    3686400
   47 
   48 /*
   49  * Low-level UART interface.
   50  */
   51 static int sa1110_probe(struct uart_bas *bas);
   52 static void sa1110_init(struct uart_bas *bas, int, int, int, int);
   53 static void sa1110_term(struct uart_bas *bas);
   54 static void sa1110_putc(struct uart_bas *bas, int);
   55 static int sa1110_rxready(struct uart_bas *bas);
   56 static int sa1110_getc(struct uart_bas *bas, struct mtx *mtx);
   57 
   58 extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
   59 
   60 static struct uart_ops uart_sa1110_ops = {
   61         .probe = sa1110_probe,
   62         .init = sa1110_init,
   63         .term = sa1110_term,
   64         .putc = sa1110_putc,
   65         .rxready = sa1110_rxready,
   66         .getc = sa1110_getc,
   67 };
   68 
   69 static int
   70 sa1110_probe(struct uart_bas *bas)
   71 {
   72         return (0);
   73 }
   74 
   75 static void
   76 sa1110_init(struct uart_bas *bas, int baudrate, int databits, int stopbits,
   77     int parity)
   78 {
   79         int brd;
   80         
   81         if (bas->rclk == 0)
   82                 bas->rclk = DEFAULT_RCLK;
   83         while (uart_getreg(bas, SACOM_SR1) & SR1_TBY);
   84         uart_setreg(bas, SACOM_CR3, 0);
   85         brd = SACOMSPEED(baudrate);
   86         uart_setreg(bas, SACOM_CR1, brd >> 8);
   87         uart_setreg(bas, SACOM_CR2, brd & 0xff);
   88         uart_setreg(bas, SACOM_CR3, CR3_RXE | CR3_TXE);
   89 }
   90 
   91 static void
   92 sa1110_term(struct uart_bas *bas)
   93 {
   94         /* XXX */
   95 }
   96 
   97 static void
   98 sa1110_putc(struct uart_bas *bas, int c)
   99 {
  100         while (!(uart_getreg(bas, SACOM_SR1) & SR1_TNF));
  101         uart_setreg(bas, SACOM_DR, c);
  102 }
  103 
  104 static int
  105 sa1110_rxready(struct uart_bas *bas)
  106 {
  107 
  108         return ((uart_getreg(bas, SACOM_SR1) & SR1_RNE) != 0 ? 1 : 0);
  109 }
  110 
  111 static int
  112 sa1110_getc(struct uart_bas *bas, struct mtx *mtx)
  113 {
  114         int c;
  115 
  116         while (!(uart_getreg(bas, SACOM_SR1) & SR1_RNE)) {
  117                 u_int32_t sr0;
  118 
  119                 sr0 = uart_getreg(bas, SACOM_SR0);
  120                 if (ISSET(sr0, SR0_RBB))
  121                         uart_setreg(bas, SACOM_SR0, SR0_RBB);
  122                 if (ISSET(sr0, SR0_REB))
  123                         uart_setreg(bas, SACOM_SR0, SR0_REB);
  124         }
  125         c = uart_getreg(bas, SACOM_DR);
  126         c &= 0xff;
  127         return (c);
  128 }
  129 
  130 static int sa1110_bus_probe(struct uart_softc *sc);
  131 static int sa1110_bus_attach(struct uart_softc *sc);
  132 static int sa1110_bus_flush(struct uart_softc *, int);
  133 static int sa1110_bus_getsig(struct uart_softc *);
  134 static int sa1110_bus_ioctl(struct uart_softc *, int, intptr_t);
  135 static int sa1110_bus_ipend(struct uart_softc *);
  136 static int sa1110_bus_param(struct uart_softc *, int, int, int, int);
  137 static int sa1110_bus_receive(struct uart_softc *);
  138 static int sa1110_bus_setsig(struct uart_softc *, int);
  139 static int sa1110_bus_transmit(struct uart_softc *);
  140 
  141 static kobj_method_t sa1110_methods[] = {
  142         KOBJMETHOD(uart_probe,          sa1110_bus_probe),
  143         KOBJMETHOD(uart_attach,         sa1110_bus_attach),
  144         KOBJMETHOD(uart_flush,          sa1110_bus_flush),
  145         KOBJMETHOD(uart_getsig,         sa1110_bus_getsig),
  146         KOBJMETHOD(uart_ioctl,          sa1110_bus_ioctl),
  147         KOBJMETHOD(uart_ipend,          sa1110_bus_ipend),
  148         KOBJMETHOD(uart_param,          sa1110_bus_param),
  149         KOBJMETHOD(uart_receive,        sa1110_bus_receive),
  150         KOBJMETHOD(uart_setsig,         sa1110_bus_setsig),
  151         KOBJMETHOD(uart_transmit,       sa1110_bus_transmit),
  152         
  153         {0, 0 }
  154 };
  155 
  156 int
  157 sa1110_bus_probe(struct uart_softc *sc)
  158 {
  159         return (0);
  160 }
  161 
  162 static int
  163 sa1110_bus_attach(struct uart_softc *sc)
  164 {
  165          bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
  166 
  167          sc->sc_txfifosz = 3;
  168          sc->sc_rxfifosz = 1;
  169          sc->sc_hwiflow = 0;
  170          uart_setreg(&sc->sc_bas, SACOM_CR3, CR3_RXE | CR3_TXE | CR3_RIE | CR3_TIE);
  171         return (0);
  172 }
  173 static int
  174 sa1110_bus_transmit(struct uart_softc *sc)
  175 {
  176         int i;
  177 #if 0
  178         int sr = uart_getreg(&sc->sc_bas, SACOM_SR0);
  179 
  180         while (!(uart_getreg(&sc->sc_bas, SACOM_CR3) & CR3_TIE))
  181                 uart_setreg(&sc->sc_bas, SACOM_CR3,
  182                     uart_getreg(&sc->sc_bas, SACOM_CR3) | CR3_TIE);    
  183 #endif
  184 
  185         sc->sc_txbusy = 1;
  186         uart_setreg(&sc->sc_bas, SACOM_CR3, uart_getreg(&sc->sc_bas, SACOM_CR3)
  187             | CR3_TIE);    
  188         for (i = 0; i < sc->sc_txdatasz; i++) {
  189                 while (!(uart_getreg(&sc->sc_bas, SACOM_SR1) & SR1_TNF));
  190 
  191                 uart_setreg(&sc->sc_bas, SACOM_DR, sc->sc_txbuf[i]);
  192                 uart_barrier(&sc->sc_bas);
  193         }
  194 #if 0
  195         sr = uart_getreg(&sc->sc_bas, SACOM_SR0);
  196 #endif
  197 
  198         return (0);
  199 }
  200 static int
  201 sa1110_bus_setsig(struct uart_softc *sc, int sig)
  202 {
  203         return (0);
  204 }
  205 static int
  206 sa1110_bus_receive(struct uart_softc *sc)
  207 {
  208         
  209 #if 0
  210         while (!(uart_getreg(&sc->sc_bas, SACOM_SR1) & SR1_RNE)) {
  211                 u_int32_t sr0;
  212 
  213                 sr0 = uart_getreg(&sc->sc_bas, SACOM_SR0);
  214                 if (ISSET(sr0, SR0_RBB))
  215                         uart_setreg(&sc->sc_bas, SACOM_SR0, SR0_RBB);
  216                 if (ISSET(sr0, SR0_REB))
  217                         uart_setreg(&sc->sc_bas, SACOM_SR0, SR0_REB);
  218         }
  219 #endif
  220         
  221         uart_setreg(&sc->sc_bas, SACOM_CR3, uart_getreg(&sc->sc_bas, SACOM_CR3)
  222             | CR3_RIE);
  223         uart_rx_put(sc, uart_getreg(&sc->sc_bas, SACOM_DR));
  224         return (0);
  225 }
  226 static int
  227 sa1110_bus_param(struct uart_softc *sc, int baudrate, int databits,
  228     int stopbits, int parity)
  229 {
  230         int brd;
  231         
  232         if (baudrate > 0) {
  233                 brd = SACOMSPEED(baudrate);
  234                 uart_setreg(&sc->sc_bas, SACOM_CR1, brd >> 8);
  235                 uart_setreg(&sc->sc_bas, SACOM_CR2, brd & 0xff);
  236         }
  237         return (0);
  238 }
  239 static int
  240 sa1110_bus_ipend(struct uart_softc *sc)
  241 {
  242         int sr = uart_getreg(&sc->sc_bas, SACOM_SR0);
  243         int ipend = 0;
  244         int mask = CR3_RIE | CR3_TIE;
  245         if (sr & 1) {
  246                 if (uart_getreg(&sc->sc_bas, SACOM_CR3) & CR3_TIE)
  247                         ipend |= SER_INT_TXIDLE;
  248                 mask &= ~CR3_TIE;
  249         }
  250         if (sr & 4) {
  251                 if (uart_getreg(&sc->sc_bas, SACOM_CR3) & CR3_RIE)
  252                         ipend |= SER_INT_RXREADY;
  253                 mask &= ~CR3_RIE;
  254         }
  255         uart_setreg(&sc->sc_bas, SACOM_CR3, CR3_RXE | mask); 
  256         return (ipend);
  257 }
  258 static int
  259 sa1110_bus_flush(struct uart_softc *sc, int what)
  260 {
  261         return (0);
  262 }
  263 
  264 static int
  265 sa1110_bus_getsig(struct uart_softc *sc)
  266 {
  267         return (0);
  268 }
  269 
  270 static int
  271 sa1110_bus_ioctl(struct uart_softc *sc, int request, intptr_t data)
  272 {
  273         return (EINVAL);
  274 }
  275 
  276 struct uart_class uart_sa1110_class = {
  277         "sa1110",
  278         sa1110_methods,
  279         1,
  280         .uc_ops = &uart_sa1110_ops,
  281         .uc_range = 8,
  282         .uc_rclk = 3686400
  283 };

Cache object: 42894f5e64bb0aa6d21d6a2b8f15ff2c


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