The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/am79c930.c

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    1 /* $NetBSD: am79c930.c,v 1.13 2005/02/27 00:27:00 perry Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Bill Sommerfeld
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *        This product includes software developed by the NetBSD
   21  *        Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 /*
   40  * Am79c930 chip driver.
   41  *
   42  * This is used by the awi driver to use the shared
   43  * memory attached to the 79c930 to communicate with the firmware running
   44  * in the 930's on-board 80188 core.
   45  *
   46  * The 79c930 can be mapped into just I/O space, or also have a
   47  * memory mapping; the mapping must be set up by the bus front-end
   48  * before am79c930_init is called.
   49  */
   50 
   51 /*
   52  * operations:
   53  *
   54  * read_8, read_16, read_32, read_64, read_bytes
   55  * write_8, write_16, write_32, write_64, write_bytes
   56  * (two versions, depending on whether memory-space or i/o space is in use).
   57  *
   58  * interrupt E.C.
   59  * start isr
   60  * end isr
   61  */
   62 
   63 #include <sys/cdefs.h>
   64 #ifdef __NetBSD__
   65 __KERNEL_RCSID(0, "$NetBSD: am79c930.c,v 1.13 2005/02/27 00:27:00 perry Exp $");
   66 #endif
   67 #ifdef __FreeBSD__
   68 __FBSDID("$FreeBSD$");
   69 #endif
   70 
   71 #include <sys/param.h>
   72 #include <sys/systm.h>
   73 #include <sys/endian.h>
   74 #ifndef __FreeBSD__
   75 #include <sys/device.h>
   76 #endif
   77 
   78 #include <machine/cpu.h>
   79 #ifdef __FreeBSD__
   80 #include <machine/bus_pio.h>
   81 #include <machine/bus_memio.h>
   82 #endif
   83 #include <machine/bus.h>
   84 #ifdef __NetBSD__
   85 #include <machine/intr.h>
   86 #endif
   87 
   88 #ifdef __NetBSD__
   89 #include <dev/ic/am79c930reg.h>
   90 #include <dev/ic/am79c930var.h>
   91 #endif
   92 #ifdef __FreeBSD__
   93 #include <dev/awi/am79c930reg.h>
   94 #include <dev/awi/am79c930var.h>
   95 #endif
   96 
   97 #define AM930_DELAY(x) /*nothing*/
   98 
   99 #ifndef __BUS_SPACE_HAS_STREAM_METHODS
  100 #define bus_space_read_stream_2         bus_space_read_2
  101 #define bus_space_read_stream_4         bus_space_read_4
  102 #define bus_space_write_stream_2        bus_space_write_2
  103 #define bus_space_write_stream_4        bus_space_write_4
  104 #endif /* __BUS_SPACE_HAS_STREAM_METHODS */
  105 
  106 void am79c930_regdump(struct am79c930_softc *sc);
  107 
  108 static void io_write_1(struct am79c930_softc *, u_int32_t, u_int8_t);
  109 static void io_write_2(struct am79c930_softc *, u_int32_t, u_int16_t);
  110 static void io_write_4(struct am79c930_softc *, u_int32_t, u_int32_t);
  111 static void io_write_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);
  112 
  113 static u_int8_t io_read_1(struct am79c930_softc *, u_int32_t);
  114 static u_int16_t io_read_2(struct am79c930_softc *, u_int32_t);
  115 static u_int32_t io_read_4(struct am79c930_softc *, u_int32_t);
  116 static void io_read_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);
  117 
  118 static void mem_write_1(struct am79c930_softc *, u_int32_t, u_int8_t);
  119 static void mem_write_2(struct am79c930_softc *, u_int32_t, u_int16_t);
  120 static void mem_write_4(struct am79c930_softc *, u_int32_t, u_int32_t);
  121 static void mem_write_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);
  122 
  123 static u_int8_t mem_read_1(struct am79c930_softc *, u_int32_t);
  124 static u_int16_t mem_read_2(struct am79c930_softc *, u_int32_t);
  125 static u_int32_t mem_read_4(struct am79c930_softc *, u_int32_t);
  126 static void mem_read_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);
  127 
  128 static struct am79c930_ops iospace_ops = {
  129         io_write_1,
  130         io_write_2,
  131         io_write_4,
  132         io_write_bytes,
  133         io_read_1,
  134         io_read_2,
  135         io_read_4,
  136         io_read_bytes
  137 };
  138 
  139 struct am79c930_ops memspace_ops = {
  140         mem_write_1,
  141         mem_write_2,
  142         mem_write_4,
  143         mem_write_bytes,
  144         mem_read_1,
  145         mem_read_2,
  146         mem_read_4,
  147         mem_read_bytes
  148 };
  149 
  150 static void
  151 io_write_1( struct am79c930_softc *sc, u_int32_t off, u_int8_t val)
  152 {
  153         AM930_DELAY(1);
  154         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  155             ((off>>8)& 0x7f));
  156         AM930_DELAY(1);
  157         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
  158         AM930_DELAY(1);
  159         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA, val);
  160         AM930_DELAY(1);
  161 }
  162 
  163 static void
  164 io_write_2(struct am79c930_softc *sc, u_int32_t off, u_int16_t val)
  165 {
  166         AM930_DELAY(1);
  167         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  168             ((off>>8)& 0x7f));
  169         AM930_DELAY(1);
  170         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_LMA_LO, (off&0xff));
  171         AM930_DELAY(1);
  172         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA, val & 0xff);
  173         AM930_DELAY(1);
  174         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA, (val>>8)&0xff);
  175         AM930_DELAY(1);
  176 }
  177 
  178 static void
  179 io_write_4(struct am79c930_softc *sc, u_int32_t off, u_int32_t val)
  180 {
  181         AM930_DELAY(1);
  182         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  183             ((off>>8)& 0x7f));
  184         AM930_DELAY(1);
  185         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_LMA_LO, (off&0xff));
  186         AM930_DELAY(1);
  187         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,val & 0xff);
  188         AM930_DELAY(1);
  189         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,(val>>8)&0xff);
  190         AM930_DELAY(1);
  191         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,(val>>16)&0xff);
  192         AM930_DELAY(1);
  193         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,(val>>24)&0xff);
  194         AM930_DELAY(1);
  195 }
  196 
  197 static void
  198 io_write_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
  199     size_t len)
  200 {
  201         int i;
  202 
  203         AM930_DELAY(1);
  204         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  205             ((off>>8)& 0x7f));
  206         AM930_DELAY(1);
  207         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_LMA_LO, (off&0xff));
  208         AM930_DELAY(1);
  209         for (i=0; i<len; i++)
  210                 bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,ptr[i]);
  211 }
  212 
  213 static u_int8_t
  214 io_read_1(struct am79c930_softc *sc, u_int32_t off)
  215 {
  216         u_int8_t val;
  217 
  218         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  219             ((off>>8)& 0x7f));
  220         AM930_DELAY(1);
  221         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
  222         AM930_DELAY(1);
  223         val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA);
  224         AM930_DELAY(1);
  225         return val;
  226 }
  227 
  228 static u_int16_t
  229 io_read_2(struct am79c930_softc *sc, u_int32_t off)
  230 {
  231         u_int16_t val;
  232 
  233         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  234             ((off>>8)& 0x7f));
  235         AM930_DELAY(1);
  236         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
  237         AM930_DELAY(1);
  238         val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA);
  239         AM930_DELAY(1);
  240         val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 8;
  241         AM930_DELAY(1);
  242         return val;
  243 }
  244 
  245 static u_int32_t
  246 io_read_4(struct am79c930_softc *sc, u_int32_t off)
  247 {
  248         u_int32_t val;
  249 
  250         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  251             ((off>>8)& 0x7f));
  252         AM930_DELAY(1);
  253         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
  254         AM930_DELAY(1);
  255         val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA);
  256         AM930_DELAY(1);
  257         val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 8;
  258         AM930_DELAY(1);
  259         val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 16;
  260         AM930_DELAY(1);
  261         val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 24;
  262         AM930_DELAY(1);
  263         return val;
  264 }
  265 
  266 static void
  267 io_read_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
  268     size_t len)
  269 {
  270         int i;
  271 
  272         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  273             ((off>>8)& 0x7f));
  274         AM930_DELAY(1);
  275         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
  276         AM930_DELAY(1);
  277         for (i=0; i<len; i++)
  278                 ptr[i] = bus_space_read_1(sc->sc_iot, sc->sc_ioh,
  279                     AM79C930_IODPA);
  280 }
  281 
  282 static void
  283 mem_write_1(struct am79c930_softc *sc, u_int32_t off, u_int8_t val)
  284 {
  285         bus_space_write_1(sc->sc_memt, sc->sc_memh, off, val);
  286 }
  287 
  288 static void
  289 mem_write_2(struct am79c930_softc *sc, u_int32_t off, u_int16_t val)
  290 {
  291         bus_space_tag_t t = sc->sc_memt;
  292         bus_space_handle_t h = sc->sc_memh;
  293 
  294         /* could be unaligned */
  295         if ((off & 0x1) == 0)
  296                 bus_space_write_stream_2(t, h, off,    htole16(val));
  297         else {
  298                 bus_space_write_1(t, h, off,    val        & 0xff);
  299                 bus_space_write_1(t, h, off+1, (val >>  8) & 0xff);
  300         }
  301 }
  302 
  303 static void
  304 mem_write_4(struct am79c930_softc *sc, u_int32_t off, u_int32_t val)
  305 {
  306         bus_space_tag_t t = sc->sc_memt;
  307         bus_space_handle_t h = sc->sc_memh;
  308 
  309         /* could be unaligned */
  310         if ((off & 0x3) == 0)
  311                 bus_space_write_stream_4(t, h, off,    htole32(val));
  312         else {
  313                 bus_space_write_1(t, h, off,    val        & 0xff);
  314                 bus_space_write_1(t, h, off+1, (val >>  8) & 0xff);
  315                 bus_space_write_1(t, h, off+2, (val >> 16) & 0xff);
  316                 bus_space_write_1(t, h, off+3, (val >> 24) & 0xff);
  317         }
  318 }
  319 
  320 static void
  321 mem_write_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
  322     size_t len)
  323 {
  324         bus_space_write_region_1 (sc->sc_memt, sc->sc_memh, off, ptr, len);
  325 }
  326 
  327 static u_int8_t
  328 mem_read_1(struct am79c930_softc *sc, u_int32_t off)
  329 {
  330         return bus_space_read_1(sc->sc_memt, sc->sc_memh, off);
  331 }
  332 
  333 static u_int16_t
  334 mem_read_2(struct am79c930_softc *sc, u_int32_t off)
  335 {
  336         /* could be unaligned */
  337         if ((off & 0x1) == 0)
  338                 return le16toh(bus_space_read_stream_2(sc->sc_memt,
  339                     sc->sc_memh, off));
  340         else
  341                 return
  342                      bus_space_read_1(sc->sc_memt, sc->sc_memh, off  )       |
  343                     (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+1) << 8);
  344 }
  345 
  346 static u_int32_t
  347 mem_read_4(struct am79c930_softc *sc, u_int32_t off)
  348 {
  349         /* could be unaligned */
  350         if ((off & 0x3) == 0)
  351                 return le32toh(bus_space_read_stream_4(sc->sc_memt, sc->sc_memh,
  352                     off));
  353         else
  354                 return
  355                      bus_space_read_1(sc->sc_memt, sc->sc_memh, off  )       |
  356                     (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+1) << 8) |
  357                     (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+2) <<16) |
  358                     (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+3) <<24);
  359 }
  360 
  361 static void
  362 mem_read_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
  363     size_t len)
  364 {
  365         bus_space_read_region_1 (sc->sc_memt, sc->sc_memh, off, ptr, len);
  366 }
  367 
  368 
  369 /*
  370  * Set bits in GCR.
  371  */
  372 
  373 void
  374 am79c930_gcr_setbits(struct am79c930_softc *sc, u_int8_t bits)
  375 {
  376         u_int8_t gcr = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);
  377 
  378         gcr |= bits;
  379 
  380         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_GCR, gcr);
  381 }
  382 
  383 /*
  384  * Clear bits in GCR.
  385  */
  386 
  387 void
  388 am79c930_gcr_clearbits(struct am79c930_softc *sc, u_int8_t bits)
  389 {
  390         u_int8_t gcr = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);
  391 
  392         gcr &= ~bits;
  393 
  394         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_GCR, gcr);
  395 }
  396 
  397 u_int8_t
  398 am79c930_gcr_read(struct am79c930_softc *sc)
  399 {
  400         return bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);
  401 }
  402 
  403 #if 0
  404 void
  405 am79c930_regdump(struct am79c930_softc *sc)
  406 {
  407         u_int8_t buf[8];
  408         int i;
  409 
  410         AM930_DELAY(5);
  411         for (i=0; i<8; i++) {
  412                 buf[i] = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, i);
  413                 AM930_DELAY(5);
  414         }
  415         printf("am79c930: regdump:");
  416         for (i=0; i<8; i++) {
  417                 printf(" %02x", buf[i]);
  418         }
  419         printf("\n");
  420 }
  421 #endif
  422 
  423 void
  424 am79c930_chip_init(struct am79c930_softc *sc, int how)
  425 {
  426         /* zero the bank select register, and leave it that way.. */
  427         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_BSS, 0);
  428         if (how)
  429                 sc->sc_ops = &memspace_ops;
  430         else
  431                 sc->sc_ops = &iospace_ops;
  432 }

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