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

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    1 /* $NetBSD: am79c930.c,v 1.9 2004/01/15 09:33:48 onoe 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 1.9 2004/01/15 09:33:48 onoe Exp $");
   66 #endif
   67 #ifdef __FreeBSD__
   68 __FBSDID("$FreeBSD: releng/5.4/sys/dev/awi/am79c930.c 124546 2004-01-15 10:04:21Z onoe $");
   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 void am79c930_regdump(struct am79c930_softc *sc);
  100 
  101 static void io_write_1(struct am79c930_softc *, u_int32_t, u_int8_t);
  102 static void io_write_2(struct am79c930_softc *, u_int32_t, u_int16_t);
  103 static void io_write_4(struct am79c930_softc *, u_int32_t, u_int32_t);
  104 static void io_write_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);
  105 
  106 static u_int8_t io_read_1(struct am79c930_softc *, u_int32_t);
  107 static u_int16_t io_read_2(struct am79c930_softc *, u_int32_t);
  108 static u_int32_t io_read_4(struct am79c930_softc *, u_int32_t);
  109 static void io_read_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);
  110 
  111 static void mem_write_1(struct am79c930_softc *, u_int32_t, u_int8_t);
  112 static void mem_write_2(struct am79c930_softc *, u_int32_t, u_int16_t);
  113 static void mem_write_4(struct am79c930_softc *, u_int32_t, u_int32_t);
  114 static void mem_write_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);
  115 
  116 static u_int8_t mem_read_1(struct am79c930_softc *, u_int32_t);
  117 static u_int16_t mem_read_2(struct am79c930_softc *, u_int32_t);
  118 static u_int32_t mem_read_4(struct am79c930_softc *, u_int32_t);
  119 static void mem_read_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);
  120 
  121 static struct am79c930_ops iospace_ops = {
  122         io_write_1,
  123         io_write_2,
  124         io_write_4,
  125         io_write_bytes,
  126         io_read_1,
  127         io_read_2,
  128         io_read_4,
  129         io_read_bytes
  130 };
  131 
  132 struct am79c930_ops memspace_ops = {
  133         mem_write_1,
  134         mem_write_2,
  135         mem_write_4,
  136         mem_write_bytes,
  137         mem_read_1,
  138         mem_read_2,
  139         mem_read_4,
  140         mem_read_bytes
  141 };
  142 
  143 static void
  144 io_write_1( struct am79c930_softc *sc, u_int32_t off, u_int8_t val)
  145 {
  146         AM930_DELAY(1);
  147         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  148             ((off>>8)& 0x7f));
  149         AM930_DELAY(1);
  150         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
  151         AM930_DELAY(1);
  152         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA, val);
  153         AM930_DELAY(1);
  154 }
  155 
  156 static void
  157 io_write_2(struct am79c930_softc *sc, u_int32_t off, u_int16_t val)
  158 {
  159         AM930_DELAY(1);
  160         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  161             ((off>>8)& 0x7f));
  162         AM930_DELAY(1);
  163         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_LMA_LO, (off&0xff));
  164         AM930_DELAY(1);
  165         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA, val & 0xff);
  166         AM930_DELAY(1);
  167         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA, (val>>8)&0xff);
  168         AM930_DELAY(1);
  169 }
  170 
  171 static void
  172 io_write_4(struct am79c930_softc *sc, u_int32_t off, u_int32_t val)
  173 {
  174         AM930_DELAY(1);
  175         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  176             ((off>>8)& 0x7f));
  177         AM930_DELAY(1);
  178         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_LMA_LO, (off&0xff));
  179         AM930_DELAY(1);
  180         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,val & 0xff);
  181         AM930_DELAY(1);
  182         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,(val>>8)&0xff);
  183         AM930_DELAY(1);
  184         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,(val>>16)&0xff);
  185         AM930_DELAY(1);
  186         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,(val>>24)&0xff);
  187         AM930_DELAY(1);
  188 }
  189 
  190 static void
  191 io_write_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
  192     size_t len)
  193 {
  194         int i;
  195 
  196         AM930_DELAY(1);
  197         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  198             ((off>>8)& 0x7f));
  199         AM930_DELAY(1);
  200         bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_LMA_LO, (off&0xff));
  201         AM930_DELAY(1);
  202         for (i=0; i<len; i++)
  203                 bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,ptr[i]);
  204 }
  205 
  206 static u_int8_t
  207 io_read_1(struct am79c930_softc *sc, u_int32_t off)
  208 {
  209         u_int8_t val;
  210 
  211         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  212             ((off>>8)& 0x7f));
  213         AM930_DELAY(1);
  214         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
  215         AM930_DELAY(1);
  216         val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA);
  217         AM930_DELAY(1);
  218         return val;
  219 }
  220 
  221 static u_int16_t
  222 io_read_2(struct am79c930_softc *sc, u_int32_t off)
  223 {
  224         u_int16_t val;
  225 
  226         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  227             ((off>>8)& 0x7f));
  228         AM930_DELAY(1);
  229         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
  230         AM930_DELAY(1);
  231         val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA);
  232         AM930_DELAY(1);
  233         val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 8;
  234         AM930_DELAY(1); 
  235         return val;
  236 }
  237 
  238 static u_int32_t
  239 io_read_4(struct am79c930_softc *sc, u_int32_t off)
  240 {
  241         u_int32_t val;
  242 
  243         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  244             ((off>>8)& 0x7f));
  245         AM930_DELAY(1);
  246         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
  247         AM930_DELAY(1);
  248         val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA);
  249         AM930_DELAY(1);
  250         val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 8;
  251         AM930_DELAY(1); 
  252         val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 16;
  253         AM930_DELAY(1); 
  254         val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 24;
  255         AM930_DELAY(1); 
  256         return val;
  257 }
  258 
  259 static void
  260 io_read_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
  261     size_t len)
  262 {
  263         int i;
  264         
  265         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
  266             ((off>>8)& 0x7f));
  267         AM930_DELAY(1);
  268         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
  269         AM930_DELAY(1);
  270         for (i=0; i<len; i++) 
  271                 ptr[i] = bus_space_read_1(sc->sc_iot, sc->sc_ioh,
  272                     AM79C930_IODPA);
  273 }
  274 
  275 static void
  276 mem_write_1(struct am79c930_softc *sc, u_int32_t off, u_int8_t val)
  277 {
  278         bus_space_write_1(sc->sc_memt, sc->sc_memh, off, val);
  279 }
  280 
  281 static
  282 void mem_write_2(struct am79c930_softc *sc, u_int32_t off, u_int16_t val)
  283 {
  284         bus_space_tag_t t = sc->sc_memt;
  285         bus_space_handle_t h = sc->sc_memh;
  286 
  287         /* could be unaligned */
  288         if ((off & 0x1) == 0)
  289                 bus_space_write_2(t, h, off,    htole16(val));
  290         else {
  291                 bus_space_write_1(t, h, off,    val        & 0xff);
  292                 bus_space_write_1(t, h, off+1, (val >>  8) & 0xff);
  293         }
  294 }
  295 
  296 static void
  297 mem_write_4(struct am79c930_softc *sc, u_int32_t off, u_int32_t val)
  298 {
  299         bus_space_tag_t t = sc->sc_memt;
  300         bus_space_handle_t h = sc->sc_memh;
  301 
  302         /* could be unaligned */
  303         if ((off & 0x3) == 0)
  304                 bus_space_write_4(t, h, off,    htole32(val));
  305         else {
  306                 bus_space_write_1(t, h, off,    val        & 0xff);
  307                 bus_space_write_1(t, h, off+1, (val >>  8) & 0xff);
  308                 bus_space_write_1(t, h, off+2, (val >> 16) & 0xff);
  309                 bus_space_write_1(t, h, off+3, (val >> 24) & 0xff);
  310         }
  311 }
  312 
  313 static void
  314 mem_write_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
  315     size_t len)
  316 {
  317         bus_space_write_region_1 (sc->sc_memt, sc->sc_memh, off, ptr, len);
  318 }
  319 
  320 static u_int8_t
  321 mem_read_1(struct am79c930_softc *sc, u_int32_t off)
  322 {
  323         return bus_space_read_1(sc->sc_memt, sc->sc_memh, off);
  324 }
  325 
  326 static u_int16_t
  327 mem_read_2(struct am79c930_softc *sc, u_int32_t off)
  328 {
  329         /* could be unaligned */
  330         if ((off & 0x1) == 0)
  331                 return le16toh(bus_space_read_2(sc->sc_memt, sc->sc_memh, off));
  332         else
  333                 return
  334                      bus_space_read_1(sc->sc_memt, sc->sc_memh, off  )       |
  335                     (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+1) << 8);
  336 }
  337 
  338 static u_int32_t
  339 mem_read_4(struct am79c930_softc *sc, u_int32_t off)
  340 {
  341         /* could be unaligned */
  342         if ((off & 0x3) == 0)
  343                 return le32toh(bus_space_read_4(sc->sc_memt, sc->sc_memh, off));
  344         else
  345                 return
  346                      bus_space_read_1(sc->sc_memt, sc->sc_memh, off  )       |
  347                     (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+1) << 8) |
  348                     (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+2) <<16) |
  349                     (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+3) <<24);
  350 }
  351 
  352 static void
  353 mem_read_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
  354     size_t len)
  355 {
  356         bus_space_read_region_1 (sc->sc_memt, sc->sc_memh, off, ptr, len);
  357 }
  358 
  359 
  360 /*
  361  * Set bits in GCR.
  362  */
  363 
  364 void
  365 am79c930_gcr_setbits(struct am79c930_softc *sc, u_int8_t bits)
  366 {
  367         u_int8_t gcr = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);
  368 
  369         gcr |= bits;
  370         
  371         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_GCR, gcr);
  372 }
  373 
  374 /*
  375  * Clear bits in GCR.
  376  */
  377 
  378 void
  379 am79c930_gcr_clearbits(struct am79c930_softc *sc, u_int8_t bits)
  380 {
  381         u_int8_t gcr = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);
  382 
  383         gcr &= ~bits;
  384         
  385         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_GCR, gcr);
  386 }
  387 
  388 u_int8_t
  389 am79c930_gcr_read(struct am79c930_softc *sc)
  390 {
  391         return bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);
  392 }
  393 
  394 #if 0 
  395 void
  396 am79c930_regdump(struct am79c930_softc *sc)
  397 {
  398         u_int8_t buf[8];
  399         int i;
  400 
  401         AM930_DELAY(5);
  402         for (i=0; i<8; i++) {
  403                 buf[i] = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, i);
  404                 AM930_DELAY(5);
  405         }
  406         printf("am79c930: regdump:");
  407         for (i=0; i<8; i++) {
  408                 printf(" %02x", buf[i]);
  409         }
  410         printf("\n");
  411 }
  412 #endif
  413 
  414 void
  415 am79c930_chip_init(struct am79c930_softc *sc, int how)
  416 {
  417         /* zero the bank select register, and leave it that way.. */
  418         bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_BSS, 0);
  419         if (how)
  420                 sc->sc_ops = &memspace_ops;
  421         else
  422                 sc->sc_ops = &iospace_ops;
  423 }

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