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/xscale/pxa/pxa_smi.c

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    1 /*-
    2  * Copyright (c) 2006 Benno Rice.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   23  */
   24 
   25 #include <sys/cdefs.h>
   26 __FBSDID("$FreeBSD: releng/10.3/sys/arm/xscale/pxa/pxa_smi.c 241885 2012-10-22 13:06:09Z eadler $");
   27 
   28 #include <sys/param.h>
   29 #include <sys/systm.h>
   30 #include <sys/bus.h>
   31 #include <sys/kernel.h>
   32 #include <sys/module.h>
   33 #include <sys/malloc.h>
   34 #include <sys/rman.h>
   35 #include <sys/timetc.h>
   36 #include <machine/bus.h>
   37 #include <machine/intr.h>
   38 
   39 #include <vm/vm.h>
   40 #include <vm/pmap.h>
   41 
   42 #include <arm/xscale/pxa/pxavar.h>
   43 #include <arm/xscale/pxa/pxareg.h>
   44 
   45 static MALLOC_DEFINE(M_PXASMI, "PXA SMI",
   46     "Data for static memory interface devices.");
   47 
   48 struct pxa_smi_softc {
   49         struct resource *ps_res[1];
   50         struct rman     ps_mem;
   51         bus_space_tag_t ps_bst;
   52         bus_addr_t      ps_base;
   53 };
   54 
   55 struct smi_ivars {
   56         struct resource_list    smid_resources;
   57         bus_addr_t              smid_mem;
   58 };
   59 
   60 static struct resource_spec pxa_smi_spec[] = {
   61         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
   62         { -1, 0 }
   63 };
   64 
   65 static int      pxa_smi_probe(device_t);
   66 static int      pxa_smi_attach(device_t);
   67 
   68 static int      pxa_smi_print_child(device_t, device_t);
   69 
   70 static int      pxa_smi_read_ivar(device_t, device_t, int, uintptr_t *);
   71 
   72 static struct resource *        pxa_smi_alloc_resource(device_t, device_t,
   73                                     int, int *, u_long, u_long, u_long, u_int);
   74 static int                      pxa_smi_release_resource(device_t, device_t,
   75                                     int, int, struct resource *);
   76 static int                      pxa_smi_activate_resource(device_t, device_t,
   77                                     int, int, struct resource *);
   78 
   79 static void     pxa_smi_add_device(device_t, const char *, int);
   80 
   81 static int
   82 pxa_smi_probe(device_t dev)
   83 {
   84 
   85         if (resource_disabled("smi", device_get_unit(dev)))
   86                 return (ENXIO);
   87 
   88         device_set_desc(dev, "Static Memory Interface");
   89         return (0);
   90 }
   91 
   92 static int
   93 pxa_smi_attach(device_t dev)
   94 {
   95         int             error, i, dunit;
   96         const char      *dname;
   97         struct          pxa_smi_softc *sc;
   98 
   99         sc = (struct pxa_smi_softc *)device_get_softc(dev);
  100 
  101         error = bus_alloc_resources(dev, pxa_smi_spec, sc->ps_res);
  102         if (error) {
  103                 device_printf(dev, "could not allocate resources\n");
  104                 return (ENXIO);
  105         }
  106 
  107         sc->ps_mem.rm_type = RMAN_ARRAY;
  108         sc->ps_mem.rm_descr = device_get_nameunit(dev);
  109         if (rman_init(&sc->ps_mem) != 0)
  110                 panic("pxa_smi_attach: failed to init mem rman");
  111         if (rman_manage_region(&sc->ps_mem, 0, PXA2X0_CS_SIZE * 6) != 0)
  112                 panic("pxa_smi_attach: failed ot set up mem rman");
  113 
  114         sc->ps_bst = base_tag;
  115         sc->ps_base = rman_get_start(sc->ps_res[0]);
  116 
  117         i = 0;
  118         while (resource_find_match(&i, &dname, &dunit, "at",
  119             device_get_nameunit(dev)) == 0) {
  120                 pxa_smi_add_device(dev, dname, dunit);
  121         }
  122 
  123         bus_generic_probe(dev);
  124         bus_generic_attach(dev);
  125 
  126         return (0);
  127 }
  128 
  129 static int
  130 pxa_smi_print_child(device_t dev, device_t child)
  131 {
  132         struct  smi_ivars *smid;
  133         int     retval;
  134 
  135         smid = (struct smi_ivars *)device_get_ivars(child);
  136         if (smid == NULL) {
  137                 device_printf(dev, "unknown device: %s\n",
  138                     device_get_nameunit(child));
  139                 return (0);
  140         }
  141 
  142         retval = 0;
  143 
  144         retval += bus_print_child_header(dev, child);
  145 
  146         retval += resource_list_print_type(&smid->smid_resources, "at mem",
  147             SYS_RES_MEMORY, "%#lx");
  148         retval += resource_list_print_type(&smid->smid_resources, "irq",
  149             SYS_RES_IRQ, "%ld");
  150 
  151         retval += bus_print_child_footer(dev, child);
  152 
  153         return (retval);
  154 }
  155 
  156 static int
  157 pxa_smi_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  158 {
  159         struct  pxa_smi_softc *sc;
  160         struct  smi_ivars *smid;
  161 
  162         sc = device_get_softc(dev);
  163         smid = device_get_ivars(child);
  164 
  165         switch (which) {
  166         case SMI_IVAR_PHYSBASE:
  167                 *((bus_addr_t *)result) = smid->smid_mem;
  168                 break;
  169 
  170         default:
  171                 return (ENOENT);
  172         }
  173 
  174         return (0);
  175 }
  176 
  177 static struct resource *
  178 pxa_smi_alloc_resource(device_t dev, device_t child, int type, int *rid,
  179     u_long start, u_long end, u_long count, u_int flags)
  180 {
  181         struct  pxa_smi_softc *sc;
  182         struct  smi_ivars *smid;
  183         struct  resource *rv;
  184         struct  resource_list *rl;
  185         struct  resource_list_entry *rle;
  186         int     needactivate;
  187 
  188         sc = (struct pxa_smi_softc *)device_get_softc(dev);
  189         smid = (struct smi_ivars *)device_get_ivars(child);
  190         rl = &smid->smid_resources;
  191 
  192         if (type == SYS_RES_IOPORT)
  193                 type = SYS_RES_MEMORY;
  194 
  195         rle = resource_list_find(rl, type, *rid);
  196         if (rle == NULL)
  197                 return (NULL);
  198         if (rle->res != NULL)
  199                 panic("pxa_smi_alloc_resource: resource is busy");
  200 
  201         needactivate = flags & RF_ACTIVE;
  202         flags &= ~RF_ACTIVE;
  203 
  204         switch (type) {
  205         case SYS_RES_MEMORY:
  206                 rv = rman_reserve_resource(&sc->ps_mem, rle->start, rle->end,
  207                     rle->count, flags, child);
  208                 if (rv == NULL)
  209                         return (NULL);
  210                 rle->res = rv;
  211                 rman_set_rid(rv, *rid);
  212                 rman_set_bustag(rv, sc->ps_bst);
  213                 rman_set_bushandle(rv, rle->start);
  214                 if (needactivate) {
  215                         if (bus_activate_resource(child, type, *rid, rv) != 0) {
  216                                 rman_release_resource(rv);
  217                                 return (NULL);
  218                         }
  219                 }
  220 
  221                 break;
  222 
  223         case SYS_RES_IRQ:
  224                 rv = bus_alloc_resource(dev, type, rid, rle->start, rle->end,
  225                     rle->count, flags);
  226                 if (rv == NULL)
  227                         return (NULL);
  228                 if (needactivate) {
  229                         if (bus_activate_resource(child, type, *rid, rv) != 0) {
  230                                 bus_release_resource(dev, type, *rid, rv);
  231                                 return (NULL);
  232                         }
  233                 }
  234 
  235                 break;
  236 
  237         default:
  238                 return (NULL);
  239         }
  240 
  241         return (rv);
  242 }
  243 
  244 static int
  245 pxa_smi_release_resource(device_t dev, device_t child, int type, int rid,
  246     struct resource *r)
  247 {
  248         struct  smi_ivars *smid;
  249         struct  resource_list *rl;
  250         struct  resource_list_entry *rle;
  251 
  252         if (type == SYS_RES_IRQ)
  253                 return (bus_release_resource(dev, SYS_RES_IRQ, rid, r));
  254 
  255         smid = (struct smi_ivars *)device_get_ivars(child);
  256         rl = &smid->smid_resources;
  257 
  258         if (type == SYS_RES_IOPORT)
  259                 type = SYS_RES_MEMORY;
  260 
  261         rle = resource_list_find(rl, type, rid);
  262         if (rle == NULL)
  263                 panic("pxa_smi_release_resource: can't find resource");
  264         if (rle->res == NULL)
  265                 panic("pxa_smi_release_resource: resource entry not busy");
  266 
  267         rman_release_resource(rle->res);
  268         rle->res = NULL;
  269 
  270         return (0);
  271 }
  272 
  273 static int
  274 pxa_smi_activate_resource(device_t dev, device_t child, int type, int rid,
  275     struct resource *r)
  276 {
  277         struct  pxa_smi_softc *sc;
  278 
  279         sc = (struct pxa_smi_softc *)device_get_softc(dev);
  280 
  281         if (type == SYS_RES_IRQ)
  282                 return (bus_activate_resource(dev, SYS_RES_IRQ, rid, r));
  283 
  284         rman_set_bushandle(r, (bus_space_handle_t)pmap_mapdev(rman_get_start(r),
  285             rman_get_size(r)));
  286         return (rman_activate_resource(r));
  287 }
  288 
  289 static device_method_t pxa_smi_methods[] = {
  290         DEVMETHOD(device_probe, pxa_smi_probe),
  291         DEVMETHOD(device_attach, pxa_smi_attach),
  292 
  293         DEVMETHOD(bus_print_child, pxa_smi_print_child),
  294 
  295         DEVMETHOD(bus_read_ivar, pxa_smi_read_ivar),
  296 
  297         DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
  298 
  299         DEVMETHOD(bus_alloc_resource, pxa_smi_alloc_resource),
  300         DEVMETHOD(bus_release_resource, pxa_smi_release_resource),
  301         DEVMETHOD(bus_activate_resource, pxa_smi_activate_resource),
  302 
  303         {0, 0}
  304 };
  305 
  306 static driver_t pxa_smi_driver = {
  307         "smi",
  308         pxa_smi_methods,
  309         sizeof(struct pxa_smi_softc),
  310 };
  311 
  312 static devclass_t pxa_smi_devclass;
  313 
  314 DRIVER_MODULE(smi, pxa, pxa_smi_driver, pxa_smi_devclass, 0, 0);
  315 
  316 static void
  317 pxa_smi_add_device(device_t dev, const char *name, int unit)
  318 {
  319         device_t        child;
  320         int             start, count;
  321         struct          smi_ivars *ivars;
  322 
  323         ivars = (struct smi_ivars *)malloc(
  324             sizeof(struct smi_ivars), M_PXASMI, M_WAITOK);
  325         if (ivars == NULL)
  326                 return;
  327 
  328         child = device_add_child(dev, name, unit);
  329         if (child == NULL) {
  330                 free(ivars, M_PXASMI);
  331                 return;
  332         }
  333 
  334         device_set_ivars(child, ivars);
  335         resource_list_init(&ivars->smid_resources);
  336 
  337         start = 0;
  338         count = 0;
  339         resource_int_value(name, unit, "mem", &start);
  340         resource_int_value(name, unit, "size", &count);
  341         if (start > 0 || count > 0) {
  342                 resource_list_add(&ivars->smid_resources, SYS_RES_MEMORY, 0,
  343                     start, start + count, count);
  344                 ivars->smid_mem = (bus_addr_t)start;
  345         }
  346 
  347         start = -1;
  348         count = 0;
  349         resource_int_value(name, unit, "irq", &start);
  350         if (start > -1)
  351                 resource_list_add(&ivars->smid_resources, SYS_RES_IRQ, 0, start,
  352                      start, 1);
  353 
  354         if (resource_disabled(name, unit))
  355                 device_disable(child);
  356 }

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