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

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    1 /*-
    2  * Copyright 1998 Massachusetts Institute of Technology
    3  *
    4  * Permission to use, copy, modify, and distribute this software and
    5  * its documentation for any purpose and without fee is hereby
    6  * granted, provided that both the above copyright notice and this
    7  * permission notice appear in all copies, that both the above
    8  * copyright notice and this permission notice appear in all
    9  * supporting documentation, and that the name of M.I.T. not be used
   10  * in advertising or publicity pertaining to distribution of the
   11  * software without specific, written prior permission.  M.I.T. makes
   12  * no representations about the suitability of this software for any
   13  * purpose.  It is provided "as is" without express or implied
   14  * warranty.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  */
   30 
   31 /*
   32  * This code implements a `root nexus' for RISC-V Architecture
   33  * machines.  The function of the root nexus is to serve as an
   34  * attachment point for both processors and buses, and to manage
   35  * resources which are common to all of them.  In particular,
   36  * this code implements the core resource managers for interrupt
   37  * requests, DMA requests (which rightfully should be a part of the
   38  * ISA code but it's easier to do it here for now), I/O port addresses,
   39  * and I/O memory address space.
   40  */
   41 #include "opt_platform.h"
   42 
   43 #include <sys/cdefs.h>
   44 __FBSDID("$FreeBSD$");
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/bus.h>
   49 #include <sys/kernel.h>
   50 #include <sys/malloc.h>
   51 #include <sys/module.h>
   52 #include <sys/rman.h>
   53 #include <sys/interrupt.h>
   54 
   55 #include <machine/bus.h>
   56 #include <machine/resource.h>
   57 #include <machine/intr.h>
   58 
   59 #ifdef FDT
   60 #include <dev/ofw/ofw_bus_subr.h>
   61 #include <dev/ofw/openfirm.h>
   62 #include "ofw_bus_if.h"
   63 #endif
   64 
   65 extern struct bus_space memmap_bus;
   66 
   67 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
   68 
   69 struct nexus_device {
   70         struct resource_list    nx_resources;
   71 };
   72 
   73 #define DEVTONX(dev)    ((struct nexus_device *)device_get_ivars(dev))
   74 
   75 static struct rman mem_rman;
   76 static struct rman irq_rman;
   77 
   78 static device_probe_t nexus_fdt_probe;
   79 static int nexus_attach(device_t);
   80 
   81 static  int nexus_print_child(device_t, device_t);
   82 static  device_t nexus_add_child(device_t, u_int, const char *, int);
   83 static  struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
   84     u_long, u_long, u_long, u_int);
   85 static  int nexus_activate_resource(device_t, device_t, int, int,
   86     struct resource *);
   87 static int nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
   88     enum intr_polarity pol);
   89 static struct resource_list *nexus_get_reslist(device_t, device_t);
   90 static  int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
   91 static  int nexus_deactivate_resource(device_t, device_t, int, int,
   92     struct resource *);
   93 
   94 static int nexus_setup_intr(device_t dev, device_t child, struct resource *res,
   95     int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep);
   96 static int nexus_teardown_intr(device_t, device_t, struct resource *, void *);
   97 
   98 static int nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent,
   99     int icells, pcell_t *intr);
  100 
  101 static device_method_t nexus_methods[] = {
  102         /* Device interface */
  103         DEVMETHOD(device_probe,         nexus_fdt_probe),
  104         DEVMETHOD(device_attach,        nexus_attach),
  105 
  106         /* OFW interface */
  107         DEVMETHOD(ofw_bus_map_intr,     nexus_ofw_map_intr),
  108 
  109         /* Bus interface */
  110         DEVMETHOD(bus_print_child,      nexus_print_child),
  111         DEVMETHOD(bus_add_child,        nexus_add_child),
  112         DEVMETHOD(bus_alloc_resource,   nexus_alloc_resource),
  113         DEVMETHOD(bus_activate_resource,        nexus_activate_resource),
  114         DEVMETHOD(bus_config_intr,      nexus_config_intr),
  115         DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
  116         DEVMETHOD(bus_set_resource,     nexus_set_resource),
  117         DEVMETHOD(bus_deactivate_resource,      nexus_deactivate_resource),
  118         DEVMETHOD(bus_setup_intr,       nexus_setup_intr),
  119         DEVMETHOD(bus_teardown_intr,    nexus_teardown_intr),
  120 
  121         { 0, 0 }
  122 };
  123 
  124 static driver_t nexus_fdt_driver = {
  125         "nexus",
  126         nexus_methods,
  127         1                       /* no softc */
  128 };
  129 
  130 static int
  131 nexus_fdt_probe(device_t dev)
  132 {
  133 
  134         device_quiet(dev);
  135         return (BUS_PROBE_DEFAULT);
  136 }
  137 
  138 static int
  139 nexus_attach(device_t dev)
  140 {
  141 
  142         mem_rman.rm_start = 0;
  143         mem_rman.rm_end = BUS_SPACE_MAXADDR;
  144         mem_rman.rm_type = RMAN_ARRAY;
  145         mem_rman.rm_descr = "I/O memory addresses";
  146         if (rman_init(&mem_rman) ||
  147             rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR))
  148                 panic("nexus_attach mem_rman");
  149         irq_rman.rm_start = 0;
  150         irq_rman.rm_end = ~0;
  151         irq_rman.rm_type = RMAN_ARRAY;
  152         irq_rman.rm_descr = "Interrupts";
  153         if (rman_init(&irq_rman) || rman_manage_region(&irq_rman, 0, ~0))
  154                 panic("nexus_attach irq_rman");
  155 
  156         nexus_add_child(dev, 8, "timer", 0);
  157         nexus_add_child(dev, 9, "rcons", 0);
  158         nexus_add_child(dev, 10, "ofwbus", 0);
  159 
  160         bus_generic_probe(dev);
  161         bus_generic_attach(dev);
  162 
  163         return (0);
  164 }
  165 
  166 static int
  167 nexus_print_child(device_t bus, device_t child)
  168 {
  169         int retval = 0;
  170 
  171         retval += bus_print_child_header(bus, child);
  172         retval += printf("\n");
  173 
  174         return (retval);
  175 }
  176 
  177 static device_t
  178 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
  179 {
  180         device_t child;
  181         struct nexus_device *ndev;
  182 
  183         ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
  184         if (!ndev)
  185                 return (0);
  186         resource_list_init(&ndev->nx_resources);
  187 
  188         child = device_add_child_ordered(bus, order, name, unit);
  189 
  190         /* should we free this in nexus_child_detached? */
  191         device_set_ivars(child, ndev);
  192 
  193         return (child);
  194 }
  195 
  196 
  197 /*
  198  * Allocate a resource on behalf of child.  NB: child is usually going to be a
  199  * child of one of our descendants, not a direct child of nexus0.
  200  * (Exceptions include footbridge.)
  201  */
  202 static struct resource *
  203 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  204     u_long start, u_long end, u_long count, u_int flags)
  205 {
  206         struct nexus_device *ndev = DEVTONX(child);
  207         struct resource *rv;
  208         struct resource_list_entry *rle;
  209         struct rman *rm;
  210         int needactivate = flags & RF_ACTIVE;
  211 
  212         /*
  213          * If this is an allocation of the "default" range for a given
  214          * RID, and we know what the resources for this device are
  215          * (ie. they aren't maintained by a child bus), then work out
  216          * the start/end values.
  217          */
  218         if (RMAN_IS_DEFAULT_RANGE(start, end) && (count == 1)) {
  219                 if (device_get_parent(child) != bus || ndev == NULL)
  220                         return(NULL);
  221                 rle = resource_list_find(&ndev->nx_resources, type, *rid);
  222                 if (rle == NULL)
  223                         return(NULL);
  224                 start = rle->start;
  225                 end = rle->end;
  226                 count = rle->count;
  227         }
  228 
  229         switch (type) {
  230         case SYS_RES_IRQ:
  231                 rm = &irq_rman;
  232                 break;
  233 
  234         case SYS_RES_MEMORY:
  235         case SYS_RES_IOPORT:
  236                 rm = &mem_rman;
  237                 break;
  238 
  239         default:
  240                 return (NULL);
  241         }
  242 
  243         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  244         if (rv == NULL)
  245                 return (NULL);
  246 
  247         rman_set_rid(rv, *rid);
  248         rman_set_bushandle(rv, rman_get_start(rv));
  249 
  250         if (needactivate) {
  251                 if (bus_activate_resource(child, type, *rid, rv)) {
  252                         rman_release_resource(rv);
  253                         return (NULL);
  254                 }
  255         }
  256 
  257         return (rv);
  258 }
  259 
  260 static int
  261 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
  262     enum intr_polarity pol)
  263 {
  264 
  265         return (EOPNOTSUPP);
  266 }
  267 
  268 static int
  269 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
  270     driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
  271 {
  272         int error;
  273 
  274         if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
  275                 flags |= INTR_EXCL;
  276 
  277         /* We depend here on rman_activate_resource() being idempotent. */
  278         error = rman_activate_resource(res);
  279         if (error)
  280                 return (error);
  281 
  282         error = intr_setup_irq(child, res, filt, intr, arg, flags, cookiep);
  283 
  284         return (error);
  285 }
  286 
  287 static int
  288 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
  289 {
  290 
  291         return (intr_teardown_irq(child, r, ih));
  292 }
  293 
  294 static int
  295 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
  296     struct resource *r)
  297 {
  298         int err;
  299         bus_addr_t paddr;
  300         bus_size_t psize;
  301         bus_space_handle_t vaddr;
  302 
  303         if ((err = rman_activate_resource(r)) != 0)
  304                 return (err);
  305 
  306         /*
  307          * If this is a memory resource, map it into the kernel.
  308          */
  309         if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
  310                 paddr = (bus_addr_t)rman_get_start(r);
  311                 psize = (bus_size_t)rman_get_size(r);
  312                 err = bus_space_map(&memmap_bus, paddr, psize, 0, &vaddr);
  313                 if (err != 0) {
  314                         rman_deactivate_resource(r);
  315                         return (err);
  316                 }
  317                 rman_set_bustag(r, &memmap_bus);
  318                 rman_set_virtual(r, (void *)vaddr);
  319                 rman_set_bushandle(r, vaddr);
  320         } else if (type == SYS_RES_IRQ) {
  321                 err = intr_activate_irq(child, r);
  322                 if (err != 0) {
  323                         rman_deactivate_resource(r);
  324                         return (err);
  325                 }
  326         }
  327 
  328         return (0);
  329 }
  330 
  331 static struct resource_list *
  332 nexus_get_reslist(device_t dev, device_t child)
  333 {
  334         struct nexus_device *ndev = DEVTONX(child);
  335 
  336         return (&ndev->nx_resources);
  337 }
  338 
  339 static int
  340 nexus_set_resource(device_t dev, device_t child, int type, int rid,
  341     u_long start, u_long count)
  342 {
  343         struct nexus_device     *ndev = DEVTONX(child);
  344         struct resource_list    *rl = &ndev->nx_resources;
  345 
  346         /* XXX this should return a success/failure indicator */
  347         resource_list_add(rl, type, rid, start, start + count - 1, count);
  348 
  349         return(0);
  350 }
  351 
  352 
  353 static int
  354 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
  355     struct resource *r)
  356 {
  357         bus_size_t psize;
  358         bus_space_handle_t vaddr;
  359 
  360         if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
  361                 psize = (bus_size_t)rman_get_size(r);
  362                 vaddr = rman_get_bushandle(r);
  363 
  364                 if (vaddr != 0) {
  365                         bus_space_unmap(&memmap_bus, vaddr, psize);
  366                         rman_set_virtual(r, NULL);
  367                         rman_set_bushandle(r, 0);
  368                 }
  369         } else if (type == SYS_RES_IRQ) {
  370                 intr_deactivate_irq(child, r);
  371         }
  372 
  373         return (rman_deactivate_resource(r));
  374 }
  375 
  376 static devclass_t nexus_fdt_devclass;
  377 
  378 EARLY_DRIVER_MODULE(nexus_fdt, root, nexus_fdt_driver, nexus_fdt_devclass,
  379     0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_FIRST);
  380 
  381 static int
  382 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
  383     pcell_t *intr)
  384 {
  385         struct intr_map_data_fdt *fdt_data;
  386         size_t len;
  387         u_int irq;
  388 
  389         len = sizeof(*fdt_data) + icells * sizeof(pcell_t);
  390         fdt_data = (struct intr_map_data_fdt *)intr_alloc_map_data(
  391             INTR_MAP_DATA_FDT, len, M_WAITOK | M_ZERO);
  392         fdt_data->iparent = iparent;
  393         fdt_data->ncells = icells;
  394         memcpy(fdt_data->cells, intr, icells * sizeof(pcell_t));
  395         irq = intr_map_irq(NULL, iparent, (struct intr_map_data *)fdt_data);
  396 
  397         return (irq);
  398 }

Cache object: 7372c39aba209927507162aa67c1c82e


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