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/mv/mv_localbus.c

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    1 /*-
    2  * Copyright (c) 2012 Semihalf.
    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  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/11.1/sys/arm/mv/mv_localbus.c 299702 2016-05-13 22:05:16Z gonzo $");
   29 
   30 #include "opt_platform.h"
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/ktr.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 #include <sys/bus.h>
   37 #include <sys/rman.h>
   38 #include <sys/malloc.h>
   39 #include <sys/devmap.h>
   40 
   41 #include <vm/vm.h>
   42 
   43 #include <machine/fdt.h>
   44 
   45 #include <dev/ofw/ofw_bus.h>
   46 #include <dev/ofw/ofw_bus_subr.h>
   47 #include <dev/ofw/openfirm.h>
   48 
   49 #include "dev/fdt/fdt_common.h"
   50 #include "ofw_bus_if.h"
   51 
   52 #include <arm/mv/mvvar.h>
   53 #include <arm/mv/mvwin.h>
   54 
   55 #ifdef DEBUG
   56 #define debugf(fmt, args...) do { printf("%s(): ", __func__);   \
   57     printf(fmt,##args); } while (0)
   58 #else
   59 #define debugf(fmt, args...)
   60 #endif
   61 
   62 #define MV_LOCALBUS_MAX_BANKS           8
   63 #define MV_LOCALBUS_MAX_BANK_CELLS      4
   64 
   65 static MALLOC_DEFINE(M_LOCALBUS, "localbus", "localbus devices information");
   66 
   67 struct localbus_bank {
   68         vm_offset_t     va;             /* VA of the bank */
   69         vm_paddr_t      pa;             /* physical address of the bank */
   70         vm_size_t       size;           /* bank size */
   71         uint8_t         mapped;         /* device memory has mapping */
   72 };
   73 
   74 struct localbus_softc {
   75         device_t                sc_dev;
   76         bus_space_handle_t      sc_bsh;
   77         bus_space_tag_t         sc_bst;
   78         int                     sc_rid;
   79 
   80         struct localbus_bank    *sc_banks;
   81 };
   82 
   83 struct localbus_devinfo {
   84         struct ofw_bus_devinfo  di_ofw;
   85         struct resource_list    di_res;
   86         int                     di_bank;
   87 };
   88 
   89 struct localbus_va_entry {
   90         int8_t          bank;
   91         vm_offset_t     va;
   92         vm_size_t       size;
   93 };
   94 
   95 /*
   96  * Prototypes.
   97  */
   98 static int localbus_probe(device_t);
   99 static int localbus_attach(device_t);
  100 static int localbus_print_child(device_t, device_t);
  101 
  102 static struct resource *localbus_alloc_resource(device_t, device_t, int,
  103     int *, rman_res_t, rman_res_t, rman_res_t, u_int);
  104 static struct resource_list *localbus_get_resource_list(device_t, device_t);
  105 
  106 static ofw_bus_get_devinfo_t localbus_get_devinfo;
  107 
  108 /*
  109  * Bus interface definition.
  110  */
  111 static device_method_t localbus_methods[] = {
  112         /* Device interface */
  113         DEVMETHOD(device_probe,         localbus_probe),
  114         DEVMETHOD(device_attach,        localbus_attach),
  115         DEVMETHOD(device_detach,        bus_generic_detach),
  116         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  117         DEVMETHOD(device_suspend,       bus_generic_suspend),
  118         DEVMETHOD(device_resume,        bus_generic_resume),
  119 
  120         /* Bus interface */
  121         DEVMETHOD(bus_print_child,      localbus_print_child),
  122         DEVMETHOD(bus_alloc_resource,   localbus_alloc_resource),
  123         DEVMETHOD(bus_release_resource, bus_generic_release_resource),
  124         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
  125         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
  126         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
  127         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
  128         DEVMETHOD(bus_get_resource_list, localbus_get_resource_list),
  129 
  130         /* OFW bus interface */
  131         DEVMETHOD(ofw_bus_get_devinfo,  localbus_get_devinfo),
  132         DEVMETHOD(ofw_bus_get_compat,   ofw_bus_gen_get_compat),
  133         DEVMETHOD(ofw_bus_get_model,    ofw_bus_gen_get_model),
  134         DEVMETHOD(ofw_bus_get_name,     ofw_bus_gen_get_name),
  135         DEVMETHOD(ofw_bus_get_node,     ofw_bus_gen_get_node),
  136         DEVMETHOD(ofw_bus_get_type,     ofw_bus_gen_get_type),
  137 
  138         { 0, 0 }
  139 };
  140 
  141 static driver_t localbus_driver = {
  142         "localbus",
  143         localbus_methods,
  144         sizeof(struct localbus_softc)
  145 };
  146 
  147 const struct localbus_va_entry localbus_virtmap[] = {
  148         {  0, MV_DEV_BOOT_BASE,         MV_DEV_BOOT_SIZE },
  149         {  1, MV_DEV_CS0_BASE,          MV_DEV_CS0_SIZE },
  150         {  2, MV_DEV_CS1_BASE,          MV_DEV_CS1_SIZE },
  151         {  3, MV_DEV_CS2_BASE,          MV_DEV_CS2_SIZE },
  152 
  153         { -1, 0, 0 }
  154 };
  155 
  156 static struct localbus_bank localbus_banks[MV_LOCALBUS_MAX_BANKS];
  157 
  158 devclass_t localbus_devclass;
  159 
  160 DRIVER_MODULE(localbus, ofwbus, localbus_driver, localbus_devclass, 0, 0);
  161 
  162 static int
  163 fdt_localbus_reg_decode(phandle_t node, struct localbus_softc *sc,
  164     struct localbus_devinfo *di)
  165 {
  166         u_long start, end, count;
  167         pcell_t *reg, *regptr;
  168         pcell_t addr_cells, size_cells;
  169         int tuple_size, tuples;
  170         int i, rv, bank;
  171 
  172         if (fdt_addrsize_cells(OF_parent(node), &addr_cells, &size_cells) != 0)
  173                 return (ENXIO);
  174 
  175         tuple_size = sizeof(pcell_t) * (addr_cells + size_cells);
  176         tuples = OF_getprop_alloc(node, "reg", tuple_size, (void **)&reg);
  177         debugf("addr_cells = %d, size_cells = %d\n", addr_cells, size_cells);
  178         debugf("tuples = %d, tuple size = %d\n", tuples, tuple_size);
  179         if (tuples <= 0)
  180                 /* No 'reg' property in this node. */
  181                 return (0);
  182 
  183         regptr = reg;
  184         for (i = 0; i < tuples; i++) {
  185 
  186                 bank = fdt_data_get((void *)regptr, 1);
  187 
  188                 if (bank >= MV_LOCALBUS_MAX_BANKS) {
  189                         device_printf(sc->sc_dev, "bank number [%d] out of "
  190                             "range\n", bank);
  191                         continue;
  192                 }
  193 
  194                 /*
  195                  * If device doesn't have virtual to physical mapping don't add
  196                  * resources
  197                  */
  198                 if (!(sc->sc_banks[bank].mapped)) {
  199                         device_printf(sc->sc_dev, "device [%d]: missing memory "
  200                             "mapping\n", bank);
  201                         continue;
  202                 }
  203 
  204                 di->di_bank = bank;
  205                 regptr += 1;
  206 
  207                 /* Get address/size. */
  208                 rv = fdt_data_to_res(regptr, addr_cells - 1, size_cells, &start,
  209                     &count);
  210                 if (rv != 0) {
  211                         resource_list_free(&di->di_res);
  212                         goto out;
  213                 }
  214 
  215                 /* Check if enough amount of memory is mapped */
  216                 if (sc->sc_banks[bank].size < count) {
  217                         device_printf(sc->sc_dev, "device [%d]: not enough "
  218                             "memory reserved\n", bank);
  219                         continue;
  220                 }
  221 
  222                 regptr += addr_cells - 1 + size_cells;
  223 
  224                 /* Calculate address range relative to VA base. */
  225                 start = sc->sc_banks[bank].va + start;
  226                 end = start + count - 1;
  227 
  228                 debugf("reg addr bank = %d, start = %lx, end = %lx, "
  229                     "count = %lx\n", bank, start, end, count);
  230 
  231                 /* Use bank (CS) cell as rid. */
  232                 resource_list_add(&di->di_res, SYS_RES_MEMORY, di->di_bank,
  233                     start, end, count);
  234         }
  235         rv = 0;
  236 out:
  237         OF_prop_free(reg);
  238         return (rv);
  239 }
  240 
  241 static int
  242 localbus_probe(device_t dev)
  243 {
  244 
  245         if (!ofw_bus_is_compatible_strict(dev, "mrvl,lbc"))
  246                 return (ENXIO);
  247 
  248         device_set_desc(dev, "Marvell device bus");
  249 
  250         return (BUS_PROBE_DEFAULT);
  251 }
  252 
  253 static int
  254 localbus_attach(device_t dev)
  255 {
  256         device_t dev_child;
  257         struct localbus_softc *sc;
  258         struct localbus_devinfo *di;
  259         phandle_t dt_node, dt_child;
  260 
  261         sc = device_get_softc(dev);
  262         sc->sc_dev = dev;
  263         sc->sc_banks = localbus_banks;
  264 
  265         /*
  266          * Walk localbus and add direct subordinates as our children.
  267          */
  268         dt_node = ofw_bus_get_node(dev);
  269         for (dt_child = OF_child(dt_node); dt_child != 0;
  270             dt_child = OF_peer(dt_child)) {
  271 
  272                 /* Check and process 'status' property. */
  273                 if (!(fdt_is_enabled(dt_child)))
  274                         continue;
  275 
  276                 if (!(fdt_pm_is_enabled(dt_child)))
  277                         continue;
  278 
  279                 di = malloc(sizeof(*di), M_LOCALBUS, M_WAITOK | M_ZERO);
  280                 if (ofw_bus_gen_setup_devinfo(&di->di_ofw, dt_child) != 0) {
  281                         free(di, M_LOCALBUS);
  282                         device_printf(dev, "could not set up devinfo\n");
  283                         continue;
  284                 }
  285 
  286                 resource_list_init(&di->di_res);
  287                 if (fdt_localbus_reg_decode(dt_child, sc, di)) {
  288                         device_printf(dev, "could not process 'reg' "
  289                             "property\n");
  290                         ofw_bus_gen_destroy_devinfo(&di->di_ofw);
  291                         free(di, M_LOCALBUS);
  292                         continue;
  293                 }
  294 
  295                 /* Add newbus device for this FDT node */
  296                 dev_child = device_add_child(dev, NULL, -1);
  297                 if (dev_child == NULL) {
  298                         device_printf(dev, "could not add child: %s\n",
  299                             di->di_ofw.obd_name);
  300                         resource_list_free(&di->di_res);
  301                         ofw_bus_gen_destroy_devinfo(&di->di_ofw);
  302                         free(di, M_LOCALBUS);
  303                         continue;
  304                 }
  305 #ifdef DEBUG
  306                 device_printf(dev, "added child: %s\n\n", di->di_ofw.obd_name);
  307 #endif
  308                 device_set_ivars(dev_child, di);
  309         }
  310 
  311         return (bus_generic_attach(dev));
  312 }
  313 
  314 static int
  315 localbus_print_child(device_t dev, device_t child)
  316 {
  317         struct localbus_devinfo *di;
  318         struct resource_list *rl;
  319         int rv;
  320 
  321         di = device_get_ivars(child);
  322         rl = &di->di_res;
  323 
  324         rv = 0;
  325         rv += bus_print_child_header(dev, child);
  326         rv += resource_list_print_type(rl, "mem", SYS_RES_MEMORY, "%#jx");
  327         rv += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%jd");
  328         rv += bus_print_child_footer(dev, child);
  329 
  330         return (rv);
  331 }
  332 
  333 static struct resource *
  334 localbus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  335     rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
  336 {
  337         struct localbus_devinfo *di;
  338         struct resource_list_entry *rle;
  339 
  340         /*
  341          * Request for the default allocation with a given rid: use resource
  342          * list stored in the local device info.
  343          */
  344         if (RMAN_IS_DEFAULT_RANGE(start, end)) {
  345                 if ((di = device_get_ivars(child)) == NULL)
  346                         return (NULL);
  347 
  348                 if (type == SYS_RES_IOPORT)
  349                         type = SYS_RES_MEMORY;
  350 
  351                 rid = &di->di_bank;
  352                 rle = resource_list_find(&di->di_res, type, *rid);
  353                 if (rle == NULL) {
  354                         device_printf(bus, "no default resources for "
  355                             "rid = %d, type = %d\n", *rid, type);
  356                         return (NULL);
  357                 }
  358                 start = rle->start;
  359                 end = rle->end;
  360                 count = rle->count;
  361         }
  362 
  363         return (bus_generic_alloc_resource(bus, child, type, rid, start, end,
  364             count, flags));
  365 }
  366 
  367 
  368 static struct resource_list *
  369 localbus_get_resource_list(device_t bus, device_t child)
  370 {
  371         struct localbus_devinfo *di;
  372 
  373         di = device_get_ivars(child);
  374         return (&di->di_res);
  375 }
  376 
  377 static const struct ofw_bus_devinfo *
  378 localbus_get_devinfo(device_t bus, device_t child)
  379 {
  380         struct localbus_devinfo *di;
  381 
  382         di = device_get_ivars(child);
  383         return (&di->di_ofw);
  384 }
  385 
  386 int
  387 fdt_localbus_devmap(phandle_t dt_node, struct devmap_entry *fdt_devmap,
  388     int banks_max_num, int *banks_added)
  389 {
  390         pcell_t ranges[MV_LOCALBUS_MAX_BANKS * MV_LOCALBUS_MAX_BANK_CELLS];
  391         pcell_t *rangesptr;
  392         uint32_t tuple_size, bank;
  393         vm_paddr_t offset;
  394         vm_size_t size;
  395         int dev_num, addr_cells, size_cells, par_addr_cells, va_index, i, j, k;
  396 
  397         if ((fdt_addrsize_cells(dt_node, &addr_cells, &size_cells)) != 0)
  398                 return (EINVAL);
  399 
  400         par_addr_cells = fdt_parent_addr_cells(dt_node);
  401         if (par_addr_cells > 2) {
  402                 /*
  403                  * Localbus devmap initialization error: unsupported parent
  404                  * #addr-cells
  405                  */
  406                 return (ERANGE);
  407         }
  408 
  409         tuple_size = (addr_cells + par_addr_cells + size_cells);
  410         if (tuple_size > MV_LOCALBUS_MAX_BANK_CELLS)
  411                 return (ERANGE);
  412 
  413         tuple_size *= sizeof(pcell_t);
  414 
  415         dev_num = OF_getprop(dt_node, "ranges", ranges, sizeof(ranges));
  416         if (dev_num <= 0)
  417                 return (EINVAL);
  418 
  419         /* Calculate number of devices attached to bus */
  420         dev_num = dev_num / tuple_size;
  421 
  422         /*
  423          * If number of ranges > max number of localbus devices,
  424          * additional entries will not be processed
  425          */
  426         dev_num = MIN(dev_num, banks_max_num);
  427 
  428         rangesptr = &ranges[0];
  429         j = 0;
  430 
  431         /* Process data from FDT */
  432         for (i = 0; i < dev_num; i++) {
  433 
  434                 /* First field is bank number */
  435                 bank = fdt_data_get((void *)rangesptr, 1);
  436                 rangesptr += 1;
  437 
  438                 if (bank > MV_LOCALBUS_MAX_BANKS) {
  439                         /* Bank out of range */
  440                         rangesptr += ((addr_cells - 1) + par_addr_cells +
  441                             size_cells);
  442                         continue;
  443                 }
  444 
  445                 /* Find virtmap entry for this bank */
  446                 va_index = -1;
  447                 for (k = 0; localbus_virtmap[k].bank >= 0; k++) {
  448                         if (localbus_virtmap[k].bank == bank) {
  449                                 va_index = k;
  450                                 break;
  451                         }
  452                 }
  453 
  454                 /* Check if virtmap entry was found */
  455                 if (va_index == -1) {
  456                         rangesptr += ((addr_cells - 1) + par_addr_cells +
  457                             size_cells);
  458                         continue;
  459                 }
  460 
  461                 /* Remaining child's address fields are unused */
  462                 rangesptr += (addr_cells - 1);
  463 
  464                 /* Parent address offset */
  465                 offset = fdt_data_get((void *)rangesptr, par_addr_cells);
  466                 rangesptr += par_addr_cells;
  467 
  468                 /* Last field is size */
  469                 size = fdt_data_get((void *)rangesptr, size_cells);
  470                 rangesptr += size_cells;
  471 
  472                 if (size > localbus_virtmap[va_index].size) {
  473                         /* Not enough space reserved in virtual memory map */
  474                         continue;
  475                 }
  476 
  477                 fdt_devmap[j].pd_va = localbus_virtmap[va_index].va;
  478                 fdt_devmap[j].pd_pa = offset;
  479                 fdt_devmap[j].pd_size = size;
  480 
  481                 /* Copy data to structure used by localbus driver */
  482                 localbus_banks[bank].va = fdt_devmap[j].pd_va;
  483                 localbus_banks[bank].pa = fdt_devmap[j].pd_pa;
  484                 localbus_banks[bank].size = fdt_devmap[j].pd_size;
  485                 localbus_banks[bank].mapped = 1;
  486 
  487                 j++;
  488         }
  489 
  490         *banks_added = j;
  491         return (0);
  492 }

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