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/10.0/sys/arm/mv/mv_localbus.c 235656 2012-05-19 18:16:49Z marcel $");
   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 
   40 #include <machine/fdt.h>
   41 
   42 #include <dev/ofw/ofw_bus.h>
   43 #include <dev/ofw/ofw_bus_subr.h>
   44 #include <dev/ofw/openfirm.h>
   45 
   46 #include "dev/fdt/fdt_common.h"
   47 #include "ofw_bus_if.h"
   48 
   49 #include <arm/mv/mvwin.h>
   50 
   51 #ifdef DEBUG
   52 #define debugf(fmt, args...) do { printf("%s(): ", __func__);   \
   53     printf(fmt,##args); } while (0)
   54 #else
   55 #define debugf(fmt, args...)
   56 #endif
   57 
   58 #define MV_LOCALBUS_MAX_BANKS           8
   59 #define MV_LOCALBUS_MAX_BANK_CELLS      4
   60 
   61 static MALLOC_DEFINE(M_LOCALBUS, "localbus", "localbus devices information");
   62 
   63 struct localbus_bank {
   64         vm_offset_t     va;             /* VA of the bank */
   65         vm_paddr_t      pa;             /* physical address of the bank */
   66         vm_size_t       size;           /* bank size */
   67         uint8_t         mapped;         /* device memory has mapping */
   68 };
   69 
   70 struct localbus_softc {
   71         device_t                sc_dev;
   72         bus_space_handle_t      sc_bsh;
   73         bus_space_tag_t         sc_bst;
   74         int                     sc_rid;
   75 
   76         struct localbus_bank    *sc_banks;
   77 };
   78 
   79 struct localbus_devinfo {
   80         struct ofw_bus_devinfo  di_ofw;
   81         struct resource_list    di_res;
   82         int                     di_bank;
   83 };
   84 
   85 struct localbus_va_entry {
   86         int8_t          bank;
   87         vm_offset_t     va;
   88         vm_size_t       size;
   89 };
   90 
   91 /*
   92  * Prototypes.
   93  */
   94 static int localbus_probe(device_t);
   95 static int localbus_attach(device_t);
   96 static int localbus_print_child(device_t, device_t);
   97 
   98 static struct resource *localbus_alloc_resource(device_t, device_t, int,
   99     int *, u_long, u_long, u_long, u_int);
  100 static struct resource_list *localbus_get_resource_list(device_t, device_t);
  101 
  102 static ofw_bus_get_devinfo_t localbus_get_devinfo;
  103 
  104 /*
  105  * Bus interface definition.
  106  */
  107 static device_method_t localbus_methods[] = {
  108         /* Device interface */
  109         DEVMETHOD(device_probe,         localbus_probe),
  110         DEVMETHOD(device_attach,        localbus_attach),
  111         DEVMETHOD(device_detach,        bus_generic_detach),
  112         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  113         DEVMETHOD(device_suspend,       bus_generic_suspend),
  114         DEVMETHOD(device_resume,        bus_generic_resume),
  115 
  116         /* Bus interface */
  117         DEVMETHOD(bus_print_child,      localbus_print_child),
  118         DEVMETHOD(bus_alloc_resource,   localbus_alloc_resource),
  119         DEVMETHOD(bus_release_resource, bus_generic_release_resource),
  120         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
  121         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
  122         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
  123         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
  124         DEVMETHOD(bus_get_resource_list, localbus_get_resource_list),
  125 
  126         /* OFW bus interface */
  127         DEVMETHOD(ofw_bus_get_devinfo,  localbus_get_devinfo),
  128         DEVMETHOD(ofw_bus_get_compat,   ofw_bus_gen_get_compat),
  129         DEVMETHOD(ofw_bus_get_model,    ofw_bus_gen_get_model),
  130         DEVMETHOD(ofw_bus_get_name,     ofw_bus_gen_get_name),
  131         DEVMETHOD(ofw_bus_get_node,     ofw_bus_gen_get_node),
  132         DEVMETHOD(ofw_bus_get_type,     ofw_bus_gen_get_type),
  133 
  134         { 0, 0 }
  135 };
  136 
  137 static driver_t localbus_driver = {
  138         "localbus",
  139         localbus_methods,
  140         sizeof(struct localbus_softc)
  141 };
  142 
  143 const struct localbus_va_entry localbus_virtmap[] = {
  144         {  0, MV_DEV_BOOT_BASE,         MV_DEV_BOOT_SIZE },
  145         {  1, MV_DEV_CS0_BASE,          MV_DEV_CS0_SIZE },
  146         {  2, MV_DEV_CS1_BASE,          MV_DEV_CS1_SIZE },
  147         {  3, MV_DEV_CS2_BASE,          MV_DEV_CS2_SIZE },
  148 
  149         { -1, 0, 0 }
  150 };
  151 
  152 static struct localbus_bank localbus_banks[MV_LOCALBUS_MAX_BANKS];
  153 
  154 devclass_t localbus_devclass;
  155 
  156 DRIVER_MODULE(localbus, fdtbus, localbus_driver, localbus_devclass, 0, 0);
  157 
  158 static int
  159 fdt_localbus_reg_decode(phandle_t node, struct localbus_softc *sc,
  160     struct localbus_devinfo *di)
  161 {
  162         u_long start, end, count;
  163         pcell_t *reg, *regptr;
  164         pcell_t addr_cells, size_cells;
  165         int tuple_size, tuples;
  166         int i, rv, bank;
  167 
  168         if (fdt_addrsize_cells(OF_parent(node), &addr_cells, &size_cells) != 0)
  169                 return (ENXIO);
  170 
  171         tuple_size = sizeof(pcell_t) * (addr_cells + size_cells);
  172         tuples = OF_getprop_alloc(node, "reg", tuple_size, (void **)&reg);
  173         debugf("addr_cells = %d, size_cells = %d\n", addr_cells, size_cells);
  174         debugf("tuples = %d, tuple size = %d\n", tuples, tuple_size);
  175         if (tuples <= 0)
  176                 /* No 'reg' property in this node. */
  177                 return (0);
  178 
  179         regptr = reg;
  180         for (i = 0; i < tuples; i++) {
  181 
  182                 bank = fdt_data_get((void *)regptr, 1);
  183 
  184                 if (bank >= MV_LOCALBUS_MAX_BANKS) {
  185                         device_printf(sc->sc_dev, "bank number [%d] out of "
  186                             "range\n", bank);
  187                         continue;
  188                 }
  189 
  190                 /*
  191                  * If device doesn't have virtual to physical mapping don't add
  192                  * resources
  193                  */
  194                 if (!(sc->sc_banks[bank].mapped)) {
  195                         device_printf(sc->sc_dev, "device [%d]: missing memory "
  196                             "mapping\n", bank);
  197                         continue;
  198                 }
  199 
  200                 di->di_bank = bank;
  201                 regptr += 1;
  202 
  203                 /* Get address/size. */
  204                 rv = fdt_data_to_res(regptr, addr_cells - 1, size_cells, &start,
  205                     &count);
  206                 if (rv != 0) {
  207                         resource_list_free(&di->di_res);
  208                         goto out;
  209                 }
  210 
  211                 /* Check if enough amount of memory is mapped */
  212                 if (sc->sc_banks[bank].size < count) {
  213                         device_printf(sc->sc_dev, "device [%d]: not enough "
  214                             "memory reserved\n", bank);
  215                         continue;
  216                 }
  217 
  218                 regptr += addr_cells - 1 + size_cells;
  219 
  220                 /* Calculate address range relative to VA base. */
  221                 start = sc->sc_banks[bank].va + start;
  222                 end = start + count - 1;
  223 
  224                 debugf("reg addr bank = %d, start = %lx, end = %lx, "
  225                     "count = %lx\n", bank, start, end, count);
  226 
  227                 /* Use bank (CS) cell as rid. */
  228                 resource_list_add(&di->di_res, SYS_RES_MEMORY, di->di_bank,
  229                     start, end, count);
  230         }
  231         rv = 0;
  232 out:
  233         free(reg, M_OFWPROP);
  234         return (rv);
  235 }
  236 
  237 static int
  238 localbus_probe(device_t dev)
  239 {
  240 
  241         if (!ofw_bus_is_compatible_strict(dev, "mrvl,lbc"))
  242                 return (ENXIO);
  243 
  244         device_set_desc(dev, "Marvell device bus");
  245 
  246         return (BUS_PROBE_DEFAULT);
  247 }
  248 
  249 static int
  250 localbus_attach(device_t dev)
  251 {
  252         device_t dev_child;
  253         struct localbus_softc *sc;
  254         struct localbus_devinfo *di;
  255         phandle_t dt_node, dt_child;
  256 
  257         sc = device_get_softc(dev);
  258         sc->sc_dev = dev;
  259         sc->sc_banks = localbus_banks;
  260 
  261         /*
  262          * Walk localbus and add direct subordinates as our children.
  263          */
  264         dt_node = ofw_bus_get_node(dev);
  265         for (dt_child = OF_child(dt_node); dt_child != 0;
  266             dt_child = OF_peer(dt_child)) {
  267 
  268                 /* Check and process 'status' property. */
  269                 if (!(fdt_is_enabled(dt_child)))
  270                         continue;
  271 
  272                 if (!(fdt_pm_is_enabled(dt_child)))
  273                         continue;
  274 
  275                 di = malloc(sizeof(*di), M_LOCALBUS, M_WAITOK | M_ZERO);
  276                 if (ofw_bus_gen_setup_devinfo(&di->di_ofw, dt_child) != 0) {
  277                         free(di, M_LOCALBUS);
  278                         device_printf(dev, "could not set up devinfo\n");
  279                         continue;
  280                 }
  281 
  282                 resource_list_init(&di->di_res);
  283                 if (fdt_localbus_reg_decode(dt_child, sc, di)) {
  284                         device_printf(dev, "could not process 'reg' "
  285                             "property\n");
  286                         ofw_bus_gen_destroy_devinfo(&di->di_ofw);
  287                         free(di, M_LOCALBUS);
  288                         continue;
  289                 }
  290 
  291                 /* Add newbus device for this FDT node */
  292                 dev_child = device_add_child(dev, NULL, -1);
  293                 if (dev_child == NULL) {
  294                         device_printf(dev, "could not add child: %s\n",
  295                             di->di_ofw.obd_name);
  296                         resource_list_free(&di->di_res);
  297                         ofw_bus_gen_destroy_devinfo(&di->di_ofw);
  298                         free(di, M_LOCALBUS);
  299                         continue;
  300                 }
  301 #ifdef DEBUG
  302                 device_printf(dev, "added child: %s\n\n", di->di_ofw.obd_name);
  303 #endif
  304                 device_set_ivars(dev_child, di);
  305         }
  306 
  307         return (bus_generic_attach(dev));
  308 }
  309 
  310 static int
  311 localbus_print_child(device_t dev, device_t child)
  312 {
  313         struct localbus_devinfo *di;
  314         struct resource_list *rl;
  315         int rv;
  316 
  317         di = device_get_ivars(child);
  318         rl = &di->di_res;
  319 
  320         rv = 0;
  321         rv += bus_print_child_header(dev, child);
  322         rv += resource_list_print_type(rl, "mem", SYS_RES_MEMORY, "%#lx");
  323         rv += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
  324         rv += bus_print_child_footer(dev, child);
  325 
  326         return (rv);
  327 }
  328 
  329 static struct resource *
  330 localbus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  331     u_long start, u_long end, u_long count, u_int flags)
  332 {
  333         struct localbus_devinfo *di;
  334         struct resource_list_entry *rle;
  335 
  336         /*
  337          * Request for the default allocation with a given rid: use resource
  338          * list stored in the local device info.
  339          */
  340         if ((start == 0UL) && (end == ~0UL)) {
  341                 if ((di = device_get_ivars(child)) == NULL)
  342                         return (NULL);
  343 
  344                 if (type == SYS_RES_IOPORT)
  345                         type = SYS_RES_MEMORY;
  346 
  347                 rid = &di->di_bank;
  348                 rle = resource_list_find(&di->di_res, type, *rid);
  349                 if (rle == NULL) {
  350                         device_printf(bus, "no default resources for "
  351                             "rid = %d, type = %d\n", *rid, type);
  352                         return (NULL);
  353                 }
  354                 start = rle->start;
  355                 end = rle->end;
  356                 count = rle->count;
  357         }
  358 
  359         return (bus_generic_alloc_resource(bus, child, type, rid, start, end,
  360             count, flags));
  361 }
  362 
  363 
  364 static struct resource_list *
  365 localbus_get_resource_list(device_t bus, device_t child)
  366 {
  367         struct localbus_devinfo *di;
  368 
  369         di = device_get_ivars(child);
  370         return (&di->di_res);
  371 }
  372 
  373 static const struct ofw_bus_devinfo *
  374 localbus_get_devinfo(device_t bus, device_t child)
  375 {
  376         struct localbus_devinfo *di;
  377 
  378         di = device_get_ivars(child);
  379         return (&di->di_ofw);
  380 }
  381 
  382 int
  383 fdt_localbus_devmap(phandle_t dt_node, struct pmap_devmap *fdt_devmap,
  384     int banks_max_num, int *banks_added)
  385 {
  386         pcell_t ranges[MV_LOCALBUS_MAX_BANKS * MV_LOCALBUS_MAX_BANK_CELLS];
  387         pcell_t *rangesptr;
  388         uint32_t tuple_size, bank;
  389         vm_paddr_t offset;
  390         vm_size_t size;
  391         int dev_num, addr_cells, size_cells, par_addr_cells, va_index, i, j, k;
  392 
  393         if ((fdt_addrsize_cells(dt_node, &addr_cells, &size_cells)) != 0)
  394                 return (EINVAL);
  395 
  396         par_addr_cells = fdt_parent_addr_cells(dt_node);
  397         if (par_addr_cells > 2) {
  398                 /*
  399                  * Localbus devmap initialization error: unsupported parent
  400                  * #addr-cells
  401                  */
  402                 return (ERANGE);
  403         }
  404 
  405         tuple_size = (addr_cells + par_addr_cells + size_cells);
  406         if (tuple_size > MV_LOCALBUS_MAX_BANK_CELLS)
  407                 return (ERANGE);
  408 
  409         tuple_size *= sizeof(pcell_t);
  410 
  411         dev_num = OF_getprop(dt_node, "ranges", ranges, sizeof(ranges));
  412         if (dev_num <= 0)
  413                 return (EINVAL);
  414 
  415         /* Calculate number of devices attached to bus */
  416         dev_num = dev_num / tuple_size;
  417 
  418         /*
  419          * If number of ranges > max number of localbus devices,
  420          * additional entries will not be processed
  421          */
  422         dev_num = MIN(dev_num, banks_max_num);
  423 
  424         rangesptr = &ranges[0];
  425         j = 0;
  426 
  427         /* Process data from FDT */
  428         for (i = 0; i < dev_num; i++) {
  429 
  430                 /* First field is bank number */
  431                 bank = fdt_data_get((void *)rangesptr, 1);
  432                 rangesptr += 1;
  433 
  434                 if (bank < 0 || bank > MV_LOCALBUS_MAX_BANKS) {
  435                         /* Bank out of range */
  436                         rangesptr += ((addr_cells - 1) + par_addr_cells +
  437                             size_cells);
  438                         continue;
  439                 }
  440 
  441                 /* Find virtmap entry for this bank */
  442                 va_index = -1;
  443                 for (k = 0; localbus_virtmap[k].bank >= 0; k++) {
  444                         if (localbus_virtmap[k].bank == bank) {
  445                                 va_index = k;
  446                                 break;
  447                         }
  448                 }
  449 
  450                 /* Check if virtmap entry was found */
  451                 if (va_index == -1) {
  452                         rangesptr += ((addr_cells - 1) + par_addr_cells +
  453                             size_cells);
  454                         continue;
  455                 }
  456 
  457                 /* Remaining child's address fields are unused */
  458                 rangesptr += (addr_cells - 1);
  459 
  460                 /* Parent address offset */
  461                 offset = fdt_data_get((void *)rangesptr, par_addr_cells);
  462                 rangesptr += par_addr_cells;
  463 
  464                 /* Last field is size */
  465                 size = fdt_data_get((void *)rangesptr, size_cells);
  466                 rangesptr += size_cells;
  467 
  468                 if (size > localbus_virtmap[va_index].size) {
  469                         /* Not enough space reserved in virtual memory map */
  470                         continue;
  471                 }
  472 
  473                 fdt_devmap[j].pd_va = localbus_virtmap[va_index].va;
  474                 fdt_devmap[j].pd_pa = offset;
  475                 fdt_devmap[j].pd_size = size;
  476                 fdt_devmap[j].pd_prot = VM_PROT_READ | VM_PROT_WRITE;
  477                 fdt_devmap[j].pd_cache = PTE_NOCACHE;
  478 
  479                 /* Copy data to structure used by localbus driver */
  480                 localbus_banks[bank].va = fdt_devmap[j].pd_va;
  481                 localbus_banks[bank].pa = fdt_devmap[j].pd_pa;
  482                 localbus_banks[bank].size = fdt_devmap[j].pd_size;
  483                 localbus_banks[bank].mapped = 1;
  484 
  485                 j++;
  486         }
  487 
  488         *banks_added = j;
  489         return (0);
  490 }

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