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: stable/10/sys/arm/mv/mv_localbus.c 266386 2014-05-18 00:32:35Z ian $");
   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 <vm/vm.h>
   41 
   42 #include <machine/devmap.h>
   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/mvwin.h>
   53 
   54 #ifdef DEBUG
   55 #define debugf(fmt, args...) do { printf("%s(): ", __func__);   \
   56     printf(fmt,##args); } while (0)
   57 #else
   58 #define debugf(fmt, args...)
   59 #endif
   60 
   61 #define MV_LOCALBUS_MAX_BANKS           8
   62 #define MV_LOCALBUS_MAX_BANK_CELLS      4
   63 
   64 static MALLOC_DEFINE(M_LOCALBUS, "localbus", "localbus devices information");
   65 
   66 struct localbus_bank {
   67         vm_offset_t     va;             /* VA of the bank */
   68         vm_paddr_t      pa;             /* physical address of the bank */
   69         vm_size_t       size;           /* bank size */
   70         uint8_t         mapped;         /* device memory has mapping */
   71 };
   72 
   73 struct localbus_softc {
   74         device_t                sc_dev;
   75         bus_space_handle_t      sc_bsh;
   76         bus_space_tag_t         sc_bst;
   77         int                     sc_rid;
   78 
   79         struct localbus_bank    *sc_banks;
   80 };
   81 
   82 struct localbus_devinfo {
   83         struct ofw_bus_devinfo  di_ofw;
   84         struct resource_list    di_res;
   85         int                     di_bank;
   86 };
   87 
   88 struct localbus_va_entry {
   89         int8_t          bank;
   90         vm_offset_t     va;
   91         vm_size_t       size;
   92 };
   93 
   94 /*
   95  * Prototypes.
   96  */
   97 static int localbus_probe(device_t);
   98 static int localbus_attach(device_t);
   99 static int localbus_print_child(device_t, device_t);
  100 
  101 static struct resource *localbus_alloc_resource(device_t, device_t, int,
  102     int *, u_long, u_long, u_long, u_int);
  103 static struct resource_list *localbus_get_resource_list(device_t, device_t);
  104 
  105 static ofw_bus_get_devinfo_t localbus_get_devinfo;
  106 
  107 /*
  108  * Bus interface definition.
  109  */
  110 static device_method_t localbus_methods[] = {
  111         /* Device interface */
  112         DEVMETHOD(device_probe,         localbus_probe),
  113         DEVMETHOD(device_attach,        localbus_attach),
  114         DEVMETHOD(device_detach,        bus_generic_detach),
  115         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  116         DEVMETHOD(device_suspend,       bus_generic_suspend),
  117         DEVMETHOD(device_resume,        bus_generic_resume),
  118 
  119         /* Bus interface */
  120         DEVMETHOD(bus_print_child,      localbus_print_child),
  121         DEVMETHOD(bus_alloc_resource,   localbus_alloc_resource),
  122         DEVMETHOD(bus_release_resource, bus_generic_release_resource),
  123         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
  124         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
  125         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
  126         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
  127         DEVMETHOD(bus_get_resource_list, localbus_get_resource_list),
  128 
  129         /* OFW bus interface */
  130         DEVMETHOD(ofw_bus_get_devinfo,  localbus_get_devinfo),
  131         DEVMETHOD(ofw_bus_get_compat,   ofw_bus_gen_get_compat),
  132         DEVMETHOD(ofw_bus_get_model,    ofw_bus_gen_get_model),
  133         DEVMETHOD(ofw_bus_get_name,     ofw_bus_gen_get_name),
  134         DEVMETHOD(ofw_bus_get_node,     ofw_bus_gen_get_node),
  135         DEVMETHOD(ofw_bus_get_type,     ofw_bus_gen_get_type),
  136 
  137         { 0, 0 }
  138 };
  139 
  140 static driver_t localbus_driver = {
  141         "localbus",
  142         localbus_methods,
  143         sizeof(struct localbus_softc)
  144 };
  145 
  146 const struct localbus_va_entry localbus_virtmap[] = {
  147         {  0, MV_DEV_BOOT_BASE,         MV_DEV_BOOT_SIZE },
  148         {  1, MV_DEV_CS0_BASE,          MV_DEV_CS0_SIZE },
  149         {  2, MV_DEV_CS1_BASE,          MV_DEV_CS1_SIZE },
  150         {  3, MV_DEV_CS2_BASE,          MV_DEV_CS2_SIZE },
  151 
  152         { -1, 0, 0 }
  153 };
  154 
  155 static struct localbus_bank localbus_banks[MV_LOCALBUS_MAX_BANKS];
  156 
  157 devclass_t localbus_devclass;
  158 
  159 DRIVER_MODULE(localbus, ofwbus, localbus_driver, localbus_devclass, 0, 0);
  160 
  161 static int
  162 fdt_localbus_reg_decode(phandle_t node, struct localbus_softc *sc,
  163     struct localbus_devinfo *di)
  164 {
  165         u_long start, end, count;
  166         pcell_t *reg, *regptr;
  167         pcell_t addr_cells, size_cells;
  168         int tuple_size, tuples;
  169         int i, rv, bank;
  170 
  171         if (fdt_addrsize_cells(OF_parent(node), &addr_cells, &size_cells) != 0)
  172                 return (ENXIO);
  173 
  174         tuple_size = sizeof(pcell_t) * (addr_cells + size_cells);
  175         tuples = OF_getprop_alloc(node, "reg", tuple_size, (void **)&reg);
  176         debugf("addr_cells = %d, size_cells = %d\n", addr_cells, size_cells);
  177         debugf("tuples = %d, tuple size = %d\n", tuples, tuple_size);
  178         if (tuples <= 0)
  179                 /* No 'reg' property in this node. */
  180                 return (0);
  181 
  182         regptr = reg;
  183         for (i = 0; i < tuples; i++) {
  184 
  185                 bank = fdt_data_get((void *)regptr, 1);
  186 
  187                 if (bank >= MV_LOCALBUS_MAX_BANKS) {
  188                         device_printf(sc->sc_dev, "bank number [%d] out of "
  189                             "range\n", bank);
  190                         continue;
  191                 }
  192 
  193                 /*
  194                  * If device doesn't have virtual to physical mapping don't add
  195                  * resources
  196                  */
  197                 if (!(sc->sc_banks[bank].mapped)) {
  198                         device_printf(sc->sc_dev, "device [%d]: missing memory "
  199                             "mapping\n", bank);
  200                         continue;
  201                 }
  202 
  203                 di->di_bank = bank;
  204                 regptr += 1;
  205 
  206                 /* Get address/size. */
  207                 rv = fdt_data_to_res(regptr, addr_cells - 1, size_cells, &start,
  208                     &count);
  209                 if (rv != 0) {
  210                         resource_list_free(&di->di_res);
  211                         goto out;
  212                 }
  213 
  214                 /* Check if enough amount of memory is mapped */
  215                 if (sc->sc_banks[bank].size < count) {
  216                         device_printf(sc->sc_dev, "device [%d]: not enough "
  217                             "memory reserved\n", bank);
  218                         continue;
  219                 }
  220 
  221                 regptr += addr_cells - 1 + size_cells;
  222 
  223                 /* Calculate address range relative to VA base. */
  224                 start = sc->sc_banks[bank].va + start;
  225                 end = start + count - 1;
  226 
  227                 debugf("reg addr bank = %d, start = %lx, end = %lx, "
  228                     "count = %lx\n", bank, start, end, count);
  229 
  230                 /* Use bank (CS) cell as rid. */
  231                 resource_list_add(&di->di_res, SYS_RES_MEMORY, di->di_bank,
  232                     start, end, count);
  233         }
  234         rv = 0;
  235 out:
  236         free(reg, M_OFWPROP);
  237         return (rv);
  238 }
  239 
  240 static int
  241 localbus_probe(device_t dev)
  242 {
  243 
  244         if (!ofw_bus_is_compatible_strict(dev, "mrvl,lbc"))
  245                 return (ENXIO);
  246 
  247         device_set_desc(dev, "Marvell device bus");
  248 
  249         return (BUS_PROBE_DEFAULT);
  250 }
  251 
  252 static int
  253 localbus_attach(device_t dev)
  254 {
  255         device_t dev_child;
  256         struct localbus_softc *sc;
  257         struct localbus_devinfo *di;
  258         phandle_t dt_node, dt_child;
  259 
  260         sc = device_get_softc(dev);
  261         sc->sc_dev = dev;
  262         sc->sc_banks = localbus_banks;
  263 
  264         /*
  265          * Walk localbus and add direct subordinates as our children.
  266          */
  267         dt_node = ofw_bus_get_node(dev);
  268         for (dt_child = OF_child(dt_node); dt_child != 0;
  269             dt_child = OF_peer(dt_child)) {
  270 
  271                 /* Check and process 'status' property. */
  272                 if (!(fdt_is_enabled(dt_child)))
  273                         continue;
  274 
  275                 if (!(fdt_pm_is_enabled(dt_child)))
  276                         continue;
  277 
  278                 di = malloc(sizeof(*di), M_LOCALBUS, M_WAITOK | M_ZERO);
  279                 if (ofw_bus_gen_setup_devinfo(&di->di_ofw, dt_child) != 0) {
  280                         free(di, M_LOCALBUS);
  281                         device_printf(dev, "could not set up devinfo\n");
  282                         continue;
  283                 }
  284 
  285                 resource_list_init(&di->di_res);
  286                 if (fdt_localbus_reg_decode(dt_child, sc, di)) {
  287                         device_printf(dev, "could not process 'reg' "
  288                             "property\n");
  289                         ofw_bus_gen_destroy_devinfo(&di->di_ofw);
  290                         free(di, M_LOCALBUS);
  291                         continue;
  292                 }
  293 
  294                 /* Add newbus device for this FDT node */
  295                 dev_child = device_add_child(dev, NULL, -1);
  296                 if (dev_child == NULL) {
  297                         device_printf(dev, "could not add child: %s\n",
  298                             di->di_ofw.obd_name);
  299                         resource_list_free(&di->di_res);
  300                         ofw_bus_gen_destroy_devinfo(&di->di_ofw);
  301                         free(di, M_LOCALBUS);
  302                         continue;
  303                 }
  304 #ifdef DEBUG
  305                 device_printf(dev, "added child: %s\n\n", di->di_ofw.obd_name);
  306 #endif
  307                 device_set_ivars(dev_child, di);
  308         }
  309 
  310         return (bus_generic_attach(dev));
  311 }
  312 
  313 static int
  314 localbus_print_child(device_t dev, device_t child)
  315 {
  316         struct localbus_devinfo *di;
  317         struct resource_list *rl;
  318         int rv;
  319 
  320         di = device_get_ivars(child);
  321         rl = &di->di_res;
  322 
  323         rv = 0;
  324         rv += bus_print_child_header(dev, child);
  325         rv += resource_list_print_type(rl, "mem", SYS_RES_MEMORY, "%#lx");
  326         rv += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
  327         rv += bus_print_child_footer(dev, child);
  328 
  329         return (rv);
  330 }
  331 
  332 static struct resource *
  333 localbus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  334     u_long start, u_long end, u_long count, u_int flags)
  335 {
  336         struct localbus_devinfo *di;
  337         struct resource_list_entry *rle;
  338 
  339         /*
  340          * Request for the default allocation with a given rid: use resource
  341          * list stored in the local device info.
  342          */
  343         if ((start == 0UL) && (end == ~0UL)) {
  344                 if ((di = device_get_ivars(child)) == NULL)
  345                         return (NULL);
  346 
  347                 if (type == SYS_RES_IOPORT)
  348                         type = SYS_RES_MEMORY;
  349 
  350                 rid = &di->di_bank;
  351                 rle = resource_list_find(&di->di_res, type, *rid);
  352                 if (rle == NULL) {
  353                         device_printf(bus, "no default resources for "
  354                             "rid = %d, type = %d\n", *rid, type);
  355                         return (NULL);
  356                 }
  357                 start = rle->start;
  358                 end = rle->end;
  359                 count = rle->count;
  360         }
  361 
  362         return (bus_generic_alloc_resource(bus, child, type, rid, start, end,
  363             count, flags));
  364 }
  365 
  366 
  367 static struct resource_list *
  368 localbus_get_resource_list(device_t bus, device_t child)
  369 {
  370         struct localbus_devinfo *di;
  371 
  372         di = device_get_ivars(child);
  373         return (&di->di_res);
  374 }
  375 
  376 static const struct ofw_bus_devinfo *
  377 localbus_get_devinfo(device_t bus, device_t child)
  378 {
  379         struct localbus_devinfo *di;
  380 
  381         di = device_get_ivars(child);
  382         return (&di->di_ofw);
  383 }
  384 
  385 int
  386 fdt_localbus_devmap(phandle_t dt_node, struct arm_devmap_entry *fdt_devmap,
  387     int banks_max_num, int *banks_added)
  388 {
  389         pcell_t ranges[MV_LOCALBUS_MAX_BANKS * MV_LOCALBUS_MAX_BANK_CELLS];
  390         pcell_t *rangesptr;
  391         uint32_t tuple_size, bank;
  392         vm_paddr_t offset;
  393         vm_size_t size;
  394         int dev_num, addr_cells, size_cells, par_addr_cells, va_index, i, j, k;
  395 
  396         if ((fdt_addrsize_cells(dt_node, &addr_cells, &size_cells)) != 0)
  397                 return (EINVAL);
  398 
  399         par_addr_cells = fdt_parent_addr_cells(dt_node);
  400         if (par_addr_cells > 2) {
  401                 /*
  402                  * Localbus devmap initialization error: unsupported parent
  403                  * #addr-cells
  404                  */
  405                 return (ERANGE);
  406         }
  407 
  408         tuple_size = (addr_cells + par_addr_cells + size_cells);
  409         if (tuple_size > MV_LOCALBUS_MAX_BANK_CELLS)
  410                 return (ERANGE);
  411 
  412         tuple_size *= sizeof(pcell_t);
  413 
  414         dev_num = OF_getprop(dt_node, "ranges", ranges, sizeof(ranges));
  415         if (dev_num <= 0)
  416                 return (EINVAL);
  417 
  418         /* Calculate number of devices attached to bus */
  419         dev_num = dev_num / tuple_size;
  420 
  421         /*
  422          * If number of ranges > max number of localbus devices,
  423          * additional entries will not be processed
  424          */
  425         dev_num = MIN(dev_num, banks_max_num);
  426 
  427         rangesptr = &ranges[0];
  428         j = 0;
  429 
  430         /* Process data from FDT */
  431         for (i = 0; i < dev_num; i++) {
  432 
  433                 /* First field is bank number */
  434                 bank = fdt_data_get((void *)rangesptr, 1);
  435                 rangesptr += 1;
  436 
  437                 if (bank < 0 || bank > MV_LOCALBUS_MAX_BANKS) {
  438                         /* Bank out of range */
  439                         rangesptr += ((addr_cells - 1) + par_addr_cells +
  440                             size_cells);
  441                         continue;
  442                 }
  443 
  444                 /* Find virtmap entry for this bank */
  445                 va_index = -1;
  446                 for (k = 0; localbus_virtmap[k].bank >= 0; k++) {
  447                         if (localbus_virtmap[k].bank == bank) {
  448                                 va_index = k;
  449                                 break;
  450                         }
  451                 }
  452 
  453                 /* Check if virtmap entry was found */
  454                 if (va_index == -1) {
  455                         rangesptr += ((addr_cells - 1) + par_addr_cells +
  456                             size_cells);
  457                         continue;
  458                 }
  459 
  460                 /* Remaining child's address fields are unused */
  461                 rangesptr += (addr_cells - 1);
  462 
  463                 /* Parent address offset */
  464                 offset = fdt_data_get((void *)rangesptr, par_addr_cells);
  465                 rangesptr += par_addr_cells;
  466 
  467                 /* Last field is size */
  468                 size = fdt_data_get((void *)rangesptr, size_cells);
  469                 rangesptr += size_cells;
  470 
  471                 if (size > localbus_virtmap[va_index].size) {
  472                         /* Not enough space reserved in virtual memory map */
  473                         continue;
  474                 }
  475 
  476                 fdt_devmap[j].pd_va = localbus_virtmap[va_index].va;
  477                 fdt_devmap[j].pd_pa = offset;
  478                 fdt_devmap[j].pd_size = size;
  479                 fdt_devmap[j].pd_prot = VM_PROT_READ | VM_PROT_WRITE;
  480                 fdt_devmap[j].pd_cache = PTE_DEVICE;
  481 
  482                 /* Copy data to structure used by localbus driver */
  483                 localbus_banks[bank].va = fdt_devmap[j].pd_va;
  484                 localbus_banks[bank].pa = fdt_devmap[j].pd_pa;
  485                 localbus_banks[bank].size = fdt_devmap[j].pd_size;
  486                 localbus_banks[bank].mapped = 1;
  487 
  488                 j++;
  489         }
  490 
  491         *banks_added = j;
  492         return (0);
  493 }

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