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/mips/atheros/ar71xx_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2009 Oleksandr Tymoshenko
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/12/sys/mips/atheros/ar71xx_machdep.c 336245 2018-07-13 16:43:17Z imp $");
   31 
   32 #include "opt_ddb.h"
   33 #include "opt_ar71xx.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/conf.h>
   37 #include <sys/kernel.h>
   38 #include <sys/systm.h>
   39 #include <sys/bus.h>
   40 #include <sys/cons.h>
   41 #include <sys/kdb.h>
   42 #include <sys/boot.h>
   43 #include <sys/reboot.h>
   44 
   45 #include <vm/vm.h>
   46 #include <vm/vm_page.h>
   47 
   48 #include <net/ethernet.h>
   49 
   50 #include <machine/clock.h>
   51 #include <machine/cpu.h>
   52 #include <machine/cpuregs.h>
   53 #include <machine/hwfunc.h>
   54 #include <machine/md_var.h>
   55 #include <machine/trap.h>
   56 #include <machine/vmparam.h>
   57 
   58 #include <mips/atheros/ar71xxreg.h>
   59 
   60 #include <mips/atheros/ar71xx_setup.h>
   61 #include <mips/atheros/ar71xx_cpudef.h>
   62 #include <mips/atheros/ar71xx_macaddr.h>
   63 
   64 extern char edata[], end[];
   65 
   66 /* 4KB static data aread to keep a copy of the bootload env until
   67    the dynamic kenv is setup */
   68 char boot1_env[4096];
   69 
   70 void
   71 platform_cpu_init()
   72 {
   73         /* Nothing special */
   74 }
   75 
   76 void
   77 platform_reset(void)
   78 {
   79         ar71xx_device_stop(RST_RESET_FULL_CHIP);
   80         /* Wait for reset */
   81         while(1)
   82                 ;
   83 }
   84 
   85 /*
   86  * Obtain the MAC address via the Redboot environment.
   87  */
   88 static int
   89 ar71xx_redboot_get_macaddr(void)
   90 {
   91         char *var;
   92         int count = 0, i;
   93         uint32_t macaddr[ETHER_ADDR_LEN];
   94         uint8_t tmpmac[ETHER_ADDR_LEN];
   95 
   96         /*
   97          * "ethaddr" is passed via envp on RedBoot platforms
   98          * "kmac" is passed via argv on RouterBOOT platforms
   99          */
  100         if ((var = kern_getenv("ethaddr")) != NULL ||
  101             (var = kern_getenv("kmac")) != NULL) {
  102                 count = sscanf(var, "%x%*c%x%*c%x%*c%x%*c%x%*c%x",
  103                     &macaddr[0], &macaddr[1],
  104                     &macaddr[2], &macaddr[3],
  105                     &macaddr[4], &macaddr[5]);
  106 
  107                 if (count < 6) {
  108                         memset(macaddr, 0,
  109                             sizeof(macaddr));
  110                 } else {
  111                         for (i = 0; i < ETHER_ADDR_LEN; i++)
  112                                 tmpmac[i] = macaddr[i] & 0xff;
  113                         (void) ar71xx_mac_addr_init(ar71xx_board_mac_addr,
  114                             tmpmac,
  115                             0, /* offset */
  116                             0); /* is_local */
  117                 }
  118                 freeenv(var);
  119                 return (0);
  120         }
  121         return (-1);
  122 }
  123 
  124 #ifdef  AR71XX_ENV_ROUTERBOOT
  125 /*
  126  * RouterBoot gives us the board memory in a command line argument.
  127  */
  128 static int
  129 ar71xx_routerboot_get_mem(int argc, char **argv)
  130 {
  131         int i, board_mem;
  132 
  133         /*
  134          * Protect ourselves from garbage in registers.
  135          */
  136         if (!MIPS_IS_VALID_PTR(argv))
  137                 return (0);
  138 
  139         for (i = 0; i < argc; i++) {
  140                 if (argv[i] == NULL)
  141                         continue;
  142                 if (strncmp(argv[i], "mem=", 4) == 0) {
  143                         if (sscanf(argv[i] + 4, "%dM", &board_mem) == 1)
  144                                 return (btoc(board_mem * 1024 * 1024));
  145                 }
  146         }
  147 
  148         return (0);
  149 }
  150 #endif
  151 
  152 /*
  153  * Handle initialising the MAC address from a specific EEPROM
  154  * offset.
  155  *
  156  * This is done during (very) early boot.
  157  *
  158  * hint.ar71xx.0.eeprom_mac_addr=<address to read from>
  159  * hint.ar71xx.0.eeprom_mac_isascii=<0|1>
  160  */
  161 static int
  162 ar71xx_platform_read_eeprom_mac(void)
  163 {
  164         long eeprom_mac_addr = 0;
  165         const char *mac;
  166         int i, readascii = 0;
  167         uint8_t macaddr[ETHER_ADDR_LEN];
  168 
  169         if (resource_long_value("ar71xx", 0, "eeprom_mac_addr",
  170             &eeprom_mac_addr) != 0)
  171                 return (-1);
  172 
  173         /* get a pointer to the EEPROM MAC address */
  174 
  175         mac = (const char *) MIPS_PHYS_TO_KSEG1(eeprom_mac_addr);
  176 
  177         /* Check if it's ASCII or not */
  178         if (resource_int_value("ar71xx", 0, "eeprom_mac_isascii",
  179             &readascii) == 0 && readascii == 1) {
  180                 printf("ar71xx: Overriding MAC from EEPROM (ascii)\n");
  181                 for (i = 0; i < 6; i++) {
  182                         macaddr[i] = strtol(&(mac[i*3]), NULL, 16);
  183                 }
  184         } else {
  185                 printf("ar71xx: Overriding MAC from EEPROM\n");
  186                 for (i = 0; i < 6; i++) {
  187                         macaddr[i] = mac[i];
  188                 }
  189         }
  190 
  191         /* Set the default board MAC */
  192         (void) ar71xx_mac_addr_init(ar71xx_board_mac_addr,
  193             macaddr,
  194             0, /* offset */
  195             0); /* is_local */
  196         printf("ar71xx: Board MAC: %6D\n", ar71xx_board_mac_addr, ":");
  197         return (0);
  198 }
  199 
  200 /*
  201  * Populate a kenv hint for the given device based on the given
  202  * MAC address and offset.
  203  *
  204  * Returns 0 if ok, < 0 on error.
  205  */
  206 static int
  207 ar71xx_platform_set_mac_hint(const char *dev, int unit,
  208     const uint8_t *macaddr, int offset, int islocal)
  209 {
  210         char macstr[32];
  211         uint8_t lclmac[ETHER_ADDR_LEN];
  212         char devstr[32];
  213 
  214         /* Initialise the MAC address, plus/minus the offset */
  215         if (ar71xx_mac_addr_init(lclmac, macaddr, offset, islocal) != 0) {
  216                 return (-1);
  217         }
  218 
  219         /* Turn it into a string */
  220         snprintf(macstr, 32, "%6D", lclmac, ":");
  221         snprintf(devstr, 32, "hint.%s.%d.macaddr", dev, unit);
  222 
  223         printf("  %s => %s\n", devstr, macstr);
  224 
  225         /* Call setenv */
  226         if (kern_setenv(devstr, macstr) != 0) {
  227                 printf("%s: failed to set hint (%s => %s)\n",
  228                     __func__,
  229                     devstr,
  230                     macstr);
  231                 return (-1);
  232         }
  233 
  234         return (0);
  235 }
  236 
  237 /*
  238  * Iterate through the list of boot time hints that populate
  239  * a device MAC address hint based on the "board" MAC address.
  240  *
  241  * ar71xx_mac_map.X.devid=<device id, eg ath>
  242  * ar71xx_mac_map.X.unitid=<unit id, eg 0>
  243  * ar71xx_mac_map.X.offset=<mac address value offset>
  244  * ar71xx_mac_map.X.is_local=<1 or 0>
  245  */
  246 static int
  247 ar71xx_platform_check_mac_hints(void)
  248 {
  249         int i;
  250         const char *devid;
  251         int offset, is_local, unitid;
  252 
  253         for (i = 0; i < 8; i++) {
  254                 if (resource_string_value("ar71xx_mac_map", i, "devid",
  255                     &devid) != 0)
  256                         break;
  257                 if (resource_int_value("ar71xx_mac_map", i, "unitid",
  258                     &unitid) != 0)
  259                         break;
  260                 if (resource_int_value("ar71xx_mac_map", i, "offset",
  261                     &offset) != 0)
  262                         break;
  263                 if (resource_int_value("ar71xx_mac_map", i, "is_local",
  264                     &is_local) != 0)
  265                         break;
  266                 printf("ar71xx: devid '%s.%d', MAC offset '%d'\n",
  267                     devid, unitid, offset);
  268                 (void) ar71xx_platform_set_mac_hint(devid, unitid,
  269                     ar71xx_board_mac_addr, offset, is_local);
  270         }
  271 
  272         return (0);
  273 }
  274 
  275 extern char cpu_model[];
  276 
  277 void
  278 platform_start(__register_t a0 __unused, __register_t a1 __unused, 
  279     __register_t a2 __unused, __register_t a3 __unused)
  280 {
  281         uint64_t platform_counter_freq;
  282         int argc = 0, i;
  283         char **argv = NULL, **envp = NULL;
  284         vm_offset_t kernend;
  285 
  286         /* 
  287          * clear the BSS and SBSS segments, this should be first call in
  288          * the function
  289          */
  290         kernend = (vm_offset_t)&end;
  291         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  292 
  293         mips_postboot_fixup();
  294 
  295         /* Initialize pcpu stuff */
  296         mips_pcpu0_init();
  297 
  298         /*
  299          * Until some more sensible abstractions for uboot/redboot
  300          * environment handling, we have to make this a compile-time
  301          * hack.  The existing code handles the uboot environment
  302          * very incorrectly so we should just ignore initialising
  303          * the relevant pointers.
  304          */
  305 #ifndef AR71XX_ENV_UBOOT
  306         argc = a0;
  307         argv = (char**)a1;
  308         envp = (char**)a2;
  309 #endif
  310         /* 
  311          * Protect ourselves from garbage in registers 
  312          */
  313         if (MIPS_IS_VALID_PTR(envp)) {
  314                 for (i = 0; envp[i]; i += 2) {
  315                         if (strcmp(envp[i], "memsize") == 0)
  316                                 realmem = btoc(strtoul(envp[i+1], NULL, 16));
  317                         else if (strcmp(envp[i], "bootverbose") == 0)
  318                                 bootverbose = btoc(strtoul(envp[i+1], NULL, 10));
  319                 }
  320         }
  321         bootverbose = 1;
  322 
  323 #ifdef  AR71XX_ENV_ROUTERBOOT
  324         /*
  325          * RouterBoot informs the board memory as a command line argument.
  326          */
  327         if (realmem == 0)
  328                 realmem = ar71xx_routerboot_get_mem(argc, argv);
  329 #endif
  330 
  331         /*
  332          * Just wild guess. RedBoot let us down and didn't reported 
  333          * memory size
  334          */
  335         if (realmem == 0)
  336                 realmem = btoc(32*1024*1024);
  337 
  338         /*
  339          * Allow build-time override in case Redboot lies
  340          * or in other situations (eg where there's u-boot)
  341          * where there isn't (yet) a convienent method of
  342          * being told how much RAM is available.
  343          *
  344          * This happens on at least the Ubiquiti LS-SR71A
  345          * board, where redboot says there's 16mb of RAM
  346          * but in fact there's 32mb.
  347          */
  348 #if     defined(AR71XX_REALMEM)
  349                 realmem = btoc(AR71XX_REALMEM);
  350 #endif
  351 
  352         /* phys_avail regions are in bytes */
  353         phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
  354         phys_avail[1] = ctob(realmem);
  355 
  356         dump_avail[0] = 0;
  357         dump_avail[1] = phys_avail[1];
  358 
  359         physmem = realmem;
  360 
  361         /*
  362          * ns8250 uart code uses DELAY so ticker should be inititalized 
  363          * before cninit. And tick_init_params refers to hz, so * init_param1 
  364          * should be called first.
  365          */
  366         init_param1();
  367 
  368         /* Detect the system type - this is needed for subsequent chipset-specific calls */
  369         ar71xx_detect_sys_type();
  370         ar71xx_detect_sys_frequency();
  371 
  372         platform_counter_freq = ar71xx_cpu_freq();
  373         mips_timer_init_params(platform_counter_freq, 1);
  374         cninit();
  375         init_static_kenv(boot1_env, sizeof(boot1_env));
  376 
  377         printf("CPU platform: %s\n", ar71xx_get_system_type());
  378         printf("CPU Frequency=%d MHz\n", u_ar71xx_cpu_freq / 1000000);
  379         printf("CPU DDR Frequency=%d MHz\n", u_ar71xx_ddr_freq / 1000000);
  380         printf("CPU AHB Frequency=%d MHz\n", u_ar71xx_ahb_freq / 1000000);
  381         printf("platform frequency: %lld MHz\n", platform_counter_freq / 1000000);
  382         printf("CPU reference clock: %d MHz\n", u_ar71xx_refclk / 1000000);
  383         printf("CPU MDIO clock: %d MHz\n", u_ar71xx_mdio_freq / 1000000);
  384         printf("arguments: \n");
  385         printf("  a0 = %08x\n", a0);
  386         printf("  a1 = %08x\n", a1);
  387         printf("  a2 = %08x\n", a2);
  388         printf("  a3 = %08x\n", a3);
  389 
  390         strcpy(cpu_model, ar71xx_get_system_type());
  391 
  392         /*
  393          * XXX this code is very redboot specific.
  394          */
  395         printf("Cmd line:");
  396         if (MIPS_IS_VALID_PTR(argv)) {
  397                 for (i = 0; i < argc; i++) {
  398                         printf(" %s", argv[i]);
  399                         boothowto |= boot_parse_arg(argv[i]);
  400                 }
  401         }
  402         else
  403                 printf ("argv is invalid");
  404         printf("\n");
  405 
  406         printf("Environment:\n");
  407         if (MIPS_IS_VALID_PTR(envp)) {
  408                 for (i = 0; envp[i]; i+=2) {
  409                         printf("  %s = %s\n", envp[i], envp[i+1]);
  410                         kern_setenv(envp[i], envp[i+1]);
  411                 }
  412         }
  413         else 
  414                 printf ("envp is invalid\n");
  415 
  416         /* Platform setup */
  417         init_param2(physmem);
  418         mips_cpu_init();
  419         pmap_bootstrap();
  420         mips_proc0_init();
  421         mutex_init();
  422 
  423         /*
  424          * Reset USB devices 
  425          */
  426         ar71xx_init_usb_peripheral();
  427 
  428         /*
  429          * Reset internal ethernet switch, if one exists
  430          */
  431         ar71xx_reset_ethernet_switch();
  432 
  433         /*
  434          * Initialise the gmac driver.
  435          */
  436         ar71xx_init_gmac();
  437 
  438         /* Redboot if_arge MAC address is in the environment */
  439         (void) ar71xx_redboot_get_macaddr();
  440 
  441         /* Various other boards need things to come out of EEPROM */
  442         (void) ar71xx_platform_read_eeprom_mac();
  443 
  444         /* Initialise the MAC address hint map */
  445         ar71xx_platform_check_mac_hints();
  446 
  447         kdb_init();
  448 #ifdef KDB
  449         if (boothowto & RB_KDB)
  450                 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  451 #endif
  452 }

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