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  * Copyright (c) 2009 Oleksandr Tymoshenko
    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/10.2/sys/mips/atheros/ar71xx_machdep.c 248865 2013-03-29 06:31:31Z adrian $");
   29 
   30 #include "opt_ddb.h"
   31 #include "opt_ar71xx.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/conf.h>
   35 #include <sys/kernel.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <sys/cons.h>
   39 #include <sys/kdb.h>
   40 #include <sys/reboot.h>
   41 
   42 #include <vm/vm.h>
   43 #include <vm/vm_page.h>
   44 
   45 #include <net/ethernet.h>
   46 
   47 #include <machine/clock.h>
   48 #include <machine/cpu.h>
   49 #include <machine/cpuregs.h>
   50 #include <machine/hwfunc.h>
   51 #include <machine/md_var.h>
   52 #include <machine/trap.h>
   53 #include <machine/vmparam.h>
   54 
   55 #include <mips/atheros/ar71xxreg.h>
   56 
   57 #include <mips/atheros/ar71xx_setup.h>
   58 #include <mips/atheros/ar71xx_cpudef.h>
   59 
   60 #include <mips/sentry5/s5reg.h>
   61 
   62 extern char edata[], end[];
   63 
   64 uint32_t ar711_base_mac[ETHER_ADDR_LEN];
   65 /* 4KB static data aread to keep a copy of the bootload env until
   66    the dynamic kenv is setup */
   67 char boot1_env[4096];
   68 
   69 /*
   70  * We get a string in from Redboot with the all the arguments together,
   71  * "foo=bar bar=baz". Split them up and save in kenv.
   72  */
   73 static void
   74 parse_argv(char *str)
   75 {
   76         char *n, *v;
   77 
   78         while ((v = strsep(&str, " ")) != NULL) {
   79                 if (*v == '\0')
   80                         continue;
   81                 if (*v == '-') {
   82                         while (*v != '\0') {
   83                                 v++;
   84                                 switch (*v) {
   85                                 case 'a': boothowto |= RB_ASKNAME; break;
   86                                 case 'd': boothowto |= RB_KDB; break;
   87                                 case 'g': boothowto |= RB_GDB; break;
   88                                 case 's': boothowto |= RB_SINGLE; break;
   89                                 case 'v': boothowto |= RB_VERBOSE; break;
   90                                 }
   91                         }
   92                 } else {
   93                         n = strsep(&v, "=");
   94                         if (v == NULL)
   95                                 setenv(n, "1");
   96                         else
   97                                 setenv(n, v);
   98                 }
   99         }
  100 }
  101 
  102 void
  103 platform_cpu_init()
  104 {
  105         /* Nothing special */
  106 }
  107 
  108 void
  109 platform_reset(void)
  110 {
  111         ar71xx_device_stop(RST_RESET_FULL_CHIP);
  112         /* Wait for reset */
  113         while(1)
  114                 ;
  115 }
  116 
  117 /*
  118  * Obtain the MAC address via the Redboot environment.
  119  */
  120 static void
  121 ar71xx_redboot_get_macaddr(void)
  122 {
  123         char *var;
  124         int count = 0;
  125 
  126         /*
  127          * "ethaddr" is passed via envp on RedBoot platforms
  128          * "kmac" is passed via argv on RouterBOOT platforms
  129          */
  130         if ((var = getenv("ethaddr")) != NULL ||
  131             (var = getenv("kmac")) != NULL) {
  132                 count = sscanf(var, "%x%*c%x%*c%x%*c%x%*c%x%*c%x",
  133                     &ar711_base_mac[0], &ar711_base_mac[1],
  134                     &ar711_base_mac[2], &ar711_base_mac[3],
  135                     &ar711_base_mac[4], &ar711_base_mac[5]);
  136                 if (count < 6)
  137                         memset(ar711_base_mac, 0,
  138                             sizeof(ar711_base_mac));
  139                 freeenv(var);
  140         }
  141 }
  142 
  143 void
  144 platform_start(__register_t a0 __unused, __register_t a1 __unused, 
  145     __register_t a2 __unused, __register_t a3 __unused)
  146 {
  147         uint64_t platform_counter_freq;
  148         int argc = 0, i;
  149         char **argv = NULL, **envp = NULL;
  150         vm_offset_t kernend;
  151 
  152         /* 
  153          * clear the BSS and SBSS segments, this should be first call in
  154          * the function
  155          */
  156         kernend = (vm_offset_t)&end;
  157         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  158 
  159         mips_postboot_fixup();
  160 
  161         /* Initialize pcpu stuff */
  162         mips_pcpu0_init();
  163 
  164         /*
  165          * Until some more sensible abstractions for uboot/redboot
  166          * environment handling, we have to make this a compile-time
  167          * hack.  The existing code handles the uboot environment
  168          * very incorrectly so we should just ignore initialising
  169          * the relevant pointers.
  170          */
  171 #ifndef AR71XX_ENV_UBOOT
  172         argc = a0;
  173         argv = (char**)a1;
  174         envp = (char**)a2;
  175 #endif
  176         /* 
  177          * Protect ourselves from garbage in registers 
  178          */
  179         if (MIPS_IS_VALID_PTR(envp)) {
  180                 for (i = 0; envp[i]; i += 2) {
  181                         if (strcmp(envp[i], "memsize") == 0)
  182                                 realmem = btoc(strtoul(envp[i+1], NULL, 16));
  183                 }
  184         }
  185 
  186         /*
  187          * Just wild guess. RedBoot let us down and didn't reported 
  188          * memory size
  189          */
  190         if (realmem == 0)
  191                 realmem = btoc(32*1024*1024);
  192 
  193         /*
  194          * Allow build-time override in case Redboot lies
  195          * or in other situations (eg where there's u-boot)
  196          * where there isn't (yet) a convienent method of
  197          * being told how much RAM is available.
  198          *
  199          * This happens on at least the Ubiquiti LS-SR71A
  200          * board, where redboot says there's 16mb of RAM
  201          * but in fact there's 32mb.
  202          */
  203 #if     defined(AR71XX_REALMEM)
  204                 realmem = btoc(AR71XX_REALMEM);
  205 #endif
  206 
  207         /* phys_avail regions are in bytes */
  208         phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
  209         phys_avail[1] = ctob(realmem);
  210 
  211         dump_avail[0] = phys_avail[0];
  212         dump_avail[1] = phys_avail[1] - phys_avail[0];
  213 
  214         physmem = realmem;
  215 
  216         /*
  217          * ns8250 uart code uses DELAY so ticker should be inititalized 
  218          * before cninit. And tick_init_params refers to hz, so * init_param1 
  219          * should be called first.
  220          */
  221         init_param1();
  222 
  223         /* Detect the system type - this is needed for subsequent chipset-specific calls */
  224         ar71xx_detect_sys_type();
  225         ar71xx_detect_sys_frequency();
  226 
  227         platform_counter_freq = ar71xx_cpu_freq();
  228         mips_timer_init_params(platform_counter_freq, 1);
  229         cninit();
  230         init_static_kenv(boot1_env, sizeof(boot1_env));
  231 
  232         printf("CPU platform: %s\n", ar71xx_get_system_type());
  233         printf("CPU Frequency=%d MHz\n", u_ar71xx_cpu_freq / 1000000);
  234         printf("CPU DDR Frequency=%d MHz\n", u_ar71xx_ddr_freq / 1000000);
  235         printf("CPU AHB Frequency=%d MHz\n", u_ar71xx_ahb_freq / 1000000);
  236         printf("platform frequency: %lld\n", platform_counter_freq);
  237         printf("CPU reference clock: %d MHz\n", u_ar71xx_refclk / 1000000);
  238         printf("arguments: \n");
  239         printf("  a0 = %08x\n", a0);
  240         printf("  a1 = %08x\n", a1);
  241         printf("  a2 = %08x\n", a2);
  242         printf("  a3 = %08x\n", a3);
  243 
  244         /*
  245          * XXX this code is very redboot specific.
  246          */
  247         printf("Cmd line:");
  248         if (MIPS_IS_VALID_PTR(argv)) {
  249                 for (i = 0; i < argc; i++) {
  250                         printf(" %s", argv[i]);
  251                         parse_argv(argv[i]);
  252                 }
  253         }
  254         else
  255                 printf ("argv is invalid");
  256         printf("\n");
  257 
  258         printf("Environment:\n");
  259         if (MIPS_IS_VALID_PTR(envp)) {
  260                 for (i = 0; envp[i]; i+=2) {
  261                         printf("  %s = %s\n", envp[i], envp[i+1]);
  262                         setenv(envp[i], envp[i+1]);
  263                 }
  264         }
  265         else 
  266                 printf ("envp is invalid\n");
  267 
  268         /* Redboot if_arge MAC address is in the environment */
  269         ar71xx_redboot_get_macaddr();
  270 
  271         init_param2(physmem);
  272         mips_cpu_init();
  273         pmap_bootstrap();
  274         mips_proc0_init();
  275         mutex_init();
  276 
  277         /*
  278          * Reset USB devices 
  279          */
  280         ar71xx_init_usb_peripheral();
  281 
  282         kdb_init();
  283 #ifdef KDB
  284         if (boothowto & RB_KDB)
  285                 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  286 #endif
  287 }

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