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/mediatek/mtk_machdep.c

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    1 /*-
    2  * Copyright (C) 2015-2016 by Stanislav Galabov. All rights reserved.
    3  * Copyright (C) 2010-2011 by Aleksandr Rybalko. All rights reserved.
    4  * Copyright (C) 2007 by Oleksandr Tymoshenko. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
   19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   21  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
   24  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   25  * THE POSSIBILITY OF SUCH DAMAGE.
   26  *
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/12/sys/mips/mediatek/mtk_machdep.c 336245 2018-07-13 16:43:17Z imp $");
   31 
   32 #include "opt_ddb.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/conf.h>
   36 #include <sys/kernel.h>
   37 #include <sys/systm.h>
   38 #include <sys/imgact.h>
   39 #include <sys/bio.h>
   40 #include <sys/buf.h>
   41 #include <sys/bus.h>
   42 #include <sys/cpu.h>
   43 #include <sys/cons.h>
   44 #include <sys/exec.h>
   45 #include <sys/ucontext.h>
   46 #include <sys/proc.h>
   47 #include <sys/kdb.h>
   48 #include <sys/ptrace.h>
   49 #include <sys/boot.h>
   50 #include <sys/reboot.h>
   51 #include <sys/signalvar.h>
   52 #include <sys/sysent.h>
   53 #include <sys/sysproto.h>
   54 #include <sys/user.h>
   55 
   56 #include <vm/vm.h>
   57 #include <vm/vm_object.h>
   58 #include <vm/vm_page.h>
   59 
   60 #include <machine/cache.h>
   61 #include <machine/clock.h>
   62 #include <machine/cpu.h>
   63 #include <machine/cpuinfo.h>
   64 #include <machine/cpufunc.h>
   65 #include <machine/cpuregs.h>
   66 #include <machine/hwfunc.h>
   67 #include <machine/intr_machdep.h>
   68 #include <machine/locore.h>
   69 #include <machine/md_var.h>
   70 #include <machine/pte.h>
   71 #include <machine/sigframe.h>
   72 #include <machine/trap.h>
   73 #include <machine/vmparam.h>
   74 
   75 #include <mips/mediatek/mtk_sysctl.h>
   76 #include <mips/mediatek/mtk_soc.h>
   77 
   78 #include "opt_platform.h"
   79 #include "opt_rt305x.h"
   80 
   81 #include <dev/fdt/fdt_common.h>
   82 #include <dev/ofw/openfirm.h>
   83 
   84 extern int      *edata;
   85 extern int      *end;
   86 static char     boot1_env[0x1000];
   87 
   88 void
   89 platform_cpu_init()
   90 {
   91         /* Nothing special */
   92 }
   93 
   94 static void
   95 mips_init(void)
   96 {
   97         struct mem_region mr[FDT_MEM_REGIONS];
   98         uint64_t val;
   99         int i, j, mr_cnt;
  100         char *memsize;
  101 
  102         printf("entry: mips_init()\n");
  103 
  104         bootverbose = 1;
  105 
  106         for (i = 0; i < 10; i++)
  107                 phys_avail[i] = 0;
  108 
  109         dump_avail[0] = phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
  110 
  111         /*
  112          * The most low memory MT7621 can have. Currently MT7621 is the chip
  113          * that supports the most memory, so that seems reasonable.
  114          */
  115         realmem = btoc(448 * 1024 * 1024);
  116 
  117         if (fdt_get_mem_regions(mr, &mr_cnt, &val) == 0) {
  118                 physmem = btoc(val);
  119 
  120                 printf("RAM size: %ldMB (from FDT)\n",
  121                     ctob(physmem) / (1024 * 1024));
  122 
  123                 KASSERT((phys_avail[0] >= mr[0].mr_start) && \
  124                         (phys_avail[0] < (mr[0].mr_start + mr[0].mr_size)),
  125                         ("First region is not within FDT memory range"));
  126 
  127                 /* Limit size of the first region */
  128                 phys_avail[1] = (mr[0].mr_start +
  129                     MIN(mr[0].mr_size, ctob(realmem)));
  130                 dump_avail[1] = phys_avail[1];
  131 
  132                 /* Add the rest of the regions */
  133                 for (i = 1, j = 2; i < mr_cnt; i++, j+=2) {
  134                         phys_avail[j] = mr[i].mr_start;
  135                         phys_avail[j+1] = (mr[i].mr_start + mr[i].mr_size);
  136                         dump_avail[j] = phys_avail[j];
  137                         dump_avail[j+1] = phys_avail[j+1];
  138                 }
  139         } else {
  140                 if ((memsize = kern_getenv("memsize")) != NULL) {
  141                         physmem = btoc(strtol(memsize, NULL, 0) << 20);
  142                         printf("RAM size: %ldMB (from memsize)\n",
  143                             ctob(physmem) / (1024 * 1024));
  144                 } else { /* All else failed, assume 32MB */
  145                         physmem = btoc(32 * 1024 * 1024);
  146                         printf("RAM size: %ldMB (assumed)\n",
  147                             ctob(physmem) / (1024 * 1024));
  148                 }
  149 
  150                 if (mtk_soc_get_socid() == MTK_SOC_RT2880) {
  151                         /* RT2880 memory start is 88000000 */
  152                         dump_avail[1] = phys_avail[1] = ctob(physmem)
  153                             + 0x08000000;
  154                 } else if (ctob(physmem) < (448 * 1024 * 1024)) {
  155                         /*
  156                          * Anything up to 448MB is assumed to be directly
  157                          * mappable as low memory...
  158                          */
  159                         dump_avail[1] = phys_avail[1] = ctob(physmem);
  160                 } else if (mtk_soc_get_socid() == MTK_SOC_MT7621) {
  161                         /*
  162                          * On MT7621 the low memory is limited to 448MB, the
  163                          * rest is high memory, mapped at 0x20000000
  164                          */
  165                         phys_avail[1] = 448 * 1024 * 1024;
  166                         phys_avail[2] = 0x20000000;
  167                         phys_avail[3] = phys_avail[2] + ctob(physmem) -
  168                             phys_avail[1];
  169                         dump_avail[1] = phys_avail[1] - phys_avail[0];
  170                         dump_avail[2] = phys_avail[2];
  171                         dump_avail[3] = phys_avail[3] - phys_avail[2];
  172                 } else {
  173                         /*
  174                          * We have > 448MB RAM and we're not MT7621? Currently
  175                          * there is no such chip, so we'll just limit the RAM to
  176                          * 32MB and let the user know...
  177                          */
  178                         printf("Unknown chip, assuming 32MB RAM\n");
  179                         physmem = btoc(32 * 1024 * 1024);
  180                         dump_avail[1] = phys_avail[1] = ctob(physmem);
  181                 }
  182         }
  183 
  184         if (physmem < realmem)
  185                 realmem = physmem;
  186 
  187         init_param1();
  188         init_param2(physmem);
  189         mips_cpu_init();
  190         pmap_bootstrap();
  191         mips_proc0_init();
  192         mutex_init();
  193         kdb_init();
  194 #ifdef KDB
  195         if (boothowto & RB_KDB)
  196                 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  197 #endif
  198 }
  199 
  200 void
  201 platform_reset(void)
  202 {
  203 
  204         mtk_soc_reset();
  205 }
  206 
  207 void
  208 platform_start(__register_t a0 __unused, __register_t a1 __unused, 
  209     __register_t a2 __unused, __register_t a3 __unused)
  210 {
  211         vm_offset_t kernend;
  212         int argc = a0, i;//, res;
  213         uint32_t timer_clk;
  214         char **argv = (char **)MIPS_PHYS_TO_KSEG0(a1);
  215         char **envp = (char **)MIPS_PHYS_TO_KSEG0(a2);
  216         void *dtbp;
  217         phandle_t chosen;
  218         char buf[2048];
  219 
  220         /* clear the BSS and SBSS segments */
  221         kernend = (vm_offset_t)&end;
  222         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  223 
  224         mips_postboot_fixup();
  225 
  226         /* Initialize pcpu stuff */
  227         mips_pcpu0_init();
  228 
  229         dtbp = &fdt_static_dtb;
  230         if (OF_install(OFW_FDT, 0) == FALSE)
  231                 while (1);
  232         if (OF_init((void *)dtbp) != 0)
  233                 while (1);
  234 
  235         mtk_soc_try_early_detect();
  236         if ((timer_clk = mtk_soc_get_timerclk()) == 0)
  237                 timer_clk = 1000000000; /* no such speed yet */
  238 
  239         mips_timer_early_init(timer_clk);
  240 
  241         /* initialize console so that we have printf */
  242         boothowto |= (RB_SERIAL | RB_MULTIPLE); /* Use multiple consoles */
  243         boothowto |= (RB_VERBOSE);
  244         cninit();
  245 
  246         init_static_kenv(boot1_env, sizeof(boot1_env));
  247 
  248         /*
  249          * Get bsdbootargs from FDT if specified.
  250          */
  251         chosen = OF_finddevice("/chosen");
  252         if (OF_getprop(chosen, "bsdbootargs", buf, sizeof(buf)) != -1)
  253                 boothowto |= boot_parse_cmdline(buf);
  254 
  255         printf("FDT DTB  at: 0x%08x\n", (uint32_t)dtbp);
  256 
  257         printf("CPU   clock: %4dMHz\n", mtk_soc_get_cpuclk()/(1000*1000));
  258         printf("Timer clock: %4dMHz\n", timer_clk/(1000*1000));
  259         printf("UART  clock: %4dMHz\n\n", mtk_soc_get_uartclk()/(1000*1000));
  260 
  261         printf("U-Boot args (from %d args):\n", argc - 1);
  262 
  263         if (argc == 1)
  264                 printf("\tNone\n");
  265 
  266         for (i = 1; i < argc; i++) {
  267                 char *n = "argv  ", *arg;
  268 
  269                 if (i > 99)
  270                         break;
  271 
  272                 if (argv[i])
  273                 {
  274                         arg = (char *)(intptr_t)MIPS_PHYS_TO_KSEG0(argv[i]);
  275                         printf("\targv[%d] = %s\n", i, arg);
  276                         sprintf(n, "argv%d", i);
  277                         kern_setenv(n, arg);
  278                 }
  279         }
  280 
  281         printf("Environment:\n");
  282 
  283         for (i = 0; envp[i] && MIPS_IS_VALID_PTR(envp[i]); i++) {
  284                 char *n, *arg;
  285 
  286                 arg = (char *)(intptr_t)MIPS_PHYS_TO_KSEG0(envp[i]);
  287                 if (! MIPS_IS_VALID_PTR(arg))
  288                         continue;
  289                 printf("\t%s\n", arg);
  290                 n = strsep(&arg, "=");
  291                 if (arg == NULL)
  292                         kern_setenv(n, "1");
  293                 else
  294                         kern_setenv(n, arg);
  295         }
  296 
  297 
  298         mips_init();
  299         mips_timer_init_params(timer_clk, 0);
  300 }

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