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/ingenic/jz4780_machdep.c

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    1 /*-
    2  * Copyright (c) 2009 Oleksandr Tymoshenko
    3  * Copyright (c) 2015 Alexander Kabaev
    4  * 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 AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: stable/12/sys/mips/ingenic/jz4780_machdep.c 343708 2019-02-03 08:45:01Z gonzo $");
   30 
   31 #include "opt_ddb.h"
   32 #include "opt_platform.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/bus.h>
   39 #include <sys/boot.h>
   40 #include <sys/cons.h>
   41 #include <sys/kdb.h>
   42 #include <sys/reboot.h>
   43 
   44 #ifdef FDT
   45 #include <dev/fdt/fdt_common.h>
   46 #include <dev/ofw/openfirm.h>
   47 #endif
   48 
   49 #include <vm/vm.h>
   50 #include <vm/vm_page.h>
   51 
   52 #include <net/ethernet.h>
   53 
   54 #include <machine/clock.h>
   55 #include <machine/cpu.h>
   56 #include <machine/cpufunc.h>
   57 #include <machine/hwfunc.h>
   58 #include <machine/md_var.h>
   59 #include <machine/trap.h>
   60 #include <machine/vmparam.h>
   61 
   62 #include <mips/ingenic/jz4780_regs.h>
   63 #include <mips/ingenic/jz4780_cpuregs.h>
   64 
   65 uint32_t * const led = (uint32_t *)0xb0010548;
   66 
   67 extern char edata[], end[];
   68 static char boot1_env[4096];
   69 
   70 void
   71 platform_cpu_init(void)
   72 {
   73         uint32_t reg;
   74 
   75         /*
   76          * Do not expect mbox interrups while writing
   77          * mbox
   78          */
   79         reg = mips_rd_xburst_reim();
   80         reg &= ~JZ_REIM_MIRQ0M;
   81         mips_wr_xburst_reim(reg);
   82 
   83         /* Clean mailboxes */
   84         mips_wr_xburst_mbox0(0);
   85         mips_wr_xburst_mbox1(0);
   86         mips_wr_xburst_core_sts(~JZ_CORESTS_MIRQ0P);
   87 
   88         /* Unmask mbox interrupts */
   89         reg |= JZ_REIM_MIRQ0M;
   90         mips_wr_xburst_reim(reg);
   91 }
   92 
   93 void
   94 platform_reset(void)
   95 {
   96         /*
   97          * For now, provoke a watchdog reset in about a second, so UART buffers
   98          * have a fighting chance to flush before we pull the plug
   99          */
  100         writereg(JZ_TCU_BASE + JZ_WDOG_TCER, 0);        /* disable watchdog */
  101         writereg(JZ_TCU_BASE + JZ_WDOG_TCNT, 0);        /* reset counter */
  102         writereg(JZ_TCU_BASE + JZ_WDOG_TDR, 128);       /* wait for ~1s */
  103         writereg(JZ_TCU_BASE + JZ_WDOG_TCSR, TCSR_RTC_EN | TCSR_DIV_256);
  104         writereg(JZ_TCU_BASE + JZ_WDOG_TCER, TCER_ENABLE);      /* fire! */
  105 
  106         /* Wait for reset */
  107         while (1)
  108                 ;
  109 }
  110 
  111 static void
  112 mips_init(void)
  113 {
  114         int i;
  115 #ifdef FDT
  116         struct mem_region mr[FDT_MEM_REGIONS];
  117         uint64_t val;
  118         int mr_cnt;
  119         int j;
  120 #endif
  121 
  122         for (i = 0; i < 10; i++) {
  123                 phys_avail[i] = 0;
  124         }
  125 
  126         /* The minimal amount of memory Ingenic SoC can have. */
  127         dump_avail[0] = phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
  128         physmem = realmem = btoc(32 * 1024 * 1024);
  129 
  130         /*
  131          * X1000 mips cpu special.
  132          * TODO: do anyone know what is this ?
  133          */
  134         __asm(
  135                 "li     $2, 0xa9000000  \n\t"
  136                 "mtc0   $2, $5, 4       \n\t"
  137                 "nop                    \n\t"
  138                 ::"r"(2));
  139 
  140 #ifdef FDT
  141         if (fdt_get_mem_regions(mr, &mr_cnt, &val) == 0) {
  142 
  143                 physmem = realmem = btoc(val);
  144 
  145                 KASSERT((phys_avail[0] >= mr[0].mr_start) && \
  146                         (phys_avail[0] < (mr[0].mr_start + mr[0].mr_size)),
  147                         ("First region is not within FDT memory range"));
  148 
  149                 /* Limit size of the first region */
  150                 phys_avail[1] = (mr[0].mr_start + MIN(mr[0].mr_size, ctob(realmem)));
  151                 dump_avail[1] = phys_avail[1];
  152 
  153                 /* Add the rest of regions */
  154                 for (i = 1, j = 2; i < mr_cnt; i++, j+=2) {
  155                         phys_avail[j] = mr[i].mr_start;
  156                         phys_avail[j+1] = (mr[i].mr_start + mr[i].mr_size);
  157                         dump_avail[j] = phys_avail[j];
  158                         dump_avail[j+1] = phys_avail[j+1];
  159                 }
  160         }
  161 #endif
  162 
  163         init_param1();
  164         init_param2(physmem);
  165         mips_cpu_init();
  166         pmap_bootstrap();
  167         mips_proc0_init();
  168         mutex_init();
  169         kdb_init();
  170         led[0] = 0x8000;
  171 #ifdef KDB
  172         if (boothowto & RB_KDB)
  173                 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  174 #endif
  175 }
  176 
  177 void
  178 platform_start(__register_t a0,  __register_t a1,
  179     __register_t a2 __unused, __register_t a3 __unused)
  180 {
  181         char **argv;
  182         int  argc;
  183         vm_offset_t kernend;
  184 #ifdef FDT
  185         vm_offset_t dtbp;
  186         phandle_t chosen;
  187         char buf[2048];         /* early stack supposedly big enough */
  188 #endif
  189         /*
  190          * clear the BSS and SBSS segments, this should be first call in
  191          * the function
  192          */
  193         kernend = (vm_offset_t)&end;
  194         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  195 
  196         mips_postboot_fixup();
  197 
  198         /* Initialize pcpu stuff */
  199         mips_pcpu0_init();
  200 
  201         /* Something to hold kernel env until kmem is available */
  202         init_static_kenv(boot1_env, sizeof(boot1_env));
  203 #ifdef FDT
  204         /*
  205          * Find the dtb passed in by the boot loader (currently fictional).
  206          */
  207         dtbp = (vm_offset_t)NULL;
  208 
  209 #if defined(FDT_DTB_STATIC)
  210         /*
  211          * In case the device tree blob was not retrieved (from metadata) try
  212          * to use the statically embedded one.
  213          */
  214         if (dtbp == (vm_offset_t)NULL)
  215                 dtbp = (vm_offset_t)&fdt_static_dtb;
  216 #else
  217 #error  "Non-static FDT not supported on JZ4780"
  218 #endif
  219         if (OF_install(OFW_FDT, 0) == FALSE)
  220                 while (1);
  221         if (OF_init((void *)dtbp) != 0)
  222                 while (1);
  223 #endif
  224 
  225         cninit();
  226 #ifdef FDT
  227         /*
  228          * Get bootargs from FDT if specified.
  229          */
  230         chosen = OF_finddevice("/chosen");
  231         if (OF_getprop(chosen, "bootargs", buf, sizeof(buf)) != -1)
  232                 boothowto |= boot_parse_cmdline(buf);
  233 #endif
  234         /* Parse cmdline from U-Boot */
  235         argc = a0;
  236         argv = (char **)a1;
  237         boothowto |= boot_parse_args(argc, argv);
  238 
  239         mips_init();
  240 }

Cache object: 007326648792a6c8086724ab3b0377f9


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