malta_machdep.c

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    1 /*-
    2  * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
    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  * $FreeBSD$
   27  */
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include "opt_ddb.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/imgact.h>
   38 #include <sys/bio.h>
   39 #include <sys/buf.h>
   40 #include <sys/bus.h>
   41 #include <sys/cpu.h>
   42 #include <sys/cons.h>
   43 #include <sys/exec.h>
   44 #include <sys/ucontext.h>
   45 #include <sys/proc.h>
   46 #include <sys/kdb.h>
   47 #include <sys/ptrace.h>
   48 #include <sys/reboot.h>
   49 #include <sys/signalvar.h>
   50 #include <sys/sysent.h>
   51 #include <sys/sysproto.h>
   52 #include <sys/user.h>
   53 
   54 #include <vm/vm.h>
   55 #include <vm/vm_object.h>
   56 #include <vm/vm_page.h>
   57 
   58 #include <machine/clock.h>
   59 #include <machine/cpu.h>
   60 #include <machine/cpuregs.h>
   61 #include <machine/hwfunc.h>
   62 #include <machine/md_var.h>
   63 #include <machine/pmap.h>
   64 #include <machine/trap.h>
   65 
   66 #ifdef TICK_USE_YAMON_FREQ
   67 #include <mips/malta/yamon.h>
   68 #endif
   69 
   70 #ifdef TICK_USE_MALTA_RTC
   71 #include <mips/mips4k/malta/maltareg.h>
   72 #include <dev/mc146818/mc146818reg.h>
   73 #include <isa/rtc.h>
   74 #endif
   75 
   76 #include <mips/malta/maltareg.h>
   77 
   78 extern int      *edata;
   79 extern int      *end;
   80 
   81 void    lcd_init(void);
   82 void    lcd_puts(char *);
   83 void    malta_reset(void);
   84 
   85 /*
   86  * Temporary boot environment used at startup.
   87  */
   88 static char boot1_env[4096];
   89 
   90 /*
   91  * Offsets to MALTA LCD characters.
   92  */
   93 static int malta_lcd_offs[] = {
   94         MALTA_ASCIIPOS0,
   95         MALTA_ASCIIPOS1,
   96         MALTA_ASCIIPOS2,
   97         MALTA_ASCIIPOS3,
   98         MALTA_ASCIIPOS4,
   99         MALTA_ASCIIPOS5,
  100         MALTA_ASCIIPOS6,
  101         MALTA_ASCIIPOS7
  102 };
  103 
  104 void
  105 platform_cpu_init()
  106 {
  107         /* Nothing special */
  108 }
  109 
  110 /*
  111  * Put character to Malta LCD at given position.
  112  */
  113 static void
  114 malta_lcd_putc(int pos, char c)
  115 {
  116         void *addr;
  117         char *ch;
  118 
  119         if (pos < 0 || pos > 7)
  120                 return;
  121         addr = (void *)(MALTA_ASCII_BASE + malta_lcd_offs[pos]);
  122         ch = (char *)MIPS_PHYS_TO_KSEG0(addr);
  123         *ch = c;
  124 }
  125 
  126 /*
  127  * Print given string on LCD.
  128  */
  129 static void
  130 malta_lcd_print(char *str)
  131 {
  132         int i;
  133         
  134         if (str == NULL)
  135                 return;
  136 
  137         for (i = 0; *str != '\0'; i++, str++)
  138                 malta_lcd_putc(i, *str);
  139 }
  140 
  141 void
  142 lcd_init(void)
  143 {
  144         malta_lcd_print("FreeBSD_");
  145 }
  146 
  147 void
  148 lcd_puts(char *s)
  149 {
  150         malta_lcd_print(s);
  151 }
  152 
  153 #ifdef TICK_USE_MALTA_RTC
  154 static __inline uint8_t
  155 rtcin(uint8_t addr)
  156 {
  157 
  158         *((volatile uint8_t *)
  159             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
  160         return (*((volatile uint8_t *)
  161             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))));
  162 }
  163 
  164 static __inline void
  165 writertc(uint8_t addr, uint8_t val)
  166 {
  167 
  168         *((volatile uint8_t *)
  169             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
  170         *((volatile uint8_t *)
  171             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))) = val;
  172 }
  173 #endif
  174 
  175 static void
  176 mips_init(unsigned long memsize, uint64_t ememsize)
  177 {
  178         int i;
  179 
  180         for (i = 0; i < PHYS_AVAIL_ENTRIES; i++) {
  181                 phys_avail[i] = 0;
  182         }
  183 
  184         /*
  185          * memsize is the amount of RAM available below 256MB.
  186          * ememsize is the total amount of RAM available.
  187          *
  188          * The second bank starts at 0x90000000.
  189          */
  190 
  191         /* phys_avail regions are in bytes */
  192         phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
  193         phys_avail[1] = memsize;
  194         dump_avail[0] = phys_avail[0];
  195         dump_avail[1] = phys_avail[1];
  196 
  197         /* Only specify the extended region if it's set */
  198         if (ememsize > memsize) {
  199                 phys_avail[2] = 0x90000000;
  200                 phys_avail[3] = 0x90000000 + (ememsize - memsize);
  201                 dump_avail[2] = phys_avail[2];
  202                 dump_avail[3] = phys_avail[3];
  203         }
  204 
  205         /* XXX realmem assigned in the caller of mips_init() */
  206         physmem = realmem;
  207 
  208         init_param1();
  209         init_param2(physmem);
  210         mips_cpu_init();
  211         pmap_bootstrap();
  212         mips_proc0_init();
  213         mutex_init();
  214         kdb_init();
  215 #ifdef KDB
  216         if (boothowto & RB_KDB)
  217                 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  218 #endif
  219 }
  220 
  221 /*
  222  * Perform a board-level soft-reset.
  223  * Note that this is not emulated by gxemul.
  224  */
  225 void
  226 platform_reset(void)
  227 {
  228         char *c;
  229 
  230         c = (char *)MIPS_PHYS_TO_KSEG0(MALTA_SOFTRES);
  231         *c = MALTA_GORESET;
  232 }
  233 
  234 static uint64_t
  235 malta_cpu_freq(void)
  236 {
  237         uint64_t platform_counter_freq = 0;
  238 
  239 #if defined(TICK_USE_YAMON_FREQ)
  240         /*
  241          * If we are running on a board which uses YAMON firmware,
  242          * then query CPU pipeline clock from the syscon object.
  243          * If unsuccessful, use hard-coded default.
  244          */
  245         platform_counter_freq = yamon_getcpufreq();
  246 
  247 #elif defined(TICK_USE_MALTA_RTC)
  248         /*
  249          * If we are running on a board with the MC146818 RTC,
  250          * use it to determine CPU pipeline clock frequency.
  251          */
  252         u_int64_t counterval[2];
  253 
  254         /* Set RTC to binary mode. */
  255         writertc(RTC_STATUSB, (rtcin(RTC_STATUSB) | RTCSB_BCD));
  256 
  257         /* Busy-wait for falling edge of RTC update. */
  258         while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
  259                 ;
  260         while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
  261                 ;
  262         counterval[0] = mips_rd_count();
  263 
  264         /* Busy-wait for falling edge of RTC update. */
  265         while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
  266                 ;
  267         while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
  268                 ;
  269         counterval[1] = mips_rd_count();
  270 
  271         platform_counter_freq = counterval[1] - counterval[0];
  272 #endif
  273 
  274         if (platform_counter_freq == 0)
  275                 platform_counter_freq = MIPS_DEFAULT_HZ;
  276 
  277         return (platform_counter_freq);
  278 }
  279 
  280 void
  281 platform_start(__register_t a0, __register_t a1,  __register_t a2, 
  282     __register_t a3)
  283 {
  284         vm_offset_t kernend;
  285         uint64_t platform_counter_freq;
  286         int argc = a0;
  287         int32_t *argv = (int32_t*)a1;
  288         int32_t *envp = (int32_t*)a2;
  289         unsigned int memsize = a3;
  290         uint64_t ememsize = 0;
  291         int i;
  292 
  293         /* clear the BSS and SBSS segments */
  294         kernend = (vm_offset_t)&end;
  295         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  296 
  297         mips_postboot_fixup();
  298 
  299         mips_pcpu0_init();
  300         platform_counter_freq = malta_cpu_freq();
  301         mips_timer_early_init(platform_counter_freq);
  302         init_static_kenv(boot1_env, sizeof(boot1_env));
  303 
  304         cninit();
  305         printf("entry: platform_start()\n");
  306 
  307         bootverbose = 1;
  308 
  309         /* 
  310          * YAMON uses 32bit pointers to strings so
  311          * convert them to proper type manually
  312          */
  313 
  314         if (bootverbose) {
  315                 printf("cmd line: ");
  316                 for (i = 0; i < argc; i++)
  317                         printf("%s ", (char*)(intptr_t)argv[i]);
  318                 printf("\n");
  319         }
  320 
  321         if (bootverbose)
  322                 printf("envp:\n");
  323 
  324         /*
  325          * Parse the environment for things like ememsize.
  326          */
  327         for (i = 0; envp[i]; i += 2) {
  328                 const char *a, *v;
  329 
  330                 a = (char *)(intptr_t)envp[i];
  331                 v = (char *)(intptr_t)envp[i+1];
  332 
  333                 if (bootverbose)
  334                         printf("\t%s = %s\n", a, v);
  335 
  336                 if (strcmp(a, "ememsize") == 0) {
  337                         ememsize = strtoul(v, NULL, 0);
  338                 }
  339         }
  340 
  341         if (bootverbose) {
  342                 printf("memsize = %llu (0x%08x)\n",
  343                     (unsigned long long) memsize, memsize);
  344                 printf("ememsize = %llu\n", (unsigned long long) ememsize);
  345         }
  346 
  347         /*
  348          * For <= 256MB RAM amounts, ememsize should equal memsize.
  349          * For > 256MB RAM amounts it's the total RAM available;
  350          * split between two banks.
  351          *
  352          * XXX TODO: just push realmem assignment into mips_init() ?
  353          */
  354         realmem = btoc(ememsize);
  355         mips_init(memsize, ememsize);
  356 
  357         mips_timer_init_params(platform_counter_freq, 0);
  358 }
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FreeBSD/Linux Kernel Cross Reference sys/mips/malta/malta_machdep.c

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sys/mips/malta/malta_machdep.c
