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: releng/8.1/sys/mips/malta/malta_machdep.c 182901 2008-09-10 03:49:08Z gonzo $
   27  */
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/8.1/sys/mips/malta/malta_machdep.c 182901 2008-09-10 03:49:08Z gonzo $");
   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 #include <vm/vm_pager.h>
   58 
   59 #include <machine/clock.h>
   60 #include <machine/cpu.h>
   61 #include <machine/cpuregs.h>
   62 #include <machine/hwfunc.h>
   63 #include <machine/md_var.h>
   64 #include <machine/pmap.h>
   65 #include <machine/trap.h>
   66 
   67 #ifdef TICK_USE_YAMON_FREQ
   68 #include <mips/malta/yamon.h>
   69 #endif
   70 
   71 #ifdef TICK_USE_MALTA_RTC
   72 #include <mips/mips4k/malta/maltareg.h>
   73 #include <dev/mc146818/mc146818reg.h>
   74 #include <isa/rtc.h>
   75 #endif
   76 
   77 #include <mips/malta/maltareg.h>
   78 
   79 extern int      *edata;
   80 extern int      *end;
   81 
   82 void    lcd_init(void);
   83 void    lcd_puts(char *);
   84 void    malta_reset(void);
   85 
   86 /*
   87  * Offsets to MALTA LCD characters.
   88  */
   89 static int malta_lcd_offs[] = {
   90         MALTA_ASCIIPOS0,
   91         MALTA_ASCIIPOS1,
   92         MALTA_ASCIIPOS2,
   93         MALTA_ASCIIPOS3,
   94         MALTA_ASCIIPOS4,
   95         MALTA_ASCIIPOS5,
   96         MALTA_ASCIIPOS6,
   97         MALTA_ASCIIPOS7
   98 };
   99 
  100 /*
  101  * Put character to Malta LCD at given position.
  102  */
  103 static void
  104 malta_lcd_putc(int pos, char c)
  105 {
  106         void *addr;
  107         char *ch;
  108 
  109         if (pos < 0 || pos > 7)
  110                 return;
  111         addr = (void *)(MALTA_ASCII_BASE + malta_lcd_offs[pos]);
  112         ch = (char *)MIPS_PHYS_TO_KSEG0(addr);
  113         *ch = c;
  114 }
  115 
  116 /*
  117  * Print given string on LCD.
  118  */
  119 static void
  120 malta_lcd_print(char *str)
  121 {
  122         int i;
  123         
  124         if (str == NULL)
  125                 return;
  126 
  127         for (i = 0; *str != '\0'; i++, str++)
  128                 malta_lcd_putc(i, *str);
  129 }
  130 
  131 void
  132 lcd_init(void)
  133 {
  134         malta_lcd_print("FreeBSD_");
  135 }
  136 
  137 void
  138 lcd_puts(char *s)
  139 {
  140         malta_lcd_print(s);
  141 }
  142 
  143 #ifdef TICK_USE_MALTA_RTC
  144 static __inline uint8_t
  145 rtcin(uint8_t addr)
  146 {
  147 
  148         *((volatile uint8_t *)
  149             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
  150         return (*((volatile uint8_t *)
  151             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))));
  152 }
  153 
  154 static __inline void
  155 writertc(uint8_t addr, uint8_t val)
  156 {
  157 
  158         *((volatile uint8_t *)
  159             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
  160         *((volatile uint8_t *)
  161             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))) = val;
  162 }
  163 #endif
  164 
  165 static void
  166 mips_init(void)
  167 {
  168         int i;
  169 
  170         for (i = 0; i < 10; i++) {
  171                 phys_avail[i] = 0;
  172         }
  173 
  174         /* phys_avail regions are in bytes */
  175         phys_avail[0] = MIPS_KSEG0_TO_PHYS((vm_offset_t)&end);
  176         phys_avail[1] = ctob(realmem);
  177 
  178         physmem = realmem;
  179 
  180         init_param1();
  181         init_param2(physmem);
  182         mips_cpu_init();
  183         pmap_bootstrap();
  184         mips_proc0_init();
  185         mutex_init();
  186 #ifdef DDB
  187         kdb_init();
  188 #endif
  189 }
  190 
  191 void
  192 platform_halt(void)
  193 {
  194 
  195 }
  196 
  197 
  198 void
  199 platform_identify(void)
  200 {
  201 
  202 }
  203 
  204 /*
  205  * Perform a board-level soft-reset.
  206  * Note that this is not emulated by gxemul.
  207  */
  208 void
  209 platform_reset(void)
  210 {
  211         char *c;
  212 
  213         c = (char *)MIPS_PHYS_TO_KSEG0(MALTA_SOFTRES);
  214         *c = MALTA_GORESET;
  215 }
  216 
  217 void
  218 platform_trap_enter(void)
  219 {
  220 
  221 }
  222 
  223 void
  224 platform_trap_exit(void)
  225 {
  226 
  227 }
  228 
  229 void
  230 platform_start(__register_t a0, __register_t a1,  __register_t a2, 
  231     __register_t a3)
  232 {
  233         vm_offset_t kernend;
  234         uint64_t platform_counter_freq;
  235         int argc = a0;
  236         char **argv = (char **)a1;
  237         char **envp = (char **)a2;
  238         unsigned int memsize = a3;
  239         int i;
  240 
  241         /* clear the BSS and SBSS segments */
  242         kernend = round_page((vm_offset_t)&end);
  243         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  244 
  245         cninit();
  246         printf("entry: platform_start()\n");
  247 
  248         bootverbose = 1;
  249         if (bootverbose) {
  250                 printf("cmd line: ");
  251                 for (i = 0; i < argc; i++)
  252                         printf("%s ", argv[i]);
  253                 printf("\n");
  254 
  255                 printf("envp:\n");
  256                 for (i = 0; envp[i]; i += 2)
  257                         printf("\t%s = %s\n", envp[i], envp[i+1]);
  258 
  259                 printf("memsize = %08x\n", memsize);
  260         }
  261 
  262         realmem = btoc(memsize);
  263         mips_init();
  264 
  265         do {
  266 #if defined(TICK_USE_YAMON_FREQ)
  267                 /*
  268                  * If we are running on a board which uses YAMON firmware,
  269                  * then query CPU pipeline clock from the syscon object.
  270                  * If unsuccessful, use hard-coded default.
  271                  */
  272                 platform_counter_freq = yamon_getcpufreq();
  273                 if (platform_counter_freq == 0)
  274                         platform_counter_freq = MIPS_DEFAULT_HZ;
  275 
  276 #elif defined(TICK_USE_MALTA_RTC)
  277                 /*
  278                  * If we are running on a board with the MC146818 RTC,
  279                  * use it to determine CPU pipeline clock frequency.
  280                  */
  281                 u_int64_t counterval[2];
  282 
  283                 /* Set RTC to binary mode. */
  284                 writertc(RTC_STATUSB, (rtcin(RTC_STATUSB) | RTCSB_BCD));
  285 
  286                 /* Busy-wait for falling edge of RTC update. */
  287                 while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
  288                         ;
  289                 while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
  290                         ;
  291                 counterval[0] = mips_rd_count();
  292 
  293                 /* Busy-wait for falling edge of RTC update. */
  294                 while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
  295                         ;
  296                 while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
  297                         ;
  298                 counterval[1] = mips_rd_count();
  299 
  300                 platform_counter_freq = counterval[1] - counterval[0];
  301 #endif
  302         } while(0);
  303 
  304         mips_timer_init_params(platform_counter_freq, 0);
  305 }

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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