LXR linux/arch/m68k/sun3/config.c

   1/*
   2 *  linux/arch/m68k/sun3/config.c
   3 *
   4 *  Copyright (C) 1996,1997 Pekka Pietik{inen
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License.  See the file COPYING in the main directory of this archive
   8 * for more details.
   9 */
  10
  11#include <linux/types.h>
  12#include <linux/kernel.h>
  13#include <linux/mm.h>
  14#include <linux/tty.h>
  15#include <linux/console.h>
  16#include <linux/init.h>
  17#include <linux/bootmem.h>
  18
  19#include <asm/oplib.h>
  20#include <asm/setup.h>
  21#include <asm/contregs.h>
  22#include <asm/movs.h>
  23#include <asm/pgtable.h>
  24#include <asm/pgalloc.h>
  25#include <asm/sun3-head.h>
  26#include <asm/sun3mmu.h>
  27#include <asm/rtc.h>
  28#include <asm/machdep.h>
  29#include <asm/intersil.h>
  30#include <asm/irq.h>
  31#include <asm/segment.h>
  32#include <asm/sun3ints.h>
  33
  34extern char _text, _end;
  35
  36char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
  37
  38extern unsigned long sun3_gettimeoffset(void);
  39extern void sun3_sched_init(irq_handler_t handler);
  40extern void sun3_get_model (char* model);
  41extern void idprom_init (void);
  42extern int sun3_hwclk(int set, struct rtc_time *t);
  43
  44volatile char* clock_va;
  45extern volatile unsigned char* sun3_intreg;
  46extern unsigned long availmem;
  47unsigned long num_pages;
  48
  49static int sun3_get_hardware_list(char *buffer)
  50{
  51
  52        int len = 0;
  53
  54        len += sprintf(buffer + len, "PROM Revision:\t%s\n",
  55                       romvec->pv_monid);
  56
  57        return len;
  58
  59}
  60
  61void __init sun3_init(void)
  62{
  63        unsigned char enable_register;
  64        int i;
  65
  66        m68k_machtype= MACH_SUN3;
  67        m68k_cputype = CPU_68020;
  68        m68k_fputype = FPU_68881; /* mc68881 actually */
  69        m68k_mmutype = MMU_SUN3;
  70        clock_va    =          (char *) 0xfe06000;      /* dark  */
  71        sun3_intreg = (unsigned char *) 0xfe0a000;      /* magic */
  72        sun3_disable_interrupts();
  73
  74        prom_init((void *)LINUX_OPPROM_BEGVM);
  75
  76        GET_CONTROL_BYTE(AC_SENABLE,enable_register);
  77        enable_register |= 0x50; /* Enable FPU */
  78        SET_CONTROL_BYTE(AC_SENABLE,enable_register);
  79        GET_CONTROL_BYTE(AC_SENABLE,enable_register);
  80
  81        /* This code looks suspicious, because it doesn't subtract
  82           memory belonging to the kernel from the available space */
  83
  84
  85        memset(sun3_reserved_pmeg, 0, sizeof(sun3_reserved_pmeg));
  86
  87        /* Reserve important PMEGS */
  88        /* FIXME: These should be probed instead of hardcoded */
  89
  90        for (i=0; i<8; i++)             /* Kernel PMEGs */
  91                sun3_reserved_pmeg[i] = 1;
  92
  93        sun3_reserved_pmeg[247] = 1;    /* ROM mapping  */
  94        sun3_reserved_pmeg[248] = 1;    /* AMD Ethernet */
  95        sun3_reserved_pmeg[251] = 1;    /* VB area      */
  96        sun3_reserved_pmeg[254] = 1;    /* main I/O     */
  97
  98        sun3_reserved_pmeg[249] = 1;
  99        sun3_reserved_pmeg[252] = 1;
 100        sun3_reserved_pmeg[253] = 1;
 101        set_fs(KERNEL_DS);
 102}
 103
 104/* Without this, Bad Things happen when something calls arch_reset. */
 105static void sun3_reboot (void)
 106{
 107        prom_reboot ("vmlinux");
 108}
 109
 110static void sun3_halt (void)
 111{
 112        prom_halt ();
 113}
 114
 115/* sun3 bootmem allocation */
 116
 117void __init sun3_bootmem_alloc(unsigned long memory_start, unsigned long memory_end)
 118{
 119        unsigned long start_page;
 120
 121        /* align start/end to page boundaries */
 122        memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK);
 123        memory_end = memory_end & PAGE_MASK;
 124
 125        start_page = __pa(memory_start) >> PAGE_SHIFT;
 126        num_pages = __pa(memory_end) >> PAGE_SHIFT;
 127
 128        high_memory = (void *)memory_end;
 129        availmem = memory_start;
 130
 131        m68k_setup_node(0);
 132        availmem += init_bootmem_node(NODE_DATA(0), start_page, 0, num_pages);
 133        availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK;
 134
 135        free_bootmem(__pa(availmem), memory_end - (availmem));
 136}
 137
 138
 139void __init config_sun3(void)
 140{
 141        unsigned long memory_start, memory_end;
 142
 143        printk("ARCH: SUN3\n");
 144        idprom_init();
 145
 146        /* Subtract kernel memory from available memory */
 147
 148        mach_sched_init      =  sun3_sched_init;
 149        mach_init_IRQ        =  sun3_init_IRQ;
 150        mach_reset           =  sun3_reboot;
 151        mach_gettimeoffset   =  sun3_gettimeoffset;
 152        mach_get_model       =  sun3_get_model;
 153        mach_hwclk           =  sun3_hwclk;
 154        mach_halt            =  sun3_halt;
 155        mach_get_hardware_list = sun3_get_hardware_list;
 156
 157        memory_start = ((((int)&_end) + 0x2000) & ~0x1fff);
 158// PROM seems to want the last couple of physical pages. --m
 159        memory_end   = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE;
 160
 161        m68k_num_memory=1;
 162        m68k_memory[0].size=*(romvec->pv_sun3mem);
 163
 164        sun3_bootmem_alloc(memory_start, memory_end);
 165}
 166
 167void __init sun3_sched_init(irq_handler_t timer_routine)
 168{
 169        sun3_disable_interrupts();
 170        intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE);
 171        intersil_clock->int_reg=INTERSIL_HZ_100_MASK;
 172        intersil_clear();
 173        sun3_enable_irq(5);
 174        intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE);
 175        sun3_enable_interrupts();
 176        intersil_clear();
 177}
 178
 179