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/seq_file.h>
  15#include <linux/tty.h>
  16#include <linux/console.h>
  17#include <linux/init.h>
  18#include <linux/bootmem.h>
  19
  20#include <asm/oplib.h>
  21#include <asm/setup.h>
  22#include <asm/contregs.h>
  23#include <asm/movs.h>
  24#include <asm/pgtable.h>
  25#include <asm/pgalloc.h>
  26#include <asm/sun3-head.h>
  27#include <asm/sun3mmu.h>
  28#include <asm/rtc.h>
  29#include <asm/machdep.h>
  30#include <asm/idprom.h>
  31#include <asm/intersil.h>
  32#include <asm/irq.h>
  33#include <asm/sections.h>
  34#include <asm/segment.h>
  35#include <asm/sun3ints.h>
  36
  37char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
  38
  39extern u32 sun3_gettimeoffset(void);
  40static void sun3_sched_init(irq_handler_t handler);
  41extern void sun3_get_model (char* model);
  42extern int sun3_hwclk(int set, struct rtc_time *t);
  43
  44volatile char* clock_va;
  45extern unsigned long availmem;
  46unsigned long num_pages;
  47
  48static void sun3_get_hardware_list(struct seq_file *m)
  49{
  50        seq_printf(m, "PROM Revision:\t%s\n", romvec->pv_monid);
  51}
  52
  53void __init sun3_init(void)
  54{
  55        unsigned char enable_register;
  56        int i;
  57
  58        m68k_machtype= MACH_SUN3;
  59        m68k_cputype = CPU_68020;
  60        m68k_fputype = FPU_68881; /* mc68881 actually */
  61        m68k_mmutype = MMU_SUN3;
  62        clock_va    =          (char *) 0xfe06000;      /* dark  */
  63        sun3_intreg = (unsigned char *) 0xfe0a000;      /* magic */
  64        sun3_disable_interrupts();
  65
  66        prom_init((void *)LINUX_OPPROM_BEGVM);
  67
  68        GET_CONTROL_BYTE(AC_SENABLE,enable_register);
  69        enable_register |= 0x50; /* Enable FPU */
  70        SET_CONTROL_BYTE(AC_SENABLE,enable_register);
  71        GET_CONTROL_BYTE(AC_SENABLE,enable_register);
  72
  73        /* This code looks suspicious, because it doesn't subtract
  74           memory belonging to the kernel from the available space */
  75
  76
  77        memset(sun3_reserved_pmeg, 0, sizeof(sun3_reserved_pmeg));
  78
  79        /* Reserve important PMEGS */
  80        /* FIXME: These should be probed instead of hardcoded */
  81
  82        for (i=0; i<8; i++)             /* Kernel PMEGs */
  83                sun3_reserved_pmeg[i] = 1;
  84
  85        sun3_reserved_pmeg[247] = 1;    /* ROM mapping  */
  86        sun3_reserved_pmeg[248] = 1;    /* AMD Ethernet */
  87        sun3_reserved_pmeg[251] = 1;    /* VB area      */
  88        sun3_reserved_pmeg[254] = 1;    /* main I/O     */
  89
  90        sun3_reserved_pmeg[249] = 1;
  91        sun3_reserved_pmeg[252] = 1;
  92        sun3_reserved_pmeg[253] = 1;
  93        set_fs(KERNEL_DS);
  94}
  95
  96/* Without this, Bad Things happen when something calls arch_reset. */
  97static void sun3_reboot (void)
  98{
  99        prom_reboot ("vmlinux");
 100}
 101
 102static void sun3_halt (void)
 103{
 104        prom_halt ();
 105}
 106
 107/* sun3 bootmem allocation */
 108
 109static void __init sun3_bootmem_alloc(unsigned long memory_start,
 110                                      unsigned long memory_end)
 111{
 112        unsigned long start_page;
 113
 114        /* align start/end to page boundaries */
 115        memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK);
 116        memory_end = memory_end & PAGE_MASK;
 117
 118        start_page = __pa(memory_start) >> PAGE_SHIFT;
 119        num_pages = __pa(memory_end) >> PAGE_SHIFT;
 120
 121        high_memory = (void *)memory_end;
 122        availmem = memory_start;
 123
 124        m68k_setup_node(0);
 125        availmem += init_bootmem_node(NODE_DATA(0), start_page, 0, num_pages);
 126        availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK;
 127
 128        free_bootmem(__pa(availmem), memory_end - (availmem));
 129}
 130
 131
 132void __init config_sun3(void)
 133{
 134        unsigned long memory_start, memory_end;
 135
 136        printk("ARCH: SUN3\n");
 137        idprom_init();
 138
 139        /* Subtract kernel memory from available memory */
 140
 141        mach_sched_init      =  sun3_sched_init;
 142        mach_init_IRQ        =  sun3_init_IRQ;
 143        mach_reset           =  sun3_reboot;
 144        arch_gettimeoffset   =  sun3_gettimeoffset;
 145        mach_get_model       =  sun3_get_model;
 146        mach_hwclk           =  sun3_hwclk;
 147        mach_halt            =  sun3_halt;
 148        mach_get_hardware_list = sun3_get_hardware_list;
 149
 150        memory_start = ((((unsigned long)_end) + 0x2000) & ~0x1fff);
 151// PROM seems to want the last couple of physical pages. --m
 152        memory_end   = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE;
 153
 154        m68k_num_memory=1;
 155        m68k_memory[0].size=*(romvec->pv_sun3mem);
 156
 157        sun3_bootmem_alloc(memory_start, memory_end);
 158}
 159
 160static void __init sun3_sched_init(irq_handler_t timer_routine)
 161{
 162        sun3_disable_interrupts();
 163        intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE);
 164        intersil_clock->int_reg=INTERSIL_HZ_100_MASK;
 165        intersil_clear();
 166        sun3_enable_irq(5);
 167        intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE);
 168        sun3_enable_interrupts();
 169        intersil_clear();
 170}
 171
 172