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
  37 char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
  38
  39 extern unsigned long sun3_gettimeoffset(void);
  40 static void sun3_sched_init(irq_handler_t handler);
  41 extern void sun3_get_model (char* model);
  42 extern int sun3_hwclk(int set, struct rtc_time *t);
  43
  44 volatile char* clock_va;
  45 extern unsigned long availmem;
  46 unsigned long num_pages;
  47
  48 static void sun3_get_hardware_list(struct seq_file *m)
  49 {
  50         seq_printf(m, "PROM Revision:\t%s\n", romvec->pv_monid);
  51 }
  52
  53 void __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. */
  97 static void sun3_reboot (void)
  98 {
  99         prom_reboot ("vmlinux");
 100 }
 101
 102 static void sun3_halt (void)
 103 {
 104         prom_halt ();
 105 }
 106
 107 /* sun3 bootmem allocation */
 108
 109 static 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
 132 void __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         mach_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
 160 static 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