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
  34 extern char _text, _end;
  35
  36 char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
  37
  38 extern unsigned long sun3_gettimeoffset(void);
  39 extern void sun3_sched_init(irq_handler_t handler);
  40 extern void sun3_get_model (char* model);
  41 extern void idprom_init (void);
  42 extern int sun3_hwclk(int set, struct rtc_time *t);
  43
  44 volatile char* clock_va;
  45 extern volatile unsigned char* sun3_intreg;
  46 extern unsigned long availmem;
  47 unsigned long num_pages;
  48
  49 static 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
  61 void __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. */
 105 static void sun3_reboot (void)
 106 {
 107         prom_reboot ("vmlinux");
 108 }
 109
 110 static void sun3_halt (void)
 111 {
 112         prom_halt ();
 113 }
 114
 115 /* sun3 bootmem allocation */
 116
 117 void __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
 139 void __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
 167 void __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