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 <stdarg.h>
  12
  13 #include <linux/config.h>
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/mm.h>
  17 #include <linux/kd.h>
  18 #include <linux/tty.h>
  19 #include <linux/console.h>
  20 #include <linux/init.h>
  21
  22 #include <asm/oplib.h>
  23 #include <asm/setup.h>
  24 #include <asm/contregs.h>
  25 #include <asm/movs.h>
  26 #include <asm/pgtable.h>
  27 #include <asm/sun3-head.h>
  28 #include <asm/sun3mmu.h>
  29 #include <asm/machdep.h>
  30 #include <asm/intersil.h>
  31 #include <asm/irq.h>
  32 #include <asm/segment.h>
  33
  34 extern char _text, _end;
  35
  36 static int kernel_start, kernel_end;
  37 char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
  38
  39 static unsigned long sun3_gettimeoffset(void);
  40 extern int sun3_get_irq_list (char *);
  41 extern void sun3_sched_init(void (*handler)(int, void *, struct pt_regs *));
  42 extern void sun3_init_IRQ (void);
  43 extern void (*sun3_default_handler[]) (int, void *, struct pt_regs *);
  44 extern int sun3_request_irq (unsigned int irq, void (*handler)(int, void *, struct pt_regs *),
  45                               unsigned long flags, const char *devname, void *dev_id);
  46 extern void sun3_free_irq (unsigned int irq, void *dev_id);
  47 extern void sun3_enable_irq (unsigned int);
  48 extern void sun3_disable_irq (unsigned int);
  49 extern void sun3_enable_interrupts (void);
  50 extern void sun3_disable_interrupts (void);
  51 extern void sun3_get_model (unsigned char* model);
  52 extern void idprom_init (void);
  53 void sun3_gettod (int *yearp, int *monp, int *dayp,
  54                    int *hourp, int *minp, int *secp);
  55
  56 extern unsigned long sun_serial_setup(unsigned long memory_start);
  57 volatile char* clock_va;
  58 extern unsigned char* sun3_intreg;
  59
  60 void __init sun3_init(void)
  61 {
  62         unsigned char enable_register;
  63         int i;
  64
  65         m68k_machtype= MACH_SUN3;
  66         m68k_cputype = CPU_68020;
  67         m68k_fputype = FPU_68881; /* mc68881 actually */
  68         m68k_mmutype = MMU_SUN3;
  69         clock_va    =          (char *) 0xfe06000;      /* dark  */
  70         sun3_intreg = (unsigned char *) 0xfe0a000;      /* magic */
  71         sun3_disable_interrupts();
  72
  73         prom_init((void *)LINUX_OPPROM_BEGVM);
  74
  75         GET_CONTROL_BYTE(AC_SENABLE,enable_register);
  76         enable_register |= 0x40; /* Enable FPU */
  77         SET_CONTROL_BYTE(AC_SENABLE,enable_register);
  78         GET_CONTROL_BYTE(AC_SENABLE,enable_register);
  79
  80         /* This code looks suspicious, because it doesn't subtract
  81            memory belonging to the kernel from the available space */
  82
  83
  84         memset(sun3_reserved_pmeg, 0, sizeof(sun3_reserved_pmeg));
  85
  86         /* Reserve important PMEGS */
  87         /* FIXME: These should be probed instead of hardcoded */
  88
  89         for (i=0; i<8; i++)             /* Kernel PMEGs */
  90                 sun3_reserved_pmeg[i] = 1;
  91
  92         sun3_reserved_pmeg[247] = 1;    /* ROM mapping  */
  93         sun3_reserved_pmeg[248] = 1;    /* AMD Ethernet */
  94         sun3_reserved_pmeg[251] = 1;    /* VB area      */
  95         sun3_reserved_pmeg[254] = 1;    /* main I/O     */
  96
  97         sun3_reserved_pmeg[249] = 1;
  98         sun3_reserved_pmeg[252] = 1;
  99         sun3_reserved_pmeg[253] = 1;
 100         set_fs(KERNEL_DS);
 101 }
 102
 103 /* Without this, Bad Things happen when something calls arch_reset. */
 104 static void sun3_reboot (void)
 105 {
 106         prom_reboot ("vmlinux");
 107 }
 108
 109 void __init config_sun3(unsigned long *start_mem_p, unsigned long *end_mem_p)
 110 {
 111         printk("ARCH: SUN3\n");
 112         idprom_init();
 113
 114         /* Subtract kernel memory from available memory */
 115
 116         mach_sched_init      =  sun3_sched_init;
 117         mach_init_IRQ        =  sun3_init_IRQ;
 118         mach_default_handler = &sun3_default_handler;
 119         mach_request_irq     =  sun3_request_irq;
 120         mach_free_irq        =  sun3_free_irq;
 121 //      mach_keyb_init       =  sun3_keyb_init;
 122         enable_irq           =  sun3_enable_irq;
 123         disable_irq          =  sun3_disable_irq;
 124         mach_get_irq_list    =  sun3_get_irq_list;
 125         mach_gettod          =  sun3_gettod;
 126         mach_reset           =  sun3_reboot;
 127         mach_gettimeoffset   =  sun3_gettimeoffset;
 128         mach_get_model       =  sun3_get_model;
 129 #ifndef CONFIG_SERIAL_CONSOLE
 130         conswitchp           = &dummy_con;
 131 #endif
 132         kernel_start = 0x00000000; /* NOT &_text */
 133         kernel_end   = ((((int)&_end) + 0x2000) & ~0x1fff) - 1;
 134
 135         *start_mem_p = kernel_end + 1;
 136 // PROM seems to want the last couple of physical pages. --m
 137         *end_mem_p   = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE;
 138         m68k_num_memory=1;
 139         m68k_memory[0].size=*(romvec->pv_sun3mem);
 140
 141         *start_mem_p = sun_serial_setup(*start_mem_p);
 142 }
 143
 144 void __init sun3_sched_init(void (*timer_routine)(int, void *, struct pt_regs *))
 145 {
 146         sun3_disable_interrupts();
 147         intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE);
 148         intersil_clock->int_reg=INTERSIL_HZ_100_MASK;
 149         intersil_clear();
 150         sun3_enable_irq(5);
 151         intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE);
 152         sun3_enable_interrupts();
 153         intersil_clear();
 154 }
 155
 156 static unsigned long sun3_gettimeoffset(void)
 157 {
 158   return 1;
 159 }
 160
 161 void sun3_gettod (int *yearp, int *monp, int *dayp,
 162                    int *hourp, int *minp, int *secp)
 163 {
 164         struct intersil_dt* todintersil;
 165         todintersil = (struct intersil_dt *) &intersil_clock->counter;
 166         *secp  = todintersil->second;
 167         *minp  = todintersil->minute;
 168         *hourp = todintersil->hour;
 169         *dayp  = todintersil->day;
 170         *monp  = todintersil->month;
 171         *yearp = todintersil->year+68; /* The base year for sun3 is 1968 */
 172 }
 173