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 #include <linux/bootmem.h>
  22
  23 #include <asm/oplib.h>
  24 #include <asm/setup.h>
  25 #include <asm/contregs.h>
  26 #include <asm/movs.h>
  27 #include <asm/pgtable.h>
  28 #include <asm/sun3-head.h>
  29 #include <asm/sun3mmu.h>
  30 #include <asm/machdep.h>
  31 #include <asm/intersil.h>
  32 #include <asm/irq.h>
  33 #include <asm/segment.h>
  34
  35 extern char _text, _end;
  36
  37 char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
  38
  39 extern 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 (char* model);
  52 extern void idprom_init (void);
  53 extern void sun3_gettod (int *yearp, int *monp, int *dayp,
  54                    int *hourp, int *minp, int *secp);
  55 extern int sun3_hwclk(int set, struct hwclk_time *t);
  56
  57 extern void sun_serial_setup(void);
  58 volatile char* clock_va;
  59 extern unsigned char* sun3_intreg;
  60 extern unsigned long availmem;
  61 unsigned long num_pages;
  62
  63 void __init sun3_init(void)
  64 {
  65         unsigned char enable_register;
  66         int i;
  67
  68         m68k_machtype= MACH_SUN3;
  69         m68k_cputype = CPU_68020;
  70         m68k_fputype = FPU_68881; /* mc68881 actually */
  71         m68k_mmutype = MMU_SUN3;
  72         clock_va    =          (char *) 0xfe06000;      /* dark  */
  73         sun3_intreg = (unsigned char *) 0xfe0a000;      /* magic */
  74         sun3_disable_interrupts();
  75
  76         prom_init((void *)LINUX_OPPROM_BEGVM);
  77
  78         GET_CONTROL_BYTE(AC_SENABLE,enable_register);
  79         enable_register |= 0x40; /* Enable FPU */
  80         SET_CONTROL_BYTE(AC_SENABLE,enable_register);
  81         GET_CONTROL_BYTE(AC_SENABLE,enable_register);
  82
  83         /* This code looks suspicious, because it doesn't subtract
  84            memory belonging to the kernel from the available space */
  85
  86
  87         memset(sun3_reserved_pmeg, 0, sizeof(sun3_reserved_pmeg));
  88
  89         /* Reserve important PMEGS */
  90         /* FIXME: These should be probed instead of hardcoded */
  91
  92         for (i=0; i<8; i++)             /* Kernel PMEGs */
  93                 sun3_reserved_pmeg[i] = 1;
  94
  95         sun3_reserved_pmeg[247] = 1;    /* ROM mapping  */
  96         sun3_reserved_pmeg[248] = 1;    /* AMD Ethernet */
  97         sun3_reserved_pmeg[251] = 1;    /* VB area      */
  98         sun3_reserved_pmeg[254] = 1;    /* main I/O     */
  99
 100         sun3_reserved_pmeg[249] = 1;
 101         sun3_reserved_pmeg[252] = 1;
 102         sun3_reserved_pmeg[253] = 1;
 103         set_fs(KERNEL_DS);
 104 }
 105
 106 /* Without this, Bad Things happen when something calls arch_reset. */
 107 static void sun3_reboot (void)
 108 {
 109         prom_reboot ("vmlinux");
 110 }
 111
 112 static void sun3_halt (void)
 113 {
 114         prom_halt ();
 115 }
 116
 117 /* sun3 bootmem allocation */
 118
 119 void __init sun3_bootmem_alloc(unsigned long memory_start, unsigned long memory_end)
 120 {
 121         unsigned long start_page;
 122
 123         /* align start/end to page boundries */
 124         memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK);
 125         memory_end = memory_end & PAGE_MASK;
 126
 127         start_page = __pa(memory_start) >> PAGE_SHIFT;
 128         num_pages = __pa(memory_end) >> PAGE_SHIFT;
 129
 130         high_memory = (void *)memory_end;
 131         availmem = memory_start;
 132
 133         availmem += init_bootmem(start_page, num_pages);
 134         availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK;
 135
 136         free_bootmem(__pa(availmem), memory_end - (availmem));
 137 }
 138
 139
 140 void __init config_sun3(void)
 141 {
 142         unsigned long memory_start, memory_end;
 143
 144         printk("ARCH: SUN3\n");
 145         idprom_init();
 146
 147         /* Subtract kernel memory from available memory */
 148
 149         mach_sched_init      =  sun3_sched_init;
 150         mach_init_IRQ        =  sun3_init_IRQ;
 151         mach_default_handler = &sun3_default_handler;
 152         mach_request_irq     =  sun3_request_irq;
 153         mach_free_irq        =  sun3_free_irq;
 154 //      mach_keyb_init       =  sun3_keyb_init;
 155         enable_irq           =  sun3_enable_irq;
 156         disable_irq          =  sun3_disable_irq;
 157         mach_get_irq_list    =  sun3_get_irq_list;
 158         mach_gettod          =  sun3_gettod;
 159         mach_reset           =  sun3_reboot;
 160         mach_gettimeoffset   =  sun3_gettimeoffset;
 161         mach_get_model       =  sun3_get_model;
 162         mach_hwclk           =  sun3_hwclk;
 163         mach_halt            =  sun3_halt;
 164 #ifndef CONFIG_SERIAL_CONSOLE
 165         conswitchp           = &dummy_con;
 166 #endif
 167
 168         memory_start = ((((int)&_end) + 0x2000) & ~0x1fff);
 169 // PROM seems to want the last couple of physical pages. --m
 170         memory_end   = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE;
 171
 172         m68k_num_memory=1;
 173         m68k_memory[0].size=*(romvec->pv_sun3mem);
 174
 175         sun3_bootmem_alloc(memory_start, memory_end);
 176
 177         sun_serial_setup();
 178
 179
 180 }
 181
 182 void __init sun3_sched_init(void (*timer_routine)(int, void *, struct pt_regs *))
 183 {
 184         sun3_disable_interrupts();
 185         intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE);
 186         intersil_clock->int_reg=INTERSIL_HZ_100_MASK;
 187         intersil_clear();
 188         sun3_enable_irq(5);
 189         intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE);
 190         sun3_enable_interrupts();
 191         intersil_clear();
 192 }
 193