arch/m68k/sun3/config.c

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 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 externchar _text, _end;
 35
 36 static int kernel_start, kernel_end;
 37 char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
 38
 39 static unsigned longsun3_gettimeoffset(void);
 40 externintsun3_get_irq_list(char*);
 41 externvoidsun3_sched_init(void(*handler)(int,void*,struct pt_regs *));
 42 externvoidsun3_init_IRQ(void);
 43 externvoid(*sun3_default_handler[]) (int,void*,struct pt_regs *);
 44 externintsun3_request_irq(unsigned int irq,void(*handler)(int,void*,struct pt_regs *),
 45 unsigned long flags,const char*devname,void*dev_id);
 46 externvoidsun3_free_irq(unsigned int irq,void*dev_id);
 47 externvoidsun3_enable_irq(unsigned int);
 48 externvoidsun3_disable_irq(unsigned int);
 49 externvoidsun3_enable_interrupts(void);
 50 externvoidsun3_disable_interrupts(void);
 51 externvoidsun3_get_model(unsigned char* model);
 52 externvoididprom_init(void);
 53 voidsun3_gettod(int*yearp,int*monp,int*dayp,
 54 int*hourp,int*minp,int*secp);
 55
 56 externunsigned longsun_serial_setup(unsigned long memory_start);
 57 volatilechar* clock_va;
 58 externunsigned 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 voidsun3_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 longsun3_gettimeoffset(void)
 157 {
 158 return1;
 159 }
 160
 161 voidsun3_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