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 34extern char _text, _end; 35 36char sun3_reserved_pmeg[SUN3_PMEGS_NUM]; 37 38extern unsigned long sun3_gettimeoffset(void); 39extern void sun3_sched_init(irq_handler_t handler); 40extern void sun3_get_model (char* model); 41extern void idprom_init (void); 42extern int sun3_hwclk(int set, struct rtc_time *t); 43 44volatile char* clock_va; 45extern volatile unsigned char* sun3_intreg; 46extern unsigned long availmem; 47unsigned long num_pages; 48 49static 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 61void __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 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. */ 104static void sun3_reboot (void) 105{ 106 prom_reboot ("vmlinux"); 107} 108 109static void sun3_halt (void) 110{ 111 prom_halt (); 112} 113 114/* sun3 bootmem allocation */ 115 116void __init sun3_bootmem_alloc(unsigned long memory_start, unsigned long memory_end) 117{ 118 unsigned long start_page; 119 120 /* align start/end to page boundaries */ 121 memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK); 122 memory_end = memory_end & PAGE_MASK; 123 124 start_page = __pa(memory_start) >> PAGE_SHIFT; 125 num_pages = __pa(memory_end) >> PAGE_SHIFT; 126 127 high_memory = (void *)memory_end; 128 availmem = memory_start; 129 130 m68k_setup_node(0); 131 availmem += init_bootmem_node(NODE_DATA(0), start_page, 0, num_pages); 132 availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK; 133 134 free_bootmem(__pa(availmem), memory_end - (availmem)); 135} 136 137 138void __init config_sun3(void) 139{ 140 unsigned long memory_start, memory_end; 141 142 printk("ARCH: SUN3\n"); 143 idprom_init(); 144 145 /* Subtract kernel memory from available memory */ 146 147 mach_sched_init = sun3_sched_init; 148 mach_init_IRQ = sun3_init_IRQ; 149 mach_reset = sun3_reboot; 150 mach_gettimeoffset = sun3_gettimeoffset; 151 mach_get_model = sun3_get_model; 152 mach_hwclk = sun3_hwclk; 153 mach_halt = sun3_halt; 154 mach_get_hardware_list = sun3_get_hardware_list; 155 156 memory_start = ((((int)&_end) + 0x2000) & ~0x1fff); 157// PROM seems to want the last couple of physical pages. --m 158 memory_end = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE; 159 160 m68k_num_memory=1; 161 m68k_memory[0].size=*(romvec->pv_sun3mem); 162 163 sun3_bootmem_alloc(memory_start, memory_end); 164} 165 166void __init sun3_sched_init(irq_handler_t timer_routine) 167{ 168 sun3_disable_interrupts(); 169 intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE); 170 intersil_clock->int_reg=INTERSIL_HZ_100_MASK; 171 intersil_clear(); 172 sun3_enable_irq(5); 173 intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE); 174 sun3_enable_interrupts(); 175 intersil_clear(); 176} 177