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/seq_file.h> 15#include <linux/tty.h> 16#include <linux/console.h> 17#include <linux/init.h> 18#include <linux/bootmem.h> 19 20#include <asm/oplib.h> 21#include <asm/setup.h> 22#include <asm/contregs.h> 23#include <asm/movs.h> 24#include <asm/pgtable.h> 25#include <asm/pgalloc.h> 26#include <asm/sun3-head.h> 27#include <asm/sun3mmu.h> 28#include <asm/rtc.h> 29#include <asm/machdep.h> 30#include <asm/idprom.h> 31#include <asm/intersil.h> 32#include <asm/irq.h> 33#include <asm/sections.h> 34#include <asm/segment.h> 35#include <asm/sun3ints.h> 36 37char sun3_reserved_pmeg[SUN3_PMEGS_NUM]; 38 39extern unsigned long sun3_gettimeoffset(void); 40static void sun3_sched_init(irq_handler_t handler); 41extern void sun3_get_model (char* model); 42extern int sun3_hwclk(int set, struct rtc_time *t); 43 44volatile char* clock_va; 45extern unsigned long availmem; 46unsigned long num_pages; 47 48static void sun3_get_hardware_list(struct seq_file *m) 49{ 50 seq_printf(m, "PROM Revision:\t%s\n", romvec->pv_monid); 51} 52 53void __init sun3_init(void) 54{ 55 unsigned char enable_register; 56 int i; 57 58 m68k_machtype= MACH_SUN3; 59 m68k_cputype = CPU_68020; 60 m68k_fputype = FPU_68881; /* mc68881 actually */ 61 m68k_mmutype = MMU_SUN3; 62 clock_va = (char *) 0xfe06000; /* dark */ 63 sun3_intreg = (unsigned char *) 0xfe0a000; /* magic */ 64 sun3_disable_interrupts(); 65 66 prom_init((void *)LINUX_OPPROM_BEGVM); 67 68 GET_CONTROL_BYTE(AC_SENABLE,enable_register); 69 enable_register |= 0x50; /* Enable FPU */ 70 SET_CONTROL_BYTE(AC_SENABLE,enable_register); 71 GET_CONTROL_BYTE(AC_SENABLE,enable_register); 72 73 /* This code looks suspicious, because it doesn't subtract 74 memory belonging to the kernel from the available space */ 75 76 77 memset(sun3_reserved_pmeg, 0, sizeof(sun3_reserved_pmeg)); 78 79 /* Reserve important PMEGS */ 80 81 for (i=0; i<8; i++) /* Kernel PMEGs */ 82 sun3_reserved_pmeg[i] = 1; 83 84 sun3_reserved_pmeg[247] = 1; /* ROM mapping */ 85 sun3_reserved_pmeg[248] = 1; /* AMD Ethernet */ 86 sun3_reserved_pmeg[251] = 1; /* VB area */ 87 sun3_reserved_pmeg[254] = 1; /* main I/O */ 88 89 sun3_reserved_pmeg[249] = 1; 90 sun3_reserved_pmeg[252] = 1; 91 sun3_reserved_pmeg[253] = 1; 92 set_fs(KERNEL_DS); 93} 94 95/* Without this, Bad Things happen when something calls arch_reset. */ 96static void sun3_reboot (void) 97{ 98 prom_reboot ("vmlinux"); 99} 100 101static void sun3_halt (void) 102{ 103 prom_halt (); 104} 105 106/* sun3 bootmem allocation */ 107 108static void __init sun3_bootmem_alloc(unsigned long memory_start, 109 unsigned long memory_end) 110{ 111 unsigned long start_page; 112 113 /* align start/end to page boundaries */ 114 memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK); 115 memory_end = memory_end & PAGE_MASK; 116 117 start_page = __pa(memory_start) >> PAGE_SHIFT; 118 num_pages = __pa(memory_end) >> PAGE_SHIFT; 119 120 high_memory = (void *)memory_end; 121 availmem = memory_start; 122 123 m68k_setup_node(0); 124 availmem += init_bootmem_node(NODE_DATA(0), start_page, 0, num_pages); 125 availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK; 126 127 free_bootmem(__pa(availmem), memory_end - (availmem)); 128} 129 130 131void __init config_sun3(void) 132{ 133 unsigned long memory_start, memory_end; 134 135 printk("ARCH: SUN3\n"); 136 idprom_init(); 137 138 /* Subtract kernel memory from available memory */ 139 140 mach_sched_init = sun3_sched_init; 141 mach_init_IRQ = sun3_init_IRQ; 142 mach_reset = sun3_reboot; 143 mach_gettimeoffset = sun3_gettimeoffset; 144 mach_get_model = sun3_get_model; 145 mach_hwclk = sun3_hwclk; 146 mach_halt = sun3_halt; 147 mach_get_hardware_list = sun3_get_hardware_list; 148 149 memory_start = ((((unsigned long)_end) + 0x2000) & ~0x1fff); 150// PROM seems to want the last couple of physical pages. --m 151 memory_end = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE; 152 153 m68k_num_memory=1; 154 m68k_memory[0].size=*(romvec->pv_sun3mem); 155 156 sun3_bootmem_alloc(memory_start, memory_end); 157} 158 159static void __init sun3_sched_init(irq_handler_t timer_routine) 160{ 161 sun3_disable_interrupts(); 162 intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE); 163 intersil_clock->int_reg=INTERSIL_HZ_100_MASK; 164 intersil_clear(); 165 sun3_enable_irq(5); 166 intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE); 167 sun3_enable_interrupts(); 168 intersil_clear(); 169} 170