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 34 extern char _text, _end; 35 36 char sun3_reserved_pmeg[SUN3_PMEGS_NUM]; 37 38 extern unsigned long sun3_gettimeoffset(void); 39 extern void sun3_sched_init(irq_handler_t handler); 40 extern void sun3_get_model (char* model); 41 extern void idprom_init (void); 42 extern int sun3_hwclk(int set, struct rtc_time *t); 43 44 volatile char* clock_va; 45 extern volatile unsigned char* sun3_intreg; 46 extern unsigned long availmem; 47 unsigned long num_pages; 48 49 static 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 61 void __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 /* FIXME: These should be probed instead of hardcoded */ 89 90 for (i=0; i<8; i++) /* Kernel PMEGs */ 91 sun3_reserved_pmeg[i] = 1; 92 93 sun3_reserved_pmeg[247] = 1; /* ROM mapping */ 94 sun3_reserved_pmeg[248] = 1; /* AMD Ethernet */ 95 sun3_reserved_pmeg[251] = 1; /* VB area */ 96 sun3_reserved_pmeg[254] = 1; /* main I/O */ 97 98 sun3_reserved_pmeg[249] = 1; 99 sun3_reserved_pmeg[252] = 1; 100 sun3_reserved_pmeg[253] = 1; 101 set_fs(KERNEL_DS); 102 } 103 104 /* Without this, Bad Things happen when something calls arch_reset. */ 105 static void sun3_reboot (void) 106 { 107 prom_reboot ("vmlinux"); 108 } 109 110 static void sun3_halt (void) 111 { 112 prom_halt (); 113 } 114 115 /* sun3 bootmem allocation */ 116 117 void __init sun3_bootmem_alloc(unsigned long memory_start, unsigned long memory_end) 118 { 119 unsigned long start_page; 120 121 /* align start/end to page boundaries */ 122 memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK); 123 memory_end = memory_end & PAGE_MASK; 124 125 start_page = __pa(memory_start) >> PAGE_SHIFT; 126 num_pages = __pa(memory_end) >> PAGE_SHIFT; 127 128 high_memory = (void *)memory_end; 129 availmem = memory_start; 130 131 m68k_setup_node(0); 132 availmem += init_bootmem_node(NODE_DATA(0), start_page, 0, num_pages); 133 availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK; 134 135 free_bootmem(__pa(availmem), memory_end - (availmem)); 136 } 137 138 139 void __init config_sun3(void) 140 { 141 unsigned long memory_start, memory_end; 142 143 printk("ARCH: SUN3\n"); 144 idprom_init(); 145 146 /* Subtract kernel memory from available memory */ 147 148 mach_sched_init = sun3_sched_init; 149 mach_init_IRQ = sun3_init_IRQ; 150 mach_reset = sun3_reboot; 151 mach_gettimeoffset = sun3_gettimeoffset; 152 mach_get_model = sun3_get_model; 153 mach_hwclk = sun3_hwclk; 154 mach_halt = sun3_halt; 155 mach_get_hardware_list = sun3_get_hardware_list; 156 157 memory_start = ((((int)&_end) + 0x2000) & ~0x1fff); 158 // PROM seems to want the last couple of physical pages. --m 159 memory_end = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE; 160 161 m68k_num_memory=1; 162 m68k_memory[0].size=*(romvec->pv_sun3mem); 163 164 sun3_bootmem_alloc(memory_start, memory_end); 165 } 166 167 void __init sun3_sched_init(irq_handler_t timer_routine) 168 { 169 sun3_disable_interrupts(); 170 intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE); 171 intersil_clock->int_reg=INTERSIL_HZ_100_MASK; 172 intersil_clear(); 173 sun3_enable_irq(5); 174 intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE); 175 sun3_enable_interrupts(); 176 intersil_clear(); 177 } 178 179