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 37 char sun3_reserved_pmeg[SUN3_PMEGS_NUM]; 38 39 extern u32 sun3_gettimeoffset(void); 40 static void sun3_sched_init(irq_handler_t handler); 41 extern void sun3_get_model (char* model); 42 extern int sun3_hwclk(int set, struct rtc_time *t); 43 44 volatile char* clock_va; 45 extern unsigned long availmem; 46 unsigned long num_pages; 47 48 static void sun3_get_hardware_list(struct seq_file *m) 49 { 50 seq_printf(m, "PROM Revision:\t%s\n", romvec->pv_monid); 51 } 52 53 void __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 /* FIXME: These should be probed instead of hardcoded */ 81 82 for (i=0; i<8; i++) /* Kernel PMEGs */ 83 sun3_reserved_pmeg[i] = 1; 84 85 sun3_reserved_pmeg[247] = 1; /* ROM mapping */ 86 sun3_reserved_pmeg[248] = 1; /* AMD Ethernet */ 87 sun3_reserved_pmeg[251] = 1; /* VB area */ 88 sun3_reserved_pmeg[254] = 1; /* main I/O */ 89 90 sun3_reserved_pmeg[249] = 1; 91 sun3_reserved_pmeg[252] = 1; 92 sun3_reserved_pmeg[253] = 1; 93 set_fs(KERNEL_DS); 94 } 95 96 /* Without this, Bad Things happen when something calls arch_reset. */ 97 static void sun3_reboot (void) 98 { 99 prom_reboot ("vmlinux"); 100 } 101 102 static void sun3_halt (void) 103 { 104 prom_halt (); 105 } 106 107 /* sun3 bootmem allocation */ 108 109 static void __init sun3_bootmem_alloc(unsigned long memory_start, 110 unsigned long memory_end) 111 { 112 unsigned long start_page; 113 114 /* align start/end to page boundaries */ 115 memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK); 116 memory_end = memory_end & PAGE_MASK; 117 118 start_page = __pa(memory_start) >> PAGE_SHIFT; 119 num_pages = __pa(memory_end) >> PAGE_SHIFT; 120 121 high_memory = (void *)memory_end; 122 availmem = memory_start; 123 124 m68k_setup_node(0); 125 availmem += init_bootmem_node(NODE_DATA(0), start_page, 0, num_pages); 126 availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK; 127 128 free_bootmem(__pa(availmem), memory_end - (availmem)); 129 } 130 131 132 void __init config_sun3(void) 133 { 134 unsigned long memory_start, memory_end; 135 136 printk("ARCH: SUN3\n"); 137 idprom_init(); 138 139 /* Subtract kernel memory from available memory */ 140 141 mach_sched_init = sun3_sched_init; 142 mach_init_IRQ = sun3_init_IRQ; 143 mach_reset = sun3_reboot; 144 arch_gettimeoffset = sun3_gettimeoffset; 145 mach_get_model = sun3_get_model; 146 mach_hwclk = sun3_hwclk; 147 mach_halt = sun3_halt; 148 mach_get_hardware_list = sun3_get_hardware_list; 149 150 memory_start = ((((unsigned long)_end) + 0x2000) & ~0x1fff); 151 // PROM seems to want the last couple of physical pages. --m 152 memory_end = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE; 153 154 m68k_num_memory=1; 155 m68k_memory[0].size=*(romvec->pv_sun3mem); 156 157 sun3_bootmem_alloc(memory_start, memory_end); 158 } 159 160 static void __init sun3_sched_init(irq_handler_t timer_routine) 161 { 162 sun3_disable_interrupts(); 163 intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE); 164 intersil_clock->int_reg=INTERSIL_HZ_100_MASK; 165 intersil_clear(); 166 sun3_enable_irq(5); 167 intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE); 168 sun3_enable_interrupts(); 169 intersil_clear(); 170 } 171 172