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/sun3-head.h> 25 #include <asm/sun3mmu.h> 26 #include <asm/rtc.h> 27 #include <asm/machdep.h> 28 #include <asm/intersil.h> 29 #include <asm/irq.h> 30 #include <asm/segment.h> 31 #include <asm/sun3ints.h> 32 33 extern char _text, _end; 34 35 char sun3_reserved_pmeg[SUN3_PMEGS_NUM]; 36 37 extern unsigned long sun3_gettimeoffset(void); 38 extern void sun3_sched_init(irqreturn_t (*handler)(int, void *, struct pt_regs *)); 39 extern void sun3_get_model (char* model); 40 extern void idprom_init (void); 41 extern int sun3_hwclk(int set, struct rtc_time *t); 42 43 volatile char* clock_va; 44 extern volatile unsigned char* sun3_intreg; 45 extern unsigned long availmem; 46 unsigned long num_pages; 47 48 static int sun3_get_hardware_list(char *buffer) 49 { 50 51 int len = 0; 52 53 len += sprintf(buffer + len, "PROM Revision:\t%s\n", 54 romvec->pv_monid); 55 56 return len; 57 58 } 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 |= 0x50; /* 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 void sun3_reboot (void) 105 { 106 prom_reboot ("vmlinux"); 107 } 108 109 static void sun3_halt (void) 110 { 111 prom_halt (); 112 } 113 114 /* sun3 bootmem allocation */ 115 116 void __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 availmem += init_bootmem_node(NODE_DATA(0), start_page, 0, num_pages); 131 availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK; 132 133 free_bootmem(__pa(availmem), memory_end - (availmem)); 134 } 135 136 137 void __init config_sun3(void) 138 { 139 unsigned long memory_start, memory_end; 140 141 printk("ARCH: SUN3\n"); 142 idprom_init(); 143 144 /* Subtract kernel memory from available memory */ 145 146 mach_sched_init = sun3_sched_init; 147 mach_init_IRQ = sun3_init_IRQ; 148 mach_reset = sun3_reboot; 149 mach_gettimeoffset = sun3_gettimeoffset; 150 mach_get_model = sun3_get_model; 151 mach_hwclk = sun3_hwclk; 152 mach_halt = sun3_halt; 153 mach_get_hardware_list = sun3_get_hardware_list; 154 155 memory_start = ((((int)&_end) + 0x2000) & ~0x1fff); 156 // PROM seems to want the last couple of physical pages. --m 157 memory_end = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE; 158 159 m68k_num_memory=1; 160 m68k_memory[0].size=*(romvec->pv_sun3mem); 161 162 sun3_bootmem_alloc(memory_start, memory_end); 163 } 164 165 void __init sun3_sched_init(irqreturn_t (*timer_routine)(int, void *, struct pt_regs *)) 166 { 167 sun3_disable_interrupts(); 168 intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE); 169 intersil_clock->int_reg=INTERSIL_HZ_100_MASK; 170 intersil_clear(); 171 sun3_enable_irq(5); 172 intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE); 173 sun3_enable_interrupts(); 174 intersil_clear(); 175 } 176 177