2 * linux/arch/m68k/sun3/config.c
4 * Copyright (C) 1996,1997 Pekka Pietik{inen
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
11 #include <linux/types.h>
12 #include <linux/kernel.h>
14 #include <linux/tty.h>
15 #include <linux/console.h>
16 #include <linux/init.h>
17 #include <linux/bootmem.h>
19 #include <asm/oplib.h>
20 #include <asm/setup.h>
21 #include <asm/contregs.h>
23 #include <asm/pgtable.h>
24 #include <asm/pgalloc.h>
25 #include <asm/sun3-head.h>
26 #include <asm/sun3mmu.h>
28 #include <asm/machdep.h>
29 #include <asm/intersil.h>
31 #include <asm/segment.h>
32 #include <asm/sun3ints.h>
34 extern char _text, _end;
36 char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
38 extern unsigned long sun3_gettimeoffset(void);
39 static 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);
44 volatile char* clock_va;
45 extern volatile unsigned char* sun3_intreg;
46 extern unsigned long availmem;
47 unsigned long num_pages;
49 static int sun3_get_hardware_list(char *buffer)
54 len += sprintf(buffer + len, "PROM Revision:\t%s\n",
61 void __init sun3_init(void)
63 unsigned char enable_register;
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();
74 prom_init((void *)LINUX_OPPROM_BEGVM);
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);
81 /* This code looks suspicious, because it doesn't subtract
82 memory belonging to the kernel from the available space */
85 memset(sun3_reserved_pmeg, 0, sizeof(sun3_reserved_pmeg));
87 /* Reserve important PMEGS */
88 /* FIXME: These should be probed instead of hardcoded */
90 for (i=0; i<8; i++) /* Kernel PMEGs */
91 sun3_reserved_pmeg[i] = 1;
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 */
98 sun3_reserved_pmeg[249] = 1;
99 sun3_reserved_pmeg[252] = 1;
100 sun3_reserved_pmeg[253] = 1;
104 /* Without this, Bad Things happen when something calls arch_reset. */
105 static void sun3_reboot (void)
107 prom_reboot ("vmlinux");
110 static void sun3_halt (void)
115 /* sun3 bootmem allocation */
117 static void __init sun3_bootmem_alloc(unsigned long memory_start,
118 unsigned long memory_end)
120 unsigned long start_page;
122 /* align start/end to page boundaries */
123 memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK);
124 memory_end = memory_end & PAGE_MASK;
126 start_page = __pa(memory_start) >> PAGE_SHIFT;
127 num_pages = __pa(memory_end) >> PAGE_SHIFT;
129 high_memory = (void *)memory_end;
130 availmem = memory_start;
133 availmem += init_bootmem_node(NODE_DATA(0), start_page, 0, num_pages);
134 availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK;
136 free_bootmem(__pa(availmem), memory_end - (availmem));
140 void __init config_sun3(void)
142 unsigned long memory_start, memory_end;
144 printk("ARCH: SUN3\n");
147 /* Subtract kernel memory from available memory */
149 mach_sched_init = sun3_sched_init;
150 mach_init_IRQ = sun3_init_IRQ;
151 mach_reset = sun3_reboot;
152 mach_gettimeoffset = sun3_gettimeoffset;
153 mach_get_model = sun3_get_model;
154 mach_hwclk = sun3_hwclk;
155 mach_halt = sun3_halt;
156 mach_get_hardware_list = sun3_get_hardware_list;
158 memory_start = ((((int)&_end) + 0x2000) & ~0x1fff);
159 // PROM seems to want the last couple of physical pages. --m
160 memory_end = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE;
163 m68k_memory[0].size=*(romvec->pv_sun3mem);
165 sun3_bootmem_alloc(memory_start, memory_end);
168 static void __init sun3_sched_init(irq_handler_t timer_routine)
170 sun3_disable_interrupts();
171 intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE);
172 intersil_clock->int_reg=INTERSIL_HZ_100_MASK;
175 intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE);
176 sun3_enable_interrupts();