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
34extern char _text, _end;
35
36char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
37
38extern unsigned long sun3_gettimeoffset(void);
39extern void sun3_sched_init(irq_handler_t handler);
40extern void sun3_get_model (char* model);
41extern void idprom_init (void);
42extern int sun3_hwclk(int set, struct rtc_time *t);
43
44volatile char* clock_va;
45extern volatile unsigned char* sun3_intreg;
46extern unsigned long availmem;
47unsigned long num_pages;
48
49static 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
61void __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
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. */
104static void sun3_reboot (void)
105{
106	prom_reboot ("vmlinux");
107}
108
109static void sun3_halt (void)
110{
111	prom_halt ();
112}
113
114/* sun3 bootmem allocation */
115
116void __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	m68k_setup_node(0);
131	availmem += init_bootmem_node(NODE_DATA(0), start_page, 0, num_pages);
132	availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK;
133
134	free_bootmem(__pa(availmem), memory_end - (availmem));
135}
136
137
138void __init config_sun3(void)
139{
140	unsigned long memory_start, memory_end;
141
142	printk("ARCH: SUN3\n");
143	idprom_init();
144
145	/* Subtract kernel memory from available memory */
146
147        mach_sched_init      =  sun3_sched_init;
148        mach_init_IRQ        =  sun3_init_IRQ;
149        mach_reset           =  sun3_reboot;
150	mach_gettimeoffset   =  sun3_gettimeoffset;
151	mach_get_model	     =  sun3_get_model;
152	mach_hwclk           =  sun3_hwclk;
153	mach_halt	     =  sun3_halt;
154	mach_get_hardware_list = sun3_get_hardware_list;
155
156	memory_start = ((((int)&_end) + 0x2000) & ~0x1fff);
157// PROM seems to want the last couple of physical pages. --m
158	memory_end   = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE;
159
160	m68k_num_memory=1;
161        m68k_memory[0].size=*(romvec->pv_sun3mem);
162
163	sun3_bootmem_alloc(memory_start, memory_end);
164}
165
166void __init sun3_sched_init(irq_handler_t timer_routine)
167{
168	sun3_disable_interrupts();
169        intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE);
170        intersil_clock->int_reg=INTERSIL_HZ_100_MASK;
171	intersil_clear();
172        sun3_enable_irq(5);
173        intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE);
174        sun3_enable_interrupts();
175        intersil_clear();
176}
177