Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[pandora-kernel.git] / arch / m68k / sun3 / config.c
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 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);
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 static void __init sun3_bootmem_alloc(unsigned long memory_start,
118                                       unsigned long memory_end)
119 {
120         unsigned long start_page;
121
122         /* align start/end to page boundaries */
123         memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK);
124         memory_end = memory_end & PAGE_MASK;
125
126         start_page = __pa(memory_start) >> PAGE_SHIFT;
127         num_pages = __pa(memory_end) >> PAGE_SHIFT;
128
129         high_memory = (void *)memory_end;
130         availmem = memory_start;
131
132         m68k_setup_node(0);
133         availmem += init_bootmem_node(NODE_DATA(0), start_page, 0, num_pages);
134         availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK;
135
136         free_bootmem(__pa(availmem), memory_end - (availmem));
137 }
138
139
140 void __init config_sun3(void)
141 {
142         unsigned long memory_start, memory_end;
143
144         printk("ARCH: SUN3\n");
145         idprom_init();
146
147         /* Subtract kernel memory from available memory */
148
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;
157
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;
161
162         m68k_num_memory=1;
163         m68k_memory[0].size=*(romvec->pv_sun3mem);
164
165         sun3_bootmem_alloc(memory_start, memory_end);
166 }
167
168 static void __init sun3_sched_init(irq_handler_t timer_routine)
169 {
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;
173         intersil_clear();
174         sun3_enable_irq(5);
175         intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE);
176         sun3_enable_interrupts();
177         intersil_clear();
178 }
179