81257a861984306584544912f8530b1b6832fcf9
[linux-2.6.git] / arch / x86 / mach-voyager / setup.c
1 /*
2  *      Machine specific setup for generic
3  */
4
5 #include <linux/init.h>
6 #include <linux/interrupt.h>
7 #include <asm/arch_hooks.h>
8 #include <asm/voyager.h>
9 #include <asm/e820.h>
10 #include <asm/io.h>
11 #include <asm/setup.h>
12
13 void __init pre_intr_init_hook(void)
14 {
15         init_ISA_irqs();
16 }
17
18 /*
19  * IRQ2 is cascade interrupt to second interrupt controller
20  */
21 static struct irqaction irq2 = {
22         .handler = no_action,
23         .mask = CPU_MASK_NONE,
24         .name = "cascade",
25 };
26
27 void __init intr_init_hook(void)
28 {
29 #ifdef CONFIG_SMP
30         smp_intr_init();
31 #endif
32
33         setup_irq(2, &irq2);
34 }
35
36 void __init pre_setup_arch_hook(void)
37 {
38         /* Voyagers run their CPUs from independent clocks, so disable
39          * the TSC code because we can't sync them */
40         tsc_disable = 1;
41 }
42
43 void __init trap_init_hook(void)
44 {
45 }
46
47 static struct irqaction irq0 = {
48         .handler = timer_interrupt,
49         .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL,
50         .mask = CPU_MASK_NONE,
51         .name = "timer"
52 };
53
54 void __init time_init_hook(void)
55 {
56         irq0.mask = cpumask_of_cpu(safe_smp_processor_id());
57         setup_irq(0, &irq0);
58 }
59
60 /* Hook for machine specific memory setup. */
61
62 char *__init machine_specific_memory_setup(void)
63 {
64         char *who;
65
66         who = "NOT VOYAGER";
67
68         if (voyager_level == 5) {
69                 __u32 addr, length;
70                 int i;
71
72                 who = "Voyager-SUS";
73
74                 e820.nr_map = 0;
75                 for (i = 0; voyager_memory_detect(i, &addr, &length); i++) {
76                         add_memory_region(addr, length, E820_RAM);
77                 }
78                 return who;
79         } else if (voyager_level == 4) {
80                 __u32 tom;
81                 __u16 catbase = inb(VOYAGER_SSPB_RELOCATION_PORT) << 8;
82                 /* select the DINO config space */
83                 outb(VOYAGER_DINO, VOYAGER_CAT_CONFIG_PORT);
84                 /* Read DINO top of memory register */
85                 tom = ((inb(catbase + 0x4) & 0xf0) << 16)
86                     + ((inb(catbase + 0x5) & 0x7f) << 24);
87
88                 if (inb(catbase) != VOYAGER_DINO) {
89                         printk(KERN_ERR
90                                "Voyager: Failed to get DINO for L4, setting tom to EXT_MEM_K\n");
91                         tom = (boot_params.screen_info.ext_mem_k) << 10;
92                 }
93                 who = "Voyager-TOM";
94                 add_memory_region(0, 0x9f000, E820_RAM);
95                 /* map from 1M to top of memory */
96                 add_memory_region(1 * 1024 * 1024, tom - 1 * 1024 * 1024,
97                                   E820_RAM);
98                 /* FIXME: Should check the ASICs to see if I need to
99                  * take out the 8M window.  Just do it at the moment
100                  * */
101                 add_memory_region(8 * 1024 * 1024, 8 * 1024 * 1024,
102                                   E820_RESERVED);
103                 return who;
104         }
105
106         who = "BIOS-e820";
107
108         /*
109          * Try to copy the BIOS-supplied E820-map.
110          *
111          * Otherwise fake a memory map; one section from 0k->640k,
112          * the next section from 1mb->appropriate_mem_k
113          */
114         sanitize_e820_map(boot_params.e820_map, &boot_params.e820_entries);
115         if (copy_e820_map(boot_params.e820_map, boot_params.e820_entries)
116             < 0) {
117                 unsigned long mem_size;
118
119                 /* compare results from other methods and take the greater */
120                 if (boot_params.alt_mem_k < boot_params.screen_info.ext_mem_k) {
121                         mem_size = boot_params.screen_info.ext_mem_k;
122                         who = "BIOS-88";
123                 } else {
124                         mem_size = boot_params.alt_mem_k;
125                         who = "BIOS-e801";
126                 }
127
128                 e820.nr_map = 0;
129                 add_memory_region(0, LOWMEMSIZE(), E820_RAM);
130                 add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
131         }
132         return who;
133 }