File: /usr/src/linux/arch/sparc/kernel/auxio.c
1 /* auxio.c: Probing for the Sparc AUXIO register at boot time.
2 *
3 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
4 */
5
6 #include <linux/stddef.h>
7 #include <linux/init.h>
8 #include <linux/config.h>
9 #include <asm/oplib.h>
10 #include <asm/io.h>
11 #include <asm/auxio.h>
12 #include <asm/string.h> /* memset(), Linux has no bzero() */
13
14 /* Probe and map in the Auxiliary I/O register */
15 unsigned char *auxio_register;
16
17 void __init auxio_probe(void)
18 {
19 int node, auxio_nd;
20 struct linux_prom_registers auxregs[1];
21 struct resource r;
22
23 switch (sparc_cpu_model) {
24 case sun4d:
25 case sun4:
26 auxio_register = 0;
27 return;
28 default:
29 break;
30 }
31 node = prom_getchild(prom_root_node);
32 auxio_nd = prom_searchsiblings(node, "auxiliary-io");
33 if(!auxio_nd) {
34 node = prom_searchsiblings(node, "obio");
35 node = prom_getchild(node);
36 auxio_nd = prom_searchsiblings(node, "auxio");
37 if(!auxio_nd) {
38 #ifdef CONFIG_PCI
39 /* There may be auxio on Ebus */
40 auxio_register = 0;
41 return;
42 #else
43 if(prom_searchsiblings(node, "leds")) {
44 /* VME chassis sun4m machine, no auxio exists. */
45 auxio_register = 0;
46 return;
47 }
48 prom_printf("Cannot find auxio node, cannot continue...\n");
49 prom_halt();
50 #endif
51 }
52 }
53 prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs));
54 prom_apply_obio_ranges(auxregs, 0x1);
55 /* Map the register both read and write */
56 r.flags = auxregs[0].which_io & 0xF;
57 r.start = auxregs[0].phys_addr;
58 r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
59 auxio_register = (unsigned char *) sbus_ioremap(&r, 0,
60 auxregs[0].reg_size, "auxio");
61 /* Fix the address on sun4m and sun4c. */
62 if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
63 sparc_cpu_model == sun4c)
64 auxio_register = (unsigned char *) ((int)auxio_register | 3);
65
66 TURN_ON_LED;
67 }
68
69
70 /* sun4m power control register (AUXIO2) */
71
72 volatile unsigned char * auxio_power_register = NULL;
73
74 void __init auxio_power_probe(void)
75 {
76 struct linux_prom_registers regs;
77 int node;
78 struct resource r;
79
80 /* Attempt to find the sun4m power control node. */
81 node = prom_getchild(prom_root_node);
82 node = prom_searchsiblings(node, "obio");
83 node = prom_getchild(node);
84 node = prom_searchsiblings(node, "power");
85 if (node == 0 || node == -1)
86 return;
87
88 /* Map the power control register. */
89 prom_getproperty(node, "reg", (char *)®s, sizeof(regs));
90 prom_apply_obio_ranges(®s, 1);
91 memset(&r, 0, sizeof(r));
92 r.flags = regs.which_io & 0xF;
93 r.start = regs.phys_addr;
94 r.end = regs.phys_addr + regs.reg_size - 1;
95 auxio_power_register = (unsigned char *) sbus_ioremap(&r, 0,
96 regs.reg_size, "auxpower");
97
98 /* Display a quick message on the console. */
99 if (auxio_power_register)
100 printk(KERN_INFO "Power off control detected.\n");
101 }
102