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 <linux/spinlock.h>
10 #include <asm/oplib.h>
11 #include <asm/io.h>
12 #include <asm/auxio.h>
13 #include <asm/string.h> /* memset(), Linux has no bzero() */
14
15 /* Probe and map in the Auxiliary I/O register */
16
17 /* auxio_register is not static because it is referenced
18 * in entry.S::floppy_tdone
19 */
20 void __iomem *auxio_register = NULL;
21 static DEFINE_SPINLOCK(auxio_lock);
22
23 void __init auxio_probe(void)
24 {
25 int node, auxio_nd;
26 struct linux_prom_registers auxregs[1];
27 struct resource r;
28
29 switch (sparc_cpu_model) {
30 case sun4d:
31 case sun4:
32 return;
33 default:
34 break;
35 }
36 node = prom_getchild(prom_root_node);
37 auxio_nd = prom_searchsiblings(node, "auxiliary-io");
38 if(!auxio_nd) {
39 node = prom_searchsiblings(node, "obio");
40 node = prom_getchild(node);
41 auxio_nd = prom_searchsiblings(node, "auxio");
42 if(!auxio_nd) {
43 #ifdef CONFIG_PCI
44 /* There may be auxio on Ebus */
45 return;
46 #else
47 if(prom_searchsiblings(node, "leds")) {
48 /* VME chassis sun4m machine, no auxio exists. */
49 return;
50 }
51 prom_printf("Cannot find auxio node, cannot continue...\n");
52 prom_halt();
53 #endif
54 }
55 }
56 if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0)
57 return;
58 prom_apply_obio_ranges(auxregs, 0x1);
59 /* Map the register both read and write */
60 r.flags = auxregs[0].which_io & 0xF;
61 r.start = auxregs[0].phys_addr;
62 r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
63 auxio_register = sbus_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
64 /* Fix the address on sun4m and sun4c. */
65 if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
66 sparc_cpu_model == sun4c)
67 auxio_register += (3 - ((unsigned long)auxio_register & 3));
68
69 set_auxio(AUXIO_LED, 0);
70 }
71
72 unsigned char get_auxio(void)
73 {
74 if(auxio_register)
75 return sbus_readb(auxio_register);
76 return 0;
77 }
78
79 void set_auxio(unsigned char bits_on, unsigned char bits_off)
80 {
81 unsigned char regval;
82 unsigned long flags;
83 spin_lock_irqsave(&auxio_lock, flags);
84 switch(sparc_cpu_model) {
85 case sun4c:
86 regval = sbus_readb(auxio_register);
87 sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN,
88 auxio_register);
89 break;
90 case sun4m:
91 if(!auxio_register)
92 break; /* VME chassic sun4m, no auxio. */
93 regval = sbus_readb(auxio_register);
94 sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
95 auxio_register);
96 break;
97 case sun4d:
98 break;
99 default:
100 panic("Can't set AUXIO register on this machine.");
101 };
102 spin_unlock_irqrestore(&auxio_lock, flags);
103 }
104
105
106 /* sun4m power control register (AUXIO2) */
107
108 volatile unsigned char * auxio_power_register = NULL;
109
110 void __init auxio_power_probe(void)
111 {
112 struct linux_prom_registers regs;
113 int node;
114 struct resource r;
115
116 /* Attempt to find the sun4m power control node. */
117 node = prom_getchild(prom_root_node);
118 node = prom_searchsiblings(node, "obio");
119 node = prom_getchild(node);
120 node = prom_searchsiblings(node, "power");
121 if (node == 0 || node == -1)
122 return;
123
124 /* Map the power control register. */
125 if (prom_getproperty(node, "reg", (char *)®s, sizeof(regs)) <= 0)
126 return;
127 prom_apply_obio_ranges(®s, 1);
128 memset(&r, 0, sizeof(r));
129 r.flags = regs.which_io & 0xF;
130 r.start = regs.phys_addr;
131 r.end = regs.phys_addr + regs.reg_size - 1;
132 auxio_power_register = (unsigned char *) sbus_ioremap(&r, 0,
133 regs.reg_size, "auxpower");
134
135 /* Display a quick message on the console. */
136 if (auxio_power_register)
137 printk(KERN_INFO "Power off control detected.\n");
138 }
139
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