xref: /linux/arch/sparc/kernel/auxio_32.c (revision 25aee3debe0464f6c680173041fa3de30ec9ff54)
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/spinlock.h>
9 #include <linux/of.h>
10 #include <linux/of_device.h>
11 #include <linux/export.h>
12 #include <asm/oplib.h>
13 #include <asm/io.h>
14 #include <asm/auxio.h>
15 #include <asm/string.h>		/* memset(), Linux has no bzero() */
16 #include <asm/cpu_type.h>
17 
18 /* Probe and map in the Auxiliary I/O register */
19 
20 /* auxio_register is not static because it is referenced
21  * in entry.S::floppy_tdone
22  */
23 void __iomem *auxio_register = NULL;
24 static DEFINE_SPINLOCK(auxio_lock);
25 
26 void __init auxio_probe(void)
27 {
28 	phandle node, auxio_nd;
29 	struct linux_prom_registers auxregs[1];
30 	struct resource r;
31 
32 	switch (sparc_cpu_model) {
33 	case sparc_leon:
34 	case sun4d:
35 		return;
36 	default:
37 		break;
38 	}
39 	node = prom_getchild(prom_root_node);
40 	auxio_nd = prom_searchsiblings(node, "auxiliary-io");
41 	if(!auxio_nd) {
42 		node = prom_searchsiblings(node, "obio");
43 		node = prom_getchild(node);
44 		auxio_nd = prom_searchsiblings(node, "auxio");
45 		if(!auxio_nd) {
46 #ifdef CONFIG_PCI
47 			/* There may be auxio on Ebus */
48 			return;
49 #else
50 			if(prom_searchsiblings(node, "leds")) {
51 				/* VME chassis sun4m machine, no auxio exists. */
52 				return;
53 			}
54 			prom_printf("Cannot find auxio node, cannot continue...\n");
55 			prom_halt();
56 #endif
57 		}
58 	}
59 	if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0)
60 		return;
61 	prom_apply_obio_ranges(auxregs, 0x1);
62 	/* Map the register both read and write */
63 	r.flags = auxregs[0].which_io & 0xF;
64 	r.start = auxregs[0].phys_addr;
65 	r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
66 	auxio_register = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
67 	/* Fix the address on sun4m. */
68 	if ((((unsigned long) auxregs[0].phys_addr) & 3) == 3)
69 		auxio_register += (3 - ((unsigned long)auxio_register & 3));
70 
71 	set_auxio(AUXIO_LED, 0);
72 }
73 
74 unsigned char get_auxio(void)
75 {
76 	if(auxio_register)
77 		return sbus_readb(auxio_register);
78 	return 0;
79 }
80 EXPORT_SYMBOL(get_auxio);
81 
82 void set_auxio(unsigned char bits_on, unsigned char bits_off)
83 {
84 	unsigned char regval;
85 	unsigned long flags;
86 	spin_lock_irqsave(&auxio_lock, flags);
87 	switch (sparc_cpu_model) {
88 	case sun4m:
89 		if(!auxio_register)
90 			break;     /* VME chassis sun4m, no auxio. */
91 		regval = sbus_readb(auxio_register);
92 		sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
93 			auxio_register);
94 		break;
95 	case sun4d:
96 		break;
97 	default:
98 		panic("Can't set AUXIO register on this machine.");
99 	}
100 	spin_unlock_irqrestore(&auxio_lock, flags);
101 }
102 EXPORT_SYMBOL(set_auxio);
103 
104 /* sun4m power control register (AUXIO2) */
105 
106 volatile unsigned char * auxio_power_register = NULL;
107 
108 void __init auxio_power_probe(void)
109 {
110 	struct linux_prom_registers regs;
111 	phandle node;
112 	struct resource r;
113 
114 	/* Attempt to find the sun4m power control node. */
115 	node = prom_getchild(prom_root_node);
116 	node = prom_searchsiblings(node, "obio");
117 	node = prom_getchild(node);
118 	node = prom_searchsiblings(node, "power");
119 	if (node == 0 || (s32)node == -1)
120 		return;
121 
122 	/* Map the power control register. */
123 	if (prom_getproperty(node, "reg", (char *)&regs, sizeof(regs)) <= 0)
124 		return;
125 	prom_apply_obio_ranges(&regs, 1);
126 	memset(&r, 0, sizeof(r));
127 	r.flags = regs.which_io & 0xF;
128 	r.start = regs.phys_addr;
129 	r.end = regs.phys_addr + regs.reg_size - 1;
130 	auxio_power_register = (unsigned char *) of_ioremap(&r, 0,
131 	    regs.reg_size, "auxpower");
132 
133 	/* Display a quick message on the console. */
134 	if (auxio_power_register)
135 		printk(KERN_INFO "Power off control detected.\n");
136 }
137