xref: /openbmc/linux/arch/sparc/kernel/auxio_32.c (revision 4800cd83)
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 <asm/oplib.h>
12 #include <asm/io.h>
13 #include <asm/auxio.h>
14 #include <asm/string.h>		/* memset(), Linux has no bzero() */
15 
16 /* Probe and map in the Auxiliary I/O register */
17 
18 /* auxio_register is not static because it is referenced
19  * in entry.S::floppy_tdone
20  */
21 void __iomem *auxio_register = NULL;
22 static DEFINE_SPINLOCK(auxio_lock);
23 
24 void __init auxio_probe(void)
25 {
26 	phandle node, auxio_nd;
27 	struct linux_prom_registers auxregs[1];
28 	struct resource r;
29 
30 	switch (sparc_cpu_model) {
31 	case sparc_leon:
32 	case sun4d:
33 	case sun4:
34 		return;
35 	default:
36 		break;
37 	}
38 	node = prom_getchild(prom_root_node);
39 	auxio_nd = prom_searchsiblings(node, "auxiliary-io");
40 	if(!auxio_nd) {
41 		node = prom_searchsiblings(node, "obio");
42 		node = prom_getchild(node);
43 		auxio_nd = prom_searchsiblings(node, "auxio");
44 		if(!auxio_nd) {
45 #ifdef CONFIG_PCI
46 			/* There may be auxio on Ebus */
47 			return;
48 #else
49 			if(prom_searchsiblings(node, "leds")) {
50 				/* VME chassis sun4m machine, no auxio exists. */
51 				return;
52 			}
53 			prom_printf("Cannot find auxio node, cannot continue...\n");
54 			prom_halt();
55 #endif
56 		}
57 	}
58 	if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0)
59 		return;
60 	prom_apply_obio_ranges(auxregs, 0x1);
61 	/* Map the register both read and write */
62 	r.flags = auxregs[0].which_io & 0xF;
63 	r.start = auxregs[0].phys_addr;
64 	r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
65 	auxio_register = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
66 	/* Fix the address on sun4m and sun4c. */
67 	if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
68 	   sparc_cpu_model == sun4c)
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 sun4c:
89 		regval = sbus_readb(auxio_register);
90 		sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN,
91 			auxio_register);
92 		break;
93 	case sun4m:
94 		if(!auxio_register)
95 			break;     /* VME chassis sun4m, no auxio. */
96 		regval = sbus_readb(auxio_register);
97 		sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
98 			auxio_register);
99 		break;
100 	case sun4d:
101 		break;
102 	default:
103 		panic("Can't set AUXIO register on this machine.");
104 	};
105 	spin_unlock_irqrestore(&auxio_lock, flags);
106 }
107 EXPORT_SYMBOL(set_auxio);
108 
109 /* sun4m power control register (AUXIO2) */
110 
111 volatile unsigned char * auxio_power_register = NULL;
112 
113 void __init auxio_power_probe(void)
114 {
115 	struct linux_prom_registers regs;
116 	phandle node;
117 	struct resource r;
118 
119 	/* Attempt to find the sun4m power control node. */
120 	node = prom_getchild(prom_root_node);
121 	node = prom_searchsiblings(node, "obio");
122 	node = prom_getchild(node);
123 	node = prom_searchsiblings(node, "power");
124 	if (node == 0 || (s32)node == -1)
125 		return;
126 
127 	/* Map the power control register. */
128 	if (prom_getproperty(node, "reg", (char *)&regs, sizeof(regs)) <= 0)
129 		return;
130 	prom_apply_obio_ranges(&regs, 1);
131 	memset(&r, 0, sizeof(r));
132 	r.flags = regs.which_io & 0xF;
133 	r.start = regs.phys_addr;
134 	r.end = regs.phys_addr + regs.reg_size - 1;
135 	auxio_power_register = (unsigned char *) of_ioremap(&r, 0,
136 	    regs.reg_size, "auxpower");
137 
138 	/* Display a quick message on the console. */
139 	if (auxio_power_register)
140 		printk(KERN_INFO "Power off control detected.\n");
141 }
142