1 /* auxio.c: Probing for the Sparc AUXIO register at boot time.
3 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
6 #include <linux/stddef.h>
7 #include <linux/init.h>
8 #include <linux/spinlock.h>
11 #include <asm/auxio.h>
12 #include <asm/string.h> /* memset(), Linux has no bzero() */
14 /* Probe and map in the Auxiliary I/O register */
16 /* auxio_register is not static because it is referenced
17 * in entry.S::floppy_tdone
19 void __iomem *auxio_register = NULL;
20 static DEFINE_SPINLOCK(auxio_lock);
22 void __init auxio_probe(void)
25 struct linux_prom_registers auxregs[1];
28 switch (sparc_cpu_model) {
35 node = prom_getchild(prom_root_node);
36 auxio_nd = prom_searchsiblings(node, "auxiliary-io");
38 node = prom_searchsiblings(node, "obio");
39 node = prom_getchild(node);
40 auxio_nd = prom_searchsiblings(node, "auxio");
43 /* There may be auxio on Ebus */
46 if(prom_searchsiblings(node, "leds")) {
47 /* VME chassis sun4m machine, no auxio exists. */
50 prom_printf("Cannot find auxio node, cannot continue...\n");
55 if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0)
57 prom_apply_obio_ranges(auxregs, 0x1);
58 /* Map the register both read and write */
59 r.flags = auxregs[0].which_io & 0xF;
60 r.start = auxregs[0].phys_addr;
61 r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
62 auxio_register = sbus_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
63 /* Fix the address on sun4m and sun4c. */
64 if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
65 sparc_cpu_model == sun4c)
66 auxio_register += (3 - ((unsigned long)auxio_register & 3));
68 set_auxio(AUXIO_LED, 0);
71 unsigned char get_auxio(void)
74 return sbus_readb(auxio_register);
78 void set_auxio(unsigned char bits_on, unsigned char bits_off)
82 spin_lock_irqsave(&auxio_lock, flags);
83 switch(sparc_cpu_model) {
85 regval = sbus_readb(auxio_register);
86 sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN,
91 break; /* VME chassic sun4m, no auxio. */
92 regval = sbus_readb(auxio_register);
93 sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
99 panic("Can't set AUXIO register on this machine.");
101 spin_unlock_irqrestore(&auxio_lock, flags);
105 /* sun4m power control register (AUXIO2) */
107 volatile unsigned char * auxio_power_register = NULL;
109 void __init auxio_power_probe(void)
111 struct linux_prom_registers regs;
115 /* Attempt to find the sun4m power control node. */
116 node = prom_getchild(prom_root_node);
117 node = prom_searchsiblings(node, "obio");
118 node = prom_getchild(node);
119 node = prom_searchsiblings(node, "power");
120 if (node == 0 || node == -1)
123 /* Map the power control register. */
124 if (prom_getproperty(node, "reg", (char *)®s, sizeof(regs)) <= 0)
126 prom_apply_obio_ranges(®s, 1);
127 memset(&r, 0, sizeof(r));
128 r.flags = regs.which_io & 0xF;
129 r.start = regs.phys_addr;
130 r.end = regs.phys_addr + regs.reg_size - 1;
131 auxio_power_register = (unsigned char *) sbus_ioremap(&r, 0,
132 regs.reg_size, "auxpower");
134 /* Display a quick message on the console. */
135 if (auxio_power_register)
136 printk(KERN_INFO "Power off control detected.\n");