138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/* auxio.c: Probing for the Sparc AUXIO register at boot time.
|
|
*
|
|
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
|
|
*/
|
|
|
|
#include <linux/stddef.h>
|
|
#include <linux/init.h>
|
|
#include <linux/spinlock.h>
|
|
#include <asm/oplib.h>
|
|
#include <asm/io.h>
|
|
#include <asm/auxio.h>
|
|
#include <asm/string.h> /* memset(), Linux has no bzero() */
|
|
|
|
/* Probe and map in the Auxiliary I/O register */
|
|
|
|
/* auxio_register is not static because it is referenced
|
|
* in entry.S::floppy_tdone
|
|
*/
|
|
void __iomem *auxio_register = NULL;
|
|
static DEFINE_SPINLOCK(auxio_lock);
|
|
|
|
void __init auxio_probe(void)
|
|
{
|
|
int node, auxio_nd;
|
|
struct linux_prom_registers auxregs[1];
|
|
struct resource r;
|
|
|
|
switch (sparc_cpu_model) {
|
|
case sun4d:
|
|
case sun4:
|
|
return;
|
|
default:
|
|
break;
|
|
}
|
|
node = prom_getchild(prom_root_node);
|
|
auxio_nd = prom_searchsiblings(node, "auxiliary-io");
|
|
if(!auxio_nd) {
|
|
node = prom_searchsiblings(node, "obio");
|
|
node = prom_getchild(node);
|
|
auxio_nd = prom_searchsiblings(node, "auxio");
|
|
if(!auxio_nd) {
|
|
#ifdef CONFIG_PCI
|
|
/* There may be auxio on Ebus */
|
|
return;
|
|
#else
|
|
if(prom_searchsiblings(node, "leds")) {
|
|
/* VME chassis sun4m machine, no auxio exists. */
|
|
return;
|
|
}
|
|
prom_printf("Cannot find auxio node, cannot continue...\n");
|
|
prom_halt();
|
|
#endif
|
|
}
|
|
}
|
|
if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0)
|
|
return;
|
|
prom_apply_obio_ranges(auxregs, 0x1);
|
|
/* Map the register both read and write */
|
|
r.flags = auxregs[0].which_io & 0xF;
|
|
r.start = auxregs[0].phys_addr;
|
|
r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
|
|
auxio_register = sbus_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
|
|
/* Fix the address on sun4m and sun4c. */
|
|
if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
|
|
sparc_cpu_model == sun4c)
|
|
auxio_register += (3 - ((unsigned long)auxio_register & 3));
|
|
|
|
set_auxio(AUXIO_LED, 0);
|
|
}
|
|
|
|
unsigned char get_auxio(void)
|
|
{
|
|
if(auxio_register)
|
|
return sbus_readb(auxio_register);
|
|
return 0;
|
|
}
|
|
|
|
void set_auxio(unsigned char bits_on, unsigned char bits_off)
|
|
{
|
|
unsigned char regval;
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&auxio_lock, flags);
|
|
switch(sparc_cpu_model) {
|
|
case sun4c:
|
|
regval = sbus_readb(auxio_register);
|
|
sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN,
|
|
auxio_register);
|
|
break;
|
|
case sun4m:
|
|
if(!auxio_register)
|
|
break; /* VME chassic sun4m, no auxio. */
|
|
regval = sbus_readb(auxio_register);
|
|
sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
|
|
auxio_register);
|
|
break;
|
|
case sun4d:
|
|
break;
|
|
default:
|
|
panic("Can't set AUXIO register on this machine.");
|
|
};
|
|
spin_unlock_irqrestore(&auxio_lock, flags);
|
|
}
|
|
|
|
|
|
/* sun4m power control register (AUXIO2) */
|
|
|
|
volatile unsigned char * auxio_power_register = NULL;
|
|
|
|
void __init auxio_power_probe(void)
|
|
{
|
|
struct linux_prom_registers regs;
|
|
int node;
|
|
struct resource r;
|
|
|
|
/* Attempt to find the sun4m power control node. */
|
|
node = prom_getchild(prom_root_node);
|
|
node = prom_searchsiblings(node, "obio");
|
|
node = prom_getchild(node);
|
|
node = prom_searchsiblings(node, "power");
|
|
if (node == 0 || node == -1)
|
|
return;
|
|
|
|
/* Map the power control register. */
|
|
if (prom_getproperty(node, "reg", (char *)®s, sizeof(regs)) <= 0)
|
|
return;
|
|
prom_apply_obio_ranges(®s, 1);
|
|
memset(&r, 0, sizeof(r));
|
|
r.flags = regs.which_io & 0xF;
|
|
r.start = regs.phys_addr;
|
|
r.end = regs.phys_addr + regs.reg_size - 1;
|
|
auxio_power_register = (unsigned char *) sbus_ioremap(&r, 0,
|
|
regs.reg_size, "auxpower");
|
|
|
|
/* Display a quick message on the console. */
|
|
if (auxio_power_register)
|
|
printk(KERN_INFO "Power off control detected.\n");
|
|
}
|