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// SPDX-License-Identifier: GPL-2.0
/* 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 <linux/of.h>
#include <linux/of_device.h>
#include <linux/export.h>
#include <asm/oplib.h>
#include <asm/io.h>
#include <asm/auxio.h>
#include <asm/string.h> /* memset(), Linux has no bzero() */
#include <asm/cpu_type.h>
#include "kernel.h"
/* 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)
{
phandle node, auxio_nd;
struct linux_prom_registers auxregs[1];
struct resource r;
switch (sparc_cpu_model) {
case sparc_leon:
case sun4d:
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 = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
/* Fix the address on sun4m. */
if ((((unsigned long) auxregs[0].phys_addr) & 3) == 3)
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;
}
EXPORT_SYMBOL(get_auxio);
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 sun4m:
if(!auxio_register)
break; /* VME chassis 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);
}
EXPORT_SYMBOL(set_auxio);
/* sun4m power control register (AUXIO2) */
volatile u8 __iomem *auxio_power_register = NULL;
void __init auxio_power_probe(void)
{
struct linux_prom_registers regs;
phandle 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 || (s32)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 =
(u8 __iomem *)of_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");
}
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