auxio_32.c

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/* auxio.c: Probing for the Sparc AUXIO register at boot time.
 *
 * Copyright (C) 1996 David S. Miller ([email protected])
 */

#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>

/* 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 unsigned char * 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 *)&regs, sizeof(regs)) <= 0)
        return;
    prom_apply_obio_ranges(&regs, 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 *) 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");
}