152 lines
3.1 KiB
C
152 lines
3.1 KiB
C
/* auxio.c: Probing for the Sparc AUXIO register at boot time.
|
|
*
|
|
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
|
|
*
|
|
* Refactoring for unified NCR/PCIO support 2002 Eric Brower (ebrower@usa.net)
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/of_device.h>
|
|
|
|
#include <asm/prom.h>
|
|
#include <asm/io.h>
|
|
#include <asm/auxio.h>
|
|
|
|
void __iomem *auxio_register = NULL;
|
|
EXPORT_SYMBOL(auxio_register);
|
|
|
|
enum auxio_type {
|
|
AUXIO_TYPE_NODEV,
|
|
AUXIO_TYPE_SBUS,
|
|
AUXIO_TYPE_EBUS
|
|
};
|
|
|
|
static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV;
|
|
static DEFINE_SPINLOCK(auxio_lock);
|
|
|
|
static void __auxio_rmw(u8 bits_on, u8 bits_off, int ebus)
|
|
{
|
|
if (auxio_register) {
|
|
unsigned long flags;
|
|
u8 regval, newval;
|
|
|
|
spin_lock_irqsave(&auxio_lock, flags);
|
|
|
|
regval = (ebus ?
|
|
(u8) readl(auxio_register) :
|
|
sbus_readb(auxio_register));
|
|
newval = regval | bits_on;
|
|
newval &= ~bits_off;
|
|
if (!ebus)
|
|
newval &= ~AUXIO_AUX1_MASK;
|
|
if (ebus)
|
|
writel((u32) newval, auxio_register);
|
|
else
|
|
sbus_writeb(newval, auxio_register);
|
|
|
|
spin_unlock_irqrestore(&auxio_lock, flags);
|
|
}
|
|
}
|
|
|
|
static void __auxio_set_bit(u8 bit, int on, int ebus)
|
|
{
|
|
u8 bits_on = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED);
|
|
u8 bits_off = 0;
|
|
|
|
if (!on) {
|
|
u8 tmp = bits_off;
|
|
bits_off = bits_on;
|
|
bits_on = tmp;
|
|
}
|
|
__auxio_rmw(bits_on, bits_off, ebus);
|
|
}
|
|
|
|
void auxio_set_led(int on)
|
|
{
|
|
int ebus = auxio_devtype == AUXIO_TYPE_EBUS;
|
|
u8 bit;
|
|
|
|
bit = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED);
|
|
__auxio_set_bit(bit, on, ebus);
|
|
}
|
|
EXPORT_SYMBOL(auxio_set_led);
|
|
|
|
static void __auxio_sbus_set_lte(int on)
|
|
{
|
|
__auxio_set_bit(AUXIO_AUX1_LTE, on, 0);
|
|
}
|
|
|
|
void auxio_set_lte(int on)
|
|
{
|
|
switch(auxio_devtype) {
|
|
case AUXIO_TYPE_SBUS:
|
|
__auxio_sbus_set_lte(on);
|
|
break;
|
|
case AUXIO_TYPE_EBUS:
|
|
/* FALL-THROUGH */
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(auxio_set_lte);
|
|
|
|
static struct of_device_id __initdata auxio_match[] = {
|
|
{
|
|
.name = "auxio",
|
|
},
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, auxio_match);
|
|
|
|
static int __devinit auxio_probe(struct of_device *dev, const struct of_device_id *match)
|
|
{
|
|
struct device_node *dp = dev->node;
|
|
unsigned long size;
|
|
|
|
if (!strcmp(dp->parent->name, "ebus")) {
|
|
auxio_devtype = AUXIO_TYPE_EBUS;
|
|
size = sizeof(u32);
|
|
} else if (!strcmp(dp->parent->name, "sbus")) {
|
|
auxio_devtype = AUXIO_TYPE_SBUS;
|
|
size = 1;
|
|
} else {
|
|
printk("auxio: Unknown parent bus type [%s]\n",
|
|
dp->parent->name);
|
|
return -ENODEV;
|
|
}
|
|
auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio");
|
|
if (!auxio_register)
|
|
return -ENODEV;
|
|
|
|
printk(KERN_INFO "AUXIO: Found device at %s\n",
|
|
dp->full_name);
|
|
|
|
if (auxio_devtype == AUXIO_TYPE_EBUS)
|
|
auxio_set_led(AUXIO_LED_ON);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_platform_driver auxio_driver = {
|
|
.match_table = auxio_match,
|
|
.probe = auxio_probe,
|
|
.driver = {
|
|
.name = "auxio",
|
|
},
|
|
};
|
|
|
|
static int __init auxio_init(void)
|
|
{
|
|
return of_register_driver(&auxio_driver, &of_platform_bus_type);
|
|
}
|
|
|
|
/* Must be after subsys_initcall() so that busses are probed. Must
|
|
* be before device_initcall() because things like the floppy driver
|
|
* need to use the AUXIO register.
|
|
*/
|
|
fs_initcall(auxio_init);
|