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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)
*
* 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 const struct of_device_id auxio_match[] = {
{
.name = "auxio",
},
{},
};
MODULE_DEVICE_TABLE(of, auxio_match);
static int auxio_probe(struct platform_device *dev)
{
struct device_node *dp = dev->dev.of_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 platform_driver auxio_driver = {
.probe = auxio_probe,
.driver = {
.name = "auxio",
.of_match_table = auxio_match,
},
};
static int __init auxio_init(void)
{
return platform_driver_register(&auxio_driver);
}
/* 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);
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