linux/arch/sparc64/kernel/auxio.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/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ioport.h>

#include <asm/oplib.h>
#include <asm/io.h>
#include <asm/sbus.h>
#include <asm/ebus.h>
#include <asm/auxio.h>

/* This cannot be static, as it is referenced in irq.c */
void __iomem *auxio_register = NULL;

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_sbus_set(u8 bits_on, u8 bits_off)
{
	if (auxio_register) {
		unsigned char regval;
		unsigned long flags;
		unsigned char newval;

		spin_lock_irqsave(&auxio_lock, flags);

		regval =  sbus_readb(auxio_register);
		newval =  regval | bits_on;
		newval &= ~bits_off;
		newval &= ~AUXIO_AUX1_MASK;
		sbus_writeb(newval, auxio_register);
		
		spin_unlock_irqrestore(&auxio_lock, flags);
	}
}

static void __auxio_ebus_set(u8 bits_on, u8 bits_off)
{
	if (auxio_register) {
		unsigned char regval;
		unsigned long flags;
		unsigned char newval;

		spin_lock_irqsave(&auxio_lock, flags);

		regval =  (u8)readl(auxio_register);
		newval =  regval | bits_on;
		newval &= ~bits_off;
		writel((u32)newval, auxio_register);

		spin_unlock_irqrestore(&auxio_lock, flags);
	}
}

static inline void __auxio_ebus_set_led(int on)
{
	(on) ? __auxio_ebus_set(AUXIO_PCIO_LED, 0) :
		__auxio_ebus_set(0, AUXIO_PCIO_LED) ;
}

static inline void __auxio_sbus_set_led(int on)
{
	(on) ? __auxio_sbus_set(AUXIO_AUX1_LED, 0) :
		__auxio_sbus_set(0, AUXIO_AUX1_LED) ;
}

void auxio_set_led(int on)
{
	switch(auxio_devtype) {
	case AUXIO_TYPE_SBUS:
		__auxio_sbus_set_led(on);
		break;
	case AUXIO_TYPE_EBUS:
		__auxio_ebus_set_led(on);
		break;
	default:
		break;
	}
}

static inline void __auxio_sbus_set_lte(int on)
{
	(on) ? __auxio_sbus_set(AUXIO_AUX1_LTE, 0) : 
		__auxio_sbus_set(0, AUXIO_AUX1_LTE) ;
}

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;
	}
}

static void __devinit auxio_report_dev(struct device_node *dp)
{
	printk(KERN_INFO "AUXIO: Found device at %s\n",
	       dp->full_name);
}

static struct of_device_id auxio_match[] = {
	{
		.name = "auxio",
	},
	{},
};

MODULE_DEVICE_TABLE(of, auxio_match);

#ifdef CONFIG_SBUS
static int __devinit auxio_sbus_probe(struct of_device *dev, const struct of_device_id *match)
{
	struct sbus_dev *sdev = to_sbus_device(&dev->dev);

	auxio_devtype  = AUXIO_TYPE_SBUS;
	auxio_register = sbus_ioremap(&sdev->resource[0], 0,
				      sdev->reg_addrs[0].reg_size,
				      "auxiliaryIO");
	if (!auxio_register)
		return -ENODEV;

	auxio_report_dev(dev->node);
	return 0;
}

static struct of_platform_driver auxio_sbus_driver = {
	.name		= "auxio",
	.match_table	= auxio_match,
	.probe		= auxio_sbus_probe,
};
#endif

#ifdef CONFIG_PCI
static int __devinit auxio_ebus_probe(struct of_device *dev, const struct of_device_id *match)
{
	struct linux_ebus_device *edev = to_ebus_device(&dev->dev);

	auxio_devtype  = AUXIO_TYPE_EBUS;
	auxio_register = ioremap(edev->resource[0].start, sizeof(u32));
	if (!auxio_register)
		return -ENODEV;

	auxio_report_dev(dev->node);

	auxio_set_led(AUXIO_LED_ON);

	return 0;
}

static struct of_platform_driver auxio_ebus_driver = {
	.name		= "auxio",
	.match_table	= auxio_match,
	.probe		= auxio_ebus_probe,
};
#endif

static int __init auxio_probe(void)
{
#ifdef CONFIG_SBUS
	of_register_driver(&auxio_sbus_driver, &sbus_bus_type);
#endif
#ifdef CONFIG_PCI
	of_register_driver(&auxio_ebus_driver, &ebus_bus_type);
#endif

	return 0;
}

/* 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_probe);