drivers/mfd/asic3.c - kernel/msm-4.9 - Gitiles

 /*
  * driver/mfd/asic3.c
  *
  * Compaq ASIC3 support.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * Copyright 2001 Compaq Computer Corporation.
  * Copyright 2004-2005 Phil Blundell
  * Copyright 2007 OpenedHand Ltd.
  *
  * Authors: Phil Blundell <pb@handhelds.org>,
  *	    Samuel Ortiz <sameo@openedhand.com>
  *
  */

 #include <linux/version.h>
 #include <linux/kernel.h>
 #include <linux/irq.h>
 #include <linux/io.h>
 #include <linux/spinlock.h>
 #include <linux/platform_device.h>

 #include <linux/mfd/asic3.h>

 static inline void asic3_write_register(struct asic3 *asic,
 				 unsigned int reg, u32 value)
 {
 	iowrite16(value, asic->mapping +
 		  (reg >> asic->bus_shift));
 }

 static inline u32 asic3_read_register(struct asic3 *asic,
 			       unsigned int reg)
 {
 	return ioread16(asic->mapping +
 			(reg >> asic->bus_shift));
 }

 /* IRQs */
 #define MAX_ASIC_ISR_LOOPS    20
 #define ASIC3_GPIO_Base_INCR \
 	(ASIC3_GPIO_B_Base - ASIC3_GPIO_A_Base)

 static void asic3_irq_flip_edge(struct asic3 *asic,
 				u32 base, int bit)
 {
 	u16 edge;
 	unsigned long flags;

 	spin_lock_irqsave(&asic->lock, flags);
 	edge = asic3_read_register(asic,
 				   base + ASIC3_GPIO_EdgeTrigger);
 	edge ^= bit;
 	asic3_write_register(asic,
 			     base + ASIC3_GPIO_EdgeTrigger, edge);
 	spin_unlock_irqrestore(&asic->lock, flags);
 }

 static void asic3_irq_demux(unsigned int irq, struct irq_desc *desc)
 {
 	int iter, i;
 	unsigned long flags;
 	struct asic3 *asic;

 	desc->chip->ack(irq);

 	asic = desc->handler_data;

 	for (iter = 0 ; iter < MAX_ASIC_ISR_LOOPS; iter++) {
 		u32 status;
 		int bank;

 		spin_lock_irqsave(&asic->lock, flags);
 		status = asic3_read_register(asic,
 					     ASIC3_OFFSET(INTR, PIntStat));
 		spin_unlock_irqrestore(&asic->lock, flags);

 		/* Check all ten register bits */
 		if ((status & 0x3ff) == 0)
 			break;

 		/* Handle GPIO IRQs */
 		for (bank = 0; bank < ASIC3_NUM_GPIO_BANKS; bank++) {
 			if (status & (1 << bank)) {
 				unsigned long base, istat;

 				base = ASIC3_GPIO_A_Base
 				       + bank * ASIC3_GPIO_Base_INCR;

 				spin_lock_irqsave(&asic->lock, flags);
 				istat = asic3_read_register(asic,
 							    base +
 							    ASIC3_GPIO_IntStatus);
 				/* Clearing IntStatus */
 				asic3_write_register(asic,
 						     base +
 						     ASIC3_GPIO_IntStatus, 0);
 				spin_unlock_irqrestore(&asic->lock, flags);

 				for (i = 0; i < ASIC3_GPIOS_PER_BANK; i++) {
 					int bit = (1 << i);
 					unsigned int irqnr;

 					if (!(istat & bit))
 						continue;

 					irqnr = asic->irq_base +
 						(ASIC3_GPIOS_PER_BANK * bank)
 						+ i;
 					desc = irq_desc + irqnr;
 					desc->handle_irq(irqnr, desc);
 					if (asic->irq_bothedge[bank] & bit)
 						asic3_irq_flip_edge(asic, base,
 								    bit);
 				}
 			}
 		}

 		/* Handle remaining IRQs in the status register */
 		for (i = ASIC3_NUM_GPIOS; i < ASIC3_NR_IRQS; i++) {
 			/* They start at bit 4 and go up */
 			if (status & (1 << (i - ASIC3_NUM_GPIOS + 4))) {
 				desc = irq_desc +  + i;
 				desc->handle_irq(asic->irq_base + i,
 						 desc);
 			}
 		}
 	}

 	if (iter >= MAX_ASIC_ISR_LOOPS)
 		printk(KERN_ERR "%s: interrupt processing overrun\n",
 		       __func__);
 }

 static inline int asic3_irq_to_bank(struct asic3 *asic, int irq)
 {
 	int n;

 	n = (irq - asic->irq_base) >> 4;

 	return (n * (ASIC3_GPIO_B_Base - ASIC3_GPIO_A_Base));
 }

 static inline int asic3_irq_to_index(struct asic3 *asic, int irq)
 {
 	return (irq - asic->irq_base) & 0xf;
 }

 static void asic3_mask_gpio_irq(unsigned int irq)
 {
 	struct asic3 *asic = get_irq_chip_data(irq);
 	u32 val, bank, index;
 	unsigned long flags;

 	bank = asic3_irq_to_bank(asic, irq);
 	index = asic3_irq_to_index(asic, irq);

 	spin_lock_irqsave(&asic->lock, flags);
 	val = asic3_read_register(asic, bank + ASIC3_GPIO_Mask);
 	val |= 1 << index;
 	asic3_write_register(asic, bank + ASIC3_GPIO_Mask, val);
 	spin_unlock_irqrestore(&asic->lock, flags);
 }

 static void asic3_mask_irq(unsigned int irq)
 {
 	struct asic3 *asic = get_irq_chip_data(irq);
 	int regval;
 	unsigned long flags;

 	spin_lock_irqsave(&asic->lock, flags);
 	regval = asic3_read_register(asic,
 				     ASIC3_INTR_Base +
 				     ASIC3_INTR_IntMask);

 	regval &= ~(ASIC3_INTMASK_MASK0 <<
 		    (irq - (asic->irq_base + ASIC3_NUM_GPIOS)));

 	asic3_write_register(asic,
 			     ASIC3_INTR_Base +
 			     ASIC3_INTR_IntMask,
 			     regval);
 	spin_unlock_irqrestore(&asic->lock, flags);
 }

 static void asic3_unmask_gpio_irq(unsigned int irq)
 {
 	struct asic3 *asic = get_irq_chip_data(irq);
 	u32 val, bank, index;
 	unsigned long flags;

 	bank = asic3_irq_to_bank(asic, irq);
 	index = asic3_irq_to_index(asic, irq);

 	spin_lock_irqsave(&asic->lock, flags);
 	val = asic3_read_register(asic, bank + ASIC3_GPIO_Mask);
 	val &= ~(1 << index);
 	asic3_write_register(asic, bank + ASIC3_GPIO_Mask, val);
 	spin_unlock_irqrestore(&asic->lock, flags);
 }

 static void asic3_unmask_irq(unsigned int irq)
 {
 	struct asic3 *asic = get_irq_chip_data(irq);
 	int regval;
 	unsigned long flags;

 	spin_lock_irqsave(&asic->lock, flags);
 	regval = asic3_read_register(asic,
 				     ASIC3_INTR_Base +
 				     ASIC3_INTR_IntMask);

 	regval |= (ASIC3_INTMASK_MASK0 <<
 		   (irq - (asic->irq_base + ASIC3_NUM_GPIOS)));

 	asic3_write_register(asic,
 			     ASIC3_INTR_Base +
 			     ASIC3_INTR_IntMask,
 			     regval);
 	spin_unlock_irqrestore(&asic->lock, flags);
 }

 static int asic3_gpio_irq_type(unsigned int irq, unsigned int type)
 {
 	struct asic3 *asic = get_irq_chip_data(irq);
 	u32 bank, index;
 	u16 trigger, level, edge, bit;
 	unsigned long flags;

 	bank = asic3_irq_to_bank(asic, irq);
 	index = asic3_irq_to_index(asic, irq);
 	bit = 1<<index;

 	spin_lock_irqsave(&asic->lock, flags);
 	level = asic3_read_register(asic,
 				    bank + ASIC3_GPIO_LevelTrigger);
 	edge = asic3_read_register(asic,
 				   bank + ASIC3_GPIO_EdgeTrigger);
 	trigger = asic3_read_register(asic,
 				      bank + ASIC3_GPIO_TriggerType);
 	asic->irq_bothedge[(irq - asic->irq_base) >> 4] &= ~bit;

 	if (type == IRQT_RISING) {
 		trigger |= bit;
 		edge |= bit;
 	} else if (type == IRQT_FALLING) {
 		trigger |= bit;
 		edge &= ~bit;
 	} else if (type == IRQT_BOTHEDGE) {
 		trigger |= bit;
 		if (asic3_gpio_get_value(asic, irq - asic->irq_base))
 			edge &= ~bit;
 		else
 			edge |= bit;
 		asic->irq_bothedge[(irq - asic->irq_base) >> 4] |= bit;
 	} else if (type == IRQT_LOW) {
 		trigger &= ~bit;
 		level &= ~bit;
 	} else if (type == IRQT_HIGH) {
 		trigger &= ~bit;
 		level |= bit;
 	} else {
 		/*
 		 * if type == IRQT_NOEDGE, we should mask interrupts, but
 		 * be careful to not unmask them if mask was also called.
 		 * Probably need internal state for mask.
 		 */
 		printk(KERN_NOTICE "asic3: irq type not changed.\n");
 	}
 	asic3_write_register(asic, bank + ASIC3_GPIO_LevelTrigger,
 			     level);
 	asic3_write_register(asic, bank + ASIC3_GPIO_EdgeTrigger,
 			     edge);
 	asic3_write_register(asic, bank + ASIC3_GPIO_TriggerType,
 			     trigger);
 	spin_unlock_irqrestore(&asic->lock, flags);
 	return 0;
 }

 static struct irq_chip asic3_gpio_irq_chip = {
 	.name		= "ASIC3-GPIO",
 	.ack		= asic3_mask_gpio_irq,
 	.mask		= asic3_mask_gpio_irq,
 	.unmask		= asic3_unmask_gpio_irq,
 	.set_type	= asic3_gpio_irq_type,
 };

 static struct irq_chip asic3_irq_chip = {
 	.name		= "ASIC3",
 	.ack		= asic3_mask_irq,
 	.mask		= asic3_mask_irq,
 	.unmask		= asic3_unmask_irq,
 };

 static int asic3_irq_probe(struct platform_device *pdev)
 {
 	struct asic3 *asic = platform_get_drvdata(pdev);
 	unsigned long clksel = 0;
 	unsigned int irq, irq_base;

 	asic->irq_nr = platform_get_irq(pdev, 0);
 	if (asic->irq_nr < 0)
 		return asic->irq_nr;

 	/* turn on clock to IRQ controller */
 	clksel |= CLOCK_SEL_CX;
 	asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL),
 			     clksel);

 	irq_base = asic->irq_base;

 	for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
 		if (irq < asic->irq_base + ASIC3_NUM_GPIOS)
 			set_irq_chip(irq, &asic3_gpio_irq_chip);
 		else
 			set_irq_chip(irq, &asic3_irq_chip);

 		set_irq_chip_data(irq, asic);
 		set_irq_handler(irq, handle_level_irq);
 		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 	}

 	asic3_write_register(asic, ASIC3_OFFSET(INTR, IntMask),
 			     ASIC3_INTMASK_GINTMASK);

 	set_irq_chained_handler(asic->irq_nr, asic3_irq_demux);
 	set_irq_type(asic->irq_nr, IRQT_RISING);
 	set_irq_data(asic->irq_nr, asic);

 	return 0;
 }

 static void asic3_irq_remove(struct platform_device *pdev)
 {
 	struct asic3 *asic = platform_get_drvdata(pdev);
 	unsigned int irq, irq_base;

 	irq_base = asic->irq_base;

 	for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
 		set_irq_flags(irq, 0);
 		set_irq_handler(irq, NULL);
 		set_irq_chip(irq, NULL);
 		set_irq_chip_data(irq, NULL);
 	}
 	set_irq_chained_handler(asic->irq_nr, NULL);
 }

 /* GPIOs */
 static inline u32 asic3_get_gpio(struct asic3 *asic, unsigned int base,
 				 unsigned int function)
 {
 	return asic3_read_register(asic, base + function);
 }

 static void asic3_set_gpio(struct asic3 *asic, unsigned int base,
 			   unsigned int function, u32 bits, u32 val)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&asic->lock, flags);
 	val |= (asic3_read_register(asic, base + function) & ~bits);

 	asic3_write_register(asic, base + function, val);
 	spin_unlock_irqrestore(&asic->lock, flags);
 }

 #define asic3_get_gpio_a(asic, fn) \
 	asic3_get_gpio(asic, ASIC3_GPIO_A_Base, ASIC3_GPIO_##fn)
 #define asic3_get_gpio_b(asic, fn) \
 	asic3_get_gpio(asic, ASIC3_GPIO_B_Base, ASIC3_GPIO_##fn)
 #define asic3_get_gpio_c(asic, fn) \
 	asic3_get_gpio(asic, ASIC3_GPIO_C_Base, ASIC3_GPIO_##fn)
 #define asic3_get_gpio_d(asic, fn) \
 	asic3_get_gpio(asic, ASIC3_GPIO_D_Base, ASIC3_GPIO_##fn)

 #define asic3_set_gpio_a(asic, fn, bits, val) \
 	asic3_set_gpio(asic, ASIC3_GPIO_A_Base, ASIC3_GPIO_##fn, bits, val)
 #define asic3_set_gpio_b(asic, fn, bits, val) \
 	asic3_set_gpio(asic, ASIC3_GPIO_B_Base, ASIC3_GPIO_##fn, bits, val)
 #define asic3_set_gpio_c(asic, fn, bits, val) \
 	asic3_set_gpio(asic, ASIC3_GPIO_C_Base, ASIC3_GPIO_##fn, bits, val)
 #define asic3_set_gpio_d(asic, fn, bits, val) \
 	asic3_set_gpio(asic, ASIC3_GPIO_D_Base, ASIC3_GPIO_##fn, bits, val)

 #define asic3_set_gpio_banks(asic, fn, bits, pdata, field) 		  \
 	do {								  \
 	     asic3_set_gpio_a((asic), fn, (bits), (pdata)->gpio_a.field); \
 	     asic3_set_gpio_b((asic), fn, (bits), (pdata)->gpio_b.field); \
 	     asic3_set_gpio_c((asic), fn, (bits), (pdata)->gpio_c.field); \
 	     asic3_set_gpio_d((asic), fn, (bits), (pdata)->gpio_d.field); \
 	} while (0)

 int asic3_gpio_get_value(struct asic3 *asic, unsigned gpio)
 {
 	u32 mask = ASIC3_GPIO_bit(gpio);

 	switch (gpio >> 4) {
 	case ASIC3_GPIO_BANK_A:
 		return asic3_get_gpio_a(asic, Status) & mask;
 	case ASIC3_GPIO_BANK_B:
 		return asic3_get_gpio_b(asic, Status) & mask;
 	case ASIC3_GPIO_BANK_C:
 		return asic3_get_gpio_c(asic, Status) & mask;
 	case ASIC3_GPIO_BANK_D:
 		return asic3_get_gpio_d(asic, Status) & mask;
 	default:
 		printk(KERN_ERR "%s: invalid GPIO value 0x%x",
 		       __func__, gpio);
 		return -EINVAL;
 	}
 }
 EXPORT_SYMBOL(asic3_gpio_get_value);

 void asic3_gpio_set_value(struct asic3 *asic, unsigned gpio, int val)
 {
 	u32 mask = ASIC3_GPIO_bit(gpio);
 	u32 bitval = 0;
 	if (val)
 		bitval = mask;

 	switch (gpio >> 4) {
 	case ASIC3_GPIO_BANK_A:
 		asic3_set_gpio_a(asic, Out, mask, bitval);
 		return;
 	case ASIC3_GPIO_BANK_B:
 		asic3_set_gpio_b(asic, Out, mask, bitval);
 		return;
 	case ASIC3_GPIO_BANK_C:
 		asic3_set_gpio_c(asic, Out, mask, bitval);
 		return;
 	case ASIC3_GPIO_BANK_D:
 		asic3_set_gpio_d(asic, Out, mask, bitval);
 		return;
 	default:
 		printk(KERN_ERR "%s: invalid GPIO value 0x%x",
 		       __func__, gpio);
 		return;
 	}
 }
 EXPORT_SYMBOL(asic3_gpio_set_value);

 static int asic3_gpio_probe(struct platform_device *pdev)
 {
 	struct asic3_platform_data *pdata = pdev->dev.platform_data;
 	struct asic3 *asic = platform_get_drvdata(pdev);

 	asic3_write_register(asic, ASIC3_GPIO_OFFSET(A, Mask), 0xffff);
 	asic3_write_register(asic, ASIC3_GPIO_OFFSET(B, Mask), 0xffff);
 	asic3_write_register(asic, ASIC3_GPIO_OFFSET(C, Mask), 0xffff);
 	asic3_write_register(asic, ASIC3_GPIO_OFFSET(D, Mask), 0xffff);

 	asic3_set_gpio_a(asic, SleepMask, 0xffff, 0xffff);
 	asic3_set_gpio_b(asic, SleepMask, 0xffff, 0xffff);
 	asic3_set_gpio_c(asic, SleepMask, 0xffff, 0xffff);
 	asic3_set_gpio_d(asic, SleepMask, 0xffff, 0xffff);

 	if (pdata) {
 		asic3_set_gpio_banks(asic, Out, 0xffff, pdata, init);
 		asic3_set_gpio_banks(asic, Direction, 0xffff, pdata, dir);
 		asic3_set_gpio_banks(asic, SleepMask, 0xffff, pdata,
 				     sleep_mask);
 		asic3_set_gpio_banks(asic, SleepOut, 0xffff, pdata, sleep_out);
 		asic3_set_gpio_banks(asic, BattFaultOut, 0xffff, pdata,
 				     batt_fault_out);
 		asic3_set_gpio_banks(asic, SleepConf, 0xffff, pdata,
 				     sleep_conf);
 		asic3_set_gpio_banks(asic, AltFunction, 0xffff, pdata,
 				     alt_function);
 	}

 	return 0;
 }

 static void asic3_gpio_remove(struct platform_device *pdev)
 {
 	return;
 }


 /* Core */
 static int asic3_probe(struct platform_device *pdev)
 {
 	struct asic3_platform_data *pdata = pdev->dev.platform_data;
 	struct asic3 *asic;
 	struct resource *mem;
 	unsigned long clksel;
 	int ret;

 	asic = kzalloc(sizeof(struct asic3), GFP_KERNEL);
 	if (!asic)
 		return -ENOMEM;

 	spin_lock_init(&asic->lock);
 	platform_set_drvdata(pdev, asic);
 	asic->dev = &pdev->dev;

 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mem) {
 		ret = -ENOMEM;
 		printk(KERN_ERR "asic3: no MEM resource\n");
 		goto err_out_1;
 	}

 	asic->mapping = ioremap(mem->start, PAGE_SIZE);
 	if (!asic->mapping) {
 		ret = -ENOMEM;
 		printk(KERN_ERR "asic3: couldn't ioremap\n");
 		goto err_out_1;
 	}

 	asic->irq_base = pdata->irq_base;

 	if (pdata && pdata->bus_shift)
 		asic->bus_shift = 2 - pdata->bus_shift;
 	else
 		asic->bus_shift = 0;

 	clksel = 0;
 	asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel);

 	ret = asic3_irq_probe(pdev);
 	if (ret < 0) {
 		printk(KERN_ERR "asic3: couldn't probe IRQs\n");
 		goto err_out_2;
 	}
 	asic3_gpio_probe(pdev);

 	if (pdata->children) {
 		int i;
 		for (i = 0; i < pdata->n_children; i++) {
 			pdata->children[i]->dev.parent = &pdev->dev;
 			platform_device_register(pdata->children[i]);
 		}
 	}

 	printk(KERN_INFO "ASIC3 Core driver\n");

 	return 0;

  err_out_2:
 	iounmap(asic->mapping);
  err_out_1:
 	kfree(asic);

 	return ret;
 }

 static int asic3_remove(struct platform_device *pdev)
 {
 	struct asic3 *asic = platform_get_drvdata(pdev);

 	asic3_gpio_remove(pdev);
 	asic3_irq_remove(pdev);

 	asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), 0);

 	iounmap(asic->mapping);

 	kfree(asic);

 	return 0;
 }

 static void asic3_shutdown(struct platform_device *pdev)
 {
 }

 static struct platform_driver asic3_device_driver = {
 	.driver		= {
 		.name	= "asic3",
 	},
 	.probe		= asic3_probe,
 	.remove		= __devexit_p(asic3_remove),
 	.shutdown	= asic3_shutdown,
 };

 static int __init asic3_init(void)
 {
 	int retval = 0;
 	retval = platform_driver_register(&asic3_device_driver);
 	return retval;
 }

 subsys_initcall(asic3_init);
	/*
	* driver/mfd/asic3.c
	*
	* Compaq ASIC3 support.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* Copyright 2001 Compaq Computer Corporation.
	* Copyright 2004-2005 Phil Blundell
	* Copyright 2007 OpenedHand Ltd.
	*
	* Authors: Phil Blundell <pb@handhelds.org>,
	* Samuel Ortiz <sameo@openedhand.com>
	*
	*/

	#include <linux/version.h>
	#include <linux/kernel.h>
	#include <linux/irq.h>
	#include <linux/io.h>
	#include <linux/spinlock.h>
	#include <linux/platform_device.h>

	#include <linux/mfd/asic3.h>

	static inline void asic3_write_register(struct asic3 *asic,
	unsigned int reg, u32 value)
	{
	iowrite16(value, asic->mapping +
	(reg >> asic->bus_shift));
	}

	static inline u32 asic3_read_register(struct asic3 *asic,
	unsigned int reg)
	{
	return ioread16(asic->mapping +
	(reg >> asic->bus_shift));
	}

	/* IRQs */
	#define MAX_ASIC_ISR_LOOPS 20
	#define ASIC3_GPIO_Base_INCR \
	(ASIC3_GPIO_B_Base - ASIC3_GPIO_A_Base)

	static void asic3_irq_flip_edge(struct asic3 *asic,
	u32 base, int bit)
	{
	u16 edge;
	unsigned long flags;

	spin_lock_irqsave(&asic->lock, flags);
	edge = asic3_read_register(asic,
	base + ASIC3_GPIO_EdgeTrigger);
	edge ^= bit;
	asic3_write_register(asic,
	base + ASIC3_GPIO_EdgeTrigger, edge);
	spin_unlock_irqrestore(&asic->lock, flags);
	}

	static void asic3_irq_demux(unsigned int irq, struct irq_desc *desc)
	{
	int iter, i;
	unsigned long flags;
	struct asic3 *asic;

	desc->chip->ack(irq);

	asic = desc->handler_data;

	for (iter = 0 ; iter < MAX_ASIC_ISR_LOOPS; iter++) {
	u32 status;
	int bank;

	spin_lock_irqsave(&asic->lock, flags);
	status = asic3_read_register(asic,
	ASIC3_OFFSET(INTR, PIntStat));
	spin_unlock_irqrestore(&asic->lock, flags);

	/* Check all ten register bits */
	if ((status & 0x3ff) == 0)
	break;

	/* Handle GPIO IRQs */
	for (bank = 0; bank < ASIC3_NUM_GPIO_BANKS; bank++) {
	if (status & (1 << bank)) {
	unsigned long base, istat;

	base = ASIC3_GPIO_A_Base
	+ bank * ASIC3_GPIO_Base_INCR;

	spin_lock_irqsave(&asic->lock, flags);
	istat = asic3_read_register(asic,
	base +
	ASIC3_GPIO_IntStatus);
	/* Clearing IntStatus */
	asic3_write_register(asic,
	base +
	ASIC3_GPIO_IntStatus, 0);
	spin_unlock_irqrestore(&asic->lock, flags);

	for (i = 0; i < ASIC3_GPIOS_PER_BANK; i++) {
	int bit = (1 << i);
	unsigned int irqnr;

	if (!(istat & bit))
	continue;

	irqnr = asic->irq_base +
	(ASIC3_GPIOS_PER_BANK * bank)
	+ i;
	desc = irq_desc + irqnr;
	desc->handle_irq(irqnr, desc);
	if (asic->irq_bothedge[bank] & bit)
	asic3_irq_flip_edge(asic, base,
	bit);
	}
	}
	}

	/* Handle remaining IRQs in the status register */
	for (i = ASIC3_NUM_GPIOS; i < ASIC3_NR_IRQS; i++) {
	/* They start at bit 4 and go up */
	if (status & (1 << (i - ASIC3_NUM_GPIOS + 4))) {
	desc = irq_desc + + i;
	desc->handle_irq(asic->irq_base + i,
	desc);
	}
	}
	}

	if (iter >= MAX_ASIC_ISR_LOOPS)
	printk(KERN_ERR "%s: interrupt processing overrun\n",
	__func__);
	}

	static inline int asic3_irq_to_bank(struct asic3 *asic, int irq)
	{
	int n;

	n = (irq - asic->irq_base) >> 4;

	return (n * (ASIC3_GPIO_B_Base - ASIC3_GPIO_A_Base));
	}

	static inline int asic3_irq_to_index(struct asic3 *asic, int irq)
	{
	return (irq - asic->irq_base) & 0xf;
	}

	static void asic3_mask_gpio_irq(unsigned int irq)
	{
	struct asic3 *asic = get_irq_chip_data(irq);
	u32 val, bank, index;
	unsigned long flags;

	bank = asic3_irq_to_bank(asic, irq);
	index = asic3_irq_to_index(asic, irq);

	spin_lock_irqsave(&asic->lock, flags);
	val = asic3_read_register(asic, bank + ASIC3_GPIO_Mask);
	val \|= 1 << index;
	asic3_write_register(asic, bank + ASIC3_GPIO_Mask, val);
	spin_unlock_irqrestore(&asic->lock, flags);
	}

	static void asic3_mask_irq(unsigned int irq)
	{
	struct asic3 *asic = get_irq_chip_data(irq);
	int regval;
	unsigned long flags;

	spin_lock_irqsave(&asic->lock, flags);
	regval = asic3_read_register(asic,
	ASIC3_INTR_Base +
	ASIC3_INTR_IntMask);

	regval &= ~(ASIC3_INTMASK_MASK0 <<
	(irq - (asic->irq_base + ASIC3_NUM_GPIOS)));

	asic3_write_register(asic,
	ASIC3_INTR_Base +
	ASIC3_INTR_IntMask,
	regval);
	spin_unlock_irqrestore(&asic->lock, flags);
	}

	static void asic3_unmask_gpio_irq(unsigned int irq)
	{
	struct asic3 *asic = get_irq_chip_data(irq);
	u32 val, bank, index;
	unsigned long flags;

	bank = asic3_irq_to_bank(asic, irq);
	index = asic3_irq_to_index(asic, irq);

	spin_lock_irqsave(&asic->lock, flags);
	val = asic3_read_register(asic, bank + ASIC3_GPIO_Mask);
	val &= ~(1 << index);
	asic3_write_register(asic, bank + ASIC3_GPIO_Mask, val);
	spin_unlock_irqrestore(&asic->lock, flags);
	}

	static void asic3_unmask_irq(unsigned int irq)
	{
	struct asic3 *asic = get_irq_chip_data(irq);
	int regval;
	unsigned long flags;

	spin_lock_irqsave(&asic->lock, flags);
	regval = asic3_read_register(asic,
	ASIC3_INTR_Base +
	ASIC3_INTR_IntMask);

	regval \|= (ASIC3_INTMASK_MASK0 <<
	(irq - (asic->irq_base + ASIC3_NUM_GPIOS)));

	asic3_write_register(asic,
	ASIC3_INTR_Base +
	ASIC3_INTR_IntMask,
	regval);
	spin_unlock_irqrestore(&asic->lock, flags);
	}

	static int asic3_gpio_irq_type(unsigned int irq, unsigned int type)
	{
	struct asic3 *asic = get_irq_chip_data(irq);
	u32 bank, index;
	u16 trigger, level, edge, bit;
	unsigned long flags;

	bank = asic3_irq_to_bank(asic, irq);
	index = asic3_irq_to_index(asic, irq);
	bit = 1<<index;

	spin_lock_irqsave(&asic->lock, flags);
	level = asic3_read_register(asic,
	bank + ASIC3_GPIO_LevelTrigger);
	edge = asic3_read_register(asic,
	bank + ASIC3_GPIO_EdgeTrigger);
	trigger = asic3_read_register(asic,
	bank + ASIC3_GPIO_TriggerType);
	asic->irq_bothedge[(irq - asic->irq_base) >> 4] &= ~bit;

	if (type == IRQT_RISING) {
	trigger \|= bit;
	edge \|= bit;
	} else if (type == IRQT_FALLING) {
	trigger \|= bit;
	edge &= ~bit;
	} else if (type == IRQT_BOTHEDGE) {
	trigger \|= bit;
	if (asic3_gpio_get_value(asic, irq - asic->irq_base))
	edge &= ~bit;
	else
	edge \|= bit;
	asic->irq_bothedge[(irq - asic->irq_base) >> 4] \|= bit;
	} else if (type == IRQT_LOW) {
	trigger &= ~bit;
	level &= ~bit;
	} else if (type == IRQT_HIGH) {
	trigger &= ~bit;
	level \|= bit;
	} else {
	/*
	* if type == IRQT_NOEDGE, we should mask interrupts, but
	* be careful to not unmask them if mask was also called.
	* Probably need internal state for mask.
	*/
	printk(KERN_NOTICE "asic3: irq type not changed.\n");
	}
	asic3_write_register(asic, bank + ASIC3_GPIO_LevelTrigger,
	level);
	asic3_write_register(asic, bank + ASIC3_GPIO_EdgeTrigger,
	edge);
	asic3_write_register(asic, bank + ASIC3_GPIO_TriggerType,
	trigger);
	spin_unlock_irqrestore(&asic->lock, flags);
	return 0;
	}

	static struct irq_chip asic3_gpio_irq_chip = {
	.name = "ASIC3-GPIO",
	.ack = asic3_mask_gpio_irq,
	.mask = asic3_mask_gpio_irq,
	.unmask = asic3_unmask_gpio_irq,
	.set_type = asic3_gpio_irq_type,
	};

	static struct irq_chip asic3_irq_chip = {
	.name = "ASIC3",
	.ack = asic3_mask_irq,
	.mask = asic3_mask_irq,
	.unmask = asic3_unmask_irq,
	};

	static int asic3_irq_probe(struct platform_device *pdev)
	{
	struct asic3 *asic = platform_get_drvdata(pdev);
	unsigned long clksel = 0;
	unsigned int irq, irq_base;

	asic->irq_nr = platform_get_irq(pdev, 0);
	if (asic->irq_nr < 0)
	return asic->irq_nr;

	/* turn on clock to IRQ controller */
	clksel \|= CLOCK_SEL_CX;
	asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL),
	clksel);

	irq_base = asic->irq_base;

	for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
	if (irq < asic->irq_base + ASIC3_NUM_GPIOS)
	set_irq_chip(irq, &asic3_gpio_irq_chip);
	else
	set_irq_chip(irq, &asic3_irq_chip);

	set_irq_chip_data(irq, asic);
	set_irq_handler(irq, handle_level_irq);
	set_irq_flags(irq, IRQF_VALID \| IRQF_PROBE);
	}

	asic3_write_register(asic, ASIC3_OFFSET(INTR, IntMask),
	ASIC3_INTMASK_GINTMASK);

	set_irq_chained_handler(asic->irq_nr, asic3_irq_demux);
	set_irq_type(asic->irq_nr, IRQT_RISING);
	set_irq_data(asic->irq_nr, asic);

	return 0;
	}

	static void asic3_irq_remove(struct platform_device *pdev)
	{
	struct asic3 *asic = platform_get_drvdata(pdev);
	unsigned int irq, irq_base;

	irq_base = asic->irq_base;

	for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
	set_irq_flags(irq, 0);
	set_irq_handler(irq, NULL);
	set_irq_chip(irq, NULL);
	set_irq_chip_data(irq, NULL);
	}
	set_irq_chained_handler(asic->irq_nr, NULL);
	}

	/* GPIOs */
	static inline u32 asic3_get_gpio(struct asic3 *asic, unsigned int base,
	unsigned int function)
	{
	return asic3_read_register(asic, base + function);
	}

	static void asic3_set_gpio(struct asic3 *asic, unsigned int base,
	unsigned int function, u32 bits, u32 val)
	{
	unsigned long flags;

	spin_lock_irqsave(&asic->lock, flags);
	val \|= (asic3_read_register(asic, base + function) & ~bits);

	asic3_write_register(asic, base + function, val);
	spin_unlock_irqrestore(&asic->lock, flags);
	}

	#define asic3_get_gpio_a(asic, fn) \
	asic3_get_gpio(asic, ASIC3_GPIO_A_Base, ASIC3_GPIO_##fn)
	#define asic3_get_gpio_b(asic, fn) \
	asic3_get_gpio(asic, ASIC3_GPIO_B_Base, ASIC3_GPIO_##fn)
	#define asic3_get_gpio_c(asic, fn) \
	asic3_get_gpio(asic, ASIC3_GPIO_C_Base, ASIC3_GPIO_##fn)
	#define asic3_get_gpio_d(asic, fn) \
	asic3_get_gpio(asic, ASIC3_GPIO_D_Base, ASIC3_GPIO_##fn)

	#define asic3_set_gpio_a(asic, fn, bits, val) \
	asic3_set_gpio(asic, ASIC3_GPIO_A_Base, ASIC3_GPIO_##fn, bits, val)
	#define asic3_set_gpio_b(asic, fn, bits, val) \
	asic3_set_gpio(asic, ASIC3_GPIO_B_Base, ASIC3_GPIO_##fn, bits, val)
	#define asic3_set_gpio_c(asic, fn, bits, val) \
	asic3_set_gpio(asic, ASIC3_GPIO_C_Base, ASIC3_GPIO_##fn, bits, val)
	#define asic3_set_gpio_d(asic, fn, bits, val) \
	asic3_set_gpio(asic, ASIC3_GPIO_D_Base, ASIC3_GPIO_##fn, bits, val)

	#define asic3_set_gpio_banks(asic, fn, bits, pdata, field) \
	do { \
	asic3_set_gpio_a((asic), fn, (bits), (pdata)->gpio_a.field); \
	asic3_set_gpio_b((asic), fn, (bits), (pdata)->gpio_b.field); \
	asic3_set_gpio_c((asic), fn, (bits), (pdata)->gpio_c.field); \
	asic3_set_gpio_d((asic), fn, (bits), (pdata)->gpio_d.field); \
	} while (0)

	int asic3_gpio_get_value(struct asic3 *asic, unsigned gpio)
	{
	u32 mask = ASIC3_GPIO_bit(gpio);

	switch (gpio >> 4) {
	case ASIC3_GPIO_BANK_A:
	return asic3_get_gpio_a(asic, Status) & mask;
	case ASIC3_GPIO_BANK_B:
	return asic3_get_gpio_b(asic, Status) & mask;
	case ASIC3_GPIO_BANK_C:
	return asic3_get_gpio_c(asic, Status) & mask;
	case ASIC3_GPIO_BANK_D:
	return asic3_get_gpio_d(asic, Status) & mask;
	default:
	printk(KERN_ERR "%s: invalid GPIO value 0x%x",
	__func__, gpio);
	return -EINVAL;
	}
	}
	EXPORT_SYMBOL(asic3_gpio_get_value);

	void asic3_gpio_set_value(struct asic3 *asic, unsigned gpio, int val)
	{
	u32 mask = ASIC3_GPIO_bit(gpio);
	u32 bitval = 0;
	if (val)
	bitval = mask;

	switch (gpio >> 4) {
	case ASIC3_GPIO_BANK_A:
	asic3_set_gpio_a(asic, Out, mask, bitval);
	return;
	case ASIC3_GPIO_BANK_B:
	asic3_set_gpio_b(asic, Out, mask, bitval);
	return;
	case ASIC3_GPIO_BANK_C:
	asic3_set_gpio_c(asic, Out, mask, bitval);
	return;
	case ASIC3_GPIO_BANK_D:
	asic3_set_gpio_d(asic, Out, mask, bitval);
	return;
	default:
	printk(KERN_ERR "%s: invalid GPIO value 0x%x",
	__func__, gpio);
	return;
	}
	}
	EXPORT_SYMBOL(asic3_gpio_set_value);

	static int asic3_gpio_probe(struct platform_device *pdev)
	{
	struct asic3_platform_data *pdata = pdev->dev.platform_data;
	struct asic3 *asic = platform_get_drvdata(pdev);

	asic3_write_register(asic, ASIC3_GPIO_OFFSET(A, Mask), 0xffff);
	asic3_write_register(asic, ASIC3_GPIO_OFFSET(B, Mask), 0xffff);
	asic3_write_register(asic, ASIC3_GPIO_OFFSET(C, Mask), 0xffff);
	asic3_write_register(asic, ASIC3_GPIO_OFFSET(D, Mask), 0xffff);

	asic3_set_gpio_a(asic, SleepMask, 0xffff, 0xffff);
	asic3_set_gpio_b(asic, SleepMask, 0xffff, 0xffff);
	asic3_set_gpio_c(asic, SleepMask, 0xffff, 0xffff);
	asic3_set_gpio_d(asic, SleepMask, 0xffff, 0xffff);

	if (pdata) {
	asic3_set_gpio_banks(asic, Out, 0xffff, pdata, init);
	asic3_set_gpio_banks(asic, Direction, 0xffff, pdata, dir);
	asic3_set_gpio_banks(asic, SleepMask, 0xffff, pdata,
	sleep_mask);
	asic3_set_gpio_banks(asic, SleepOut, 0xffff, pdata, sleep_out);
	asic3_set_gpio_banks(asic, BattFaultOut, 0xffff, pdata,
	batt_fault_out);
	asic3_set_gpio_banks(asic, SleepConf, 0xffff, pdata,
	sleep_conf);
	asic3_set_gpio_banks(asic, AltFunction, 0xffff, pdata,
	alt_function);
	}

	return 0;
	}

	static void asic3_gpio_remove(struct platform_device *pdev)
	{
	return;
	}


	/* Core */
	static int asic3_probe(struct platform_device *pdev)
	{
	struct asic3_platform_data *pdata = pdev->dev.platform_data;
	struct asic3 *asic;
	struct resource *mem;
	unsigned long clksel;
	int ret;

	asic = kzalloc(sizeof(struct asic3), GFP_KERNEL);
	if (!asic)
	return -ENOMEM;

	spin_lock_init(&asic->lock);
	platform_set_drvdata(pdev, asic);
	asic->dev = &pdev->dev;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
	ret = -ENOMEM;
	printk(KERN_ERR "asic3: no MEM resource\n");
	goto err_out_1;
	}

	asic->mapping = ioremap(mem->start, PAGE_SIZE);
	if (!asic->mapping) {
	ret = -ENOMEM;
	printk(KERN_ERR "asic3: couldn't ioremap\n");
	goto err_out_1;
	}

	asic->irq_base = pdata->irq_base;

	if (pdata && pdata->bus_shift)
	asic->bus_shift = 2 - pdata->bus_shift;
	else
	asic->bus_shift = 0;

	clksel = 0;
	asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel);

	ret = asic3_irq_probe(pdev);
	if (ret < 0) {
	printk(KERN_ERR "asic3: couldn't probe IRQs\n");
	goto err_out_2;
	}
	asic3_gpio_probe(pdev);

	if (pdata->children) {
	int i;
	for (i = 0; i < pdata->n_children; i++) {
	pdata->children[i]->dev.parent = &pdev->dev;
	platform_device_register(pdata->children[i]);
	}
	}

	printk(KERN_INFO "ASIC3 Core driver\n");

	return 0;

	err_out_2:
	iounmap(asic->mapping);
	err_out_1:
	kfree(asic);

	return ret;
	}

	static int asic3_remove(struct platform_device *pdev)
	{
	struct asic3 *asic = platform_get_drvdata(pdev);

	asic3_gpio_remove(pdev);
	asic3_irq_remove(pdev);

	asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), 0);

	iounmap(asic->mapping);

	kfree(asic);

	return 0;
	}

	static void asic3_shutdown(struct platform_device *pdev)
	{
	}

	static struct platform_driver asic3_device_driver = {
	.driver = {
	.name = "asic3",
	},
	.probe = asic3_probe,
	.remove = __devexit_p(asic3_remove),
	.shutdown = asic3_shutdown,
	};

	static int __init asic3_init(void)
	{
	int retval = 0;
	retval = platform_driver_register(&asic3_device_driver);
	return retval;
	}

	subsys_initcall(asic3_init);