arch/arm/mach-omap2/irq.c - maze/linux - Git at Google

 /*
  * linux/arch/arm/mach-omap2/irq.c
  *
  * Interrupt handler for OMAP2 boards.
  *
  * Copyright (C) 2005 Nokia Corporation
  * Author: Paul Mundt <paul.mundt@nokia.com>
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License. See the file "COPYING" in the main directory of this archive
  * for more details.
  */
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <mach/hardware.h>
 #include <asm/mach/irq.h>


 /* selected INTC register offsets */

 #define INTC_REVISION		0x0000
 #define INTC_SYSCONFIG		0x0010
 #define INTC_SYSSTATUS		0x0014
 #define INTC_SIR		0x0040
 #define INTC_CONTROL		0x0048
 #define INTC_PROTECTION		0x004C
 #define INTC_IDLE		0x0050
 #define INTC_THRESHOLD		0x0068
 #define INTC_MIR0		0x0084
 #define INTC_MIR_CLEAR0		0x0088
 #define INTC_MIR_SET0		0x008c
 #define INTC_PENDING_IRQ0	0x0098
 /* Number of IRQ state bits in each MIR register */
 #define IRQ_BITS_PER_REG	32

 /*
  * OMAP2 has a number of different interrupt controllers, each interrupt
  * controller is identified as its own "bank". Register definitions are
  * fairly consistent for each bank, but not all registers are implemented
  * for each bank.. when in doubt, consult the TRM.
  */
 static struct omap_irq_bank {
 	void __iomem *base_reg;
 	unsigned int nr_irqs;
 } __attribute__ ((aligned(4))) irq_banks[] = {
 	{
 		/* MPU INTC */
 		.nr_irqs	= 96,
 	},
 };

 /* Structure to save interrupt controller context */
 struct omap3_intc_regs {
 	u32 sysconfig;
 	u32 protection;
 	u32 idle;
 	u32 threshold;
 	u32 ilr[INTCPS_NR_IRQS];
 	u32 mir[INTCPS_NR_MIR_REGS];
 };

 static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)];

 /* INTC bank register get/set */

 static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg)
 {
 	__raw_writel(val, bank->base_reg + reg);
 }

 static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg)
 {
 	return __raw_readl(bank->base_reg + reg);
 }

 static int previous_irq;

 /*
  * On 34xx we can get occasional spurious interrupts if the ack from
  * an interrupt handler does not get posted before we unmask. Warn about
  * the interrupt handlers that need to flush posted writes.
  */
 static int omap_check_spurious(unsigned int irq)
 {
 	u32 sir, spurious;

 	sir = intc_bank_read_reg(&irq_banks[0], INTC_SIR);
 	spurious = sir >> 7;

 	if (spurious) {
 		printk(KERN_WARNING "Spurious irq %i: 0x%08x, please flush "
 					"posted write for irq %i\n",
 					irq, sir, previous_irq);
 		return spurious;
 	}

 	return 0;
 }

 /* XXX: FIQ and additional INTC support (only MPU at the moment) */
 static void omap_ack_irq(unsigned int irq)
 {
 	intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL);
 }

 static void omap_mask_irq(unsigned int irq)
 {
 	int offset = irq & (~(IRQ_BITS_PER_REG - 1));

 	if (cpu_is_omap34xx()) {
 		int spurious = 0;

 		/*
 		 * INT_34XX_GPT12_IRQ is also the spurious irq. Maybe because
 		 * it is the highest irq number?
 		 */
 		if (irq == INT_34XX_GPT12_IRQ)
 			spurious = omap_check_spurious(irq);

 		if (!spurious)
 			previous_irq = irq;
 	}

 	irq &= (IRQ_BITS_PER_REG - 1);

 	intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_SET0 + offset);
 }

 static void omap_unmask_irq(unsigned int irq)
 {
 	int offset = irq & (~(IRQ_BITS_PER_REG - 1));

 	irq &= (IRQ_BITS_PER_REG - 1);

 	intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_CLEAR0 + offset);
 }

 static void omap_mask_ack_irq(unsigned int irq)
 {
 	omap_mask_irq(irq);
 	omap_ack_irq(irq);
 }

 static struct irq_chip omap_irq_chip = {
 	.name	= "INTC",
 	.ack	= omap_mask_ack_irq,
 	.mask	= omap_mask_irq,
 	.unmask	= omap_unmask_irq,
 };

 static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank)
 {
 	unsigned long tmp;

 	tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff;
 	printk(KERN_INFO "IRQ: Found an INTC at 0x%p "
 			 "(revision %ld.%ld) with %d interrupts\n",
 			 bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs);

 	tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG);
 	tmp |= 1 << 1;	/* soft reset */
 	intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG);

 	while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1))
 		/* Wait for reset to complete */;

 	/* Enable autoidle */
 	intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG);
 }

 int omap_irq_pending(void)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
 		struct omap_irq_bank *bank = irq_banks + i;
 		int irq;

 		for (irq = 0; irq < bank->nr_irqs; irq += 32)
 			if (intc_bank_read_reg(bank, INTC_PENDING_IRQ0 +
 					       ((irq >> 5) << 5)))
 				return 1;
 	}
 	return 0;
 }

 void __init omap_init_irq(void)
 {
 	unsigned long nr_of_irqs = 0;
 	unsigned int nr_banks = 0;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
 		unsigned long base = 0;
 		struct omap_irq_bank *bank = irq_banks + i;

 		if (cpu_is_omap24xx())
 			base = OMAP24XX_IC_BASE;
 		else if (cpu_is_omap34xx())
 			base = OMAP34XX_IC_BASE;

 		BUG_ON(!base);

 		/* Static mapping, never released */
 		bank->base_reg = ioremap(base, SZ_4K);
 		if (!bank->base_reg) {
 			printk(KERN_ERR "Could not ioremap irq bank%i\n", i);
 			continue;
 		}

 		omap_irq_bank_init_one(bank);

 		nr_of_irqs += bank->nr_irqs;
 		nr_banks++;
 	}

 	printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n",
 	       nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : "");

 	for (i = 0; i < nr_of_irqs; i++) {
 		set_irq_chip(i, &omap_irq_chip);
 		set_irq_handler(i, handle_level_irq);
 		set_irq_flags(i, IRQF_VALID);
 	}
 }

 #ifdef CONFIG_ARCH_OMAP3
 void omap_intc_save_context(void)
 {
 	int ind = 0, i = 0;
 	for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) {
 		struct omap_irq_bank *bank = irq_banks + ind;
 		intc_context[ind].sysconfig =
 			intc_bank_read_reg(bank, INTC_SYSCONFIG);
 		intc_context[ind].protection =
 			intc_bank_read_reg(bank, INTC_PROTECTION);
 		intc_context[ind].idle =
 			intc_bank_read_reg(bank, INTC_IDLE);
 		intc_context[ind].threshold =
 			intc_bank_read_reg(bank, INTC_THRESHOLD);
 		for (i = 0; i < INTCPS_NR_IRQS; i++)
 			intc_context[ind].ilr[i] =
 				intc_bank_read_reg(bank, (0x100 + 0x4*i));
 		for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
 			intc_context[ind].mir[i] =
 				intc_bank_read_reg(&irq_banks[0], INTC_MIR0 +
 				(0x20 * i));
 	}
 }

 void omap_intc_restore_context(void)
 {
 	int ind = 0, i = 0;

 	for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) {
 		struct omap_irq_bank *bank = irq_banks + ind;
 		intc_bank_write_reg(intc_context[ind].sysconfig,
 					bank, INTC_SYSCONFIG);
 		intc_bank_write_reg(intc_context[ind].sysconfig,
 					bank, INTC_SYSCONFIG);
 		intc_bank_write_reg(intc_context[ind].protection,
 					bank, INTC_PROTECTION);
 		intc_bank_write_reg(intc_context[ind].idle,
 					bank, INTC_IDLE);
 		intc_bank_write_reg(intc_context[ind].threshold,
 					bank, INTC_THRESHOLD);
 		for (i = 0; i < INTCPS_NR_IRQS; i++)
 			intc_bank_write_reg(intc_context[ind].ilr[i],
 				bank, (0x100 + 0x4*i));
 		for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
 			intc_bank_write_reg(intc_context[ind].mir[i],
 				 &irq_banks[0], INTC_MIR0 + (0x20 * i));
 	}
 	/* MIRs are saved and restore with other PRCM registers */
 }

 void omap3_intc_suspend(void)
 {
 	/* A pending interrupt would prevent OMAP from entering suspend */
 	omap_ack_irq(0);
 }

 void omap3_intc_prepare_idle(void)
 {
 	/* Disable autoidle as it can stall interrupt controller */
 	intc_bank_write_reg(0, &irq_banks[0], INTC_SYSCONFIG);
 }

 void omap3_intc_resume_idle(void)
 {
 	/* Re-enable autoidle */
 	intc_bank_write_reg(1, &irq_banks[0], INTC_SYSCONFIG);
 }
 #endif /* CONFIG_ARCH_OMAP3 */
	/*
	* linux/arch/arm/mach-omap2/irq.c
	*
	* Interrupt handler for OMAP2 boards.
	*
	* Copyright (C) 2005 Nokia Corporation
	* Author: Paul Mundt <paul.mundt@nokia.com>
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*/
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <mach/hardware.h>
	#include <asm/mach/irq.h>


	/* selected INTC register offsets */

	#define INTC_REVISION 0x0000
	#define INTC_SYSCONFIG 0x0010
	#define INTC_SYSSTATUS 0x0014
	#define INTC_SIR 0x0040
	#define INTC_CONTROL 0x0048
	#define INTC_PROTECTION 0x004C
	#define INTC_IDLE 0x0050
	#define INTC_THRESHOLD 0x0068
	#define INTC_MIR0 0x0084
	#define INTC_MIR_CLEAR0 0x0088
	#define INTC_MIR_SET0 0x008c
	#define INTC_PENDING_IRQ0 0x0098
	/* Number of IRQ state bits in each MIR register */
	#define IRQ_BITS_PER_REG 32

	/*
	* OMAP2 has a number of different interrupt controllers, each interrupt
	* controller is identified as its own "bank". Register definitions are
	* fairly consistent for each bank, but not all registers are implemented
	* for each bank.. when in doubt, consult the TRM.
	*/
	static struct omap_irq_bank {
	void __iomem *base_reg;
	unsigned int nr_irqs;
	} __attribute__ ((aligned(4))) irq_banks[] = {
	{
	/* MPU INTC */
	.nr_irqs = 96,
	},
	};

	/* Structure to save interrupt controller context */
	struct omap3_intc_regs {
	u32 sysconfig;
	u32 protection;
	u32 idle;
	u32 threshold;
	u32 ilr[INTCPS_NR_IRQS];
	u32 mir[INTCPS_NR_MIR_REGS];
	};

	static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)];

	/* INTC bank register get/set */

	static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg)
	{
	__raw_writel(val, bank->base_reg + reg);
	}

	static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg)
	{
	return __raw_readl(bank->base_reg + reg);
	}

	static int previous_irq;

	/*
	* On 34xx we can get occasional spurious interrupts if the ack from
	* an interrupt handler does not get posted before we unmask. Warn about
	* the interrupt handlers that need to flush posted writes.
	*/
	static int omap_check_spurious(unsigned int irq)
	{
	u32 sir, spurious;

	sir = intc_bank_read_reg(&irq_banks[0], INTC_SIR);
	spurious = sir >> 7;

	if (spurious) {
	printk(KERN_WARNING "Spurious irq %i: 0x%08x, please flush "
	"posted write for irq %i\n",
	irq, sir, previous_irq);
	return spurious;
	}

	return 0;
	}

	/* XXX: FIQ and additional INTC support (only MPU at the moment) */
	static void omap_ack_irq(unsigned int irq)
	{
	intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL);
	}

	static void omap_mask_irq(unsigned int irq)
	{
	int offset = irq & (~(IRQ_BITS_PER_REG - 1));

	if (cpu_is_omap34xx()) {
	int spurious = 0;

	/*
	* INT_34XX_GPT12_IRQ is also the spurious irq. Maybe because
	* it is the highest irq number?
	*/
	if (irq == INT_34XX_GPT12_IRQ)
	spurious = omap_check_spurious(irq);

	if (!spurious)
	previous_irq = irq;
	}

	irq &= (IRQ_BITS_PER_REG - 1);

	intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_SET0 + offset);
	}

	static void omap_unmask_irq(unsigned int irq)
	{
	int offset = irq & (~(IRQ_BITS_PER_REG - 1));

	irq &= (IRQ_BITS_PER_REG - 1);

	intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_CLEAR0 + offset);
	}

	static void omap_mask_ack_irq(unsigned int irq)
	{
	omap_mask_irq(irq);
	omap_ack_irq(irq);
	}

	static struct irq_chip omap_irq_chip = {
	.name = "INTC",
	.ack = omap_mask_ack_irq,
	.mask = omap_mask_irq,
	.unmask = omap_unmask_irq,
	};

	static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank)
	{
	unsigned long tmp;

	tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff;
	printk(KERN_INFO "IRQ: Found an INTC at 0x%p "
	"(revision %ld.%ld) with %d interrupts\n",
	bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs);

	tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG);
	tmp \|= 1 << 1; /* soft reset */
	intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG);

	while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1))
	/* Wait for reset to complete */;

	/* Enable autoidle */
	intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG);
	}

	int omap_irq_pending(void)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
	struct omap_irq_bank *bank = irq_banks + i;
	int irq;

	for (irq = 0; irq < bank->nr_irqs; irq += 32)
	if (intc_bank_read_reg(bank, INTC_PENDING_IRQ0 +
	((irq >> 5) << 5)))
	return 1;
	}
	return 0;
	}

	void __init omap_init_irq(void)
	{
	unsigned long nr_of_irqs = 0;
	unsigned int nr_banks = 0;
	int i;

	for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
	unsigned long base = 0;
	struct omap_irq_bank *bank = irq_banks + i;

	if (cpu_is_omap24xx())
	base = OMAP24XX_IC_BASE;
	else if (cpu_is_omap34xx())
	base = OMAP34XX_IC_BASE;

	BUG_ON(!base);

	/* Static mapping, never released */
	bank->base_reg = ioremap(base, SZ_4K);
	if (!bank->base_reg) {
	printk(KERN_ERR "Could not ioremap irq bank%i\n", i);
	continue;
	}

	omap_irq_bank_init_one(bank);

	nr_of_irqs += bank->nr_irqs;
	nr_banks++;
	}

	printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n",
	nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : "");

	for (i = 0; i < nr_of_irqs; i++) {
	set_irq_chip(i, &omap_irq_chip);
	set_irq_handler(i, handle_level_irq);
	set_irq_flags(i, IRQF_VALID);
	}
	}

	#ifdef CONFIG_ARCH_OMAP3
	void omap_intc_save_context(void)
	{
	int ind = 0, i = 0;
	for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) {
	struct omap_irq_bank *bank = irq_banks + ind;
	intc_context[ind].sysconfig =
	intc_bank_read_reg(bank, INTC_SYSCONFIG);
	intc_context[ind].protection =
	intc_bank_read_reg(bank, INTC_PROTECTION);
	intc_context[ind].idle =
	intc_bank_read_reg(bank, INTC_IDLE);
	intc_context[ind].threshold =
	intc_bank_read_reg(bank, INTC_THRESHOLD);
	for (i = 0; i < INTCPS_NR_IRQS; i++)
	intc_context[ind].ilr[i] =
	intc_bank_read_reg(bank, (0x100 + 0x4*i));
	for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
	intc_context[ind].mir[i] =
	intc_bank_read_reg(&irq_banks[0], INTC_MIR0 +
	(0x20 * i));
	}
	}

	void omap_intc_restore_context(void)
	{
	int ind = 0, i = 0;

	for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) {
	struct omap_irq_bank *bank = irq_banks + ind;
	intc_bank_write_reg(intc_context[ind].sysconfig,
	bank, INTC_SYSCONFIG);
	intc_bank_write_reg(intc_context[ind].sysconfig,
	bank, INTC_SYSCONFIG);
	intc_bank_write_reg(intc_context[ind].protection,
	bank, INTC_PROTECTION);
	intc_bank_write_reg(intc_context[ind].idle,
	bank, INTC_IDLE);
	intc_bank_write_reg(intc_context[ind].threshold,
	bank, INTC_THRESHOLD);
	for (i = 0; i < INTCPS_NR_IRQS; i++)
	intc_bank_write_reg(intc_context[ind].ilr[i],
	bank, (0x100 + 0x4*i));
	for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
	intc_bank_write_reg(intc_context[ind].mir[i],
	&irq_banks[0], INTC_MIR0 + (0x20 * i));
	}
	/* MIRs are saved and restore with other PRCM registers */
	}

	void omap3_intc_suspend(void)
	{
	/* A pending interrupt would prevent OMAP from entering suspend */
	omap_ack_irq(0);
	}

	void omap3_intc_prepare_idle(void)
	{
	/* Disable autoidle as it can stall interrupt controller */
	intc_bank_write_reg(0, &irq_banks[0], INTC_SYSCONFIG);
	}

	void omap3_intc_resume_idle(void)
	{
	/* Re-enable autoidle */
	intc_bank_write_reg(1, &irq_banks[0], INTC_SYSCONFIG);
	}
	#endif /* CONFIG_ARCH_OMAP3 */