arch/mips/cavium-octeon/octeon-irq.c - linux/kernel/git/davem/net-next - Git at Google

 /*
  * 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.
  *
  * Copyright (C) 2004-2008 Cavium Networks
  */
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/hardirq.h>

 #include <asm/octeon/octeon.h>

 DEFINE_RWLOCK(octeon_irq_ciu0_rwlock);
 DEFINE_RWLOCK(octeon_irq_ciu1_rwlock);
 DEFINE_SPINLOCK(octeon_irq_msi_lock);

 static void octeon_irq_core_ack(unsigned int irq)
 {
 	unsigned int bit = irq - OCTEON_IRQ_SW0;
 	/*
 	 * We don't need to disable IRQs to make these atomic since
 	 * they are already disabled earlier in the low level
 	 * interrupt code.
 	 */
 	clear_c0_status(0x100 << bit);
 	/* The two user interrupts must be cleared manually. */
 	if (bit < 2)
 		clear_c0_cause(0x100 << bit);
 }

 static void octeon_irq_core_eoi(unsigned int irq)
 {
 	struct irq_desc *desc = irq_desc + irq;
 	unsigned int bit = irq - OCTEON_IRQ_SW0;
 	/*
 	 * If an IRQ is being processed while we are disabling it the
 	 * handler will attempt to unmask the interrupt after it has
 	 * been disabled.
 	 */
 	if (desc->status & IRQ_DISABLED)
 		return;

 	/* There is a race here.  We should fix it.  */

 	/*
 	 * We don't need to disable IRQs to make these atomic since
 	 * they are already disabled earlier in the low level
 	 * interrupt code.
 	 */
 	set_c0_status(0x100 << bit);
 }

 static void octeon_irq_core_enable(unsigned int irq)
 {
 	unsigned long flags;
 	unsigned int bit = irq - OCTEON_IRQ_SW0;

 	/*
 	 * We need to disable interrupts to make sure our updates are
 	 * atomic.
 	 */
 	local_irq_save(flags);
 	set_c0_status(0x100 << bit);
 	local_irq_restore(flags);
 }

 static void octeon_irq_core_disable_local(unsigned int irq)
 {
 	unsigned long flags;
 	unsigned int bit = irq - OCTEON_IRQ_SW0;
 	/*
 	 * We need to disable interrupts to make sure our updates are
 	 * atomic.
 	 */
 	local_irq_save(flags);
 	clear_c0_status(0x100 << bit);
 	local_irq_restore(flags);
 }

 static void octeon_irq_core_disable(unsigned int irq)
 {
 #ifdef CONFIG_SMP
 	on_each_cpu((void (*)(void *)) octeon_irq_core_disable_local,
 		    (void *) (long) irq, 1);
 #else
 	octeon_irq_core_disable_local(irq);
 #endif
 }

 static struct irq_chip octeon_irq_chip_core = {
 	.name = "Core",
 	.enable = octeon_irq_core_enable,
 	.disable = octeon_irq_core_disable,
 	.ack = octeon_irq_core_ack,
 	.eoi = octeon_irq_core_eoi,
 };


 static void octeon_irq_ciu0_ack(unsigned int irq)
 {
 	/*
 	 * In order to avoid any locking accessing the CIU, we
 	 * acknowledge CIU interrupts by disabling all of them.  This
 	 * way we can use a per core register and avoid any out of
 	 * core locking requirements.  This has the side affect that
 	 * CIU interrupts can't be processed recursively.
 	 *
 	 * We don't need to disable IRQs to make these atomic since
 	 * they are already disabled earlier in the low level
 	 * interrupt code.
 	 */
 	clear_c0_status(0x100 << 2);
 }

 static void octeon_irq_ciu0_eoi(unsigned int irq)
 {
 	/*
 	 * Enable all CIU interrupts again.  We don't need to disable
 	 * IRQs to make these atomic since they are already disabled
 	 * earlier in the low level interrupt code.
 	 */
 	set_c0_status(0x100 << 2);
 }

 static void octeon_irq_ciu0_enable(unsigned int irq)
 {
 	int coreid = cvmx_get_core_num();
 	unsigned long flags;
 	uint64_t en0;
 	int bit = irq - OCTEON_IRQ_WORKQ0;	/* Bit 0-63 of EN0 */

 	/*
 	 * A read lock is used here to make sure only one core is ever
 	 * updating the CIU enable bits at a time. During an enable
 	 * the cores don't interfere with each other. During a disable
 	 * the write lock stops any enables that might cause a
 	 * problem.
 	 */
 	read_lock_irqsave(&octeon_irq_ciu0_rwlock, flags);
 	en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
 	en0 |= 1ull << bit;
 	cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
 	cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
 	read_unlock_irqrestore(&octeon_irq_ciu0_rwlock, flags);
 }

 static void octeon_irq_ciu0_disable(unsigned int irq)
 {
 	int bit = irq - OCTEON_IRQ_WORKQ0;	/* Bit 0-63 of EN0 */
 	unsigned long flags;
 	uint64_t en0;
 #ifdef CONFIG_SMP
 	int cpu;
 	write_lock_irqsave(&octeon_irq_ciu0_rwlock, flags);
 	for_each_online_cpu(cpu) {
 		int coreid = cpu_logical_map(cpu);
 		en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
 		en0 &= ~(1ull << bit);
 		cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
 	}
 	/*
 	 * We need to do a read after the last update to make sure all
 	 * of them are done.
 	 */
 	cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num() * 2));
 	write_unlock_irqrestore(&octeon_irq_ciu0_rwlock, flags);
 #else
 	int coreid = cvmx_get_core_num();
 	local_irq_save(flags);
 	en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
 	en0 &= ~(1ull << bit);
 	cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
 	cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
 	local_irq_restore(flags);
 #endif
 }

 #ifdef CONFIG_SMP
 static void octeon_irq_ciu0_set_affinity(unsigned int irq, const struct cpumask *dest)
 {
 	int cpu;
 	int bit = irq - OCTEON_IRQ_WORKQ0;	/* Bit 0-63 of EN0 */

 	write_lock(&octeon_irq_ciu0_rwlock);
 	for_each_online_cpu(cpu) {
 		int coreid = cpu_logical_map(cpu);
 		uint64_t en0 =
 			cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
 		if (cpumask_test_cpu(cpu, dest))
 			en0 |= 1ull << bit;
 		else
 			en0 &= ~(1ull << bit);
 		cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
 	}
 	/*
 	 * We need to do a read after the last update to make sure all
 	 * of them are done.
 	 */
 	cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num() * 2));
 	write_unlock(&octeon_irq_ciu0_rwlock);
 }
 #endif

 static struct irq_chip octeon_irq_chip_ciu0 = {
 	.name = "CIU0",
 	.enable = octeon_irq_ciu0_enable,
 	.disable = octeon_irq_ciu0_disable,
 	.ack = octeon_irq_ciu0_ack,
 	.eoi = octeon_irq_ciu0_eoi,
 #ifdef CONFIG_SMP
 	.set_affinity = octeon_irq_ciu0_set_affinity,
 #endif
 };


 static void octeon_irq_ciu1_ack(unsigned int irq)
 {
 	/*
 	 * In order to avoid any locking accessing the CIU, we
 	 * acknowledge CIU interrupts by disabling all of them.  This
 	 * way we can use a per core register and avoid any out of
 	 * core locking requirements.  This has the side affect that
 	 * CIU interrupts can't be processed recursively.  We don't
 	 * need to disable IRQs to make these atomic since they are
 	 * already disabled earlier in the low level interrupt code.
 	 */
 	clear_c0_status(0x100 << 3);
 }

 static void octeon_irq_ciu1_eoi(unsigned int irq)
 {
 	/*
 	 * Enable all CIU interrupts again.  We don't need to disable
 	 * IRQs to make these atomic since they are already disabled
 	 * earlier in the low level interrupt code.
 	 */
 	set_c0_status(0x100 << 3);
 }

 static void octeon_irq_ciu1_enable(unsigned int irq)
 {
 	int coreid = cvmx_get_core_num();
 	unsigned long flags;
 	uint64_t en1;
 	int bit = irq - OCTEON_IRQ_WDOG0;	/* Bit 0-63 of EN1 */

 	/*
 	 * A read lock is used here to make sure only one core is ever
 	 * updating the CIU enable bits at a time.  During an enable
 	 * the cores don't interfere with each other.  During a disable
 	 * the write lock stops any enables that might cause a
 	 * problem.
 	 */
 	read_lock_irqsave(&octeon_irq_ciu1_rwlock, flags);
 	en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
 	en1 |= 1ull << bit;
 	cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
 	cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
 	read_unlock_irqrestore(&octeon_irq_ciu1_rwlock, flags);
 }

 static void octeon_irq_ciu1_disable(unsigned int irq)
 {
 	int bit = irq - OCTEON_IRQ_WDOG0;	/* Bit 0-63 of EN1 */
 	unsigned long flags;
 	uint64_t en1;
 #ifdef CONFIG_SMP
 	int cpu;
 	write_lock_irqsave(&octeon_irq_ciu1_rwlock, flags);
 	for_each_online_cpu(cpu) {
 		int coreid = cpu_logical_map(cpu);
 		en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
 		en1 &= ~(1ull << bit);
 		cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
 	}
 	/*
 	 * We need to do a read after the last update to make sure all
 	 * of them are done.
 	 */
 	cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num() * 2 + 1));
 	write_unlock_irqrestore(&octeon_irq_ciu1_rwlock, flags);
 #else
 	int coreid = cvmx_get_core_num();
 	local_irq_save(flags);
 	en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
 	en1 &= ~(1ull << bit);
 	cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
 	cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
 	local_irq_restore(flags);
 #endif
 }

 #ifdef CONFIG_SMP
 static void octeon_irq_ciu1_set_affinity(unsigned int irq, const struct cpumask *dest)
 {
 	int cpu;
 	int bit = irq - OCTEON_IRQ_WDOG0;	/* Bit 0-63 of EN1 */

 	write_lock(&octeon_irq_ciu1_rwlock);
 	for_each_online_cpu(cpu) {
 		int coreid = cpu_logical_map(cpu);
 		uint64_t en1 =
 			cvmx_read_csr(CVMX_CIU_INTX_EN1
 				(coreid * 2 + 1));
 		if (cpumask_test_cpu(cpu, dest))
 			en1 |= 1ull << bit;
 		else
 			en1 &= ~(1ull << bit);
 		cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
 	}
 	/*
 	 * We need to do a read after the last update to make sure all
 	 * of them are done.
 	 */
 	cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num() * 2 + 1));
 	write_unlock(&octeon_irq_ciu1_rwlock);
 }
 #endif

 static struct irq_chip octeon_irq_chip_ciu1 = {
 	.name = "CIU1",
 	.enable = octeon_irq_ciu1_enable,
 	.disable = octeon_irq_ciu1_disable,
 	.ack = octeon_irq_ciu1_ack,
 	.eoi = octeon_irq_ciu1_eoi,
 #ifdef CONFIG_SMP
 	.set_affinity = octeon_irq_ciu1_set_affinity,
 #endif
 };

 #ifdef CONFIG_PCI_MSI

 static void octeon_irq_msi_ack(unsigned int irq)
 {
 	if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
 		/* These chips have PCI */
 		cvmx_write_csr(CVMX_NPI_NPI_MSI_RCV,
 			       1ull << (irq - OCTEON_IRQ_MSI_BIT0));
 	} else {
 		/*
 		 * These chips have PCIe. Thankfully the ACK doesn't
 		 * need any locking.
 		 */
 		cvmx_write_csr(CVMX_PEXP_NPEI_MSI_RCV0,
 			       1ull << (irq - OCTEON_IRQ_MSI_BIT0));
 	}
 }

 static void octeon_irq_msi_eoi(unsigned int irq)
 {
 	/* Nothing needed */
 }

 static void octeon_irq_msi_enable(unsigned int irq)
 {
 	if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
 		/*
 		 * Octeon PCI doesn't have the ability to mask/unmask
 		 * MSI interrupts individually.  Instead of
 		 * masking/unmasking them in groups of 16, we simple
 		 * assume MSI devices are well behaved.  MSI
 		 * interrupts are always enable and the ACK is assumed
 		 * to be enough.
 		 */
 	} else {
 		/* These chips have PCIe.  Note that we only support
 		 * the first 64 MSI interrupts.  Unfortunately all the
 		 * MSI enables are in the same register.  We use
 		 * MSI0's lock to control access to them all.
 		 */
 		uint64_t en;
 		unsigned long flags;
 		spin_lock_irqsave(&octeon_irq_msi_lock, flags);
 		en = cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
 		en |= 1ull << (irq - OCTEON_IRQ_MSI_BIT0);
 		cvmx_write_csr(CVMX_PEXP_NPEI_MSI_ENB0, en);
 		cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
 		spin_unlock_irqrestore(&octeon_irq_msi_lock, flags);
 	}
 }

 static void octeon_irq_msi_disable(unsigned int irq)
 {
 	if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
 		/* See comment in enable */
 	} else {
 		/*
 		 * These chips have PCIe.  Note that we only support
 		 * the first 64 MSI interrupts.  Unfortunately all the
 		 * MSI enables are in the same register.  We use
 		 * MSI0's lock to control access to them all.
 		 */
 		uint64_t en;
 		unsigned long flags;
 		spin_lock_irqsave(&octeon_irq_msi_lock, flags);
 		en = cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
 		en &= ~(1ull << (irq - OCTEON_IRQ_MSI_BIT0));
 		cvmx_write_csr(CVMX_PEXP_NPEI_MSI_ENB0, en);
 		cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
 		spin_unlock_irqrestore(&octeon_irq_msi_lock, flags);
 	}
 }

 static struct irq_chip octeon_irq_chip_msi = {
 	.name = "MSI",
 	.enable = octeon_irq_msi_enable,
 	.disable = octeon_irq_msi_disable,
 	.ack = octeon_irq_msi_ack,
 	.eoi = octeon_irq_msi_eoi,
 };
 #endif

 void __init arch_init_irq(void)
 {
 	int irq;

 #ifdef CONFIG_SMP
 	/* Set the default affinity to the boot cpu. */
 	cpumask_clear(irq_default_affinity);
 	cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
 #endif

 	if (NR_IRQS < OCTEON_IRQ_LAST)
 		pr_err("octeon_irq_init: NR_IRQS is set too low\n");

 	/* 0 - 15 reserved for i8259 master and slave controller. */

 	/* 17 - 23 Mips internal */
 	for (irq = OCTEON_IRQ_SW0; irq <= OCTEON_IRQ_TIMER; irq++) {
 		set_irq_chip_and_handler(irq, &octeon_irq_chip_core,
 					 handle_percpu_irq);
 	}

 	/* 24 - 87 CIU_INT_SUM0 */
 	for (irq = OCTEON_IRQ_WORKQ0; irq <= OCTEON_IRQ_BOOTDMA; irq++) {
 		set_irq_chip_and_handler(irq, &octeon_irq_chip_ciu0,
 					 handle_percpu_irq);
 	}

 	/* 88 - 151 CIU_INT_SUM1 */
 	for (irq = OCTEON_IRQ_WDOG0; irq <= OCTEON_IRQ_RESERVED151; irq++) {
 		set_irq_chip_and_handler(irq, &octeon_irq_chip_ciu1,
 					 handle_percpu_irq);
 	}

 #ifdef CONFIG_PCI_MSI
 	/* 152 - 215 PCI/PCIe MSI interrupts */
 	for (irq = OCTEON_IRQ_MSI_BIT0; irq <= OCTEON_IRQ_MSI_BIT63; irq++) {
 		set_irq_chip_and_handler(irq, &octeon_irq_chip_msi,
 					 handle_percpu_irq);
 	}
 #endif
 	set_c0_status(0x300 << 2);
 }

 asmlinkage void plat_irq_dispatch(void)
 {
 	const unsigned long core_id = cvmx_get_core_num();
 	const uint64_t ciu_sum0_address = CVMX_CIU_INTX_SUM0(core_id * 2);
 	const uint64_t ciu_en0_address = CVMX_CIU_INTX_EN0(core_id * 2);
 	const uint64_t ciu_sum1_address = CVMX_CIU_INT_SUM1;
 	const uint64_t ciu_en1_address = CVMX_CIU_INTX_EN1(core_id * 2 + 1);
 	unsigned long cop0_cause;
 	unsigned long cop0_status;
 	uint64_t ciu_en;
 	uint64_t ciu_sum;

 	while (1) {
 		cop0_cause = read_c0_cause();
 		cop0_status = read_c0_status();
 		cop0_cause &= cop0_status;
 		cop0_cause &= ST0_IM;

 		if (unlikely(cop0_cause & STATUSF_IP2)) {
 			ciu_sum = cvmx_read_csr(ciu_sum0_address);
 			ciu_en = cvmx_read_csr(ciu_en0_address);
 			ciu_sum &= ciu_en;
 			if (likely(ciu_sum))
 				do_IRQ(fls64(ciu_sum) + OCTEON_IRQ_WORKQ0 - 1);
 			else
 				spurious_interrupt();
 		} else if (unlikely(cop0_cause & STATUSF_IP3)) {
 			ciu_sum = cvmx_read_csr(ciu_sum1_address);
 			ciu_en = cvmx_read_csr(ciu_en1_address);
 			ciu_sum &= ciu_en;
 			if (likely(ciu_sum))
 				do_IRQ(fls64(ciu_sum) + OCTEON_IRQ_WDOG0 - 1);
 			else
 				spurious_interrupt();
 		} else if (likely(cop0_cause)) {
 			do_IRQ(fls(cop0_cause) - 9 + MIPS_CPU_IRQ_BASE);
 		} else {
 			break;
 		}
 	}
 }
	/*
	* 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.
	*
	* Copyright (C) 2004-2008 Cavium Networks
	*/
	#include <linux/irq.h>
	#include <linux/interrupt.h>
	#include <linux/hardirq.h>

	#include <asm/octeon/octeon.h>

	DEFINE_RWLOCK(octeon_irq_ciu0_rwlock);
	DEFINE_RWLOCK(octeon_irq_ciu1_rwlock);
	DEFINE_SPINLOCK(octeon_irq_msi_lock);

	static void octeon_irq_core_ack(unsigned int irq)
	{
	unsigned int bit = irq - OCTEON_IRQ_SW0;
	/*
	* We don't need to disable IRQs to make these atomic since
	* they are already disabled earlier in the low level
	* interrupt code.
	*/
	clear_c0_status(0x100 << bit);
	/* The two user interrupts must be cleared manually. */
	if (bit < 2)
	clear_c0_cause(0x100 << bit);
	}

	static void octeon_irq_core_eoi(unsigned int irq)
	{
	struct irq_desc *desc = irq_desc + irq;
	unsigned int bit = irq - OCTEON_IRQ_SW0;
	/*
	* If an IRQ is being processed while we are disabling it the
	* handler will attempt to unmask the interrupt after it has
	* been disabled.
	*/
	if (desc->status & IRQ_DISABLED)
	return;

	/* There is a race here. We should fix it. */

	/*
	* We don't need to disable IRQs to make these atomic since
	* they are already disabled earlier in the low level
	* interrupt code.
	*/
	set_c0_status(0x100 << bit);
	}

	static void octeon_irq_core_enable(unsigned int irq)
	{
	unsigned long flags;
	unsigned int bit = irq - OCTEON_IRQ_SW0;

	/*
	* We need to disable interrupts to make sure our updates are
	* atomic.
	*/
	local_irq_save(flags);
	set_c0_status(0x100 << bit);
	local_irq_restore(flags);
	}

	static void octeon_irq_core_disable_local(unsigned int irq)
	{
	unsigned long flags;
	unsigned int bit = irq - OCTEON_IRQ_SW0;
	/*
	* We need to disable interrupts to make sure our updates are
	* atomic.
	*/
	local_irq_save(flags);
	clear_c0_status(0x100 << bit);
	local_irq_restore(flags);
	}

	static void octeon_irq_core_disable(unsigned int irq)
	{
	#ifdef CONFIG_SMP
	on_each_cpu((void ()(void )) octeon_irq_core_disable_local,
	(void *) (long) irq, 1);
	#else
	octeon_irq_core_disable_local(irq);
	#endif
	}

	static struct irq_chip octeon_irq_chip_core = {
	.name = "Core",
	.enable = octeon_irq_core_enable,
	.disable = octeon_irq_core_disable,
	.ack = octeon_irq_core_ack,
	.eoi = octeon_irq_core_eoi,
	};


	static void octeon_irq_ciu0_ack(unsigned int irq)
	{
	/*
	* In order to avoid any locking accessing the CIU, we
	* acknowledge CIU interrupts by disabling all of them. This
	* way we can use a per core register and avoid any out of
	* core locking requirements. This has the side affect that
	* CIU interrupts can't be processed recursively.
	*
	* We don't need to disable IRQs to make these atomic since
	* they are already disabled earlier in the low level
	* interrupt code.
	*/
	clear_c0_status(0x100 << 2);
	}

	static void octeon_irq_ciu0_eoi(unsigned int irq)
	{
	/*
	* Enable all CIU interrupts again. We don't need to disable
	* IRQs to make these atomic since they are already disabled
	* earlier in the low level interrupt code.
	*/
	set_c0_status(0x100 << 2);
	}

	static void octeon_irq_ciu0_enable(unsigned int irq)
	{
	int coreid = cvmx_get_core_num();
	unsigned long flags;
	uint64_t en0;
	int bit = irq - OCTEON_IRQ_WORKQ0; /* Bit 0-63 of EN0 */

	/*
	* A read lock is used here to make sure only one core is ever
	* updating the CIU enable bits at a time. During an enable
	* the cores don't interfere with each other. During a disable
	* the write lock stops any enables that might cause a
	* problem.
	*/
	read_lock_irqsave(&octeon_irq_ciu0_rwlock, flags);
	en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
	en0 \|= 1ull << bit;
	cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
	cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
	read_unlock_irqrestore(&octeon_irq_ciu0_rwlock, flags);
	}

	static void octeon_irq_ciu0_disable(unsigned int irq)
	{
	int bit = irq - OCTEON_IRQ_WORKQ0; /* Bit 0-63 of EN0 */
	unsigned long flags;
	uint64_t en0;
	#ifdef CONFIG_SMP
	int cpu;
	write_lock_irqsave(&octeon_irq_ciu0_rwlock, flags);
	for_each_online_cpu(cpu) {
	int coreid = cpu_logical_map(cpu);
	en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
	en0 &= ~(1ull << bit);
	cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
	}
	/*
	* We need to do a read after the last update to make sure all
	* of them are done.
	*/
	cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num() * 2));
	write_unlock_irqrestore(&octeon_irq_ciu0_rwlock, flags);
	#else
	int coreid = cvmx_get_core_num();
	local_irq_save(flags);
	en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
	en0 &= ~(1ull << bit);
	cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
	cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
	local_irq_restore(flags);
	#endif
	}

	#ifdef CONFIG_SMP
	static void octeon_irq_ciu0_set_affinity(unsigned int irq, const struct cpumask *dest)
	{
	int cpu;
	int bit = irq - OCTEON_IRQ_WORKQ0; /* Bit 0-63 of EN0 */

	write_lock(&octeon_irq_ciu0_rwlock);
	for_each_online_cpu(cpu) {
	int coreid = cpu_logical_map(cpu);
	uint64_t en0 =
	cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
	if (cpumask_test_cpu(cpu, dest))
	en0 \|= 1ull << bit;
	else
	en0 &= ~(1ull << bit);
	cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
	}
	/*
	* We need to do a read after the last update to make sure all
	* of them are done.
	*/
	cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num() * 2));
	write_unlock(&octeon_irq_ciu0_rwlock);
	}
	#endif

	static struct irq_chip octeon_irq_chip_ciu0 = {
	.name = "CIU0",
	.enable = octeon_irq_ciu0_enable,
	.disable = octeon_irq_ciu0_disable,
	.ack = octeon_irq_ciu0_ack,
	.eoi = octeon_irq_ciu0_eoi,
	#ifdef CONFIG_SMP
	.set_affinity = octeon_irq_ciu0_set_affinity,
	#endif
	};


	static void octeon_irq_ciu1_ack(unsigned int irq)
	{
	/*
	* In order to avoid any locking accessing the CIU, we
	* acknowledge CIU interrupts by disabling all of them. This
	* way we can use a per core register and avoid any out of
	* core locking requirements. This has the side affect that
	* CIU interrupts can't be processed recursively. We don't
	* need to disable IRQs to make these atomic since they are
	* already disabled earlier in the low level interrupt code.
	*/
	clear_c0_status(0x100 << 3);
	}

	static void octeon_irq_ciu1_eoi(unsigned int irq)
	{
	/*
	* Enable all CIU interrupts again. We don't need to disable
	* IRQs to make these atomic since they are already disabled
	* earlier in the low level interrupt code.
	*/
	set_c0_status(0x100 << 3);
	}

	static void octeon_irq_ciu1_enable(unsigned int irq)
	{
	int coreid = cvmx_get_core_num();
	unsigned long flags;
	uint64_t en1;
	int bit = irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */

	/*
	* A read lock is used here to make sure only one core is ever
	* updating the CIU enable bits at a time. During an enable
	* the cores don't interfere with each other. During a disable
	* the write lock stops any enables that might cause a
	* problem.
	*/
	read_lock_irqsave(&octeon_irq_ciu1_rwlock, flags);
	en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
	en1 \|= 1ull << bit;
	cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
	cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
	read_unlock_irqrestore(&octeon_irq_ciu1_rwlock, flags);
	}

	static void octeon_irq_ciu1_disable(unsigned int irq)
	{
	int bit = irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */
	unsigned long flags;
	uint64_t en1;
	#ifdef CONFIG_SMP
	int cpu;
	write_lock_irqsave(&octeon_irq_ciu1_rwlock, flags);
	for_each_online_cpu(cpu) {
	int coreid = cpu_logical_map(cpu);
	en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
	en1 &= ~(1ull << bit);
	cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
	}
	/*
	* We need to do a read after the last update to make sure all
	* of them are done.
	*/
	cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num() * 2 + 1));
	write_unlock_irqrestore(&octeon_irq_ciu1_rwlock, flags);
	#else
	int coreid = cvmx_get_core_num();
	local_irq_save(flags);
	en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
	en1 &= ~(1ull << bit);
	cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
	cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
	local_irq_restore(flags);
	#endif
	}

	#ifdef CONFIG_SMP
	static void octeon_irq_ciu1_set_affinity(unsigned int irq, const struct cpumask *dest)
	{
	int cpu;
	int bit = irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */

	write_lock(&octeon_irq_ciu1_rwlock);
	for_each_online_cpu(cpu) {
	int coreid = cpu_logical_map(cpu);
	uint64_t en1 =
	cvmx_read_csr(CVMX_CIU_INTX_EN1
	(coreid * 2 + 1));
	if (cpumask_test_cpu(cpu, dest))
	en1 \|= 1ull << bit;
	else
	en1 &= ~(1ull << bit);
	cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
	}
	/*
	* We need to do a read after the last update to make sure all
	* of them are done.
	*/
	cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num() * 2 + 1));
	write_unlock(&octeon_irq_ciu1_rwlock);
	}
	#endif

	static struct irq_chip octeon_irq_chip_ciu1 = {
	.name = "CIU1",
	.enable = octeon_irq_ciu1_enable,
	.disable = octeon_irq_ciu1_disable,
	.ack = octeon_irq_ciu1_ack,
	.eoi = octeon_irq_ciu1_eoi,
	#ifdef CONFIG_SMP
	.set_affinity = octeon_irq_ciu1_set_affinity,
	#endif
	};

	#ifdef CONFIG_PCI_MSI

	static void octeon_irq_msi_ack(unsigned int irq)
	{
	if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
	/* These chips have PCI */
	cvmx_write_csr(CVMX_NPI_NPI_MSI_RCV,
	1ull << (irq - OCTEON_IRQ_MSI_BIT0));
	} else {
	/*
	* These chips have PCIe. Thankfully the ACK doesn't
	* need any locking.
	*/
	cvmx_write_csr(CVMX_PEXP_NPEI_MSI_RCV0,
	1ull << (irq - OCTEON_IRQ_MSI_BIT0));
	}
	}

	static void octeon_irq_msi_eoi(unsigned int irq)
	{
	/* Nothing needed */
	}

	static void octeon_irq_msi_enable(unsigned int irq)
	{
	if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
	/*
	* Octeon PCI doesn't have the ability to mask/unmask
	* MSI interrupts individually. Instead of
	* masking/unmasking them in groups of 16, we simple
	* assume MSI devices are well behaved. MSI
	* interrupts are always enable and the ACK is assumed
	* to be enough.
	*/
	} else {
	/* These chips have PCIe. Note that we only support
	* the first 64 MSI interrupts. Unfortunately all the
	* MSI enables are in the same register. We use
	* MSI0's lock to control access to them all.
	*/
	uint64_t en;
	unsigned long flags;
	spin_lock_irqsave(&octeon_irq_msi_lock, flags);
	en = cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
	en \|= 1ull << (irq - OCTEON_IRQ_MSI_BIT0);
	cvmx_write_csr(CVMX_PEXP_NPEI_MSI_ENB0, en);
	cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
	spin_unlock_irqrestore(&octeon_irq_msi_lock, flags);
	}
	}

	static void octeon_irq_msi_disable(unsigned int irq)
	{
	if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
	/* See comment in enable */
	} else {
	/*
	* These chips have PCIe. Note that we only support
	* the first 64 MSI interrupts. Unfortunately all the
	* MSI enables are in the same register. We use
	* MSI0's lock to control access to them all.
	*/
	uint64_t en;
	unsigned long flags;
	spin_lock_irqsave(&octeon_irq_msi_lock, flags);
	en = cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
	en &= ~(1ull << (irq - OCTEON_IRQ_MSI_BIT0));
	cvmx_write_csr(CVMX_PEXP_NPEI_MSI_ENB0, en);
	cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
	spin_unlock_irqrestore(&octeon_irq_msi_lock, flags);
	}
	}

	static struct irq_chip octeon_irq_chip_msi = {
	.name = "MSI",
	.enable = octeon_irq_msi_enable,
	.disable = octeon_irq_msi_disable,
	.ack = octeon_irq_msi_ack,
	.eoi = octeon_irq_msi_eoi,
	};
	#endif

	void __init arch_init_irq(void)
	{
	int irq;

	#ifdef CONFIG_SMP
	/* Set the default affinity to the boot cpu. */
	cpumask_clear(irq_default_affinity);
	cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
	#endif

	if (NR_IRQS < OCTEON_IRQ_LAST)
	pr_err("octeon_irq_init: NR_IRQS is set too low\n");

	/* 0 - 15 reserved for i8259 master and slave controller. */

	/* 17 - 23 Mips internal */
	for (irq = OCTEON_IRQ_SW0; irq <= OCTEON_IRQ_TIMER; irq++) {
	set_irq_chip_and_handler(irq, &octeon_irq_chip_core,
	handle_percpu_irq);
	}

	/* 24 - 87 CIU_INT_SUM0 */
	for (irq = OCTEON_IRQ_WORKQ0; irq <= OCTEON_IRQ_BOOTDMA; irq++) {
	set_irq_chip_and_handler(irq, &octeon_irq_chip_ciu0,
	handle_percpu_irq);
	}

	/* 88 - 151 CIU_INT_SUM1 */
	for (irq = OCTEON_IRQ_WDOG0; irq <= OCTEON_IRQ_RESERVED151; irq++) {
	set_irq_chip_and_handler(irq, &octeon_irq_chip_ciu1,
	handle_percpu_irq);
	}

	#ifdef CONFIG_PCI_MSI
	/* 152 - 215 PCI/PCIe MSI interrupts */
	for (irq = OCTEON_IRQ_MSI_BIT0; irq <= OCTEON_IRQ_MSI_BIT63; irq++) {
	set_irq_chip_and_handler(irq, &octeon_irq_chip_msi,
	handle_percpu_irq);
	}
	#endif
	set_c0_status(0x300 << 2);
	}

	asmlinkage void plat_irq_dispatch(void)
	{
	const unsigned long core_id = cvmx_get_core_num();
	const uint64_t ciu_sum0_address = CVMX_CIU_INTX_SUM0(core_id * 2);
	const uint64_t ciu_en0_address = CVMX_CIU_INTX_EN0(core_id * 2);
	const uint64_t ciu_sum1_address = CVMX_CIU_INT_SUM1;
	const uint64_t ciu_en1_address = CVMX_CIU_INTX_EN1(core_id * 2 + 1);
	unsigned long cop0_cause;
	unsigned long cop0_status;
	uint64_t ciu_en;
	uint64_t ciu_sum;

	while (1) {
	cop0_cause = read_c0_cause();
	cop0_status = read_c0_status();
	cop0_cause &= cop0_status;
	cop0_cause &= ST0_IM;

	if (unlikely(cop0_cause & STATUSF_IP2)) {
	ciu_sum = cvmx_read_csr(ciu_sum0_address);
	ciu_en = cvmx_read_csr(ciu_en0_address);
	ciu_sum &= ciu_en;
	if (likely(ciu_sum))
	do_IRQ(fls64(ciu_sum) + OCTEON_IRQ_WORKQ0 - 1);
	else
	spurious_interrupt();
	} else if (unlikely(cop0_cause & STATUSF_IP3)) {
	ciu_sum = cvmx_read_csr(ciu_sum1_address);
	ciu_en = cvmx_read_csr(ciu_en1_address);
	ciu_sum &= ciu_en;
	if (likely(ciu_sum))
	do_IRQ(fls64(ciu_sum) + OCTEON_IRQ_WDOG0 - 1);
	else
	spurious_interrupt();
	} else if (likely(cop0_cause)) {
	do_IRQ(fls(cop0_cause) - 9 + MIPS_CPU_IRQ_BASE);
	} else {
	break;
	}
	}
	}