drivers/irqchip/irq-armada-370-xp.c - kernel/common - Git at Google

 /*
  * Marvell Armada 370 and Armada XP SoC IRQ handling
  *
  * Copyright (C) 2012 Marvell
  *
  * Lior Amsalem <[email protected]>
  * Gregory CLEMENT <[email protected]>
  * Thomas Petazzoni <[email protected]>
  * Ben Dooks <[email protected]>
  *
  * This file is licensed under the terms of the GNU General Public
  * License version 2.  This program is licensed "as is" without any
  * warranty of any kind, whether express or implied.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/irqdomain.h>
 #include <asm/mach/arch.h>
 #include <asm/exception.h>
 #include <asm/smp_plat.h>
 #include <asm/mach/irq.h>

 #include "irqchip.h"

 /* Interrupt Controller Registers Map */
 #define ARMADA_370_XP_INT_SET_MASK_OFFS		(0x48)
 #define ARMADA_370_XP_INT_CLEAR_MASK_OFFS	(0x4C)

 #define ARMADA_370_XP_INT_CONTROL		(0x00)
 #define ARMADA_370_XP_INT_SET_ENABLE_OFFS	(0x30)
 #define ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS	(0x34)
 #define ARMADA_370_XP_INT_SOURCE_CTL(irq)	(0x100 + irq*4)

 #define ARMADA_370_XP_CPU_INTACK_OFFS		(0x44)

 #define ARMADA_370_XP_SW_TRIG_INT_OFFS           (0x4)
 #define ARMADA_370_XP_IN_DRBEL_MSK_OFFS          (0xc)
 #define ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS        (0x8)

 #define ARMADA_370_XP_MAX_PER_CPU_IRQS		(28)

 #define ARMADA_370_XP_TIMER0_PER_CPU_IRQ	(5)

 #define IPI_DOORBELL_START                      (0)
 #define IPI_DOORBELL_END                        (8)
 #define IPI_DOORBELL_MASK                       0xFF

 static DEFINE_RAW_SPINLOCK(irq_controller_lock);

 static void __iomem *per_cpu_int_base;
 static void __iomem *main_int_base;
 static struct irq_domain *armada_370_xp_mpic_domain;

 /*
  * In SMP mode:
  * For shared global interrupts, mask/unmask global enable bit
  * For CPU interrupts, mask/unmask the calling CPU's bit
  */
 static void armada_370_xp_irq_mask(struct irq_data *d)
 {
 	irq_hw_number_t hwirq = irqd_to_hwirq(d);

 	if (hwirq != ARMADA_370_XP_TIMER0_PER_CPU_IRQ)
 		writel(hwirq, main_int_base +
 				ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS);
 	else
 		writel(hwirq, per_cpu_int_base +
 				ARMADA_370_XP_INT_SET_MASK_OFFS);
 }

 static void armada_370_xp_irq_unmask(struct irq_data *d)
 {
 	irq_hw_number_t hwirq = irqd_to_hwirq(d);

 	if (hwirq != ARMADA_370_XP_TIMER0_PER_CPU_IRQ)
 		writel(hwirq, main_int_base +
 				ARMADA_370_XP_INT_SET_ENABLE_OFFS);
 	else
 		writel(hwirq, per_cpu_int_base +
 				ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
 }

 #ifdef CONFIG_SMP
 static int armada_xp_set_affinity(struct irq_data *d,
 				  const struct cpumask *mask_val, bool force)
 {
 	unsigned long reg;
 	unsigned long new_mask = 0;
 	unsigned long online_mask = 0;
 	unsigned long count = 0;
 	irq_hw_number_t hwirq = irqd_to_hwirq(d);
 	int cpu;

 	for_each_cpu(cpu, mask_val) {
 		new_mask |= 1 << cpu_logical_map(cpu);
 		count++;
 	}

 	/*
 	 * Forbid mutlicore interrupt affinity
 	 * This is required since the MPIC HW doesn't limit
 	 * several CPUs from acknowledging the same interrupt.
 	 */
 	if (count > 1)
 		return -EINVAL;

 	for_each_cpu(cpu, cpu_online_mask)
 		online_mask |= 1 << cpu_logical_map(cpu);

 	raw_spin_lock(&irq_controller_lock);

 	reg = readl(main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));
 	reg = (reg & (~online_mask)) | new_mask;
 	writel(reg, main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));

 	raw_spin_unlock(&irq_controller_lock);

 	return 0;
 }
 #endif

 static struct irq_chip armada_370_xp_irq_chip = {
 	.name		= "armada_370_xp_irq",
 	.irq_mask       = armada_370_xp_irq_mask,
 	.irq_mask_ack   = armada_370_xp_irq_mask,
 	.irq_unmask     = armada_370_xp_irq_unmask,
 #ifdef CONFIG_SMP
 	.irq_set_affinity = armada_xp_set_affinity,
 #endif
 };

 static int armada_370_xp_mpic_irq_map(struct irq_domain *h,
 				      unsigned int virq, irq_hw_number_t hw)
 {
 	armada_370_xp_irq_mask(irq_get_irq_data(virq));
 	if (hw != ARMADA_370_XP_TIMER0_PER_CPU_IRQ)
 		writel(hw, per_cpu_int_base +
 			ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
 	else
 		writel(hw, main_int_base + ARMADA_370_XP_INT_SET_ENABLE_OFFS);
 	irq_set_status_flags(virq, IRQ_LEVEL);

 	if (hw == ARMADA_370_XP_TIMER0_PER_CPU_IRQ) {
 		irq_set_percpu_devid(virq);
 		irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip,
 					handle_percpu_devid_irq);

 	} else {
 		irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip,
 					handle_level_irq);
 	}
 	set_irq_flags(virq, IRQF_VALID | IRQF_PROBE);

 	return 0;
 }

 #ifdef CONFIG_SMP
 void armada_mpic_send_doorbell(const struct cpumask *mask, unsigned int irq)
 {
 	int cpu;
 	unsigned long map = 0;

 	/* Convert our logical CPU mask into a physical one. */
 	for_each_cpu(cpu, mask)
 		map |= 1 << cpu_logical_map(cpu);

 	/*
 	 * Ensure that stores to Normal memory are visible to the
 	 * other CPUs before issuing the IPI.
 	 */
 	dsb();

 	/* submit softirq */
 	writel((map << 8) | irq, main_int_base +
 		ARMADA_370_XP_SW_TRIG_INT_OFFS);
 }

 void armada_xp_mpic_smp_cpu_init(void)
 {
 	/* Clear pending IPIs */
 	writel(0, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);

 	/* Enable first 8 IPIs */
 	writel(IPI_DOORBELL_MASK, per_cpu_int_base +
 		ARMADA_370_XP_IN_DRBEL_MSK_OFFS);

 	/* Unmask IPI interrupt */
 	writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
 }
 #endif /* CONFIG_SMP */

 static struct irq_domain_ops armada_370_xp_mpic_irq_ops = {
 	.map = armada_370_xp_mpic_irq_map,
 	.xlate = irq_domain_xlate_onecell,
 };

 static asmlinkage void __exception_irq_entry
 armada_370_xp_handle_irq(struct pt_regs *regs)
 {
 	u32 irqstat, irqnr;

 	do {
 		irqstat = readl_relaxed(per_cpu_int_base +
 					ARMADA_370_XP_CPU_INTACK_OFFS);
 		irqnr = irqstat & 0x3FF;

 		if (irqnr > 1022)
 			break;

 		if (irqnr > 0) {
 			irqnr =	irq_find_mapping(armada_370_xp_mpic_domain,
 					irqnr);
 			handle_IRQ(irqnr, regs);
 			continue;
 		}
 #ifdef CONFIG_SMP
 		/* IPI Handling */
 		if (irqnr == 0) {
 			u32 ipimask, ipinr;

 			ipimask = readl_relaxed(per_cpu_int_base +
 						ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS)
 				& IPI_DOORBELL_MASK;

 			writel(~IPI_DOORBELL_MASK, per_cpu_int_base +
 				ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);

 			/* Handle all pending doorbells */
 			for (ipinr = IPI_DOORBELL_START;
 			     ipinr < IPI_DOORBELL_END; ipinr++) {
 				if (ipimask & (0x1 << ipinr))
 					handle_IPI(ipinr, regs);
 			}
 			continue;
 		}
 #endif

 	} while (1);
 }

 static int __init armada_370_xp_mpic_of_init(struct device_node *node,
 					     struct device_node *parent)
 {
 	u32 control;

 	main_int_base = of_iomap(node, 0);
 	per_cpu_int_base = of_iomap(node, 1);

 	BUG_ON(!main_int_base);
 	BUG_ON(!per_cpu_int_base);

 	control = readl(main_int_base + ARMADA_370_XP_INT_CONTROL);

 	armada_370_xp_mpic_domain =
 		irq_domain_add_linear(node, (control >> 2) & 0x3ff,
 				&armada_370_xp_mpic_irq_ops, NULL);

 	if (!armada_370_xp_mpic_domain)
 		panic("Unable to add Armada_370_Xp MPIC irq domain (DT)\n");

 	irq_set_default_host(armada_370_xp_mpic_domain);

 #ifdef CONFIG_SMP
 	armada_xp_mpic_smp_cpu_init();

 	/*
 	 * Set the default affinity from all CPUs to the boot cpu.
 	 * This is required since the MPIC doesn't limit several CPUs
 	 * from acknowledging the same interrupt.
 	 */
 	cpumask_clear(irq_default_affinity);
 	cpumask_set_cpu(smp_processor_id(), irq_default_affinity);

 #endif

 	set_handle_irq(armada_370_xp_handle_irq);

 	return 0;
 }

 IRQCHIP_DECLARE(armada_370_xp_mpic, "marvell,mpic", armada_370_xp_mpic_of_init);
	/*
	* Marvell Armada 370 and Armada XP SoC IRQ handling
	*
	* Copyright (C) 2012 Marvell
	*
	* Lior Amsalem <[email protected]>
	* Gregory CLEMENT <[email protected]>
	* Thomas Petazzoni <[email protected]>
	* Ben Dooks <[email protected]>
	*
	* This file is licensed under the terms of the GNU General Public
	* License version 2. This program is licensed "as is" without any
	* warranty of any kind, whether express or implied.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/irq.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/of_address.h>
	#include <linux/of_irq.h>
	#include <linux/irqdomain.h>
	#include <asm/mach/arch.h>
	#include <asm/exception.h>
	#include <asm/smp_plat.h>
	#include <asm/mach/irq.h>

	#include "irqchip.h"

	/* Interrupt Controller Registers Map */
	#define ARMADA_370_XP_INT_SET_MASK_OFFS (0x48)
	#define ARMADA_370_XP_INT_CLEAR_MASK_OFFS (0x4C)

	#define ARMADA_370_XP_INT_CONTROL (0x00)
	#define ARMADA_370_XP_INT_SET_ENABLE_OFFS (0x30)
	#define ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS (0x34)
	#define ARMADA_370_XP_INT_SOURCE_CTL(irq) (0x100 + irq*4)

	#define ARMADA_370_XP_CPU_INTACK_OFFS (0x44)

	#define ARMADA_370_XP_SW_TRIG_INT_OFFS (0x4)
	#define ARMADA_370_XP_IN_DRBEL_MSK_OFFS (0xc)
	#define ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS (0x8)

	#define ARMADA_370_XP_MAX_PER_CPU_IRQS (28)

	#define ARMADA_370_XP_TIMER0_PER_CPU_IRQ (5)

	#define IPI_DOORBELL_START (0)
	#define IPI_DOORBELL_END (8)
	#define IPI_DOORBELL_MASK 0xFF

	static DEFINE_RAW_SPINLOCK(irq_controller_lock);

	static void __iomem *per_cpu_int_base;
	static void __iomem *main_int_base;
	static struct irq_domain *armada_370_xp_mpic_domain;

	/*
	* In SMP mode:
	* For shared global interrupts, mask/unmask global enable bit
	* For CPU interrupts, mask/unmask the calling CPU's bit
	*/
	static void armada_370_xp_irq_mask(struct irq_data *d)
	{
	irq_hw_number_t hwirq = irqd_to_hwirq(d);

	if (hwirq != ARMADA_370_XP_TIMER0_PER_CPU_IRQ)
	writel(hwirq, main_int_base +
	ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS);
	else
	writel(hwirq, per_cpu_int_base +
	ARMADA_370_XP_INT_SET_MASK_OFFS);
	}

	static void armada_370_xp_irq_unmask(struct irq_data *d)
	{
	irq_hw_number_t hwirq = irqd_to_hwirq(d);

	if (hwirq != ARMADA_370_XP_TIMER0_PER_CPU_IRQ)
	writel(hwirq, main_int_base +
	ARMADA_370_XP_INT_SET_ENABLE_OFFS);
	else
	writel(hwirq, per_cpu_int_base +
	ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
	}

	#ifdef CONFIG_SMP
	static int armada_xp_set_affinity(struct irq_data *d,
	const struct cpumask *mask_val, bool force)
	{
	unsigned long reg;
	unsigned long new_mask = 0;
	unsigned long online_mask = 0;
	unsigned long count = 0;
	irq_hw_number_t hwirq = irqd_to_hwirq(d);
	int cpu;

	for_each_cpu(cpu, mask_val) {
	new_mask \|= 1 << cpu_logical_map(cpu);
	count++;
	}

	/*
	* Forbid mutlicore interrupt affinity
	* This is required since the MPIC HW doesn't limit
	* several CPUs from acknowledging the same interrupt.
	*/
	if (count > 1)
	return -EINVAL;

	for_each_cpu(cpu, cpu_online_mask)
	online_mask \|= 1 << cpu_logical_map(cpu);

	raw_spin_lock(&irq_controller_lock);

	reg = readl(main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));
	reg = (reg & (~online_mask)) \| new_mask;
	writel(reg, main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));

	raw_spin_unlock(&irq_controller_lock);

	return 0;
	}
	#endif

	static struct irq_chip armada_370_xp_irq_chip = {
	.name = "armada_370_xp_irq",
	.irq_mask = armada_370_xp_irq_mask,
	.irq_mask_ack = armada_370_xp_irq_mask,
	.irq_unmask = armada_370_xp_irq_unmask,
	#ifdef CONFIG_SMP
	.irq_set_affinity = armada_xp_set_affinity,
	#endif
	};

	static int armada_370_xp_mpic_irq_map(struct irq_domain *h,
	unsigned int virq, irq_hw_number_t hw)
	{
	armada_370_xp_irq_mask(irq_get_irq_data(virq));
	if (hw != ARMADA_370_XP_TIMER0_PER_CPU_IRQ)
	writel(hw, per_cpu_int_base +
	ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
	else
	writel(hw, main_int_base + ARMADA_370_XP_INT_SET_ENABLE_OFFS);
	irq_set_status_flags(virq, IRQ_LEVEL);

	if (hw == ARMADA_370_XP_TIMER0_PER_CPU_IRQ) {
	irq_set_percpu_devid(virq);
	irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip,
	handle_percpu_devid_irq);

	} else {
	irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip,
	handle_level_irq);
	}
	set_irq_flags(virq, IRQF_VALID \| IRQF_PROBE);

	return 0;
	}

	#ifdef CONFIG_SMP
	void armada_mpic_send_doorbell(const struct cpumask *mask, unsigned int irq)
	{
	int cpu;
	unsigned long map = 0;

	/* Convert our logical CPU mask into a physical one. */
	for_each_cpu(cpu, mask)
	map \|= 1 << cpu_logical_map(cpu);

	/*
	* Ensure that stores to Normal memory are visible to the
	* other CPUs before issuing the IPI.
	*/
	dsb();

	/* submit softirq */
	writel((map << 8) \| irq, main_int_base +
	ARMADA_370_XP_SW_TRIG_INT_OFFS);
	}

	void armada_xp_mpic_smp_cpu_init(void)
	{
	/* Clear pending IPIs */
	writel(0, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);

	/* Enable first 8 IPIs */
	writel(IPI_DOORBELL_MASK, per_cpu_int_base +
	ARMADA_370_XP_IN_DRBEL_MSK_OFFS);

	/* Unmask IPI interrupt */
	writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
	}
	#endif /* CONFIG_SMP */

	static struct irq_domain_ops armada_370_xp_mpic_irq_ops = {
	.map = armada_370_xp_mpic_irq_map,
	.xlate = irq_domain_xlate_onecell,
	};

	static asmlinkage void __exception_irq_entry
	armada_370_xp_handle_irq(struct pt_regs *regs)
	{
	u32 irqstat, irqnr;

	do {
	irqstat = readl_relaxed(per_cpu_int_base +
	ARMADA_370_XP_CPU_INTACK_OFFS);
	irqnr = irqstat & 0x3FF;

	if (irqnr > 1022)
	break;

	if (irqnr > 0) {
	irqnr = irq_find_mapping(armada_370_xp_mpic_domain,
	irqnr);
	handle_IRQ(irqnr, regs);
	continue;
	}
	#ifdef CONFIG_SMP
	/* IPI Handling */
	if (irqnr == 0) {
	u32 ipimask, ipinr;

	ipimask = readl_relaxed(per_cpu_int_base +
	ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS)
	& IPI_DOORBELL_MASK;

	writel(~IPI_DOORBELL_MASK, per_cpu_int_base +
	ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);

	/* Handle all pending doorbells */
	for (ipinr = IPI_DOORBELL_START;
	ipinr < IPI_DOORBELL_END; ipinr++) {
	if (ipimask & (0x1 << ipinr))
	handle_IPI(ipinr, regs);
	}
	continue;
	}
	#endif

	} while (1);
	}

	static int __init armada_370_xp_mpic_of_init(struct device_node *node,
	struct device_node *parent)
	{
	u32 control;

	main_int_base = of_iomap(node, 0);
	per_cpu_int_base = of_iomap(node, 1);

	BUG_ON(!main_int_base);
	BUG_ON(!per_cpu_int_base);

	control = readl(main_int_base + ARMADA_370_XP_INT_CONTROL);

	armada_370_xp_mpic_domain =
	irq_domain_add_linear(node, (control >> 2) & 0x3ff,
	&armada_370_xp_mpic_irq_ops, NULL);

	if (!armada_370_xp_mpic_domain)
	panic("Unable to add Armada_370_Xp MPIC irq domain (DT)\n");

	irq_set_default_host(armada_370_xp_mpic_domain);

	#ifdef CONFIG_SMP
	armada_xp_mpic_smp_cpu_init();

	/*
	* Set the default affinity from all CPUs to the boot cpu.
	* This is required since the MPIC doesn't limit several CPUs
	* from acknowledging the same interrupt.
	*/
	cpumask_clear(irq_default_affinity);
	cpumask_set_cpu(smp_processor_id(), irq_default_affinity);

	#endif

	set_handle_irq(armada_370_xp_handle_irq);

	return 0;
	}

	IRQCHIP_DECLARE(armada_370_xp_mpic, "marvell,mpic", armada_370_xp_mpic_of_init);