/*
 * Marvell Armada 370 and Armada XP SoC IRQ handling
 *
 * Copyright (C) 2012 Marvell
 *
 * Lior Amsalem <alior@marvell.com>
 * Gregory CLEMENT <gregory.clement@free-electrons.com>
 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
 * Ben Dooks <ben.dooks@codethink.co.uk>
 *
 * 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/irqchip.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/cpu.h>
#include <linux/io.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_pci.h>
#include <linux/irqdomain.h>
#include <linux/slab.h>
#include <linux/syscore_ops.h>
#include <linux/msi.h>
#include <asm/mach/arch.h>
#include <asm/exception.h>
#include <asm/smp_plat.h>
#include <asm/mach/irq.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_FABRIC_MASK_OFFS	(0x54)
#define ARMADA_370_XP_INT_CAUSE_PERF(cpu)	(1 << cpu)

#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_INT_SOURCE_CPU_MASK	0xF
#define ARMADA_370_XP_INT_IRQ_FIQ_MASK(cpuid)	((BIT(0) | BIT(8)) << cpuid)

#define ARMADA_370_XP_CPU_INTACK_OFFS		(0x44)
#define ARMADA_375_PPI_CAUSE			(0x10)

#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 IPI_DOORBELL_START                      (0)
#define IPI_DOORBELL_END                        (8)
#define IPI_DOORBELL_MASK                       0xFF
#define PCI_MSI_DOORBELL_START                  (16)
#define PCI_MSI_DOORBELL_NR                     (16)
#define PCI_MSI_DOORBELL_END                    (32)
#define PCI_MSI_DOORBELL_MASK                   0xFFFF0000

static void __iomem *per_cpu_int_base;
static void __iomem *main_int_base;
static struct irq_domain *armada_370_xp_mpic_domain;
static u32 doorbell_mask_reg;
static int parent_irq;
#ifdef CONFIG_PCI_MSI
static struct irq_domain *armada_370_xp_msi_domain;
static struct irq_domain *armada_370_xp_msi_inner_domain;
static DECLARE_BITMAP(msi_used, PCI_MSI_DOORBELL_NR);
static DEFINE_MUTEX(msi_used_lock);
static phys_addr_t msi_doorbell_addr;
#endif

static inline bool is_percpu_irq(irq_hw_number_t irq)
{
	if (irq <= ARMADA_370_XP_MAX_PER_CPU_IRQS)
		return true;

	return false;
}

/*
 * 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 (!is_percpu_irq(hwirq))
		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 (!is_percpu_irq(hwirq))
		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_PCI_MSI

static struct irq_chip armada_370_xp_msi_irq_chip = {
	.name = "MPIC MSI",
	.irq_mask = pci_msi_mask_irq,
	.irq_unmask = pci_msi_unmask_irq,
};

static struct msi_domain_info armada_370_xp_msi_domain_info = {
	.flags	= (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
		   MSI_FLAG_MULTI_PCI_MSI),
	.chip	= &armada_370_xp_msi_irq_chip,
};

static void armada_370_xp_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
{
	msg->address_lo = lower_32_bits(msi_doorbell_addr);
	msg->address_hi = upper_32_bits(msi_doorbell_addr);
	msg->data = 0xf00 | (data->hwirq + PCI_MSI_DOORBELL_START);
}

static int armada_370_xp_msi_set_affinity(struct irq_data *irq_data,
					  const struct cpumask *mask, bool force)
{
	 return -EINVAL;
}

static struct irq_chip armada_370_xp_msi_bottom_irq_chip = {
	.name			= "MPIC MSI",
	.irq_compose_msi_msg	= armada_370_xp_compose_msi_msg,
	.irq_set_affinity	= armada_370_xp_msi_set_affinity,
};

static int armada_370_xp_msi_alloc(struct irq_domain *domain, unsigned int virq,
				   unsigned int nr_irqs, void *args)
{
	int hwirq, i;

	mutex_lock(&msi_used_lock);

	hwirq = bitmap_find_next_zero_area(msi_used, PCI_MSI_DOORBELL_NR,
					   0, nr_irqs, 0);
	if (hwirq >= PCI_MSI_DOORBELL_NR) {
		mutex_unlock(&msi_used_lock);
		return -ENOSPC;
	}

	bitmap_set(msi_used, hwirq, nr_irqs);
	mutex_unlock(&msi_used_lock);

	for (i = 0; i < nr_irqs; i++) {
		irq_domain_set_info(domain, virq + i, hwirq + i,
				    &armada_370_xp_msi_bottom_irq_chip,
				    domain->host_data, handle_simple_irq,
				    NULL, NULL);
	}

	return hwirq;
}

static void armada_370_xp_msi_free(struct irq_domain *domain,
				   unsigned int virq, unsigned int nr_irqs)
{
	struct irq_data *d = irq_domain_get_irq_data(domain, virq);

	mutex_lock(&msi_used_lock);
	bitmap_clear(msi_used, d->hwirq, nr_irqs);
	mutex_unlock(&msi_used_lock);
}

static const struct irq_domain_ops armada_370_xp_msi_domain_ops = {
	.alloc	= armada_370_xp_msi_alloc,
	.free	= armada_370_xp_msi_free,
};

static int armada_370_xp_msi_init(struct device_node *node,
				  phys_addr_t main_int_phys_base)
{
	u32 reg;

	msi_doorbell_addr = main_int_phys_base +
		ARMADA_370_XP_SW_TRIG_INT_OFFS;

	armada_370_xp_msi_inner_domain =
		irq_domain_add_linear(NULL, PCI_MSI_DOORBELL_NR,
				      &armada_370_xp_msi_domain_ops, NULL);
	if (!armada_370_xp_msi_inner_domain)
		return -ENOMEM;

	armada_370_xp_msi_domain =
		pci_msi_create_irq_domain(of_node_to_fwnode(node),
					  &armada_370_xp_msi_domain_info,
					  armada_370_xp_msi_inner_domain);
	if (!armada_370_xp_msi_domain) {
		irq_domain_remove(armada_370_xp_msi_inner_domain);
		return -ENOMEM;
	}

	reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS)
		| PCI_MSI_DOORBELL_MASK;

	writel(reg, per_cpu_int_base +
	       ARMADA_370_XP_IN_DRBEL_MSK_OFFS);

	/* Unmask IPI interrupt */
	writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);

	return 0;
}
#else
static inline int armada_370_xp_msi_init(struct device_node *node,
					 phys_addr_t main_int_phys_base)
{
	return 0;
}
#endif

#ifdef CONFIG_SMP
static DEFINE_RAW_SPINLOCK(irq_controller_lock);

static int armada_xp_set_affinity(struct irq_data *d,
				  const struct cpumask *mask_val, bool force)
{
	irq_hw_number_t hwirq = irqd_to_hwirq(d);
	unsigned long reg, mask;
	int cpu;

	/* Select a single core from the affinity mask which is online */
	cpu = cpumask_any_and(mask_val, cpu_online_mask);
	mask = 1UL << cpu_logical_map(cpu);

	raw_spin_lock(&irq_controller_lock);
	reg = readl(main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));
	reg = (reg & (~ARMADA_370_XP_INT_SOURCE_CPU_MASK)) | mask;
	writel(reg, main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));
	raw_spin_unlock(&irq_controller_lock);

	return IRQ_SET_MASK_OK;
}
#endif

static struct irq_chip armada_370_xp_irq_chip = {
	.name		= "MPIC",
	.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
	.flags		= IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND,
};

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 (!is_percpu_irq(hw))
		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 (is_percpu_irq(hw)) {
		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);
	}
	irq_set_probe(virq);
	irq_clear_status_flags(virq, IRQ_NOAUTOEN);

	return 0;
}

static void armada_xp_mpic_smp_cpu_init(void)
{
	u32 control;
	int nr_irqs, i;

	control = readl(main_int_base + ARMADA_370_XP_INT_CONTROL);
	nr_irqs = (control >> 2) & 0x3ff;

	for (i = 0; i < nr_irqs; i++)
		writel(i, per_cpu_int_base + ARMADA_370_XP_INT_SET_MASK_OFFS);

	/* 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);
}

static void armada_xp_mpic_perf_init(void)
{
	unsigned long cpuid = cpu_logical_map(smp_processor_id());

	/* Enable Performance Counter Overflow interrupts */
	writel(ARMADA_370_XP_INT_CAUSE_PERF(cpuid),
	       per_cpu_int_base + ARMADA_370_XP_INT_FABRIC_MASK_OFFS);
}

#ifdef CONFIG_SMP
static 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);
}

static int armada_xp_mpic_starting_cpu(unsigned int cpu)
{
	armada_xp_mpic_perf_init();
	armada_xp_mpic_smp_cpu_init();
	return 0;
}

static int mpic_cascaded_starting_cpu(unsigned int cpu)
{
	armada_xp_mpic_perf_init();
	enable_percpu_irq(parent_irq, IRQ_TYPE_NONE);
	return 0;
}
#endif

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

#ifdef CONFIG_PCI_MSI
static void armada_370_xp_handle_msi_irq(struct pt_regs *regs, bool is_chained)
{
	u32 msimask, msinr;

	msimask = readl_relaxed(per_cpu_int_base +
				ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS)
		& PCI_MSI_DOORBELL_MASK;

	writel(~msimask, per_cpu_int_base +
	       ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);

	for (msinr = PCI_MSI_DOORBELL_START;
	     msinr < PCI_MSI_DOORBELL_END; msinr++) {
		int irq;

		if (!(msimask & BIT(msinr)))
			continue;

		if (is_chained) {
			irq = irq_find_mapping(armada_370_xp_msi_inner_domain,
					       msinr - PCI_MSI_DOORBELL_START);
			generic_handle_irq(irq);
		} else {
			irq = msinr - PCI_MSI_DOORBELL_START;
			handle_domain_irq(armada_370_xp_msi_inner_domain,
					  irq, regs);
		}
	}
}
#else
static void armada_370_xp_handle_msi_irq(struct pt_regs *r, bool b) {}
#endif

static void armada_370_xp_mpic_handle_cascade_irq(struct irq_desc *desc)
{
	struct irq_chip *chip = irq_desc_get_chip(desc);
	unsigned long irqmap, irqn, irqsrc, cpuid;
	unsigned int cascade_irq;

	chained_irq_enter(chip, desc);

	irqmap = readl_relaxed(per_cpu_int_base + ARMADA_375_PPI_CAUSE);
	cpuid = cpu_logical_map(smp_processor_id());

	for_each_set_bit(irqn, &irqmap, BITS_PER_LONG) {
		irqsrc = readl_relaxed(main_int_base +
				       ARMADA_370_XP_INT_SOURCE_CTL(irqn));

		/* Check if the interrupt is not masked on current CPU.
		 * Test IRQ (0-1) and FIQ (8-9) mask bits.
		 */
		if (!(irqsrc & ARMADA_370_XP_INT_IRQ_FIQ_MASK(cpuid)))
			continue;

		if (irqn == 1) {
			armada_370_xp_handle_msi_irq(NULL, true);
			continue;
		}

		cascade_irq = irq_find_mapping(armada_370_xp_mpic_domain, irqn);
		generic_handle_irq(cascade_irq);
	}

	chained_irq_exit(chip, desc);
}

static 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 > 1) {
			handle_domain_irq(armada_370_xp_mpic_domain,
					  irqnr, regs);
			continue;
		}

		/* MSI handling */
		if (irqnr == 1)
			armada_370_xp_handle_msi_irq(regs, false);

#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(~ipimask, 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 armada_370_xp_mpic_suspend(void)
{
	doorbell_mask_reg = readl(per_cpu_int_base +
				  ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
	return 0;
}

static void armada_370_xp_mpic_resume(void)
{
	int nirqs;
	irq_hw_number_t irq;

	/* Re-enable interrupts */
	nirqs = (readl(main_int_base + ARMADA_370_XP_INT_CONTROL) >> 2) & 0x3ff;
	for (irq = 0; irq < nirqs; irq++) {
		struct irq_data *data;
		int virq;

		virq = irq_linear_revmap(armada_370_xp_mpic_domain, irq);
		if (virq == 0)
			continue;

		if (!is_percpu_irq(irq))
			writel(irq, per_cpu_int_base +
			       ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
		else
			writel(irq, main_int_base +
			       ARMADA_370_XP_INT_SET_ENABLE_OFFS);

		data = irq_get_irq_data(virq);
		if (!irqd_irq_disabled(data))
			armada_370_xp_irq_unmask(data);
	}

	/* Reconfigure doorbells for IPIs and MSIs */
	writel(doorbell_mask_reg,
	       per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
	if (doorbell_mask_reg & IPI_DOORBELL_MASK)
		writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
	if (doorbell_mask_reg & PCI_MSI_DOORBELL_MASK)
		writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
}

static struct syscore_ops armada_370_xp_mpic_syscore_ops = {
	.suspend	= armada_370_xp_mpic_suspend,
	.resume		= armada_370_xp_mpic_resume,
};

static int __init armada_370_xp_mpic_of_init(struct device_node *node,
					     struct device_node *parent)
{
	struct resource main_int_res, per_cpu_int_res;
	int nr_irqs, i;
	u32 control;

	BUG_ON(of_address_to_resource(node, 0, &main_int_res));
	BUG_ON(of_address_to_resource(node, 1, &per_cpu_int_res));

	BUG_ON(!request_mem_region(main_int_res.start,
				   resource_size(&main_int_res),
				   node->full_name));
	BUG_ON(!request_mem_region(per_cpu_int_res.start,
				   resource_size(&per_cpu_int_res),
				   node->full_name));

	main_int_base = ioremap(main_int_res.start,
				resource_size(&main_int_res));
	BUG_ON(!main_int_base);

	per_cpu_int_base = ioremap(per_cpu_int_res.start,
				   resource_size(&per_cpu_int_res));
	BUG_ON(!per_cpu_int_base);

	control = readl(main_int_base + ARMADA_370_XP_INT_CONTROL);
	nr_irqs = (control >> 2) & 0x3ff;

	for (i = 0; i < nr_irqs; i++)
		writel(i, main_int_base + ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS);

	armada_370_xp_mpic_domain =
		irq_domain_add_linear(node, nr_irqs,
				&armada_370_xp_mpic_irq_ops, NULL);
	BUG_ON(!armada_370_xp_mpic_domain);
	armada_370_xp_mpic_domain->bus_token = DOMAIN_BUS_WIRED;

	/* Setup for the boot CPU */
	armada_xp_mpic_perf_init();
	armada_xp_mpic_smp_cpu_init();

	armada_370_xp_msi_init(node, main_int_res.start);

	parent_irq = irq_of_parse_and_map(node, 0);
	if (parent_irq <= 0) {
		irq_set_default_host(armada_370_xp_mpic_domain);
		set_handle_irq(armada_370_xp_handle_irq);
#ifdef CONFIG_SMP
		set_smp_cross_call(armada_mpic_send_doorbell);
		cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_ARMADA_XP_STARTING,
					  "AP_IRQ_ARMADA_XP_STARTING",
					  armada_xp_mpic_starting_cpu, NULL);
#endif
	} else {
#ifdef CONFIG_SMP
		cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_ARMADA_CASC_STARTING,
					  "AP_IRQ_ARMADA_CASC_STARTING",
					  mpic_cascaded_starting_cpu, NULL);
#endif
		irq_set_chained_handler(parent_irq,
					armada_370_xp_mpic_handle_cascade_irq);
	}

	register_syscore_ops(&armada_370_xp_mpic_syscore_ops);

	return 0;
}

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