/*
* 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/bits.h>
#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 <linux/types.h>
#include <asm/mach/arch.h>
#include <asm/exception.h>
#include <asm/smp_plat.h>
#include <asm/mach/irq.h>
/*
* Overall diagram of the Armada XP interrupt controller:
*
* To CPU 0 To CPU 1
*
* /\ /\
* || ||
* +---------------+ +---------------+
* | | | |
* | per-CPU | | per-CPU |
* | mask/unmask | | mask/unmask |
* | CPU0 | | CPU1 |
* | | | |
* +---------------+ +---------------+
* /\ /\
* || ||
* \\_______________________//
* ||
* +-------------------+
* | |
* | Global interrupt |
* | mask/unmask |
* | |
* +-------------------+
* /\
* ||
* interrupt from
* device
*
* The "global interrupt mask/unmask" is modified using the
* ARMADA_370_XP_INT_SET_ENABLE_OFFS and
* ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS registers, which are relative
* to "main_int_base".
*
* The "per-CPU mask/unmask" is modified using the
* ARMADA_370_XP_INT_SET_MASK_OFFS and
* ARMADA_370_XP_INT_CLEAR_MASK_OFFS registers, which are relative to
* "per_cpu_int_base". This base address points to a special address,
* which automatically accesses the registers of the current CPU.
*
* The per-CPU mask/unmask can also be adjusted using the global
* per-interrupt ARMADA_370_XP_INT_SOURCE_CTL register, which we use
* to configure interrupt affinity.
*
* Due to this model, all interrupts need to be mask/unmasked at two
* different levels: at the global level and at the per-CPU level.
*
* This driver takes the following approach to deal with this:
*
* - For global interrupts:
*
* At ->map() time, a global interrupt is unmasked at the per-CPU
* mask/unmask level. It is therefore unmasked at this level for
* the current CPU, running the ->map() code. This allows to have
* the interrupt unmasked at this level in non-SMP
* configurations. In SMP configurations, the ->set_affinity()
* callback is called, which using the
* ARMADA_370_XP_INT_SOURCE_CTL() readjusts the per-CPU mask/unmask
* for the interrupt.
*
* The ->mask() and ->unmask() operations only mask/unmask the
* interrupt at the "global" level.
*
* So, a global interrupt is enabled at the per-CPU level as soon
* as it is mapped. At run time, the masking/unmasking takes place
* at the global level.
*
* - For per-CPU interrupts
*
* At ->map() time, a per-CPU interrupt is unmasked at the global
* mask/unmask level.
*
* The ->mask() and ->unmask() operations mask/unmask the interrupt
* at the per-CPU level.
*
* So, a per-CPU interrupt is enabled at the global level as soon
* as it is mapped. At run time, the masking/unmasking takes place
* at the per-CPU level.
*/
/* Registers relative to main_int_base */
#define ARMADA_370_XP_INT_CONTROL (0x00)
#define ARMADA_370_XP_SW_TRIG_INT_OFFS (0x04)
#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)
/* Registers relative to per_cpu_int_base */
#define ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS (0x08)
#define ARMADA_370_XP_IN_DRBEL_MSK_OFFS (0x0c)
#define ARMADA_375_PPI_CAUSE (0x10)
#define ARMADA_370_XP_CPU_INTACK_OFFS (0x44)
#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_MAX_PER_CPU_IRQS (28)
/* IPI and MSI interrupt definitions for IPI platforms */
#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
/* MSI interrupt definitions for non-IPI platforms */
#define PCI_MSI_FULL_DOORBELL_START 0
#define PCI_MSI_FULL_DOORBELL_NR 32
#define PCI_MSI_FULL_DOORBELL_END 32
#define PCI_MSI_FULL_DOORBELL_MASK GENMASK(31, 0)
#define PCI_MSI_FULL_DOORBELL_SRC0_MASK GENMASK(15, 0)
#define PCI_MSI_FULL_DOORBELL_SRC1_MASK GENMASK(31, 16)
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_FULL_DOORBELL_NR);
static DEFINE_MUTEX(msi_used_lock);
static phys_addr_t msi_doorbell_addr;
#endif
static inline bool is_ipi_available(void)
{
/*
* We distinguish IPI availability in the IC by the IC not having a
* parent irq defined. If a parent irq is defined, there is a parent
* interrupt controller (e.g. GIC) that takes care of inter-processor
* interrupts.
*/
return parent_irq <= 0;
}
static inline u32 msi_doorbell_mask(void)
{
return is_ipi_available() ? PCI_MSI_DOORBELL_MASK :
PCI_MSI_FULL_DOORBELL_MASK;
}
static inline unsigned int msi_doorbell_start(void)
{
return is_ipi_available() ? PCI_MSI_DOORBELL_START :
PCI_MSI_FULL_DOORBELL_START;
}
static inline unsigned int msi_doorbell_size(void)
{
return is_ipi_available() ? PCI_MSI_DOORBELL_NR :
PCI_MSI_FULL_DOORBELL_NR;
}
static inline unsigned int msi_doorbell_end(void)
{
return is_ipi_available() ? PCI_MSI_DOORBELL_END :
PCI_MSI_FULL_DOORBELL_END;
}
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 | MSI_FLAG_PCI_MSIX),
.chip = &armada_370_xp_msi_irq_chip,
};
static void armada_370_xp_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
{
unsigned int cpu = cpumask_first(irq_data_get_effective_affinity_mask(data));
msg->address_lo = lower_32_bits(msi_doorbell_addr);
msg->address_hi = upper_32_bits(msi_doorbell_addr);
msg->data = BIT(cpu + 8) | (data->hwirq + msi_doorbell_start());
}
static int armada_370_xp_msi_set_affinity(struct irq_data *irq_data,
const struct cpumask *mask, bool force)
{
unsigned int cpu;
if (!force)
cpu = cpumask_any_and(mask, cpu_online_mask);
else
cpu = cpumask_first(mask);
if (cpu >= nr_cpu_ids)
return -EINVAL;
irq_data_update_effective_affinity(irq_data, cpumask_of(cpu));
return IRQ_SET_MASK_OK;
}
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_free_region(msi_used, msi_doorbell_size(),
order_base_2(nr_irqs));
mutex_unlock(&msi_used_lock);
if (hwirq < 0)
return -ENOSPC;
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 0;
}
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_release_region(msi_used, d->hwirq, order_base_2(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 void armada_370_xp_msi_reenable_percpu(void)
{
u32 reg;
/* Enable MSI doorbell mask and combined cpu local interrupt */
reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
reg |= msi_doorbell_mask();
writel(reg, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
/* Unmask local doorbell interrupt */
writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
}
static int armada_370_xp_msi_init(struct device_node *node,
phys_addr_t main_int_phys_base)
{
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, msi_doorbell_size(),
&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;
}
armada_370_xp_msi_reenable_percpu();
/* Unmask low 16 MSI irqs on non-IPI platforms */
if (!is_ipi_available())
writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
return 0;
}
#else
static __maybe_unused void armada_370_xp_msi_reenable_percpu(void) {}
static inline int armada_370_xp_msi_init(struct device_node *node,
phys_addr_t main_int_phys_base)
{
return 0;
}
#endif
static void armada_xp_mpic_perf_init(void)
{
unsigned long cpuid;
/*
* This Performance Counter Overflow interrupt is specific for
* Armada 370 and XP. It is not available on Armada 375, 38x and 39x.
*/
if (!of_machine_is_compatible("marvell,armada-370-xp"))
return;
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 struct irq_domain *ipi_domain;
static void armada_370_xp_ipi_mask(struct irq_data *d)
{
u32 reg;
reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
reg &= ~BIT(d->hwirq);
writel(reg, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
}
static void armada_370_xp_ipi_unmask(struct irq_data *d)
{
u32 reg;
reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
reg |= BIT(d->hwirq);
writel(reg, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
}
static void armada_370_xp_ipi_send_mask(struct irq_data *d,
const struct cpumask *mask)
{
unsigned long map = 0;
int cpu;
/* 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) | d->hwirq, main_int_base +
ARMADA_370_XP_SW_TRIG_INT_OFFS);
}
static void armada_370_xp_ipi_ack(struct irq_data *d)
{
writel(~BIT(d->hwirq), per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
}
static struct irq_chip ipi_irqchip = {
.name = "IPI",
.irq_ack = armada_370_xp_ipi_ack,
.irq_mask = armada_370_xp_ipi_mask,
.irq_unmask = armada_370_xp_ipi_unmask,
.ipi_send_mask = armada_370_xp_ipi_send_mask,
};
static int armada_370_xp_ipi_alloc(struct irq_domain *d,
unsigned int virq,
unsigned int nr_irqs, void *args)
{
int i;
for (i = 0; i < nr_irqs; i++) {
irq_set_percpu_devid(virq + i);
irq_domain_set_info(d, virq + i, i, &ipi_irqchip,
d->host_data,
handle_percpu_devid_irq,
NULL, NULL);
}
return 0;
}
static void armada_370_xp_ipi_free(struct irq_domain *d,
unsigned int virq,
unsigned int nr_irqs)
{
/* Not freeing IPIs */
}
static const struct irq_domain_ops ipi_domain_ops = {
.alloc = armada_370_xp_ipi_alloc,
.free = armada_370_xp_ipi_free,
};
static void ipi_resume(void)
{
int i;
for (i = 0; i < IPI_DOORBELL_END; i++) {
int irq;
irq = irq_find_mapping(ipi_domain, i);
if (irq <= 0)
continue;
if (irq_percpu_is_enabled(irq)) {
struct irq_data *d;
d = irq_domain_get_irq_data(ipi_domain, irq);
armada_370_xp_ipi_unmask(d);
}
}
}
static __init void armada_xp_ipi_init(struct device_node *node)
{
int base_ipi;
ipi_domain = irq_domain_create_linear(of_node_to_fwnode(node),
IPI_DOORBELL_END,
&ipi_domain_ops, NULL);
if (WARN_ON(!ipi_domain))
return;
irq_domain_update_bus_token(ipi_domain, DOMAIN_BUS_IPI);
base_ipi = irq_domain_alloc_irqs(ipi_domain, IPI_DOORBELL_END, NUMA_NO_NODE, NULL);
if (WARN_ON(!base_ipi))
return;
set_smp_ipi_range(base_ipi, IPI_DOORBELL_END);
}
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);
int cpu;
/* Select a single core from the affinity mask which is online */
cpu = cpumask_any_and(mask_val, cpu_online_mask);
atomic_io_modify(main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq),
ARMADA_370_XP_INT_SOURCE_CPU_MASK,
BIT(cpu_logical_map(cpu)));
irq_data_update_effective_affinity(d, cpumask_of(cpu));
return IRQ_SET_MASK_OK;
}
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);
if (!is_ipi_available())
return;
/* Disable all IPIs */
writel(0, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
/* Clear pending IPIs */
writel(0, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
/* Unmask IPI interrupt */
writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
}
static void armada_xp_mpic_reenable_percpu(void)
{
unsigned int irq;
/* Re-enable per-CPU interrupts that were enabled before suspend */
for (irq = 0; irq < ARMADA_370_XP_MAX_PER_CPU_IRQS; irq++) {
struct irq_data *data;
int virq;
virq = irq_linear_revmap(armada_370_xp_mpic_domain, irq);
if (virq == 0)
continue;
data = irq_get_irq_data(virq);
if (!irq_percpu_is_enabled(virq))
continue;
armada_370_xp_irq_unmask(data);
}
if (is_ipi_available())
ipi_resume();
armada_370_xp_msi_reenable_percpu();
}
static int armada_xp_mpic_starting_cpu(unsigned int cpu)
{
armada_xp_mpic_perf_init();
armada_xp_mpic_smp_cpu_init();
armada_xp_mpic_reenable_percpu();
return 0;
}
static int mpic_cascaded_starting_cpu(unsigned int cpu)
{
armada_xp_mpic_perf_init();
armada_xp_mpic_reenable_percpu();
enable_percpu_irq(parent_irq, IRQ_TYPE_NONE);
return 0;
}
#else
static void armada_xp_mpic_smp_cpu_init(void) {}
static void ipi_resume(void) {}
#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)
{
/* IRQs 0 and 1 cannot be mapped, they are handled internally */
if (hw <= 1)
return -EINVAL;
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);
irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq)));
}
irq_set_probe(virq);
return 0;
}
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);
msimask &= msi_doorbell_mask();
writel(~msimask, per_cpu_int_base +
ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
for (msinr = msi_doorbell_start();
msinr < msi_doorbell_end(); msinr++) {
unsigned int irq;
if (!(msimask & BIT(msinr)))
continue;
irq = msinr - msi_doorbell_start();
generic_handle_domain_irq(armada_370_xp_msi_inner_domain, irq);
}
}
#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;
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 == 0 || irqn == 1) {
armada_370_xp_handle_msi_irq(NULL, true);
continue;
}
generic_handle_domain_irq(armada_370_xp_mpic_domain, irqn);
}
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) {
generic_handle_domain_irq(armada_370_xp_mpic_domain,
irqnr);
continue;
}
/* MSI handling */
if (irqnr == 1)
armada_370_xp_handle_msi_irq(regs, false);
#ifdef CONFIG_SMP
/* IPI Handling */
if (irqnr == 0) {
unsigned long ipimask;
int ipi;
ipimask = readl_relaxed(per_cpu_int_base +
ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS)
& IPI_DOORBELL_MASK;
for_each_set_bit(ipi, &ipimask, IPI_DOORBELL_END)
generic_handle_domain_irq(ipi_domain, ipi);
}
#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)
{
bool src0, src1;
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;
data = irq_get_irq_data(virq);
if (!is_percpu_irq(irq)) {
/* Non per-CPU interrupts */
writel(irq, per_cpu_int_base +
ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
if (!irqd_irq_disabled(data))
armada_370_xp_irq_unmask(data);
} else {
/* Per-CPU interrupts */
writel(irq, main_int_base +
ARMADA_370_XP_INT_SET_ENABLE_OFFS);
/*
* Re-enable on the current CPU,
* armada_xp_mpic_reenable_percpu() will take
* care of secondary CPUs when they come up.
*/
if (irq_percpu_is_enabled(virq))
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 (is_ipi_available()) {
src0 = doorbell_mask_reg & IPI_DOORBELL_MASK;
src1 = doorbell_mask_reg & PCI_MSI_DOORBELL_MASK;
} else {
src0 = doorbell_mask_reg & PCI_MSI_FULL_DOORBELL_SRC0_MASK;
src1 = doorbell_mask_reg & PCI_MSI_FULL_DOORBELL_SRC1_MASK;
}
if (src0)
writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
if (src1)
writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
if (is_ipi_available())
ipi_resume();
}
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);
irq_domain_update_bus_token(armada_370_xp_mpic_domain, DOMAIN_BUS_WIRED);
/*
* Initialize parent_irq before calling any other functions, since it is
* used to distinguish between IPI and non-IPI platforms.
*/
parent_irq = irq_of_parse_and_map(node, 0);
/* 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);
if (parent_irq <= 0) {
irq_set_default_host(armada_370_xp_mpic_domain);
set_handle_irq(armada_370_xp_handle_irq);
#ifdef CONFIG_SMP
armada_xp_ipi_init(node);
cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_ARMADA_XP_STARTING,
"irqchip/armada/ipi:starting",
armada_xp_mpic_starting_cpu, NULL);
#endif
} else {
#ifdef CONFIG_SMP
cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_ARMADA_XP_STARTING,
"irqchip/armada/cascade: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);
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