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|
/*
* 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/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/msi.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
#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;
#ifdef CONFIG_PCI_MSI
static struct irq_domain *armada_370_xp_msi_domain;
static DECLARE_BITMAP(msi_used, PCI_MSI_DOORBELL_NR);
static DEFINE_MUTEX(msi_used_lock);
static phys_addr_t msi_doorbell_addr;
#endif
/*
* 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_PCI_MSI
static int armada_370_xp_alloc_msi(void)
{
int hwirq;
mutex_lock(&msi_used_lock);
hwirq = find_first_zero_bit(&msi_used, PCI_MSI_DOORBELL_NR);
if (hwirq >= PCI_MSI_DOORBELL_NR)
hwirq = -ENOSPC;
else
set_bit(hwirq, msi_used);
mutex_unlock(&msi_used_lock);
return hwirq;
}
static void armada_370_xp_free_msi(int hwirq)
{
mutex_lock(&msi_used_lock);
if (!test_bit(hwirq, msi_used))
pr_err("trying to free unused MSI#%d\n", hwirq);
else
clear_bit(hwirq, msi_used);
mutex_unlock(&msi_used_lock);
}
static int armada_370_xp_setup_msi_irq(struct msi_chip *chip,
struct pci_dev *pdev,
struct msi_desc *desc)
{
struct msi_msg msg;
irq_hw_number_t hwirq;
int virq;
hwirq = armada_370_xp_alloc_msi();
if (hwirq < 0)
return hwirq;
virq = irq_create_mapping(armada_370_xp_msi_domain, hwirq);
if (!virq) {
armada_370_xp_free_msi(hwirq);
return -EINVAL;
}
irq_set_msi_desc(virq, desc);
msg.address_lo = msi_doorbell_addr;
msg.address_hi = 0;
msg.data = 0xf00 | (hwirq + 16);
write_msi_msg(virq, &msg);
return 0;
}
static void armada_370_xp_teardown_msi_irq(struct msi_chip *chip,
unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
irq_dispose_mapping(irq);
armada_370_xp_free_msi(d->hwirq);
}
static struct irq_chip armada_370_xp_msi_irq_chip = {
.name = "armada_370_xp_msi_irq",
.irq_enable = unmask_msi_irq,
.irq_disable = mask_msi_irq,
.irq_mask = mask_msi_irq,
.irq_unmask = unmask_msi_irq,
};
static int armada_370_xp_msi_map(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hw)
{
irq_set_chip_and_handler(virq, &armada_370_xp_msi_irq_chip,
handle_simple_irq);
set_irq_flags(virq, IRQF_VALID);
return 0;
}
static const struct irq_domain_ops armada_370_xp_msi_irq_ops = {
.map = armada_370_xp_msi_map,
};
static int armada_370_xp_msi_init(struct device_node *node,
phys_addr_t main_int_phys_base)
{
struct msi_chip *msi_chip;
u32 reg;
int ret;
msi_doorbell_addr = main_int_phys_base +
ARMADA_370_XP_SW_TRIG_INT_OFFS;
msi_chip = kzalloc(sizeof(*msi_chip), GFP_KERNEL);
if (!msi_chip)
return -ENOMEM;
msi_chip->setup_irq = armada_370_xp_setup_msi_irq;
msi_chip->teardown_irq = armada_370_xp_teardown_msi_irq;
msi_chip->of_node = node;
armada_370_xp_msi_domain =
irq_domain_add_linear(NULL, PCI_MSI_DOORBELL_NR,
&armada_370_xp_msi_irq_ops,
NULL);
if (!armada_370_xp_msi_domain) {
kfree(msi_chip);
return -ENOMEM;
}
ret = of_pci_msi_chip_add(msi_chip);
if (ret < 0) {
irq_domain_remove(armada_370_xp_msi_domain);
kfree(msi_chip);
return ret;
}
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)
{
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(
|