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path: root/drivers/irqchip/irq-armada-370-xp.c
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-rw-r--r--drivers/irqchip/irq-armada-370-xp.c541
1 files changed, 541 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
new file mode 100644
index 00000000000..574aba0eba4
--- /dev/null
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -0,0 +1,541 @@
+/*
+ * 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/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/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_INT_SOURCE_CPU_MASK 0xF
+
+#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 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;
+ int virq, hwirq;
+
+ 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);
+ unsigned long hwirq = d->hwirq;
+
+ irq_dispose_mapping(irq);
+ armada_370_xp_free_msi(hwirq);
+}
+
+static int armada_370_xp_check_msi_device(struct msi_chip *chip, struct pci_dev *dev,
+ int nvec, int type)
+{
+ /* We support MSI, but not MSI-X */
+ if (type == PCI_CAP_ID_MSI)
+ return 0;
+ return -EINVAL;
+}
+
+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->check_device = armada_370_xp_check_msi_device;
+ 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)
+{
+ 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 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
+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 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 int armada_xp_mpic_secondary_init(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
+ armada_xp_mpic_smp_cpu_init();
+ return NOTIFY_OK;
+}
+
+static struct notifier_block armada_370_xp_mpic_cpu_notifier = {
+ .notifier_call = armada_xp_mpic_secondary_init,
+ .priority = 100,
+};
+
+#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,
+};
+
+#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;
+
+ irq = irq_find_mapping(armada_370_xp_msi_domain,
+ msinr - 16);
+
+ if (is_chained)
+ generic_handle_irq(irq);
+ else
+ handle_IRQ(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(unsigned int irq,
+ struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_get_chip(irq);
+ unsigned long irqmap, irqn;
+ unsigned int cascade_irq;
+
+ chained_irq_enter(chip, desc);
+
+ irqmap = readl_relaxed(per_cpu_int_base + ARMADA_375_PPI_CAUSE);
+
+ if (irqmap & BIT(0)) {
+ armada_370_xp_handle_msi_irq(NULL, true);
+ irqmap &= ~BIT(0);
+ }
+
+ for_each_set_bit(irqn, &irqmap, BITS_PER_LONG) {
+ 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) {
+ irqnr = irq_find_mapping(armada_370_xp_mpic_domain,
+ irqnr);
+ handle_IRQ(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 __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 parent_irq, 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);
+
+#ifdef CONFIG_SMP
+ armada_xp_mpic_smp_cpu_init();
+#endif
+
+ 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);
+ register_cpu_notifier(&armada_370_xp_mpic_cpu_notifier);
+#endif
+ } else {
+ irq_set_chained_handler(parent_irq,
+ armada_370_xp_mpic_handle_cascade_irq);
+ }
+
+ return 0;
+}
+
+IRQCHIP_DECLARE(armada_370_xp_mpic, "marvell,mpic", armada_370_xp_mpic_of_init);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 13:07:20 +0000