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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2013-04-09 23:26:15 +0200
committerJason Cooper <jason@lakedaemon.net>2013-04-15 19:34:36 +0000
commit9339d432fdf4b492d2209316791b6e54cdae0242 (patch)
tree7ae6520bbff2508776bb04c41ee48e15d9cb74e7 /arch/arm/mach-mvebu
parente33369cbf346a41daab7d2eaf23c7e5bb76ef67c (diff)
downloadop-kernel-dev-9339d432fdf4b492d2209316791b6e54cdae0242.zip
op-kernel-dev-9339d432fdf4b492d2209316791b6e54cdae0242.tar.gz
irqchip: move IRQ driver for Armada 370/XP
When the Marvell Armada 370/XP support was included in the kernel, the drivers/irqchip/ directory didn't exist and the minimal infrastructure in it also didn't exist. Now that we have those things in place, we move the Armada 370/XP IRQ controller driver from arch/arm/mach-mvebu/irq-armada-370-xp.c to drivers/irqchip/irq-armada-370-xp.c. Note in order to reduce code movement and therefore ease the review of this patch, we intentionally introduce a forward declaration of armada_370_xp_handle_irq(). It is in fact not needed because this handler can now simply be implemented before armada_370_xp_mpic_of_init(). That will be done in the next commit. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'arch/arm/mach-mvebu')
-rw-r--r--arch/arm/mach-mvebu/Makefile2
-rw-r--r--arch/arm/mach-mvebu/armada-370-xp.c4
-rw-r--r--arch/arm/mach-mvebu/irq-armada-370-xp.c294
3 files changed, 3 insertions, 297 deletions
diff --git a/arch/arm/mach-mvebu/Makefile b/arch/arm/mach-mvebu/Makefile
index da93bcb..c3be068 100644
--- a/arch/arm/mach-mvebu/Makefile
+++ b/arch/arm/mach-mvebu/Makefile
@@ -5,6 +5,6 @@ AFLAGS_coherency_ll.o := -Wa,-march=armv7-a
obj-y += system-controller.o
obj-$(CONFIG_MACH_ARMADA_370_XP) += armada-370-xp.o
-obj-$(CONFIG_ARCH_MVEBU) += addr-map.o coherency.o coherency_ll.o pmsu.o irq-armada-370-xp.o
+obj-$(CONFIG_ARCH_MVEBU) += addr-map.o coherency.o coherency_ll.o pmsu.o
obj-$(CONFIG_SMP) += platsmp.o headsmp.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
diff --git a/arch/arm/mach-mvebu/armada-370-xp.c b/arch/arm/mach-mvebu/armada-370-xp.c
index c1bbfa7..433e8c5 100644
--- a/arch/arm/mach-mvebu/armada-370-xp.c
+++ b/arch/arm/mach-mvebu/armada-370-xp.c
@@ -19,6 +19,7 @@
#include <linux/time-armada-370-xp.h>
#include <linux/clk/mvebu.h>
#include <linux/dma-mapping.h>
+#include <linux/irqchip.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
@@ -77,8 +78,7 @@ DT_MACHINE_START(ARMADA_XP_DT, "Marvell Armada 370/XP (Device Tree)")
.init_machine = armada_370_xp_dt_init,
.map_io = armada_370_xp_map_io,
.init_early = armada_370_xp_init_early,
- .init_irq = armada_370_xp_init_irq,
- .handle_irq = armada_370_xp_handle_irq,
+ .init_irq = irqchip_init,
.init_time = armada_370_xp_timer_and_clk_init,
.restart = mvebu_restart,
.dt_compat = armada_370_xp_dt_compat,
diff --git a/arch/arm/mach-mvebu/irq-armada-370-xp.c b/arch/arm/mach-mvebu/irq-armada-370-xp.c
deleted file mode 100644
index f6699f3..0000000
--- a/arch/arm/mach-mvebu/irq-armada-370-xp.c
+++ /dev/null
@@ -1,294 +0,0 @@
-/*
- * 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/irqdomain.h>
-#include <asm/mach/arch.h>
-#include <asm/exception.h>
-#include <asm/smp_plat.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 ACTIVE_DOORBELLS (8)
-
-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 interrtups, mask/unmask the calling CPU's bit
- */
-static void armada_370_xp_irq_mask(struct irq_data *d)
-{
-#ifdef CONFIG_SMP
- 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);
-#else
- writel(irqd_to_hwirq(d),
- per_cpu_int_base + ARMADA_370_XP_INT_SET_MASK_OFFS);
-#endif
-}
-
-static void armada_370_xp_irq_unmask(struct irq_data *d)
-{
-#ifdef CONFIG_SMP
- 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);
-#else
- writel(irqd_to_hwirq(d),
- per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
-#endif
-}
-
-#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));
- 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((1 << ACTIVE_DOORBELLS) - 1, 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 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
-
- return 0;
-}
-
-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)
- & 0xFF;
-
- writel(0x0, per_cpu_int_base +
- ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
-
- /* Handle all pending doorbells */
- for (ipinr = 0; ipinr < ACTIVE_DOORBELLS; ipinr++) {
- if (ipimask & (0x1 << ipinr))
- handle_IPI(ipinr, regs);
- }
- continue;
- }
-#endif
-
- } while (1);
-}
-
-static const struct of_device_id mpic_of_match[] __initconst = {
- {.compatible = "marvell,mpic", .data = armada_370_xp_mpic_of_init},
- {},
-};
-
-void __init armada_370_xp_init_irq(void)
-{
- of_irq_init(mpic_of_match);
-}
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