2 * Marvell Armada 370 and Armada XP SoC IRQ handling
4 * Copyright (C) 2012 Marvell
6 * Lior Amsalem <alior@marvell.com>
7 * Gregory CLEMENT <gregory.clement@free-electrons.com>
8 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
9 * Ben Dooks <ben.dooks@codethink.co.uk>
11 * This file is licensed under the terms of the GNU General Public
12 * License version 2. This program is licensed "as is" without any
13 * warranty of any kind, whether express or implied.
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/irq.h>
20 #include <linux/interrupt.h>
21 #include <linux/irqchip.h>
22 #include <linux/irqchip/chained_irq.h>
23 #include <linux/cpu.h>
25 #include <linux/of_address.h>
26 #include <linux/of_irq.h>
27 #include <linux/of_pci.h>
28 #include <linux/irqdomain.h>
29 #include <linux/slab.h>
30 #include <linux/syscore_ops.h>
31 #include <linux/msi.h>
32 #include <asm/mach/arch.h>
33 #include <asm/exception.h>
34 #include <asm/smp_plat.h>
35 #include <asm/mach/irq.h>
38 * Overall diagram of the Armada XP interrupt controller:
44 * +---------------+ +---------------+
46 * | per-CPU | | per-CPU |
47 * | mask/unmask | | mask/unmask |
50 * +---------------+ +---------------+
53 * \\_______________________//
55 * +-------------------+
57 * | Global interrupt |
60 * +-------------------+
66 * The "global interrupt mask/unmask" is modified using the
67 * ARMADA_370_XP_INT_SET_ENABLE_OFFS and
68 * ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS registers, which are relative
71 * The "per-CPU mask/unmask" is modified using the
72 * ARMADA_370_XP_INT_SET_MASK_OFFS and
73 * ARMADA_370_XP_INT_CLEAR_MASK_OFFS registers, which are relative to
74 * "per_cpu_int_base". This base address points to a special address,
75 * which automatically accesses the registers of the current CPU.
77 * The per-CPU mask/unmask can also be adjusted using the global
78 * per-interrupt ARMADA_370_XP_INT_SOURCE_CTL register, which we use
79 * to configure interrupt affinity.
81 * Due to this model, all interrupts need to be mask/unmasked at two
82 * different levels: at the global level and at the per-CPU level.
84 * This driver takes the following approach to deal with this:
86 * - For global interrupts:
88 * At ->map() time, a global interrupt is unmasked at the per-CPU
89 * mask/unmask level. It is therefore unmasked at this level for
90 * the current CPU, running the ->map() code. This allows to have
91 * the interrupt unmasked at this level in non-SMP
92 * configurations. In SMP configurations, the ->set_affinity()
93 * callback is called, which using the
94 * ARMADA_370_XP_INT_SOURCE_CTL() readjusts the per-CPU mask/unmask
97 * The ->mask() and ->unmask() operations only mask/unmask the
98 * interrupt at the "global" level.
100 * So, a global interrupt is enabled at the per-CPU level as soon
101 * as it is mapped. At run time, the masking/unmasking takes place
102 * at the global level.
104 * - For per-CPU interrupts
106 * At ->map() time, a per-CPU interrupt is unmasked at the global
109 * The ->mask() and ->unmask() operations mask/unmask the interrupt
110 * at the per-CPU level.
112 * So, a per-CPU interrupt is enabled at the global level as soon
113 * as it is mapped. At run time, the masking/unmasking takes place
114 * at the per-CPU level.
117 /* Registers relative to main_int_base */
118 #define ARMADA_370_XP_INT_CONTROL (0x00)
119 #define ARMADA_370_XP_SW_TRIG_INT_OFFS (0x04)
120 #define ARMADA_370_XP_INT_SET_ENABLE_OFFS (0x30)
121 #define ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS (0x34)
122 #define ARMADA_370_XP_INT_SOURCE_CTL(irq) (0x100 + irq*4)
123 #define ARMADA_370_XP_INT_SOURCE_CPU_MASK 0xF
124 #define ARMADA_370_XP_INT_IRQ_FIQ_MASK(cpuid) ((BIT(0) | BIT(8)) << cpuid)
126 /* Registers relative to per_cpu_int_base */
127 #define ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS (0x08)
128 #define ARMADA_370_XP_IN_DRBEL_MSK_OFFS (0x0c)
129 #define ARMADA_375_PPI_CAUSE (0x10)
130 #define ARMADA_370_XP_CPU_INTACK_OFFS (0x44)
131 #define ARMADA_370_XP_INT_SET_MASK_OFFS (0x48)
132 #define ARMADA_370_XP_INT_CLEAR_MASK_OFFS (0x4C)
133 #define ARMADA_370_XP_INT_FABRIC_MASK_OFFS (0x54)
134 #define ARMADA_370_XP_INT_CAUSE_PERF(cpu) (1 << cpu)
136 #define ARMADA_370_XP_MAX_PER_CPU_IRQS (28)
138 #define IPI_DOORBELL_START (0)
139 #define IPI_DOORBELL_END (8)
140 #define IPI_DOORBELL_MASK 0xFF
141 #define PCI_MSI_DOORBELL_START (16)
142 #define PCI_MSI_DOORBELL_NR (16)
143 #define PCI_MSI_DOORBELL_END (32)
144 #define PCI_MSI_DOORBELL_MASK 0xFFFF0000
146 static void __iomem *per_cpu_int_base;
147 static void __iomem *main_int_base;
148 static struct irq_domain *armada_370_xp_mpic_domain;
149 static u32 doorbell_mask_reg;
150 static int parent_irq;
151 #ifdef CONFIG_PCI_MSI
152 static struct irq_domain *armada_370_xp_msi_domain;
153 static struct irq_domain *armada_370_xp_msi_inner_domain;
154 static DECLARE_BITMAP(msi_used, PCI_MSI_DOORBELL_NR);
155 static DEFINE_MUTEX(msi_used_lock);
156 static phys_addr_t msi_doorbell_addr;
159 static inline bool is_percpu_irq(irq_hw_number_t irq)
161 if (irq <= ARMADA_370_XP_MAX_PER_CPU_IRQS)
169 * For shared global interrupts, mask/unmask global enable bit
170 * For CPU interrupts, mask/unmask the calling CPU's bit
172 static void armada_370_xp_irq_mask(struct irq_data *d)
174 irq_hw_number_t hwirq = irqd_to_hwirq(d);
176 if (!is_percpu_irq(hwirq))
177 writel(hwirq, main_int_base +
178 ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS);
180 writel(hwirq, per_cpu_int_base +
181 ARMADA_370_XP_INT_SET_MASK_OFFS);
184 static void armada_370_xp_irq_unmask(struct irq_data *d)
186 irq_hw_number_t hwirq = irqd_to_hwirq(d);
188 if (!is_percpu_irq(hwirq))
189 writel(hwirq, main_int_base +
190 ARMADA_370_XP_INT_SET_ENABLE_OFFS);
192 writel(hwirq, per_cpu_int_base +
193 ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
196 #ifdef CONFIG_PCI_MSI
198 static struct irq_chip armada_370_xp_msi_irq_chip = {
200 .irq_mask = pci_msi_mask_irq,
201 .irq_unmask = pci_msi_unmask_irq,
204 static struct msi_domain_info armada_370_xp_msi_domain_info = {
205 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
206 MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX),
207 .chip = &armada_370_xp_msi_irq_chip,
210 static void armada_370_xp_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
212 msg->address_lo = lower_32_bits(msi_doorbell_addr);
213 msg->address_hi = upper_32_bits(msi_doorbell_addr);
214 msg->data = 0xf00 | (data->hwirq + PCI_MSI_DOORBELL_START);
217 static int armada_370_xp_msi_set_affinity(struct irq_data *irq_data,
218 const struct cpumask *mask, bool force)
223 static struct irq_chip armada_370_xp_msi_bottom_irq_chip = {
225 .irq_compose_msi_msg = armada_370_xp_compose_msi_msg,
226 .irq_set_affinity = armada_370_xp_msi_set_affinity,
229 static int armada_370_xp_msi_alloc(struct irq_domain *domain, unsigned int virq,
230 unsigned int nr_irqs, void *args)
234 mutex_lock(&msi_used_lock);
235 hwirq = bitmap_find_free_region(msi_used, PCI_MSI_DOORBELL_NR,
236 order_base_2(nr_irqs));
237 mutex_unlock(&msi_used_lock);
242 for (i = 0; i < nr_irqs; i++) {
243 irq_domain_set_info(domain, virq + i, hwirq + i,
244 &armada_370_xp_msi_bottom_irq_chip,
245 domain->host_data, handle_simple_irq,
252 static void armada_370_xp_msi_free(struct irq_domain *domain,
253 unsigned int virq, unsigned int nr_irqs)
255 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
257 mutex_lock(&msi_used_lock);
258 bitmap_release_region(msi_used, d->hwirq, order_base_2(nr_irqs));
259 mutex_unlock(&msi_used_lock);
262 static const struct irq_domain_ops armada_370_xp_msi_domain_ops = {
263 .alloc = armada_370_xp_msi_alloc,
264 .free = armada_370_xp_msi_free,
267 static int armada_370_xp_msi_init(struct device_node *node,
268 phys_addr_t main_int_phys_base)
272 msi_doorbell_addr = main_int_phys_base +
273 ARMADA_370_XP_SW_TRIG_INT_OFFS;
275 armada_370_xp_msi_inner_domain =
276 irq_domain_add_linear(NULL, PCI_MSI_DOORBELL_NR,
277 &armada_370_xp_msi_domain_ops, NULL);
278 if (!armada_370_xp_msi_inner_domain)
281 armada_370_xp_msi_domain =
282 pci_msi_create_irq_domain(of_node_to_fwnode(node),
283 &armada_370_xp_msi_domain_info,
284 armada_370_xp_msi_inner_domain);
285 if (!armada_370_xp_msi_domain) {
286 irq_domain_remove(armada_370_xp_msi_inner_domain);
290 reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS)
291 | PCI_MSI_DOORBELL_MASK;
293 writel(reg, per_cpu_int_base +
294 ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
296 /* Unmask IPI interrupt */
297 writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
302 static inline int armada_370_xp_msi_init(struct device_node *node,
303 phys_addr_t main_int_phys_base)
310 static DEFINE_RAW_SPINLOCK(irq_controller_lock);
312 static int armada_xp_set_affinity(struct irq_data *d,
313 const struct cpumask *mask_val, bool force)
315 irq_hw_number_t hwirq = irqd_to_hwirq(d);
316 unsigned long reg, mask;
319 /* Select a single core from the affinity mask which is online */
320 cpu = cpumask_any_and(mask_val, cpu_online_mask);
321 mask = 1UL << cpu_logical_map(cpu);
323 raw_spin_lock(&irq_controller_lock);
324 reg = readl(main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));
325 reg = (reg & (~ARMADA_370_XP_INT_SOURCE_CPU_MASK)) | mask;
326 writel(reg, main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));
327 raw_spin_unlock(&irq_controller_lock);
329 irq_data_update_effective_affinity(d, cpumask_of(cpu));
331 return IRQ_SET_MASK_OK;
335 static struct irq_chip armada_370_xp_irq_chip = {
337 .irq_mask = armada_370_xp_irq_mask,
338 .irq_mask_ack = armada_370_xp_irq_mask,
339 .irq_unmask = armada_370_xp_irq_unmask,
341 .irq_set_affinity = armada_xp_set_affinity,
343 .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND,
346 static int armada_370_xp_mpic_irq_map(struct irq_domain *h,
347 unsigned int virq, irq_hw_number_t hw)
349 armada_370_xp_irq_mask(irq_get_irq_data(virq));
350 if (!is_percpu_irq(hw))
351 writel(hw, per_cpu_int_base +
352 ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
354 writel(hw, main_int_base + ARMADA_370_XP_INT_SET_ENABLE_OFFS);
355 irq_set_status_flags(virq, IRQ_LEVEL);
357 if (is_percpu_irq(hw)) {
358 irq_set_percpu_devid(virq);
359 irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip,
360 handle_percpu_devid_irq);
362 irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip,
364 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq)));
371 static void armada_xp_mpic_smp_cpu_init(void)
376 control = readl(main_int_base + ARMADA_370_XP_INT_CONTROL);
377 nr_irqs = (control >> 2) & 0x3ff;
379 for (i = 0; i < nr_irqs; i++)
380 writel(i, per_cpu_int_base + ARMADA_370_XP_INT_SET_MASK_OFFS);
382 /* Clear pending IPIs */
383 writel(0, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
385 /* Enable first 8 IPIs */
386 writel(IPI_DOORBELL_MASK, per_cpu_int_base +
387 ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
389 /* Unmask IPI interrupt */
390 writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
393 static void armada_xp_mpic_perf_init(void)
395 unsigned long cpuid = cpu_logical_map(smp_processor_id());
397 /* Enable Performance Counter Overflow interrupts */
398 writel(ARMADA_370_XP_INT_CAUSE_PERF(cpuid),
399 per_cpu_int_base + ARMADA_370_XP_INT_FABRIC_MASK_OFFS);
403 static void armada_mpic_send_doorbell(const struct cpumask *mask,
407 unsigned long map = 0;
409 /* Convert our logical CPU mask into a physical one. */
410 for_each_cpu(cpu, mask)
411 map |= 1 << cpu_logical_map(cpu);
414 * Ensure that stores to Normal memory are visible to the
415 * other CPUs before issuing the IPI.
420 writel((map << 8) | irq, main_int_base +
421 ARMADA_370_XP_SW_TRIG_INT_OFFS);
424 static void armada_xp_mpic_reenable_percpu(void)
428 /* Re-enable per-CPU interrupts that were enabled before suspend */
429 for (irq = 0; irq < ARMADA_370_XP_MAX_PER_CPU_IRQS; irq++) {
430 struct irq_data *data;
433 virq = irq_linear_revmap(armada_370_xp_mpic_domain, irq);
437 data = irq_get_irq_data(virq);
439 if (!irq_percpu_is_enabled(virq))
442 armada_370_xp_irq_unmask(data);
446 static int armada_xp_mpic_starting_cpu(unsigned int cpu)
448 armada_xp_mpic_perf_init();
449 armada_xp_mpic_smp_cpu_init();
450 armada_xp_mpic_reenable_percpu();
454 static int mpic_cascaded_starting_cpu(unsigned int cpu)
456 armada_xp_mpic_perf_init();
457 armada_xp_mpic_reenable_percpu();
458 enable_percpu_irq(parent_irq, IRQ_TYPE_NONE);
463 static const struct irq_domain_ops armada_370_xp_mpic_irq_ops = {
464 .map = armada_370_xp_mpic_irq_map,
465 .xlate = irq_domain_xlate_onecell,
468 #ifdef CONFIG_PCI_MSI
469 static void armada_370_xp_handle_msi_irq(struct pt_regs *regs, bool is_chained)
473 msimask = readl_relaxed(per_cpu_int_base +
474 ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS)
475 & PCI_MSI_DOORBELL_MASK;
477 writel(~msimask, per_cpu_int_base +
478 ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
480 for (msinr = PCI_MSI_DOORBELL_START;
481 msinr < PCI_MSI_DOORBELL_END; msinr++) {
484 if (!(msimask & BIT(msinr)))
488 irq = irq_find_mapping(armada_370_xp_msi_inner_domain,
489 msinr - PCI_MSI_DOORBELL_START);
490 generic_handle_irq(irq);
492 irq = msinr - PCI_MSI_DOORBELL_START;
493 handle_domain_irq(armada_370_xp_msi_inner_domain,
499 static void armada_370_xp_handle_msi_irq(struct pt_regs *r, bool b) {}
502 static void armada_370_xp_mpic_handle_cascade_irq(struct irq_desc *desc)
504 struct irq_chip *chip = irq_desc_get_chip(desc);
505 unsigned long irqmap, irqn, irqsrc, cpuid;
506 unsigned int cascade_irq;
508 chained_irq_enter(chip, desc);
510 irqmap = readl_relaxed(per_cpu_int_base + ARMADA_375_PPI_CAUSE);
511 cpuid = cpu_logical_map(smp_processor_id());
513 for_each_set_bit(irqn, &irqmap, BITS_PER_LONG) {
514 irqsrc = readl_relaxed(main_int_base +
515 ARMADA_370_XP_INT_SOURCE_CTL(irqn));
517 /* Check if the interrupt is not masked on current CPU.
518 * Test IRQ (0-1) and FIQ (8-9) mask bits.
520 if (!(irqsrc & ARMADA_370_XP_INT_IRQ_FIQ_MASK(cpuid)))
524 armada_370_xp_handle_msi_irq(NULL, true);
528 cascade_irq = irq_find_mapping(armada_370_xp_mpic_domain, irqn);
529 generic_handle_irq(cascade_irq);
532 chained_irq_exit(chip, desc);
535 static void __exception_irq_entry
536 armada_370_xp_handle_irq(struct pt_regs *regs)
541 irqstat = readl_relaxed(per_cpu_int_base +
542 ARMADA_370_XP_CPU_INTACK_OFFS);
543 irqnr = irqstat & 0x3FF;
549 handle_domain_irq(armada_370_xp_mpic_domain,
556 armada_370_xp_handle_msi_irq(regs, false);
563 ipimask = readl_relaxed(per_cpu_int_base +
564 ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS)
567 writel(~ipimask, per_cpu_int_base +
568 ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
570 /* Handle all pending doorbells */
571 for (ipinr = IPI_DOORBELL_START;
572 ipinr < IPI_DOORBELL_END; ipinr++) {
573 if (ipimask & (0x1 << ipinr))
574 handle_IPI(ipinr, regs);
583 static int armada_370_xp_mpic_suspend(void)
585 doorbell_mask_reg = readl(per_cpu_int_base +
586 ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
590 static void armada_370_xp_mpic_resume(void)
595 /* Re-enable interrupts */
596 nirqs = (readl(main_int_base + ARMADA_370_XP_INT_CONTROL) >> 2) & 0x3ff;
597 for (irq = 0; irq < nirqs; irq++) {
598 struct irq_data *data;
601 virq = irq_linear_revmap(armada_370_xp_mpic_domain, irq);
605 data = irq_get_irq_data(virq);
607 if (!is_percpu_irq(irq)) {
608 /* Non per-CPU interrupts */
609 writel(irq, per_cpu_int_base +
610 ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
611 if (!irqd_irq_disabled(data))
612 armada_370_xp_irq_unmask(data);
614 /* Per-CPU interrupts */
615 writel(irq, main_int_base +
616 ARMADA_370_XP_INT_SET_ENABLE_OFFS);
619 * Re-enable on the current CPU,
620 * armada_xp_mpic_reenable_percpu() will take
621 * care of secondary CPUs when they come up.
623 if (irq_percpu_is_enabled(virq))
624 armada_370_xp_irq_unmask(data);
628 /* Reconfigure doorbells for IPIs and MSIs */
629 writel(doorbell_mask_reg,
630 per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
631 if (doorbell_mask_reg & IPI_DOORBELL_MASK)
632 writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
633 if (doorbell_mask_reg & PCI_MSI_DOORBELL_MASK)
634 writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
637 static struct syscore_ops armada_370_xp_mpic_syscore_ops = {
638 .suspend = armada_370_xp_mpic_suspend,
639 .resume = armada_370_xp_mpic_resume,
642 static int __init armada_370_xp_mpic_of_init(struct device_node *node,
643 struct device_node *parent)
645 struct resource main_int_res, per_cpu_int_res;
649 BUG_ON(of_address_to_resource(node, 0, &main_int_res));
650 BUG_ON(of_address_to_resource(node, 1, &per_cpu_int_res));
652 BUG_ON(!request_mem_region(main_int_res.start,
653 resource_size(&main_int_res),
655 BUG_ON(!request_mem_region(per_cpu_int_res.start,
656 resource_size(&per_cpu_int_res),
659 main_int_base = ioremap(main_int_res.start,
660 resource_size(&main_int_res));
661 BUG_ON(!main_int_base);
663 per_cpu_int_base = ioremap(per_cpu_int_res.start,
664 resource_size(&per_cpu_int_res));
665 BUG_ON(!per_cpu_int_base);
667 control = readl(main_int_base + ARMADA_370_XP_INT_CONTROL);
668 nr_irqs = (control >> 2) & 0x3ff;
670 for (i = 0; i < nr_irqs; i++)
671 writel(i, main_int_base + ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS);
673 armada_370_xp_mpic_domain =
674 irq_domain_add_linear(node, nr_irqs,
675 &armada_370_xp_mpic_irq_ops, NULL);
676 BUG_ON(!armada_370_xp_mpic_domain);
677 irq_domain_update_bus_token(armada_370_xp_mpic_domain, DOMAIN_BUS_WIRED);
679 /* Setup for the boot CPU */
680 armada_xp_mpic_perf_init();
681 armada_xp_mpic_smp_cpu_init();
683 armada_370_xp_msi_init(node, main_int_res.start);
685 parent_irq = irq_of_parse_and_map(node, 0);
686 if (parent_irq <= 0) {
687 irq_set_default_host(armada_370_xp_mpic_domain);
688 set_handle_irq(armada_370_xp_handle_irq);
690 set_smp_cross_call(armada_mpic_send_doorbell);
691 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_ARMADA_XP_STARTING,
692 "irqchip/armada/ipi:starting",
693 armada_xp_mpic_starting_cpu, NULL);
697 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_ARMADA_XP_STARTING,
698 "irqchip/armada/cascade:starting",
699 mpic_cascaded_starting_cpu, NULL);
701 irq_set_chained_handler(parent_irq,
702 armada_370_xp_mpic_handle_cascade_irq);
705 register_syscore_ops(&armada_370_xp_mpic_syscore_ops);
710 IRQCHIP_DECLARE(armada_370_xp_mpic, "marvell,mpic", armada_370_xp_mpic_of_init);