1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Marvell Armada 370 and Armada XP SoC IRQ handling
4 *
5 * Copyright (C) 2012 Marvell
6 *
7 * Lior Amsalem <alior@marvell.com>
8 * Gregory CLEMENT <gregory.clement@free-electrons.com>
9 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
10 * Ben Dooks <ben.dooks@codethink.co.uk>
11 */
12
13#include <linux/bitfield.h>
14#include <linux/bits.h>
15#include <linux/err.h>
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>
24#include <linux/io.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 <linux/types.h>
33#include <asm/mach/arch.h>
34#include <asm/exception.h>
35#include <asm/smp_plat.h>
36#include <asm/mach/irq.h>
37
38/*
39 * Overall diagram of the Armada XP interrupt controller:
40 *
41 * To CPU 0 To CPU 1
42 *
43 * /\ /\
44 * || ||
45 * +---------------+ +---------------+
46 * | | | |
47 * | per-CPU | | per-CPU |
48 * | mask/unmask | | mask/unmask |
49 * | CPU0 | | CPU1 |
50 * | | | |
51 * +---------------+ +---------------+
52 * /\ /\
53 * || ||
54 * \\_______________________//
55 * ||
56 * +-------------------+
57 * | |
58 * | Global interrupt |
59 * | mask/unmask |
60 * | |
61 * +-------------------+
62 * /\
63 * ||
64 * interrupt from
65 * device
66 *
67 * The "global interrupt mask/unmask" is modified using the
68 * MPIC_INT_SET_ENABLE and MPIC_INT_CLEAR_ENABLE
69 * registers, which are relative to "mpic->base".
70 *
71 * The "per-CPU mask/unmask" is modified using the MPIC_INT_SET_MASK
72 * and MPIC_INT_CLEAR_MASK registers, which are relative to
73 * "mpic->per_cpu". This base address points to a special address,
74 * which automatically accesses the registers of the current CPU.
75 *
76 * The per-CPU mask/unmask can also be adjusted using the global
77 * per-interrupt MPIC_INT_SOURCE_CTL register, which we use to
78 * configure interrupt affinity.
79 *
80 * Due to this model, all interrupts need to be mask/unmasked at two
81 * different levels: at the global level and at the per-CPU level.
82 *
83 * This driver takes the following approach to deal with this:
84 *
85 * - For global interrupts:
86 *
87 * At ->map() time, a global interrupt is unmasked at the per-CPU
88 * mask/unmask level. It is therefore unmasked at this level for
89 * the current CPU, running the ->map() code. This allows to have
90 * the interrupt unmasked at this level in non-SMP
91 * configurations. In SMP configurations, the ->set_affinity()
92 * callback is called, which using the MPIC_INT_SOURCE_CTL()
93 * readjusts the per-CPU mask/unmask for the interrupt.
94 *
95 * The ->mask() and ->unmask() operations only mask/unmask the
96 * interrupt at the "global" level.
97 *
98 * So, a global interrupt is enabled at the per-CPU level as soon
99 * as it is mapped. At run time, the masking/unmasking takes place
100 * at the global level.
101 *
102 * - For per-CPU interrupts
103 *
104 * At ->map() time, a per-CPU interrupt is unmasked at the global
105 * mask/unmask level.
106 *
107 * The ->mask() and ->unmask() operations mask/unmask the interrupt
108 * at the per-CPU level.
109 *
110 * So, a per-CPU interrupt is enabled at the global level as soon
111 * as it is mapped. At run time, the masking/unmasking takes place
112 * at the per-CPU level.
113 */
114
115/* Registers relative to mpic->base */
116#define MPIC_INT_CONTROL 0x00
117#define MPIC_INT_CONTROL_NUMINT_MASK GENMASK(12, 2)
118#define MPIC_SW_TRIG_INT 0x04
119#define MPIC_INT_SET_ENABLE 0x30
120#define MPIC_INT_CLEAR_ENABLE 0x34
121#define MPIC_INT_SOURCE_CTL(hwirq) (0x100 + (hwirq) * 4)
122#define MPIC_INT_SOURCE_CPU_MASK GENMASK(3, 0)
123#define MPIC_INT_IRQ_FIQ_MASK(cpuid) ((BIT(0) | BIT(8)) << (cpuid))
124
125/* Registers relative to mpic->per_cpu */
126#define MPIC_IN_DRBEL_CAUSE 0x08
127#define MPIC_IN_DRBEL_MASK 0x0c
128#define MPIC_PPI_CAUSE 0x10
129#define MPIC_CPU_INTACK 0x44
130#define MPIC_CPU_INTACK_IID_MASK GENMASK(9, 0)
131#define MPIC_INT_SET_MASK 0x48
132#define MPIC_INT_CLEAR_MASK 0x4C
133#define MPIC_INT_FABRIC_MASK 0x54
134#define MPIC_INT_CAUSE_PERF(cpu) BIT(cpu)
135
136#define MPIC_PER_CPU_IRQS_NR 29
137
138/* IPI and MSI interrupt definitions for IPI platforms */
139#define IPI_DOORBELL_NR 8
140#define IPI_DOORBELL_MASK GENMASK(7, 0)
141#define PCI_MSI_DOORBELL_START 16
142#define PCI_MSI_DOORBELL_NR 16
143#define PCI_MSI_DOORBELL_MASK GENMASK(31, 16)
144
145/* MSI interrupt definitions for non-IPI platforms */
146#define PCI_MSI_FULL_DOORBELL_START 0
147#define PCI_MSI_FULL_DOORBELL_NR 32
148#define PCI_MSI_FULL_DOORBELL_MASK GENMASK(31, 0)
149#define PCI_MSI_FULL_DOORBELL_SRC0_MASK GENMASK(15, 0)
150#define PCI_MSI_FULL_DOORBELL_SRC1_MASK GENMASK(31, 16)
151
152/**
153 * struct mpic - MPIC private data structure
154 * @base: MPIC registers base address
155 * @per_cpu: per-CPU registers base address
156 * @parent_irq: parent IRQ if MPIC is not top-level interrupt controller
157 * @domain: MPIC main interrupt domain
158 * @ipi_domain: IPI domain
159 * @msi_domain: MSI domain
160 * @msi_inner_domain: MSI inner domain
161 * @msi_used: bitmap of used MSI numbers
162 * @msi_lock: mutex serializing access to @msi_used
163 * @msi_doorbell_addr: physical address of MSI doorbell register
164 * @msi_doorbell_mask: mask of available doorbell bits for MSIs (either PCI_MSI_DOORBELL_MASK or
165 * PCI_MSI_FULL_DOORBELL_MASK)
166 * @msi_doorbell_start: first set bit in @msi_doorbell_mask
167 * @msi_doorbell_size: number of set bits in @msi_doorbell_mask
168 * @doorbell_mask: doorbell mask of MSIs and IPIs, stored on suspend, restored on resume
169 */
170struct mpic {
171 void __iomem *base;
172 void __iomem *per_cpu;
173 int parent_irq;
174 struct irq_domain *domain;
175#ifdef CONFIG_SMP
176 struct irq_domain *ipi_domain;
177#endif
178#ifdef CONFIG_PCI_MSI
179 struct irq_domain *msi_domain;
180 struct irq_domain *msi_inner_domain;
181 DECLARE_BITMAP(msi_used, PCI_MSI_FULL_DOORBELL_NR);
182 struct mutex msi_lock;
183 phys_addr_t msi_doorbell_addr;
184 u32 msi_doorbell_mask;
185 unsigned int msi_doorbell_start, msi_doorbell_size;
186#endif
187 u32 doorbell_mask;
188};
189
190static struct mpic *mpic_data __ro_after_init;
191
192static inline bool mpic_is_ipi_available(struct mpic *mpic)
193{
194 /*
195 * We distinguish IPI availability in the IC by the IC not having a
196 * parent irq defined. If a parent irq is defined, there is a parent
197 * interrupt controller (e.g. GIC) that takes care of inter-processor
198 * interrupts.
199 */
200 return mpic->parent_irq <= 0;
201}
202
203static inline bool mpic_is_percpu_irq(irq_hw_number_t hwirq)
204{
205 return hwirq < MPIC_PER_CPU_IRQS_NR;
206}
207
208/*
209 * In SMP mode:
210 * For shared global interrupts, mask/unmask global enable bit
211 * For CPU interrupts, mask/unmask the calling CPU's bit
212 */
213static void mpic_irq_mask(struct irq_data *d)
214{
215 struct mpic *mpic = irq_data_get_irq_chip_data(d);
216 irq_hw_number_t hwirq = irqd_to_hwirq(d);
217
218 if (!mpic_is_percpu_irq(hwirq))
219 writel(val: hwirq, addr: mpic->base + MPIC_INT_CLEAR_ENABLE);
220 else
221 writel(val: hwirq, addr: mpic->per_cpu + MPIC_INT_SET_MASK);
222}
223
224static void mpic_irq_unmask(struct irq_data *d)
225{
226 struct mpic *mpic = irq_data_get_irq_chip_data(d);
227 irq_hw_number_t hwirq = irqd_to_hwirq(d);
228
229 if (!mpic_is_percpu_irq(hwirq))
230 writel(val: hwirq, addr: mpic->base + MPIC_INT_SET_ENABLE);
231 else
232 writel(val: hwirq, addr: mpic->per_cpu + MPIC_INT_CLEAR_MASK);
233}
234
235#ifdef CONFIG_PCI_MSI
236
237static struct irq_chip mpic_msi_irq_chip = {
238 .name = "MPIC MSI",
239 .irq_mask = pci_msi_mask_irq,
240 .irq_unmask = pci_msi_unmask_irq,
241};
242
243static struct msi_domain_info mpic_msi_domain_info = {
244 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
245 MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX),
246 .chip = &mpic_msi_irq_chip,
247};
248
249static void mpic_compose_msi_msg(struct irq_data *d, struct msi_msg *msg)
250{
251 unsigned int cpu = cpumask_first(srcp: irq_data_get_effective_affinity_mask(d));
252 struct mpic *mpic = irq_data_get_irq_chip_data(d);
253
254 msg->address_lo = lower_32_bits(mpic->msi_doorbell_addr);
255 msg->address_hi = upper_32_bits(mpic->msi_doorbell_addr);
256 msg->data = BIT(cpu + 8) | (d->hwirq + mpic->msi_doorbell_start);
257}
258
259static int mpic_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force)
260{
261 unsigned int cpu;
262
263 if (!force)
264 cpu = cpumask_any_and(mask, cpu_online_mask);
265 else
266 cpu = cpumask_first(srcp: mask);
267
268 if (cpu >= nr_cpu_ids)
269 return -EINVAL;
270
271 irq_data_update_effective_affinity(d, cpumask_of(cpu));
272
273 return IRQ_SET_MASK_OK;
274}
275
276static struct irq_chip mpic_msi_bottom_irq_chip = {
277 .name = "MPIC MSI",
278 .irq_compose_msi_msg = mpic_compose_msi_msg,
279 .irq_set_affinity = mpic_msi_set_affinity,
280};
281
282static int mpic_msi_alloc(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs,
283 void *args)
284{
285 struct mpic *mpic = domain->host_data;
286 int hwirq;
287
288 mutex_lock(&mpic->msi_lock);
289 hwirq = bitmap_find_free_region(bitmap: mpic->msi_used, bits: mpic->msi_doorbell_size,
290 order_base_2(nr_irqs));
291 mutex_unlock(lock: &mpic->msi_lock);
292
293 if (hwirq < 0)
294 return -ENOSPC;
295
296 for (unsigned int i = 0; i < nr_irqs; i++) {
297 irq_domain_set_info(domain, virq: virq + i, hwirq: hwirq + i,
298 chip: &mpic_msi_bottom_irq_chip,
299 chip_data: domain->host_data, handler: handle_simple_irq,
300 NULL, NULL);
301 }
302
303 return 0;
304}
305
306static void mpic_msi_free(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs)
307{
308 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
309 struct mpic *mpic = domain->host_data;
310
311 mutex_lock(&mpic->msi_lock);
312 bitmap_release_region(bitmap: mpic->msi_used, pos: d->hwirq, order_base_2(nr_irqs));
313 mutex_unlock(lock: &mpic->msi_lock);
314}
315
316static const struct irq_domain_ops mpic_msi_domain_ops = {
317 .alloc = mpic_msi_alloc,
318 .free = mpic_msi_free,
319};
320
321static void mpic_msi_reenable_percpu(struct mpic *mpic)
322{
323 u32 reg;
324
325 /* Enable MSI doorbell mask and combined cpu local interrupt */
326 reg = readl(addr: mpic->per_cpu + MPIC_IN_DRBEL_MASK);
327 reg |= mpic->msi_doorbell_mask;
328 writel(val: reg, addr: mpic->per_cpu + MPIC_IN_DRBEL_MASK);
329
330 /* Unmask local doorbell interrupt */
331 writel(val: 1, addr: mpic->per_cpu + MPIC_INT_CLEAR_MASK);
332}
333
334static int __init mpic_msi_init(struct mpic *mpic, struct device_node *node,
335 phys_addr_t main_int_phys_base)
336{
337 mpic->msi_doorbell_addr = main_int_phys_base + MPIC_SW_TRIG_INT;
338
339 mutex_init(&mpic->msi_lock);
340
341 if (mpic_is_ipi_available(mpic)) {
342 mpic->msi_doorbell_start = PCI_MSI_DOORBELL_START;
343 mpic->msi_doorbell_size = PCI_MSI_DOORBELL_NR;
344 mpic->msi_doorbell_mask = PCI_MSI_DOORBELL_MASK;
345 } else {
346 mpic->msi_doorbell_start = PCI_MSI_FULL_DOORBELL_START;
347 mpic->msi_doorbell_size = PCI_MSI_FULL_DOORBELL_NR;
348 mpic->msi_doorbell_mask = PCI_MSI_FULL_DOORBELL_MASK;
349 }
350
351 mpic->msi_inner_domain = irq_domain_create_linear(NULL, size: mpic->msi_doorbell_size,
352 ops: &mpic_msi_domain_ops, host_data: mpic);
353 if (!mpic->msi_inner_domain)
354 return -ENOMEM;
355
356 mpic->msi_domain = pci_msi_create_irq_domain(of_fwnode_handle(node), info: &mpic_msi_domain_info,
357 parent: mpic->msi_inner_domain);
358 if (!mpic->msi_domain) {
359 irq_domain_remove(domain: mpic->msi_inner_domain);
360 return -ENOMEM;
361 }
362
363 mpic_msi_reenable_percpu(mpic);
364
365 /* Unmask low 16 MSI irqs on non-IPI platforms */
366 if (!mpic_is_ipi_available(mpic))
367 writel(val: 0, addr: mpic->per_cpu + MPIC_INT_CLEAR_MASK);
368
369 return 0;
370}
371#else
372static __maybe_unused void mpic_msi_reenable_percpu(struct mpic *mpic) {}
373
374static inline int mpic_msi_init(struct mpic *mpic, struct device_node *node,
375 phys_addr_t main_int_phys_base)
376{
377 return 0;
378}
379#endif
380
381static void mpic_perf_init(struct mpic *mpic)
382{
383 u32 cpuid;
384
385 /*
386 * This Performance Counter Overflow interrupt is specific for
387 * Armada 370 and XP. It is not available on Armada 375, 38x and 39x.
388 */
389 if (!of_machine_is_compatible(compat: "marvell,armada-370-xp"))
390 return;
391
392 cpuid = cpu_logical_map(smp_processor_id());
393
394 /* Enable Performance Counter Overflow interrupts */
395 writel(MPIC_INT_CAUSE_PERF(cpuid), addr: mpic->per_cpu + MPIC_INT_FABRIC_MASK);
396}
397
398#ifdef CONFIG_SMP
399static void mpic_ipi_mask(struct irq_data *d)
400{
401 struct mpic *mpic = irq_data_get_irq_chip_data(d);
402 u32 reg;
403
404 reg = readl(addr: mpic->per_cpu + MPIC_IN_DRBEL_MASK);
405 reg &= ~BIT(d->hwirq);
406 writel(val: reg, addr: mpic->per_cpu + MPIC_IN_DRBEL_MASK);
407}
408
409static void mpic_ipi_unmask(struct irq_data *d)
410{
411 struct mpic *mpic = irq_data_get_irq_chip_data(d);
412 u32 reg;
413
414 reg = readl(addr: mpic->per_cpu + MPIC_IN_DRBEL_MASK);
415 reg |= BIT(d->hwirq);
416 writel(val: reg, addr: mpic->per_cpu + MPIC_IN_DRBEL_MASK);
417}
418
419static void mpic_ipi_send_mask(struct irq_data *d, const struct cpumask *mask)
420{
421 struct mpic *mpic = irq_data_get_irq_chip_data(d);
422 unsigned int cpu;
423 u32 map = 0;
424
425 /* Convert our logical CPU mask into a physical one. */
426 for_each_cpu(cpu, mask)
427 map |= BIT(cpu_logical_map(cpu));
428
429 /*
430 * Ensure that stores to Normal memory are visible to the
431 * other CPUs before issuing the IPI.
432 */
433 dsb();
434
435 /* submit softirq */
436 writel(val: (map << 8) | d->hwirq, addr: mpic->base + MPIC_SW_TRIG_INT);
437}
438
439static void mpic_ipi_ack(struct irq_data *d)
440{
441 struct mpic *mpic = irq_data_get_irq_chip_data(d);
442
443 writel(val: ~BIT(d->hwirq), addr: mpic->per_cpu + MPIC_IN_DRBEL_CAUSE);
444}
445
446static struct irq_chip mpic_ipi_irqchip = {
447 .name = "IPI",
448 .irq_ack = mpic_ipi_ack,
449 .irq_mask = mpic_ipi_mask,
450 .irq_unmask = mpic_ipi_unmask,
451 .ipi_send_mask = mpic_ipi_send_mask,
452};
453
454static int mpic_ipi_alloc(struct irq_domain *d, unsigned int virq,
455 unsigned int nr_irqs, void *args)
456{
457 for (unsigned int i = 0; i < nr_irqs; i++) {
458 irq_set_percpu_devid(irq: virq + i);
459 irq_domain_set_info(domain: d, virq: virq + i, hwirq: i, chip: &mpic_ipi_irqchip, chip_data: d->host_data,
460 handler: handle_percpu_devid_irq, NULL, NULL);
461 }
462
463 return 0;
464}
465
466static void mpic_ipi_free(struct irq_domain *d, unsigned int virq,
467 unsigned int nr_irqs)
468{
469 /* Not freeing IPIs */
470}
471
472static const struct irq_domain_ops mpic_ipi_domain_ops = {
473 .alloc = mpic_ipi_alloc,
474 .free = mpic_ipi_free,
475};
476
477static void mpic_ipi_resume(struct mpic *mpic)
478{
479 for (irq_hw_number_t i = 0; i < IPI_DOORBELL_NR; i++) {
480 unsigned int virq = irq_find_mapping(domain: mpic->ipi_domain, hwirq: i);
481 struct irq_data *d;
482
483 if (!virq || !irq_percpu_is_enabled(irq: virq))
484 continue;
485
486 d = irq_domain_get_irq_data(domain: mpic->ipi_domain, virq);
487 mpic_ipi_unmask(d);
488 }
489}
490
491static int __init mpic_ipi_init(struct mpic *mpic, struct device_node *node)
492{
493 int base_ipi;
494
495 mpic->ipi_domain = irq_domain_create_linear(of_fwnode_handle(node), IPI_DOORBELL_NR,
496 ops: &mpic_ipi_domain_ops, host_data: mpic);
497 if (WARN_ON(!mpic->ipi_domain))
498 return -ENOMEM;
499
500 irq_domain_update_bus_token(domain: mpic->ipi_domain, bus_token: DOMAIN_BUS_IPI);
501 base_ipi = irq_domain_alloc_irqs(domain: mpic->ipi_domain, IPI_DOORBELL_NR, NUMA_NO_NODE, NULL);
502 if (WARN_ON(!base_ipi))
503 return -ENOMEM;
504
505 set_smp_ipi_range(base_ipi, IPI_DOORBELL_NR);
506
507 return 0;
508}
509
510static int mpic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, bool force)
511{
512 struct mpic *mpic = irq_data_get_irq_chip_data(d);
513 irq_hw_number_t hwirq = irqd_to_hwirq(d);
514 unsigned int cpu;
515
516 /* Select a single core from the affinity mask which is online */
517 cpu = cpumask_any_and(mask_val, cpu_online_mask);
518
519 atomic_io_modify(mpic->base + MPIC_INT_SOURCE_CTL(hwirq),
520 MPIC_INT_SOURCE_CPU_MASK, BIT(cpu_logical_map(cpu)));
521
522 irq_data_update_effective_affinity(d, cpumask_of(cpu));
523
524 return IRQ_SET_MASK_OK;
525}
526
527static void mpic_smp_cpu_init(struct mpic *mpic)
528{
529 for (irq_hw_number_t i = 0; i < mpic->domain->hwirq_max; i++)
530 writel(val: i, addr: mpic->per_cpu + MPIC_INT_SET_MASK);
531
532 if (!mpic_is_ipi_available(mpic))
533 return;
534
535 /* Disable all IPIs */
536 writel(val: 0, addr: mpic->per_cpu + MPIC_IN_DRBEL_MASK);
537
538 /* Clear pending IPIs */
539 writel(val: 0, addr: mpic->per_cpu + MPIC_IN_DRBEL_CAUSE);
540
541 /* Unmask IPI interrupt */
542 writel(val: 0, addr: mpic->per_cpu + MPIC_INT_CLEAR_MASK);
543}
544
545static void mpic_reenable_percpu(struct mpic *mpic)
546{
547 /* Re-enable per-CPU interrupts that were enabled before suspend */
548 for (irq_hw_number_t i = 0; i < MPIC_PER_CPU_IRQS_NR; i++) {
549 unsigned int virq = irq_find_mapping(domain: mpic->domain, hwirq: i);
550 struct irq_data *d;
551
552 if (!virq || !irq_percpu_is_enabled(irq: virq))
553 continue;
554
555 d = irq_get_irq_data(irq: virq);
556 mpic_irq_unmask(d);
557 }
558
559 if (mpic_is_ipi_available(mpic))
560 mpic_ipi_resume(mpic);
561
562 mpic_msi_reenable_percpu(mpic);
563}
564
565static int mpic_starting_cpu(unsigned int cpu)
566{
567 struct mpic *mpic = irq_get_default_domain()->host_data;
568
569 mpic_perf_init(mpic);
570 mpic_smp_cpu_init(mpic);
571 mpic_reenable_percpu(mpic);
572
573 return 0;
574}
575
576static int mpic_cascaded_starting_cpu(unsigned int cpu)
577{
578 struct mpic *mpic = mpic_data;
579
580 mpic_perf_init(mpic);
581 mpic_reenable_percpu(mpic);
582 enable_percpu_irq(irq: mpic->parent_irq, type: IRQ_TYPE_NONE);
583
584 return 0;
585}
586#else
587static void mpic_smp_cpu_init(struct mpic *mpic) {}
588static void mpic_ipi_resume(struct mpic *mpic) {}
589#endif
590
591static struct irq_chip mpic_irq_chip = {
592 .name = "MPIC",
593 .irq_mask = mpic_irq_mask,
594 .irq_mask_ack = mpic_irq_mask,
595 .irq_unmask = mpic_irq_unmask,
596#ifdef CONFIG_SMP
597 .irq_set_affinity = mpic_set_affinity,
598#endif
599 .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND,
600};
601
602static int mpic_irq_map(struct irq_domain *domain, unsigned int virq, irq_hw_number_t hwirq)
603{
604 struct mpic *mpic = domain->host_data;
605
606 /* IRQs 0 and 1 cannot be mapped, they are handled internally */
607 if (hwirq <= 1)
608 return -EINVAL;
609
610 irq_set_chip_data(irq: virq, data: mpic);
611
612 mpic_irq_mask(d: irq_get_irq_data(irq: virq));
613 if (!mpic_is_percpu_irq(hwirq))
614 writel(val: hwirq, addr: mpic->per_cpu + MPIC_INT_CLEAR_MASK);
615 else
616 writel(val: hwirq, addr: mpic->base + MPIC_INT_SET_ENABLE);
617 irq_set_status_flags(irq: virq, set: IRQ_LEVEL);
618
619 if (mpic_is_percpu_irq(hwirq)) {
620 irq_set_percpu_devid(irq: virq);
621 irq_set_chip_and_handler(irq: virq, chip: &mpic_irq_chip, handle: handle_percpu_devid_irq);
622 } else {
623 irq_set_chip_and_handler(irq: virq, chip: &mpic_irq_chip, handle: handle_level_irq);
624 irqd_set_single_target(d: irq_desc_get_irq_data(desc: irq_to_desc(irq: virq)));
625 }
626 irq_set_probe(irq: virq);
627 return 0;
628}
629
630static const struct irq_domain_ops mpic_irq_ops = {
631 .map = mpic_irq_map,
632 .xlate = irq_domain_xlate_onecell,
633};
634
635#ifdef CONFIG_PCI_MSI
636static void mpic_handle_msi_irq(struct mpic *mpic)
637{
638 unsigned long cause;
639 unsigned int i;
640
641 cause = readl_relaxed(mpic->per_cpu + MPIC_IN_DRBEL_CAUSE);
642 cause &= mpic->msi_doorbell_mask;
643 writel(val: ~cause, addr: mpic->per_cpu + MPIC_IN_DRBEL_CAUSE);
644
645 for_each_set_bit(i, &cause, BITS_PER_LONG)
646 generic_handle_domain_irq(domain: mpic->msi_inner_domain, hwirq: i - mpic->msi_doorbell_start);
647}
648#else
649static void mpic_handle_msi_irq(struct mpic *mpic) {}
650#endif
651
652#ifdef CONFIG_SMP
653static void mpic_handle_ipi_irq(struct mpic *mpic)
654{
655 unsigned long cause;
656 irq_hw_number_t i;
657
658 cause = readl_relaxed(mpic->per_cpu + MPIC_IN_DRBEL_CAUSE);
659 cause &= IPI_DOORBELL_MASK;
660
661 for_each_set_bit(i, &cause, IPI_DOORBELL_NR)
662 generic_handle_domain_irq(domain: mpic->ipi_domain, hwirq: i);
663}
664#else
665static inline void mpic_handle_ipi_irq(struct mpic *mpic) {}
666#endif
667
668static void mpic_handle_cascade_irq(struct irq_desc *desc)
669{
670 struct mpic *mpic = irq_desc_get_handler_data(desc);
671 struct irq_chip *chip = irq_desc_get_chip(desc);
672 unsigned long cause;
673 u32 irqsrc, cpuid;
674 irq_hw_number_t i;
675
676 chained_irq_enter(chip, desc);
677
678 cause = readl_relaxed(mpic->per_cpu + MPIC_PPI_CAUSE);
679 cpuid = cpu_logical_map(smp_processor_id());
680
681 for_each_set_bit(i, &cause, MPIC_PER_CPU_IRQS_NR) {
682 irqsrc = readl_relaxed(mpic->base + MPIC_INT_SOURCE_CTL(i));
683
684 /* Check if the interrupt is not masked on current CPU.
685 * Test IRQ (0-1) and FIQ (8-9) mask bits.
686 */
687 if (!(irqsrc & MPIC_INT_IRQ_FIQ_MASK(cpuid)))
688 continue;
689
690 if (i == 0 || i == 1) {
691 mpic_handle_msi_irq(mpic);
692 continue;
693 }
694
695 generic_handle_domain_irq(domain: mpic->domain, hwirq: i);
696 }
697
698 chained_irq_exit(chip, desc);
699}
700
701static void __exception_irq_entry mpic_handle_irq(struct pt_regs *regs)
702{
703 struct mpic *mpic = irq_get_default_domain()->host_data;
704 irq_hw_number_t i;
705 u32 irqstat;
706
707 do {
708 irqstat = readl_relaxed(mpic->per_cpu + MPIC_CPU_INTACK);
709 i = FIELD_GET(MPIC_CPU_INTACK_IID_MASK, irqstat);
710
711 if (i > 1022)
712 break;
713
714 if (i > 1)
715 generic_handle_domain_irq(mpic->domain, i);
716
717 /* MSI handling */
718 if (i == 1)
719 mpic_handle_msi_irq(mpic);
720
721 /* IPI Handling */
722 if (i == 0)
723 mpic_handle_ipi_irq(mpic);
724 } while (1);
725}
726
727static int mpic_suspend(void)
728{
729 struct mpic *mpic = mpic_data;
730
731 mpic->doorbell_mask = readl(addr: mpic->per_cpu + MPIC_IN_DRBEL_MASK);
732
733 return 0;
734}
735
736static void mpic_resume(void)
737{
738 struct mpic *mpic = mpic_data;
739 bool src0, src1;
740
741 /* Re-enable interrupts */
742 for (irq_hw_number_t i = 0; i < mpic->domain->hwirq_max; i++) {
743 unsigned int virq = irq_find_mapping(domain: mpic->domain, hwirq: i);
744 struct irq_data *d;
745
746 if (!virq)
747 continue;
748
749 d = irq_get_irq_data(irq: virq);
750
751 if (!mpic_is_percpu_irq(hwirq: i)) {
752 /* Non per-CPU interrupts */
753 writel(val: i, addr: mpic->per_cpu + MPIC_INT_CLEAR_MASK);
754 if (!irqd_irq_disabled(d))
755 mpic_irq_unmask(d);
756 } else {
757 /* Per-CPU interrupts */
758 writel(val: i, addr: mpic->base + MPIC_INT_SET_ENABLE);
759
760 /*
761 * Re-enable on the current CPU, mpic_reenable_percpu()
762 * will take care of secondary CPUs when they come up.
763 */
764 if (irq_percpu_is_enabled(irq: virq))
765 mpic_irq_unmask(d);
766 }
767 }
768
769 /* Reconfigure doorbells for IPIs and MSIs */
770 writel(val: mpic->doorbell_mask, addr: mpic->per_cpu + MPIC_IN_DRBEL_MASK);
771
772 if (mpic_is_ipi_available(mpic)) {
773 src0 = mpic->doorbell_mask & IPI_DOORBELL_MASK;
774 src1 = mpic->doorbell_mask & PCI_MSI_DOORBELL_MASK;
775 } else {
776 src0 = mpic->doorbell_mask & PCI_MSI_FULL_DOORBELL_SRC0_MASK;
777 src1 = mpic->doorbell_mask & PCI_MSI_FULL_DOORBELL_SRC1_MASK;
778 }
779
780 if (src0)
781 writel(val: 0, addr: mpic->per_cpu + MPIC_INT_CLEAR_MASK);
782 if (src1)
783 writel(val: 1, addr: mpic->per_cpu + MPIC_INT_CLEAR_MASK);
784
785 if (mpic_is_ipi_available(mpic))
786 mpic_ipi_resume(mpic);
787}
788
789static struct syscore_ops mpic_syscore_ops = {
790 .suspend = mpic_suspend,
791 .resume = mpic_resume,
792};
793
794static int __init mpic_map_region(struct device_node *np, int index,
795 void __iomem **base, phys_addr_t *phys_base)
796{
797 struct resource res;
798 int err;
799
800 err = of_address_to_resource(dev: np, index, r: &res);
801 if (WARN_ON(err))
802 goto fail;
803
804 if (WARN_ON(!request_mem_region(res.start, resource_size(&res), np->full_name))) {
805 err = -EBUSY;
806 goto fail;
807 }
808
809 *base = ioremap(offset: res.start, size: resource_size(res: &res));
810 if (WARN_ON(!*base)) {
811 err = -ENOMEM;
812 goto fail;
813 }
814
815 if (phys_base)
816 *phys_base = res.start;
817
818 return 0;
819
820fail:
821 pr_err("%pOF: Unable to map resource %d: %pE\n", np, index, ERR_PTR(err));
822 return err;
823}
824
825static int __init mpic_of_init(struct device_node *node, struct device_node *parent)
826{
827 phys_addr_t phys_base;
828 unsigned int nr_irqs;
829 struct mpic *mpic;
830 int err;
831
832 mpic = kzalloc(sizeof(*mpic), GFP_KERNEL);
833 if (WARN_ON(!mpic))
834 return -ENOMEM;
835
836 mpic_data = mpic;
837
838 err = mpic_map_region(np: node, index: 0, base: &mpic->base, phys_base: &phys_base);
839 if (err)
840 return err;
841
842 err = mpic_map_region(np: node, index: 1, base: &mpic->per_cpu, NULL);
843 if (err)
844 return err;
845
846 nr_irqs = FIELD_GET(MPIC_INT_CONTROL_NUMINT_MASK, readl(mpic->base + MPIC_INT_CONTROL));
847
848 for (irq_hw_number_t i = 0; i < nr_irqs; i++)
849 writel(val: i, addr: mpic->base + MPIC_INT_CLEAR_ENABLE);
850
851 /*
852 * Initialize mpic->parent_irq before calling any other functions, since
853 * it is used to distinguish between IPI and non-IPI platforms.
854 */
855 mpic->parent_irq = irq_of_parse_and_map(node, index: 0);
856
857 /*
858 * On non-IPI platforms the driver currently supports only the per-CPU
859 * interrupts (the first 29 interrupts). See mpic_handle_cascade_irq().
860 */
861 if (!mpic_is_ipi_available(mpic))
862 nr_irqs = MPIC_PER_CPU_IRQS_NR;
863
864 mpic->domain = irq_domain_create_linear(of_fwnode_handle(node), size: nr_irqs, ops: &mpic_irq_ops, host_data: mpic);
865 if (!mpic->domain) {
866 pr_err("%pOF: Unable to add IRQ domain\n", node);
867 return -ENOMEM;
868 }
869
870 irq_domain_update_bus_token(domain: mpic->domain, bus_token: DOMAIN_BUS_WIRED);
871
872 /* Setup for the boot CPU */
873 mpic_perf_init(mpic);
874 mpic_smp_cpu_init(mpic);
875
876 err = mpic_msi_init(mpic, node, main_int_phys_base: phys_base);
877 if (err) {
878 pr_err("%pOF: Unable to initialize MSI domain\n", node);
879 return err;
880 }
881
882 if (mpic_is_ipi_available(mpic)) {
883 irq_set_default_domain(domain: mpic->domain);
884 set_handle_irq(mpic_handle_irq);
885#ifdef CONFIG_SMP
886 err = mpic_ipi_init(mpic, node);
887 if (err) {
888 pr_err("%pOF: Unable to initialize IPI domain\n", node);
889 return err;
890 }
891
892 cpuhp_setup_state_nocalls(state: CPUHP_AP_IRQ_ARMADA_XP_STARTING,
893 name: "irqchip/armada/ipi:starting",
894 startup: mpic_starting_cpu, NULL);
895#endif
896 } else {
897#ifdef CONFIG_SMP
898 cpuhp_setup_state_nocalls(state: CPUHP_AP_IRQ_ARMADA_XP_STARTING,
899 name: "irqchip/armada/cascade:starting",
900 startup: mpic_cascaded_starting_cpu, NULL);
901#endif
902 irq_set_chained_handler_and_data(irq: mpic->parent_irq,
903 handle: mpic_handle_cascade_irq, data: mpic);
904 }
905
906 register_syscore_ops(ops: &mpic_syscore_ops);
907
908 return 0;
909}
910
911IRQCHIP_DECLARE(marvell_mpic, "marvell,mpic", mpic_of_init);
912

source code of linux/drivers/irqchip/irq-armada-370-xp.c