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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Broadcom BCM7038 style Level 1 interrupt controller driver
4 *
5 * Copyright (C) 2014 Broadcom Corporation
6 * Author: Kevin Cernekee
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/bitops.h>
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/io.h>
16#include <linux/ioport.h>
17#include <linux/irq.h>
18#include <linux/irqdomain.h>
19#include <linux/module.h>
20#include <linux/of.h>
21#include <linux/of_irq.h>
22#include <linux/of_address.h>
23#include <linux/of_platform.h>
24#include <linux/platform_device.h>
25#include <linux/slab.h>
26#include <linux/smp.h>
27#include <linux/types.h>
28#include <linux/irqchip.h>
29#include <linux/irqchip/chained_irq.h>
30#include <linux/syscore_ops.h>
31#ifdef CONFIG_ARM
32#include <asm/smp_plat.h>
33#endif
34
35#define IRQS_PER_WORD 32
36#define REG_BYTES_PER_IRQ_WORD (sizeof(u32) * 4)
37#define MAX_WORDS 8
38
39struct bcm7038_l1_cpu;
40
41struct bcm7038_l1_chip {
42 raw_spinlock_t lock;
43 unsigned int n_words;
44 struct irq_domain *domain;
45 struct bcm7038_l1_cpu *cpus[NR_CPUS];
46#ifdef CONFIG_PM_SLEEP
47 struct list_head list;
48 u32 wake_mask[MAX_WORDS];
49#endif
50 u32 irq_fwd_mask[MAX_WORDS];
51 u8 affinity[MAX_WORDS * IRQS_PER_WORD];
52};
53
54struct bcm7038_l1_cpu {
55 void __iomem *map_base;
56 u32 mask_cache[];
57};
58
59/*
60 * STATUS/MASK_STATUS/MASK_SET/MASK_CLEAR are packed one right after another:
61 *
62 * 7038:
63 * 0x1000_1400: W0_STATUS
64 * 0x1000_1404: W1_STATUS
65 * 0x1000_1408: W0_MASK_STATUS
66 * 0x1000_140c: W1_MASK_STATUS
67 * 0x1000_1410: W0_MASK_SET
68 * 0x1000_1414: W1_MASK_SET
69 * 0x1000_1418: W0_MASK_CLEAR
70 * 0x1000_141c: W1_MASK_CLEAR
71 *
72 * 7445:
73 * 0xf03e_1500: W0_STATUS
74 * 0xf03e_1504: W1_STATUS
75 * 0xf03e_1508: W2_STATUS
76 * 0xf03e_150c: W3_STATUS
77 * 0xf03e_1510: W4_STATUS
78 * 0xf03e_1514: W0_MASK_STATUS
79 * 0xf03e_1518: W1_MASK_STATUS
80 * [...]
81 */
82
83static inline unsigned int reg_status(struct bcm7038_l1_chip *intc,
84 unsigned int word)
85{
86 return (0 * intc->n_words + word) * sizeof(u32);
87}
88
89static inline unsigned int reg_mask_status(struct bcm7038_l1_chip *intc,
90 unsigned int word)
91{
92 return (1 * intc->n_words + word) * sizeof(u32);
93}
94
95static inline unsigned int reg_mask_set(struct bcm7038_l1_chip *intc,
96 unsigned int word)
97{
98 return (2 * intc->n_words + word) * sizeof(u32);
99}
100
101static inline unsigned int reg_mask_clr(struct bcm7038_l1_chip *intc,
102 unsigned int word)
103{
104 return (3 * intc->n_words + word) * sizeof(u32);
105}
106
107static inline u32 l1_readl(void __iomem *reg)
108{
109 if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
110 return ioread32be(reg);
111 else
112 return readl(reg);
113}
114
115static inline void l1_writel(u32 val, void __iomem *reg)
116{
117 if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
118 iowrite32be(val, reg);
119 else
120 writel(val, reg);
121}
122
123static void bcm7038_l1_irq_handle(struct irq_desc *desc)
124{
125 struct bcm7038_l1_chip *intc = irq_desc_get_handler_data(desc);
126 struct bcm7038_l1_cpu *cpu;
127 struct irq_chip *chip = irq_desc_get_chip(desc);
128 unsigned int idx;
129
130#ifdef CONFIG_SMP
131 cpu = intc->cpus[cpu_logical_map(smp_processor_id())];
132#else
133 cpu = intc->cpus[0];
134#endif
135
136 chained_irq_enter(chip, desc);
137
138 for (idx = 0; idx < intc->n_words; idx++) {
139 int base = idx * IRQS_PER_WORD;
140 unsigned long pending, flags;
141 int hwirq;
142
143 raw_spin_lock_irqsave(&intc->lock, flags);
144 pending = l1_readl(cpu->map_base + reg_status(intc, idx)) &
145 ~cpu->mask_cache[idx];
146 raw_spin_unlock_irqrestore(&intc->lock, flags);
147
148 for_each_set_bit(hwirq, &pending, IRQS_PER_WORD) {
149 generic_handle_irq(irq_find_mapping(intc->domain,
150 base + hwirq));
151 }
152 }
153
154 chained_irq_exit(chip, desc);
155}
156
157static void __bcm7038_l1_unmask(struct irq_data *d, unsigned int cpu_idx)
158{
159 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
160 u32 word = d->hwirq / IRQS_PER_WORD;
161 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
162
163 intc->cpus[cpu_idx]->mask_cache[word] &= ~mask;
164 l1_writel(mask, intc->cpus[cpu_idx]->map_base +
165 reg_mask_clr(intc, word));
166}
167
168static void __bcm7038_l1_mask(struct irq_data *d, unsigned int cpu_idx)
169{
170 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
171 u32 word = d->hwirq / IRQS_PER_WORD;
172 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
173
174 intc->cpus[cpu_idx]->mask_cache[word] |= mask;
175 l1_writel(mask, intc->cpus[cpu_idx]->map_base +
176 reg_mask_set(intc, word));
177}
178
179static void bcm7038_l1_unmask(struct irq_data *d)
180{
181 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
182 unsigned long flags;
183
184 raw_spin_lock_irqsave(&intc->lock, flags);
185 __bcm7038_l1_unmask(d, intc->affinity[d->hwirq]);
186 raw_spin_unlock_irqrestore(&intc->lock, flags);
187}
188
189static void bcm7038_l1_mask(struct irq_data *d)
190{
191 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
192 unsigned long flags;
193
194 raw_spin_lock_irqsave(&intc->lock, flags);
195 __bcm7038_l1_mask(d, intc->affinity[d->hwirq]);
196 raw_spin_unlock_irqrestore(&intc->lock, flags);
197}
198
199static int bcm7038_l1_set_affinity(struct irq_data *d,
200 const struct cpumask *dest,
201 bool force)
202{
203 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
204 unsigned long flags;
205 irq_hw_number_t hw = d->hwirq;
206 u32 word = hw / IRQS_PER_WORD;
207 u32 mask = BIT(hw % IRQS_PER_WORD);
208 unsigned int first_cpu = cpumask_any_and(dest, cpu_online_mask);
209 bool was_disabled;
210
211 raw_spin_lock_irqsave(&intc->lock, flags);
212
213 was_disabled = !!(intc->cpus[intc->affinity[hw]]->mask_cache[word] &
214 mask);
215 __bcm7038_l1_mask(d, intc->affinity[hw]);
216 intc->affinity[hw] = first_cpu;
217 if (!was_disabled)
218 __bcm7038_l1_unmask(d, first_cpu);
219
220 raw_spin_unlock_irqrestore(&intc->lock, flags);
221 irq_data_update_effective_affinity(d, cpumask_of(first_cpu));
222
223 return 0;
224}
225
226#ifdef CONFIG_SMP
227static void bcm7038_l1_cpu_offline(struct irq_data *d)
228{
229 struct cpumask *mask = irq_data_get_affinity_mask(d);
230 int cpu = smp_processor_id();
231 cpumask_t new_affinity;
232
233 /* This CPU was not on the affinity mask */
234 if (!cpumask_test_cpu(cpu, mask))
235 return;
236
237 if (cpumask_weight(mask) > 1) {
238 /*
239 * Multiple CPU affinity, remove this CPU from the affinity
240 * mask
241 */
242 cpumask_copy(&new_affinity, mask);
243 cpumask_clear_cpu(cpu, &new_affinity);
244 } else {
245 /* Only CPU, put on the lowest online CPU */
246 cpumask_clear(&new_affinity);
247 cpumask_set_cpu(cpumask_first(cpu_online_mask), &new_affinity);
248 }
249 irq_set_affinity_locked(d, &new_affinity, false);
250}
251#endif
252
253static int __init bcm7038_l1_init_one(struct device_node *dn,
254 unsigned int idx,
255 struct bcm7038_l1_chip *intc)
256{
257 struct resource res;
258 resource_size_t sz;
259 struct bcm7038_l1_cpu *cpu;
260 unsigned int i, n_words, parent_irq;
261 int ret;
262
263 if (of_address_to_resource(dn, idx, &res))
264 return -EINVAL;
265 sz = resource_size(&res);
266 n_words = sz / REG_BYTES_PER_IRQ_WORD;
267
268 if (n_words > MAX_WORDS)
269 return -EINVAL;
270 else if (!intc->n_words)
271 intc->n_words = n_words;
272 else if (intc->n_words != n_words)
273 return -EINVAL;
274
275 ret = of_property_read_u32_array(dn , "brcm,int-fwd-mask",
276 intc->irq_fwd_mask, n_words);
277 if (ret != 0 && ret != -EINVAL) {
278 /* property exists but has the wrong number of words */
279 pr_err("invalid brcm,int-fwd-mask property\n");
280 return -EINVAL;
281 }
282
283 cpu = intc->cpus[idx] = kzalloc(sizeof(*cpu) + n_words * sizeof(u32),
284 GFP_KERNEL);
285 if (!cpu)
286 return -ENOMEM;
287
288 cpu->map_base = ioremap(res.start, sz);
289 if (!cpu->map_base)
290 return -ENOMEM;
291
292 for (i = 0; i < n_words; i++) {
293 l1_writel(~intc->irq_fwd_mask[i],
294 cpu->map_base + reg_mask_set(intc, i));
295 l1_writel(intc->irq_fwd_mask[i],
296 cpu->map_base + reg_mask_clr(intc, i));
297 cpu->mask_cache[i] = ~intc->irq_fwd_mask[i];
298 }
299
300 parent_irq = irq_of_parse_and_map(dn, idx);
301 if (!parent_irq) {
302 pr_err("failed to map parent interrupt %d\n", parent_irq);
303 return -EINVAL;
304 }
305
306 if (of_property_read_bool(dn, "brcm,irq-can-wake"))
307 enable_irq_wake(parent_irq);
308
309 irq_set_chained_handler_and_data(parent_irq, bcm7038_l1_irq_handle,
310 intc);
311
312 return 0;
313}
314
315#ifdef CONFIG_PM_SLEEP
316/*
317 * We keep a list of bcm7038_l1_chip used for suspend/resume. This hack is
318 * used because the struct chip_type suspend/resume hooks are not called
319 * unless chip_type is hooked onto a generic_chip. Since this driver does
320 * not use generic_chip, we need to manually hook our resume/suspend to
321 * syscore_ops.
322 */
323static LIST_HEAD(bcm7038_l1_intcs_list);
324static DEFINE_RAW_SPINLOCK(bcm7038_l1_intcs_lock);
325
326static int bcm7038_l1_suspend(void)
327{
328 struct bcm7038_l1_chip *intc;
329 int boot_cpu, word;
330 u32 val;
331
332 /* Wakeup interrupt should only come from the boot cpu */
333#ifdef CONFIG_SMP
334 boot_cpu = cpu_logical_map(0);
335#else
336 boot_cpu = 0;
337#endif
338
339 list_for_each_entry(intc, &bcm7038_l1_intcs_list, list) {
340 for (word = 0; word < intc->n_words; word++) {
341 val = intc->wake_mask[word] | intc->irq_fwd_mask[word];
342 l1_writel(~val,
343 intc->cpus[boot_cpu]->map_base + reg_mask_set(intc, word));
344 l1_writel(val,
345 intc->cpus[boot_cpu]->map_base + reg_mask_clr(intc, word));
346 }
347 }
348
349 return 0;
350}
351
352static void bcm7038_l1_resume(void)
353{
354 struct bcm7038_l1_chip *intc;
355 int boot_cpu, word;
356
357#ifdef CONFIG_SMP
358 boot_cpu = cpu_logical_map(0);
359#else
360 boot_cpu = 0;
361#endif
362
363 list_for_each_entry(intc, &bcm7038_l1_intcs_list, list) {
364 for (word = 0; word < intc->n_words; word++) {
365 l1_writel(intc->cpus[boot_cpu]->mask_cache[word],
366 intc->cpus[boot_cpu]->map_base + reg_mask_set(intc, word));
367 l1_writel(~intc->cpus[boot_cpu]->mask_cache[word],
368 intc->cpus[boot_cpu]->map_base + reg_mask_clr(intc, word));
369 }
370 }
371}
372
373static struct syscore_ops bcm7038_l1_syscore_ops = {
374 .suspend = bcm7038_l1_suspend,
375 .resume = bcm7038_l1_resume,
376};
377
378static int bcm7038_l1_set_wake(struct irq_data *d, unsigned int on)
379{
380 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
381 unsigned long flags;
382 u32 word = d->hwirq / IRQS_PER_WORD;
383 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
384
385 raw_spin_lock_irqsave(&intc->lock, flags);
386 if (on)
387 intc->wake_mask[word] |= mask;
388 else
389 intc->wake_mask[word] &= ~mask;
390 raw_spin_unlock_irqrestore(&intc->lock, flags);
391
392 return 0;
393}
394#endif
395
396static struct irq_chip bcm7038_l1_irq_chip = {
397 .name = "bcm7038-l1",
398 .irq_mask = bcm7038_l1_mask,
399 .irq_unmask = bcm7038_l1_unmask,
400 .irq_set_affinity = bcm7038_l1_set_affinity,
401#ifdef CONFIG_SMP
402 .irq_cpu_offline = bcm7038_l1_cpu_offline,
403#endif
404#ifdef CONFIG_PM_SLEEP
405 .irq_set_wake = bcm7038_l1_set_wake,
406#endif
407};
408
409static int bcm7038_l1_map(struct irq_domain *d, unsigned int virq,
410 irq_hw_number_t hw_irq)
411{
412 struct bcm7038_l1_chip *intc = d->host_data;
413 u32 mask = BIT(hw_irq % IRQS_PER_WORD);
414 u32 word = hw_irq / IRQS_PER_WORD;
415
416 if (intc->irq_fwd_mask[word] & mask)
417 return -EPERM;
418
419 irq_set_chip_and_handler(virq, &bcm7038_l1_irq_chip, handle_level_irq);
420 irq_set_chip_data(virq, d->host_data);
421 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq)));
422 return 0;
423}
424
425static const struct irq_domain_ops bcm7038_l1_domain_ops = {
426 .xlate = irq_domain_xlate_onecell,
427 .map = bcm7038_l1_map,
428};
429
430static int __init bcm7038_l1_of_init(struct device_node *dn,
431 struct device_node *parent)
432{
433 struct bcm7038_l1_chip *intc;
434 int idx, ret;
435
436 intc = kzalloc(sizeof(*intc), GFP_KERNEL);
437 if (!intc)
438 return -ENOMEM;
439
440 raw_spin_lock_init(&intc->lock);
441 for_each_possible_cpu(idx) {
442 ret = bcm7038_l1_init_one(dn, idx, intc);
443 if (ret < 0) {
444 if (idx)
445 break;
446 pr_err("failed to remap intc L1 registers\n");
447 goto out_free;
448 }
449 }
450
451 intc->domain = irq_domain_add_linear(dn, IRQS_PER_WORD * intc->n_words,
452 &bcm7038_l1_domain_ops,
453 intc);
454 if (!intc->domain) {
455 ret = -ENOMEM;
456 goto out_unmap;
457 }
458
459#ifdef CONFIG_PM_SLEEP
460 /* Add bcm7038_l1_chip into a list */
461 raw_spin_lock(&bcm7038_l1_intcs_lock);
462 list_add_tail(&intc->list, &bcm7038_l1_intcs_list);
463 raw_spin_unlock(&bcm7038_l1_intcs_lock);
464
465 if (list_is_singular(&bcm7038_l1_intcs_list))
466 register_syscore_ops(&bcm7038_l1_syscore_ops);
467#endif
468
469 pr_info("registered BCM7038 L1 intc (%pOF, IRQs: %d)\n",
470 dn, IRQS_PER_WORD * intc->n_words);
471
472 return 0;
473
474out_unmap:
475 for_each_possible_cpu(idx) {
476 struct bcm7038_l1_cpu *cpu = intc->cpus[idx];
477
478 if (cpu) {
479 if (cpu->map_base)
480 iounmap(cpu->map_base);
481 kfree(cpu);
482 }
483 }
484out_free:
485 kfree(intc);
486 return ret;
487}
488
489IRQCHIP_DECLARE(bcm7038_l1, "brcm,bcm7038-l1-intc", bcm7038_l1_of_init);