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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c7c42ec2 SA |
2 | /* |
3 | * Broadcom BCM6345 style Level 1 interrupt controller driver | |
4 | * | |
5 | * Copyright (C) 2014 Broadcom Corporation | |
6 | * Copyright 2015 Simon Arlott | |
7 | * | |
c7c42ec2 SA |
8 | * This is based on the BCM7038 (which supports SMP) but with a single |
9 | * enable register instead of separate mask/set/clear registers. | |
10 | * | |
11 | * The BCM3380 has a similar mask/status register layout, but each pair | |
12 | * of words is at separate locations (and SMP is not supported). | |
13 | * | |
14 | * ENABLE/STATUS words are packed next to each other for each CPU: | |
15 | * | |
16 | * BCM6368: | |
17 | * 0x1000_0020: CPU0_W0_ENABLE | |
18 | * 0x1000_0024: CPU0_W1_ENABLE | |
19 | * 0x1000_0028: CPU0_W0_STATUS IRQs 31-63 | |
20 | * 0x1000_002c: CPU0_W1_STATUS IRQs 0-31 | |
21 | * 0x1000_0030: CPU1_W0_ENABLE | |
22 | * 0x1000_0034: CPU1_W1_ENABLE | |
23 | * 0x1000_0038: CPU1_W0_STATUS IRQs 31-63 | |
24 | * 0x1000_003c: CPU1_W1_STATUS IRQs 0-31 | |
25 | * | |
26 | * BCM63168: | |
27 | * 0x1000_0020: CPU0_W0_ENABLE | |
28 | * 0x1000_0024: CPU0_W1_ENABLE | |
29 | * 0x1000_0028: CPU0_W2_ENABLE | |
30 | * 0x1000_002c: CPU0_W3_ENABLE | |
31 | * 0x1000_0030: CPU0_W0_STATUS IRQs 96-127 | |
32 | * 0x1000_0034: CPU0_W1_STATUS IRQs 64-95 | |
33 | * 0x1000_0038: CPU0_W2_STATUS IRQs 32-63 | |
34 | * 0x1000_003c: CPU0_W3_STATUS IRQs 0-31 | |
35 | * 0x1000_0040: CPU1_W0_ENABLE | |
36 | * 0x1000_0044: CPU1_W1_ENABLE | |
37 | * 0x1000_0048: CPU1_W2_ENABLE | |
38 | * 0x1000_004c: CPU1_W3_ENABLE | |
39 | * 0x1000_0050: CPU1_W0_STATUS IRQs 96-127 | |
40 | * 0x1000_0054: CPU1_W1_STATUS IRQs 64-95 | |
41 | * 0x1000_0058: CPU1_W2_STATUS IRQs 32-63 | |
42 | * 0x1000_005c: CPU1_W3_STATUS IRQs 0-31 | |
43 | * | |
44 | * IRQs are numbered in CPU native endian order | |
45 | * (which is big-endian in these examples) | |
46 | */ | |
47 | ||
48 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
49 | ||
50 | #include <linux/bitops.h> | |
51 | #include <linux/cpumask.h> | |
c7c42ec2 SA |
52 | #include <linux/kernel.h> |
53 | #include <linux/init.h> | |
54 | #include <linux/interrupt.h> | |
55 | #include <linux/io.h> | |
56 | #include <linux/ioport.h> | |
57 | #include <linux/irq.h> | |
58 | #include <linux/irqdomain.h> | |
59 | #include <linux/module.h> | |
60 | #include <linux/of.h> | |
61 | #include <linux/of_irq.h> | |
62 | #include <linux/of_address.h> | |
63 | #include <linux/of_platform.h> | |
64 | #include <linux/platform_device.h> | |
65 | #include <linux/slab.h> | |
66 | #include <linux/smp.h> | |
67 | #include <linux/types.h> | |
68 | #include <linux/irqchip.h> | |
69 | #include <linux/irqchip/chained_irq.h> | |
70 | ||
71 | #define IRQS_PER_WORD 32 | |
72 | #define REG_BYTES_PER_IRQ_WORD (sizeof(u32) * 2) | |
73 | ||
74 | struct bcm6345_l1_cpu; | |
75 | ||
76 | struct bcm6345_l1_chip { | |
77 | raw_spinlock_t lock; | |
78 | unsigned int n_words; | |
79 | struct irq_domain *domain; | |
80 | struct cpumask cpumask; | |
81 | struct bcm6345_l1_cpu *cpus[NR_CPUS]; | |
82 | }; | |
83 | ||
84 | struct bcm6345_l1_cpu { | |
85 | void __iomem *map_base; | |
86 | unsigned int parent_irq; | |
87 | u32 enable_cache[]; | |
88 | }; | |
89 | ||
90 | static inline unsigned int reg_enable(struct bcm6345_l1_chip *intc, | |
91 | unsigned int word) | |
92 | { | |
93 | #ifdef __BIG_ENDIAN | |
94 | return (1 * intc->n_words - word - 1) * sizeof(u32); | |
95 | #else | |
96 | return (0 * intc->n_words + word) * sizeof(u32); | |
97 | #endif | |
98 | } | |
99 | ||
100 | static inline unsigned int reg_status(struct bcm6345_l1_chip *intc, | |
101 | unsigned int word) | |
102 | { | |
103 | #ifdef __BIG_ENDIAN | |
104 | return (2 * intc->n_words - word - 1) * sizeof(u32); | |
105 | #else | |
106 | return (1 * intc->n_words + word) * sizeof(u32); | |
107 | #endif | |
108 | } | |
109 | ||
110 | static inline unsigned int cpu_for_irq(struct bcm6345_l1_chip *intc, | |
111 | struct irq_data *d) | |
112 | { | |
113 | return cpumask_first_and(&intc->cpumask, irq_data_get_affinity_mask(d)); | |
114 | } | |
115 | ||
116 | static void bcm6345_l1_irq_handle(struct irq_desc *desc) | |
117 | { | |
118 | struct bcm6345_l1_chip *intc = irq_desc_get_handler_data(desc); | |
119 | struct bcm6345_l1_cpu *cpu; | |
120 | struct irq_chip *chip = irq_desc_get_chip(desc); | |
121 | unsigned int idx; | |
122 | ||
123 | #ifdef CONFIG_SMP | |
124 | cpu = intc->cpus[cpu_logical_map(smp_processor_id())]; | |
125 | #else | |
126 | cpu = intc->cpus[0]; | |
127 | #endif | |
128 | ||
129 | chained_irq_enter(chip, desc); | |
130 | ||
131 | for (idx = 0; idx < intc->n_words; idx++) { | |
132 | int base = idx * IRQS_PER_WORD; | |
133 | unsigned long pending; | |
134 | irq_hw_number_t hwirq; | |
135 | unsigned int irq; | |
136 | ||
137 | pending = __raw_readl(cpu->map_base + reg_status(intc, idx)); | |
138 | pending &= __raw_readl(cpu->map_base + reg_enable(intc, idx)); | |
139 | ||
140 | for_each_set_bit(hwirq, &pending, IRQS_PER_WORD) { | |
141 | irq = irq_linear_revmap(intc->domain, base + hwirq); | |
142 | if (irq) | |
143 | do_IRQ(irq); | |
144 | else | |
145 | spurious_interrupt(); | |
146 | } | |
147 | } | |
148 | ||
149 | chained_irq_exit(chip, desc); | |
150 | } | |
151 | ||
152 | static inline void __bcm6345_l1_unmask(struct irq_data *d) | |
153 | { | |
154 | struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d); | |
155 | u32 word = d->hwirq / IRQS_PER_WORD; | |
156 | u32 mask = BIT(d->hwirq % IRQS_PER_WORD); | |
157 | unsigned int cpu_idx = cpu_for_irq(intc, d); | |
158 | ||
159 | intc->cpus[cpu_idx]->enable_cache[word] |= mask; | |
160 | __raw_writel(intc->cpus[cpu_idx]->enable_cache[word], | |
161 | intc->cpus[cpu_idx]->map_base + reg_enable(intc, word)); | |
162 | } | |
163 | ||
164 | static inline void __bcm6345_l1_mask(struct irq_data *d) | |
165 | { | |
166 | struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d); | |
167 | u32 word = d->hwirq / IRQS_PER_WORD; | |
168 | u32 mask = BIT(d->hwirq % IRQS_PER_WORD); | |
169 | unsigned int cpu_idx = cpu_for_irq(intc, d); | |
170 | ||
171 | intc->cpus[cpu_idx]->enable_cache[word] &= ~mask; | |
172 | __raw_writel(intc->cpus[cpu_idx]->enable_cache[word], | |
173 | intc->cpus[cpu_idx]->map_base + reg_enable(intc, word)); | |
174 | } | |
175 | ||
176 | static void bcm6345_l1_unmask(struct irq_data *d) | |
177 | { | |
178 | struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d); | |
179 | unsigned long flags; | |
180 | ||
181 | raw_spin_lock_irqsave(&intc->lock, flags); | |
182 | __bcm6345_l1_unmask(d); | |
183 | raw_spin_unlock_irqrestore(&intc->lock, flags); | |
184 | } | |
185 | ||
186 | static void bcm6345_l1_mask(struct irq_data *d) | |
187 | { | |
188 | struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d); | |
189 | unsigned long flags; | |
190 | ||
191 | raw_spin_lock_irqsave(&intc->lock, flags); | |
192 | __bcm6345_l1_mask(d); | |
193 | raw_spin_unlock_irqrestore(&intc->lock, flags); | |
194 | } | |
195 | ||
196 | static int bcm6345_l1_set_affinity(struct irq_data *d, | |
197 | const struct cpumask *dest, | |
198 | bool force) | |
199 | { | |
200 | struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d); | |
201 | u32 word = d->hwirq / IRQS_PER_WORD; | |
202 | u32 mask = BIT(d->hwirq % IRQS_PER_WORD); | |
203 | unsigned int old_cpu = cpu_for_irq(intc, d); | |
204 | unsigned int new_cpu; | |
205 | struct cpumask valid; | |
206 | unsigned long flags; | |
207 | bool enabled; | |
208 | ||
209 | if (!cpumask_and(&valid, &intc->cpumask, dest)) | |
210 | return -EINVAL; | |
211 | ||
212 | new_cpu = cpumask_any_and(&valid, cpu_online_mask); | |
213 | if (new_cpu >= nr_cpu_ids) | |
214 | return -EINVAL; | |
215 | ||
216 | dest = cpumask_of(new_cpu); | |
217 | ||
218 | raw_spin_lock_irqsave(&intc->lock, flags); | |
219 | if (old_cpu != new_cpu) { | |
220 | enabled = intc->cpus[old_cpu]->enable_cache[word] & mask; | |
221 | if (enabled) | |
222 | __bcm6345_l1_mask(d); | |
223 | cpumask_copy(irq_data_get_affinity_mask(d), dest); | |
224 | if (enabled) | |
225 | __bcm6345_l1_unmask(d); | |
226 | } else { | |
227 | cpumask_copy(irq_data_get_affinity_mask(d), dest); | |
228 | } | |
229 | raw_spin_unlock_irqrestore(&intc->lock, flags); | |
230 | ||
d0ed5e8e MZ |
231 | irq_data_update_effective_affinity(d, cpumask_of(new_cpu)); |
232 | ||
c7c42ec2 SA |
233 | return IRQ_SET_MASK_OK_NOCOPY; |
234 | } | |
235 | ||
236 | static int __init bcm6345_l1_init_one(struct device_node *dn, | |
237 | unsigned int idx, | |
238 | struct bcm6345_l1_chip *intc) | |
239 | { | |
240 | struct resource res; | |
241 | resource_size_t sz; | |
242 | struct bcm6345_l1_cpu *cpu; | |
243 | unsigned int i, n_words; | |
244 | ||
245 | if (of_address_to_resource(dn, idx, &res)) | |
246 | return -EINVAL; | |
247 | sz = resource_size(&res); | |
248 | n_words = sz / REG_BYTES_PER_IRQ_WORD; | |
249 | ||
250 | if (!intc->n_words) | |
251 | intc->n_words = n_words; | |
252 | else if (intc->n_words != n_words) | |
253 | return -EINVAL; | |
254 | ||
255 | cpu = intc->cpus[idx] = kzalloc(sizeof(*cpu) + n_words * sizeof(u32), | |
256 | GFP_KERNEL); | |
257 | if (!cpu) | |
258 | return -ENOMEM; | |
259 | ||
260 | cpu->map_base = ioremap(res.start, sz); | |
261 | if (!cpu->map_base) | |
262 | return -ENOMEM; | |
263 | ||
264 | for (i = 0; i < n_words; i++) { | |
265 | cpu->enable_cache[i] = 0; | |
266 | __raw_writel(0, cpu->map_base + reg_enable(intc, i)); | |
267 | } | |
268 | ||
269 | cpu->parent_irq = irq_of_parse_and_map(dn, idx); | |
270 | if (!cpu->parent_irq) { | |
271 | pr_err("failed to map parent interrupt %d\n", cpu->parent_irq); | |
272 | return -EINVAL; | |
273 | } | |
274 | irq_set_chained_handler_and_data(cpu->parent_irq, | |
275 | bcm6345_l1_irq_handle, intc); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static struct irq_chip bcm6345_l1_irq_chip = { | |
281 | .name = "bcm6345-l1", | |
282 | .irq_mask = bcm6345_l1_mask, | |
283 | .irq_unmask = bcm6345_l1_unmask, | |
284 | .irq_set_affinity = bcm6345_l1_set_affinity, | |
285 | }; | |
286 | ||
287 | static int bcm6345_l1_map(struct irq_domain *d, unsigned int virq, | |
288 | irq_hw_number_t hw_irq) | |
289 | { | |
290 | irq_set_chip_and_handler(virq, | |
291 | &bcm6345_l1_irq_chip, handle_percpu_irq); | |
292 | irq_set_chip_data(virq, d->host_data); | |
d0ed5e8e | 293 | irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq))); |
c7c42ec2 SA |
294 | return 0; |
295 | } | |
296 | ||
297 | static const struct irq_domain_ops bcm6345_l1_domain_ops = { | |
298 | .xlate = irq_domain_xlate_onecell, | |
299 | .map = bcm6345_l1_map, | |
300 | }; | |
301 | ||
302 | static int __init bcm6345_l1_of_init(struct device_node *dn, | |
303 | struct device_node *parent) | |
304 | { | |
305 | struct bcm6345_l1_chip *intc; | |
306 | unsigned int idx; | |
307 | int ret; | |
308 | ||
309 | intc = kzalloc(sizeof(*intc), GFP_KERNEL); | |
310 | if (!intc) | |
311 | return -ENOMEM; | |
312 | ||
313 | for_each_possible_cpu(idx) { | |
314 | ret = bcm6345_l1_init_one(dn, idx, intc); | |
315 | if (ret) | |
316 | pr_err("failed to init intc L1 for cpu %d: %d\n", | |
317 | idx, ret); | |
318 | else | |
319 | cpumask_set_cpu(idx, &intc->cpumask); | |
320 | } | |
321 | ||
322 | if (!cpumask_weight(&intc->cpumask)) { | |
323 | ret = -ENODEV; | |
324 | goto out_free; | |
325 | } | |
326 | ||
327 | raw_spin_lock_init(&intc->lock); | |
328 | ||
329 | intc->domain = irq_domain_add_linear(dn, IRQS_PER_WORD * intc->n_words, | |
330 | &bcm6345_l1_domain_ops, | |
331 | intc); | |
332 | if (!intc->domain) { | |
333 | ret = -ENOMEM; | |
334 | goto out_unmap; | |
335 | } | |
336 | ||
337 | pr_info("registered BCM6345 L1 intc (IRQs: %d)\n", | |
338 | IRQS_PER_WORD * intc->n_words); | |
339 | for_each_cpu(idx, &intc->cpumask) { | |
340 | struct bcm6345_l1_cpu *cpu = intc->cpus[idx]; | |
341 | ||
342 | pr_info(" CPU%u at MMIO 0x%p (irq = %d)\n", idx, | |
343 | cpu->map_base, cpu->parent_irq); | |
344 | } | |
345 | ||
346 | return 0; | |
347 | ||
348 | out_unmap: | |
349 | for_each_possible_cpu(idx) { | |
350 | struct bcm6345_l1_cpu *cpu = intc->cpus[idx]; | |
351 | ||
352 | if (cpu) { | |
353 | if (cpu->map_base) | |
354 | iounmap(cpu->map_base); | |
355 | kfree(cpu); | |
356 | } | |
357 | } | |
358 | out_free: | |
359 | kfree(intc); | |
360 | return ret; | |
361 | } | |
362 | ||
363 | IRQCHIP_DECLARE(bcm6345_l1, "brcm,bcm6345-l1-intc", bcm6345_l1_of_init); |