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1/*
2 * Broadcom BCM6345 style Level 1 interrupt controller driver
3 *
4 * Copyright (C) 2014 Broadcom Corporation
5 * Copyright 2015 Simon Arlott
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This is based on the BCM7038 (which supports SMP) but with a single
12 * enable register instead of separate mask/set/clear registers.
13 *
14 * The BCM3380 has a similar mask/status register layout, but each pair
15 * of words is at separate locations (and SMP is not supported).
16 *
17 * ENABLE/STATUS words are packed next to each other for each CPU:
18 *
19 * BCM6368:
20 * 0x1000_0020: CPU0_W0_ENABLE
21 * 0x1000_0024: CPU0_W1_ENABLE
22 * 0x1000_0028: CPU0_W0_STATUS IRQs 31-63
23 * 0x1000_002c: CPU0_W1_STATUS IRQs 0-31
24 * 0x1000_0030: CPU1_W0_ENABLE
25 * 0x1000_0034: CPU1_W1_ENABLE
26 * 0x1000_0038: CPU1_W0_STATUS IRQs 31-63
27 * 0x1000_003c: CPU1_W1_STATUS IRQs 0-31
28 *
29 * BCM63168:
30 * 0x1000_0020: CPU0_W0_ENABLE
31 * 0x1000_0024: CPU0_W1_ENABLE
32 * 0x1000_0028: CPU0_W2_ENABLE
33 * 0x1000_002c: CPU0_W3_ENABLE
34 * 0x1000_0030: CPU0_W0_STATUS IRQs 96-127
35 * 0x1000_0034: CPU0_W1_STATUS IRQs 64-95
36 * 0x1000_0038: CPU0_W2_STATUS IRQs 32-63
37 * 0x1000_003c: CPU0_W3_STATUS IRQs 0-31
38 * 0x1000_0040: CPU1_W0_ENABLE
39 * 0x1000_0044: CPU1_W1_ENABLE
40 * 0x1000_0048: CPU1_W2_ENABLE
41 * 0x1000_004c: CPU1_W3_ENABLE
42 * 0x1000_0050: CPU1_W0_STATUS IRQs 96-127
43 * 0x1000_0054: CPU1_W1_STATUS IRQs 64-95
44 * 0x1000_0058: CPU1_W2_STATUS IRQs 32-63
45 * 0x1000_005c: CPU1_W3_STATUS IRQs 0-31
46 *
47 * IRQs are numbered in CPU native endian order
48 * (which is big-endian in these examples)
49 */
50
51#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
52
53#include <linux/bitops.h>
54#include <linux/cpumask.h>
55#include <linux/kernel.h>
56#include <linux/init.h>
57#include <linux/interrupt.h>
58#include <linux/io.h>
59#include <linux/ioport.h>
60#include <linux/irq.h>
61#include <linux/irqdomain.h>
62#include <linux/module.h>
63#include <linux/of.h>
64#include <linux/of_irq.h>
65#include <linux/of_address.h>
66#include <linux/of_platform.h>
67#include <linux/platform_device.h>
68#include <linux/slab.h>
69#include <linux/smp.h>
70#include <linux/types.h>
71#include <linux/irqchip.h>
72#include <linux/irqchip/chained_irq.h>
73
74#define IRQS_PER_WORD 32
75#define REG_BYTES_PER_IRQ_WORD (sizeof(u32) * 2)
76
77struct bcm6345_l1_cpu;
78
79struct bcm6345_l1_chip {
80 raw_spinlock_t lock;
81 unsigned int n_words;
82 struct irq_domain *domain;
83 struct cpumask cpumask;
84 struct bcm6345_l1_cpu *cpus[NR_CPUS];
85};
86
87struct bcm6345_l1_cpu {
88 void __iomem *map_base;
89 unsigned int parent_irq;
90 u32 enable_cache[];
91};
92
93static inline unsigned int reg_enable(struct bcm6345_l1_chip *intc,
94 unsigned int word)
95{
96#ifdef __BIG_ENDIAN
97 return (1 * intc->n_words - word - 1) * sizeof(u32);
98#else
99 return (0 * intc->n_words + word) * sizeof(u32);
100#endif
101}
102
103static inline unsigned int reg_status(struct bcm6345_l1_chip *intc,
104 unsigned int word)
105{
106#ifdef __BIG_ENDIAN
107 return (2 * intc->n_words - word - 1) * sizeof(u32);
108#else
109 return (1 * intc->n_words + word) * sizeof(u32);
110#endif
111}
112
113static inline unsigned int cpu_for_irq(struct bcm6345_l1_chip *intc,
114 struct irq_data *d)
115{
116 return cpumask_first_and(&intc->cpumask, irq_data_get_affinity_mask(d));
117}
118
119static void bcm6345_l1_irq_handle(struct irq_desc *desc)
120{
121 struct bcm6345_l1_chip *intc = irq_desc_get_handler_data(desc);
122 struct bcm6345_l1_cpu *cpu;
123 struct irq_chip *chip = irq_desc_get_chip(desc);
124 unsigned int idx;
125
126#ifdef CONFIG_SMP
127 cpu = intc->cpus[cpu_logical_map(smp_processor_id())];
128#else
129 cpu = intc->cpus[0];
130#endif
131
132 chained_irq_enter(chip, desc);
133
134 for (idx = 0; idx < intc->n_words; idx++) {
135 int base = idx * IRQS_PER_WORD;
136 unsigned long pending;
137 irq_hw_number_t hwirq;
138 unsigned int irq;
139
140 pending = __raw_readl(cpu->map_base + reg_status(intc, idx));
141 pending &= __raw_readl(cpu->map_base + reg_enable(intc, idx));
142
143 for_each_set_bit(hwirq, &pending, IRQS_PER_WORD) {
144 irq = irq_linear_revmap(intc->domain, base + hwirq);
145 if (irq)
146 do_IRQ(irq);
147 else
148 spurious_interrupt();
149 }
150 }
151
152 chained_irq_exit(chip, desc);
153}
154
155static inline void __bcm6345_l1_unmask(struct irq_data *d)
156{
157 struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
158 u32 word = d->hwirq / IRQS_PER_WORD;
159 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
160 unsigned int cpu_idx = cpu_for_irq(intc, d);
161
162 intc->cpus[cpu_idx]->enable_cache[word] |= mask;
163 __raw_writel(intc->cpus[cpu_idx]->enable_cache[word],
164 intc->cpus[cpu_idx]->map_base + reg_enable(intc, word));
165}
166
167static inline void __bcm6345_l1_mask(struct irq_data *d)
168{
169 struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
170 u32 word = d->hwirq / IRQS_PER_WORD;
171 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
172 unsigned int cpu_idx = cpu_for_irq(intc, d);
173
174 intc->cpus[cpu_idx]->enable_cache[word] &= ~mask;
175 __raw_writel(intc->cpus[cpu_idx]->enable_cache[word],
176 intc->cpus[cpu_idx]->map_base + reg_enable(intc, word));
177}
178
179static void bcm6345_l1_unmask(struct irq_data *d)
180{
181 struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
182 unsigned long flags;
183
184 raw_spin_lock_irqsave(&intc->lock, flags);
185 __bcm6345_l1_unmask(d);
186 raw_spin_unlock_irqrestore(&intc->lock, flags);
187}
188
189static void bcm6345_l1_mask(struct irq_data *d)
190{
191 struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
192 unsigned long flags;
193
194 raw_spin_lock_irqsave(&intc->lock, flags);
195 __bcm6345_l1_mask(d);
196 raw_spin_unlock_irqrestore(&intc->lock, flags);
197}
198
199static int bcm6345_l1_set_affinity(struct irq_data *d,
200 const struct cpumask *dest,
201 bool force)
202{
203 struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
204 u32 word = d->hwirq / IRQS_PER_WORD;
205 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
206 unsigned int old_cpu = cpu_for_irq(intc, d);
207 unsigned int new_cpu;
208 struct cpumask valid;
209 unsigned long flags;
210 bool enabled;
211
212 if (!cpumask_and(&valid, &intc->cpumask, dest))
213 return -EINVAL;
214
215 new_cpu = cpumask_any_and(&valid, cpu_online_mask);
216 if (new_cpu >= nr_cpu_ids)
217 return -EINVAL;
218
219 dest = cpumask_of(new_cpu);
220
221 raw_spin_lock_irqsave(&intc->lock, flags);
222 if (old_cpu != new_cpu) {
223 enabled = intc->cpus[old_cpu]->enable_cache[word] & mask;
224 if (enabled)
225 __bcm6345_l1_mask(d);
226 cpumask_copy(irq_data_get_affinity_mask(d), dest);
227 if (enabled)
228 __bcm6345_l1_unmask(d);
229 } else {
230 cpumask_copy(irq_data_get_affinity_mask(d), dest);
231 }
232 raw_spin_unlock_irqrestore(&intc->lock, flags);
233
234 irq_data_update_effective_affinity(d, cpumask_of(new_cpu));
235
236 return IRQ_SET_MASK_OK_NOCOPY;
237}
238
239static int __init bcm6345_l1_init_one(struct device_node *dn,
240 unsigned int idx,
241 struct bcm6345_l1_chip *intc)
242{
243 struct resource res;
244 resource_size_t sz;
245 struct bcm6345_l1_cpu *cpu;
246 unsigned int i, n_words;
247
248 if (of_address_to_resource(dn, idx, &res))
249 return -EINVAL;
250 sz = resource_size(&res);
251 n_words = sz / REG_BYTES_PER_IRQ_WORD;
252
253 if (!intc->n_words)
254 intc->n_words = n_words;
255 else if (intc->n_words != n_words)
256 return -EINVAL;
257
258 cpu = intc->cpus[idx] = kzalloc(sizeof(*cpu) + n_words * sizeof(u32),
259 GFP_KERNEL);
260 if (!cpu)
261 return -ENOMEM;
262
263 cpu->map_base = ioremap(res.start, sz);
264 if (!cpu->map_base)
265 return -ENOMEM;
266
267 for (i = 0; i < n_words; i++) {
268 cpu->enable_cache[i] = 0;
269 __raw_writel(0, cpu->map_base + reg_enable(intc, i));
270 }
271
272 cpu->parent_irq = irq_of_parse_and_map(dn, idx);
273 if (!cpu->parent_irq) {
274 pr_err("failed to map parent interrupt %d\n", cpu->parent_irq);
275 return -EINVAL;
276 }
277 irq_set_chained_handler_and_data(cpu->parent_irq,
278 bcm6345_l1_irq_handle, intc);
279
280 return 0;
281}
282
283static struct irq_chip bcm6345_l1_irq_chip = {
284 .name = "bcm6345-l1",
285 .irq_mask = bcm6345_l1_mask,
286 .irq_unmask = bcm6345_l1_unmask,
287 .irq_set_affinity = bcm6345_l1_set_affinity,
288};
289
290static int bcm6345_l1_map(struct irq_domain *d, unsigned int virq,
291 irq_hw_number_t hw_irq)
292{
293 irq_set_chip_and_handler(virq,
294 &bcm6345_l1_irq_chip, handle_percpu_irq);
295 irq_set_chip_data(virq, d->host_data);
296 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq)));
297 return 0;
298}
299
300static const struct irq_domain_ops bcm6345_l1_domain_ops = {
301 .xlate = irq_domain_xlate_onecell,
302 .map = bcm6345_l1_map,
303};
304
305static int __init bcm6345_l1_of_init(struct device_node *dn,
306 struct device_node *parent)
307{
308 struct bcm6345_l1_chip *intc;
309 unsigned int idx;
310 int ret;
311
312 intc = kzalloc(sizeof(*intc), GFP_KERNEL);
313 if (!intc)
314 return -ENOMEM;
315
316 for_each_possible_cpu(idx) {
317 ret = bcm6345_l1_init_one(dn, idx, intc);
318 if (ret)
319 pr_err("failed to init intc L1 for cpu %d: %d\n",
320 idx, ret);
321 else
322 cpumask_set_cpu(idx, &intc->cpumask);
323 }
324
325 if (!cpumask_weight(&intc->cpumask)) {
326 ret = -ENODEV;
327 goto out_free;
328 }
329
330 raw_spin_lock_init(&intc->lock);
331
332 intc->domain = irq_domain_add_linear(dn, IRQS_PER_WORD * intc->n_words,
333 &bcm6345_l1_domain_ops,
334 intc);
335 if (!intc->domain) {
336 ret = -ENOMEM;
337 goto out_unmap;
338 }
339
340 pr_info("registered BCM6345 L1 intc (IRQs: %d)\n",
341 IRQS_PER_WORD * intc->n_words);
342 for_each_cpu(idx, &intc->cpumask) {
343 struct bcm6345_l1_cpu *cpu = intc->cpus[idx];
344
345 pr_info(" CPU%u at MMIO 0x%p (irq = %d)\n", idx,
346 cpu->map_base, cpu->parent_irq);
347 }
348
349 return 0;
350
351out_unmap:
352 for_each_possible_cpu(idx) {
353 struct bcm6345_l1_cpu *cpu = intc->cpus[idx];
354
355 if (cpu) {
356 if (cpu->map_base)
357 iounmap(cpu->map_base);
358 kfree(cpu);
359 }
360 }
361out_free:
362 kfree(intc);
363 return ret;
364}
365
366IRQCHIP_DECLARE(bcm6345_l1, "brcm,bcm6345-l1-intc", bcm6345_l1_of_init);
367

Warning: That file was not part of the compilation database. It may have many parsing errors.