1
2
3
4
5
6
7
8
9
10
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/bitops.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/io.h>
19#include <linux/ioport.h>
20#include <linux/irq.h>
21#include <linux/irqdomain.h>
22#include <linux/module.h>
23#include <linux/of.h>
24#include <linux/of_irq.h>
25#include <linux/of_address.h>
26#include <linux/of_platform.h>
27#include <linux/platform_device.h>
28#include <linux/slab.h>
29#include <linux/smp.h>
30#include <linux/types.h>
31#include <linux/irqchip.h>
32#include <linux/irqchip/chained_irq.h>
33
34#define IRQS_PER_WORD 32
35#define REG_BYTES_PER_IRQ_WORD (sizeof(u32) * 4)
36#define MAX_WORDS 8
37
38struct bcm7038_l1_cpu;
39
40struct bcm7038_l1_chip {
41 raw_spinlock_t lock;
42 unsigned int n_words;
43 struct irq_domain *domain;
44 struct bcm7038_l1_cpu *cpus[NR_CPUS];
45 u8 affinity[MAX_WORDS * IRQS_PER_WORD];
46};
47
48struct bcm7038_l1_cpu {
49 void __iomem *map_base;
50 u32 mask_cache[0];
51};
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77static inline unsigned int reg_status(struct bcm7038_l1_chip *intc,
78 unsigned int word)
79{
80 return (0 * intc->n_words + word) * sizeof(u32);
81}
82
83static inline unsigned int reg_mask_status(struct bcm7038_l1_chip *intc,
84 unsigned int word)
85{
86 return (1 * intc->n_words + word) * sizeof(u32);
87}
88
89static inline unsigned int reg_mask_set(struct bcm7038_l1_chip *intc,
90 unsigned int word)
91{
92 return (2 * intc->n_words + word) * sizeof(u32);
93}
94
95static inline unsigned int reg_mask_clr(struct bcm7038_l1_chip *intc,
96 unsigned int word)
97{
98 return (3 * intc->n_words + word) * sizeof(u32);
99}
100
101static inline u32 l1_readl(void __iomem *reg)
102{
103 if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
104 return ioread32be(reg);
105 else
106 return readl(reg);
107}
108
109static inline void l1_writel(u32 val, void __iomem *reg)
110{
111 if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
112 iowrite32be(val, reg);
113 else
114 writel(val, reg);
115}
116
117static void bcm7038_l1_irq_handle(struct irq_desc *desc)
118{
119 struct bcm7038_l1_chip *intc = irq_desc_get_handler_data(desc);
120 struct bcm7038_l1_cpu *cpu;
121 struct irq_chip *chip = irq_desc_get_chip(desc);
122 unsigned int idx;
123
124#ifdef CONFIG_SMP
125 cpu = intc->cpus[cpu_logical_map(smp_processor_id())];
126#else
127 cpu = intc->cpus[0];
128#endif
129
130 chained_irq_enter(chip, desc);
131
132 for (idx = 0; idx < intc->n_words; idx++) {
133 int base = idx * IRQS_PER_WORD;
134 unsigned long pending, flags;
135 int hwirq;
136
137 raw_spin_lock_irqsave(&intc->lock, flags);
138 pending = l1_readl(cpu->map_base + reg_status(intc, idx)) &
139 ~cpu->mask_cache[idx];
140 raw_spin_unlock_irqrestore(&intc->lock, flags);
141
142 for_each_set_bit(hwirq, &pending, IRQS_PER_WORD) {
143 generic_handle_irq(irq_find_mapping(intc->domain,
144 base + hwirq));
145 }
146 }
147
148 chained_irq_exit(chip, desc);
149}
150
151static void __bcm7038_l1_unmask(struct irq_data *d, unsigned int cpu_idx)
152{
153 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
154 u32 word = d->hwirq / IRQS_PER_WORD;
155 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
156
157 intc->cpus[cpu_idx]->mask_cache[word] &= ~mask;
158 l1_writel(mask, intc->cpus[cpu_idx]->map_base +
159 reg_mask_clr(intc, word));
160}
161
162static void __bcm7038_l1_mask(struct irq_data *d, unsigned int cpu_idx)
163{
164 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
165 u32 word = d->hwirq / IRQS_PER_WORD;
166 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
167
168 intc->cpus[cpu_idx]->mask_cache[word] |= mask;
169 l1_writel(mask, intc->cpus[cpu_idx]->map_base +
170 reg_mask_set(intc, word));
171}
172
173static void bcm7038_l1_unmask(struct irq_data *d)
174{
175 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
176 unsigned long flags;
177
178 raw_spin_lock_irqsave(&intc->lock, flags);
179 __bcm7038_l1_unmask(d, intc->affinity[d->hwirq]);
180 raw_spin_unlock_irqrestore(&intc->lock, flags);
181}
182
183static void bcm7038_l1_mask(struct irq_data *d)
184{
185 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
186 unsigned long flags;
187
188 raw_spin_lock_irqsave(&intc->lock, flags);
189 __bcm7038_l1_mask(d, intc->affinity[d->hwirq]);
190 raw_spin_unlock_irqrestore(&intc->lock, flags);
191}
192
193static int bcm7038_l1_set_affinity(struct irq_data *d,
194 const struct cpumask *dest,
195 bool force)
196{
197 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
198 unsigned long flags;
199 irq_hw_number_t hw = d->hwirq;
200 u32 word = hw / IRQS_PER_WORD;
201 u32 mask = BIT(hw % IRQS_PER_WORD);
202 unsigned int first_cpu = cpumask_any_and(dest, cpu_online_mask);
203 bool was_disabled;
204
205 raw_spin_lock_irqsave(&intc->lock, flags);
206
207 was_disabled = !!(intc->cpus[intc->affinity[hw]]->mask_cache[word] &
208 mask);
209 __bcm7038_l1_mask(d, intc->affinity[hw]);
210 intc->affinity[hw] = first_cpu;
211 if (!was_disabled)
212 __bcm7038_l1_unmask(d, first_cpu);
213
214 raw_spin_unlock_irqrestore(&intc->lock, flags);
215 return 0;
216}
217
218static void bcm7038_l1_cpu_offline(struct irq_data *d)
219{
220 struct cpumask *mask = irq_data_get_affinity_mask(d);
221 int cpu = smp_processor_id();
222 cpumask_t new_affinity;
223
224
225 if (!cpumask_test_cpu(cpu, mask))
226 return;
227
228 if (cpumask_weight(mask) > 1) {
229
230
231
232
233 cpumask_copy(&new_affinity, mask);
234 cpumask_clear_cpu(cpu, &new_affinity);
235 } else {
236
237 cpumask_clear(&new_affinity);
238 cpumask_set_cpu(cpumask_first(cpu_online_mask), &new_affinity);
239 }
240 irq_set_affinity_locked(d, &new_affinity, false);
241}
242
243static int __init bcm7038_l1_init_one(struct device_node *dn,
244 unsigned int idx,
245 struct bcm7038_l1_chip *intc)
246{
247 struct resource res;
248 resource_size_t sz;
249 struct bcm7038_l1_cpu *cpu;
250 unsigned int i, n_words, parent_irq;
251
252 if (of_address_to_resource(dn, idx, &res))
253 return -EINVAL;
254 sz = resource_size(&res);
255 n_words = sz / REG_BYTES_PER_IRQ_WORD;
256
257 if (n_words > MAX_WORDS)
258 return -EINVAL;
259 else if (!intc->n_words)
260 intc->n_words = n_words;
261 else if (intc->n_words != n_words)
262 return -EINVAL;
263
264 cpu = intc->cpus[idx] = kzalloc(sizeof(*cpu) + n_words * sizeof(u32),
265 GFP_KERNEL);
266 if (!cpu)
267 return -ENOMEM;
268
269 cpu->map_base = ioremap(res.start, sz);
270 if (!cpu->map_base)
271 return -ENOMEM;
272
273 for (i = 0; i < n_words; i++) {
274 l1_writel(0xffffffff, cpu->map_base + reg_mask_set(intc, i));
275 cpu->mask_cache[i] = 0xffffffff;
276 }
277
278 parent_irq = irq_of_parse_and_map(dn, idx);
279 if (!parent_irq) {
280 pr_err("failed to map parent interrupt %d\n", parent_irq);
281 return -EINVAL;
282 }
283 irq_set_chained_handler_and_data(parent_irq, bcm7038_l1_irq_handle,
284 intc);
285
286 return 0;
287}
288
289static struct irq_chip bcm7038_l1_irq_chip = {
290 .name = "bcm7038-l1",
291 .irq_mask = bcm7038_l1_mask,
292 .irq_unmask = bcm7038_l1_unmask,
293 .irq_set_affinity = bcm7038_l1_set_affinity,
294 .irq_cpu_offline = bcm7038_l1_cpu_offline,
295};
296
297static int bcm7038_l1_map(struct irq_domain *d, unsigned int virq,
298 irq_hw_number_t hw_irq)
299{
300 irq_set_chip_and_handler(virq, &bcm7038_l1_irq_chip, handle_level_irq);
301 irq_set_chip_data(virq, d->host_data);
302 return 0;
303}
304
305static const struct irq_domain_ops bcm7038_l1_domain_ops = {
306 .xlate = irq_domain_xlate_onecell,
307 .map = bcm7038_l1_map,
308};
309
310int __init bcm7038_l1_of_init(struct device_node *dn,
311 struct device_node *parent)
312{
313 struct bcm7038_l1_chip *intc;
314 int idx, ret;
315
316 intc = kzalloc(sizeof(*intc), GFP_KERNEL);
317 if (!intc)
318 return -ENOMEM;
319
320 raw_spin_lock_init(&intc->lock);
321 for_each_possible_cpu(idx) {
322 ret = bcm7038_l1_init_one(dn, idx, intc);
323 if (ret < 0) {
324 if (idx)
325 break;
326 pr_err("failed to remap intc L1 registers\n");
327 goto out_free;
328 }
329 }
330
331 intc->domain = irq_domain_add_linear(dn, IRQS_PER_WORD * intc->n_words,
332 &bcm7038_l1_domain_ops,
333 intc);
334 if (!intc->domain) {
335 ret = -ENOMEM;
336 goto out_unmap;
337 }
338
339 pr_info("registered BCM7038 L1 intc (mem: 0x%p, IRQs: %d)\n",
340 intc->cpus[0]->map_base, IRQS_PER_WORD * intc->n_words);
341
342 return 0;
343
344out_unmap:
345 for_each_possible_cpu(idx) {
346 struct bcm7038_l1_cpu *cpu = intc->cpus[idx];
347
348 if (cpu) {
349 if (cpu->map_base)
350 iounmap(cpu->map_base);
351 kfree(cpu);
352 }
353 }
354out_free:
355 kfree(intc);
356 return ret;
357}
358
359IRQCHIP_DECLARE(bcm7038_l1, "brcm,bcm7038-l1-intc", bcm7038_l1_of_init);
360
