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48#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
49
50#include <linux/bitops.h>
51#include <linux/cpumask.h>
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
74struct bcm6345_l1_cpu;
75
76struct 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
84struct bcm6345_l1_cpu {
85 void __iomem *map_base;
86 unsigned int parent_irq;
87 u32 enable_cache[];
88};
89
90static 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
100static 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
110static 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
116static 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
136 pending = __raw_readl(cpu->map_base + reg_status(intc, idx));
137 pending &= __raw_readl(cpu->map_base + reg_enable(intc, idx));
138
139 for_each_set_bit(hwirq, &pending, IRQS_PER_WORD) {
140 if (generic_handle_domain_irq(intc->domain, base + hwirq))
141 spurious_interrupt();
142 }
143 }
144
145 chained_irq_exit(chip, desc);
146}
147
148static inline void __bcm6345_l1_unmask(struct irq_data *d)
149{
150 struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
151 u32 word = d->hwirq / IRQS_PER_WORD;
152 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
153 unsigned int cpu_idx = cpu_for_irq(intc, d);
154
155 intc->cpus[cpu_idx]->enable_cache[word] |= mask;
156 __raw_writel(intc->cpus[cpu_idx]->enable_cache[word],
157 intc->cpus[cpu_idx]->map_base + reg_enable(intc, word));
158}
159
160static inline void __bcm6345_l1_mask(struct irq_data *d)
161{
162 struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
163 u32 word = d->hwirq / IRQS_PER_WORD;
164 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
165 unsigned int cpu_idx = cpu_for_irq(intc, d);
166
167 intc->cpus[cpu_idx]->enable_cache[word] &= ~mask;
168 __raw_writel(intc->cpus[cpu_idx]->enable_cache[word],
169 intc->cpus[cpu_idx]->map_base + reg_enable(intc, word));
170}
171
172static void bcm6345_l1_unmask(struct irq_data *d)
173{
174 struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
175 unsigned long flags;
176
177 raw_spin_lock_irqsave(&intc->lock, flags);
178 __bcm6345_l1_unmask(d);
179 raw_spin_unlock_irqrestore(&intc->lock, flags);
180}
181
182static void bcm6345_l1_mask(struct irq_data *d)
183{
184 struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
185 unsigned long flags;
186
187 raw_spin_lock_irqsave(&intc->lock, flags);
188 __bcm6345_l1_mask(d);
189 raw_spin_unlock_irqrestore(&intc->lock, flags);
190}
191
192static int bcm6345_l1_set_affinity(struct irq_data *d,
193 const struct cpumask *dest,
194 bool force)
195{
196 struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
197 u32 word = d->hwirq / IRQS_PER_WORD;
198 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
199 unsigned int old_cpu = cpu_for_irq(intc, d);
200 unsigned int new_cpu;
201 struct cpumask valid;
202 unsigned long flags;
203 bool enabled;
204
205 if (!cpumask_and(&valid, &intc->cpumask, dest))
206 return -EINVAL;
207
208 new_cpu = cpumask_any_and(&valid, cpu_online_mask);
209 if (new_cpu >= nr_cpu_ids)
210 return -EINVAL;
211
212 dest = cpumask_of(new_cpu);
213
214 raw_spin_lock_irqsave(&intc->lock, flags);
215 if (old_cpu != new_cpu) {
216 enabled = intc->cpus[old_cpu]->enable_cache[word] & mask;
217 if (enabled)
218 __bcm6345_l1_mask(d);
219 cpumask_copy(irq_data_get_affinity_mask(d), dest);
220 if (enabled)
221 __bcm6345_l1_unmask(d);
222 } else {
223 cpumask_copy(irq_data_get_affinity_mask(d), dest);
224 }
225 raw_spin_unlock_irqrestore(&intc->lock, flags);
226
227 irq_data_update_effective_affinity(d, cpumask_of(new_cpu));
228
229 return IRQ_SET_MASK_OK_NOCOPY;
230}
231
232static int __init bcm6345_l1_init_one(struct device_node *dn,
233 unsigned int idx,
234 struct bcm6345_l1_chip *intc)
235{
236 struct resource res;
237 resource_size_t sz;
238 struct bcm6345_l1_cpu *cpu;
239 unsigned int i, n_words;
240
241 if (of_address_to_resource(dn, idx, &res))
242 return -EINVAL;
243 sz = resource_size(&res);
244 n_words = sz / REG_BYTES_PER_IRQ_WORD;
245
246 if (!intc->n_words)
247 intc->n_words = n_words;
248 else if (intc->n_words != n_words)
249 return -EINVAL;
250
251 cpu = intc->cpus[idx] = kzalloc(sizeof(*cpu) + n_words * sizeof(u32),
252 GFP_KERNEL);
253 if (!cpu)
254 return -ENOMEM;
255
256 cpu->map_base = ioremap(res.start, sz);
257 if (!cpu->map_base)
258 return -ENOMEM;
259
260 for (i = 0; i < n_words; i++) {
261 cpu->enable_cache[i] = 0;
262 __raw_writel(0, cpu->map_base + reg_enable(intc, i));
263 }
264
265 cpu->parent_irq = irq_of_parse_and_map(dn, idx);
266 if (!cpu->parent_irq) {
267 pr_err("failed to map parent interrupt %d\n", cpu->parent_irq);
268 return -EINVAL;
269 }
270 irq_set_chained_handler_and_data(cpu->parent_irq,
271 bcm6345_l1_irq_handle, intc);
272
273 return 0;
274}
275
276static struct irq_chip bcm6345_l1_irq_chip = {
277 .name = "bcm6345-l1",
278 .irq_mask = bcm6345_l1_mask,
279 .irq_unmask = bcm6345_l1_unmask,
280 .irq_set_affinity = bcm6345_l1_set_affinity,
281};
282
283static int bcm6345_l1_map(struct irq_domain *d, unsigned int virq,
284 irq_hw_number_t hw_irq)
285{
286 irq_set_chip_and_handler(virq,
287 &bcm6345_l1_irq_chip, handle_percpu_irq);
288 irq_set_chip_data(virq, d->host_data);
289 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq)));
290 return 0;
291}
292
293static const struct irq_domain_ops bcm6345_l1_domain_ops = {
294 .xlate = irq_domain_xlate_onecell,
295 .map = bcm6345_l1_map,
296};
297
298static int __init bcm6345_l1_of_init(struct device_node *dn,
299 struct device_node *parent)
300{
301 struct bcm6345_l1_chip *intc;
302 unsigned int idx;
303 int ret;
304
305 intc = kzalloc(sizeof(*intc), GFP_KERNEL);
306 if (!intc)
307 return -ENOMEM;
308
309 for_each_possible_cpu(idx) {
310 ret = bcm6345_l1_init_one(dn, idx, intc);
311 if (ret)
312 pr_err("failed to init intc L1 for cpu %d: %d\n",
313 idx, ret);
314 else
315 cpumask_set_cpu(idx, &intc->cpumask);
316 }
317
318 if (!cpumask_weight(&intc->cpumask)) {
319 ret = -ENODEV;
320 goto out_free;
321 }
322
323 raw_spin_lock_init(&intc->lock);
324
325 intc->domain = irq_domain_add_linear(dn, IRQS_PER_WORD * intc->n_words,
326 &bcm6345_l1_domain_ops,
327 intc);
328 if (!intc->domain) {
329 ret = -ENOMEM;
330 goto out_unmap;
331 }
332
333 pr_info("registered BCM6345 L1 intc (IRQs: %d)\n",
334 IRQS_PER_WORD * intc->n_words);
335 for_each_cpu(idx, &intc->cpumask) {
336 struct bcm6345_l1_cpu *cpu = intc->cpus[idx];
337
338 pr_info(" CPU%u at MMIO 0x%p (irq = %d)\n", idx,
339 cpu->map_base, cpu->parent_irq);
340 }
341
342 return 0;
343
344out_unmap:
345 for_each_possible_cpu(idx) {
346 struct bcm6345_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(bcm6345_l1, "brcm,bcm6345-l1-intc", bcm6345_l1_of_init);
360
