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12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/bitops.h>
15#include <linux/kconfig.h>
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/interrupt.h>
19#include <linux/io.h>
20#include <linux/ioport.h>
21#include <linux/irq.h>
22#include <linux/irqdomain.h>
23#include <linux/module.h>
24#include <linux/of.h>
25#include <linux/of_irq.h>
26#include <linux/of_address.h>
27#include <linux/of_platform.h>
28#include <linux/platform_device.h>
29#include <linux/slab.h>
30#include <linux/smp.h>
31#include <linux/types.h>
32#include <linux/irqchip/chained_irq.h>
33
34#include "irqchip.h"
35
36#define IRQS_PER_WORD 32
37#define REG_BYTES_PER_IRQ_WORD (sizeof(u32) * 4)
38#define MAX_WORDS 8
39
40struct bcm7038_l1_cpu;
41
42struct bcm7038_l1_chip {
43 raw_spinlock_t lock;
44 unsigned int n_words;
45 struct irq_domain *domain;
46 struct bcm7038_l1_cpu *cpus[NR_CPUS];
47 u8 affinity[MAX_WORDS * IRQS_PER_WORD];
48};
49
50struct bcm7038_l1_cpu {
51 void __iomem *map_base;
52 u32 mask_cache[0];
53};
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79static inline unsigned int reg_status(struct bcm7038_l1_chip *intc,
80 unsigned int word)
81{
82 return (0 * intc->n_words + word) * sizeof(u32);
83}
84
85static inline unsigned int reg_mask_status(struct bcm7038_l1_chip *intc,
86 unsigned int word)
87{
88 return (1 * intc->n_words + word) * sizeof(u32);
89}
90
91static inline unsigned int reg_mask_set(struct bcm7038_l1_chip *intc,
92 unsigned int word)
93{
94 return (2 * intc->n_words + word) * sizeof(u32);
95}
96
97static inline unsigned int reg_mask_clr(struct bcm7038_l1_chip *intc,
98 unsigned int word)
99{
100 return (3 * intc->n_words + word) * sizeof(u32);
101}
102
103static inline u32 l1_readl(void __iomem *reg)
104{
105 if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
106 return ioread32be(reg);
107 else
108 return readl(reg);
109}
110
111static inline void l1_writel(u32 val, void __iomem *reg)
112{
113 if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
114 iowrite32be(val, reg);
115 else
116 writel(val, reg);
117}
118
119static void bcm7038_l1_irq_handle(unsigned int irq, struct irq_desc *desc)
120{
121 struct bcm7038_l1_chip *intc = irq_desc_get_handler_data(desc);
122 struct bcm7038_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, flags;
137 int hwirq;
138
139 raw_spin_lock_irqsave(&intc->lock, flags);
140 pending = l1_readl(cpu->map_base + reg_status(intc, idx)) &
141 ~cpu->mask_cache[idx];
142 raw_spin_unlock_irqrestore(&intc->lock, flags);
143
144 for_each_set_bit(hwirq, &pending, IRQS_PER_WORD) {
145 generic_handle_irq(irq_find_mapping(intc->domain,
146 base + hwirq));
147 }
148 }
149
150 chained_irq_exit(chip, desc);
151}
152
153static void __bcm7038_l1_unmask(struct irq_data *d, unsigned int cpu_idx)
154{
155 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
156 u32 word = d->hwirq / IRQS_PER_WORD;
157 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
158
159 intc->cpus[cpu_idx]->mask_cache[word] &= ~mask;
160 l1_writel(mask, intc->cpus[cpu_idx]->map_base +
161 reg_mask_clr(intc, word));
162}
163
164static void __bcm7038_l1_mask(struct irq_data *d, unsigned int cpu_idx)
165{
166 struct bcm7038_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
170 intc->cpus[cpu_idx]->mask_cache[word] |= mask;
171 l1_writel(mask, intc->cpus[cpu_idx]->map_base +
172 reg_mask_set(intc, word));
173}
174
175static void bcm7038_l1_unmask(struct irq_data *d)
176{
177 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
178 unsigned long flags;
179
180 raw_spin_lock_irqsave(&intc->lock, flags);
181 __bcm7038_l1_unmask(d, intc->affinity[d->hwirq]);
182 raw_spin_unlock_irqrestore(&intc->lock, flags);
183}
184
185static void bcm7038_l1_mask(struct irq_data *d)
186{
187 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
188 unsigned long flags;
189
190 raw_spin_lock_irqsave(&intc->lock, flags);
191 __bcm7038_l1_mask(d, intc->affinity[d->hwirq]);
192 raw_spin_unlock_irqrestore(&intc->lock, flags);
193}
194
195static int bcm7038_l1_set_affinity(struct irq_data *d,
196 const struct cpumask *dest,
197 bool force)
198{
199 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
200 unsigned long flags;
201 irq_hw_number_t hw = d->hwirq;
202 u32 word = hw / IRQS_PER_WORD;
203 u32 mask = BIT(hw % IRQS_PER_WORD);
204 unsigned int first_cpu = cpumask_any_and(dest, cpu_online_mask);
205 bool was_disabled;
206
207 raw_spin_lock_irqsave(&intc->lock, flags);
208
209 was_disabled = !!(intc->cpus[intc->affinity[hw]]->mask_cache[word] &
210 mask);
211 __bcm7038_l1_mask(d, intc->affinity[hw]);
212 intc->affinity[hw] = first_cpu;
213 if (!was_disabled)
214 __bcm7038_l1_unmask(d, first_cpu);
215
216 raw_spin_unlock_irqrestore(&intc->lock, flags);
217 return 0;
218}
219
220static int __init bcm7038_l1_init_one(struct device_node *dn,
221 unsigned int idx,
222 struct bcm7038_l1_chip *intc)
223{
224 struct resource res;
225 resource_size_t sz;
226 struct bcm7038_l1_cpu *cpu;
227 unsigned int i, n_words, parent_irq;
228
229 if (of_address_to_resource(dn, idx, &res))
230 return -EINVAL;
231 sz = resource_size(&res);
232 n_words = sz / REG_BYTES_PER_IRQ_WORD;
233
234 if (n_words > MAX_WORDS)
235 return -EINVAL;
236 else if (!intc->n_words)
237 intc->n_words = n_words;
238 else if (intc->n_words != n_words)
239 return -EINVAL;
240
241 cpu = intc->cpus[idx] = kzalloc(sizeof(*cpu) + n_words * sizeof(u32),
242 GFP_KERNEL);
243 if (!cpu)
244 return -ENOMEM;
245
246 cpu->map_base = ioremap(res.start, sz);
247 if (!cpu->map_base)
248 return -ENOMEM;
249
250 for (i = 0; i < n_words; i++) {
251 l1_writel(0xffffffff, cpu->map_base + reg_mask_set(intc, i));
252 cpu->mask_cache[i] = 0xffffffff;
253 }
254
255 parent_irq = irq_of_parse_and_map(dn, idx);
256 if (!parent_irq) {
257 pr_err("failed to map parent interrupt %d\n", parent_irq);
258 return -EINVAL;
259 }
260 irq_set_handler_data(parent_irq, intc);
261 irq_set_chained_handler(parent_irq, bcm7038_l1_irq_handle);
262
263 return 0;
264}
265
266static struct irq_chip bcm7038_l1_irq_chip = {
267 .name = "bcm7038-l1",
268 .irq_mask = bcm7038_l1_mask,
269 .irq_unmask = bcm7038_l1_unmask,
270 .irq_set_affinity = bcm7038_l1_set_affinity,
271};
272
273static int bcm7038_l1_map(struct irq_domain *d, unsigned int virq,
274 irq_hw_number_t hw_irq)
275{
276 irq_set_chip_and_handler(virq, &bcm7038_l1_irq_chip, handle_level_irq);
277 irq_set_chip_data(virq, d->host_data);
278 return 0;
279}
280
281static const struct irq_domain_ops bcm7038_l1_domain_ops = {
282 .xlate = irq_domain_xlate_onecell,
283 .map = bcm7038_l1_map,
284};
285
286int __init bcm7038_l1_of_init(struct device_node *dn,
287 struct device_node *parent)
288{
289 struct bcm7038_l1_chip *intc;
290 int idx, ret;
291
292 intc = kzalloc(sizeof(*intc), GFP_KERNEL);
293 if (!intc)
294 return -ENOMEM;
295
296 raw_spin_lock_init(&intc->lock);
297 for_each_possible_cpu(idx) {
298 ret = bcm7038_l1_init_one(dn, idx, intc);
299 if (ret < 0) {
300 if (idx)
301 break;
302 pr_err("failed to remap intc L1 registers\n");
303 goto out_free;
304 }
305 }
306
307 intc->domain = irq_domain_add_linear(dn, IRQS_PER_WORD * intc->n_words,
308 &bcm7038_l1_domain_ops,
309 intc);
310 if (!intc->domain) {
311 ret = -ENOMEM;
312 goto out_unmap;
313 }
314
315 pr_info("registered BCM7038 L1 intc (mem: 0x%p, IRQs: %d)\n",
316 intc->cpus[0]->map_base, IRQS_PER_WORD * intc->n_words);
317
318 return 0;
319
320out_unmap:
321 for_each_possible_cpu(idx) {
322 struct bcm7038_l1_cpu *cpu = intc->cpus[idx];
323
324 if (cpu) {
325 if (cpu->map_base)
326 iounmap(cpu->map_base);
327 kfree(cpu);
328 }
329 }
330out_free:
331 kfree(intc);
332 return ret;
333}
334
335IRQCHIP_DECLARE(bcm7038_l1, "brcm,bcm7038-l1-intc", bcm7038_l1_of_init);
336
