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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.h>
33#include <linux/irqchip/chained_irq.h>
34
35#define IRQS_PER_WORD 32
36#define REG_BYTES_PER_IRQ_WORD (sizeof(u32) * 4)
37#define MAX_WORDS 8
38
39struct bcm7038_l1_cpu;
40
41struct bcm7038_l1_chip {
42 raw_spinlock_t lock;
43 unsigned int n_words;
44 struct irq_domain *domain;
45 struct bcm7038_l1_cpu *cpus[NR_CPUS];
46 u8 affinity[MAX_WORDS * IRQS_PER_WORD];
47};
48
49struct bcm7038_l1_cpu {
50 void __iomem *map_base;
51 u32 mask_cache[0];
52};
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78static inline unsigned int reg_status(struct bcm7038_l1_chip *intc,
79 unsigned int word)
80{
81 return (0 * intc->n_words + word) * sizeof(u32);
82}
83
84static inline unsigned int reg_mask_status(struct bcm7038_l1_chip *intc,
85 unsigned int word)
86{
87 return (1 * intc->n_words + word) * sizeof(u32);
88}
89
90static inline unsigned int reg_mask_set(struct bcm7038_l1_chip *intc,
91 unsigned int word)
92{
93 return (2 * intc->n_words + word) * sizeof(u32);
94}
95
96static inline unsigned int reg_mask_clr(struct bcm7038_l1_chip *intc,
97 unsigned int word)
98{
99 return (3 * intc->n_words + word) * sizeof(u32);
100}
101
102static inline u32 l1_readl(void __iomem *reg)
103{
104 if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
105 return ioread32be(reg);
106 else
107 return readl(reg);
108}
109
110static inline void l1_writel(u32 val, void __iomem *reg)
111{
112 if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
113 iowrite32be(val, reg);
114 else
115 writel(val, reg);
116}
117
118static void bcm7038_l1_irq_handle(struct irq_desc *desc)
119{
120 struct bcm7038_l1_chip *intc = irq_desc_get_handler_data(desc);
121 struct bcm7038_l1_cpu *cpu;
122 struct irq_chip *chip = irq_desc_get_chip(desc);
123 unsigned int idx;
124
125#ifdef CONFIG_SMP
126 cpu = intc->cpus[cpu_logical_map(smp_processor_id())];
127#else
128 cpu = intc->cpus[0];
129#endif
130
131 chained_irq_enter(chip, desc);
132
133 for (idx = 0; idx < intc->n_words; idx++) {
134 int base = idx * IRQS_PER_WORD;
135 unsigned long pending, flags;
136 int hwirq;
137
138 raw_spin_lock_irqsave(&intc->lock, flags);
139 pending = l1_readl(cpu->map_base + reg_status(intc, idx)) &
140 ~cpu->mask_cache[idx];
141 raw_spin_unlock_irqrestore(&intc->lock, flags);
142
143 for_each_set_bit(hwirq, &pending, IRQS_PER_WORD) {
144 generic_handle_irq(irq_find_mapping(intc->domain,
145 base + hwirq));
146 }
147 }
148
149 chained_irq_exit(chip, desc);
150}
151
152static void __bcm7038_l1_unmask(struct irq_data *d, unsigned int cpu_idx)
153{
154 struct bcm7038_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
158 intc->cpus[cpu_idx]->mask_cache[word] &= ~mask;
159 l1_writel(mask, intc->cpus[cpu_idx]->map_base +
160 reg_mask_clr(intc, word));
161}
162
163static void __bcm7038_l1_mask(struct irq_data *d, unsigned int cpu_idx)
164{
165 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
166 u32 word = d->hwirq / IRQS_PER_WORD;
167 u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
168
169 intc->cpus[cpu_idx]->mask_cache[word] |= mask;
170 l1_writel(mask, intc->cpus[cpu_idx]->map_base +
171 reg_mask_set(intc, word));
172}
173
174static void bcm7038_l1_unmask(struct irq_data *d)
175{
176 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
177 unsigned long flags;
178
179 raw_spin_lock_irqsave(&intc->lock, flags);
180 __bcm7038_l1_unmask(d, intc->affinity[d->hwirq]);
181 raw_spin_unlock_irqrestore(&intc->lock, flags);
182}
183
184static void bcm7038_l1_mask(struct irq_data *d)
185{
186 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
187 unsigned long flags;
188
189 raw_spin_lock_irqsave(&intc->lock, flags);
190 __bcm7038_l1_mask(d, intc->affinity[d->hwirq]);
191 raw_spin_unlock_irqrestore(&intc->lock, flags);
192}
193
194static int bcm7038_l1_set_affinity(struct irq_data *d,
195 const struct cpumask *dest,
196 bool force)
197{
198 struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
199 unsigned long flags;
200 irq_hw_number_t hw = d->hwirq;
201 u32 word = hw / IRQS_PER_WORD;
202 u32 mask = BIT(hw % IRQS_PER_WORD);
203 unsigned int first_cpu = cpumask_any_and(dest, cpu_online_mask);
204 bool was_disabled;
205
206 raw_spin_lock_irqsave(&intc->lock, flags);
207
208 was_disabled = !!(intc->cpus[intc->affinity[hw]]->mask_cache[word] &
209 mask);
210 __bcm7038_l1_mask(d, intc->affinity[hw]);
211 intc->affinity[hw] = first_cpu;
212 if (!was_disabled)
213 __bcm7038_l1_unmask(d, first_cpu);
214
215 raw_spin_unlock_irqrestore(&intc->lock, flags);
216 return 0;
217}
218
219static int __init bcm7038_l1_init_one(struct device_node *dn,
220 unsigned int idx,
221 struct bcm7038_l1_chip *intc)
222{
223 struct resource res;
224 resource_size_t sz;
225 struct bcm7038_l1_cpu *cpu;
226 unsigned int i, n_words, parent_irq;
227
228 if (of_address_to_resource(dn, idx, &res))
229 return -EINVAL;
230 sz = resource_size(&res);
231 n_words = sz / REG_BYTES_PER_IRQ_WORD;
232
233 if (n_words > MAX_WORDS)
234 return -EINVAL;
235 else if (!intc->n_words)
236 intc->n_words = n_words;
237 else if (intc->n_words != n_words)
238 return -EINVAL;
239
240 cpu = intc->cpus[idx] = kzalloc(sizeof(*cpu) + n_words * sizeof(u32),
241 GFP_KERNEL);
242 if (!cpu)
243 return -ENOMEM;
244
245 cpu->map_base = ioremap(res.start, sz);
246 if (!cpu->map_base)
247 return -ENOMEM;
248
249 for (i = 0; i < n_words; i++) {
250 l1_writel(0xffffffff, cpu->map_base + reg_mask_set(intc, i));
251 cpu->mask_cache[i] = 0xffffffff;
252 }
253
254 parent_irq = irq_of_parse_and_map(dn, idx);
255 if (!parent_irq) {
256 pr_err("failed to map parent interrupt %d\n", parent_irq);
257 return -EINVAL;
258 }
259 irq_set_chained_handler_and_data(parent_irq, bcm7038_l1_irq_handle,
260 intc);
261
262 return 0;
263}
264
265static struct irq_chip bcm7038_l1_irq_chip = {
266 .name = "bcm7038-l1",
267 .irq_mask = bcm7038_l1_mask,
268 .irq_unmask = bcm7038_l1_unmask,
269 .irq_set_affinity = bcm7038_l1_set_affinity,
270};
271
272static int bcm7038_l1_map(struct irq_domain *d, unsigned int virq,
273 irq_hw_number_t hw_irq)
274{
275 irq_set_chip_and_handler(virq, &bcm7038_l1_irq_chip, handle_level_irq);
276 irq_set_chip_data(virq, d->host_data);
277 return 0;
278}
279
280static const struct irq_domain_ops bcm7038_l1_domain_ops = {
281 .xlate = irq_domain_xlate_onecell,
282 .map = bcm7038_l1_map,
283};
284
285int __init bcm7038_l1_of_init(struct device_node *dn,
286 struct device_node *parent)
287{
288 struct bcm7038_l1_chip *intc;
289 int idx, ret;
290
291 intc = kzalloc(sizeof(*intc), GFP_KERNEL);
292 if (!intc)
293 return -ENOMEM;
294
295 raw_spin_lock_init(&intc->lock);
296 for_each_possible_cpu(idx) {
297 ret = bcm7038_l1_init_one(dn, idx, intc);
298 if (ret < 0) {
299 if (idx)
300 break;
301 pr_err("failed to remap intc L1 registers\n");
302 goto out_free;
303 }
304 }
305
306 intc->domain = irq_domain_add_linear(dn, IRQS_PER_WORD * intc->n_words,
307 &bcm7038_l1_domain_ops,
308 intc);
309 if (!intc->domain) {
310 ret = -ENOMEM;
311 goto out_unmap;
312 }
313
314 pr_info("registered BCM7038 L1 intc (mem: 0x%p, IRQs: %d)\n",
315 intc->cpus[0]->map_base, IRQS_PER_WORD * intc->n_words);
316
317 return 0;
318
319out_unmap:
320 for_each_possible_cpu(idx) {
321 struct bcm7038_l1_cpu *cpu = intc->cpus[idx];
322
323 if (cpu) {
324 if (cpu->map_base)
325 iounmap(cpu->map_base);
326 kfree(cpu);
327 }
328 }
329out_free:
330 kfree(intc);
331 return ret;
332}
333
334IRQCHIP_DECLARE(bcm7038_l1, "brcm,bcm7038-l1-intc", bcm7038_l1_of_init);
335
