Commit | Line | Data |
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f27ecacc | 1 | /* |
f27ecacc RK |
2 | * Copyright (C) 2002 ARM Limited, All Rights Reserved. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Interrupt architecture for the GIC: | |
9 | * | |
10 | * o There is one Interrupt Distributor, which receives interrupts | |
11 | * from system devices and sends them to the Interrupt Controllers. | |
12 | * | |
13 | * o There is one CPU Interface per CPU, which sends interrupts sent | |
14 | * by the Distributor, and interrupts generated locally, to the | |
b3a1bde4 CM |
15 | * associated CPU. The base address of the CPU interface is usually |
16 | * aliased so that the same address points to different chips depending | |
17 | * on the CPU it is accessed from. | |
f27ecacc RK |
18 | * |
19 | * Note that IRQs 0-31 are special - they are local to each CPU. | |
20 | * As such, the enable set/clear, pending set/clear and active bit | |
21 | * registers are banked per-cpu for these sources. | |
22 | */ | |
23 | #include <linux/init.h> | |
24 | #include <linux/kernel.h> | |
f37a53cc | 25 | #include <linux/err.h> |
7e1efcf5 | 26 | #include <linux/module.h> |
f27ecacc RK |
27 | #include <linux/list.h> |
28 | #include <linux/smp.h> | |
c0114709 | 29 | #include <linux/cpu.h> |
254056f3 | 30 | #include <linux/cpu_pm.h> |
dcb86e8c | 31 | #include <linux/cpumask.h> |
fced80c7 | 32 | #include <linux/io.h> |
b3f7ed03 RH |
33 | #include <linux/of.h> |
34 | #include <linux/of_address.h> | |
35 | #include <linux/of_irq.h> | |
4294f8ba | 36 | #include <linux/irqdomain.h> |
292b293c MZ |
37 | #include <linux/interrupt.h> |
38 | #include <linux/percpu.h> | |
39 | #include <linux/slab.h> | |
de88cbb7 | 40 | #include <linux/irqchip/chained_irq.h> |
520f7bd7 | 41 | #include <linux/irqchip/arm-gic.h> |
f27ecacc | 42 | |
29e697b1 | 43 | #include <asm/cputype.h> |
f27ecacc | 44 | #include <asm/irq.h> |
562e0027 | 45 | #include <asm/exception.h> |
eb50439b | 46 | #include <asm/smp_plat.h> |
f27ecacc | 47 | |
d51d0af4 | 48 | #include "irq-gic-common.h" |
81243e44 | 49 | #include "irqchip.h" |
f27ecacc | 50 | |
db0d4db2 MZ |
51 | union gic_base { |
52 | void __iomem *common_base; | |
6859358e | 53 | void __percpu * __iomem *percpu_base; |
db0d4db2 MZ |
54 | }; |
55 | ||
56 | struct gic_chip_data { | |
db0d4db2 MZ |
57 | union gic_base dist_base; |
58 | union gic_base cpu_base; | |
59 | #ifdef CONFIG_CPU_PM | |
60 | u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)]; | |
61 | u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)]; | |
62 | u32 saved_spi_target[DIV_ROUND_UP(1020, 4)]; | |
63 | u32 __percpu *saved_ppi_enable; | |
64 | u32 __percpu *saved_ppi_conf; | |
65 | #endif | |
75294957 | 66 | struct irq_domain *domain; |
db0d4db2 MZ |
67 | unsigned int gic_irqs; |
68 | #ifdef CONFIG_GIC_NON_BANKED | |
69 | void __iomem *(*get_base)(union gic_base *); | |
70 | #endif | |
71 | }; | |
72 | ||
bd31b859 | 73 | static DEFINE_RAW_SPINLOCK(irq_controller_lock); |
f27ecacc | 74 | |
384a2902 NP |
75 | /* |
76 | * The GIC mapping of CPU interfaces does not necessarily match | |
77 | * the logical CPU numbering. Let's use a mapping as returned | |
78 | * by the GIC itself. | |
79 | */ | |
80 | #define NR_GIC_CPU_IF 8 | |
81 | static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly; | |
82 | ||
d7ed36a4 SS |
83 | /* |
84 | * Supported arch specific GIC irq extension. | |
85 | * Default make them NULL. | |
86 | */ | |
87 | struct irq_chip gic_arch_extn = { | |
1a01753e | 88 | .irq_eoi = NULL, |
d7ed36a4 SS |
89 | .irq_mask = NULL, |
90 | .irq_unmask = NULL, | |
91 | .irq_retrigger = NULL, | |
92 | .irq_set_type = NULL, | |
93 | .irq_set_wake = NULL, | |
94 | }; | |
95 | ||
b3a1bde4 CM |
96 | #ifndef MAX_GIC_NR |
97 | #define MAX_GIC_NR 1 | |
98 | #endif | |
99 | ||
bef8f9ee | 100 | static struct gic_chip_data gic_data[MAX_GIC_NR] __read_mostly; |
b3a1bde4 | 101 | |
db0d4db2 MZ |
102 | #ifdef CONFIG_GIC_NON_BANKED |
103 | static void __iomem *gic_get_percpu_base(union gic_base *base) | |
104 | { | |
513d1a28 | 105 | return raw_cpu_read(*base->percpu_base); |
db0d4db2 MZ |
106 | } |
107 | ||
108 | static void __iomem *gic_get_common_base(union gic_base *base) | |
109 | { | |
110 | return base->common_base; | |
111 | } | |
112 | ||
113 | static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data) | |
114 | { | |
115 | return data->get_base(&data->dist_base); | |
116 | } | |
117 | ||
118 | static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data) | |
119 | { | |
120 | return data->get_base(&data->cpu_base); | |
121 | } | |
122 | ||
123 | static inline void gic_set_base_accessor(struct gic_chip_data *data, | |
124 | void __iomem *(*f)(union gic_base *)) | |
125 | { | |
126 | data->get_base = f; | |
127 | } | |
128 | #else | |
129 | #define gic_data_dist_base(d) ((d)->dist_base.common_base) | |
130 | #define gic_data_cpu_base(d) ((d)->cpu_base.common_base) | |
46f101df | 131 | #define gic_set_base_accessor(d, f) |
db0d4db2 MZ |
132 | #endif |
133 | ||
7d1f4288 | 134 | static inline void __iomem *gic_dist_base(struct irq_data *d) |
b3a1bde4 | 135 | { |
7d1f4288 | 136 | struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d); |
db0d4db2 | 137 | return gic_data_dist_base(gic_data); |
b3a1bde4 CM |
138 | } |
139 | ||
7d1f4288 | 140 | static inline void __iomem *gic_cpu_base(struct irq_data *d) |
b3a1bde4 | 141 | { |
7d1f4288 | 142 | struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d); |
db0d4db2 | 143 | return gic_data_cpu_base(gic_data); |
b3a1bde4 CM |
144 | } |
145 | ||
7d1f4288 | 146 | static inline unsigned int gic_irq(struct irq_data *d) |
b3a1bde4 | 147 | { |
4294f8ba | 148 | return d->hwirq; |
b3a1bde4 CM |
149 | } |
150 | ||
f27ecacc RK |
151 | /* |
152 | * Routines to acknowledge, disable and enable interrupts | |
f27ecacc | 153 | */ |
7d1f4288 | 154 | static void gic_mask_irq(struct irq_data *d) |
f27ecacc | 155 | { |
4294f8ba | 156 | u32 mask = 1 << (gic_irq(d) % 32); |
c4bfa28a | 157 | |
bd31b859 | 158 | raw_spin_lock(&irq_controller_lock); |
6ac77e46 | 159 | writel_relaxed(mask, gic_dist_base(d) + GIC_DIST_ENABLE_CLEAR + (gic_irq(d) / 32) * 4); |
d7ed36a4 SS |
160 | if (gic_arch_extn.irq_mask) |
161 | gic_arch_extn.irq_mask(d); | |
bd31b859 | 162 | raw_spin_unlock(&irq_controller_lock); |
f27ecacc RK |
163 | } |
164 | ||
7d1f4288 | 165 | static void gic_unmask_irq(struct irq_data *d) |
f27ecacc | 166 | { |
4294f8ba | 167 | u32 mask = 1 << (gic_irq(d) % 32); |
c4bfa28a | 168 | |
bd31b859 | 169 | raw_spin_lock(&irq_controller_lock); |
d7ed36a4 SS |
170 | if (gic_arch_extn.irq_unmask) |
171 | gic_arch_extn.irq_unmask(d); | |
6ac77e46 | 172 | writel_relaxed(mask, gic_dist_base(d) + GIC_DIST_ENABLE_SET + (gic_irq(d) / 32) * 4); |
bd31b859 | 173 | raw_spin_unlock(&irq_controller_lock); |
f27ecacc RK |
174 | } |
175 | ||
1a01753e WD |
176 | static void gic_eoi_irq(struct irq_data *d) |
177 | { | |
178 | if (gic_arch_extn.irq_eoi) { | |
bd31b859 | 179 | raw_spin_lock(&irq_controller_lock); |
1a01753e | 180 | gic_arch_extn.irq_eoi(d); |
bd31b859 | 181 | raw_spin_unlock(&irq_controller_lock); |
1a01753e WD |
182 | } |
183 | ||
6ac77e46 | 184 | writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI); |
1a01753e WD |
185 | } |
186 | ||
7d1f4288 | 187 | static int gic_set_type(struct irq_data *d, unsigned int type) |
5c0c1f08 | 188 | { |
7d1f4288 LB |
189 | void __iomem *base = gic_dist_base(d); |
190 | unsigned int gicirq = gic_irq(d); | |
fb7e7deb | 191 | int ret; |
5c0c1f08 RV |
192 | |
193 | /* Interrupt configuration for SGIs can't be changed */ | |
194 | if (gicirq < 16) | |
195 | return -EINVAL; | |
196 | ||
fb7e7deb LD |
197 | /* SPIs have restrictions on the supported types */ |
198 | if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH && | |
199 | type != IRQ_TYPE_EDGE_RISING) | |
5c0c1f08 RV |
200 | return -EINVAL; |
201 | ||
bd31b859 | 202 | raw_spin_lock(&irq_controller_lock); |
5c0c1f08 | 203 | |
d7ed36a4 SS |
204 | if (gic_arch_extn.irq_set_type) |
205 | gic_arch_extn.irq_set_type(d, type); | |
206 | ||
fb7e7deb | 207 | ret = gic_configure_irq(gicirq, type, base, NULL); |
5c0c1f08 | 208 | |
bd31b859 | 209 | raw_spin_unlock(&irq_controller_lock); |
5c0c1f08 | 210 | |
fb7e7deb | 211 | return ret; |
5c0c1f08 RV |
212 | } |
213 | ||
d7ed36a4 SS |
214 | static int gic_retrigger(struct irq_data *d) |
215 | { | |
216 | if (gic_arch_extn.irq_retrigger) | |
217 | return gic_arch_extn.irq_retrigger(d); | |
218 | ||
bad9a43a AD |
219 | /* the genirq layer expects 0 if we can't retrigger in hardware */ |
220 | return 0; | |
d7ed36a4 SS |
221 | } |
222 | ||
a06f5466 | 223 | #ifdef CONFIG_SMP |
c191789c RK |
224 | static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, |
225 | bool force) | |
f27ecacc | 226 | { |
7d1f4288 | 227 | void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + (gic_irq(d) & ~3); |
ffde1de6 | 228 | unsigned int cpu, shift = (gic_irq(d) % 4) * 8; |
c191789c | 229 | u32 val, mask, bit; |
f27ecacc | 230 | |
ffde1de6 TG |
231 | if (!force) |
232 | cpu = cpumask_any_and(mask_val, cpu_online_mask); | |
233 | else | |
234 | cpu = cpumask_first(mask_val); | |
235 | ||
384a2902 | 236 | if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids) |
87507500 | 237 | return -EINVAL; |
c191789c | 238 | |
1a6b69b6 | 239 | raw_spin_lock(&irq_controller_lock); |
c191789c | 240 | mask = 0xff << shift; |
384a2902 | 241 | bit = gic_cpu_map[cpu] << shift; |
6ac77e46 SS |
242 | val = readl_relaxed(reg) & ~mask; |
243 | writel_relaxed(val | bit, reg); | |
bd31b859 | 244 | raw_spin_unlock(&irq_controller_lock); |
d5dedd45 | 245 | |
5dfc54e0 | 246 | return IRQ_SET_MASK_OK; |
f27ecacc | 247 | } |
a06f5466 | 248 | #endif |
f27ecacc | 249 | |
d7ed36a4 SS |
250 | #ifdef CONFIG_PM |
251 | static int gic_set_wake(struct irq_data *d, unsigned int on) | |
252 | { | |
253 | int ret = -ENXIO; | |
254 | ||
255 | if (gic_arch_extn.irq_set_wake) | |
256 | ret = gic_arch_extn.irq_set_wake(d, on); | |
257 | ||
258 | return ret; | |
259 | } | |
260 | ||
261 | #else | |
262 | #define gic_set_wake NULL | |
263 | #endif | |
264 | ||
8783dd3a | 265 | static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) |
562e0027 MZ |
266 | { |
267 | u32 irqstat, irqnr; | |
268 | struct gic_chip_data *gic = &gic_data[0]; | |
269 | void __iomem *cpu_base = gic_data_cpu_base(gic); | |
270 | ||
271 | do { | |
272 | irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK); | |
b8802f76 | 273 | irqnr = irqstat & GICC_IAR_INT_ID_MASK; |
562e0027 MZ |
274 | |
275 | if (likely(irqnr > 15 && irqnr < 1021)) { | |
60031b4e | 276 | handle_domain_irq(gic->domain, irqnr, regs); |
562e0027 MZ |
277 | continue; |
278 | } | |
279 | if (irqnr < 16) { | |
280 | writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI); | |
281 | #ifdef CONFIG_SMP | |
282 | handle_IPI(irqnr, regs); | |
283 | #endif | |
284 | continue; | |
285 | } | |
286 | break; | |
287 | } while (1); | |
288 | } | |
289 | ||
0f347bb9 | 290 | static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc) |
b3a1bde4 | 291 | { |
6845664a TG |
292 | struct gic_chip_data *chip_data = irq_get_handler_data(irq); |
293 | struct irq_chip *chip = irq_get_chip(irq); | |
0f347bb9 | 294 | unsigned int cascade_irq, gic_irq; |
b3a1bde4 CM |
295 | unsigned long status; |
296 | ||
1a01753e | 297 | chained_irq_enter(chip, desc); |
b3a1bde4 | 298 | |
bd31b859 | 299 | raw_spin_lock(&irq_controller_lock); |
db0d4db2 | 300 | status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK); |
bd31b859 | 301 | raw_spin_unlock(&irq_controller_lock); |
b3a1bde4 | 302 | |
e5f81539 FK |
303 | gic_irq = (status & GICC_IAR_INT_ID_MASK); |
304 | if (gic_irq == GICC_INT_SPURIOUS) | |
b3a1bde4 | 305 | goto out; |
b3a1bde4 | 306 | |
75294957 GL |
307 | cascade_irq = irq_find_mapping(chip_data->domain, gic_irq); |
308 | if (unlikely(gic_irq < 32 || gic_irq > 1020)) | |
aec00956 | 309 | handle_bad_irq(cascade_irq, desc); |
0f347bb9 RK |
310 | else |
311 | generic_handle_irq(cascade_irq); | |
b3a1bde4 CM |
312 | |
313 | out: | |
1a01753e | 314 | chained_irq_exit(chip, desc); |
b3a1bde4 CM |
315 | } |
316 | ||
38c677cb | 317 | static struct irq_chip gic_chip = { |
7d1f4288 | 318 | .name = "GIC", |
7d1f4288 LB |
319 | .irq_mask = gic_mask_irq, |
320 | .irq_unmask = gic_unmask_irq, | |
1a01753e | 321 | .irq_eoi = gic_eoi_irq, |
7d1f4288 | 322 | .irq_set_type = gic_set_type, |
d7ed36a4 | 323 | .irq_retrigger = gic_retrigger, |
f27ecacc | 324 | #ifdef CONFIG_SMP |
c191789c | 325 | .irq_set_affinity = gic_set_affinity, |
f27ecacc | 326 | #endif |
d7ed36a4 | 327 | .irq_set_wake = gic_set_wake, |
f27ecacc RK |
328 | }; |
329 | ||
b3a1bde4 CM |
330 | void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq) |
331 | { | |
332 | if (gic_nr >= MAX_GIC_NR) | |
333 | BUG(); | |
6845664a | 334 | if (irq_set_handler_data(irq, &gic_data[gic_nr]) != 0) |
b3a1bde4 | 335 | BUG(); |
6845664a | 336 | irq_set_chained_handler(irq, gic_handle_cascade_irq); |
b3a1bde4 CM |
337 | } |
338 | ||
2bb31351 RK |
339 | static u8 gic_get_cpumask(struct gic_chip_data *gic) |
340 | { | |
341 | void __iomem *base = gic_data_dist_base(gic); | |
342 | u32 mask, i; | |
343 | ||
344 | for (i = mask = 0; i < 32; i += 4) { | |
345 | mask = readl_relaxed(base + GIC_DIST_TARGET + i); | |
346 | mask |= mask >> 16; | |
347 | mask |= mask >> 8; | |
348 | if (mask) | |
349 | break; | |
350 | } | |
351 | ||
352 | if (!mask) | |
353 | pr_crit("GIC CPU mask not found - kernel will fail to boot.\n"); | |
354 | ||
355 | return mask; | |
356 | } | |
357 | ||
32289506 FK |
358 | static void gic_cpu_if_up(void) |
359 | { | |
360 | void __iomem *cpu_base = gic_data_cpu_base(&gic_data[0]); | |
361 | u32 bypass = 0; | |
362 | ||
363 | /* | |
364 | * Preserve bypass disable bits to be written back later | |
365 | */ | |
366 | bypass = readl(cpu_base + GIC_CPU_CTRL); | |
367 | bypass &= GICC_DIS_BYPASS_MASK; | |
368 | ||
369 | writel_relaxed(bypass | GICC_ENABLE, cpu_base + GIC_CPU_CTRL); | |
370 | } | |
371 | ||
372 | ||
4294f8ba | 373 | static void __init gic_dist_init(struct gic_chip_data *gic) |
f27ecacc | 374 | { |
75294957 | 375 | unsigned int i; |
267840f3 | 376 | u32 cpumask; |
4294f8ba | 377 | unsigned int gic_irqs = gic->gic_irqs; |
db0d4db2 | 378 | void __iomem *base = gic_data_dist_base(gic); |
f27ecacc | 379 | |
e5f81539 | 380 | writel_relaxed(GICD_DISABLE, base + GIC_DIST_CTRL); |
f27ecacc | 381 | |
f27ecacc RK |
382 | /* |
383 | * Set all global interrupts to this CPU only. | |
384 | */ | |
2bb31351 RK |
385 | cpumask = gic_get_cpumask(gic); |
386 | cpumask |= cpumask << 8; | |
387 | cpumask |= cpumask << 16; | |
e6afec9b | 388 | for (i = 32; i < gic_irqs; i += 4) |
6ac77e46 | 389 | writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4); |
f27ecacc | 390 | |
d51d0af4 | 391 | gic_dist_config(base, gic_irqs, NULL); |
f27ecacc | 392 | |
e5f81539 | 393 | writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL); |
f27ecacc RK |
394 | } |
395 | ||
8c37bb3a | 396 | static void gic_cpu_init(struct gic_chip_data *gic) |
f27ecacc | 397 | { |
db0d4db2 MZ |
398 | void __iomem *dist_base = gic_data_dist_base(gic); |
399 | void __iomem *base = gic_data_cpu_base(gic); | |
384a2902 | 400 | unsigned int cpu_mask, cpu = smp_processor_id(); |
9395f6ea RK |
401 | int i; |
402 | ||
384a2902 NP |
403 | /* |
404 | * Get what the GIC says our CPU mask is. | |
405 | */ | |
406 | BUG_ON(cpu >= NR_GIC_CPU_IF); | |
2bb31351 | 407 | cpu_mask = gic_get_cpumask(gic); |
384a2902 NP |
408 | gic_cpu_map[cpu] = cpu_mask; |
409 | ||
410 | /* | |
411 | * Clear our mask from the other map entries in case they're | |
412 | * still undefined. | |
413 | */ | |
414 | for (i = 0; i < NR_GIC_CPU_IF; i++) | |
415 | if (i != cpu) | |
416 | gic_cpu_map[i] &= ~cpu_mask; | |
417 | ||
d51d0af4 | 418 | gic_cpu_config(dist_base, NULL); |
9395f6ea | 419 | |
e5f81539 | 420 | writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK); |
32289506 | 421 | gic_cpu_if_up(); |
f27ecacc RK |
422 | } |
423 | ||
10d9eb8a NP |
424 | void gic_cpu_if_down(void) |
425 | { | |
426 | void __iomem *cpu_base = gic_data_cpu_base(&gic_data[0]); | |
32289506 FK |
427 | u32 val = 0; |
428 | ||
429 | val = readl(cpu_base + GIC_CPU_CTRL); | |
430 | val &= ~GICC_ENABLE; | |
431 | writel_relaxed(val, cpu_base + GIC_CPU_CTRL); | |
10d9eb8a NP |
432 | } |
433 | ||
254056f3 CC |
434 | #ifdef CONFIG_CPU_PM |
435 | /* | |
436 | * Saves the GIC distributor registers during suspend or idle. Must be called | |
437 | * with interrupts disabled but before powering down the GIC. After calling | |
438 | * this function, no interrupts will be delivered by the GIC, and another | |
439 | * platform-specific wakeup source must be enabled. | |
440 | */ | |
441 | static void gic_dist_save(unsigned int gic_nr) | |
442 | { | |
443 | unsigned int gic_irqs; | |
444 | void __iomem *dist_base; | |
445 | int i; | |
446 | ||
447 | if (gic_nr >= MAX_GIC_NR) | |
448 | BUG(); | |
449 | ||
450 | gic_irqs = gic_data[gic_nr].gic_irqs; | |
db0d4db2 | 451 | dist_base = gic_data_dist_base(&gic_data[gic_nr]); |
254056f3 CC |
452 | |
453 | if (!dist_base) | |
454 | return; | |
455 | ||
456 | for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++) | |
457 | gic_data[gic_nr].saved_spi_conf[i] = | |
458 | readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4); | |
459 | ||
460 | for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++) | |
461 | gic_data[gic_nr].saved_spi_target[i] = | |
462 | readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4); | |
463 | ||
464 | for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) | |
465 | gic_data[gic_nr].saved_spi_enable[i] = | |
466 | readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4); | |
467 | } | |
468 | ||
469 | /* | |
470 | * Restores the GIC distributor registers during resume or when coming out of | |
471 | * idle. Must be called before enabling interrupts. If a level interrupt | |
472 | * that occured while the GIC was suspended is still present, it will be | |
473 | * handled normally, but any edge interrupts that occured will not be seen by | |
474 | * the GIC and need to be handled by the platform-specific wakeup source. | |
475 | */ | |
476 | static void gic_dist_restore(unsigned int gic_nr) | |
477 | { | |
478 | unsigned int gic_irqs; | |
479 | unsigned int i; | |
480 | void __iomem *dist_base; | |
481 | ||
482 | if (gic_nr >= MAX_GIC_NR) | |
483 | BUG(); | |
484 | ||
485 | gic_irqs = gic_data[gic_nr].gic_irqs; | |
db0d4db2 | 486 | dist_base = gic_data_dist_base(&gic_data[gic_nr]); |
254056f3 CC |
487 | |
488 | if (!dist_base) | |
489 | return; | |
490 | ||
e5f81539 | 491 | writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL); |
254056f3 CC |
492 | |
493 | for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++) | |
494 | writel_relaxed(gic_data[gic_nr].saved_spi_conf[i], | |
495 | dist_base + GIC_DIST_CONFIG + i * 4); | |
496 | ||
497 | for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++) | |
e5f81539 | 498 | writel_relaxed(GICD_INT_DEF_PRI_X4, |
254056f3 CC |
499 | dist_base + GIC_DIST_PRI + i * 4); |
500 | ||
501 | for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++) | |
502 | writel_relaxed(gic_data[gic_nr].saved_spi_target[i], | |
503 | dist_base + GIC_DIST_TARGET + i * 4); | |
504 | ||
505 | for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) | |
506 | writel_relaxed(gic_data[gic_nr].saved_spi_enable[i], | |
507 | dist_base + GIC_DIST_ENABLE_SET + i * 4); | |
508 | ||
e5f81539 | 509 | writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL); |
254056f3 CC |
510 | } |
511 | ||
512 | static void gic_cpu_save(unsigned int gic_nr) | |
513 | { | |
514 | int i; | |
515 | u32 *ptr; | |
516 | void __iomem *dist_base; | |
517 | void __iomem *cpu_base; | |
518 | ||
519 | if (gic_nr >= MAX_GIC_NR) | |
520 | BUG(); | |
521 | ||
db0d4db2 MZ |
522 | dist_base = gic_data_dist_base(&gic_data[gic_nr]); |
523 | cpu_base = gic_data_cpu_base(&gic_data[gic_nr]); | |
254056f3 CC |
524 | |
525 | if (!dist_base || !cpu_base) | |
526 | return; | |
527 | ||
532d0d06 | 528 | ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable); |
254056f3 CC |
529 | for (i = 0; i < DIV_ROUND_UP(32, 32); i++) |
530 | ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4); | |
531 | ||
532d0d06 | 532 | ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf); |
254056f3 CC |
533 | for (i = 0; i < DIV_ROUND_UP(32, 16); i++) |
534 | ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4); | |
535 | ||
536 | } | |
537 | ||
538 | static void gic_cpu_restore(unsigned int gic_nr) | |
539 | { | |
540 | int i; | |
541 | u32 *ptr; | |
542 | void __iomem *dist_base; | |
543 | void __iomem *cpu_base; | |
544 | ||
545 | if (gic_nr >= MAX_GIC_NR) | |
546 | BUG(); | |
547 | ||
db0d4db2 MZ |
548 | dist_base = gic_data_dist_base(&gic_data[gic_nr]); |
549 | cpu_base = gic_data_cpu_base(&gic_data[gic_nr]); | |
254056f3 CC |
550 | |
551 | if (!dist_base || !cpu_base) | |
552 | return; | |
553 | ||
532d0d06 | 554 | ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable); |
254056f3 CC |
555 | for (i = 0; i < DIV_ROUND_UP(32, 32); i++) |
556 | writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4); | |
557 | ||
532d0d06 | 558 | ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf); |
254056f3 CC |
559 | for (i = 0; i < DIV_ROUND_UP(32, 16); i++) |
560 | writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4); | |
561 | ||
562 | for (i = 0; i < DIV_ROUND_UP(32, 4); i++) | |
e5f81539 FK |
563 | writel_relaxed(GICD_INT_DEF_PRI_X4, |
564 | dist_base + GIC_DIST_PRI + i * 4); | |
254056f3 | 565 | |
e5f81539 | 566 | writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK); |
32289506 | 567 | gic_cpu_if_up(); |
254056f3 CC |
568 | } |
569 | ||
570 | static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v) | |
571 | { | |
572 | int i; | |
573 | ||
574 | for (i = 0; i < MAX_GIC_NR; i++) { | |
db0d4db2 MZ |
575 | #ifdef CONFIG_GIC_NON_BANKED |
576 | /* Skip over unused GICs */ | |
577 | if (!gic_data[i].get_base) | |
578 | continue; | |
579 | #endif | |
254056f3 CC |
580 | switch (cmd) { |
581 | case CPU_PM_ENTER: | |
582 | gic_cpu_save(i); | |
583 | break; | |
584 | case CPU_PM_ENTER_FAILED: | |
585 | case CPU_PM_EXIT: | |
586 | gic_cpu_restore(i); | |
587 | break; | |
588 | case CPU_CLUSTER_PM_ENTER: | |
589 | gic_dist_save(i); | |
590 | break; | |
591 | case CPU_CLUSTER_PM_ENTER_FAILED: | |
592 | case CPU_CLUSTER_PM_EXIT: | |
593 | gic_dist_restore(i); | |
594 | break; | |
595 | } | |
596 | } | |
597 | ||
598 | return NOTIFY_OK; | |
599 | } | |
600 | ||
601 | static struct notifier_block gic_notifier_block = { | |
602 | .notifier_call = gic_notifier, | |
603 | }; | |
604 | ||
605 | static void __init gic_pm_init(struct gic_chip_data *gic) | |
606 | { | |
607 | gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4, | |
608 | sizeof(u32)); | |
609 | BUG_ON(!gic->saved_ppi_enable); | |
610 | ||
611 | gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4, | |
612 | sizeof(u32)); | |
613 | BUG_ON(!gic->saved_ppi_conf); | |
614 | ||
abdd7b91 MZ |
615 | if (gic == &gic_data[0]) |
616 | cpu_pm_register_notifier(&gic_notifier_block); | |
254056f3 CC |
617 | } |
618 | #else | |
619 | static void __init gic_pm_init(struct gic_chip_data *gic) | |
620 | { | |
621 | } | |
622 | #endif | |
623 | ||
b1cffebf | 624 | #ifdef CONFIG_SMP |
6859358e | 625 | static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq) |
b1cffebf RH |
626 | { |
627 | int cpu; | |
1a6b69b6 NP |
628 | unsigned long flags, map = 0; |
629 | ||
630 | raw_spin_lock_irqsave(&irq_controller_lock, flags); | |
b1cffebf RH |
631 | |
632 | /* Convert our logical CPU mask into a physical one. */ | |
633 | for_each_cpu(cpu, mask) | |
91bdf0d0 | 634 | map |= gic_cpu_map[cpu]; |
b1cffebf RH |
635 | |
636 | /* | |
637 | * Ensure that stores to Normal memory are visible to the | |
8adbf57f | 638 | * other CPUs before they observe us issuing the IPI. |
b1cffebf | 639 | */ |
8adbf57f | 640 | dmb(ishst); |
b1cffebf RH |
641 | |
642 | /* this always happens on GIC0 */ | |
643 | writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); | |
1a6b69b6 NP |
644 | |
645 | raw_spin_unlock_irqrestore(&irq_controller_lock, flags); | |
646 | } | |
647 | #endif | |
648 | ||
649 | #ifdef CONFIG_BL_SWITCHER | |
14d2ca61 NP |
650 | /* |
651 | * gic_send_sgi - send a SGI directly to given CPU interface number | |
652 | * | |
653 | * cpu_id: the ID for the destination CPU interface | |
654 | * irq: the IPI number to send a SGI for | |
655 | */ | |
656 | void gic_send_sgi(unsigned int cpu_id, unsigned int irq) | |
657 | { | |
658 | BUG_ON(cpu_id >= NR_GIC_CPU_IF); | |
659 | cpu_id = 1 << cpu_id; | |
660 | /* this always happens on GIC0 */ | |
661 | writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); | |
662 | } | |
663 | ||
ed96762e NP |
664 | /* |
665 | * gic_get_cpu_id - get the CPU interface ID for the specified CPU | |
666 | * | |
667 | * @cpu: the logical CPU number to get the GIC ID for. | |
668 | * | |
669 | * Return the CPU interface ID for the given logical CPU number, | |
670 | * or -1 if the CPU number is too large or the interface ID is | |
671 | * unknown (more than one bit set). | |
672 | */ | |
673 | int gic_get_cpu_id(unsigned int cpu) | |
674 | { | |
675 | unsigned int cpu_bit; | |
676 | ||
677 | if (cpu >= NR_GIC_CPU_IF) | |
678 | return -1; | |
679 | cpu_bit = gic_cpu_map[cpu]; | |
680 | if (cpu_bit & (cpu_bit - 1)) | |
681 | return -1; | |
682 | return __ffs(cpu_bit); | |
683 | } | |
684 | ||
1a6b69b6 NP |
685 | /* |
686 | * gic_migrate_target - migrate IRQs to another CPU interface | |
687 | * | |
688 | * @new_cpu_id: the CPU target ID to migrate IRQs to | |
689 | * | |
690 | * Migrate all peripheral interrupts with a target matching the current CPU | |
691 | * to the interface corresponding to @new_cpu_id. The CPU interface mapping | |
692 | * is also updated. Targets to other CPU interfaces are unchanged. | |
693 | * This must be called with IRQs locally disabled. | |
694 | */ | |
695 | void gic_migrate_target(unsigned int new_cpu_id) | |
696 | { | |
697 | unsigned int cur_cpu_id, gic_irqs, gic_nr = 0; | |
698 | void __iomem *dist_base; | |
699 | int i, ror_val, cpu = smp_processor_id(); | |
700 | u32 val, cur_target_mask, active_mask; | |
701 | ||
702 | if (gic_nr >= MAX_GIC_NR) | |
703 | BUG(); | |
704 | ||
705 | dist_base = gic_data_dist_base(&gic_data[gic_nr]); | |
706 | if (!dist_base) | |
707 | return; | |
708 | gic_irqs = gic_data[gic_nr].gic_irqs; | |
709 | ||
710 | cur_cpu_id = __ffs(gic_cpu_map[cpu]); | |
711 | cur_target_mask = 0x01010101 << cur_cpu_id; | |
712 | ror_val = (cur_cpu_id - new_cpu_id) & 31; | |
713 | ||
714 | raw_spin_lock(&irq_controller_lock); | |
715 | ||
716 | /* Update the target interface for this logical CPU */ | |
717 | gic_cpu_map[cpu] = 1 << new_cpu_id; | |
718 | ||
719 | /* | |
720 | * Find all the peripheral interrupts targetting the current | |
721 | * CPU interface and migrate them to the new CPU interface. | |
722 | * We skip DIST_TARGET 0 to 7 as they are read-only. | |
723 | */ | |
724 | for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) { | |
725 | val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4); | |
726 | active_mask = val & cur_target_mask; | |
727 | if (active_mask) { | |
728 | val &= ~active_mask; | |
729 | val |= ror32(active_mask, ror_val); | |
730 | writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4); | |
731 | } | |
732 | } | |
733 | ||
734 | raw_spin_unlock(&irq_controller_lock); | |
735 | ||
736 | /* | |
737 | * Now let's migrate and clear any potential SGIs that might be | |
738 | * pending for us (cur_cpu_id). Since GIC_DIST_SGI_PENDING_SET | |
739 | * is a banked register, we can only forward the SGI using | |
740 | * GIC_DIST_SOFTINT. The original SGI source is lost but Linux | |
741 | * doesn't use that information anyway. | |
742 | * | |
743 | * For the same reason we do not adjust SGI source information | |
744 | * for previously sent SGIs by us to other CPUs either. | |
745 | */ | |
746 | for (i = 0; i < 16; i += 4) { | |
747 | int j; | |
748 | val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i); | |
749 | if (!val) | |
750 | continue; | |
751 | writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i); | |
752 | for (j = i; j < i + 4; j++) { | |
753 | if (val & 0xff) | |
754 | writel_relaxed((1 << (new_cpu_id + 16)) | j, | |
755 | dist_base + GIC_DIST_SOFTINT); | |
756 | val >>= 8; | |
757 | } | |
758 | } | |
b1cffebf | 759 | } |
eeb44658 NP |
760 | |
761 | /* | |
762 | * gic_get_sgir_physaddr - get the physical address for the SGI register | |
763 | * | |
764 | * REturn the physical address of the SGI register to be used | |
765 | * by some early assembly code when the kernel is not yet available. | |
766 | */ | |
767 | static unsigned long gic_dist_physaddr; | |
768 | ||
769 | unsigned long gic_get_sgir_physaddr(void) | |
770 | { | |
771 | if (!gic_dist_physaddr) | |
772 | return 0; | |
773 | return gic_dist_physaddr + GIC_DIST_SOFTINT; | |
774 | } | |
775 | ||
776 | void __init gic_init_physaddr(struct device_node *node) | |
777 | { | |
778 | struct resource res; | |
779 | if (of_address_to_resource(node, 0, &res) == 0) { | |
780 | gic_dist_physaddr = res.start; | |
781 | pr_info("GIC physical location is %#lx\n", gic_dist_physaddr); | |
782 | } | |
783 | } | |
784 | ||
785 | #else | |
786 | #define gic_init_physaddr(node) do { } while (0) | |
b1cffebf RH |
787 | #endif |
788 | ||
75294957 GL |
789 | static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq, |
790 | irq_hw_number_t hw) | |
791 | { | |
792 | if (hw < 32) { | |
793 | irq_set_percpu_devid(irq); | |
9a1091ef YC |
794 | irq_domain_set_info(d, irq, hw, &gic_chip, d->host_data, |
795 | handle_percpu_devid_irq, NULL, NULL); | |
75294957 GL |
796 | set_irq_flags(irq, IRQF_VALID | IRQF_NOAUTOEN); |
797 | } else { | |
9a1091ef YC |
798 | irq_domain_set_info(d, irq, hw, &gic_chip, d->host_data, |
799 | handle_fasteoi_irq, NULL, NULL); | |
75294957 | 800 | set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); |
006e983b S |
801 | |
802 | gic_routable_irq_domain_ops->map(d, irq, hw); | |
75294957 | 803 | } |
75294957 GL |
804 | return 0; |
805 | } | |
806 | ||
006e983b S |
807 | static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq) |
808 | { | |
809 | gic_routable_irq_domain_ops->unmap(d, irq); | |
810 | } | |
811 | ||
7bb69bad GL |
812 | static int gic_irq_domain_xlate(struct irq_domain *d, |
813 | struct device_node *controller, | |
814 | const u32 *intspec, unsigned int intsize, | |
815 | unsigned long *out_hwirq, unsigned int *out_type) | |
b3f7ed03 | 816 | { |
006e983b S |
817 | unsigned long ret = 0; |
818 | ||
b3f7ed03 RH |
819 | if (d->of_node != controller) |
820 | return -EINVAL; | |
821 | if (intsize < 3) | |
822 | return -EINVAL; | |
823 | ||
824 | /* Get the interrupt number and add 16 to skip over SGIs */ | |
825 | *out_hwirq = intspec[1] + 16; | |
826 | ||
827 | /* For SPIs, we need to add 16 more to get the GIC irq ID number */ | |
006e983b S |
828 | if (!intspec[0]) { |
829 | ret = gic_routable_irq_domain_ops->xlate(d, controller, | |
830 | intspec, | |
831 | intsize, | |
832 | out_hwirq, | |
833 | out_type); | |
834 | ||
835 | if (IS_ERR_VALUE(ret)) | |
836 | return ret; | |
837 | } | |
b3f7ed03 RH |
838 | |
839 | *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK; | |
006e983b S |
840 | |
841 | return ret; | |
b3f7ed03 | 842 | } |
b3f7ed03 | 843 | |
c0114709 | 844 | #ifdef CONFIG_SMP |
8c37bb3a PG |
845 | static int gic_secondary_init(struct notifier_block *nfb, unsigned long action, |
846 | void *hcpu) | |
c0114709 | 847 | { |
8b6fd652 | 848 | if (action == CPU_STARTING || action == CPU_STARTING_FROZEN) |
c0114709 CM |
849 | gic_cpu_init(&gic_data[0]); |
850 | return NOTIFY_OK; | |
851 | } | |
852 | ||
853 | /* | |
854 | * Notifier for enabling the GIC CPU interface. Set an arbitrarily high | |
855 | * priority because the GIC needs to be up before the ARM generic timers. | |
856 | */ | |
8c37bb3a | 857 | static struct notifier_block gic_cpu_notifier = { |
c0114709 CM |
858 | .notifier_call = gic_secondary_init, |
859 | .priority = 100, | |
860 | }; | |
861 | #endif | |
862 | ||
9a1091ef YC |
863 | static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, |
864 | unsigned int nr_irqs, void *arg) | |
865 | { | |
866 | int i, ret; | |
867 | irq_hw_number_t hwirq; | |
868 | unsigned int type = IRQ_TYPE_NONE; | |
869 | struct of_phandle_args *irq_data = arg; | |
870 | ||
871 | ret = gic_irq_domain_xlate(domain, irq_data->np, irq_data->args, | |
872 | irq_data->args_count, &hwirq, &type); | |
873 | if (ret) | |
874 | return ret; | |
875 | ||
876 | for (i = 0; i < nr_irqs; i++) | |
877 | gic_irq_domain_map(domain, virq + i, hwirq + i); | |
878 | ||
879 | return 0; | |
880 | } | |
881 | ||
882 | static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = { | |
883 | .xlate = gic_irq_domain_xlate, | |
884 | .alloc = gic_irq_domain_alloc, | |
885 | .free = irq_domain_free_irqs_top, | |
886 | }; | |
887 | ||
6859358e | 888 | static const struct irq_domain_ops gic_irq_domain_ops = { |
75294957 | 889 | .map = gic_irq_domain_map, |
006e983b | 890 | .unmap = gic_irq_domain_unmap, |
7bb69bad | 891 | .xlate = gic_irq_domain_xlate, |
4294f8ba RH |
892 | }; |
893 | ||
006e983b S |
894 | /* Default functions for routable irq domain */ |
895 | static int gic_routable_irq_domain_map(struct irq_domain *d, unsigned int irq, | |
896 | irq_hw_number_t hw) | |
897 | { | |
898 | return 0; | |
899 | } | |
900 | ||
901 | static void gic_routable_irq_domain_unmap(struct irq_domain *d, | |
902 | unsigned int irq) | |
903 | { | |
904 | } | |
905 | ||
906 | static int gic_routable_irq_domain_xlate(struct irq_domain *d, | |
907 | struct device_node *controller, | |
908 | const u32 *intspec, unsigned int intsize, | |
909 | unsigned long *out_hwirq, | |
910 | unsigned int *out_type) | |
911 | { | |
912 | *out_hwirq += 16; | |
913 | return 0; | |
914 | } | |
915 | ||
f3d147b8 | 916 | static const struct irq_domain_ops gic_default_routable_irq_domain_ops = { |
006e983b S |
917 | .map = gic_routable_irq_domain_map, |
918 | .unmap = gic_routable_irq_domain_unmap, | |
919 | .xlate = gic_routable_irq_domain_xlate, | |
920 | }; | |
921 | ||
922 | const struct irq_domain_ops *gic_routable_irq_domain_ops = | |
923 | &gic_default_routable_irq_domain_ops; | |
924 | ||
db0d4db2 MZ |
925 | void __init gic_init_bases(unsigned int gic_nr, int irq_start, |
926 | void __iomem *dist_base, void __iomem *cpu_base, | |
75294957 | 927 | u32 percpu_offset, struct device_node *node) |
b580b899 | 928 | { |
75294957 | 929 | irq_hw_number_t hwirq_base; |
bef8f9ee | 930 | struct gic_chip_data *gic; |
384a2902 | 931 | int gic_irqs, irq_base, i; |
006e983b | 932 | int nr_routable_irqs; |
bef8f9ee RK |
933 | |
934 | BUG_ON(gic_nr >= MAX_GIC_NR); | |
935 | ||
936 | gic = &gic_data[gic_nr]; | |
db0d4db2 MZ |
937 | #ifdef CONFIG_GIC_NON_BANKED |
938 | if (percpu_offset) { /* Frankein-GIC without banked registers... */ | |
939 | unsigned int cpu; | |
940 | ||
941 | gic->dist_base.percpu_base = alloc_percpu(void __iomem *); | |
942 | gic->cpu_base.percpu_base = alloc_percpu(void __iomem *); | |
943 | if (WARN_ON(!gic->dist_base.percpu_base || | |
944 | !gic->cpu_base.percpu_base)) { | |
945 | free_percpu(gic->dist_base.percpu_base); | |
946 | free_percpu(gic->cpu_base.percpu_base); | |
947 | return; | |
948 | } | |
949 | ||
950 | for_each_possible_cpu(cpu) { | |
29e697b1 TF |
951 | u32 mpidr = cpu_logical_map(cpu); |
952 | u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0); | |
953 | unsigned long offset = percpu_offset * core_id; | |
db0d4db2 MZ |
954 | *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset; |
955 | *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset; | |
956 | } | |
957 | ||
958 | gic_set_base_accessor(gic, gic_get_percpu_base); | |
959 | } else | |
960 | #endif | |
961 | { /* Normal, sane GIC... */ | |
962 | WARN(percpu_offset, | |
963 | "GIC_NON_BANKED not enabled, ignoring %08x offset!", | |
964 | percpu_offset); | |
965 | gic->dist_base.common_base = dist_base; | |
966 | gic->cpu_base.common_base = cpu_base; | |
967 | gic_set_base_accessor(gic, gic_get_common_base); | |
968 | } | |
bef8f9ee | 969 | |
384a2902 NP |
970 | /* |
971 | * Initialize the CPU interface map to all CPUs. | |
972 | * It will be refined as each CPU probes its ID. | |
973 | */ | |
974 | for (i = 0; i < NR_GIC_CPU_IF; i++) | |
975 | gic_cpu_map[i] = 0xff; | |
976 | ||
4294f8ba RH |
977 | /* |
978 | * Find out how many interrupts are supported. | |
979 | * The GIC only supports up to 1020 interrupt sources. | |
980 | */ | |
db0d4db2 | 981 | gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f; |
4294f8ba RH |
982 | gic_irqs = (gic_irqs + 1) * 32; |
983 | if (gic_irqs > 1020) | |
984 | gic_irqs = 1020; | |
985 | gic->gic_irqs = gic_irqs; | |
986 | ||
9a1091ef YC |
987 | if (node) { /* DT case */ |
988 | const struct irq_domain_ops *ops = &gic_irq_domain_hierarchy_ops; | |
989 | ||
990 | if (!of_property_read_u32(node, "arm,routable-irqs", | |
991 | &nr_routable_irqs)) { | |
992 | ops = &gic_irq_domain_ops; | |
993 | gic_irqs = nr_routable_irqs; | |
994 | } | |
995 | ||
996 | gic->domain = irq_domain_add_linear(node, gic_irqs, ops, gic); | |
997 | } else { /* Non-DT case */ | |
998 | /* | |
999 | * For primary GICs, skip over SGIs. | |
1000 | * For secondary GICs, skip over PPIs, too. | |
1001 | */ | |
1002 | if (gic_nr == 0 && (irq_start & 31) > 0) { | |
1003 | hwirq_base = 16; | |
1004 | if (irq_start != -1) | |
1005 | irq_start = (irq_start & ~31) + 16; | |
1006 | } else { | |
1007 | hwirq_base = 32; | |
1008 | } | |
1009 | ||
1010 | gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */ | |
006e983b | 1011 | |
006e983b S |
1012 | irq_base = irq_alloc_descs(irq_start, 16, gic_irqs, |
1013 | numa_node_id()); | |
1014 | if (IS_ERR_VALUE(irq_base)) { | |
1015 | WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n", | |
1016 | irq_start); | |
1017 | irq_base = irq_start; | |
1018 | } | |
1019 | ||
1020 | gic->domain = irq_domain_add_legacy(node, gic_irqs, irq_base, | |
1021 | hwirq_base, &gic_irq_domain_ops, gic); | |
f37a53cc | 1022 | } |
006e983b | 1023 | |
75294957 GL |
1024 | if (WARN_ON(!gic->domain)) |
1025 | return; | |
bef8f9ee | 1026 | |
08332dff | 1027 | if (gic_nr == 0) { |
b1cffebf | 1028 | #ifdef CONFIG_SMP |
08332dff MR |
1029 | set_smp_cross_call(gic_raise_softirq); |
1030 | register_cpu_notifier(&gic_cpu_notifier); | |
b1cffebf | 1031 | #endif |
08332dff MR |
1032 | set_handle_irq(gic_handle_irq); |
1033 | } | |
cfed7d60 | 1034 | |
9c12845e | 1035 | gic_chip.flags |= gic_arch_extn.flags; |
4294f8ba | 1036 | gic_dist_init(gic); |
bef8f9ee | 1037 | gic_cpu_init(gic); |
254056f3 | 1038 | gic_pm_init(gic); |
b580b899 RK |
1039 | } |
1040 | ||
b3f7ed03 | 1041 | #ifdef CONFIG_OF |
46f101df | 1042 | static int gic_cnt __initdata; |
b3f7ed03 | 1043 | |
6859358e SB |
1044 | static int __init |
1045 | gic_of_init(struct device_node *node, struct device_node *parent) | |
b3f7ed03 RH |
1046 | { |
1047 | void __iomem *cpu_base; | |
1048 | void __iomem *dist_base; | |
db0d4db2 | 1049 | u32 percpu_offset; |
b3f7ed03 | 1050 | int irq; |
b3f7ed03 RH |
1051 | |
1052 | if (WARN_ON(!node)) | |
1053 | return -ENODEV; | |
1054 | ||
1055 | dist_base = of_iomap(node, 0); | |
1056 | WARN(!dist_base, "unable to map gic dist registers\n"); | |
1057 | ||
1058 | cpu_base = of_iomap(node, 1); | |
1059 | WARN(!cpu_base, "unable to map gic cpu registers\n"); | |
1060 | ||
db0d4db2 MZ |
1061 | if (of_property_read_u32(node, "cpu-offset", &percpu_offset)) |
1062 | percpu_offset = 0; | |
1063 | ||
75294957 | 1064 | gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset, node); |
eeb44658 NP |
1065 | if (!gic_cnt) |
1066 | gic_init_physaddr(node); | |
b3f7ed03 RH |
1067 | |
1068 | if (parent) { | |
1069 | irq = irq_of_parse_and_map(node, 0); | |
1070 | gic_cascade_irq(gic_cnt, irq); | |
1071 | } | |
853a33ce SS |
1072 | |
1073 | if (IS_ENABLED(CONFIG_ARM_GIC_V2M)) | |
1074 | gicv2m_of_init(node, gic_data[gic_cnt].domain); | |
1075 | ||
b3f7ed03 RH |
1076 | gic_cnt++; |
1077 | return 0; | |
1078 | } | |
144cb088 | 1079 | IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init); |
fa6e2eec LW |
1080 | IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init); |
1081 | IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init); | |
81243e44 RH |
1082 | IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init); |
1083 | IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init); | |
a97e8027 | 1084 | IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init); |
81243e44 RH |
1085 | IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init); |
1086 | IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init); | |
1087 | ||
b3f7ed03 | 1088 | #endif |