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irqchip: Prepare for local stub header removal
[linux-2.6-block.git] / drivers / irqchip / irq-mips-gic.c
CommitLineData
2299c49d
SH		 1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2008 Ralf Baechle (ralf@linux-mips.org)
7 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
8 */
39b8d525 9#include <linux/bitmap.h>
fb8f7be1 10#include <linux/clocksource.h>
39b8d525 11#include <linux/init.h>
18743d27 12#include <linux/interrupt.h>
fb8f7be1 13#include <linux/irq.h>
41a83e06 14#include <linux/irqchip.h>
4060bbe9 15#include <linux/irqchip/mips-gic.h>
a7057270 16#include <linux/of_address.h>
18743d27 17#include <linux/sched.h>
631330f5 18#include <linux/smp.h>
39b8d525 19
a7057270 20#include <asm/mips-cm.h>
98b67c37
SH		 21#include <asm/setup.h>
22#include <asm/traps.h>
39b8d525 23
a7057270
AB		 24#include <dt-bindings/interrupt-controller/mips-gic.h>
25
ff86714f 26unsigned int gic_present;
98b67c37 27
822350bc 28struct gic_pcpu_mask {
fbd55241 29 DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS);
822350bc
JD		 30};
31
5f68fea0 32static void __iomem *gic_base;
0b271f56 33static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
95150ae8 34static DEFINE_SPINLOCK(gic_lock);
c49581a4 35static struct irq_domain *gic_irq_domain;
fbd55241 36static int gic_shared_intrs;
e9de688d 37static int gic_vpes;
3263d085 38static unsigned int gic_cpu_pin;
1b6af71a 39static unsigned int timer_cpu_pin;
4a6a3ea3 40static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller;
39b8d525 41
18743d27
AB		 42static void __gic_irq_dispatch(void);
43
5f68fea0
AB		 44static inline unsigned int gic_read(unsigned int reg)
45{
46 return __raw_readl(gic_base + reg);
47}
48
49static inline void gic_write(unsigned int reg, unsigned int val)
50{
51 __raw_writel(val, gic_base + reg);
52}
53
54static inline void gic_update_bits(unsigned int reg, unsigned int mask,
55 unsigned int val)
56{
57 unsigned int regval;
58
59 regval = gic_read(reg);
60 regval &= ~mask;
61 regval |= val;
62 gic_write(reg, regval);
63}
64
65static inline void gic_reset_mask(unsigned int intr)
66{
67 gic_write(GIC_REG(SHARED, GIC_SH_RMASK) + GIC_INTR_OFS(intr),
68 1 << GIC_INTR_BIT(intr));
69}
70
71static inline void gic_set_mask(unsigned int intr)
72{
73 gic_write(GIC_REG(SHARED, GIC_SH_SMASK) + GIC_INTR_OFS(intr),
74 1 << GIC_INTR_BIT(intr));
75}
76
77static inline void gic_set_polarity(unsigned int intr, unsigned int pol)
78{
79 gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_POLARITY) +
80 GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr),
81 pol << GIC_INTR_BIT(intr));
82}
83
84static inline void gic_set_trigger(unsigned int intr, unsigned int trig)
85{
86 gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_TRIGGER) +
87 GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr),
88 trig << GIC_INTR_BIT(intr));
89}
90
91static inline void gic_set_dual_edge(unsigned int intr, unsigned int dual)
92{
93 gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_DUAL) + GIC_INTR_OFS(intr),
94 1 << GIC_INTR_BIT(intr),
95 dual << GIC_INTR_BIT(intr));
96}
97
98static inline void gic_map_to_pin(unsigned int intr, unsigned int pin)
99{
100 gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_PIN_BASE) +
101 GIC_SH_MAP_TO_PIN(intr), GIC_MAP_TO_PIN_MSK | pin);
102}
103
104static inline void gic_map_to_vpe(unsigned int intr, unsigned int vpe)
105{
106 gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_VPE_BASE) +
107 GIC_SH_MAP_TO_VPE_REG_OFF(intr, vpe),
108 GIC_SH_MAP_TO_VPE_REG_BIT(vpe));
109}
110
a331ce63 111#ifdef CONFIG_CLKSRC_MIPS_GIC
dfa762e1
SH		 112cycle_t gic_read_count(void)
113{
114 unsigned int hi, hi2, lo;
115
116 do {
5f68fea0
AB		 117 hi = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32));
118 lo = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_31_00));
119 hi2 = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32));
dfa762e1
SH		 120 } while (hi2 != hi);
121
122 return (((cycle_t) hi) << 32) + lo;
123}
0ab2b7d0 124
387904ff
AB		 125unsigned int gic_get_count_width(void)
126{
127 unsigned int bits, config;
128
5f68fea0 129 config = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
387904ff
AB		 130 bits = 32 + 4 * ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >>
131 GIC_SH_CONFIG_COUNTBITS_SHF);
132
133 return bits;
134}
135
0ab2b7d0
RG		 136void gic_write_compare(cycle_t cnt)
137{
5f68fea0 138 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI),
0ab2b7d0 139 (int)(cnt >> 32));
5f68fea0 140 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO),
0ab2b7d0
RG		 141 (int)(cnt & 0xffffffff));
142}
143
414408d0
PB		 144void gic_write_cpu_compare(cycle_t cnt, int cpu)
145{
146 unsigned long flags;
147
148 local_irq_save(flags);
149
5f68fea0
AB		 150 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), cpu);
151 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_HI),
414408d0 152 (int)(cnt >> 32));
5f68fea0 153 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_LO),
414408d0
PB		 154 (int)(cnt & 0xffffffff));
155
156 local_irq_restore(flags);
157}
158
0ab2b7d0
RG		 159cycle_t gic_read_compare(void)
160{
161 unsigned int hi, lo;
162
5f68fea0
AB		 163 hi = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI));
164 lo = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO));
0ab2b7d0
RG		 165
166 return (((cycle_t) hi) << 32) + lo;
167}
8fa4b930
MC		 168
169void gic_start_count(void)
170{
171 u32 gicconfig;
172
173 /* Start the counter */
174 gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
175 gicconfig &= ~(1 << GIC_SH_CONFIG_COUNTSTOP_SHF);
176 gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
177}
178
179void gic_stop_count(void)
180{
181 u32 gicconfig;
182
183 /* Stop the counter */
184 gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
185 gicconfig |= 1 << GIC_SH_CONFIG_COUNTSTOP_SHF;
186 gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
187}
188
dfa762e1
SH		 189#endif
190
e9de688d
AB		 191static bool gic_local_irq_is_routable(int intr)
192{
193 u32 vpe_ctl;
194
195 /* All local interrupts are routable in EIC mode. */
196 if (cpu_has_veic)
197 return true;
198
5f68fea0 199 vpe_ctl = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_CTL));
e9de688d
AB		 200 switch (intr) {
201 case GIC_LOCAL_INT_TIMER:
202 return vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK;
203 case GIC_LOCAL_INT_PERFCTR:
204 return vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK;
205 case GIC_LOCAL_INT_FDC:
206 return vpe_ctl & GIC_VPE_CTL_FDC_RTBL_MSK;
207 case GIC_LOCAL_INT_SWINT0:
208 case GIC_LOCAL_INT_SWINT1:
209 return vpe_ctl & GIC_VPE_CTL_SWINT_RTBL_MSK;
210 default:
211 return true;
212 }
213}
214
3263d085 215static void gic_bind_eic_interrupt(int irq, int set)
98b67c37
SH		 216{
217 /* Convert irq vector # to hw int # */
218 irq -= GIC_PIN_TO_VEC_OFFSET;
219
220 /* Set irq to use shadow set */
5f68fea0
AB		 221 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_EIC_SHADOW_SET_BASE) +
222 GIC_VPE_EIC_SS(irq), set);
98b67c37
SH		 223}
224
39b8d525
RB		 225void gic_send_ipi(unsigned int intr)
226{
53a7bc81 227 gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_SET(intr));
39b8d525
RB		 228}
229
e9de688d
AB		 230int gic_get_c0_compare_int(void)
231{
232 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER))
233 return MIPS_CPU_IRQ_BASE + cp0_compare_irq;
234 return irq_create_mapping(gic_irq_domain,
235 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_TIMER));
236}
237
238int gic_get_c0_perfcount_int(void)
239{
240 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_PERFCTR)) {
7e3e6cb2 241 /* Is the performance counter shared with the timer? */
e9de688d
AB		 242 if (cp0_perfcount_irq < 0)
243 return -1;
244 return MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
245 }
246 return irq_create_mapping(gic_irq_domain,
247 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_PERFCTR));
248}
249
6429e2b6
JH		 250int gic_get_c0_fdc_int(void)
251{
252 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_FDC)) {
253 /* Is the FDC IRQ even present? */
254 if (cp0_fdc_irq < 0)
255 return -1;
256 return MIPS_CPU_IRQ_BASE + cp0_fdc_irq;
257 }
258
259 /*
260 * Some cores claim the FDC is routable but it doesn't actually seem to
261 * be connected.
262 */
263 switch (current_cpu_type()) {
264 case CPU_INTERAPTIV:
265 case CPU_PROAPTIV:
266 return -1;
267 }
268
269 return irq_create_mapping(gic_irq_domain,
270 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_FDC));
271}
272
1b3ed367 273static void gic_handle_shared_int(bool chained)
39b8d525 274{
d7eb4f2e 275 unsigned int i, intr, virq;
8f5ee79c 276 unsigned long *pcpu_mask;
5f68fea0 277 unsigned long pending_reg, intrmask_reg;
8f5ee79c
AB		 278 DECLARE_BITMAP(pending, GIC_MAX_INTRS);
279 DECLARE_BITMAP(intrmask, GIC_MAX_INTRS);
39b8d525
RB		 280
281 /* Get per-cpu bitmaps */
39b8d525
RB		 282 pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask;
283
824f3f7f
AB		 284 pending_reg = GIC_REG(SHARED, GIC_SH_PEND);
285 intrmask_reg = GIC_REG(SHARED, GIC_SH_MASK);
39b8d525 286
fbd55241 287 for (i = 0; i < BITS_TO_LONGS(gic_shared_intrs); i++) {
5f68fea0
AB		 288 pending[i] = gic_read(pending_reg);
289 intrmask[i] = gic_read(intrmask_reg);
290 pending_reg += 0x4;
291 intrmask_reg += 0x4;
39b8d525
RB		 292 }
293
fbd55241
AB		 294 bitmap_and(pending, pending, intrmask, gic_shared_intrs);
295 bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs);
39b8d525 296
d7eb4f2e
QY		 297 intr = find_first_bit(pending, gic_shared_intrs);
298 while (intr != gic_shared_intrs) {
299 virq = irq_linear_revmap(gic_irq_domain,
300 GIC_SHARED_TO_HWIRQ(intr));
1b3ed367
RV		 301 if (chained)
302 generic_handle_irq(virq);
303 else
304 do_IRQ(virq);
d7eb4f2e
QY		 305
306 /* go to next pending bit */
307 bitmap_clear(pending, intr, 1);
308 intr = find_first_bit(pending, gic_shared_intrs);
309 }
39b8d525
RB		 310}
311
161d049e 312static void gic_mask_irq(struct irq_data *d)
39b8d525 313{
5f68fea0 314 gic_reset_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
39b8d525
RB		 315}
316
161d049e 317static void gic_unmask_irq(struct irq_data *d)
39b8d525 318{
5f68fea0 319 gic_set_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
39b8d525
RB		 320}
321
5561c9e4
AB		 322static void gic_ack_irq(struct irq_data *d)
323{
e9de688d 324 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
c49581a4 325
53a7bc81 326 gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_CLR(irq));
5561c9e4
AB		 327}
328
95150ae8
AB		 329static int gic_set_type(struct irq_data *d, unsigned int type)
330{
e9de688d 331 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
95150ae8
AB		 332 unsigned long flags;
333 bool is_edge;
334
335 spin_lock_irqsave(&gic_lock, flags);
336 switch (type & IRQ_TYPE_SENSE_MASK) {
337 case IRQ_TYPE_EDGE_FALLING:
5f68fea0
AB		 338 gic_set_polarity(irq, GIC_POL_NEG);
339 gic_set_trigger(irq, GIC_TRIG_EDGE);
340 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
95150ae8
AB		 341 is_edge = true;
342 break;
343 case IRQ_TYPE_EDGE_RISING:
5f68fea0
AB		 344 gic_set_polarity(irq, GIC_POL_POS);
345 gic_set_trigger(irq, GIC_TRIG_EDGE);
346 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
95150ae8
AB		 347 is_edge = true;
348 break;
349 case IRQ_TYPE_EDGE_BOTH:
350 /* polarity is irrelevant in this case */
5f68fea0
AB		 351 gic_set_trigger(irq, GIC_TRIG_EDGE);
352 gic_set_dual_edge(irq, GIC_TRIG_DUAL_ENABLE);
95150ae8
AB		 353 is_edge = true;
354 break;
355 case IRQ_TYPE_LEVEL_LOW:
5f68fea0
AB		 356 gic_set_polarity(irq, GIC_POL_NEG);
357 gic_set_trigger(irq, GIC_TRIG_LEVEL);
358 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
95150ae8
AB		 359 is_edge = false;
360 break;
361 case IRQ_TYPE_LEVEL_HIGH:
362 default:
5f68fea0
AB		 363 gic_set_polarity(irq, GIC_POL_POS);
364 gic_set_trigger(irq, GIC_TRIG_LEVEL);
365 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
95150ae8
AB		 366 is_edge = false;
367 break;
368 }
369
370 if (is_edge) {
4a6a3ea3
AB		 371 __irq_set_chip_handler_name_locked(d->irq,
372 &gic_edge_irq_controller,
373 handle_edge_irq, NULL);
95150ae8 374 } else {
4a6a3ea3
AB		 375 __irq_set_chip_handler_name_locked(d->irq,
376 &gic_level_irq_controller,
377 handle_level_irq, NULL);
95150ae8
AB		 378 }
379 spin_unlock_irqrestore(&gic_lock, flags);
39b8d525 380
95150ae8
AB		 381 return 0;
382}
383
384#ifdef CONFIG_SMP
161d049e
TG		 385static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
386 bool force)
39b8d525 387{
e9de688d 388 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
39b8d525
RB		 389 cpumask_t tmp = CPU_MASK_NONE;
390 unsigned long flags;
391 int i;
392
0de26520 393 cpumask_and(&tmp, cpumask, cpu_online_mask);
f9b531fe 394 if (cpumask_empty(&tmp))
14d160ab 395 return -EINVAL;
39b8d525
RB		 396
397 /* Assumption : cpumask refers to a single CPU */
398 spin_lock_irqsave(&gic_lock, flags);
39b8d525 399
c214c035 400 /* Re-route this IRQ */
f9b531fe 401 gic_map_to_vpe(irq, cpumask_first(&tmp));
c214c035
TW		 402
403 /* Update the pcpu_masks */
404 for (i = 0; i < NR_CPUS; i++)
405 clear_bit(irq, pcpu_masks[i].pcpu_mask);
f9b531fe 406 set_bit(irq, pcpu_masks[cpumask_first(&tmp)].pcpu_mask);
39b8d525 407
161d049e 408 cpumask_copy(d->affinity, cpumask);
39b8d525
RB		 409 spin_unlock_irqrestore(&gic_lock, flags);
410
161d049e 411 return IRQ_SET_MASK_OK_NOCOPY;
39b8d525
RB		 412}
413#endif
414
4a6a3ea3
AB		 415static struct irq_chip gic_level_irq_controller = {
416 .name = "MIPS GIC",
417 .irq_mask = gic_mask_irq,
418 .irq_unmask = gic_unmask_irq,
419 .irq_set_type = gic_set_type,
420#ifdef CONFIG_SMP
421 .irq_set_affinity = gic_set_affinity,
422#endif
423};
424
425static struct irq_chip gic_edge_irq_controller = {
161d049e 426 .name = "MIPS GIC",
5561c9e4 427 .irq_ack = gic_ack_irq,
161d049e 428 .irq_mask = gic_mask_irq,
161d049e 429 .irq_unmask = gic_unmask_irq,
95150ae8 430 .irq_set_type = gic_set_type,
39b8d525 431#ifdef CONFIG_SMP
161d049e 432 .irq_set_affinity = gic_set_affinity,
39b8d525
RB		 433#endif
434};
435
1b3ed367 436static void gic_handle_local_int(bool chained)
e9de688d
AB		 437{
438 unsigned long pending, masked;
d7eb4f2e 439 unsigned int intr, virq;
e9de688d 440
5f68fea0
AB		 441 pending = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_PEND));
442 masked = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_MASK));
e9de688d
AB		 443
444 bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS);
445
d7eb4f2e
QY		 446 intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS);
447 while (intr != GIC_NUM_LOCAL_INTRS) {
448 virq = irq_linear_revmap(gic_irq_domain,
449 GIC_LOCAL_TO_HWIRQ(intr));
1b3ed367
RV		 450 if (chained)
451 generic_handle_irq(virq);
452 else
453 do_IRQ(virq);
d7eb4f2e
QY		 454
455 /* go to next pending bit */
456 bitmap_clear(&pending, intr, 1);
457 intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS);
458 }
e9de688d
AB		 459}
460
461static void gic_mask_local_irq(struct irq_data *d)
462{
463 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
464
5f68fea0 465 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_RMASK), 1 << intr);
e9de688d
AB		 466}
467
468static void gic_unmask_local_irq(struct irq_data *d)
469{
470 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
471
5f68fea0 472 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), 1 << intr);
e9de688d
AB		 473}
474
475static struct irq_chip gic_local_irq_controller = {
476 .name = "MIPS GIC Local",
477 .irq_mask = gic_mask_local_irq,
478 .irq_unmask = gic_unmask_local_irq,
479};
480
481static void gic_mask_local_irq_all_vpes(struct irq_data *d)
482{
483 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
484 int i;
485 unsigned long flags;
486
487 spin_lock_irqsave(&gic_lock, flags);
488 for (i = 0; i < gic_vpes; i++) {
5f68fea0
AB		 489 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
490 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << intr);
e9de688d
AB		 491 }
492 spin_unlock_irqrestore(&gic_lock, flags);
493}
494
495static void gic_unmask_local_irq_all_vpes(struct irq_data *d)
496{
497 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
498 int i;
499 unsigned long flags;
500
501 spin_lock_irqsave(&gic_lock, flags);
502 for (i = 0; i < gic_vpes; i++) {
5f68fea0
AB		 503 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
504 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SMASK), 1 << intr);
e9de688d
AB		 505 }
506 spin_unlock_irqrestore(&gic_lock, flags);
507}
508
509static struct irq_chip gic_all_vpes_local_irq_controller = {
510 .name = "MIPS GIC Local",
511 .irq_mask = gic_mask_local_irq_all_vpes,
512 .irq_unmask = gic_unmask_local_irq_all_vpes,
513};
514
18743d27 515static void __gic_irq_dispatch(void)
39b8d525 516{
1b3ed367
RV		 517 gic_handle_local_int(false);
518 gic_handle_shared_int(false);
18743d27 519}
39b8d525 520
18743d27
AB		 521static void gic_irq_dispatch(unsigned int irq, struct irq_desc *desc)
522{
1b3ed367
RV		 523 gic_handle_local_int(true);
524 gic_handle_shared_int(true);
18743d27
AB		 525}
526
527#ifdef CONFIG_MIPS_GIC_IPI
528static int gic_resched_int_base;
529static int gic_call_int_base;
530
531unsigned int plat_ipi_resched_int_xlate(unsigned int cpu)
532{
533 return gic_resched_int_base + cpu;
534}
39b8d525 535
18743d27
AB		 536unsigned int plat_ipi_call_int_xlate(unsigned int cpu)
537{
538 return gic_call_int_base + cpu;
539}
39b8d525 540
18743d27
AB		 541static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
542{
543 scheduler_ipi();
544
545 return IRQ_HANDLED;
546}
547
548static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
549{
550 smp_call_function_interrupt();
551
552 return IRQ_HANDLED;
553}
b0a88ae5 554
18743d27
AB		 555static struct irqaction irq_resched = {
556 .handler = ipi_resched_interrupt,
557 .flags = IRQF_PERCPU,
558 .name = "IPI resched"
559};
560
561static struct irqaction irq_call = {
562 .handler = ipi_call_interrupt,
563 .flags = IRQF_PERCPU,
564 .name = "IPI call"
565};
566
567static __init void gic_ipi_init_one(unsigned int intr, int cpu,
568 struct irqaction *action)
569{
e9de688d
AB		 570 int virq = irq_create_mapping(gic_irq_domain,
571 GIC_SHARED_TO_HWIRQ(intr));
18743d27
AB		 572 int i;
573
5f68fea0 574 gic_map_to_vpe(intr, cpu);
c49581a4
AB		 575 for (i = 0; i < NR_CPUS; i++)
576 clear_bit(intr, pcpu_masks[i].pcpu_mask);
b0a88ae5
JD		 577 set_bit(intr, pcpu_masks[cpu].pcpu_mask);
578
18743d27
AB		 579 irq_set_irq_type(virq, IRQ_TYPE_EDGE_RISING);
580
581 irq_set_handler(virq, handle_percpu_irq);
582 setup_irq(virq, action);
39b8d525
RB		 583}
584
18743d27 585static __init void gic_ipi_init(void)
39b8d525 586{
18743d27
AB		 587 int i;
588
589 /* Use last 2 * NR_CPUS interrupts as IPIs */
fbd55241 590 gic_resched_int_base = gic_shared_intrs - nr_cpu_ids;
18743d27
AB		 591 gic_call_int_base = gic_resched_int_base - nr_cpu_ids;
592
593 for (i = 0; i < nr_cpu_ids; i++) {
594 gic_ipi_init_one(gic_call_int_base + i, i, &irq_call);
595 gic_ipi_init_one(gic_resched_int_base + i, i, &irq_resched);
596 }
597}
598#else
599static inline void gic_ipi_init(void)
600{
601}
602#endif
603
e9de688d 604static void __init gic_basic_init(void)
18743d27
AB		 605{
606 unsigned int i;
98b67c37
SH		 607
608 board_bind_eic_interrupt = &gic_bind_eic_interrupt;
39b8d525
RB		 609
610 /* Setup defaults */
fbd55241 611 for (i = 0; i < gic_shared_intrs; i++) {
5f68fea0
AB		 612 gic_set_polarity(i, GIC_POL_POS);
613 gic_set_trigger(i, GIC_TRIG_LEVEL);
614 gic_reset_mask(i);
39b8d525
RB		 615 }
616
e9de688d
AB		 617 for (i = 0; i < gic_vpes; i++) {
618 unsigned int j;
619
5f68fea0 620 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
e9de688d
AB		 621 for (j = 0; j < GIC_NUM_LOCAL_INTRS; j++) {
622 if (!gic_local_irq_is_routable(j))
623 continue;
5f68fea0 624 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << j);
e9de688d
AB		 625 }
626 }
39b8d525
RB		 627}
628
e9de688d
AB		 629static int gic_local_irq_domain_map(struct irq_domain *d, unsigned int virq,
630 irq_hw_number_t hw)
c49581a4 631{
e9de688d
AB		 632 int intr = GIC_HWIRQ_TO_LOCAL(hw);
633 int ret = 0;
634 int i;
635 unsigned long flags;
636
637 if (!gic_local_irq_is_routable(intr))
638 return -EPERM;
639
640 /*
641 * HACK: These are all really percpu interrupts, but the rest
642 * of the MIPS kernel code does not use the percpu IRQ API for
643 * the CP0 timer and performance counter interrupts.
644 */
b720fd8b
JH		 645 switch (intr) {
646 case GIC_LOCAL_INT_TIMER:
647 case GIC_LOCAL_INT_PERFCTR:
648 case GIC_LOCAL_INT_FDC:
649 irq_set_chip_and_handler(virq,
650 &gic_all_vpes_local_irq_controller,
651 handle_percpu_irq);
652 break;
653 default:
e9de688d
AB		 654 irq_set_chip_and_handler(virq,
655 &gic_local_irq_controller,
656 handle_percpu_devid_irq);
657 irq_set_percpu_devid(virq);
b720fd8b 658 break;
e9de688d
AB		 659 }
660
661 spin_lock_irqsave(&gic_lock, flags);
662 for (i = 0; i < gic_vpes; i++) {
663 u32 val = GIC_MAP_TO_PIN_MSK | gic_cpu_pin;
664
5f68fea0 665 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
e9de688d
AB		 666
667 switch (intr) {
668 case GIC_LOCAL_INT_WD:
5f68fea0 669 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_WD_MAP), val);
e9de688d
AB		 670 break;
671 case GIC_LOCAL_INT_COMPARE:
5f68fea0 672 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_MAP), val);
e9de688d
AB		 673 break;
674 case GIC_LOCAL_INT_TIMER:
1b6af71a
JH		 675 /* CONFIG_MIPS_CMP workaround (see __gic_init) */
676 val = GIC_MAP_TO_PIN_MSK | timer_cpu_pin;
5f68fea0 677 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP), val);
e9de688d
AB		 678 break;
679 case GIC_LOCAL_INT_PERFCTR:
5f68fea0 680 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP), val);
e9de688d
AB		 681 break;
682 case GIC_LOCAL_INT_SWINT0:
5f68fea0 683 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT0_MAP), val);
e9de688d
AB		 684 break;
685 case GIC_LOCAL_INT_SWINT1:
5f68fea0 686 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT1_MAP), val);
e9de688d
AB		 687 break;
688 case GIC_LOCAL_INT_FDC:
5f68fea0 689 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_FDC_MAP), val);
e9de688d
AB		 690 break;
691 default:
692 pr_err("Invalid local IRQ %d\n", intr);
693 ret = -EINVAL;
694 break;
695 }
696 }
697 spin_unlock_irqrestore(&gic_lock, flags);
698
699 return ret;
700}
701
702static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq,
703 irq_hw_number_t hw)
704{
705 int intr = GIC_HWIRQ_TO_SHARED(hw);
c49581a4
AB		 706 unsigned long flags;
707
4a6a3ea3
AB		 708 irq_set_chip_and_handler(virq, &gic_level_irq_controller,
709 handle_level_irq);
c49581a4
AB		 710
711 spin_lock_irqsave(&gic_lock, flags);
5f68fea0 712 gic_map_to_pin(intr, gic_cpu_pin);
c49581a4 713 /* Map to VPE 0 by default */
5f68fea0 714 gic_map_to_vpe(intr, 0);
e9de688d 715 set_bit(intr, pcpu_masks[0].pcpu_mask);
c49581a4
AB		 716 spin_unlock_irqrestore(&gic_lock, flags);
717
718 return 0;
719}
720
e9de688d
AB		 721static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
722 irq_hw_number_t hw)
723{
724 if (GIC_HWIRQ_TO_LOCAL(hw) < GIC_NUM_LOCAL_INTRS)
725 return gic_local_irq_domain_map(d, virq, hw);
726 return gic_shared_irq_domain_map(d, virq, hw);
727}
728
a7057270
AB		 729static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
730 const u32 *intspec, unsigned int intsize,
731 irq_hw_number_t *out_hwirq,
732 unsigned int *out_type)
733{
734 if (intsize != 3)
735 return -EINVAL;
736
737 if (intspec[0] == GIC_SHARED)
738 *out_hwirq = GIC_SHARED_TO_HWIRQ(intspec[1]);
739 else if (intspec[0] == GIC_LOCAL)
740 *out_hwirq = GIC_LOCAL_TO_HWIRQ(intspec[1]);
741 else
742 return -EINVAL;
743 *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
744
745 return 0;
746}
747
96009736 748static const struct irq_domain_ops gic_irq_domain_ops = {
c49581a4 749 .map = gic_irq_domain_map,
a7057270 750 .xlate = gic_irq_domain_xlate,
c49581a4
AB		 751};
752
a7057270
AB		 753static void __init __gic_init(unsigned long gic_base_addr,
754 unsigned long gic_addrspace_size,
755 unsigned int cpu_vec, unsigned int irqbase,
756 struct device_node *node)
39b8d525
RB		 757{
758 unsigned int gicconfig;
759
5f68fea0 760 gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size);
39b8d525 761
5f68fea0 762 gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
fbd55241 763 gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
39b8d525 764 GIC_SH_CONFIG_NUMINTRS_SHF;
fbd55241 765 gic_shared_intrs = ((gic_shared_intrs + 1) * 8);
39b8d525 766
e9de688d 767 gic_vpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
39b8d525 768 GIC_SH_CONFIG_NUMVPES_SHF;
e9de688d 769 gic_vpes = gic_vpes + 1;
39b8d525 770
18743d27
AB		 771 if (cpu_has_veic) {
772 /* Always use vector 1 in EIC mode */
773 gic_cpu_pin = 0;
1b6af71a 774 timer_cpu_pin = gic_cpu_pin;
18743d27
AB		 775 set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET,
776 __gic_irq_dispatch);
777 } else {
778 gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET;
779 irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec,
780 gic_irq_dispatch);
1b6af71a
JH		 781 /*
782 * With the CMP implementation of SMP (deprecated), other CPUs
783 * are started by the bootloader and put into a timer based
784 * waiting poll loop. We must not re-route those CPU's local
785 * timer interrupts as the wait instruction will never finish,
786 * so just handle whatever CPU interrupt it is routed to by
787 * default.
788 *
789 * This workaround should be removed when CMP support is
790 * dropped.
791 */
792 if (IS_ENABLED(CONFIG_MIPS_CMP) &&
793 gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) {
794 timer_cpu_pin = gic_read(GIC_REG(VPE_LOCAL,
795 GIC_VPE_TIMER_MAP)) &
796 GIC_MAP_MSK;
797 irq_set_chained_handler(MIPS_CPU_IRQ_BASE +
798 GIC_CPU_PIN_OFFSET +
799 timer_cpu_pin,
800 gic_irq_dispatch);
801 } else {
802 timer_cpu_pin = gic_cpu_pin;
803 }
18743d27
AB		 804 }
805
a7057270 806 gic_irq_domain = irq_domain_add_simple(node, GIC_NUM_LOCAL_INTRS +
e9de688d 807 gic_shared_intrs, irqbase,
c49581a4
AB		 808 &gic_irq_domain_ops, NULL);
809 if (!gic_irq_domain)
810 panic("Failed to add GIC IRQ domain");
0b271f56 811
e9de688d 812 gic_basic_init();
18743d27
AB		 813
814 gic_ipi_init();
39b8d525 815}
a7057270
AB		 816
817void __init gic_init(unsigned long gic_base_addr,
818 unsigned long gic_addrspace_size,
819 unsigned int cpu_vec, unsigned int irqbase)
820{
821 __gic_init(gic_base_addr, gic_addrspace_size, cpu_vec, irqbase, NULL);
822}
823
824static int __init gic_of_init(struct device_node *node,
825 struct device_node *parent)
826{
827 struct resource res;
828 unsigned int cpu_vec, i = 0, reserved = 0;
829 phys_addr_t gic_base;
830 size_t gic_len;
831
832 /* Find the first available CPU vector. */
833 while (!of_property_read_u32_index(node, "mti,reserved-cpu-vectors",
834 i++, &cpu_vec))
835 reserved |= BIT(cpu_vec);
836 for (cpu_vec = 2; cpu_vec < 8; cpu_vec++) {
837 if (!(reserved & BIT(cpu_vec)))
838 break;
839 }
840 if (cpu_vec == 8) {
841 pr_err("No CPU vectors available for GIC\n");
842 return -ENODEV;
843 }
844
845 if (of_address_to_resource(node, 0, &res)) {
846 /*
847 * Probe the CM for the GIC base address if not specified
848 * in the device-tree.
849 */
850 if (mips_cm_present()) {
851 gic_base = read_gcr_gic_base() &
852 ~CM_GCR_GIC_BASE_GICEN_MSK;
853 gic_len = 0x20000;
854 } else {
855 pr_err("Failed to get GIC memory range\n");
856 return -ENODEV;
857 }
858 } else {
859 gic_base = res.start;
860 gic_len = resource_size(&res);
861 }
862
863 if (mips_cm_present())
864 write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN_MSK);
865 gic_present = true;
866
867 __gic_init(gic_base, gic_len, cpu_vec, 0, node);
868
869 return 0;
870}
871IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init);
Linux 6.x block layer and io_uring tree(s)