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Commit | Line | Data |
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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> |
4060bbe9 | 14 | #include <linux/irqchip/mips-gic.h> |
a7057270 | 15 | #include <linux/of_address.h> |
18743d27 | 16 | #include <linux/sched.h> |
631330f5 | 17 | #include <linux/smp.h> |
39b8d525 | 18 | |
a7057270 | 19 | #include <asm/mips-cm.h> |
98b67c37 SH |
20 | #include <asm/setup.h> |
21 | #include <asm/traps.h> | |
39b8d525 | 22 | |
a7057270 AB |
23 | #include <dt-bindings/interrupt-controller/mips-gic.h> |
24 | ||
25 | #include "irqchip.h" | |
26 | ||
ff86714f | 27 | unsigned int gic_present; |
98b67c37 | 28 | |
822350bc | 29 | struct gic_pcpu_mask { |
fbd55241 | 30 | DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS); |
822350bc JD |
31 | }; |
32 | ||
5f68fea0 | 33 | static void __iomem *gic_base; |
0b271f56 | 34 | static struct gic_pcpu_mask pcpu_masks[NR_CPUS]; |
95150ae8 | 35 | static DEFINE_SPINLOCK(gic_lock); |
c49581a4 | 36 | static struct irq_domain *gic_irq_domain; |
fbd55241 | 37 | static int gic_shared_intrs; |
e9de688d | 38 | static int gic_vpes; |
3263d085 | 39 | static unsigned int gic_cpu_pin; |
1b6af71a | 40 | static unsigned int timer_cpu_pin; |
4a6a3ea3 | 41 | static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller; |
39b8d525 | 42 | |
18743d27 AB |
43 | static void __gic_irq_dispatch(void); |
44 | ||
5f68fea0 AB |
45 | static inline unsigned int gic_read(unsigned int reg) |
46 | { | |
47 | return __raw_readl(gic_base + reg); | |
48 | } | |
49 | ||
50 | static inline void gic_write(unsigned int reg, unsigned int val) | |
51 | { | |
52 | __raw_writel(val, gic_base + reg); | |
53 | } | |
54 | ||
55 | static inline void gic_update_bits(unsigned int reg, unsigned int mask, | |
56 | unsigned int val) | |
57 | { | |
58 | unsigned int regval; | |
59 | ||
60 | regval = gic_read(reg); | |
61 | regval &= ~mask; | |
62 | regval |= val; | |
63 | gic_write(reg, regval); | |
64 | } | |
65 | ||
66 | static inline void gic_reset_mask(unsigned int intr) | |
67 | { | |
68 | gic_write(GIC_REG(SHARED, GIC_SH_RMASK) + GIC_INTR_OFS(intr), | |
69 | 1 << GIC_INTR_BIT(intr)); | |
70 | } | |
71 | ||
72 | static inline void gic_set_mask(unsigned int intr) | |
73 | { | |
74 | gic_write(GIC_REG(SHARED, GIC_SH_SMASK) + GIC_INTR_OFS(intr), | |
75 | 1 << GIC_INTR_BIT(intr)); | |
76 | } | |
77 | ||
78 | static inline void gic_set_polarity(unsigned int intr, unsigned int pol) | |
79 | { | |
80 | gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_POLARITY) + | |
81 | GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr), | |
82 | pol << GIC_INTR_BIT(intr)); | |
83 | } | |
84 | ||
85 | static inline void gic_set_trigger(unsigned int intr, unsigned int trig) | |
86 | { | |
87 | gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_TRIGGER) + | |
88 | GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr), | |
89 | trig << GIC_INTR_BIT(intr)); | |
90 | } | |
91 | ||
92 | static inline void gic_set_dual_edge(unsigned int intr, unsigned int dual) | |
93 | { | |
94 | gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_DUAL) + GIC_INTR_OFS(intr), | |
95 | 1 << GIC_INTR_BIT(intr), | |
96 | dual << GIC_INTR_BIT(intr)); | |
97 | } | |
98 | ||
99 | static inline void gic_map_to_pin(unsigned int intr, unsigned int pin) | |
100 | { | |
101 | gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_PIN_BASE) + | |
102 | GIC_SH_MAP_TO_PIN(intr), GIC_MAP_TO_PIN_MSK | pin); | |
103 | } | |
104 | ||
105 | static inline void gic_map_to_vpe(unsigned int intr, unsigned int vpe) | |
106 | { | |
107 | gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_VPE_BASE) + | |
108 | GIC_SH_MAP_TO_VPE_REG_OFF(intr, vpe), | |
109 | GIC_SH_MAP_TO_VPE_REG_BIT(vpe)); | |
110 | } | |
111 | ||
a331ce63 | 112 | #ifdef CONFIG_CLKSRC_MIPS_GIC |
dfa762e1 SH |
113 | cycle_t gic_read_count(void) |
114 | { | |
115 | unsigned int hi, hi2, lo; | |
116 | ||
117 | do { | |
5f68fea0 AB |
118 | hi = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32)); |
119 | lo = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_31_00)); | |
120 | hi2 = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32)); | |
dfa762e1 SH |
121 | } while (hi2 != hi); |
122 | ||
123 | return (((cycle_t) hi) << 32) + lo; | |
124 | } | |
0ab2b7d0 | 125 | |
387904ff AB |
126 | unsigned int gic_get_count_width(void) |
127 | { | |
128 | unsigned int bits, config; | |
129 | ||
5f68fea0 | 130 | config = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); |
387904ff AB |
131 | bits = 32 + 4 * ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >> |
132 | GIC_SH_CONFIG_COUNTBITS_SHF); | |
133 | ||
134 | return bits; | |
135 | } | |
136 | ||
0ab2b7d0 RG |
137 | void gic_write_compare(cycle_t cnt) |
138 | { | |
5f68fea0 | 139 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI), |
0ab2b7d0 | 140 | (int)(cnt >> 32)); |
5f68fea0 | 141 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO), |
0ab2b7d0 RG |
142 | (int)(cnt & 0xffffffff)); |
143 | } | |
144 | ||
414408d0 PB |
145 | void gic_write_cpu_compare(cycle_t cnt, int cpu) |
146 | { | |
147 | unsigned long flags; | |
148 | ||
149 | local_irq_save(flags); | |
150 | ||
5f68fea0 AB |
151 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), cpu); |
152 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_HI), | |
414408d0 | 153 | (int)(cnt >> 32)); |
5f68fea0 | 154 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_LO), |
414408d0 PB |
155 | (int)(cnt & 0xffffffff)); |
156 | ||
157 | local_irq_restore(flags); | |
158 | } | |
159 | ||
0ab2b7d0 RG |
160 | cycle_t gic_read_compare(void) |
161 | { | |
162 | unsigned int hi, lo; | |
163 | ||
5f68fea0 AB |
164 | hi = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI)); |
165 | lo = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO)); | |
0ab2b7d0 RG |
166 | |
167 | return (((cycle_t) hi) << 32) + lo; | |
168 | } | |
8fa4b930 MC |
169 | |
170 | void gic_start_count(void) | |
171 | { | |
172 | u32 gicconfig; | |
173 | ||
174 | /* Start the counter */ | |
175 | gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); | |
176 | gicconfig &= ~(1 << GIC_SH_CONFIG_COUNTSTOP_SHF); | |
177 | gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig); | |
178 | } | |
179 | ||
180 | void gic_stop_count(void) | |
181 | { | |
182 | u32 gicconfig; | |
183 | ||
184 | /* Stop the counter */ | |
185 | gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); | |
186 | gicconfig |= 1 << GIC_SH_CONFIG_COUNTSTOP_SHF; | |
187 | gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig); | |
188 | } | |
189 | ||
dfa762e1 SH |
190 | #endif |
191 | ||
e9de688d AB |
192 | static bool gic_local_irq_is_routable(int intr) |
193 | { | |
194 | u32 vpe_ctl; | |
195 | ||
196 | /* All local interrupts are routable in EIC mode. */ | |
197 | if (cpu_has_veic) | |
198 | return true; | |
199 | ||
5f68fea0 | 200 | vpe_ctl = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_CTL)); |
e9de688d AB |
201 | switch (intr) { |
202 | case GIC_LOCAL_INT_TIMER: | |
203 | return vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK; | |
204 | case GIC_LOCAL_INT_PERFCTR: | |
205 | return vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK; | |
206 | case GIC_LOCAL_INT_FDC: | |
207 | return vpe_ctl & GIC_VPE_CTL_FDC_RTBL_MSK; | |
208 | case GIC_LOCAL_INT_SWINT0: | |
209 | case GIC_LOCAL_INT_SWINT1: | |
210 | return vpe_ctl & GIC_VPE_CTL_SWINT_RTBL_MSK; | |
211 | default: | |
212 | return true; | |
213 | } | |
214 | } | |
215 | ||
3263d085 | 216 | static void gic_bind_eic_interrupt(int irq, int set) |
98b67c37 SH |
217 | { |
218 | /* Convert irq vector # to hw int # */ | |
219 | irq -= GIC_PIN_TO_VEC_OFFSET; | |
220 | ||
221 | /* Set irq to use shadow set */ | |
5f68fea0 AB |
222 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_EIC_SHADOW_SET_BASE) + |
223 | GIC_VPE_EIC_SS(irq), set); | |
98b67c37 SH |
224 | } |
225 | ||
39b8d525 RB |
226 | void gic_send_ipi(unsigned int intr) |
227 | { | |
53a7bc81 | 228 | gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_SET(intr)); |
39b8d525 RB |
229 | } |
230 | ||
e9de688d AB |
231 | int gic_get_c0_compare_int(void) |
232 | { | |
233 | if (!gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) | |
234 | return MIPS_CPU_IRQ_BASE + cp0_compare_irq; | |
235 | return irq_create_mapping(gic_irq_domain, | |
236 | GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_TIMER)); | |
237 | } | |
238 | ||
239 | int gic_get_c0_perfcount_int(void) | |
240 | { | |
241 | if (!gic_local_irq_is_routable(GIC_LOCAL_INT_PERFCTR)) { | |
7e3e6cb2 | 242 | /* Is the performance counter shared with the timer? */ |
e9de688d AB |
243 | if (cp0_perfcount_irq < 0) |
244 | return -1; | |
245 | return MIPS_CPU_IRQ_BASE + cp0_perfcount_irq; | |
246 | } | |
247 | return irq_create_mapping(gic_irq_domain, | |
248 | GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_PERFCTR)); | |
249 | } | |
250 | ||
6429e2b6 JH |
251 | int gic_get_c0_fdc_int(void) |
252 | { | |
253 | if (!gic_local_irq_is_routable(GIC_LOCAL_INT_FDC)) { | |
254 | /* Is the FDC IRQ even present? */ | |
255 | if (cp0_fdc_irq < 0) | |
256 | return -1; | |
257 | return MIPS_CPU_IRQ_BASE + cp0_fdc_irq; | |
258 | } | |
259 | ||
6429e2b6 JH |
260 | return irq_create_mapping(gic_irq_domain, |
261 | GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_FDC)); | |
262 | } | |
263 | ||
1b3ed367 | 264 | static void gic_handle_shared_int(bool chained) |
39b8d525 | 265 | { |
d7eb4f2e | 266 | unsigned int i, intr, virq; |
8f5ee79c | 267 | unsigned long *pcpu_mask; |
5f68fea0 | 268 | unsigned long pending_reg, intrmask_reg; |
8f5ee79c AB |
269 | DECLARE_BITMAP(pending, GIC_MAX_INTRS); |
270 | DECLARE_BITMAP(intrmask, GIC_MAX_INTRS); | |
39b8d525 RB |
271 | |
272 | /* Get per-cpu bitmaps */ | |
39b8d525 RB |
273 | pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask; |
274 | ||
824f3f7f AB |
275 | pending_reg = GIC_REG(SHARED, GIC_SH_PEND); |
276 | intrmask_reg = GIC_REG(SHARED, GIC_SH_MASK); | |
39b8d525 | 277 | |
fbd55241 | 278 | for (i = 0; i < BITS_TO_LONGS(gic_shared_intrs); i++) { |
5f68fea0 AB |
279 | pending[i] = gic_read(pending_reg); |
280 | intrmask[i] = gic_read(intrmask_reg); | |
281 | pending_reg += 0x4; | |
282 | intrmask_reg += 0x4; | |
39b8d525 RB |
283 | } |
284 | ||
fbd55241 AB |
285 | bitmap_and(pending, pending, intrmask, gic_shared_intrs); |
286 | bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs); | |
39b8d525 | 287 | |
d7eb4f2e QY |
288 | intr = find_first_bit(pending, gic_shared_intrs); |
289 | while (intr != gic_shared_intrs) { | |
290 | virq = irq_linear_revmap(gic_irq_domain, | |
291 | GIC_SHARED_TO_HWIRQ(intr)); | |
1b3ed367 RV |
292 | if (chained) |
293 | generic_handle_irq(virq); | |
294 | else | |
295 | do_IRQ(virq); | |
d7eb4f2e QY |
296 | |
297 | /* go to next pending bit */ | |
298 | bitmap_clear(pending, intr, 1); | |
299 | intr = find_first_bit(pending, gic_shared_intrs); | |
300 | } | |
39b8d525 RB |
301 | } |
302 | ||
161d049e | 303 | static void gic_mask_irq(struct irq_data *d) |
39b8d525 | 304 | { |
5f68fea0 | 305 | gic_reset_mask(GIC_HWIRQ_TO_SHARED(d->hwirq)); |
39b8d525 RB |
306 | } |
307 | ||
161d049e | 308 | static void gic_unmask_irq(struct irq_data *d) |
39b8d525 | 309 | { |
5f68fea0 | 310 | gic_set_mask(GIC_HWIRQ_TO_SHARED(d->hwirq)); |
39b8d525 RB |
311 | } |
312 | ||
5561c9e4 AB |
313 | static void gic_ack_irq(struct irq_data *d) |
314 | { | |
e9de688d | 315 | unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); |
c49581a4 | 316 | |
53a7bc81 | 317 | gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_CLR(irq)); |
5561c9e4 AB |
318 | } |
319 | ||
95150ae8 AB |
320 | static int gic_set_type(struct irq_data *d, unsigned int type) |
321 | { | |
e9de688d | 322 | unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); |
95150ae8 AB |
323 | unsigned long flags; |
324 | bool is_edge; | |
325 | ||
326 | spin_lock_irqsave(&gic_lock, flags); | |
327 | switch (type & IRQ_TYPE_SENSE_MASK) { | |
328 | case IRQ_TYPE_EDGE_FALLING: | |
5f68fea0 AB |
329 | gic_set_polarity(irq, GIC_POL_NEG); |
330 | gic_set_trigger(irq, GIC_TRIG_EDGE); | |
331 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); | |
95150ae8 AB |
332 | is_edge = true; |
333 | break; | |
334 | case IRQ_TYPE_EDGE_RISING: | |
5f68fea0 AB |
335 | gic_set_polarity(irq, GIC_POL_POS); |
336 | gic_set_trigger(irq, GIC_TRIG_EDGE); | |
337 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); | |
95150ae8 AB |
338 | is_edge = true; |
339 | break; | |
340 | case IRQ_TYPE_EDGE_BOTH: | |
341 | /* polarity is irrelevant in this case */ | |
5f68fea0 AB |
342 | gic_set_trigger(irq, GIC_TRIG_EDGE); |
343 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_ENABLE); | |
95150ae8 AB |
344 | is_edge = true; |
345 | break; | |
346 | case IRQ_TYPE_LEVEL_LOW: | |
5f68fea0 AB |
347 | gic_set_polarity(irq, GIC_POL_NEG); |
348 | gic_set_trigger(irq, GIC_TRIG_LEVEL); | |
349 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); | |
95150ae8 AB |
350 | is_edge = false; |
351 | break; | |
352 | case IRQ_TYPE_LEVEL_HIGH: | |
353 | default: | |
5f68fea0 AB |
354 | gic_set_polarity(irq, GIC_POL_POS); |
355 | gic_set_trigger(irq, GIC_TRIG_LEVEL); | |
356 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); | |
95150ae8 AB |
357 | is_edge = false; |
358 | break; | |
359 | } | |
360 | ||
361 | if (is_edge) { | |
4a6a3ea3 AB |
362 | __irq_set_chip_handler_name_locked(d->irq, |
363 | &gic_edge_irq_controller, | |
364 | handle_edge_irq, NULL); | |
95150ae8 | 365 | } else { |
4a6a3ea3 AB |
366 | __irq_set_chip_handler_name_locked(d->irq, |
367 | &gic_level_irq_controller, | |
368 | handle_level_irq, NULL); | |
95150ae8 AB |
369 | } |
370 | spin_unlock_irqrestore(&gic_lock, flags); | |
39b8d525 | 371 | |
95150ae8 AB |
372 | return 0; |
373 | } | |
374 | ||
375 | #ifdef CONFIG_SMP | |
161d049e TG |
376 | static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask, |
377 | bool force) | |
39b8d525 | 378 | { |
e9de688d | 379 | unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); |
39b8d525 RB |
380 | cpumask_t tmp = CPU_MASK_NONE; |
381 | unsigned long flags; | |
382 | int i; | |
383 | ||
0de26520 | 384 | cpumask_and(&tmp, cpumask, cpu_online_mask); |
f9b531fe | 385 | if (cpumask_empty(&tmp)) |
14d160ab | 386 | return -EINVAL; |
39b8d525 RB |
387 | |
388 | /* Assumption : cpumask refers to a single CPU */ | |
389 | spin_lock_irqsave(&gic_lock, flags); | |
39b8d525 | 390 | |
c214c035 | 391 | /* Re-route this IRQ */ |
f9b531fe | 392 | gic_map_to_vpe(irq, cpumask_first(&tmp)); |
c214c035 TW |
393 | |
394 | /* Update the pcpu_masks */ | |
395 | for (i = 0; i < NR_CPUS; i++) | |
396 | clear_bit(irq, pcpu_masks[i].pcpu_mask); | |
f9b531fe | 397 | set_bit(irq, pcpu_masks[cpumask_first(&tmp)].pcpu_mask); |
39b8d525 | 398 | |
161d049e | 399 | cpumask_copy(d->affinity, cpumask); |
39b8d525 RB |
400 | spin_unlock_irqrestore(&gic_lock, flags); |
401 | ||
161d049e | 402 | return IRQ_SET_MASK_OK_NOCOPY; |
39b8d525 RB |
403 | } |
404 | #endif | |
405 | ||
4a6a3ea3 AB |
406 | static struct irq_chip gic_level_irq_controller = { |
407 | .name = "MIPS GIC", | |
408 | .irq_mask = gic_mask_irq, | |
409 | .irq_unmask = gic_unmask_irq, | |
410 | .irq_set_type = gic_set_type, | |
411 | #ifdef CONFIG_SMP | |
412 | .irq_set_affinity = gic_set_affinity, | |
413 | #endif | |
414 | }; | |
415 | ||
416 | static struct irq_chip gic_edge_irq_controller = { | |
161d049e | 417 | .name = "MIPS GIC", |
5561c9e4 | 418 | .irq_ack = gic_ack_irq, |
161d049e | 419 | .irq_mask = gic_mask_irq, |
161d049e | 420 | .irq_unmask = gic_unmask_irq, |
95150ae8 | 421 | .irq_set_type = gic_set_type, |
39b8d525 | 422 | #ifdef CONFIG_SMP |
161d049e | 423 | .irq_set_affinity = gic_set_affinity, |
39b8d525 RB |
424 | #endif |
425 | }; | |
426 | ||
1b3ed367 | 427 | static void gic_handle_local_int(bool chained) |
e9de688d AB |
428 | { |
429 | unsigned long pending, masked; | |
d7eb4f2e | 430 | unsigned int intr, virq; |
e9de688d | 431 | |
5f68fea0 AB |
432 | pending = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_PEND)); |
433 | masked = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_MASK)); | |
e9de688d AB |
434 | |
435 | bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS); | |
436 | ||
d7eb4f2e QY |
437 | intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS); |
438 | while (intr != GIC_NUM_LOCAL_INTRS) { | |
439 | virq = irq_linear_revmap(gic_irq_domain, | |
440 | GIC_LOCAL_TO_HWIRQ(intr)); | |
1b3ed367 RV |
441 | if (chained) |
442 | generic_handle_irq(virq); | |
443 | else | |
444 | do_IRQ(virq); | |
d7eb4f2e QY |
445 | |
446 | /* go to next pending bit */ | |
447 | bitmap_clear(&pending, intr, 1); | |
448 | intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS); | |
449 | } | |
e9de688d AB |
450 | } |
451 | ||
452 | static void gic_mask_local_irq(struct irq_data *d) | |
453 | { | |
454 | int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); | |
455 | ||
5f68fea0 | 456 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_RMASK), 1 << intr); |
e9de688d AB |
457 | } |
458 | ||
459 | static void gic_unmask_local_irq(struct irq_data *d) | |
460 | { | |
461 | int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); | |
462 | ||
5f68fea0 | 463 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), 1 << intr); |
e9de688d AB |
464 | } |
465 | ||
466 | static struct irq_chip gic_local_irq_controller = { | |
467 | .name = "MIPS GIC Local", | |
468 | .irq_mask = gic_mask_local_irq, | |
469 | .irq_unmask = gic_unmask_local_irq, | |
470 | }; | |
471 | ||
472 | static void gic_mask_local_irq_all_vpes(struct irq_data *d) | |
473 | { | |
474 | int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); | |
475 | int i; | |
476 | unsigned long flags; | |
477 | ||
478 | spin_lock_irqsave(&gic_lock, flags); | |
479 | for (i = 0; i < gic_vpes; i++) { | |
5f68fea0 AB |
480 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); |
481 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << intr); | |
e9de688d AB |
482 | } |
483 | spin_unlock_irqrestore(&gic_lock, flags); | |
484 | } | |
485 | ||
486 | static void gic_unmask_local_irq_all_vpes(struct irq_data *d) | |
487 | { | |
488 | int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); | |
489 | int i; | |
490 | unsigned long flags; | |
491 | ||
492 | spin_lock_irqsave(&gic_lock, flags); | |
493 | for (i = 0; i < gic_vpes; i++) { | |
5f68fea0 AB |
494 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); |
495 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SMASK), 1 << intr); | |
e9de688d AB |
496 | } |
497 | spin_unlock_irqrestore(&gic_lock, flags); | |
498 | } | |
499 | ||
500 | static struct irq_chip gic_all_vpes_local_irq_controller = { | |
501 | .name = "MIPS GIC Local", | |
502 | .irq_mask = gic_mask_local_irq_all_vpes, | |
503 | .irq_unmask = gic_unmask_local_irq_all_vpes, | |
504 | }; | |
505 | ||
18743d27 | 506 | static void __gic_irq_dispatch(void) |
39b8d525 | 507 | { |
1b3ed367 RV |
508 | gic_handle_local_int(false); |
509 | gic_handle_shared_int(false); | |
18743d27 | 510 | } |
39b8d525 | 511 | |
18743d27 AB |
512 | static void gic_irq_dispatch(unsigned int irq, struct irq_desc *desc) |
513 | { | |
1b3ed367 RV |
514 | gic_handle_local_int(true); |
515 | gic_handle_shared_int(true); | |
18743d27 AB |
516 | } |
517 | ||
518 | #ifdef CONFIG_MIPS_GIC_IPI | |
519 | static int gic_resched_int_base; | |
520 | static int gic_call_int_base; | |
521 | ||
522 | unsigned int plat_ipi_resched_int_xlate(unsigned int cpu) | |
523 | { | |
524 | return gic_resched_int_base + cpu; | |
525 | } | |
39b8d525 | 526 | |
18743d27 AB |
527 | unsigned int plat_ipi_call_int_xlate(unsigned int cpu) |
528 | { | |
529 | return gic_call_int_base + cpu; | |
530 | } | |
39b8d525 | 531 | |
18743d27 AB |
532 | static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id) |
533 | { | |
534 | scheduler_ipi(); | |
535 | ||
536 | return IRQ_HANDLED; | |
537 | } | |
538 | ||
539 | static irqreturn_t ipi_call_interrupt(int irq, void *dev_id) | |
540 | { | |
4ace6139 | 541 | generic_smp_call_function_interrupt(); |
18743d27 AB |
542 | |
543 | return IRQ_HANDLED; | |
544 | } | |
b0a88ae5 | 545 | |
18743d27 AB |
546 | static struct irqaction irq_resched = { |
547 | .handler = ipi_resched_interrupt, | |
548 | .flags = IRQF_PERCPU, | |
549 | .name = "IPI resched" | |
550 | }; | |
551 | ||
552 | static struct irqaction irq_call = { | |
553 | .handler = ipi_call_interrupt, | |
554 | .flags = IRQF_PERCPU, | |
555 | .name = "IPI call" | |
556 | }; | |
557 | ||
558 | static __init void gic_ipi_init_one(unsigned int intr, int cpu, | |
559 | struct irqaction *action) | |
560 | { | |
e9de688d AB |
561 | int virq = irq_create_mapping(gic_irq_domain, |
562 | GIC_SHARED_TO_HWIRQ(intr)); | |
18743d27 AB |
563 | int i; |
564 | ||
5f68fea0 | 565 | gic_map_to_vpe(intr, cpu); |
c49581a4 AB |
566 | for (i = 0; i < NR_CPUS; i++) |
567 | clear_bit(intr, pcpu_masks[i].pcpu_mask); | |
b0a88ae5 JD |
568 | set_bit(intr, pcpu_masks[cpu].pcpu_mask); |
569 | ||
18743d27 AB |
570 | irq_set_irq_type(virq, IRQ_TYPE_EDGE_RISING); |
571 | ||
572 | irq_set_handler(virq, handle_percpu_irq); | |
573 | setup_irq(virq, action); | |
39b8d525 RB |
574 | } |
575 | ||
18743d27 | 576 | static __init void gic_ipi_init(void) |
39b8d525 | 577 | { |
18743d27 AB |
578 | int i; |
579 | ||
580 | /* Use last 2 * NR_CPUS interrupts as IPIs */ | |
fbd55241 | 581 | gic_resched_int_base = gic_shared_intrs - nr_cpu_ids; |
18743d27 AB |
582 | gic_call_int_base = gic_resched_int_base - nr_cpu_ids; |
583 | ||
584 | for (i = 0; i < nr_cpu_ids; i++) { | |
585 | gic_ipi_init_one(gic_call_int_base + i, i, &irq_call); | |
586 | gic_ipi_init_one(gic_resched_int_base + i, i, &irq_resched); | |
587 | } | |
588 | } | |
589 | #else | |
590 | static inline void gic_ipi_init(void) | |
591 | { | |
592 | } | |
593 | #endif | |
594 | ||
e9de688d | 595 | static void __init gic_basic_init(void) |
18743d27 AB |
596 | { |
597 | unsigned int i; | |
98b67c37 SH |
598 | |
599 | board_bind_eic_interrupt = &gic_bind_eic_interrupt; | |
39b8d525 RB |
600 | |
601 | /* Setup defaults */ | |
fbd55241 | 602 | for (i = 0; i < gic_shared_intrs; i++) { |
5f68fea0 AB |
603 | gic_set_polarity(i, GIC_POL_POS); |
604 | gic_set_trigger(i, GIC_TRIG_LEVEL); | |
605 | gic_reset_mask(i); | |
39b8d525 RB |
606 | } |
607 | ||
e9de688d AB |
608 | for (i = 0; i < gic_vpes; i++) { |
609 | unsigned int j; | |
610 | ||
5f68fea0 | 611 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); |
e9de688d AB |
612 | for (j = 0; j < GIC_NUM_LOCAL_INTRS; j++) { |
613 | if (!gic_local_irq_is_routable(j)) | |
614 | continue; | |
5f68fea0 | 615 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << j); |
e9de688d AB |
616 | } |
617 | } | |
39b8d525 RB |
618 | } |
619 | ||
e9de688d AB |
620 | static int gic_local_irq_domain_map(struct irq_domain *d, unsigned int virq, |
621 | irq_hw_number_t hw) | |
c49581a4 | 622 | { |
e9de688d AB |
623 | int intr = GIC_HWIRQ_TO_LOCAL(hw); |
624 | int ret = 0; | |
625 | int i; | |
626 | unsigned long flags; | |
627 | ||
628 | if (!gic_local_irq_is_routable(intr)) | |
629 | return -EPERM; | |
630 | ||
631 | /* | |
632 | * HACK: These are all really percpu interrupts, but the rest | |
633 | * of the MIPS kernel code does not use the percpu IRQ API for | |
634 | * the CP0 timer and performance counter interrupts. | |
635 | */ | |
b720fd8b JH |
636 | switch (intr) { |
637 | case GIC_LOCAL_INT_TIMER: | |
638 | case GIC_LOCAL_INT_PERFCTR: | |
639 | case GIC_LOCAL_INT_FDC: | |
640 | irq_set_chip_and_handler(virq, | |
641 | &gic_all_vpes_local_irq_controller, | |
642 | handle_percpu_irq); | |
643 | break; | |
644 | default: | |
e9de688d AB |
645 | irq_set_chip_and_handler(virq, |
646 | &gic_local_irq_controller, | |
647 | handle_percpu_devid_irq); | |
648 | irq_set_percpu_devid(virq); | |
b720fd8b | 649 | break; |
e9de688d AB |
650 | } |
651 | ||
652 | spin_lock_irqsave(&gic_lock, flags); | |
653 | for (i = 0; i < gic_vpes; i++) { | |
654 | u32 val = GIC_MAP_TO_PIN_MSK | gic_cpu_pin; | |
655 | ||
5f68fea0 | 656 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); |
e9de688d AB |
657 | |
658 | switch (intr) { | |
659 | case GIC_LOCAL_INT_WD: | |
5f68fea0 | 660 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_WD_MAP), val); |
e9de688d AB |
661 | break; |
662 | case GIC_LOCAL_INT_COMPARE: | |
5f68fea0 | 663 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_MAP), val); |
e9de688d AB |
664 | break; |
665 | case GIC_LOCAL_INT_TIMER: | |
1b6af71a JH |
666 | /* CONFIG_MIPS_CMP workaround (see __gic_init) */ |
667 | val = GIC_MAP_TO_PIN_MSK | timer_cpu_pin; | |
5f68fea0 | 668 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP), val); |
e9de688d AB |
669 | break; |
670 | case GIC_LOCAL_INT_PERFCTR: | |
5f68fea0 | 671 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP), val); |
e9de688d AB |
672 | break; |
673 | case GIC_LOCAL_INT_SWINT0: | |
5f68fea0 | 674 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT0_MAP), val); |
e9de688d AB |
675 | break; |
676 | case GIC_LOCAL_INT_SWINT1: | |
5f68fea0 | 677 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT1_MAP), val); |
e9de688d AB |
678 | break; |
679 | case GIC_LOCAL_INT_FDC: | |
5f68fea0 | 680 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_FDC_MAP), val); |
e9de688d AB |
681 | break; |
682 | default: | |
683 | pr_err("Invalid local IRQ %d\n", intr); | |
684 | ret = -EINVAL; | |
685 | break; | |
686 | } | |
687 | } | |
688 | spin_unlock_irqrestore(&gic_lock, flags); | |
689 | ||
690 | return ret; | |
691 | } | |
692 | ||
693 | static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq, | |
694 | irq_hw_number_t hw) | |
695 | { | |
696 | int intr = GIC_HWIRQ_TO_SHARED(hw); | |
c49581a4 AB |
697 | unsigned long flags; |
698 | ||
4a6a3ea3 AB |
699 | irq_set_chip_and_handler(virq, &gic_level_irq_controller, |
700 | handle_level_irq); | |
c49581a4 AB |
701 | |
702 | spin_lock_irqsave(&gic_lock, flags); | |
5f68fea0 | 703 | gic_map_to_pin(intr, gic_cpu_pin); |
c49581a4 | 704 | /* Map to VPE 0 by default */ |
5f68fea0 | 705 | gic_map_to_vpe(intr, 0); |
e9de688d | 706 | set_bit(intr, pcpu_masks[0].pcpu_mask); |
c49581a4 AB |
707 | spin_unlock_irqrestore(&gic_lock, flags); |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
e9de688d AB |
712 | static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq, |
713 | irq_hw_number_t hw) | |
714 | { | |
715 | if (GIC_HWIRQ_TO_LOCAL(hw) < GIC_NUM_LOCAL_INTRS) | |
716 | return gic_local_irq_domain_map(d, virq, hw); | |
717 | return gic_shared_irq_domain_map(d, virq, hw); | |
718 | } | |
719 | ||
a7057270 AB |
720 | static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr, |
721 | const u32 *intspec, unsigned int intsize, | |
722 | irq_hw_number_t *out_hwirq, | |
723 | unsigned int *out_type) | |
724 | { | |
725 | if (intsize != 3) | |
726 | return -EINVAL; | |
727 | ||
728 | if (intspec[0] == GIC_SHARED) | |
729 | *out_hwirq = GIC_SHARED_TO_HWIRQ(intspec[1]); | |
730 | else if (intspec[0] == GIC_LOCAL) | |
731 | *out_hwirq = GIC_LOCAL_TO_HWIRQ(intspec[1]); | |
732 | else | |
733 | return -EINVAL; | |
734 | *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK; | |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
96009736 | 739 | static const struct irq_domain_ops gic_irq_domain_ops = { |
c49581a4 | 740 | .map = gic_irq_domain_map, |
a7057270 | 741 | .xlate = gic_irq_domain_xlate, |
c49581a4 AB |
742 | }; |
743 | ||
a7057270 AB |
744 | static void __init __gic_init(unsigned long gic_base_addr, |
745 | unsigned long gic_addrspace_size, | |
746 | unsigned int cpu_vec, unsigned int irqbase, | |
747 | struct device_node *node) | |
39b8d525 RB |
748 | { |
749 | unsigned int gicconfig; | |
750 | ||
5f68fea0 | 751 | gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size); |
39b8d525 | 752 | |
5f68fea0 | 753 | gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); |
fbd55241 | 754 | gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >> |
39b8d525 | 755 | GIC_SH_CONFIG_NUMINTRS_SHF; |
fbd55241 | 756 | gic_shared_intrs = ((gic_shared_intrs + 1) * 8); |
39b8d525 | 757 | |
e9de688d | 758 | gic_vpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >> |
39b8d525 | 759 | GIC_SH_CONFIG_NUMVPES_SHF; |
e9de688d | 760 | gic_vpes = gic_vpes + 1; |
39b8d525 | 761 | |
18743d27 AB |
762 | if (cpu_has_veic) { |
763 | /* Always use vector 1 in EIC mode */ | |
764 | gic_cpu_pin = 0; | |
1b6af71a | 765 | timer_cpu_pin = gic_cpu_pin; |
18743d27 AB |
766 | set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET, |
767 | __gic_irq_dispatch); | |
768 | } else { | |
769 | gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET; | |
770 | irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec, | |
771 | gic_irq_dispatch); | |
1b6af71a JH |
772 | /* |
773 | * With the CMP implementation of SMP (deprecated), other CPUs | |
774 | * are started by the bootloader and put into a timer based | |
775 | * waiting poll loop. We must not re-route those CPU's local | |
776 | * timer interrupts as the wait instruction will never finish, | |
777 | * so just handle whatever CPU interrupt it is routed to by | |
778 | * default. | |
779 | * | |
780 | * This workaround should be removed when CMP support is | |
781 | * dropped. | |
782 | */ | |
783 | if (IS_ENABLED(CONFIG_MIPS_CMP) && | |
784 | gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) { | |
785 | timer_cpu_pin = gic_read(GIC_REG(VPE_LOCAL, | |
786 | GIC_VPE_TIMER_MAP)) & | |
787 | GIC_MAP_MSK; | |
788 | irq_set_chained_handler(MIPS_CPU_IRQ_BASE + | |
789 | GIC_CPU_PIN_OFFSET + | |
790 | timer_cpu_pin, | |
791 | gic_irq_dispatch); | |
792 | } else { | |
793 | timer_cpu_pin = gic_cpu_pin; | |
794 | } | |
18743d27 AB |
795 | } |
796 | ||
a7057270 | 797 | gic_irq_domain = irq_domain_add_simple(node, GIC_NUM_LOCAL_INTRS + |
e9de688d | 798 | gic_shared_intrs, irqbase, |
c49581a4 AB |
799 | &gic_irq_domain_ops, NULL); |
800 | if (!gic_irq_domain) | |
801 | panic("Failed to add GIC IRQ domain"); | |
0b271f56 | 802 | |
e9de688d | 803 | gic_basic_init(); |
18743d27 AB |
804 | |
805 | gic_ipi_init(); | |
39b8d525 | 806 | } |
a7057270 AB |
807 | |
808 | void __init gic_init(unsigned long gic_base_addr, | |
809 | unsigned long gic_addrspace_size, | |
810 | unsigned int cpu_vec, unsigned int irqbase) | |
811 | { | |
812 | __gic_init(gic_base_addr, gic_addrspace_size, cpu_vec, irqbase, NULL); | |
813 | } | |
814 | ||
815 | static int __init gic_of_init(struct device_node *node, | |
816 | struct device_node *parent) | |
817 | { | |
818 | struct resource res; | |
819 | unsigned int cpu_vec, i = 0, reserved = 0; | |
820 | phys_addr_t gic_base; | |
821 | size_t gic_len; | |
822 | ||
823 | /* Find the first available CPU vector. */ | |
824 | while (!of_property_read_u32_index(node, "mti,reserved-cpu-vectors", | |
825 | i++, &cpu_vec)) | |
826 | reserved |= BIT(cpu_vec); | |
827 | for (cpu_vec = 2; cpu_vec < 8; cpu_vec++) { | |
828 | if (!(reserved & BIT(cpu_vec))) | |
829 | break; | |
830 | } | |
831 | if (cpu_vec == 8) { | |
832 | pr_err("No CPU vectors available for GIC\n"); | |
833 | return -ENODEV; | |
834 | } | |
835 | ||
836 | if (of_address_to_resource(node, 0, &res)) { | |
837 | /* | |
838 | * Probe the CM for the GIC base address if not specified | |
839 | * in the device-tree. | |
840 | */ | |
841 | if (mips_cm_present()) { | |
842 | gic_base = read_gcr_gic_base() & | |
843 | ~CM_GCR_GIC_BASE_GICEN_MSK; | |
844 | gic_len = 0x20000; | |
845 | } else { | |
846 | pr_err("Failed to get GIC memory range\n"); | |
847 | return -ENODEV; | |
848 | } | |
849 | } else { | |
850 | gic_base = res.start; | |
851 | gic_len = resource_size(&res); | |
852 | } | |
853 | ||
854 | if (mips_cm_present()) | |
855 | write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN_MSK); | |
856 | gic_present = true; | |
857 | ||
858 | __gic_init(gic_base, gic_len, cpu_vec, 0, node); | |
859 | ||
860 | return 0; | |
861 | } | |
862 | IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init); |