Commit | Line | Data |
---|---|---|
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 | 26 | unsigned int gic_present; |
98b67c37 | 27 | |
822350bc | 28 | struct gic_pcpu_mask { |
fbd55241 | 29 | DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS); |
822350bc JD |
30 | }; |
31 | ||
5f68fea0 | 32 | static void __iomem *gic_base; |
0b271f56 | 33 | static struct gic_pcpu_mask pcpu_masks[NR_CPUS]; |
95150ae8 | 34 | static DEFINE_SPINLOCK(gic_lock); |
c49581a4 | 35 | static struct irq_domain *gic_irq_domain; |
fbd55241 | 36 | static int gic_shared_intrs; |
e9de688d | 37 | static int gic_vpes; |
3263d085 | 38 | static unsigned int gic_cpu_pin; |
1b6af71a | 39 | static unsigned int timer_cpu_pin; |
4a6a3ea3 | 40 | static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller; |
39b8d525 | 41 | |
18743d27 AB |
42 | static void __gic_irq_dispatch(void); |
43 | ||
c3f57f02 | 44 | static inline u32 gic_read32(unsigned int reg) |
5f68fea0 AB |
45 | { |
46 | return __raw_readl(gic_base + reg); | |
47 | } | |
48 | ||
c3f57f02 | 49 | static inline u64 gic_read64(unsigned int reg) |
5f68fea0 | 50 | { |
c3f57f02 | 51 | return __raw_readq(gic_base + reg); |
5f68fea0 AB |
52 | } |
53 | ||
c3f57f02 | 54 | static inline unsigned long gic_read(unsigned int reg) |
5f68fea0 | 55 | { |
c3f57f02 MC |
56 | if (!mips_cm_is64) |
57 | return gic_read32(reg); | |
58 | else | |
59 | return gic_read64(reg); | |
60 | } | |
61 | ||
62 | static inline void gic_write32(unsigned int reg, u32 val) | |
63 | { | |
64 | return __raw_writel(val, gic_base + reg); | |
65 | } | |
66 | ||
67 | static inline void gic_write64(unsigned int reg, u64 val) | |
68 | { | |
69 | return __raw_writeq(val, gic_base + reg); | |
70 | } | |
71 | ||
72 | static inline void gic_write(unsigned int reg, unsigned long val) | |
73 | { | |
74 | if (!mips_cm_is64) | |
75 | return gic_write32(reg, (u32)val); | |
76 | else | |
77 | return gic_write64(reg, (u64)val); | |
78 | } | |
79 | ||
80 | static inline void gic_update_bits(unsigned int reg, unsigned long mask, | |
81 | unsigned long val) | |
82 | { | |
83 | unsigned long regval; | |
5f68fea0 AB |
84 | |
85 | regval = gic_read(reg); | |
86 | regval &= ~mask; | |
87 | regval |= val; | |
88 | gic_write(reg, regval); | |
89 | } | |
90 | ||
91 | static inline void gic_reset_mask(unsigned int intr) | |
92 | { | |
93 | gic_write(GIC_REG(SHARED, GIC_SH_RMASK) + GIC_INTR_OFS(intr), | |
c3f57f02 | 94 | 1ul << GIC_INTR_BIT(intr)); |
5f68fea0 AB |
95 | } |
96 | ||
97 | static inline void gic_set_mask(unsigned int intr) | |
98 | { | |
99 | gic_write(GIC_REG(SHARED, GIC_SH_SMASK) + GIC_INTR_OFS(intr), | |
c3f57f02 | 100 | 1ul << GIC_INTR_BIT(intr)); |
5f68fea0 AB |
101 | } |
102 | ||
103 | static inline void gic_set_polarity(unsigned int intr, unsigned int pol) | |
104 | { | |
105 | gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_POLARITY) + | |
c3f57f02 MC |
106 | GIC_INTR_OFS(intr), 1ul << GIC_INTR_BIT(intr), |
107 | (unsigned long)pol << GIC_INTR_BIT(intr)); | |
5f68fea0 AB |
108 | } |
109 | ||
110 | static inline void gic_set_trigger(unsigned int intr, unsigned int trig) | |
111 | { | |
112 | gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_TRIGGER) + | |
c3f57f02 MC |
113 | GIC_INTR_OFS(intr), 1ul << GIC_INTR_BIT(intr), |
114 | (unsigned long)trig << GIC_INTR_BIT(intr)); | |
5f68fea0 AB |
115 | } |
116 | ||
117 | static inline void gic_set_dual_edge(unsigned int intr, unsigned int dual) | |
118 | { | |
119 | gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_DUAL) + GIC_INTR_OFS(intr), | |
c3f57f02 MC |
120 | 1ul << GIC_INTR_BIT(intr), |
121 | (unsigned long)dual << GIC_INTR_BIT(intr)); | |
5f68fea0 AB |
122 | } |
123 | ||
124 | static inline void gic_map_to_pin(unsigned int intr, unsigned int pin) | |
125 | { | |
c3f57f02 MC |
126 | gic_write32(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_PIN_BASE) + |
127 | GIC_SH_MAP_TO_PIN(intr), GIC_MAP_TO_PIN_MSK | pin); | |
5f68fea0 AB |
128 | } |
129 | ||
130 | static inline void gic_map_to_vpe(unsigned int intr, unsigned int vpe) | |
131 | { | |
132 | gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_VPE_BASE) + | |
133 | GIC_SH_MAP_TO_VPE_REG_OFF(intr, vpe), | |
134 | GIC_SH_MAP_TO_VPE_REG_BIT(vpe)); | |
135 | } | |
136 | ||
a331ce63 | 137 | #ifdef CONFIG_CLKSRC_MIPS_GIC |
dfa762e1 SH |
138 | cycle_t gic_read_count(void) |
139 | { | |
140 | unsigned int hi, hi2, lo; | |
141 | ||
6f50c835 MC |
142 | if (mips_cm_is64) |
143 | return (cycle_t)gic_read(GIC_REG(SHARED, GIC_SH_COUNTER)); | |
144 | ||
dfa762e1 | 145 | do { |
c3f57f02 MC |
146 | hi = gic_read32(GIC_REG(SHARED, GIC_SH_COUNTER_63_32)); |
147 | lo = gic_read32(GIC_REG(SHARED, GIC_SH_COUNTER_31_00)); | |
148 | hi2 = gic_read32(GIC_REG(SHARED, GIC_SH_COUNTER_63_32)); | |
dfa762e1 SH |
149 | } while (hi2 != hi); |
150 | ||
151 | return (((cycle_t) hi) << 32) + lo; | |
152 | } | |
0ab2b7d0 | 153 | |
387904ff AB |
154 | unsigned int gic_get_count_width(void) |
155 | { | |
156 | unsigned int bits, config; | |
157 | ||
5f68fea0 | 158 | config = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); |
387904ff AB |
159 | bits = 32 + 4 * ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >> |
160 | GIC_SH_CONFIG_COUNTBITS_SHF); | |
161 | ||
162 | return bits; | |
163 | } | |
164 | ||
0ab2b7d0 RG |
165 | void gic_write_compare(cycle_t cnt) |
166 | { | |
6f50c835 MC |
167 | if (mips_cm_is64) { |
168 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE), cnt); | |
169 | } else { | |
170 | gic_write32(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI), | |
171 | (int)(cnt >> 32)); | |
172 | gic_write32(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO), | |
173 | (int)(cnt & 0xffffffff)); | |
174 | } | |
0ab2b7d0 RG |
175 | } |
176 | ||
414408d0 PB |
177 | void gic_write_cpu_compare(cycle_t cnt, int cpu) |
178 | { | |
179 | unsigned long flags; | |
180 | ||
181 | local_irq_save(flags); | |
182 | ||
5f68fea0 | 183 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), cpu); |
6f50c835 MC |
184 | |
185 | if (mips_cm_is64) { | |
186 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE), cnt); | |
187 | } else { | |
188 | gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_HI), | |
189 | (int)(cnt >> 32)); | |
190 | gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_LO), | |
191 | (int)(cnt & 0xffffffff)); | |
192 | } | |
414408d0 PB |
193 | |
194 | local_irq_restore(flags); | |
195 | } | |
196 | ||
0ab2b7d0 RG |
197 | cycle_t gic_read_compare(void) |
198 | { | |
199 | unsigned int hi, lo; | |
200 | ||
6f50c835 MC |
201 | if (mips_cm_is64) |
202 | return (cycle_t)gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE)); | |
203 | ||
c3f57f02 MC |
204 | hi = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI)); |
205 | lo = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO)); | |
0ab2b7d0 RG |
206 | |
207 | return (((cycle_t) hi) << 32) + lo; | |
208 | } | |
8fa4b930 MC |
209 | |
210 | void gic_start_count(void) | |
211 | { | |
212 | u32 gicconfig; | |
213 | ||
214 | /* Start the counter */ | |
215 | gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); | |
216 | gicconfig &= ~(1 << GIC_SH_CONFIG_COUNTSTOP_SHF); | |
217 | gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig); | |
218 | } | |
219 | ||
220 | void gic_stop_count(void) | |
221 | { | |
222 | u32 gicconfig; | |
223 | ||
224 | /* Stop the counter */ | |
225 | gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); | |
226 | gicconfig |= 1 << GIC_SH_CONFIG_COUNTSTOP_SHF; | |
227 | gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig); | |
228 | } | |
229 | ||
dfa762e1 SH |
230 | #endif |
231 | ||
e9de688d AB |
232 | static bool gic_local_irq_is_routable(int intr) |
233 | { | |
234 | u32 vpe_ctl; | |
235 | ||
236 | /* All local interrupts are routable in EIC mode. */ | |
237 | if (cpu_has_veic) | |
238 | return true; | |
239 | ||
c3f57f02 | 240 | vpe_ctl = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_CTL)); |
e9de688d AB |
241 | switch (intr) { |
242 | case GIC_LOCAL_INT_TIMER: | |
243 | return vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK; | |
244 | case GIC_LOCAL_INT_PERFCTR: | |
245 | return vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK; | |
246 | case GIC_LOCAL_INT_FDC: | |
247 | return vpe_ctl & GIC_VPE_CTL_FDC_RTBL_MSK; | |
248 | case GIC_LOCAL_INT_SWINT0: | |
249 | case GIC_LOCAL_INT_SWINT1: | |
250 | return vpe_ctl & GIC_VPE_CTL_SWINT_RTBL_MSK; | |
251 | default: | |
252 | return true; | |
253 | } | |
254 | } | |
255 | ||
3263d085 | 256 | static void gic_bind_eic_interrupt(int irq, int set) |
98b67c37 SH |
257 | { |
258 | /* Convert irq vector # to hw int # */ | |
259 | irq -= GIC_PIN_TO_VEC_OFFSET; | |
260 | ||
261 | /* Set irq to use shadow set */ | |
5f68fea0 AB |
262 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_EIC_SHADOW_SET_BASE) + |
263 | GIC_VPE_EIC_SS(irq), set); | |
98b67c37 SH |
264 | } |
265 | ||
39b8d525 RB |
266 | void gic_send_ipi(unsigned int intr) |
267 | { | |
53a7bc81 | 268 | gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_SET(intr)); |
39b8d525 RB |
269 | } |
270 | ||
e9de688d AB |
271 | int gic_get_c0_compare_int(void) |
272 | { | |
273 | if (!gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) | |
274 | return MIPS_CPU_IRQ_BASE + cp0_compare_irq; | |
275 | return irq_create_mapping(gic_irq_domain, | |
276 | GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_TIMER)); | |
277 | } | |
278 | ||
279 | int gic_get_c0_perfcount_int(void) | |
280 | { | |
281 | if (!gic_local_irq_is_routable(GIC_LOCAL_INT_PERFCTR)) { | |
7e3e6cb2 | 282 | /* Is the performance counter shared with the timer? */ |
e9de688d AB |
283 | if (cp0_perfcount_irq < 0) |
284 | return -1; | |
285 | return MIPS_CPU_IRQ_BASE + cp0_perfcount_irq; | |
286 | } | |
287 | return irq_create_mapping(gic_irq_domain, | |
288 | GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_PERFCTR)); | |
289 | } | |
290 | ||
6429e2b6 JH |
291 | int gic_get_c0_fdc_int(void) |
292 | { | |
293 | if (!gic_local_irq_is_routable(GIC_LOCAL_INT_FDC)) { | |
294 | /* Is the FDC IRQ even present? */ | |
295 | if (cp0_fdc_irq < 0) | |
296 | return -1; | |
297 | return MIPS_CPU_IRQ_BASE + cp0_fdc_irq; | |
298 | } | |
299 | ||
6429e2b6 JH |
300 | return irq_create_mapping(gic_irq_domain, |
301 | GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_FDC)); | |
302 | } | |
303 | ||
1b3ed367 | 304 | static void gic_handle_shared_int(bool chained) |
39b8d525 | 305 | { |
c3f57f02 | 306 | unsigned int i, intr, virq, gic_reg_step = mips_cm_is64 ? 8 : 4; |
8f5ee79c | 307 | unsigned long *pcpu_mask; |
5f68fea0 | 308 | unsigned long pending_reg, intrmask_reg; |
8f5ee79c AB |
309 | DECLARE_BITMAP(pending, GIC_MAX_INTRS); |
310 | DECLARE_BITMAP(intrmask, GIC_MAX_INTRS); | |
39b8d525 RB |
311 | |
312 | /* Get per-cpu bitmaps */ | |
39b8d525 RB |
313 | pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask; |
314 | ||
824f3f7f AB |
315 | pending_reg = GIC_REG(SHARED, GIC_SH_PEND); |
316 | intrmask_reg = GIC_REG(SHARED, GIC_SH_MASK); | |
39b8d525 | 317 | |
fbd55241 | 318 | for (i = 0; i < BITS_TO_LONGS(gic_shared_intrs); i++) { |
5f68fea0 AB |
319 | pending[i] = gic_read(pending_reg); |
320 | intrmask[i] = gic_read(intrmask_reg); | |
c3f57f02 MC |
321 | pending_reg += gic_reg_step; |
322 | intrmask_reg += gic_reg_step; | |
39b8d525 RB |
323 | } |
324 | ||
fbd55241 AB |
325 | bitmap_and(pending, pending, intrmask, gic_shared_intrs); |
326 | bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs); | |
39b8d525 | 327 | |
d7eb4f2e QY |
328 | intr = find_first_bit(pending, gic_shared_intrs); |
329 | while (intr != gic_shared_intrs) { | |
330 | virq = irq_linear_revmap(gic_irq_domain, | |
331 | GIC_SHARED_TO_HWIRQ(intr)); | |
1b3ed367 RV |
332 | if (chained) |
333 | generic_handle_irq(virq); | |
334 | else | |
335 | do_IRQ(virq); | |
d7eb4f2e QY |
336 | |
337 | /* go to next pending bit */ | |
338 | bitmap_clear(pending, intr, 1); | |
339 | intr = find_first_bit(pending, gic_shared_intrs); | |
340 | } | |
39b8d525 RB |
341 | } |
342 | ||
161d049e | 343 | static void gic_mask_irq(struct irq_data *d) |
39b8d525 | 344 | { |
5f68fea0 | 345 | gic_reset_mask(GIC_HWIRQ_TO_SHARED(d->hwirq)); |
39b8d525 RB |
346 | } |
347 | ||
161d049e | 348 | static void gic_unmask_irq(struct irq_data *d) |
39b8d525 | 349 | { |
5f68fea0 | 350 | gic_set_mask(GIC_HWIRQ_TO_SHARED(d->hwirq)); |
39b8d525 RB |
351 | } |
352 | ||
5561c9e4 AB |
353 | static void gic_ack_irq(struct irq_data *d) |
354 | { | |
e9de688d | 355 | unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); |
c49581a4 | 356 | |
53a7bc81 | 357 | gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_CLR(irq)); |
5561c9e4 AB |
358 | } |
359 | ||
95150ae8 AB |
360 | static int gic_set_type(struct irq_data *d, unsigned int type) |
361 | { | |
e9de688d | 362 | unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); |
95150ae8 AB |
363 | unsigned long flags; |
364 | bool is_edge; | |
365 | ||
366 | spin_lock_irqsave(&gic_lock, flags); | |
367 | switch (type & IRQ_TYPE_SENSE_MASK) { | |
368 | case IRQ_TYPE_EDGE_FALLING: | |
5f68fea0 AB |
369 | gic_set_polarity(irq, GIC_POL_NEG); |
370 | gic_set_trigger(irq, GIC_TRIG_EDGE); | |
371 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); | |
95150ae8 AB |
372 | is_edge = true; |
373 | break; | |
374 | case IRQ_TYPE_EDGE_RISING: | |
5f68fea0 AB |
375 | gic_set_polarity(irq, GIC_POL_POS); |
376 | gic_set_trigger(irq, GIC_TRIG_EDGE); | |
377 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); | |
95150ae8 AB |
378 | is_edge = true; |
379 | break; | |
380 | case IRQ_TYPE_EDGE_BOTH: | |
381 | /* polarity is irrelevant in this case */ | |
5f68fea0 AB |
382 | gic_set_trigger(irq, GIC_TRIG_EDGE); |
383 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_ENABLE); | |
95150ae8 AB |
384 | is_edge = true; |
385 | break; | |
386 | case IRQ_TYPE_LEVEL_LOW: | |
5f68fea0 AB |
387 | gic_set_polarity(irq, GIC_POL_NEG); |
388 | gic_set_trigger(irq, GIC_TRIG_LEVEL); | |
389 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); | |
95150ae8 AB |
390 | is_edge = false; |
391 | break; | |
392 | case IRQ_TYPE_LEVEL_HIGH: | |
393 | default: | |
5f68fea0 AB |
394 | gic_set_polarity(irq, GIC_POL_POS); |
395 | gic_set_trigger(irq, GIC_TRIG_LEVEL); | |
396 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); | |
95150ae8 AB |
397 | is_edge = false; |
398 | break; | |
399 | } | |
400 | ||
a595fc51 TG |
401 | if (is_edge) |
402 | irq_set_chip_handler_name_locked(d, &gic_edge_irq_controller, | |
403 | handle_edge_irq, NULL); | |
404 | else | |
405 | irq_set_chip_handler_name_locked(d, &gic_level_irq_controller, | |
406 | handle_level_irq, NULL); | |
95150ae8 | 407 | spin_unlock_irqrestore(&gic_lock, flags); |
39b8d525 | 408 | |
95150ae8 AB |
409 | return 0; |
410 | } | |
411 | ||
412 | #ifdef CONFIG_SMP | |
161d049e TG |
413 | static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask, |
414 | bool force) | |
39b8d525 | 415 | { |
e9de688d | 416 | unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); |
39b8d525 RB |
417 | cpumask_t tmp = CPU_MASK_NONE; |
418 | unsigned long flags; | |
419 | int i; | |
420 | ||
0de26520 | 421 | cpumask_and(&tmp, cpumask, cpu_online_mask); |
f9b531fe | 422 | if (cpumask_empty(&tmp)) |
14d160ab | 423 | return -EINVAL; |
39b8d525 RB |
424 | |
425 | /* Assumption : cpumask refers to a single CPU */ | |
426 | spin_lock_irqsave(&gic_lock, flags); | |
39b8d525 | 427 | |
c214c035 | 428 | /* Re-route this IRQ */ |
f9b531fe | 429 | gic_map_to_vpe(irq, cpumask_first(&tmp)); |
c214c035 TW |
430 | |
431 | /* Update the pcpu_masks */ | |
432 | for (i = 0; i < NR_CPUS; i++) | |
433 | clear_bit(irq, pcpu_masks[i].pcpu_mask); | |
f9b531fe | 434 | set_bit(irq, pcpu_masks[cpumask_first(&tmp)].pcpu_mask); |
39b8d525 | 435 | |
72f86db4 | 436 | cpumask_copy(irq_data_get_affinity_mask(d), cpumask); |
39b8d525 RB |
437 | spin_unlock_irqrestore(&gic_lock, flags); |
438 | ||
161d049e | 439 | return IRQ_SET_MASK_OK_NOCOPY; |
39b8d525 RB |
440 | } |
441 | #endif | |
442 | ||
4a6a3ea3 AB |
443 | static struct irq_chip gic_level_irq_controller = { |
444 | .name = "MIPS GIC", | |
445 | .irq_mask = gic_mask_irq, | |
446 | .irq_unmask = gic_unmask_irq, | |
447 | .irq_set_type = gic_set_type, | |
448 | #ifdef CONFIG_SMP | |
449 | .irq_set_affinity = gic_set_affinity, | |
450 | #endif | |
451 | }; | |
452 | ||
453 | static struct irq_chip gic_edge_irq_controller = { | |
161d049e | 454 | .name = "MIPS GIC", |
5561c9e4 | 455 | .irq_ack = gic_ack_irq, |
161d049e | 456 | .irq_mask = gic_mask_irq, |
161d049e | 457 | .irq_unmask = gic_unmask_irq, |
95150ae8 | 458 | .irq_set_type = gic_set_type, |
39b8d525 | 459 | #ifdef CONFIG_SMP |
161d049e | 460 | .irq_set_affinity = gic_set_affinity, |
39b8d525 RB |
461 | #endif |
462 | }; | |
463 | ||
1b3ed367 | 464 | static void gic_handle_local_int(bool chained) |
e9de688d AB |
465 | { |
466 | unsigned long pending, masked; | |
d7eb4f2e | 467 | unsigned int intr, virq; |
e9de688d | 468 | |
c3f57f02 MC |
469 | pending = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_PEND)); |
470 | masked = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_MASK)); | |
e9de688d AB |
471 | |
472 | bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS); | |
473 | ||
d7eb4f2e QY |
474 | intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS); |
475 | while (intr != GIC_NUM_LOCAL_INTRS) { | |
476 | virq = irq_linear_revmap(gic_irq_domain, | |
477 | GIC_LOCAL_TO_HWIRQ(intr)); | |
1b3ed367 RV |
478 | if (chained) |
479 | generic_handle_irq(virq); | |
480 | else | |
481 | do_IRQ(virq); | |
d7eb4f2e QY |
482 | |
483 | /* go to next pending bit */ | |
484 | bitmap_clear(&pending, intr, 1); | |
485 | intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS); | |
486 | } | |
e9de688d AB |
487 | } |
488 | ||
489 | static void gic_mask_local_irq(struct irq_data *d) | |
490 | { | |
491 | int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); | |
492 | ||
c3f57f02 | 493 | gic_write32(GIC_REG(VPE_LOCAL, GIC_VPE_RMASK), 1 << intr); |
e9de688d AB |
494 | } |
495 | ||
496 | static void gic_unmask_local_irq(struct irq_data *d) | |
497 | { | |
498 | int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); | |
499 | ||
c3f57f02 | 500 | gic_write32(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), 1 << intr); |
e9de688d AB |
501 | } |
502 | ||
503 | static struct irq_chip gic_local_irq_controller = { | |
504 | .name = "MIPS GIC Local", | |
505 | .irq_mask = gic_mask_local_irq, | |
506 | .irq_unmask = gic_unmask_local_irq, | |
507 | }; | |
508 | ||
509 | static void gic_mask_local_irq_all_vpes(struct irq_data *d) | |
510 | { | |
511 | int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); | |
512 | int i; | |
513 | unsigned long flags; | |
514 | ||
515 | spin_lock_irqsave(&gic_lock, flags); | |
516 | for (i = 0; i < gic_vpes; i++) { | |
5f68fea0 | 517 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); |
c3f57f02 | 518 | gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << intr); |
e9de688d AB |
519 | } |
520 | spin_unlock_irqrestore(&gic_lock, flags); | |
521 | } | |
522 | ||
523 | static void gic_unmask_local_irq_all_vpes(struct irq_data *d) | |
524 | { | |
525 | int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); | |
526 | int i; | |
527 | unsigned long flags; | |
528 | ||
529 | spin_lock_irqsave(&gic_lock, flags); | |
530 | for (i = 0; i < gic_vpes; i++) { | |
5f68fea0 | 531 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); |
c3f57f02 | 532 | gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_SMASK), 1 << intr); |
e9de688d AB |
533 | } |
534 | spin_unlock_irqrestore(&gic_lock, flags); | |
535 | } | |
536 | ||
537 | static struct irq_chip gic_all_vpes_local_irq_controller = { | |
538 | .name = "MIPS GIC Local", | |
539 | .irq_mask = gic_mask_local_irq_all_vpes, | |
540 | .irq_unmask = gic_unmask_local_irq_all_vpes, | |
541 | }; | |
542 | ||
18743d27 | 543 | static void __gic_irq_dispatch(void) |
39b8d525 | 544 | { |
1b3ed367 RV |
545 | gic_handle_local_int(false); |
546 | gic_handle_shared_int(false); | |
18743d27 | 547 | } |
39b8d525 | 548 | |
bd0b9ac4 | 549 | static void gic_irq_dispatch(struct irq_desc *desc) |
18743d27 | 550 | { |
1b3ed367 RV |
551 | gic_handle_local_int(true); |
552 | gic_handle_shared_int(true); | |
18743d27 AB |
553 | } |
554 | ||
555 | #ifdef CONFIG_MIPS_GIC_IPI | |
556 | static int gic_resched_int_base; | |
557 | static int gic_call_int_base; | |
558 | ||
559 | unsigned int plat_ipi_resched_int_xlate(unsigned int cpu) | |
560 | { | |
561 | return gic_resched_int_base + cpu; | |
562 | } | |
39b8d525 | 563 | |
18743d27 AB |
564 | unsigned int plat_ipi_call_int_xlate(unsigned int cpu) |
565 | { | |
566 | return gic_call_int_base + cpu; | |
567 | } | |
39b8d525 | 568 | |
18743d27 AB |
569 | static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id) |
570 | { | |
571 | scheduler_ipi(); | |
572 | ||
573 | return IRQ_HANDLED; | |
574 | } | |
575 | ||
576 | static irqreturn_t ipi_call_interrupt(int irq, void *dev_id) | |
577 | { | |
4ace6139 | 578 | generic_smp_call_function_interrupt(); |
18743d27 AB |
579 | |
580 | return IRQ_HANDLED; | |
581 | } | |
b0a88ae5 | 582 | |
18743d27 AB |
583 | static struct irqaction irq_resched = { |
584 | .handler = ipi_resched_interrupt, | |
585 | .flags = IRQF_PERCPU, | |
586 | .name = "IPI resched" | |
587 | }; | |
588 | ||
589 | static struct irqaction irq_call = { | |
590 | .handler = ipi_call_interrupt, | |
591 | .flags = IRQF_PERCPU, | |
592 | .name = "IPI call" | |
593 | }; | |
594 | ||
595 | static __init void gic_ipi_init_one(unsigned int intr, int cpu, | |
596 | struct irqaction *action) | |
597 | { | |
e9de688d AB |
598 | int virq = irq_create_mapping(gic_irq_domain, |
599 | GIC_SHARED_TO_HWIRQ(intr)); | |
18743d27 AB |
600 | int i; |
601 | ||
5f68fea0 | 602 | gic_map_to_vpe(intr, cpu); |
c49581a4 AB |
603 | for (i = 0; i < NR_CPUS; i++) |
604 | clear_bit(intr, pcpu_masks[i].pcpu_mask); | |
b0a88ae5 JD |
605 | set_bit(intr, pcpu_masks[cpu].pcpu_mask); |
606 | ||
18743d27 AB |
607 | irq_set_irq_type(virq, IRQ_TYPE_EDGE_RISING); |
608 | ||
609 | irq_set_handler(virq, handle_percpu_irq); | |
610 | setup_irq(virq, action); | |
39b8d525 RB |
611 | } |
612 | ||
18743d27 | 613 | static __init void gic_ipi_init(void) |
39b8d525 | 614 | { |
18743d27 AB |
615 | int i; |
616 | ||
617 | /* Use last 2 * NR_CPUS interrupts as IPIs */ | |
fbd55241 | 618 | gic_resched_int_base = gic_shared_intrs - nr_cpu_ids; |
18743d27 AB |
619 | gic_call_int_base = gic_resched_int_base - nr_cpu_ids; |
620 | ||
621 | for (i = 0; i < nr_cpu_ids; i++) { | |
622 | gic_ipi_init_one(gic_call_int_base + i, i, &irq_call); | |
623 | gic_ipi_init_one(gic_resched_int_base + i, i, &irq_resched); | |
624 | } | |
625 | } | |
626 | #else | |
627 | static inline void gic_ipi_init(void) | |
628 | { | |
629 | } | |
630 | #endif | |
631 | ||
e9de688d | 632 | static void __init gic_basic_init(void) |
18743d27 AB |
633 | { |
634 | unsigned int i; | |
98b67c37 SH |
635 | |
636 | board_bind_eic_interrupt = &gic_bind_eic_interrupt; | |
39b8d525 RB |
637 | |
638 | /* Setup defaults */ | |
fbd55241 | 639 | for (i = 0; i < gic_shared_intrs; i++) { |
5f68fea0 AB |
640 | gic_set_polarity(i, GIC_POL_POS); |
641 | gic_set_trigger(i, GIC_TRIG_LEVEL); | |
642 | gic_reset_mask(i); | |
39b8d525 RB |
643 | } |
644 | ||
e9de688d AB |
645 | for (i = 0; i < gic_vpes; i++) { |
646 | unsigned int j; | |
647 | ||
5f68fea0 | 648 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); |
e9de688d AB |
649 | for (j = 0; j < GIC_NUM_LOCAL_INTRS; j++) { |
650 | if (!gic_local_irq_is_routable(j)) | |
651 | continue; | |
c3f57f02 | 652 | gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << j); |
e9de688d AB |
653 | } |
654 | } | |
39b8d525 RB |
655 | } |
656 | ||
e9de688d AB |
657 | static int gic_local_irq_domain_map(struct irq_domain *d, unsigned int virq, |
658 | irq_hw_number_t hw) | |
c49581a4 | 659 | { |
e9de688d AB |
660 | int intr = GIC_HWIRQ_TO_LOCAL(hw); |
661 | int ret = 0; | |
662 | int i; | |
663 | unsigned long flags; | |
664 | ||
665 | if (!gic_local_irq_is_routable(intr)) | |
666 | return -EPERM; | |
667 | ||
668 | /* | |
669 | * HACK: These are all really percpu interrupts, but the rest | |
670 | * of the MIPS kernel code does not use the percpu IRQ API for | |
671 | * the CP0 timer and performance counter interrupts. | |
672 | */ | |
b720fd8b JH |
673 | switch (intr) { |
674 | case GIC_LOCAL_INT_TIMER: | |
675 | case GIC_LOCAL_INT_PERFCTR: | |
676 | case GIC_LOCAL_INT_FDC: | |
677 | irq_set_chip_and_handler(virq, | |
678 | &gic_all_vpes_local_irq_controller, | |
679 | handle_percpu_irq); | |
680 | break; | |
681 | default: | |
e9de688d AB |
682 | irq_set_chip_and_handler(virq, |
683 | &gic_local_irq_controller, | |
684 | handle_percpu_devid_irq); | |
685 | irq_set_percpu_devid(virq); | |
b720fd8b | 686 | break; |
e9de688d AB |
687 | } |
688 | ||
689 | spin_lock_irqsave(&gic_lock, flags); | |
690 | for (i = 0; i < gic_vpes; i++) { | |
691 | u32 val = GIC_MAP_TO_PIN_MSK | gic_cpu_pin; | |
692 | ||
5f68fea0 | 693 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); |
e9de688d AB |
694 | |
695 | switch (intr) { | |
696 | case GIC_LOCAL_INT_WD: | |
c3f57f02 | 697 | gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_WD_MAP), val); |
e9de688d AB |
698 | break; |
699 | case GIC_LOCAL_INT_COMPARE: | |
c3f57f02 MC |
700 | gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_MAP), |
701 | val); | |
e9de688d AB |
702 | break; |
703 | case GIC_LOCAL_INT_TIMER: | |
1b6af71a JH |
704 | /* CONFIG_MIPS_CMP workaround (see __gic_init) */ |
705 | val = GIC_MAP_TO_PIN_MSK | timer_cpu_pin; | |
c3f57f02 MC |
706 | gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP), |
707 | val); | |
e9de688d AB |
708 | break; |
709 | case GIC_LOCAL_INT_PERFCTR: | |
c3f57f02 MC |
710 | gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP), |
711 | val); | |
e9de688d AB |
712 | break; |
713 | case GIC_LOCAL_INT_SWINT0: | |
c3f57f02 MC |
714 | gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_SWINT0_MAP), |
715 | val); | |
e9de688d AB |
716 | break; |
717 | case GIC_LOCAL_INT_SWINT1: | |
c3f57f02 MC |
718 | gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_SWINT1_MAP), |
719 | val); | |
e9de688d AB |
720 | break; |
721 | case GIC_LOCAL_INT_FDC: | |
c3f57f02 | 722 | gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_FDC_MAP), val); |
e9de688d AB |
723 | break; |
724 | default: | |
725 | pr_err("Invalid local IRQ %d\n", intr); | |
726 | ret = -EINVAL; | |
727 | break; | |
728 | } | |
729 | } | |
730 | spin_unlock_irqrestore(&gic_lock, flags); | |
731 | ||
732 | return ret; | |
733 | } | |
734 | ||
735 | static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq, | |
736 | irq_hw_number_t hw) | |
737 | { | |
738 | int intr = GIC_HWIRQ_TO_SHARED(hw); | |
c49581a4 AB |
739 | unsigned long flags; |
740 | ||
4a6a3ea3 AB |
741 | irq_set_chip_and_handler(virq, &gic_level_irq_controller, |
742 | handle_level_irq); | |
c49581a4 AB |
743 | |
744 | spin_lock_irqsave(&gic_lock, flags); | |
5f68fea0 | 745 | gic_map_to_pin(intr, gic_cpu_pin); |
c49581a4 | 746 | /* Map to VPE 0 by default */ |
5f68fea0 | 747 | gic_map_to_vpe(intr, 0); |
e9de688d | 748 | set_bit(intr, pcpu_masks[0].pcpu_mask); |
c49581a4 AB |
749 | spin_unlock_irqrestore(&gic_lock, flags); |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
e9de688d AB |
754 | static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq, |
755 | irq_hw_number_t hw) | |
756 | { | |
757 | if (GIC_HWIRQ_TO_LOCAL(hw) < GIC_NUM_LOCAL_INTRS) | |
758 | return gic_local_irq_domain_map(d, virq, hw); | |
759 | return gic_shared_irq_domain_map(d, virq, hw); | |
760 | } | |
761 | ||
a7057270 AB |
762 | static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr, |
763 | const u32 *intspec, unsigned int intsize, | |
764 | irq_hw_number_t *out_hwirq, | |
765 | unsigned int *out_type) | |
766 | { | |
767 | if (intsize != 3) | |
768 | return -EINVAL; | |
769 | ||
770 | if (intspec[0] == GIC_SHARED) | |
771 | *out_hwirq = GIC_SHARED_TO_HWIRQ(intspec[1]); | |
772 | else if (intspec[0] == GIC_LOCAL) | |
773 | *out_hwirq = GIC_LOCAL_TO_HWIRQ(intspec[1]); | |
774 | else | |
775 | return -EINVAL; | |
776 | *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK; | |
777 | ||
778 | return 0; | |
779 | } | |
780 | ||
96009736 | 781 | static const struct irq_domain_ops gic_irq_domain_ops = { |
c49581a4 | 782 | .map = gic_irq_domain_map, |
a7057270 | 783 | .xlate = gic_irq_domain_xlate, |
c49581a4 AB |
784 | }; |
785 | ||
a7057270 AB |
786 | static void __init __gic_init(unsigned long gic_base_addr, |
787 | unsigned long gic_addrspace_size, | |
788 | unsigned int cpu_vec, unsigned int irqbase, | |
789 | struct device_node *node) | |
39b8d525 RB |
790 | { |
791 | unsigned int gicconfig; | |
792 | ||
5f68fea0 | 793 | gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size); |
39b8d525 | 794 | |
5f68fea0 | 795 | gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); |
fbd55241 | 796 | gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >> |
39b8d525 | 797 | GIC_SH_CONFIG_NUMINTRS_SHF; |
fbd55241 | 798 | gic_shared_intrs = ((gic_shared_intrs + 1) * 8); |
39b8d525 | 799 | |
e9de688d | 800 | gic_vpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >> |
39b8d525 | 801 | GIC_SH_CONFIG_NUMVPES_SHF; |
e9de688d | 802 | gic_vpes = gic_vpes + 1; |
39b8d525 | 803 | |
18743d27 AB |
804 | if (cpu_has_veic) { |
805 | /* Always use vector 1 in EIC mode */ | |
806 | gic_cpu_pin = 0; | |
1b6af71a | 807 | timer_cpu_pin = gic_cpu_pin; |
18743d27 AB |
808 | set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET, |
809 | __gic_irq_dispatch); | |
810 | } else { | |
811 | gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET; | |
812 | irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec, | |
813 | gic_irq_dispatch); | |
1b6af71a JH |
814 | /* |
815 | * With the CMP implementation of SMP (deprecated), other CPUs | |
816 | * are started by the bootloader and put into a timer based | |
817 | * waiting poll loop. We must not re-route those CPU's local | |
818 | * timer interrupts as the wait instruction will never finish, | |
819 | * so just handle whatever CPU interrupt it is routed to by | |
820 | * default. | |
821 | * | |
822 | * This workaround should be removed when CMP support is | |
823 | * dropped. | |
824 | */ | |
825 | if (IS_ENABLED(CONFIG_MIPS_CMP) && | |
826 | gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) { | |
c3f57f02 | 827 | timer_cpu_pin = gic_read32(GIC_REG(VPE_LOCAL, |
1b6af71a JH |
828 | GIC_VPE_TIMER_MAP)) & |
829 | GIC_MAP_MSK; | |
830 | irq_set_chained_handler(MIPS_CPU_IRQ_BASE + | |
831 | GIC_CPU_PIN_OFFSET + | |
832 | timer_cpu_pin, | |
833 | gic_irq_dispatch); | |
834 | } else { | |
835 | timer_cpu_pin = gic_cpu_pin; | |
836 | } | |
18743d27 AB |
837 | } |
838 | ||
a7057270 | 839 | gic_irq_domain = irq_domain_add_simple(node, GIC_NUM_LOCAL_INTRS + |
e9de688d | 840 | gic_shared_intrs, irqbase, |
c49581a4 AB |
841 | &gic_irq_domain_ops, NULL); |
842 | if (!gic_irq_domain) | |
843 | panic("Failed to add GIC IRQ domain"); | |
0b271f56 | 844 | |
e9de688d | 845 | gic_basic_init(); |
18743d27 AB |
846 | |
847 | gic_ipi_init(); | |
39b8d525 | 848 | } |
a7057270 AB |
849 | |
850 | void __init gic_init(unsigned long gic_base_addr, | |
851 | unsigned long gic_addrspace_size, | |
852 | unsigned int cpu_vec, unsigned int irqbase) | |
853 | { | |
854 | __gic_init(gic_base_addr, gic_addrspace_size, cpu_vec, irqbase, NULL); | |
855 | } | |
856 | ||
857 | static int __init gic_of_init(struct device_node *node, | |
858 | struct device_node *parent) | |
859 | { | |
860 | struct resource res; | |
861 | unsigned int cpu_vec, i = 0, reserved = 0; | |
862 | phys_addr_t gic_base; | |
863 | size_t gic_len; | |
864 | ||
865 | /* Find the first available CPU vector. */ | |
866 | while (!of_property_read_u32_index(node, "mti,reserved-cpu-vectors", | |
867 | i++, &cpu_vec)) | |
868 | reserved |= BIT(cpu_vec); | |
869 | for (cpu_vec = 2; cpu_vec < 8; cpu_vec++) { | |
870 | if (!(reserved & BIT(cpu_vec))) | |
871 | break; | |
872 | } | |
873 | if (cpu_vec == 8) { | |
874 | pr_err("No CPU vectors available for GIC\n"); | |
875 | return -ENODEV; | |
876 | } | |
877 | ||
878 | if (of_address_to_resource(node, 0, &res)) { | |
879 | /* | |
880 | * Probe the CM for the GIC base address if not specified | |
881 | * in the device-tree. | |
882 | */ | |
883 | if (mips_cm_present()) { | |
884 | gic_base = read_gcr_gic_base() & | |
885 | ~CM_GCR_GIC_BASE_GICEN_MSK; | |
886 | gic_len = 0x20000; | |
887 | } else { | |
888 | pr_err("Failed to get GIC memory range\n"); | |
889 | return -ENODEV; | |
890 | } | |
891 | } else { | |
892 | gic_base = res.start; | |
893 | gic_len = resource_size(&res); | |
894 | } | |
895 | ||
896 | if (mips_cm_present()) | |
897 | write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN_MSK); | |
898 | gic_present = true; | |
899 | ||
900 | __gic_init(gic_base, gic_len, cpu_vec, 0, node); | |
901 | ||
902 | return 0; | |
903 | } | |
904 | IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init); |