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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 */
9#include <linux/bitmap.h>
10#include <linux/init.h>
11#include <linux/smp.h>
12#include <linux/irq.h>
13#include <linux/clocksource.h>
14
15#include <asm/io.h>
16#include <asm/gic.h>
17#include <asm/setup.h>
18#include <asm/traps.h>
19#include <linux/hardirq.h>
20#include <asm-generic/bitops/find.h>
21
22unsigned int gic_frequency;
23unsigned int gic_present;
24unsigned long _gic_base;
25unsigned int gic_irq_base;
26unsigned int gic_irq_flags[GIC_NUM_INTRS];
27
28/* The index into this array is the vector # of the interrupt. */
29struct gic_shared_intr_map gic_shared_intr_map[GIC_NUM_INTRS];
30
31static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
32static struct gic_pending_regs pending_regs[NR_CPUS];
33static struct gic_intrmask_regs intrmask_regs[NR_CPUS];
34
35#if defined(CONFIG_CSRC_GIC) || defined(CONFIG_CEVT_GIC)
36cycle_t gic_read_count(void)
37{
38 unsigned int hi, hi2, lo;
39
40 do {
41 GICREAD(GIC_REG(SHARED, GIC_SH_COUNTER_63_32), hi);
42 GICREAD(GIC_REG(SHARED, GIC_SH_COUNTER_31_00), lo);
43 GICREAD(GIC_REG(SHARED, GIC_SH_COUNTER_63_32), hi2);
44 } while (hi2 != hi);
45
46 return (((cycle_t) hi) << 32) + lo;
47}
48
49void gic_write_compare(cycle_t cnt)
50{
51 GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI),
52 (int)(cnt >> 32));
53 GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO),
54 (int)(cnt & 0xffffffff));
55}
56
57cycle_t gic_read_compare(void)
58{
59 unsigned int hi, lo;
60
61 GICREAD(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI), hi);
62 GICREAD(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO), lo);
63
64 return (((cycle_t) hi) << 32) + lo;
65}
66#endif
67
68unsigned int gic_get_timer_pending(void)
69{
70 unsigned int vpe_pending;
71
72 GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), 0);
73 GICREAD(GIC_REG(VPE_OTHER, GIC_VPE_PEND), vpe_pending);
74 return (vpe_pending & GIC_VPE_PEND_TIMER_MSK);
75}
76
77void gic_bind_eic_interrupt(int irq, int set)
78{
79 /* Convert irq vector # to hw int # */
80 irq -= GIC_PIN_TO_VEC_OFFSET;
81
82 /* Set irq to use shadow set */
83 GICWRITE(GIC_REG_ADDR(VPE_LOCAL, GIC_VPE_EIC_SS(irq)), set);
84}
85
86void gic_send_ipi(unsigned int intr)
87{
88 GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), 0x80000000 | intr);
89}
90
91static void gic_eic_irq_dispatch(void)
92{
93 unsigned int cause = read_c0_cause();
94 int irq;
95
96 irq = (cause & ST0_IM) >> STATUSB_IP2;
97 if (irq == 0)
98 irq = -1;
99
100 if (irq >= 0)
101 do_IRQ(gic_irq_base + irq);
102 else
103 spurious_interrupt();
104}
105
106static void __init vpe_local_setup(unsigned int numvpes)
107{
108 unsigned long timer_intr = GIC_INT_TMR;
109 unsigned long perf_intr = GIC_INT_PERFCTR;
110 unsigned int vpe_ctl;
111 int i;
112
113 if (cpu_has_veic) {
114 /*
115 * GIC timer interrupt -> CPU HW Int X (vector X+2) ->
116 * map to pin X+2-1 (since GIC adds 1)
117 */
118 timer_intr += (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
119 /*
120 * GIC perfcnt interrupt -> CPU HW Int X (vector X+2) ->
121 * map to pin X+2-1 (since GIC adds 1)
122 */
123 perf_intr += (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
124 }
125
126 /*
127 * Setup the default performance counter timer interrupts
128 * for all VPEs
129 */
130 for (i = 0; i < numvpes; i++) {
131 GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
132
133 /* Are Interrupts locally routable? */
134 GICREAD(GIC_REG(VPE_OTHER, GIC_VPE_CTL), vpe_ctl);
135 if (vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK)
136 GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP),
137 GIC_MAP_TO_PIN_MSK | timer_intr);
138 if (cpu_has_veic) {
139 set_vi_handler(timer_intr + GIC_PIN_TO_VEC_OFFSET,
140 gic_eic_irq_dispatch);
141 gic_shared_intr_map[timer_intr + GIC_PIN_TO_VEC_OFFSET].local_intr_mask |= GIC_VPE_RMASK_TIMER_MSK;
142 }
143
144 if (vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK)
145 GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP),
146 GIC_MAP_TO_PIN_MSK | perf_intr);
147 if (cpu_has_veic) {
148 set_vi_handler(perf_intr + GIC_PIN_TO_VEC_OFFSET, gic_eic_irq_dispatch);
149 gic_shared_intr_map[perf_intr + GIC_PIN_TO_VEC_OFFSET].local_intr_mask |= GIC_VPE_RMASK_PERFCNT_MSK;
150 }
151 }
152}
153
154unsigned int gic_compare_int(void)
155{
156 unsigned int pending;
157
158 GICREAD(GIC_REG(VPE_LOCAL, GIC_VPE_PEND), pending);
159 if (pending & GIC_VPE_PEND_CMP_MSK)
160 return 1;
161 else
162 return 0;
163}
164
165unsigned int gic_get_int(void)
166{
167 unsigned int i;
168 unsigned long *pending, *intrmask, *pcpu_mask;
169 unsigned long *pending_abs, *intrmask_abs;
170
171 /* Get per-cpu bitmaps */
172 pending = pending_regs[smp_processor_id()].pending;
173 intrmask = intrmask_regs[smp_processor_id()].intrmask;
174 pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask;
175
176 pending_abs = (unsigned long *) GIC_REG_ABS_ADDR(SHARED,
177 GIC_SH_PEND_31_0_OFS);
178 intrmask_abs = (unsigned long *) GIC_REG_ABS_ADDR(SHARED,
179 GIC_SH_MASK_31_0_OFS);
180
181 for (i = 0; i < BITS_TO_LONGS(GIC_NUM_INTRS); i++) {
182 GICREAD(*pending_abs, pending[i]);
183 GICREAD(*intrmask_abs, intrmask[i]);
184 pending_abs++;
185 intrmask_abs++;
186 }
187
188 bitmap_and(pending, pending, intrmask, GIC_NUM_INTRS);
189 bitmap_and(pending, pending, pcpu_mask, GIC_NUM_INTRS);
190
191 return find_first_bit(pending, GIC_NUM_INTRS);
192}
193
194static void gic_mask_irq(struct irq_data *d)
195{
196 GIC_CLR_INTR_MASK(d->irq - gic_irq_base);
197}
198
199static void gic_unmask_irq(struct irq_data *d)
200{
201 GIC_SET_INTR_MASK(d->irq - gic_irq_base);
202}
203
204#ifdef CONFIG_SMP
205static DEFINE_SPINLOCK(gic_lock);
206
207static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
208 bool force)
209{
210 unsigned int irq = (d->irq - gic_irq_base);
211 cpumask_t tmp = CPU_MASK_NONE;
212 unsigned long flags;
213 int i;
214
215 cpumask_and(&tmp, cpumask, cpu_online_mask);
216 if (cpus_empty(tmp))
217 return -1;
218
219 /* Assumption : cpumask refers to a single CPU */
220 spin_lock_irqsave(&gic_lock, flags);
221
222 /* Re-route this IRQ */
223 GIC_SH_MAP_TO_VPE_SMASK(irq, first_cpu(tmp));
224
225 /* Update the pcpu_masks */
226 for (i = 0; i < NR_CPUS; i++)
227 clear_bit(irq, pcpu_masks[i].pcpu_mask);
228 set_bit(irq, pcpu_masks[first_cpu(tmp)].pcpu_mask);
229
230 cpumask_copy(d->affinity, cpumask);
231 spin_unlock_irqrestore(&gic_lock, flags);
232
233 return IRQ_SET_MASK_OK_NOCOPY;
234}
235#endif
236
237static struct irq_chip gic_irq_controller = {
238 .name = "MIPS GIC",
239 .irq_ack = gic_irq_ack,
240 .irq_mask = gic_mask_irq,
241 .irq_mask_ack = gic_mask_irq,
242 .irq_unmask = gic_unmask_irq,
243 .irq_eoi = gic_finish_irq,
244#ifdef CONFIG_SMP
245 .irq_set_affinity = gic_set_affinity,
246#endif
247};
248
249static void __init gic_setup_intr(unsigned int intr, unsigned int cpu,
250 unsigned int pin, unsigned int polarity, unsigned int trigtype,
251 unsigned int flags)
252{
253 struct gic_shared_intr_map *map_ptr;
254
255 /* Setup Intr to Pin mapping */
256 if (pin & GIC_MAP_TO_NMI_MSK) {
257 GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)), pin);
258 /* FIXME: hack to route NMI to all cpu's */
259 for (cpu = 0; cpu < NR_CPUS; cpu += 32) {
260 GICWRITE(GIC_REG_ADDR(SHARED,
261 GIC_SH_MAP_TO_VPE_REG_OFF(intr, cpu)),
262 0xffffffff);
263 }
264 } else {
265 GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)),
266 GIC_MAP_TO_PIN_MSK | pin);
267 /* Setup Intr to CPU mapping */
268 GIC_SH_MAP_TO_VPE_SMASK(intr, cpu);
269 if (cpu_has_veic) {
270 set_vi_handler(pin + GIC_PIN_TO_VEC_OFFSET,
271 gic_eic_irq_dispatch);
272 map_ptr = &gic_shared_intr_map[pin + GIC_PIN_TO_VEC_OFFSET];
273 if (map_ptr->num_shared_intr >= GIC_MAX_SHARED_INTR)
274 BUG();
275 map_ptr->intr_list[map_ptr->num_shared_intr++] = intr;
276 }
277 }
278
279 /* Setup Intr Polarity */
280 GIC_SET_POLARITY(intr, polarity);
281
282 /* Setup Intr Trigger Type */
283 GIC_SET_TRIGGER(intr, trigtype);
284
285 /* Init Intr Masks */
286 GIC_CLR_INTR_MASK(intr);
287 /* Initialise per-cpu Interrupt software masks */
288 if (flags & GIC_FLAG_IPI)
289 set_bit(intr, pcpu_masks[cpu].pcpu_mask);
290 if ((flags & GIC_FLAG_TRANSPARENT) && (cpu_has_veic == 0))
291 GIC_SET_INTR_MASK(intr);
292 if (trigtype == GIC_TRIG_EDGE)
293 gic_irq_flags[intr] |= GIC_TRIG_EDGE;
294}
295
296static void __init gic_basic_init(int numintrs, int numvpes,
297 struct gic_intr_map *intrmap, int mapsize)
298{
299 unsigned int i, cpu;
300 unsigned int pin_offset = 0;
301
302 board_bind_eic_interrupt = &gic_bind_eic_interrupt;
303
304 /* Setup defaults */
305 for (i = 0; i < numintrs; i++) {
306 GIC_SET_POLARITY(i, GIC_POL_POS);
307 GIC_SET_TRIGGER(i, GIC_TRIG_LEVEL);
308 GIC_CLR_INTR_MASK(i);
309 if (i < GIC_NUM_INTRS) {
310 gic_irq_flags[i] = 0;
311 gic_shared_intr_map[i].num_shared_intr = 0;
312 gic_shared_intr_map[i].local_intr_mask = 0;
313 }
314 }
315
316 /*
317 * In EIC mode, the HW_INT# is offset by (2-1). Need to subtract
318 * one because the GIC will add one (since 0=no intr).
319 */
320 if (cpu_has_veic)
321 pin_offset = (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
322
323 /* Setup specifics */
324 for (i = 0; i < mapsize; i++) {
325 cpu = intrmap[i].cpunum;
326 if (cpu == GIC_UNUSED)
327 continue;
328 if (cpu == 0 && i != 0 && intrmap[i].flags == 0)
329 continue;
330 gic_setup_intr(i,
331 intrmap[i].cpunum,
332 intrmap[i].pin + pin_offset,
333 intrmap[i].polarity,
334 intrmap[i].trigtype,
335 intrmap[i].flags);
336 }
337
338 vpe_local_setup(numvpes);
339}
340
341void __init gic_init(unsigned long gic_base_addr,
342 unsigned long gic_addrspace_size,
343 struct gic_intr_map *intr_map, unsigned int intr_map_size,
344 unsigned int irqbase)
345{
346 unsigned int gicconfig;
347 int numvpes, numintrs;
348
349 _gic_base = (unsigned long) ioremap_nocache(gic_base_addr,
350 gic_addrspace_size);
351 gic_irq_base = irqbase;
352
353 GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
354 numintrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
355 GIC_SH_CONFIG_NUMINTRS_SHF;
356 numintrs = ((numintrs + 1) * 8);
357
358 numvpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
359 GIC_SH_CONFIG_NUMVPES_SHF;
360 numvpes = numvpes + 1;
361
362 gic_basic_init(numintrs, numvpes, intr_map, intr_map_size);
363
364 gic_platform_init(numintrs, &gic_irq_controller);
365}