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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
4 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
5 */
6
7#include <linux/kernel.h>
8#include <linux/errno.h>
9#include <linux/mutex.h>
10#include <linux/of.h>
11#include <linux/of_platform.h>
12#include <linux/interrupt.h>
13#include <linux/of_device.h>
14#include <linux/clocksource.h>
15#include <linux/clockchips.h>
16
17#include <asm/oplib.h>
18#include <asm/timer.h>
19#include <asm/prom.h>
20#include <asm/leon.h>
21#include <asm/leon_amba.h>
22#include <asm/traps.h>
23#include <asm/cacheflush.h>
24#include <asm/smp.h>
25#include <asm/setup.h>
26
27#include "kernel.h"
28#include "prom.h"
29#include "irq.h"
30
31struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
32struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
33
34int leondebug_irq_disable;
35int leon_debug_irqout;
36static volatile u32 dummy_master_l10_counter;
37unsigned long amba_system_id;
38static DEFINE_SPINLOCK(leon_irq_lock);
39
40static unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
41static unsigned long leon3_gptimer_ackmask; /* For clearing pending bit */
42unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
43unsigned int sparc_leon_eirq;
44#define LEON_IMASK(cpu) (&leon3_irqctrl_regs->mask[cpu])
45#define LEON_IACK (&leon3_irqctrl_regs->iclear)
46#define LEON_DO_ACK_HW 1
47
48/* Return the last ACKed IRQ by the Extended IRQ controller. It has already
49 * been (automatically) ACKed when the CPU takes the trap.
50 */
51static inline unsigned int leon_eirq_get(int cpu)
52{
53 return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
54}
55
56/* Handle one or multiple IRQs from the extended interrupt controller */
57static void leon_handle_ext_irq(struct irq_desc *desc)
58{
59 unsigned int eirq;
60 struct irq_bucket *p;
61 int cpu = sparc_leon3_cpuid();
62
63 eirq = leon_eirq_get(cpu);
64 p = irq_map[eirq];
65 if ((eirq & 0x10) && p && p->irq) /* bit4 tells if IRQ happened */
66 generic_handle_irq(p->irq);
67}
68
69/* The extended IRQ controller has been found, this function registers it */
70static void leon_eirq_setup(unsigned int eirq)
71{
72 unsigned long mask, oldmask;
73 unsigned int veirq;
74
75 if (eirq < 1 || eirq > 0xf) {
76 printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);
77 return;
78 }
79
80 veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0);
81
82 /*
83 * Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ
84 * controller have a mask-bit of their own, so this is safe.
85 */
86 irq_link(veirq);
87 mask = 1 << eirq;
88 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id));
89 LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask | mask));
90 sparc_leon_eirq = eirq;
91}
92
93unsigned long leon_get_irqmask(unsigned int irq)
94{
95 unsigned long mask;
96
97 if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
98 || ((irq > 0x1f) && sparc_leon_eirq)) {
99 printk(KERN_ERR
100 "leon_get_irqmask: false irq number: %d\n", irq);
101 mask = 0;
102 } else {
103 mask = LEON_HARD_INT(irq);
104 }
105 return mask;
106}
107
108#ifdef CONFIG_SMP
109static int irq_choose_cpu(const struct cpumask *affinity)
110{
111 cpumask_t mask;
112
113 cpumask_and(&mask, cpu_online_mask, affinity);
114 if (cpumask_equal(&mask, cpu_online_mask) || cpumask_empty(&mask))
115 return boot_cpu_id;
116 else
117 return cpumask_first(&mask);
118}
119#else
120#define irq_choose_cpu(affinity) boot_cpu_id
121#endif
122
123static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest,
124 bool force)
125{
126 unsigned long mask, oldmask, flags;
127 int oldcpu, newcpu;
128
129 mask = (unsigned long)data->chip_data;
130 oldcpu = irq_choose_cpu(irq_data_get_affinity_mask(data));
131 newcpu = irq_choose_cpu(dest);
132
133 if (oldcpu == newcpu)
134 goto out;
135
136 /* unmask on old CPU first before enabling on the selected CPU */
137 spin_lock_irqsave(&leon_irq_lock, flags);
138 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(oldcpu));
139 LEON3_BYPASS_STORE_PA(LEON_IMASK(oldcpu), (oldmask & ~mask));
140 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(newcpu));
141 LEON3_BYPASS_STORE_PA(LEON_IMASK(newcpu), (oldmask | mask));
142 spin_unlock_irqrestore(&leon_irq_lock, flags);
143out:
144 return IRQ_SET_MASK_OK;
145}
146
147static void leon_unmask_irq(struct irq_data *data)
148{
149 unsigned long mask, oldmask, flags;
150 int cpu;
151
152 mask = (unsigned long)data->chip_data;
153 cpu = irq_choose_cpu(irq_data_get_affinity_mask(data));
154 spin_lock_irqsave(&leon_irq_lock, flags);
155 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
156 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask | mask));
157 spin_unlock_irqrestore(&leon_irq_lock, flags);
158}
159
160static void leon_mask_irq(struct irq_data *data)
161{
162 unsigned long mask, oldmask, flags;
163 int cpu;
164
165 mask = (unsigned long)data->chip_data;
166 cpu = irq_choose_cpu(irq_data_get_affinity_mask(data));
167 spin_lock_irqsave(&leon_irq_lock, flags);
168 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
169 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask & ~mask));
170 spin_unlock_irqrestore(&leon_irq_lock, flags);
171}
172
173static unsigned int leon_startup_irq(struct irq_data *data)
174{
175 irq_link(data->irq);
176 leon_unmask_irq(data);
177 return 0;
178}
179
180static void leon_shutdown_irq(struct irq_data *data)
181{
182 leon_mask_irq(data);
183 irq_unlink(data->irq);
184}
185
186/* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */
187static void leon_eoi_irq(struct irq_data *data)
188{
189 unsigned long mask = (unsigned long)data->chip_data;
190
191 if (mask & LEON_DO_ACK_HW)
192 LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);
193}
194
195static struct irq_chip leon_irq = {
196 .name = "leon",
197 .irq_startup = leon_startup_irq,
198 .irq_shutdown = leon_shutdown_irq,
199 .irq_mask = leon_mask_irq,
200 .irq_unmask = leon_unmask_irq,
201 .irq_eoi = leon_eoi_irq,
202 .irq_set_affinity = leon_set_affinity,
203};
204
205/*
206 * Build a LEON IRQ for the edge triggered LEON IRQ controller:
207 * Edge (normal) IRQ - handle_simple_irq, ack=DON'T-CARE, never ack
208 * Level IRQ (PCI|Level-GPIO) - handle_fasteoi_irq, ack=1, ack after ISR
209 * Per-CPU Edge - handle_percpu_irq, ack=0
210 */
211unsigned int leon_build_device_irq(unsigned int real_irq,
212 irq_flow_handler_t flow_handler,
213 const char *name, int do_ack)
214{
215 unsigned int irq;
216 unsigned long mask;
217 struct irq_desc *desc;
218
219 irq = 0;
220 mask = leon_get_irqmask(real_irq);
221 if (mask == 0)
222 goto out;
223
224 irq = irq_alloc(real_irq, real_irq);
225 if (irq == 0)
226 goto out;
227
228 if (do_ack)
229 mask |= LEON_DO_ACK_HW;
230
231 desc = irq_to_desc(irq);
232 if (!desc || !desc->handle_irq || desc->handle_irq == handle_bad_irq) {
233 irq_set_chip_and_handler_name(irq, &leon_irq,
234 flow_handler, name);
235 irq_set_chip_data(irq, (void *)mask);
236 }
237
238out:
239 return irq;
240}
241
242static unsigned int _leon_build_device_irq(struct platform_device *op,
243 unsigned int real_irq)
244{
245 return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);
246}
247
248void leon_update_virq_handling(unsigned int virq,
249 irq_flow_handler_t flow_handler,
250 const char *name, int do_ack)
251{
252 unsigned long mask = (unsigned long)irq_get_chip_data(virq);
253
254 mask &= ~LEON_DO_ACK_HW;
255 if (do_ack)
256 mask |= LEON_DO_ACK_HW;
257
258 irq_set_chip_and_handler_name(virq, &leon_irq,
259 flow_handler, name);
260 irq_set_chip_data(virq, (void *)mask);
261}
262
263static u32 leon_cycles_offset(void)
264{
265 u32 rld, val, ctrl, off;
266
267 rld = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld);
268 val = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val);
269 ctrl = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl);
270 if (LEON3_GPTIMER_CTRL_ISPENDING(ctrl)) {
271 val = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val);
272 off = 2 * rld - val;
273 } else {
274 off = rld - val;
275 }
276
277 return off;
278}
279
280#ifdef CONFIG_SMP
281
282/* smp clockevent irq */
283static irqreturn_t leon_percpu_timer_ce_interrupt(int irq, void *unused)
284{
285 struct clock_event_device *ce;
286 int cpu = smp_processor_id();
287
288 leon_clear_profile_irq(cpu);
289
290 if (cpu == boot_cpu_id)
291 timer_interrupt(irq, NULL);
292
293 ce = &per_cpu(sparc32_clockevent, cpu);
294
295 irq_enter();
296 if (ce->event_handler)
297 ce->event_handler(ce);
298 irq_exit();
299
300 return IRQ_HANDLED;
301}
302
303#endif /* CONFIG_SMP */
304
305void __init leon_init_timers(void)
306{
307 int irq, eirq;
308 struct device_node *rootnp, *np, *nnp;
309 struct property *pp;
310 int len;
311 int icsel;
312 int ampopts;
313 int err;
314 u32 config;
315 u32 ctrl;
316
317 sparc_config.get_cycles_offset = leon_cycles_offset;
318 sparc_config.cs_period = 1000000 / HZ;
319 sparc_config.features |= FEAT_L10_CLOCKSOURCE;
320
321#ifndef CONFIG_SMP
322 sparc_config.features |= FEAT_L10_CLOCKEVENT;
323#endif
324
325 leondebug_irq_disable = 0;
326 leon_debug_irqout = 0;
327 master_l10_counter = (u32 __iomem *)&dummy_master_l10_counter;
328 dummy_master_l10_counter = 0;
329
330 rootnp = of_find_node_by_path("/ambapp0");
331 if (!rootnp)
332 goto bad;
333
334 /* Find System ID: GRLIB build ID and optional CHIP ID */
335 pp = of_find_property(rootnp, "systemid", &len);
336 if (pp)
337 amba_system_id = *(unsigned long *)pp->value;
338
339 /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
340 np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
341 if (!np) {
342 np = of_find_node_by_name(rootnp, "01_00d");
343 if (!np)
344 goto bad;
345 }
346 pp = of_find_property(np, "reg", &len);
347 if (!pp)
348 goto bad;
349 leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
350
351 /* Find GPTIMER Timer Registers base address otherwise bail out. */
352 nnp = rootnp;
353
354retry:
355 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
356 if (!np) {
357 np = of_find_node_by_name(nnp, "01_011");
358 if (!np)
359 goto bad;
360 }
361
362 ampopts = 0;
363 pp = of_find_property(np, "ampopts", &len);
364 if (pp) {
365 ampopts = *(int *)pp->value;
366 if (ampopts == 0) {
367 /* Skip this instance, resource already
368 * allocated by other OS */
369 nnp = np;
370 goto retry;
371 }
372 }
373
374 /* Select Timer-Instance on Timer Core. Default is zero */
375 leon3_gptimer_idx = ampopts & 0x7;
376
377 pp = of_find_property(np, "reg", &len);
378 if (pp)
379 leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
380 pp->value;
381 pp = of_find_property(np, "interrupts", &len);
382 if (pp)
383 leon3_gptimer_irq = *(unsigned int *)pp->value;
384
385 if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
386 goto bad;
387
388 ctrl = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl);
389 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
390 ctrl | LEON3_GPTIMER_CTRL_PENDING);
391 ctrl = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl);
392
393 if ((ctrl & LEON3_GPTIMER_CTRL_PENDING) != 0)
394 leon3_gptimer_ackmask = ~LEON3_GPTIMER_CTRL_PENDING;
395 else
396 leon3_gptimer_ackmask = ~0;
397
398 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
399 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
400 (((1000000 / HZ) - 1)));
401 LEON3_BYPASS_STORE_PA(
402 &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
403
404 /*
405 * The IRQ controller may (if implemented) consist of multiple
406 * IRQ controllers, each mapped on a 4Kb boundary.
407 * Each CPU may be routed to different IRQCTRLs, however
408 * we assume that all CPUs (in SMP system) is routed to the
409 * same IRQ Controller, and for non-SMP only one IRQCTRL is
410 * accessed anyway.
411 * In AMP systems, Linux must run on CPU0 for the time being.
412 */
413 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]);
414 icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf;
415 leon3_irqctrl_regs += icsel;
416
417 /* Mask all IRQs on boot-cpu IRQ controller */
418 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0);
419
420 /* Probe extended IRQ controller */
421 eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
422 >> 16) & 0xf;
423 if (eirq != 0)
424 leon_eirq_setup(eirq);
425
426#ifdef CONFIG_SMP
427 {
428 unsigned long flags;
429
430 /*
431 * In SMP, sun4m adds a IPI handler to IRQ trap handler that
432 * LEON never must take, sun4d and LEON overwrites the branch
433 * with a NOP.
434 */
435 local_irq_save(flags);
436 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
437 local_ops->cache_all();
438 local_irq_restore(flags);
439 }
440#endif
441
442 config = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config);
443 if (config & (1 << LEON3_GPTIMER_SEPIRQ))
444 leon3_gptimer_irq += leon3_gptimer_idx;
445 else if ((config & LEON3_GPTIMER_TIMERS) > 1)
446 pr_warn("GPTIMER uses shared irqs, using other timers of the same core will fail.\n");
447
448#ifdef CONFIG_SMP
449 /* Install per-cpu IRQ handler for broadcasted ticker */
450 irq = leon_build_device_irq(leon3_gptimer_irq, handle_percpu_irq,
451 "per-cpu", 0);
452 err = request_irq(irq, leon_percpu_timer_ce_interrupt,
453 IRQF_PERCPU | IRQF_TIMER, "timer", NULL);
454#else
455 irq = _leon_build_device_irq(NULL, leon3_gptimer_irq);
456 err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL);
457#endif
458 if (err) {
459 pr_err("Unable to attach timer IRQ%d\n", irq);
460 prom_halt();
461 }
462 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
463 LEON3_GPTIMER_EN |
464 LEON3_GPTIMER_RL |
465 LEON3_GPTIMER_LD |
466 LEON3_GPTIMER_IRQEN);
467 return;
468bad:
469 printk(KERN_ERR "No Timer/irqctrl found\n");
470 BUG();
471 return;
472}
473
474static void leon_clear_clock_irq(void)
475{
476 u32 ctrl;
477
478 ctrl = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl);
479 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
480 ctrl & leon3_gptimer_ackmask);
481}
482
483static void leon_load_profile_irq(int cpu, unsigned int limit)
484{
485}
486
487void __init leon_trans_init(struct device_node *dp)
488{
489 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
490 struct property *p;
491 p = of_find_property(dp, "mid", (void *)0);
492 if (p) {
493 int mid;
494 dp->name = prom_early_alloc(5 + 1);
495 memcpy(&mid, p->value, p->length);
496 sprintf((char *)dp->name, "cpu%.2d", mid);
497 }
498 }
499}
500
501#ifdef CONFIG_SMP
502void leon_clear_profile_irq(int cpu)
503{
504}
505
506void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
507{
508 unsigned long mask, flags, *addr;
509 mask = leon_get_irqmask(irq_nr);
510 spin_lock_irqsave(&leon_irq_lock, flags);
511 addr = (unsigned long *)LEON_IMASK(cpu);
512 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));
513 spin_unlock_irqrestore(&leon_irq_lock, flags);
514}
515
516#endif
517
518void __init leon_init_IRQ(void)
519{
520 sparc_config.init_timers = leon_init_timers;
521 sparc_config.build_device_irq = _leon_build_device_irq;
522 sparc_config.clock_rate = 1000000;
523 sparc_config.clear_clock_irq = leon_clear_clock_irq;
524 sparc_config.load_profile_irq = leon_load_profile_irq;
525}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
4 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
5 */
6
7#include <linux/kernel.h>
8#include <linux/errno.h>
9#include <linux/mutex.h>
10#include <linux/of.h>
11#include <linux/interrupt.h>
12#include <linux/clocksource.h>
13#include <linux/clockchips.h>
14
15#include <asm/oplib.h>
16#include <asm/timer.h>
17#include <asm/prom.h>
18#include <asm/leon.h>
19#include <asm/leon_amba.h>
20#include <asm/traps.h>
21#include <asm/cacheflush.h>
22#include <asm/smp.h>
23#include <asm/setup.h>
24
25#include "kernel.h"
26#include "prom.h"
27#include "irq.h"
28
29struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
30struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
31
32int leondebug_irq_disable;
33int leon_debug_irqout;
34static volatile u32 dummy_master_l10_counter;
35unsigned long amba_system_id;
36static DEFINE_SPINLOCK(leon_irq_lock);
37
38static unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
39static unsigned long leon3_gptimer_ackmask; /* For clearing pending bit */
40unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
41unsigned int sparc_leon_eirq;
42#define LEON_IMASK(cpu) (&leon3_irqctrl_regs->mask[cpu])
43#define LEON_IACK (&leon3_irqctrl_regs->iclear)
44#define LEON_DO_ACK_HW 1
45
46/* Return the last ACKed IRQ by the Extended IRQ controller. It has already
47 * been (automatically) ACKed when the CPU takes the trap.
48 */
49static inline unsigned int leon_eirq_get(int cpu)
50{
51 return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
52}
53
54/* Handle one or multiple IRQs from the extended interrupt controller */
55static void leon_handle_ext_irq(struct irq_desc *desc)
56{
57 unsigned int eirq;
58 struct irq_bucket *p;
59 int cpu = sparc_leon3_cpuid();
60
61 eirq = leon_eirq_get(cpu);
62 p = irq_map[eirq];
63 if ((eirq & 0x10) && p && p->irq) /* bit4 tells if IRQ happened */
64 generic_handle_irq(p->irq);
65}
66
67/* The extended IRQ controller has been found, this function registers it */
68static void leon_eirq_setup(unsigned int eirq)
69{
70 unsigned long mask, oldmask;
71 unsigned int veirq;
72
73 if (eirq < 1 || eirq > 0xf) {
74 printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);
75 return;
76 }
77
78 veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0);
79
80 /*
81 * Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ
82 * controller have a mask-bit of their own, so this is safe.
83 */
84 irq_link(veirq);
85 mask = 1 << eirq;
86 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id));
87 LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask | mask));
88 sparc_leon_eirq = eirq;
89}
90
91unsigned long leon_get_irqmask(unsigned int irq)
92{
93 unsigned long mask;
94
95 if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
96 || ((irq > 0x1f) && sparc_leon_eirq)) {
97 printk(KERN_ERR
98 "leon_get_irqmask: false irq number: %d\n", irq);
99 mask = 0;
100 } else {
101 mask = LEON_HARD_INT(irq);
102 }
103 return mask;
104}
105
106#ifdef CONFIG_SMP
107static int irq_choose_cpu(const struct cpumask *affinity)
108{
109 unsigned int cpu = cpumask_first_and(affinity, cpu_online_mask);
110
111 if (cpumask_subset(cpu_online_mask, affinity) || cpu >= nr_cpu_ids)
112 return boot_cpu_id;
113 else
114 return cpu;
115}
116#else
117#define irq_choose_cpu(affinity) boot_cpu_id
118#endif
119
120static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest,
121 bool force)
122{
123 unsigned long mask, oldmask, flags;
124 int oldcpu, newcpu;
125
126 mask = (unsigned long)data->chip_data;
127 oldcpu = irq_choose_cpu(irq_data_get_affinity_mask(data));
128 newcpu = irq_choose_cpu(dest);
129
130 if (oldcpu == newcpu)
131 goto out;
132
133 /* unmask on old CPU first before enabling on the selected CPU */
134 spin_lock_irqsave(&leon_irq_lock, flags);
135 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(oldcpu));
136 LEON3_BYPASS_STORE_PA(LEON_IMASK(oldcpu), (oldmask & ~mask));
137 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(newcpu));
138 LEON3_BYPASS_STORE_PA(LEON_IMASK(newcpu), (oldmask | mask));
139 spin_unlock_irqrestore(&leon_irq_lock, flags);
140out:
141 return IRQ_SET_MASK_OK;
142}
143
144static void leon_unmask_irq(struct irq_data *data)
145{
146 unsigned long mask, oldmask, flags;
147 int cpu;
148
149 mask = (unsigned long)data->chip_data;
150 cpu = irq_choose_cpu(irq_data_get_affinity_mask(data));
151 spin_lock_irqsave(&leon_irq_lock, flags);
152 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
153 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask | mask));
154 spin_unlock_irqrestore(&leon_irq_lock, flags);
155}
156
157static void leon_mask_irq(struct irq_data *data)
158{
159 unsigned long mask, oldmask, flags;
160 int cpu;
161
162 mask = (unsigned long)data->chip_data;
163 cpu = irq_choose_cpu(irq_data_get_affinity_mask(data));
164 spin_lock_irqsave(&leon_irq_lock, flags);
165 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
166 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask & ~mask));
167 spin_unlock_irqrestore(&leon_irq_lock, flags);
168}
169
170static unsigned int leon_startup_irq(struct irq_data *data)
171{
172 irq_link(data->irq);
173 leon_unmask_irq(data);
174 return 0;
175}
176
177static void leon_shutdown_irq(struct irq_data *data)
178{
179 leon_mask_irq(data);
180 irq_unlink(data->irq);
181}
182
183/* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */
184static void leon_eoi_irq(struct irq_data *data)
185{
186 unsigned long mask = (unsigned long)data->chip_data;
187
188 if (mask & LEON_DO_ACK_HW)
189 LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);
190}
191
192static struct irq_chip leon_irq = {
193 .name = "leon",
194 .irq_startup = leon_startup_irq,
195 .irq_shutdown = leon_shutdown_irq,
196 .irq_mask = leon_mask_irq,
197 .irq_unmask = leon_unmask_irq,
198 .irq_eoi = leon_eoi_irq,
199 .irq_set_affinity = leon_set_affinity,
200};
201
202/*
203 * Build a LEON IRQ for the edge triggered LEON IRQ controller:
204 * Edge (normal) IRQ - handle_simple_irq, ack=DON'T-CARE, never ack
205 * Level IRQ (PCI|Level-GPIO) - handle_fasteoi_irq, ack=1, ack after ISR
206 * Per-CPU Edge - handle_percpu_irq, ack=0
207 */
208unsigned int leon_build_device_irq(unsigned int real_irq,
209 irq_flow_handler_t flow_handler,
210 const char *name, int do_ack)
211{
212 unsigned int irq;
213 unsigned long mask;
214 struct irq_desc *desc;
215
216 irq = 0;
217 mask = leon_get_irqmask(real_irq);
218 if (mask == 0)
219 goto out;
220
221 irq = irq_alloc(real_irq, real_irq);
222 if (irq == 0)
223 goto out;
224
225 if (do_ack)
226 mask |= LEON_DO_ACK_HW;
227
228 desc = irq_to_desc(irq);
229 if (!desc || !desc->handle_irq || desc->handle_irq == handle_bad_irq) {
230 irq_set_chip_and_handler_name(irq, &leon_irq,
231 flow_handler, name);
232 irq_set_chip_data(irq, (void *)mask);
233 }
234
235out:
236 return irq;
237}
238
239static unsigned int _leon_build_device_irq(struct platform_device *op,
240 unsigned int real_irq)
241{
242 return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);
243}
244
245void leon_update_virq_handling(unsigned int virq,
246 irq_flow_handler_t flow_handler,
247 const char *name, int do_ack)
248{
249 unsigned long mask = (unsigned long)irq_get_chip_data(virq);
250
251 mask &= ~LEON_DO_ACK_HW;
252 if (do_ack)
253 mask |= LEON_DO_ACK_HW;
254
255 irq_set_chip_and_handler_name(virq, &leon_irq,
256 flow_handler, name);
257 irq_set_chip_data(virq, (void *)mask);
258}
259
260static u32 leon_cycles_offset(void)
261{
262 u32 rld, val, ctrl, off;
263
264 rld = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld);
265 val = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val);
266 ctrl = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl);
267 if (LEON3_GPTIMER_CTRL_ISPENDING(ctrl)) {
268 val = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val);
269 off = 2 * rld - val;
270 } else {
271 off = rld - val;
272 }
273
274 return off;
275}
276
277#ifdef CONFIG_SMP
278
279/* smp clockevent irq */
280static irqreturn_t leon_percpu_timer_ce_interrupt(int irq, void *unused)
281{
282 struct clock_event_device *ce;
283 int cpu = smp_processor_id();
284
285 leon_clear_profile_irq(cpu);
286
287 if (cpu == boot_cpu_id)
288 timer_interrupt(irq, NULL);
289
290 ce = &per_cpu(sparc32_clockevent, cpu);
291
292 irq_enter();
293 if (ce->event_handler)
294 ce->event_handler(ce);
295 irq_exit();
296
297 return IRQ_HANDLED;
298}
299
300#endif /* CONFIG_SMP */
301
302void __init leon_init_timers(void)
303{
304 int irq, eirq;
305 struct device_node *rootnp, *np, *nnp;
306 struct property *pp;
307 int len;
308 int icsel;
309 int ampopts;
310 int err;
311 u32 config;
312 u32 ctrl;
313
314 sparc_config.get_cycles_offset = leon_cycles_offset;
315 sparc_config.cs_period = 1000000 / HZ;
316 sparc_config.features |= FEAT_L10_CLOCKSOURCE;
317
318#ifndef CONFIG_SMP
319 sparc_config.features |= FEAT_L10_CLOCKEVENT;
320#endif
321
322 leondebug_irq_disable = 0;
323 leon_debug_irqout = 0;
324 master_l10_counter = (u32 __iomem *)&dummy_master_l10_counter;
325 dummy_master_l10_counter = 0;
326
327 rootnp = of_find_node_by_path("/ambapp0");
328 if (!rootnp)
329 goto bad;
330
331 /* Find System ID: GRLIB build ID and optional CHIP ID */
332 pp = of_find_property(rootnp, "systemid", &len);
333 if (pp)
334 amba_system_id = *(unsigned long *)pp->value;
335
336 /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
337 np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
338 if (!np) {
339 np = of_find_node_by_name(rootnp, "01_00d");
340 if (!np)
341 goto bad;
342 }
343 pp = of_find_property(np, "reg", &len);
344 if (!pp)
345 goto bad;
346 leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
347
348 /* Find GPTIMER Timer Registers base address otherwise bail out. */
349 nnp = rootnp;
350
351retry:
352 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
353 if (!np) {
354 np = of_find_node_by_name(nnp, "01_011");
355 if (!np)
356 goto bad;
357 }
358
359 ampopts = 0;
360 pp = of_find_property(np, "ampopts", &len);
361 if (pp) {
362 ampopts = *(int *)pp->value;
363 if (ampopts == 0) {
364 /* Skip this instance, resource already
365 * allocated by other OS */
366 nnp = np;
367 goto retry;
368 }
369 }
370
371 /* Select Timer-Instance on Timer Core. Default is zero */
372 leon3_gptimer_idx = ampopts & 0x7;
373
374 pp = of_find_property(np, "reg", &len);
375 if (pp)
376 leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
377 pp->value;
378 pp = of_find_property(np, "interrupts", &len);
379 if (pp)
380 leon3_gptimer_irq = *(unsigned int *)pp->value;
381
382 if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
383 goto bad;
384
385 ctrl = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl);
386 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
387 ctrl | LEON3_GPTIMER_CTRL_PENDING);
388 ctrl = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl);
389
390 if ((ctrl & LEON3_GPTIMER_CTRL_PENDING) != 0)
391 leon3_gptimer_ackmask = ~LEON3_GPTIMER_CTRL_PENDING;
392 else
393 leon3_gptimer_ackmask = ~0;
394
395 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
396 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
397 (((1000000 / HZ) - 1)));
398 LEON3_BYPASS_STORE_PA(
399 &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
400
401 /*
402 * The IRQ controller may (if implemented) consist of multiple
403 * IRQ controllers, each mapped on a 4Kb boundary.
404 * Each CPU may be routed to different IRQCTRLs, however
405 * we assume that all CPUs (in SMP system) is routed to the
406 * same IRQ Controller, and for non-SMP only one IRQCTRL is
407 * accessed anyway.
408 * In AMP systems, Linux must run on CPU0 for the time being.
409 */
410 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]);
411 icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf;
412 leon3_irqctrl_regs += icsel;
413
414 /* Mask all IRQs on boot-cpu IRQ controller */
415 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0);
416
417 /* Probe extended IRQ controller */
418 eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
419 >> 16) & 0xf;
420 if (eirq != 0)
421 leon_eirq_setup(eirq);
422
423#ifdef CONFIG_SMP
424 {
425 unsigned long flags;
426
427 /*
428 * In SMP, sun4m adds a IPI handler to IRQ trap handler that
429 * LEON never must take, sun4d and LEON overwrites the branch
430 * with a NOP.
431 */
432 local_irq_save(flags);
433 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
434 local_ops->cache_all();
435 local_irq_restore(flags);
436 }
437#endif
438
439 config = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config);
440 if (config & (1 << LEON3_GPTIMER_SEPIRQ))
441 leon3_gptimer_irq += leon3_gptimer_idx;
442 else if ((config & LEON3_GPTIMER_TIMERS) > 1)
443 pr_warn("GPTIMER uses shared irqs, using other timers of the same core will fail.\n");
444
445#ifdef CONFIG_SMP
446 /* Install per-cpu IRQ handler for broadcasted ticker */
447 irq = leon_build_device_irq(leon3_gptimer_irq, handle_percpu_irq,
448 "per-cpu", 0);
449 err = request_irq(irq, leon_percpu_timer_ce_interrupt,
450 IRQF_PERCPU | IRQF_TIMER, "timer", NULL);
451#else
452 irq = _leon_build_device_irq(NULL, leon3_gptimer_irq);
453 err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL);
454#endif
455 if (err) {
456 pr_err("Unable to attach timer IRQ%d\n", irq);
457 prom_halt();
458 }
459 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
460 LEON3_GPTIMER_EN |
461 LEON3_GPTIMER_RL |
462 LEON3_GPTIMER_LD |
463 LEON3_GPTIMER_IRQEN);
464 return;
465bad:
466 printk(KERN_ERR "No Timer/irqctrl found\n");
467 BUG();
468 return;
469}
470
471static void leon_clear_clock_irq(void)
472{
473 u32 ctrl;
474
475 ctrl = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl);
476 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
477 ctrl & leon3_gptimer_ackmask);
478}
479
480static void leon_load_profile_irq(int cpu, unsigned int limit)
481{
482}
483
484#ifdef CONFIG_SMP
485void leon_clear_profile_irq(int cpu)
486{
487}
488
489void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
490{
491 unsigned long mask, flags, *addr;
492 mask = leon_get_irqmask(irq_nr);
493 spin_lock_irqsave(&leon_irq_lock, flags);
494 addr = (unsigned long *)LEON_IMASK(cpu);
495 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));
496 spin_unlock_irqrestore(&leon_irq_lock, flags);
497}
498
499#endif
500
501void __init leon_init_IRQ(void)
502{
503 sparc_config.init_timers = leon_init_timers;
504 sparc_config.build_device_irq = _leon_build_device_irq;
505 sparc_config.clock_rate = 1000000;
506 sparc_config.clear_clock_irq = leon_clear_clock_irq;
507 sparc_config.load_profile_irq = leon_load_profile_irq;
508}