1 /*
2 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
3 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
4 */
5
6 #include <linux/kernel.h>
7 #include <linux/errno.h>
8 #include <linux/mutex.h>
9 #include <linux/of.h>
10 #include <linux/of_platform.h>
11 #include <linux/interrupt.h>
12 #include <linux/of_device.h>
13
14 #include <asm/oplib.h>
15 #include <asm/timer.h>
16 #include <asm/prom.h>
17 #include <asm/leon.h>
18 #include <asm/leon_amba.h>
19 #include <asm/traps.h>
20 #include <asm/cacheflush.h>
21 #include <asm/smp.h>
22 #include <asm/setup.h>
23
24 #include "prom.h"
25 #include "irq.h"
26
27 struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
28 struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
29
30 int leondebug_irq_disable;
31 int leon_debug_irqout;
32 static int dummy_master_l10_counter;
33 unsigned long amba_system_id;
34 static DEFINE_SPINLOCK(leon_irq_lock);
35
36 unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
37 unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
38 int leon3_ticker_irq; /* Timer ticker IRQ */
39 unsigned int sparc_leon_eirq;
40 #define LEON_IMASK(cpu) (&leon3_irqctrl_regs->mask[cpu])
41 #define LEON_IACK (&leon3_irqctrl_regs->iclear)
42 #define LEON_DO_ACK_HW 1
43
44 /* Return the last ACKed IRQ by the Extended IRQ controller. It has already
45 * been (automatically) ACKed when the CPU takes the trap.
46 */
leon_eirq_get(int cpu)47 static inline unsigned int leon_eirq_get(int cpu)
48 {
49 return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
50 }
51
52 /* Handle one or multiple IRQs from the extended interrupt controller */
leon_handle_ext_irq(unsigned int irq,struct irq_desc * desc)53 static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc)
54 {
55 unsigned int eirq;
56 int cpu = sparc_leon3_cpuid();
57
58 eirq = leon_eirq_get(cpu);
59 if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */
60 generic_handle_irq(irq_map[eirq]->irq);
61 }
62
63 /* The extended IRQ controller has been found, this function registers it */
leon_eirq_setup(unsigned int eirq)64 void leon_eirq_setup(unsigned int eirq)
65 {
66 unsigned long mask, oldmask;
67 unsigned int veirq;
68
69 if (eirq < 1 || eirq > 0xf) {
70 printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);
71 return;
72 }
73
74 veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0);
75
76 /*
77 * Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ
78 * controller have a mask-bit of their own, so this is safe.
79 */
80 irq_link(veirq);
81 mask = 1 << eirq;
82 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id));
83 LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask | mask));
84 sparc_leon_eirq = eirq;
85 }
86
get_irqmask(unsigned int irq)87 static inline unsigned long get_irqmask(unsigned int irq)
88 {
89 unsigned long mask;
90
91 if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
92 || ((irq > 0x1f) && sparc_leon_eirq)) {
93 printk(KERN_ERR
94 "leon_get_irqmask: false irq number: %d\n", irq);
95 mask = 0;
96 } else {
97 mask = LEON_HARD_INT(irq);
98 }
99 return mask;
100 }
101
102 #ifdef CONFIG_SMP
irq_choose_cpu(const struct cpumask * affinity)103 static int irq_choose_cpu(const struct cpumask *affinity)
104 {
105 cpumask_t mask;
106
107 cpumask_and(&mask, cpu_online_mask, affinity);
108 if (cpumask_equal(&mask, cpu_online_mask) || cpumask_empty(&mask))
109 return boot_cpu_id;
110 else
111 return cpumask_first(&mask);
112 }
113 #else
114 #define irq_choose_cpu(affinity) boot_cpu_id
115 #endif
116
leon_set_affinity(struct irq_data * data,const struct cpumask * dest,bool force)117 static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest,
118 bool force)
119 {
120 unsigned long mask, oldmask, flags;
121 int oldcpu, newcpu;
122
123 mask = (unsigned long)data->chip_data;
124 oldcpu = irq_choose_cpu(data->affinity);
125 newcpu = irq_choose_cpu(dest);
126
127 if (oldcpu == newcpu)
128 goto out;
129
130 /* unmask on old CPU first before enabling on the selected CPU */
131 spin_lock_irqsave(&leon_irq_lock, flags);
132 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(oldcpu));
133 LEON3_BYPASS_STORE_PA(LEON_IMASK(oldcpu), (oldmask & ~mask));
134 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(newcpu));
135 LEON3_BYPASS_STORE_PA(LEON_IMASK(newcpu), (oldmask | mask));
136 spin_unlock_irqrestore(&leon_irq_lock, flags);
137 out:
138 return IRQ_SET_MASK_OK;
139 }
140
leon_unmask_irq(struct irq_data * data)141 static void leon_unmask_irq(struct irq_data *data)
142 {
143 unsigned long mask, oldmask, flags;
144 int cpu;
145
146 mask = (unsigned long)data->chip_data;
147 cpu = irq_choose_cpu(data->affinity);
148 spin_lock_irqsave(&leon_irq_lock, flags);
149 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
150 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask | mask));
151 spin_unlock_irqrestore(&leon_irq_lock, flags);
152 }
153
leon_mask_irq(struct irq_data * data)154 static void leon_mask_irq(struct irq_data *data)
155 {
156 unsigned long mask, oldmask, flags;
157 int cpu;
158
159 mask = (unsigned long)data->chip_data;
160 cpu = irq_choose_cpu(data->affinity);
161 spin_lock_irqsave(&leon_irq_lock, flags);
162 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
163 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask & ~mask));
164 spin_unlock_irqrestore(&leon_irq_lock, flags);
165 }
166
leon_startup_irq(struct irq_data * data)167 static unsigned int leon_startup_irq(struct irq_data *data)
168 {
169 irq_link(data->irq);
170 leon_unmask_irq(data);
171 return 0;
172 }
173
leon_shutdown_irq(struct irq_data * data)174 static void leon_shutdown_irq(struct irq_data *data)
175 {
176 leon_mask_irq(data);
177 irq_unlink(data->irq);
178 }
179
180 /* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */
leon_eoi_irq(struct irq_data * data)181 static void leon_eoi_irq(struct irq_data *data)
182 {
183 unsigned long mask = (unsigned long)data->chip_data;
184
185 if (mask & LEON_DO_ACK_HW)
186 LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);
187 }
188
189 static struct irq_chip leon_irq = {
190 .name = "leon",
191 .irq_startup = leon_startup_irq,
192 .irq_shutdown = leon_shutdown_irq,
193 .irq_mask = leon_mask_irq,
194 .irq_unmask = leon_unmask_irq,
195 .irq_eoi = leon_eoi_irq,
196 .irq_set_affinity = leon_set_affinity,
197 };
198
199 /*
200 * Build a LEON IRQ for the edge triggered LEON IRQ controller:
201 * Edge (normal) IRQ - handle_simple_irq, ack=DONT-CARE, never ack
202 * Level IRQ (PCI|Level-GPIO) - handle_fasteoi_irq, ack=1, ack after ISR
203 * Per-CPU Edge - handle_percpu_irq, ack=0
204 */
leon_build_device_irq(unsigned int real_irq,irq_flow_handler_t flow_handler,const char * name,int do_ack)205 unsigned int leon_build_device_irq(unsigned int real_irq,
206 irq_flow_handler_t flow_handler,
207 const char *name, int do_ack)
208 {
209 unsigned int irq;
210 unsigned long mask;
211
212 irq = 0;
213 mask = get_irqmask(real_irq);
214 if (mask == 0)
215 goto out;
216
217 irq = irq_alloc(real_irq, real_irq);
218 if (irq == 0)
219 goto out;
220
221 if (do_ack)
222 mask |= LEON_DO_ACK_HW;
223
224 irq_set_chip_and_handler_name(irq, &leon_irq,
225 flow_handler, name);
226 irq_set_chip_data(irq, (void *)mask);
227
228 out:
229 return irq;
230 }
231
_leon_build_device_irq(struct platform_device * op,unsigned int real_irq)232 static unsigned int _leon_build_device_irq(struct platform_device *op,
233 unsigned int real_irq)
234 {
235 return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);
236 }
237
leon_update_virq_handling(unsigned int virq,irq_flow_handler_t flow_handler,const char * name,int do_ack)238 void leon_update_virq_handling(unsigned int virq,
239 irq_flow_handler_t flow_handler,
240 const char *name, int do_ack)
241 {
242 unsigned long mask = (unsigned long)irq_get_chip_data(virq);
243
244 mask &= ~LEON_DO_ACK_HW;
245 if (do_ack)
246 mask |= LEON_DO_ACK_HW;
247
248 irq_set_chip_and_handler_name(virq, &leon_irq,
249 flow_handler, name);
250 irq_set_chip_data(virq, (void *)mask);
251 }
252
leon_init_timers(irq_handler_t counter_fn)253 void __init leon_init_timers(irq_handler_t counter_fn)
254 {
255 int irq, eirq;
256 struct device_node *rootnp, *np, *nnp;
257 struct property *pp;
258 int len;
259 int icsel;
260 int ampopts;
261 int err;
262
263 leondebug_irq_disable = 0;
264 leon_debug_irqout = 0;
265 master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
266 dummy_master_l10_counter = 0;
267
268 rootnp = of_find_node_by_path("/ambapp0");
269 if (!rootnp)
270 goto bad;
271
272 /* Find System ID: GRLIB build ID and optional CHIP ID */
273 pp = of_find_property(rootnp, "systemid", &len);
274 if (pp)
275 amba_system_id = *(unsigned long *)pp->value;
276
277 /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
278 np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
279 if (!np) {
280 np = of_find_node_by_name(rootnp, "01_00d");
281 if (!np)
282 goto bad;
283 }
284 pp = of_find_property(np, "reg", &len);
285 if (!pp)
286 goto bad;
287 leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
288
289 /* Find GPTIMER Timer Registers base address otherwise bail out. */
290 nnp = rootnp;
291 do {
292 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
293 if (!np) {
294 np = of_find_node_by_name(nnp, "01_011");
295 if (!np)
296 goto bad;
297 }
298
299 ampopts = 0;
300 pp = of_find_property(np, "ampopts", &len);
301 if (pp) {
302 ampopts = *(int *)pp->value;
303 if (ampopts == 0) {
304 /* Skip this instance, resource already
305 * allocated by other OS */
306 nnp = np;
307 continue;
308 }
309 }
310
311 /* Select Timer-Instance on Timer Core. Default is zero */
312 leon3_gptimer_idx = ampopts & 0x7;
313
314 pp = of_find_property(np, "reg", &len);
315 if (pp)
316 leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
317 pp->value;
318 pp = of_find_property(np, "interrupts", &len);
319 if (pp)
320 leon3_gptimer_irq = *(unsigned int *)pp->value;
321 } while (0);
322
323 if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
324 goto bad;
325
326 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
327 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
328 (((1000000 / HZ) - 1)));
329 LEON3_BYPASS_STORE_PA(
330 &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
331
332 #ifdef CONFIG_SMP
333 leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
334
335 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
336 (1<<LEON3_GPTIMER_SEPIRQ))) {
337 printk(KERN_ERR "timer not configured with separate irqs\n");
338 BUG();
339 }
340
341 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val,
342 0);
343 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
344 (((1000000/HZ) - 1)));
345 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
346 0);
347 #endif
348
349 /*
350 * The IRQ controller may (if implemented) consist of multiple
351 * IRQ controllers, each mapped on a 4Kb boundary.
352 * Each CPU may be routed to different IRQCTRLs, however
353 * we assume that all CPUs (in SMP system) is routed to the
354 * same IRQ Controller, and for non-SMP only one IRQCTRL is
355 * accessed anyway.
356 * In AMP systems, Linux must run on CPU0 for the time being.
357 */
358 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]);
359 icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf;
360 leon3_irqctrl_regs += icsel;
361
362 /* Mask all IRQs on boot-cpu IRQ controller */
363 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0);
364
365 /* Probe extended IRQ controller */
366 eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
367 >> 16) & 0xf;
368 if (eirq != 0)
369 leon_eirq_setup(eirq);
370
371 irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx);
372 err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL);
373 if (err) {
374 printk(KERN_ERR "unable to attach timer IRQ%d\n", irq);
375 prom_halt();
376 }
377
378 #ifdef CONFIG_SMP
379 {
380 unsigned long flags;
381
382 /*
383 * In SMP, sun4m adds a IPI handler to IRQ trap handler that
384 * LEON never must take, sun4d and LEON overwrites the branch
385 * with a NOP.
386 */
387 local_irq_save(flags);
388 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
389 local_flush_cache_all();
390 local_irq_restore(flags);
391 }
392 #endif
393
394 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
395 LEON3_GPTIMER_EN |
396 LEON3_GPTIMER_RL |
397 LEON3_GPTIMER_LD |
398 LEON3_GPTIMER_IRQEN);
399
400 #ifdef CONFIG_SMP
401 /* Install per-cpu IRQ handler for broadcasted ticker */
402 irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq,
403 "per-cpu", 0);
404 err = request_irq(irq, leon_percpu_timer_interrupt,
405 IRQF_PERCPU | IRQF_TIMER, "ticker",
406 NULL);
407 if (err) {
408 printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
409 prom_halt();
410 }
411
412 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
413 LEON3_GPTIMER_EN |
414 LEON3_GPTIMER_RL |
415 LEON3_GPTIMER_LD |
416 LEON3_GPTIMER_IRQEN);
417 #endif
418 return;
419 bad:
420 printk(KERN_ERR "No Timer/irqctrl found\n");
421 BUG();
422 return;
423 }
424
leon_clear_clock_irq(void)425 void leon_clear_clock_irq(void)
426 {
427 }
428
leon_load_profile_irq(int cpu,unsigned int limit)429 void leon_load_profile_irq(int cpu, unsigned int limit)
430 {
431 BUG();
432 }
433
leon_trans_init(struct device_node * dp)434 void __init leon_trans_init(struct device_node *dp)
435 {
436 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
437 struct property *p;
438 p = of_find_property(dp, "mid", (void *)0);
439 if (p) {
440 int mid;
441 dp->name = prom_early_alloc(5 + 1);
442 memcpy(&mid, p->value, p->length);
443 sprintf((char *)dp->name, "cpu%.2d", mid);
444 }
445 }
446 }
447
448 void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;
449
leon_node_init(struct device_node * dp,struct device_node *** nextp)450 void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
451 {
452 if (prom_amba_init &&
453 strcmp(dp->type, "ambapp") == 0 &&
454 strcmp(dp->name, "ambapp0") == 0) {
455 prom_amba_init(dp, nextp);
456 }
457 }
458
459 #ifdef CONFIG_SMP
460
leon_set_cpu_int(int cpu,int level)461 void leon_set_cpu_int(int cpu, int level)
462 {
463 unsigned long mask;
464 mask = get_irqmask(level);
465 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
466 }
467
leon_clear_ipi(int cpu,int level)468 static void leon_clear_ipi(int cpu, int level)
469 {
470 unsigned long mask;
471 mask = get_irqmask(level);
472 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
473 }
474
leon_set_udt(int cpu)475 static void leon_set_udt(int cpu)
476 {
477 }
478
leon_clear_profile_irq(int cpu)479 void leon_clear_profile_irq(int cpu)
480 {
481 }
482
leon_enable_irq_cpu(unsigned int irq_nr,unsigned int cpu)483 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
484 {
485 unsigned long mask, flags, *addr;
486 mask = get_irqmask(irq_nr);
487 spin_lock_irqsave(&leon_irq_lock, flags);
488 addr = (unsigned long *)LEON_IMASK(cpu);
489 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));
490 spin_unlock_irqrestore(&leon_irq_lock, flags);
491 }
492
493 #endif
494
leon_init_IRQ(void)495 void __init leon_init_IRQ(void)
496 {
497 sparc_irq_config.init_timers = leon_init_timers;
498 sparc_irq_config.build_device_irq = _leon_build_device_irq;
499
500 BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq,
501 BTFIXUPCALL_NORM);
502 BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq,
503 BTFIXUPCALL_NOP);
504
505 #ifdef CONFIG_SMP
506 BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM);
507 BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM);
508 BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM);
509 #endif
510
511 }
512
leon_init(void)513 void __init leon_init(void)
514 {
515 of_pdt_build_more = &leon_node_init;
516 }
517