a19c8a063683205c35792991efad03fe961f8140
[linux-2.6.git] / arch / sparc / kernel / leon_kernel.c
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  */
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 */
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 */
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
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
103 static int irq_choose_cpu(const struct cpumask *affinity)
104 {
105         cpumask_t mask;
106
107         cpus_and(mask, cpu_online_map, *affinity);
108         if (cpus_equal(mask, cpu_online_map) || cpus_empty(mask))
109                 return boot_cpu_id;
110         else
111                 return first_cpu(mask);
112 }
113 #else
114 #define irq_choose_cpu(affinity) boot_cpu_id
115 #endif
116
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
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
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
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
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 */
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  */
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
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
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
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
425 void leon_clear_clock_irq(void)
426 {
427 }
428
429 void leon_load_profile_irq(int cpu, unsigned int limit)
430 {
431         BUG();
432 }
433
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
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
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
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
475 static void leon_set_udt(int cpu)
476 {
477 }
478
479 void leon_clear_profile_irq(int cpu)
480 {
481 }
482
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
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
513 void __init leon_init(void)
514 {
515         of_pdt_build_more = &leon_node_init;
516 }