2 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
3 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
6 #include <linux/kernel.h>
7 #include <linux/errno.h>
8 #include <linux/mutex.h>
10 #include <linux/of_platform.h>
11 #include <linux/interrupt.h>
12 #include <linux/of_device.h>
13 #include <linux/clocksource.h>
14 #include <linux/clockchips.h>
16 #include <asm/oplib.h>
17 #include <asm/timer.h>
20 #include <asm/leon_amba.h>
21 #include <asm/traps.h>
22 #include <asm/cacheflush.h>
24 #include <asm/setup.h>
30 struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
31 struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
33 int leondebug_irq_disable;
34 int leon_debug_irqout;
35 static int dummy_master_l10_counter;
36 unsigned long amba_system_id;
37 static DEFINE_SPINLOCK(leon_irq_lock);
39 unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
40 unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
41 int leon3_ticker_irq; /* Timer ticker IRQ */
42 unsigned int sparc_leon_eirq;
43 #define LEON_IMASK(cpu) (&leon3_irqctrl_regs->mask[cpu])
44 #define LEON_IACK (&leon3_irqctrl_regs->iclear)
45 #define LEON_DO_ACK_HW 1
47 /* Return the last ACKed IRQ by the Extended IRQ controller. It has already
48 * been (automatically) ACKed when the CPU takes the trap.
50 static inline unsigned int leon_eirq_get(int cpu)
52 return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
55 /* Handle one or multiple IRQs from the extended interrupt controller */
56 static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc)
60 int cpu = sparc_leon3_cpuid();
62 eirq = leon_eirq_get(cpu);
64 if ((eirq & 0x10) && p && p->irq) /* bit4 tells if IRQ happened */
65 generic_handle_irq(p->irq);
68 /* The extended IRQ controller has been found, this function registers it */
69 void leon_eirq_setup(unsigned int eirq)
71 unsigned long mask, oldmask;
74 if (eirq < 1 || eirq > 0xf) {
75 printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);
79 veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0);
82 * Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ
83 * controller have a mask-bit of their own, so this is safe.
87 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id));
88 LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask | mask));
89 sparc_leon_eirq = eirq;
92 unsigned long leon_get_irqmask(unsigned int irq)
96 if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
97 || ((irq > 0x1f) && sparc_leon_eirq)) {
99 "leon_get_irqmask: false irq number: %d\n", irq);
102 mask = LEON_HARD_INT(irq);
108 static int irq_choose_cpu(const struct cpumask *affinity)
112 cpumask_and(&mask, cpu_online_mask, affinity);
113 if (cpumask_equal(&mask, cpu_online_mask) || cpumask_empty(&mask))
116 return cpumask_first(&mask);
119 #define irq_choose_cpu(affinity) boot_cpu_id
122 static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest,
125 unsigned long mask, oldmask, flags;
128 mask = (unsigned long)data->chip_data;
129 oldcpu = irq_choose_cpu(data->affinity);
130 newcpu = irq_choose_cpu(dest);
132 if (oldcpu == newcpu)
135 /* unmask on old CPU first before enabling on the selected CPU */
136 spin_lock_irqsave(&leon_irq_lock, flags);
137 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(oldcpu));
138 LEON3_BYPASS_STORE_PA(LEON_IMASK(oldcpu), (oldmask & ~mask));
139 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(newcpu));
140 LEON3_BYPASS_STORE_PA(LEON_IMASK(newcpu), (oldmask | mask));
141 spin_unlock_irqrestore(&leon_irq_lock, flags);
143 return IRQ_SET_MASK_OK;
146 static void leon_unmask_irq(struct irq_data *data)
148 unsigned long mask, oldmask, flags;
151 mask = (unsigned long)data->chip_data;
152 cpu = irq_choose_cpu(data->affinity);
153 spin_lock_irqsave(&leon_irq_lock, flags);
154 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
155 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask | mask));
156 spin_unlock_irqrestore(&leon_irq_lock, flags);
159 static void leon_mask_irq(struct irq_data *data)
161 unsigned long mask, oldmask, flags;
164 mask = (unsigned long)data->chip_data;
165 cpu = irq_choose_cpu(data->affinity);
166 spin_lock_irqsave(&leon_irq_lock, flags);
167 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
168 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask & ~mask));
169 spin_unlock_irqrestore(&leon_irq_lock, flags);
172 static unsigned int leon_startup_irq(struct irq_data *data)
175 leon_unmask_irq(data);
179 static void leon_shutdown_irq(struct irq_data *data)
182 irq_unlink(data->irq);
185 /* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */
186 static void leon_eoi_irq(struct irq_data *data)
188 unsigned long mask = (unsigned long)data->chip_data;
190 if (mask & LEON_DO_ACK_HW)
191 LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);
194 static struct irq_chip leon_irq = {
196 .irq_startup = leon_startup_irq,
197 .irq_shutdown = leon_shutdown_irq,
198 .irq_mask = leon_mask_irq,
199 .irq_unmask = leon_unmask_irq,
200 .irq_eoi = leon_eoi_irq,
201 .irq_set_affinity = leon_set_affinity,
205 * Build a LEON IRQ for the edge triggered LEON IRQ controller:
206 * Edge (normal) IRQ - handle_simple_irq, ack=DONT-CARE, never ack
207 * Level IRQ (PCI|Level-GPIO) - handle_fasteoi_irq, ack=1, ack after ISR
208 * Per-CPU Edge - handle_percpu_irq, ack=0
210 unsigned int leon_build_device_irq(unsigned int real_irq,
211 irq_flow_handler_t flow_handler,
212 const char *name, int do_ack)
216 struct irq_desc *desc;
219 mask = leon_get_irqmask(real_irq);
223 irq = irq_alloc(real_irq, real_irq);
228 mask |= LEON_DO_ACK_HW;
230 desc = irq_to_desc(irq);
231 if (!desc || !desc->handle_irq || desc->handle_irq == handle_bad_irq) {
232 irq_set_chip_and_handler_name(irq, &leon_irq,
234 irq_set_chip_data(irq, (void *)mask);
241 static unsigned int _leon_build_device_irq(struct platform_device *op,
242 unsigned int real_irq)
244 return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);
247 void leon_update_virq_handling(unsigned int virq,
248 irq_flow_handler_t flow_handler,
249 const char *name, int do_ack)
251 unsigned long mask = (unsigned long)irq_get_chip_data(virq);
253 mask &= ~LEON_DO_ACK_HW;
255 mask |= LEON_DO_ACK_HW;
257 irq_set_chip_and_handler_name(virq, &leon_irq,
259 irq_set_chip_data(virq, (void *)mask);
262 static u32 leon_cycles_offset(void)
265 rld = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld);
266 val = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val);
273 /* smp clockevent irq */
274 irqreturn_t leon_percpu_timer_ce_interrupt(int irq, void *unused)
276 struct clock_event_device *ce;
277 int cpu = smp_processor_id();
279 leon_clear_profile_irq(cpu);
281 ce = &per_cpu(sparc32_clockevent, cpu);
284 if (ce->event_handler)
285 ce->event_handler(ce);
291 #endif /* CONFIG_SMP */
293 void __init leon_init_timers(void)
296 struct device_node *rootnp, *np, *nnp;
303 sparc_config.get_cycles_offset = leon_cycles_offset;
304 sparc_config.cs_period = 1000000 / HZ;
305 sparc_config.features |= FEAT_L10_CLOCKSOURCE;
308 sparc_config.features |= FEAT_L10_CLOCKEVENT;
311 leondebug_irq_disable = 0;
312 leon_debug_irqout = 0;
313 master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
314 dummy_master_l10_counter = 0;
316 rootnp = of_find_node_by_path("/ambapp0");
320 /* Find System ID: GRLIB build ID and optional CHIP ID */
321 pp = of_find_property(rootnp, "systemid", &len);
323 amba_system_id = *(unsigned long *)pp->value;
325 /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
326 np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
328 np = of_find_node_by_name(rootnp, "01_00d");
332 pp = of_find_property(np, "reg", &len);
335 leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
337 /* Find GPTIMER Timer Registers base address otherwise bail out. */
340 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
342 np = of_find_node_by_name(nnp, "01_011");
348 pp = of_find_property(np, "ampopts", &len);
350 ampopts = *(int *)pp->value;
352 /* Skip this instance, resource already
353 * allocated by other OS */
359 /* Select Timer-Instance on Timer Core. Default is zero */
360 leon3_gptimer_idx = ampopts & 0x7;
362 pp = of_find_property(np, "reg", &len);
364 leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
366 pp = of_find_property(np, "interrupts", &len);
368 leon3_gptimer_irq = *(unsigned int *)pp->value;
371 if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
374 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
375 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
376 (((1000000 / HZ) - 1)));
377 LEON3_BYPASS_STORE_PA(
378 &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
381 leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
383 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
384 (1<<LEON3_GPTIMER_SEPIRQ))) {
385 printk(KERN_ERR "timer not configured with separate irqs\n");
389 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val,
391 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
392 (((1000000/HZ) - 1)));
393 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
398 * The IRQ controller may (if implemented) consist of multiple
399 * IRQ controllers, each mapped on a 4Kb boundary.
400 * Each CPU may be routed to different IRQCTRLs, however
401 * we assume that all CPUs (in SMP system) is routed to the
402 * same IRQ Controller, and for non-SMP only one IRQCTRL is
404 * In AMP systems, Linux must run on CPU0 for the time being.
406 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]);
407 icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf;
408 leon3_irqctrl_regs += icsel;
410 /* Mask all IRQs on boot-cpu IRQ controller */
411 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0);
413 /* Probe extended IRQ controller */
414 eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
417 leon_eirq_setup(eirq);
419 irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx);
420 err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL);
422 printk(KERN_ERR "unable to attach timer IRQ%d\n", irq);
431 * In SMP, sun4m adds a IPI handler to IRQ trap handler that
432 * LEON never must take, sun4d and LEON overwrites the branch
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);
442 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
446 LEON3_GPTIMER_IRQEN);
449 /* Install per-cpu IRQ handler for broadcasted ticker */
450 irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq,
452 err = request_irq(irq, leon_percpu_timer_ce_interrupt,
453 IRQF_PERCPU | IRQF_TIMER, "ticker",
456 printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
460 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
464 LEON3_GPTIMER_IRQEN);
468 printk(KERN_ERR "No Timer/irqctrl found\n");
473 static void leon_clear_clock_irq(void)
477 static void leon_load_profile_irq(int cpu, unsigned int limit)
481 void __init leon_trans_init(struct device_node *dp)
483 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
485 p = of_find_property(dp, "mid", (void *)0);
488 dp->name = prom_early_alloc(5 + 1);
489 memcpy(&mid, p->value, p->length);
490 sprintf((char *)dp->name, "cpu%.2d", mid);
496 void leon_clear_profile_irq(int cpu)
500 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
502 unsigned long mask, flags, *addr;
503 mask = leon_get_irqmask(irq_nr);
504 spin_lock_irqsave(&leon_irq_lock, flags);
505 addr = (unsigned long *)LEON_IMASK(cpu);
506 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));
507 spin_unlock_irqrestore(&leon_irq_lock, flags);
512 void __init leon_init_IRQ(void)
514 sparc_config.init_timers = leon_init_timers;
515 sparc_config.build_device_irq = _leon_build_device_irq;
516 sparc_config.clock_rate = 1000000;
517 sparc_config.clear_clock_irq = leon_clear_clock_irq;
518 sparc_config.load_profile_irq = leon_load_profile_irq;