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>
29 struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
30 struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
32 int leondebug_irq_disable;
33 int leon_debug_irqout;
34 static int dummy_master_l10_counter;
35 unsigned long amba_system_id;
36 static DEFINE_SPINLOCK(leon_irq_lock);
38 unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
39 unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
40 int leon3_ticker_irq; /* Timer ticker IRQ */
41 unsigned 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
46 /* Return the last ACKed IRQ by the Extended IRQ controller. It has already
47 * been (automatically) ACKed when the CPU takes the trap.
49 static inline unsigned int leon_eirq_get(int cpu)
51 return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
54 /* Handle one or multiple IRQs from the extended interrupt controller */
55 static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc)
58 int cpu = sparc_leon3_cpuid();
60 eirq = leon_eirq_get(cpu);
61 if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */
62 generic_handle_irq(irq_map[eirq]->irq);
65 /* The extended IRQ controller has been found, this function registers it */
66 void leon_eirq_setup(unsigned int eirq)
68 unsigned long mask, oldmask;
71 if (eirq < 1 || eirq > 0xf) {
72 printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);
76 veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0);
79 * Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ
80 * controller have a mask-bit of their own, so this is safe.
84 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id));
85 LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask | mask));
86 sparc_leon_eirq = eirq;
89 unsigned long leon_get_irqmask(unsigned int irq)
93 if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
94 || ((irq > 0x1f) && sparc_leon_eirq)) {
96 "leon_get_irqmask: false irq number: %d\n", irq);
99 mask = LEON_HARD_INT(irq);
105 static int irq_choose_cpu(const struct cpumask *affinity)
109 cpumask_and(&mask, cpu_online_mask, affinity);
110 if (cpumask_equal(&mask, cpu_online_mask) || cpumask_empty(&mask))
113 return cpumask_first(&mask);
116 #define irq_choose_cpu(affinity) boot_cpu_id
119 static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest,
122 unsigned long mask, oldmask, flags;
125 mask = (unsigned long)data->chip_data;
126 oldcpu = irq_choose_cpu(data->affinity);
127 newcpu = irq_choose_cpu(dest);
129 if (oldcpu == newcpu)
132 /* unmask on old CPU first before enabling on the selected CPU */
133 spin_lock_irqsave(&leon_irq_lock, flags);
134 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(oldcpu));
135 LEON3_BYPASS_STORE_PA(LEON_IMASK(oldcpu), (oldmask & ~mask));
136 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(newcpu));
137 LEON3_BYPASS_STORE_PA(LEON_IMASK(newcpu), (oldmask | mask));
138 spin_unlock_irqrestore(&leon_irq_lock, flags);
140 return IRQ_SET_MASK_OK;
143 static void leon_unmask_irq(struct irq_data *data)
145 unsigned long mask, oldmask, flags;
148 mask = (unsigned long)data->chip_data;
149 cpu = irq_choose_cpu(data->affinity);
150 spin_lock_irqsave(&leon_irq_lock, flags);
151 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
152 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask | mask));
153 spin_unlock_irqrestore(&leon_irq_lock, flags);
156 static void leon_mask_irq(struct irq_data *data)
158 unsigned long mask, oldmask, flags;
161 mask = (unsigned long)data->chip_data;
162 cpu = irq_choose_cpu(data->affinity);
163 spin_lock_irqsave(&leon_irq_lock, flags);
164 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
165 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask & ~mask));
166 spin_unlock_irqrestore(&leon_irq_lock, flags);
169 static unsigned int leon_startup_irq(struct irq_data *data)
172 leon_unmask_irq(data);
176 static void leon_shutdown_irq(struct irq_data *data)
179 irq_unlink(data->irq);
182 /* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */
183 static void leon_eoi_irq(struct irq_data *data)
185 unsigned long mask = (unsigned long)data->chip_data;
187 if (mask & LEON_DO_ACK_HW)
188 LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);
191 static struct irq_chip leon_irq = {
193 .irq_startup = leon_startup_irq,
194 .irq_shutdown = leon_shutdown_irq,
195 .irq_mask = leon_mask_irq,
196 .irq_unmask = leon_unmask_irq,
197 .irq_eoi = leon_eoi_irq,
198 .irq_set_affinity = leon_set_affinity,
202 * Build a LEON IRQ for the edge triggered LEON IRQ controller:
203 * Edge (normal) IRQ - handle_simple_irq, ack=DONT-CARE, never ack
204 * Level IRQ (PCI|Level-GPIO) - handle_fasteoi_irq, ack=1, ack after ISR
205 * Per-CPU Edge - handle_percpu_irq, ack=0
207 unsigned int leon_build_device_irq(unsigned int real_irq,
208 irq_flow_handler_t flow_handler,
209 const char *name, int do_ack)
215 mask = leon_get_irqmask(real_irq);
219 irq = irq_alloc(real_irq, real_irq);
224 mask |= LEON_DO_ACK_HW;
226 irq_set_chip_and_handler_name(irq, &leon_irq,
228 irq_set_chip_data(irq, (void *)mask);
234 static unsigned int _leon_build_device_irq(struct platform_device *op,
235 unsigned int real_irq)
237 return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);
240 void leon_update_virq_handling(unsigned int virq,
241 irq_flow_handler_t flow_handler,
242 const char *name, int do_ack)
244 unsigned long mask = (unsigned long)irq_get_chip_data(virq);
246 mask &= ~LEON_DO_ACK_HW;
248 mask |= LEON_DO_ACK_HW;
250 irq_set_chip_and_handler_name(virq, &leon_irq,
252 irq_set_chip_data(virq, (void *)mask);
255 static u32 leon_cycles_offset(void)
258 rld = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld);
259 val = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val);
266 /* smp clockevent irq */
267 irqreturn_t leon_percpu_timer_ce_interrupt(int irq, void *unused)
269 struct clock_event_device *ce;
270 int cpu = smp_processor_id();
272 leon_clear_profile_irq(cpu);
274 ce = &per_cpu(sparc32_clockevent, cpu);
277 if (ce->event_handler)
278 ce->event_handler(ce);
284 #endif /* CONFIG_SMP */
286 void __init leon_init_timers(void)
289 struct device_node *rootnp, *np, *nnp;
296 sparc_config.get_cycles_offset = leon_cycles_offset;
297 sparc_config.cs_period = 1000000 / HZ;
298 sparc_config.features |= FEAT_L10_CLOCKSOURCE;
301 sparc_config.features |= FEAT_L10_CLOCKEVENT;
304 leondebug_irq_disable = 0;
305 leon_debug_irqout = 0;
306 master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
307 dummy_master_l10_counter = 0;
309 rootnp = of_find_node_by_path("/ambapp0");
313 /* Find System ID: GRLIB build ID and optional CHIP ID */
314 pp = of_find_property(rootnp, "systemid", &len);
316 amba_system_id = *(unsigned long *)pp->value;
318 /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
319 np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
321 np = of_find_node_by_name(rootnp, "01_00d");
325 pp = of_find_property(np, "reg", &len);
328 leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
330 /* Find GPTIMER Timer Registers base address otherwise bail out. */
333 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
335 np = of_find_node_by_name(nnp, "01_011");
341 pp = of_find_property(np, "ampopts", &len);
343 ampopts = *(int *)pp->value;
345 /* Skip this instance, resource already
346 * allocated by other OS */
352 /* Select Timer-Instance on Timer Core. Default is zero */
353 leon3_gptimer_idx = ampopts & 0x7;
355 pp = of_find_property(np, "reg", &len);
357 leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
359 pp = of_find_property(np, "interrupts", &len);
361 leon3_gptimer_irq = *(unsigned int *)pp->value;
364 if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
367 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
368 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
369 (((1000000 / HZ) - 1)));
370 LEON3_BYPASS_STORE_PA(
371 &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
374 leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
376 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
377 (1<<LEON3_GPTIMER_SEPIRQ))) {
378 printk(KERN_ERR "timer not configured with separate irqs\n");
382 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val,
384 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
385 (((1000000/HZ) - 1)));
386 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
391 * The IRQ controller may (if implemented) consist of multiple
392 * IRQ controllers, each mapped on a 4Kb boundary.
393 * Each CPU may be routed to different IRQCTRLs, however
394 * we assume that all CPUs (in SMP system) is routed to the
395 * same IRQ Controller, and for non-SMP only one IRQCTRL is
397 * In AMP systems, Linux must run on CPU0 for the time being.
399 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]);
400 icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf;
401 leon3_irqctrl_regs += icsel;
403 /* Mask all IRQs on boot-cpu IRQ controller */
404 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0);
406 /* Probe extended IRQ controller */
407 eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
410 leon_eirq_setup(eirq);
412 irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx);
413 err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL);
415 printk(KERN_ERR "unable to attach timer IRQ%d\n", irq);
424 * In SMP, sun4m adds a IPI handler to IRQ trap handler that
425 * LEON never must take, sun4d and LEON overwrites the branch
428 local_irq_save(flags);
429 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
430 local_ops->cache_all();
431 local_irq_restore(flags);
435 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
439 LEON3_GPTIMER_IRQEN);
442 /* Install per-cpu IRQ handler for broadcasted ticker */
443 irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq,
445 err = request_irq(irq, leon_percpu_timer_ce_interrupt,
446 IRQF_PERCPU | IRQF_TIMER, "ticker",
449 printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
453 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
457 LEON3_GPTIMER_IRQEN);
461 printk(KERN_ERR "No Timer/irqctrl found\n");
466 static void leon_clear_clock_irq(void)
470 static void leon_load_profile_irq(int cpu, unsigned int limit)
474 void __init leon_trans_init(struct device_node *dp)
476 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
478 p = of_find_property(dp, "mid", (void *)0);
481 dp->name = prom_early_alloc(5 + 1);
482 memcpy(&mid, p->value, p->length);
483 sprintf((char *)dp->name, "cpu%.2d", mid);
488 void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;
490 void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
492 if (prom_amba_init &&
493 strcmp(dp->type, "ambapp") == 0 &&
494 strcmp(dp->name, "ambapp0") == 0) {
495 prom_amba_init(dp, nextp);
500 void leon_clear_profile_irq(int cpu)
504 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
506 unsigned long mask, flags, *addr;
507 mask = leon_get_irqmask(irq_nr);
508 spin_lock_irqsave(&leon_irq_lock, flags);
509 addr = (unsigned long *)LEON_IMASK(cpu);
510 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));
511 spin_unlock_irqrestore(&leon_irq_lock, flags);
516 void __init leon_init_IRQ(void)
518 sparc_config.init_timers = leon_init_timers;
519 sparc_config.build_device_irq = _leon_build_device_irq;
520 sparc_config.clock_rate = 1000000;
521 sparc_config.clear_clock_irq = leon_clear_clock_irq;
522 sparc_config.load_profile_irq = leon_load_profile_irq;
525 void __init leon_init(void)
527 of_pdt_build_more = &leon_node_init;