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/module.h>
8 #include <linux/errno.h>
9 #include <linux/mutex.h>
11 #include <linux/of_platform.h>
12 #include <linux/interrupt.h>
13 #include <linux/of_device.h>
15 #include <asm/oplib.h>
16 #include <asm/timer.h>
19 #include <asm/leon_amba.h>
20 #include <asm/traps.h>
21 #include <asm/cacheflush.h>
23 #include <asm/setup.h>
28 struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
29 struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
31 int leondebug_irq_disable;
32 int leon_debug_irqout;
33 static int dummy_master_l10_counter;
34 unsigned long amba_system_id;
35 static DEFINE_SPINLOCK(leon_irq_lock);
37 unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
38 unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
39 int leon3_ticker_irq; /* Timer ticker IRQ */
40 unsigned int sparc_leon_eirq;
41 #define LEON_IMASK(cpu) (&leon3_irqctrl_regs->mask[cpu])
42 #define LEON_IACK (&leon3_irqctrl_regs->iclear)
43 #define LEON_DO_ACK_HW 1
45 /* Return the last ACKed IRQ by the Extended IRQ controller. It has already
46 * been (automatically) ACKed when the CPU takes the trap.
48 static inline unsigned int leon_eirq_get(int cpu)
50 return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
53 /* Handle one or multiple IRQs from the extended interrupt controller */
54 static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc)
57 int cpu = sparc_leon3_cpuid();
59 eirq = leon_eirq_get(cpu);
60 if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */
61 generic_handle_irq(irq_map[eirq]->irq);
64 /* The extended IRQ controller has been found, this function registers it */
65 void leon_eirq_setup(unsigned int eirq)
67 unsigned long mask, oldmask;
70 if (eirq < 1 || eirq > 0xf) {
71 printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);
75 veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0);
78 * Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ
79 * controller have a mask-bit of their own, so this is safe.
83 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id));
84 LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask | mask));
85 sparc_leon_eirq = eirq;
88 static inline unsigned long get_irqmask(unsigned int irq)
92 if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
93 || ((irq > 0x1f) && sparc_leon_eirq)) {
95 "leon_get_irqmask: false irq number: %d\n", irq);
98 mask = LEON_HARD_INT(irq);
104 static int irq_choose_cpu(const struct cpumask *affinity)
108 cpus_and(mask, cpu_online_map, *affinity);
109 if (cpus_equal(mask, cpu_online_map) || cpus_empty(mask))
112 return first_cpu(mask);
115 #define irq_choose_cpu(affinity) boot_cpu_id
118 static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest,
121 unsigned long mask, oldmask, flags;
124 mask = (unsigned long)data->chip_data;
125 oldcpu = irq_choose_cpu(data->affinity);
126 newcpu = irq_choose_cpu(dest);
128 if (oldcpu == newcpu)
131 /* unmask on old CPU first before enabling on the selected CPU */
132 spin_lock_irqsave(&leon_irq_lock, flags);
133 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(oldcpu));
134 LEON3_BYPASS_STORE_PA(LEON_IMASK(oldcpu), (oldmask & ~mask));
135 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(newcpu));
136 LEON3_BYPASS_STORE_PA(LEON_IMASK(newcpu), (oldmask | mask));
137 spin_unlock_irqrestore(&leon_irq_lock, flags);
139 return IRQ_SET_MASK_OK;
142 static void leon_unmask_irq(struct irq_data *data)
144 unsigned long mask, oldmask, flags;
147 mask = (unsigned long)data->chip_data;
148 cpu = irq_choose_cpu(data->affinity);
149 spin_lock_irqsave(&leon_irq_lock, flags);
150 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
151 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask | mask));
152 spin_unlock_irqrestore(&leon_irq_lock, flags);
155 static void leon_mask_irq(struct irq_data *data)
157 unsigned long mask, oldmask, flags;
160 mask = (unsigned long)data->chip_data;
161 cpu = irq_choose_cpu(data->affinity);
162 spin_lock_irqsave(&leon_irq_lock, flags);
163 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
164 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask & ~mask));
165 spin_unlock_irqrestore(&leon_irq_lock, flags);
168 static unsigned int leon_startup_irq(struct irq_data *data)
171 leon_unmask_irq(data);
175 static void leon_shutdown_irq(struct irq_data *data)
178 irq_unlink(data->irq);
181 /* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */
182 static void leon_eoi_irq(struct irq_data *data)
184 unsigned long mask = (unsigned long)data->chip_data;
186 if (mask & LEON_DO_ACK_HW)
187 LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);
190 static struct irq_chip leon_irq = {
192 .irq_startup = leon_startup_irq,
193 .irq_shutdown = leon_shutdown_irq,
194 .irq_mask = leon_mask_irq,
195 .irq_unmask = leon_unmask_irq,
196 .irq_eoi = leon_eoi_irq,
197 .irq_set_affinity = leon_set_affinity,
201 * Build a LEON IRQ for the edge triggered LEON IRQ controller:
202 * Edge (normal) IRQ - handle_simple_irq, ack=DONT-CARE, never ack
203 * Level IRQ (PCI|Level-GPIO) - handle_fasteoi_irq, ack=1, ack after ISR
204 * Per-CPU Edge - handle_percpu_irq, ack=0
206 unsigned int leon_build_device_irq(unsigned int real_irq,
207 irq_flow_handler_t flow_handler,
208 const char *name, int do_ack)
214 mask = get_irqmask(real_irq);
218 irq = irq_alloc(real_irq, real_irq);
223 mask |= LEON_DO_ACK_HW;
225 irq_set_chip_and_handler_name(irq, &leon_irq,
227 irq_set_chip_data(irq, (void *)mask);
233 static unsigned int _leon_build_device_irq(struct platform_device *op,
234 unsigned int real_irq)
236 return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);
239 void __init leon_init_timers(irq_handler_t counter_fn)
242 struct device_node *rootnp, *np, *nnp;
249 leondebug_irq_disable = 0;
250 leon_debug_irqout = 0;
251 master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
252 dummy_master_l10_counter = 0;
254 rootnp = of_find_node_by_path("/ambapp0");
258 /* Find System ID: GRLIB build ID and optional CHIP ID */
259 pp = of_find_property(rootnp, "systemid", &len);
261 amba_system_id = *(unsigned long *)pp->value;
263 /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
264 np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
266 np = of_find_node_by_name(rootnp, "01_00d");
270 pp = of_find_property(np, "reg", &len);
273 leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
275 /* Find GPTIMER Timer Registers base address otherwise bail out. */
278 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
280 np = of_find_node_by_name(nnp, "01_011");
286 pp = of_find_property(np, "ampopts", &len);
288 ampopts = *(int *)pp->value;
290 /* Skip this instance, resource already
291 * allocated by other OS */
297 /* Select Timer-Instance on Timer Core. Default is zero */
298 leon3_gptimer_idx = ampopts & 0x7;
300 pp = of_find_property(np, "reg", &len);
302 leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
304 pp = of_find_property(np, "interrupts", &len);
306 leon3_gptimer_irq = *(unsigned int *)pp->value;
309 if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
312 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
313 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
314 (((1000000 / HZ) - 1)));
315 LEON3_BYPASS_STORE_PA(
316 &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
319 leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
321 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
322 (1<<LEON3_GPTIMER_SEPIRQ))) {
323 printk(KERN_ERR "timer not configured with separate irqs\n");
327 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val,
329 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
330 (((1000000/HZ) - 1)));
331 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
336 * The IRQ controller may (if implemented) consist of multiple
337 * IRQ controllers, each mapped on a 4Kb boundary.
338 * Each CPU may be routed to different IRQCTRLs, however
339 * we assume that all CPUs (in SMP system) is routed to the
340 * same IRQ Controller, and for non-SMP only one IRQCTRL is
342 * In AMP systems, Linux must run on CPU0 for the time being.
344 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]);
345 icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf;
346 leon3_irqctrl_regs += icsel;
348 /* Mask all IRQs on boot-cpu IRQ controller */
349 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0);
351 /* Probe extended IRQ controller */
352 eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
355 leon_eirq_setup(eirq);
357 irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx);
358 err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL);
360 printk(KERN_ERR "unable to attach timer IRQ%d\n", irq);
364 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
368 LEON3_GPTIMER_IRQEN);
371 /* Install per-cpu IRQ handler for broadcasted ticker */
372 irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq,
374 err = request_irq(irq, leon_percpu_timer_interrupt,
375 IRQF_PERCPU | IRQF_TIMER, "ticker",
378 printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
382 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
386 LEON3_GPTIMER_IRQEN);
390 printk(KERN_ERR "No Timer/irqctrl found\n");
395 void leon_clear_clock_irq(void)
399 void leon_load_profile_irq(int cpu, unsigned int limit)
404 void __init leon_trans_init(struct device_node *dp)
406 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
408 p = of_find_property(dp, "mid", (void *)0);
411 dp->name = prom_early_alloc(5 + 1);
412 memcpy(&mid, p->value, p->length);
413 sprintf((char *)dp->name, "cpu%.2d", mid);
418 void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;
420 void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
422 if (prom_amba_init &&
423 strcmp(dp->type, "ambapp") == 0 &&
424 strcmp(dp->name, "ambapp0") == 0) {
425 prom_amba_init(dp, nextp);
431 void leon_set_cpu_int(int cpu, int level)
434 mask = get_irqmask(level);
435 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
438 static void leon_clear_ipi(int cpu, int level)
441 mask = get_irqmask(level);
442 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
445 static void leon_set_udt(int cpu)
449 void leon_clear_profile_irq(int cpu)
453 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
455 unsigned long mask, flags, *addr;
456 mask = get_irqmask(irq_nr);
457 spin_lock_irqsave(&leon_irq_lock, flags);
458 addr = (unsigned long *)LEON_IMASK(cpu);
459 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));
460 spin_unlock_irqrestore(&leon_irq_lock, flags);
465 void __init leon_init_IRQ(void)
467 sparc_irq_config.init_timers = leon_init_timers;
468 sparc_irq_config.build_device_irq = _leon_build_device_irq;
470 BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq,
472 BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq,
476 BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM);
477 BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM);
478 BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM);
483 void __init leon_init(void)
485 of_pdt_build_more = &leon_node_init;