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>
26 struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
27 struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
28 struct amba_apb_device leon_percpu_timer_dev[16];
30 int leondebug_irq_disable;
31 int leon_debug_irqout;
32 static int dummy_master_l10_counter;
33 unsigned long amba_system_id;
35 unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
36 unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
37 unsigned int sparc_leon_eirq;
38 #define LEON_IMASK ((&leon3_irqctrl_regs->mask[0]))
40 /* Return the IRQ of the pending IRQ on the extended IRQ controller */
41 int sparc_leon_eirq_get(int eirq, int cpu)
43 return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
46 irqreturn_t sparc_leon_eirq_isr(int dummy, void *dev_id)
48 printk(KERN_ERR "sparc_leon_eirq_isr: ERROR EXTENDED IRQ\n");
52 /* The extended IRQ controller has been found, this function registers it */
53 void sparc_leon_eirq_register(int eirq)
57 /* Register a "BAD" handler for this interrupt, it should never happen */
58 irq = request_irq(eirq, sparc_leon_eirq_isr,
59 (IRQF_DISABLED | SA_STATIC_ALLOC), "extirq", NULL);
63 "sparc_leon_eirq_register: unable to attach IRQ%d\n",
66 sparc_leon_eirq = eirq;
71 static inline unsigned long get_irqmask(unsigned int irq)
75 if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
76 || ((irq > 0x1f) && sparc_leon_eirq)) {
78 "leon_get_irqmask: false irq number: %d\n", irq);
81 mask = LEON_HARD_INT(irq);
86 static void leon_enable_irq(unsigned int irq_nr)
88 unsigned long mask, flags;
89 mask = get_irqmask(irq_nr);
90 local_irq_save(flags);
91 LEON3_BYPASS_STORE_PA(LEON_IMASK,
92 (LEON3_BYPASS_LOAD_PA(LEON_IMASK) | (mask)));
93 local_irq_restore(flags);
96 static void leon_disable_irq(unsigned int irq_nr)
98 unsigned long mask, flags;
99 mask = get_irqmask(irq_nr);
100 local_irq_save(flags);
101 LEON3_BYPASS_STORE_PA(LEON_IMASK,
102 (LEON3_BYPASS_LOAD_PA(LEON_IMASK) & ~(mask)));
103 local_irq_restore(flags);
107 void __init leon_init_timers(irq_handler_t counter_fn)
110 struct device_node *rootnp, *np, *nnp;
116 leondebug_irq_disable = 0;
117 leon_debug_irqout = 0;
118 master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
119 dummy_master_l10_counter = 0;
121 rootnp = of_find_node_by_path("/ambapp0");
125 /* Find System ID: GRLIB build ID and optional CHIP ID */
126 pp = of_find_property(rootnp, "systemid", &len);
128 amba_system_id = *(unsigned long *)pp->value;
130 /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
131 np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
133 np = of_find_node_by_name(rootnp, "01_00d");
137 pp = of_find_property(np, "reg", &len);
140 leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
142 /* Find GPTIMER Timer Registers base address otherwise bail out. */
145 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
147 np = of_find_node_by_name(nnp, "01_011");
153 pp = of_find_property(np, "ampopts", &len);
155 ampopts = *(int *)pp->value;
157 /* Skip this instance, resource already
158 * allocated by other OS */
164 /* Select Timer-Instance on Timer Core. Default is zero */
165 leon3_gptimer_idx = ampopts & 0x7;
167 pp = of_find_property(np, "reg", &len);
169 leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
171 pp = of_find_property(np, "interrupts", &len);
173 leon3_gptimer_irq = *(unsigned int *)pp->value;
176 if (leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq) {
177 LEON3_BYPASS_STORE_PA(
178 &leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
179 LEON3_BYPASS_STORE_PA(
180 &leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
181 (((1000000 / HZ) - 1)));
182 LEON3_BYPASS_STORE_PA(
183 &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
186 leon_percpu_timer_dev[0].start = (int)leon3_gptimer_regs;
187 leon_percpu_timer_dev[0].irq = leon3_gptimer_irq + 1 +
190 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
191 (1<<LEON3_GPTIMER_SEPIRQ))) {
192 prom_printf("irq timer not configured with separate irqs\n");
196 LEON3_BYPASS_STORE_PA(
197 &leon3_gptimer_regs->e[leon3_gptimer_idx+1].val, 0);
198 LEON3_BYPASS_STORE_PA(
199 &leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
200 (((1000000/HZ) - 1)));
201 LEON3_BYPASS_STORE_PA(
202 &leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 0);
206 * The IRQ controller may (if implemented) consist of multiple
207 * IRQ controllers, each mapped on a 4Kb boundary.
208 * Each CPU may be routed to different IRQCTRLs, however
209 * we assume that all CPUs (in SMP system) is routed to the
210 * same IRQ Controller, and for non-SMP only one IRQCTRL is
212 * In AMP systems, Linux must run on CPU0 for the time being.
214 cpu = sparc_leon3_cpuid();
215 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[cpu/8]);
216 icsel = (icsel >> ((7 - (cpu&0x7)) * 4)) & 0xf;
217 leon3_irqctrl_regs += icsel;
222 irq = request_irq(leon3_gptimer_irq+leon3_gptimer_idx,
224 (IRQF_DISABLED | SA_STATIC_ALLOC), "timer", NULL);
227 printk(KERN_ERR "leon_time_init: unable to attach IRQ%d\n",
228 LEON_INTERRUPT_TIMER1);
235 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_percpu_timer_dev[0].irq - 1)];
237 /* For SMP we use the level 14 ticker, however the bootup code
238 * has copied the firmwares level 14 vector into boot cpu's
239 * trap table, we must fix this now or we get squashed.
241 local_irq_save(flags);
243 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
245 /* Adjust so that we jump directly to smpleon_ticker */
246 trap_table->inst_three += smpleon_ticker - real_irq_entry;
248 local_flush_cache_all();
249 local_irq_restore(flags);
253 if (leon3_gptimer_regs) {
254 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
257 LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
260 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
264 LEON3_GPTIMER_IRQEN);
270 printk(KERN_ERR "No Timer/irqctrl found\n");
275 void leon_clear_clock_irq(void)
279 void leon_load_profile_irq(int cpu, unsigned int limit)
287 void __init leon_trans_init(struct device_node *dp)
289 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
291 p = of_find_property(dp, "mid", (void *)0);
294 dp->name = prom_early_alloc(5 + 1);
295 memcpy(&mid, p->value, p->length);
296 sprintf((char *)dp->name, "cpu%.2d", mid);
301 void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;
303 void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
305 if (prom_amba_init &&
306 strcmp(dp->type, "ambapp") == 0 &&
307 strcmp(dp->name, "ambapp0") == 0) {
308 prom_amba_init(dp, nextp);
314 void leon_set_cpu_int(int cpu, int level)
317 mask = get_irqmask(level);
318 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
321 static void leon_clear_ipi(int cpu, int level)
324 mask = get_irqmask(level);
325 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
328 static void leon_set_udt(int cpu)
332 void leon_clear_profile_irq(int cpu)
336 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
338 unsigned long mask, flags, *addr;
339 mask = get_irqmask(irq_nr);
340 local_irq_save(flags);
341 addr = (unsigned long *)&(leon3_irqctrl_regs->mask[cpu]);
342 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | (mask)));
343 local_irq_restore(flags);
348 void __init leon_init_IRQ(void)
350 sparc_irq_config.init_timers = leon_init_timers;
352 BTFIXUPSET_CALL(enable_irq, leon_enable_irq, BTFIXUPCALL_NORM);
353 BTFIXUPSET_CALL(disable_irq, leon_disable_irq, BTFIXUPCALL_NORM);
354 BTFIXUPSET_CALL(enable_pil_irq, leon_enable_irq, BTFIXUPCALL_NORM);
355 BTFIXUPSET_CALL(disable_pil_irq, leon_disable_irq, BTFIXUPCALL_NORM);
357 BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq,
359 BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq,
363 BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM);
364 BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM);
365 BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM);
370 void __init leon_init(void)
372 of_pdt_build_more = &leon_node_init;