ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / arch / sparc / kernel / leon_kernel.c
blobd17255a2bbac142be0f3fe3b1e5e4a60d49a363e
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 */
6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/errno.h>
9 #include <linux/mutex.h>
10 #include <linux/of.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>
17 #include <asm/prom.h>
18 #include <asm/leon.h>
19 #include <asm/leon_amba.h>
20 #include <asm/traps.h>
21 #include <asm/cacheflush.h>
22 #include <asm/smp.h>
23 #include <asm/setup.h>
25 #include "prom.h"
26 #include "irq.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)
56 unsigned int eirq;
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;
68 unsigned int veirq;
70 if (eirq < 1 || eirq > 0xf) {
71 printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);
72 return;
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.
81 irq_link(veirq);
82 mask = 1 << eirq;
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)
90 unsigned long mask;
92 if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
93 || ((irq > 0x1f) && sparc_leon_eirq)) {
94 printk(KERN_ERR
95 "leon_get_irqmask: false irq number: %d\n", irq);
96 mask = 0;
97 } else {
98 mask = LEON_HARD_INT(irq);
100 return mask;
103 #ifdef CONFIG_SMP
104 static int irq_choose_cpu(const struct cpumask *affinity)
106 cpumask_t mask;
108 cpus_and(mask, cpu_online_map, *affinity);
109 if (cpus_equal(mask, cpu_online_map) || cpus_empty(mask))
110 return boot_cpu_id;
111 else
112 return first_cpu(mask);
114 #else
115 #define irq_choose_cpu(affinity) boot_cpu_id
116 #endif
118 static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest,
119 bool force)
121 unsigned long mask, oldmask, flags;
122 int oldcpu, newcpu;
124 mask = (unsigned long)data->chip_data;
125 oldcpu = irq_choose_cpu(data->affinity);
126 newcpu = irq_choose_cpu(dest);
128 if (oldcpu == newcpu)
129 goto out;
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);
138 out:
139 return IRQ_SET_MASK_OK;
142 static void leon_unmask_irq(struct irq_data *data)
144 unsigned long mask, oldmask, flags;
145 int cpu;
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;
158 int cpu;
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)
170 irq_link(data->irq);
171 leon_unmask_irq(data);
172 return 0;
175 static void leon_shutdown_irq(struct irq_data *data)
177 leon_mask_irq(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 = {
191 .name = "leon",
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)
210 unsigned int irq;
211 unsigned long mask;
213 irq = 0;
214 mask = get_irqmask(real_irq);
215 if (mask == 0)
216 goto out;
218 irq = irq_alloc(real_irq, real_irq);
219 if (irq == 0)
220 goto out;
222 if (do_ack)
223 mask |= LEON_DO_ACK_HW;
225 irq_set_chip_and_handler_name(irq, &leon_irq,
226 flow_handler, name);
227 irq_set_chip_data(irq, (void *)mask);
229 out:
230 return irq;
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 leon_update_virq_handling(unsigned int virq,
240 irq_flow_handler_t flow_handler,
241 const char *name, int do_ack)
243 unsigned long mask = (unsigned long)irq_get_chip_data(virq);
245 mask &= ~LEON_DO_ACK_HW;
246 if (do_ack)
247 mask |= LEON_DO_ACK_HW;
249 irq_set_chip_and_handler_name(virq, &leon_irq,
250 flow_handler, name);
251 irq_set_chip_data(virq, (void *)mask);
254 void __init leon_init_timers(irq_handler_t counter_fn)
256 int irq, eirq;
257 struct device_node *rootnp, *np, *nnp;
258 struct property *pp;
259 int len;
260 int icsel;
261 int ampopts;
262 int err;
264 leondebug_irq_disable = 0;
265 leon_debug_irqout = 0;
266 master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
267 dummy_master_l10_counter = 0;
269 rootnp = of_find_node_by_path("/ambapp0");
270 if (!rootnp)
271 goto bad;
273 /* Find System ID: GRLIB build ID and optional CHIP ID */
274 pp = of_find_property(rootnp, "systemid", &len);
275 if (pp)
276 amba_system_id = *(unsigned long *)pp->value;
278 /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
279 np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
280 if (!np) {
281 np = of_find_node_by_name(rootnp, "01_00d");
282 if (!np)
283 goto bad;
285 pp = of_find_property(np, "reg", &len);
286 if (!pp)
287 goto bad;
288 leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
290 /* Find GPTIMER Timer Registers base address otherwise bail out. */
291 nnp = rootnp;
292 do {
293 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
294 if (!np) {
295 np = of_find_node_by_name(nnp, "01_011");
296 if (!np)
297 goto bad;
300 ampopts = 0;
301 pp = of_find_property(np, "ampopts", &len);
302 if (pp) {
303 ampopts = *(int *)pp->value;
304 if (ampopts == 0) {
305 /* Skip this instance, resource already
306 * allocated by other OS */
307 nnp = np;
308 continue;
312 /* Select Timer-Instance on Timer Core. Default is zero */
313 leon3_gptimer_idx = ampopts & 0x7;
315 pp = of_find_property(np, "reg", &len);
316 if (pp)
317 leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
318 pp->value;
319 pp = of_find_property(np, "interrupts", &len);
320 if (pp)
321 leon3_gptimer_irq = *(unsigned int *)pp->value;
322 } while (0);
324 if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
325 goto bad;
327 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
328 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
329 (((1000000 / HZ) - 1)));
330 LEON3_BYPASS_STORE_PA(
331 &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
333 #ifdef CONFIG_SMP
334 leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
336 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
337 (1<<LEON3_GPTIMER_SEPIRQ))) {
338 printk(KERN_ERR "timer not configured with separate irqs\n");
339 BUG();
342 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val,
344 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
345 (((1000000/HZ) - 1)));
346 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
348 #endif
351 * The IRQ controller may (if implemented) consist of multiple
352 * IRQ controllers, each mapped on a 4Kb boundary.
353 * Each CPU may be routed to different IRQCTRLs, however
354 * we assume that all CPUs (in SMP system) is routed to the
355 * same IRQ Controller, and for non-SMP only one IRQCTRL is
356 * accessed anyway.
357 * In AMP systems, Linux must run on CPU0 for the time being.
359 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]);
360 icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf;
361 leon3_irqctrl_regs += icsel;
363 /* Mask all IRQs on boot-cpu IRQ controller */
364 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0);
366 /* Probe extended IRQ controller */
367 eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
368 >> 16) & 0xf;
369 if (eirq != 0)
370 leon_eirq_setup(eirq);
372 irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx);
373 err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL);
374 if (err) {
375 printk(KERN_ERR "unable to attach timer IRQ%d\n", irq);
376 prom_halt();
379 #ifdef CONFIG_SMP
381 unsigned long flags;
384 * In SMP, sun4m adds a IPI handler to IRQ trap handler that
385 * LEON never must take, sun4d and LEON overwrites the branch
386 * with a NOP.
388 local_irq_save(flags);
389 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
390 local_flush_cache_all();
391 local_irq_restore(flags);
393 #endif
395 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
396 LEON3_GPTIMER_EN |
397 LEON3_GPTIMER_RL |
398 LEON3_GPTIMER_LD |
399 LEON3_GPTIMER_IRQEN);
401 #ifdef CONFIG_SMP
402 /* Install per-cpu IRQ handler for broadcasted ticker */
403 irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq,
404 "per-cpu", 0);
405 err = request_irq(irq, leon_percpu_timer_interrupt,
406 IRQF_PERCPU | IRQF_TIMER, "ticker",
407 NULL);
408 if (err) {
409 printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
410 prom_halt();
413 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
414 LEON3_GPTIMER_EN |
415 LEON3_GPTIMER_RL |
416 LEON3_GPTIMER_LD |
417 LEON3_GPTIMER_IRQEN);
418 #endif
419 return;
420 bad:
421 printk(KERN_ERR "No Timer/irqctrl found\n");
422 BUG();
423 return;
426 void leon_clear_clock_irq(void)
430 void leon_load_profile_irq(int cpu, unsigned int limit)
432 BUG();
435 void __init leon_trans_init(struct device_node *dp)
437 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
438 struct property *p;
439 p = of_find_property(dp, "mid", (void *)0);
440 if (p) {
441 int mid;
442 dp->name = prom_early_alloc(5 + 1);
443 memcpy(&mid, p->value, p->length);
444 sprintf((char *)dp->name, "cpu%.2d", mid);
449 void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;
451 void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
453 if (prom_amba_init &&
454 strcmp(dp->type, "ambapp") == 0 &&
455 strcmp(dp->name, "ambapp0") == 0) {
456 prom_amba_init(dp, nextp);
460 #ifdef CONFIG_SMP
462 void leon_set_cpu_int(int cpu, int level)
464 unsigned long mask;
465 mask = get_irqmask(level);
466 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
469 static void leon_clear_ipi(int cpu, int level)
471 unsigned long mask;
472 mask = get_irqmask(level);
473 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
476 static void leon_set_udt(int cpu)
480 void leon_clear_profile_irq(int cpu)
484 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
486 unsigned long mask, flags, *addr;
487 mask = get_irqmask(irq_nr);
488 spin_lock_irqsave(&leon_irq_lock, flags);
489 addr = (unsigned long *)LEON_IMASK(cpu);
490 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));
491 spin_unlock_irqrestore(&leon_irq_lock, flags);
494 #endif
496 void __init leon_init_IRQ(void)
498 sparc_irq_config.init_timers = leon_init_timers;
499 sparc_irq_config.build_device_irq = _leon_build_device_irq;
501 BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq,
502 BTFIXUPCALL_NORM);
503 BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq,
504 BTFIXUPCALL_NOP);
506 #ifdef CONFIG_SMP
507 BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM);
508 BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM);
509 BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM);
510 #endif
514 void __init leon_init(void)
516 of_pdt_build_more = &leon_node_init;