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Linux/arch/sparc/kernel/leon_kernel.c

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  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  */
  5 
  6 #include <linux/kernel.h>
  7 #include <linux/errno.h>
  8 #include <linux/mutex.h>
  9 #include <linux/of.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>
 15 
 16 #include <asm/oplib.h>
 17 #include <asm/timer.h>
 18 #include <asm/prom.h>
 19 #include <asm/leon.h>
 20 #include <asm/leon_amba.h>
 21 #include <asm/traps.h>
 22 #include <asm/cacheflush.h>
 23 #include <asm/smp.h>
 24 #include <asm/setup.h>
 25 
 26 #include "kernel.h"
 27 #include "prom.h"
 28 #include "irq.h"
 29 
 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 */
 32 
 33 int leondebug_irq_disable;
 34 int leon_debug_irqout;
 35 static volatile u32 dummy_master_l10_counter;
 36 unsigned long amba_system_id;
 37 static DEFINE_SPINLOCK(leon_irq_lock);
 38 
 39 static unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
 40 static unsigned long leon3_gptimer_ackmask; /* For clearing pending bit */
 41 unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
 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
 46 
 47 /* Return the last ACKed IRQ by the Extended IRQ controller. It has already
 48  * been (automatically) ACKed when the CPU takes the trap.
 49  */
 50 static inline unsigned int leon_eirq_get(int cpu)
 51 {
 52         return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
 53 }
 54 
 55 /* Handle one or multiple IRQs from the extended interrupt controller */
 56 static void leon_handle_ext_irq(struct irq_desc *desc)
 57 {
 58         unsigned int eirq;
 59         struct irq_bucket *p;
 60         int cpu = sparc_leon3_cpuid();
 61 
 62         eirq = leon_eirq_get(cpu);
 63         p = irq_map[eirq];
 64         if ((eirq & 0x10) && p && p->irq) /* bit4 tells if IRQ happened */
 65                 generic_handle_irq(p->irq);
 66 }
 67 
 68 /* The extended IRQ controller has been found, this function registers it */
 69 static void leon_eirq_setup(unsigned int eirq)
 70 {
 71         unsigned long mask, oldmask;
 72         unsigned int veirq;
 73 
 74         if (eirq < 1 || eirq > 0xf) {
 75                 printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);
 76                 return;
 77         }
 78 
 79         veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0);
 80 
 81         /*
 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.
 84          */
 85         irq_link(veirq);
 86         mask = 1 << eirq;
 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;
 90 }
 91 
 92 unsigned long leon_get_irqmask(unsigned int irq)
 93 {
 94         unsigned long mask;
 95 
 96         if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
 97             || ((irq > 0x1f) && sparc_leon_eirq)) {
 98                 printk(KERN_ERR
 99                        "leon_get_irqmask: false irq number: %d\n", irq);
100                 mask = 0;
101         } else {
102                 mask = LEON_HARD_INT(irq);
103         }
104         return mask;
105 }
106 
107 #ifdef CONFIG_SMP
108 static int irq_choose_cpu(const struct cpumask *affinity)
109 {
110         cpumask_t mask;
111 
112         cpumask_and(&mask, cpu_online_mask, affinity);
113         if (cpumask_equal(&mask, cpu_online_mask) || cpumask_empty(&mask))
114                 return boot_cpu_id;
115         else
116                 return cpumask_first(&mask);
117 }
118 #else
119 #define irq_choose_cpu(affinity) boot_cpu_id
120 #endif
121 
122 static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest,
123                              bool force)
124 {
125         unsigned long mask, oldmask, flags;
126         int oldcpu, newcpu;
127 
128         mask = (unsigned long)data->chip_data;
129         oldcpu = irq_choose_cpu(irq_data_get_affinity_mask(data));
130         newcpu = irq_choose_cpu(dest);
131 
132         if (oldcpu == newcpu)
133                 goto out;
134 
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);
142 out:
143         return IRQ_SET_MASK_OK;
144 }
145 
146 static void leon_unmask_irq(struct irq_data *data)
147 {
148         unsigned long mask, oldmask, flags;
149         int cpu;
150 
151         mask = (unsigned long)data->chip_data;
152         cpu = irq_choose_cpu(irq_data_get_affinity_mask(data));
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);
157 }
158 
159 static void leon_mask_irq(struct irq_data *data)
160 {
161         unsigned long mask, oldmask, flags;
162         int cpu;
163 
164         mask = (unsigned long)data->chip_data;
165         cpu = irq_choose_cpu(irq_data_get_affinity_mask(data));
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);
170 }
171 
172 static unsigned int leon_startup_irq(struct irq_data *data)
173 {
174         irq_link(data->irq);
175         leon_unmask_irq(data);
176         return 0;
177 }
178 
179 static void leon_shutdown_irq(struct irq_data *data)
180 {
181         leon_mask_irq(data);
182         irq_unlink(data->irq);
183 }
184 
185 /* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */
186 static void leon_eoi_irq(struct irq_data *data)
187 {
188         unsigned long mask = (unsigned long)data->chip_data;
189 
190         if (mask & LEON_DO_ACK_HW)
191                 LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);
192 }
193 
194 static struct irq_chip leon_irq = {
195         .name                   = "leon",
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,
202 };
203 
204 /*
205  * Build a LEON IRQ for the edge triggered LEON IRQ controller:
206  *  Edge (normal) IRQ           - handle_simple_irq, ack=DON'T-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
209  */
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)
213 {
214         unsigned int irq;
215         unsigned long mask;
216         struct irq_desc *desc;
217 
218         irq = 0;
219         mask = leon_get_irqmask(real_irq);
220         if (mask == 0)
221                 goto out;
222 
223         irq = irq_alloc(real_irq, real_irq);
224         if (irq == 0)
225                 goto out;
226 
227         if (do_ack)
228                 mask |= LEON_DO_ACK_HW;
229 
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,
233                                               flow_handler, name);
234                 irq_set_chip_data(irq, (void *)mask);
235         }
236 
237 out:
238         return irq;
239 }
240 
241 static unsigned int _leon_build_device_irq(struct platform_device *op,
242                                            unsigned int real_irq)
243 {
244         return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);
245 }
246 
247 void leon_update_virq_handling(unsigned int virq,
248                               irq_flow_handler_t flow_handler,
249                               const char *name, int do_ack)
250 {
251         unsigned long mask = (unsigned long)irq_get_chip_data(virq);
252 
253         mask &= ~LEON_DO_ACK_HW;
254         if (do_ack)
255                 mask |= LEON_DO_ACK_HW;
256 
257         irq_set_chip_and_handler_name(virq, &leon_irq,
258                                       flow_handler, name);
259         irq_set_chip_data(virq, (void *)mask);
260 }
261 
262 static u32 leon_cycles_offset(void)
263 {
264         u32 rld, val, ctrl, off;
265 
266         rld = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld);
267         val = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val);
268         ctrl = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl);
269         if (LEON3_GPTIMER_CTRL_ISPENDING(ctrl)) {
270                 val = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val);
271                 off = 2 * rld - val;
272         } else {
273                 off = rld - val;
274         }
275 
276         return off;
277 }
278 
279 #ifdef CONFIG_SMP
280 
281 /* smp clockevent irq */
282 static irqreturn_t leon_percpu_timer_ce_interrupt(int irq, void *unused)
283 {
284         struct clock_event_device *ce;
285         int cpu = smp_processor_id();
286 
287         leon_clear_profile_irq(cpu);
288 
289         if (cpu == boot_cpu_id)
290                 timer_interrupt(irq, NULL);
291 
292         ce = &per_cpu(sparc32_clockevent, cpu);
293 
294         irq_enter();
295         if (ce->event_handler)
296                 ce->event_handler(ce);
297         irq_exit();
298 
299         return IRQ_HANDLED;
300 }
301 
302 #endif /* CONFIG_SMP */
303 
304 void __init leon_init_timers(void)
305 {
306         int irq, eirq;
307         struct device_node *rootnp, *np, *nnp;
308         struct property *pp;
309         int len;
310         int icsel;
311         int ampopts;
312         int err;
313         u32 config;
314         u32 ctrl;
315 
316         sparc_config.get_cycles_offset = leon_cycles_offset;
317         sparc_config.cs_period = 1000000 / HZ;
318         sparc_config.features |= FEAT_L10_CLOCKSOURCE;
319 
320 #ifndef CONFIG_SMP
321         sparc_config.features |= FEAT_L10_CLOCKEVENT;
322 #endif
323 
324         leondebug_irq_disable = 0;
325         leon_debug_irqout = 0;
326         master_l10_counter = (u32 __iomem *)&dummy_master_l10_counter;
327         dummy_master_l10_counter = 0;
328 
329         rootnp = of_find_node_by_path("/ambapp0");
330         if (!rootnp)
331                 goto bad;
332 
333         /* Find System ID: GRLIB build ID and optional CHIP ID */
334         pp = of_find_property(rootnp, "systemid", &len);
335         if (pp)
336                 amba_system_id = *(unsigned long *)pp->value;
337 
338         /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
339         np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
340         if (!np) {
341                 np = of_find_node_by_name(rootnp, "01_00d");
342                 if (!np)
343                         goto bad;
344         }
345         pp = of_find_property(np, "reg", &len);
346         if (!pp)
347                 goto bad;
348         leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
349 
350         /* Find GPTIMER Timer Registers base address otherwise bail out. */
351         nnp = rootnp;
352         do {
353                 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
354                 if (!np) {
355                         np = of_find_node_by_name(nnp, "01_011");
356                         if (!np)
357                                 goto bad;
358                 }
359 
360                 ampopts = 0;
361                 pp = of_find_property(np, "ampopts", &len);
362                 if (pp) {
363                         ampopts = *(int *)pp->value;
364                         if (ampopts == 0) {
365                                 /* Skip this instance, resource already
366                                  * allocated by other OS */
367                                 nnp = np;
368                                 continue;
369                         }
370                 }
371 
372                 /* Select Timer-Instance on Timer Core. Default is zero */
373                 leon3_gptimer_idx = ampopts & 0x7;
374 
375                 pp = of_find_property(np, "reg", &len);
376                 if (pp)
377                         leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
378                                                 pp->value;
379                 pp = of_find_property(np, "interrupts", &len);
380                 if (pp)
381                         leon3_gptimer_irq = *(unsigned int *)pp->value;
382         } while (0);
383 
384         if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
385                 goto bad;
386 
387         ctrl = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl);
388         LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
389                               ctrl | LEON3_GPTIMER_CTRL_PENDING);
390         ctrl = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl);
391 
392         if ((ctrl & LEON3_GPTIMER_CTRL_PENDING) != 0)
393                 leon3_gptimer_ackmask = ~LEON3_GPTIMER_CTRL_PENDING;
394         else
395                 leon3_gptimer_ackmask = ~0;
396 
397         LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
398         LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
399                                 (((1000000 / HZ) - 1)));
400         LEON3_BYPASS_STORE_PA(
401                         &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
402 
403         /*
404          * The IRQ controller may (if implemented) consist of multiple
405          * IRQ controllers, each mapped on a 4Kb boundary.
406          * Each CPU may be routed to different IRQCTRLs, however
407          * we assume that all CPUs (in SMP system) is routed to the
408          * same IRQ Controller, and for non-SMP only one IRQCTRL is
409          * accessed anyway.
410          * In AMP systems, Linux must run on CPU0 for the time being.
411          */
412         icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]);
413         icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf;
414         leon3_irqctrl_regs += icsel;
415 
416         /* Mask all IRQs on boot-cpu IRQ controller */
417         LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0);
418 
419         /* Probe extended IRQ controller */
420         eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
421                 >> 16) & 0xf;
422         if (eirq != 0)
423                 leon_eirq_setup(eirq);
424 
425 #ifdef CONFIG_SMP
426         {
427                 unsigned long flags;
428 
429                 /*
430                  * In SMP, sun4m adds a IPI handler to IRQ trap handler that
431                  * LEON never must take, sun4d and LEON overwrites the branch
432                  * with a NOP.
433                  */
434                 local_irq_save(flags);
435                 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
436                 local_ops->cache_all();
437                 local_irq_restore(flags);
438         }
439 #endif
440 
441         config = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config);
442         if (config & (1 << LEON3_GPTIMER_SEPIRQ))
443                 leon3_gptimer_irq += leon3_gptimer_idx;
444         else if ((config & LEON3_GPTIMER_TIMERS) > 1)
445                 pr_warn("GPTIMER uses shared irqs, using other timers of the same core will fail.\n");
446 
447 #ifdef CONFIG_SMP
448         /* Install per-cpu IRQ handler for broadcasted ticker */
449         irq = leon_build_device_irq(leon3_gptimer_irq, handle_percpu_irq,
450                                     "per-cpu", 0);
451         err = request_irq(irq, leon_percpu_timer_ce_interrupt,
452                           IRQF_PERCPU | IRQF_TIMER, "timer", NULL);
453 #else
454         irq = _leon_build_device_irq(NULL, leon3_gptimer_irq);
455         err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL);
456 #endif
457         if (err) {
458                 pr_err("Unable to attach timer IRQ%d\n", irq);
459                 prom_halt();
460         }
461         LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
462                               LEON3_GPTIMER_EN |
463                               LEON3_GPTIMER_RL |
464                               LEON3_GPTIMER_LD |
465                               LEON3_GPTIMER_IRQEN);
466         return;
467 bad:
468         printk(KERN_ERR "No Timer/irqctrl found\n");
469         BUG();
470         return;
471 }
472 
473 static void leon_clear_clock_irq(void)
474 {
475         u32 ctrl;
476 
477         ctrl = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl);
478         LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
479                               ctrl & leon3_gptimer_ackmask);
480 }
481 
482 static void leon_load_profile_irq(int cpu, unsigned int limit)
483 {
484 }
485 
486 void __init leon_trans_init(struct device_node *dp)
487 {
488         if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
489                 struct property *p;
490                 p = of_find_property(dp, "mid", (void *)0);
491                 if (p) {
492                         int mid;
493                         dp->name = prom_early_alloc(5 + 1);
494                         memcpy(&mid, p->value, p->length);
495                         sprintf((char *)dp->name, "cpu%.2d", mid);
496                 }
497         }
498 }
499 
500 #ifdef CONFIG_SMP
501 void leon_clear_profile_irq(int cpu)
502 {
503 }
504 
505 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
506 {
507         unsigned long mask, flags, *addr;
508         mask = leon_get_irqmask(irq_nr);
509         spin_lock_irqsave(&leon_irq_lock, flags);
510         addr = (unsigned long *)LEON_IMASK(cpu);
511         LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));
512         spin_unlock_irqrestore(&leon_irq_lock, flags);
513 }
514 
515 #endif
516 
517 void __init leon_init_IRQ(void)
518 {
519         sparc_config.init_timers      = leon_init_timers;
520         sparc_config.build_device_irq = _leon_build_device_irq;
521         sparc_config.clock_rate       = 1000000;
522         sparc_config.clear_clock_irq  = leon_clear_clock_irq;
523         sparc_config.load_profile_irq = leon_load_profile_irq;
524 }
525 

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