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 int dummy_master_l10_counter; 36 unsigned long amba_system_id; 37 static DEFINE_SPINLOCK(leon_irq_lock); 38 39 unsigned long leon3_gptimer_irq; /* interrupt controller irq number */ 40 unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */ 41 int leon3_ticker_irq; /* Timer ticker IRQ */ 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(unsigned int 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 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(data->affinity); 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(data->affinity); 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(data->affinity); 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=DONT-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, off; 265 rld = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld); 266 val = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val); 267 off = rld - val; 268 return rld - val; 269 } 270 271 #ifdef CONFIG_SMP 272 273 /* smp clockevent irq */ 274 irqreturn_t leon_percpu_timer_ce_interrupt(int irq, void *unused) 275 { 276 struct clock_event_device *ce; 277 int cpu = smp_processor_id(); 278 279 leon_clear_profile_irq(cpu); 280 281 ce = &per_cpu(sparc32_clockevent, cpu); 282 283 irq_enter(); 284 if (ce->event_handler) 285 ce->event_handler(ce); 286 irq_exit(); 287 288 return IRQ_HANDLED; 289 } 290 291 #endif /* CONFIG_SMP */ 292 293 void __init leon_init_timers(void) 294 { 295 int irq, eirq; 296 struct device_node *rootnp, *np, *nnp; 297 struct property *pp; 298 int len; 299 int icsel; 300 int ampopts; 301 int err; 302 303 sparc_config.get_cycles_offset = leon_cycles_offset; 304 sparc_config.cs_period = 1000000 / HZ; 305 sparc_config.features |= FEAT_L10_CLOCKSOURCE; 306 307 #ifndef CONFIG_SMP 308 sparc_config.features |= FEAT_L10_CLOCKEVENT; 309 #endif 310 311 leondebug_irq_disable = 0; 312 leon_debug_irqout = 0; 313 master_l10_counter = (unsigned int *)&dummy_master_l10_counter; 314 dummy_master_l10_counter = 0; 315 316 rootnp = of_find_node_by_path("/ambapp0"); 317 if (!rootnp) 318 goto bad; 319 320 /* Find System ID: GRLIB build ID and optional CHIP ID */ 321 pp = of_find_property(rootnp, "systemid", &len); 322 if (pp) 323 amba_system_id = *(unsigned long *)pp->value; 324 325 /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */ 326 np = of_find_node_by_name(rootnp, "GAISLER_IRQMP"); 327 if (!np) { 328 np = of_find_node_by_name(rootnp, "01_00d"); 329 if (!np) 330 goto bad; 331 } 332 pp = of_find_property(np, "reg", &len); 333 if (!pp) 334 goto bad; 335 leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value; 336 337 /* Find GPTIMER Timer Registers base address otherwise bail out. */ 338 nnp = rootnp; 339 do { 340 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER"); 341 if (!np) { 342 np = of_find_node_by_name(nnp, "01_011"); 343 if (!np) 344 goto bad; 345 } 346 347 ampopts = 0; 348 pp = of_find_property(np, "ampopts", &len); 349 if (pp) { 350 ampopts = *(int *)pp->value; 351 if (ampopts == 0) { 352 /* Skip this instance, resource already 353 * allocated by other OS */ 354 nnp = np; 355 continue; 356 } 357 } 358 359 /* Select Timer-Instance on Timer Core. Default is zero */ 360 leon3_gptimer_idx = ampopts & 0x7; 361 362 pp = of_find_property(np, "reg", &len); 363 if (pp) 364 leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **) 365 pp->value; 366 pp = of_find_property(np, "interrupts", &len); 367 if (pp) 368 leon3_gptimer_irq = *(unsigned int *)pp->value; 369 } while (0); 370 371 if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq)) 372 goto bad; 373 374 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0); 375 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld, 376 (((1000000 / HZ) - 1))); 377 LEON3_BYPASS_STORE_PA( 378 &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0); 379 380 #ifdef CONFIG_SMP 381 leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx; 382 383 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) & 384 (1<<LEON3_GPTIMER_SEPIRQ))) { 385 printk(KERN_ERR "timer not configured with separate irqs\n"); 386 BUG(); 387 } 388 389 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val, 390 0); 391 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld, 392 (((1000000/HZ) - 1))); 393 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 394 0); 395 #endif 396 397 /* 398 * The IRQ controller may (if implemented) consist of multiple 399 * IRQ controllers, each mapped on a 4Kb boundary. 400 * Each CPU may be routed to different IRQCTRLs, however 401 * we assume that all CPUs (in SMP system) is routed to the 402 * same IRQ Controller, and for non-SMP only one IRQCTRL is 403 * accessed anyway. 404 * In AMP systems, Linux must run on CPU0 for the time being. 405 */ 406 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]); 407 icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf; 408 leon3_irqctrl_regs += icsel; 409 410 /* Mask all IRQs on boot-cpu IRQ controller */ 411 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0); 412 413 /* Probe extended IRQ controller */ 414 eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus) 415 >> 16) & 0xf; 416 if (eirq != 0) 417 leon_eirq_setup(eirq); 418 419 irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx); 420 err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL); 421 if (err) { 422 printk(KERN_ERR "unable to attach timer IRQ%d\n", irq); 423 prom_halt(); 424 } 425 426 #ifdef CONFIG_SMP 427 { 428 unsigned long flags; 429 430 /* 431 * In SMP, sun4m adds a IPI handler to IRQ trap handler that 432 * LEON never must take, sun4d and LEON overwrites the branch 433 * with a NOP. 434 */ 435 local_irq_save(flags); 436 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */ 437 local_ops->cache_all(); 438 local_irq_restore(flags); 439 } 440 #endif 441 442 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 443 LEON3_GPTIMER_EN | 444 LEON3_GPTIMER_RL | 445 LEON3_GPTIMER_LD | 446 LEON3_GPTIMER_IRQEN); 447 448 #ifdef CONFIG_SMP 449 /* Install per-cpu IRQ handler for broadcasted ticker */ 450 irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq, 451 "per-cpu", 0); 452 err = request_irq(irq, leon_percpu_timer_ce_interrupt, 453 IRQF_PERCPU | IRQF_TIMER, "ticker", 454 NULL); 455 if (err) { 456 printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq); 457 prom_halt(); 458 } 459 460 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 461 LEON3_GPTIMER_EN | 462 LEON3_GPTIMER_RL | 463 LEON3_GPTIMER_LD | 464 LEON3_GPTIMER_IRQEN); 465 #endif 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 } 476 477 static void leon_load_profile_irq(int cpu, unsigned int limit) 478 { 479 } 480 481 void __init leon_trans_init(struct device_node *dp) 482 { 483 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) { 484 struct property *p; 485 p = of_find_property(dp, "mid", (void *)0); 486 if (p) { 487 int mid; 488 dp->name = prom_early_alloc(5 + 1); 489 memcpy(&mid, p->value, p->length); 490 sprintf((char *)dp->name, "cpu%.2d", mid); 491 } 492 } 493 } 494 495 #ifdef CONFIG_SMP 496 void leon_clear_profile_irq(int cpu) 497 { 498 } 499 500 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu) 501 { 502 unsigned long mask, flags, *addr; 503 mask = leon_get_irqmask(irq_nr); 504 spin_lock_irqsave(&leon_irq_lock, flags); 505 addr = (unsigned long *)LEON_IMASK(cpu); 506 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask)); 507 spin_unlock_irqrestore(&leon_irq_lock, flags); 508 } 509 510 #endif 511 512 void __init leon_init_IRQ(void) 513 { 514 sparc_config.init_timers = leon_init_timers; 515 sparc_config.build_device_irq = _leon_build_device_irq; 516 sparc_config.clock_rate = 1000000; 517 sparc_config.clear_clock_irq = leon_clear_clock_irq; 518 sparc_config.load_profile_irq = leon_load_profile_irq; 519 } 520