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 "prom.h" 27 #include "irq.h" 28 29 struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */ 30 struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */ 31 32 int leondebug_irq_disable; 33 int leon_debug_irqout; 34 static int dummy_master_l10_counter; 35 unsigned long amba_system_id; 36 static DEFINE_SPINLOCK(leon_irq_lock); 37 38 unsigned long leon3_gptimer_irq; /* interrupt controller irq number */ 39 unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */ 40 int leon3_ticker_irq; /* Timer ticker IRQ */ 41 unsigned int sparc_leon_eirq; 42 #define LEON_IMASK(cpu) (&leon3_irqctrl_regs->mask[cpu]) 43 #define LEON_IACK (&leon3_irqctrl_regs->iclear) 44 #define LEON_DO_ACK_HW 1 45 46 /* Return the last ACKed IRQ by the Extended IRQ controller. It has already 47 * been (automatically) ACKed when the CPU takes the trap. 48 */ 49 static inline unsigned int leon_eirq_get(int cpu) 50 { 51 return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f; 52 } 53 54 /* Handle one or multiple IRQs from the extended interrupt controller */ 55 static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc) 56 { 57 unsigned int eirq; 58 int cpu = sparc_leon3_cpuid(); 59 60 eirq = leon_eirq_get(cpu); 61 if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */ 62 generic_handle_irq(irq_map[eirq]->irq); 63 } 64 65 /* The extended IRQ controller has been found, this function registers it */ 66 void leon_eirq_setup(unsigned int eirq) 67 { 68 unsigned long mask, oldmask; 69 unsigned int veirq; 70 71 if (eirq < 1 || eirq > 0xf) { 72 printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq); 73 return; 74 } 75 76 veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0); 77 78 /* 79 * Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ 80 * controller have a mask-bit of their own, so this is safe. 81 */ 82 irq_link(veirq); 83 mask = 1 << eirq; 84 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id)); 85 LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask | mask)); 86 sparc_leon_eirq = eirq; 87 } 88 89 unsigned long leon_get_irqmask(unsigned int irq) 90 { 91 unsigned long mask; 92 93 if (!irq || ((irq > 0xf) && !sparc_leon_eirq) 94 || ((irq > 0x1f) && sparc_leon_eirq)) { 95 printk(KERN_ERR 96 "leon_get_irqmask: false irq number: %d\n", irq); 97 mask = 0; 98 } else { 99 mask = LEON_HARD_INT(irq); 100 } 101 return mask; 102 } 103 104 #ifdef CONFIG_SMP 105 static int irq_choose_cpu(const struct cpumask *affinity) 106 { 107 cpumask_t mask; 108 109 cpumask_and(&mask, cpu_online_mask, affinity); 110 if (cpumask_equal(&mask, cpu_online_mask) || cpumask_empty(&mask)) 111 return boot_cpu_id; 112 else 113 return cpumask_first(&mask); 114 } 115 #else 116 #define irq_choose_cpu(affinity) boot_cpu_id 117 #endif 118 119 static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest, 120 bool force) 121 { 122 unsigned long mask, oldmask, flags; 123 int oldcpu, newcpu; 124 125 mask = (unsigned long)data->chip_data; 126 oldcpu = irq_choose_cpu(data->affinity); 127 newcpu = irq_choose_cpu(dest); 128 129 if (oldcpu == newcpu) 130 goto out; 131 132 /* unmask on old CPU first before enabling on the selected CPU */ 133 spin_lock_irqsave(&leon_irq_lock, flags); 134 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(oldcpu)); 135 LEON3_BYPASS_STORE_PA(LEON_IMASK(oldcpu), (oldmask & ~mask)); 136 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(newcpu)); 137 LEON3_BYPASS_STORE_PA(LEON_IMASK(newcpu), (oldmask | mask)); 138 spin_unlock_irqrestore(&leon_irq_lock, flags); 139 out: 140 return IRQ_SET_MASK_OK; 141 } 142 143 static void leon_unmask_irq(struct irq_data *data) 144 { 145 unsigned long mask, oldmask, flags; 146 int cpu; 147 148 mask = (unsigned long)data->chip_data; 149 cpu = irq_choose_cpu(data->affinity); 150 spin_lock_irqsave(&leon_irq_lock, flags); 151 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu)); 152 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask | mask)); 153 spin_unlock_irqrestore(&leon_irq_lock, flags); 154 } 155 156 static void leon_mask_irq(struct irq_data *data) 157 { 158 unsigned long mask, oldmask, flags; 159 int cpu; 160 161 mask = (unsigned long)data->chip_data; 162 cpu = irq_choose_cpu(data->affinity); 163 spin_lock_irqsave(&leon_irq_lock, flags); 164 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu)); 165 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask & ~mask)); 166 spin_unlock_irqrestore(&leon_irq_lock, flags); 167 } 168 169 static unsigned int leon_startup_irq(struct irq_data *data) 170 { 171 irq_link(data->irq); 172 leon_unmask_irq(data); 173 return 0; 174 } 175 176 static void leon_shutdown_irq(struct irq_data *data) 177 { 178 leon_mask_irq(data); 179 irq_unlink(data->irq); 180 } 181 182 /* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */ 183 static void leon_eoi_irq(struct irq_data *data) 184 { 185 unsigned long mask = (unsigned long)data->chip_data; 186 187 if (mask & LEON_DO_ACK_HW) 188 LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW); 189 } 190 191 static struct irq_chip leon_irq = { 192 .name = "leon", 193 .irq_startup = leon_startup_irq, 194 .irq_shutdown = leon_shutdown_irq, 195 .irq_mask = leon_mask_irq, 196 .irq_unmask = leon_unmask_irq, 197 .irq_eoi = leon_eoi_irq, 198 .irq_set_affinity = leon_set_affinity, 199 }; 200 201 /* 202 * Build a LEON IRQ for the edge triggered LEON IRQ controller: 203 * Edge (normal) IRQ - handle_simple_irq, ack=DONT-CARE, never ack 204 * Level IRQ (PCI|Level-GPIO) - handle_fasteoi_irq, ack=1, ack after ISR 205 * Per-CPU Edge - handle_percpu_irq, ack=0 206 */ 207 unsigned int leon_build_device_irq(unsigned int real_irq, 208 irq_flow_handler_t flow_handler, 209 const char *name, int do_ack) 210 { 211 unsigned int irq; 212 unsigned long mask; 213 214 irq = 0; 215 mask = leon_get_irqmask(real_irq); 216 if (mask == 0) 217 goto out; 218 219 irq = irq_alloc(real_irq, real_irq); 220 if (irq == 0) 221 goto out; 222 223 if (do_ack) 224 mask |= LEON_DO_ACK_HW; 225 226 irq_set_chip_and_handler_name(irq, &leon_irq, 227 flow_handler, name); 228 irq_set_chip_data(irq, (void *)mask); 229 230 out: 231 return irq; 232 } 233 234 static unsigned int _leon_build_device_irq(struct platform_device *op, 235 unsigned int real_irq) 236 { 237 return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0); 238 } 239 240 void leon_update_virq_handling(unsigned int virq, 241 irq_flow_handler_t flow_handler, 242 const char *name, int do_ack) 243 { 244 unsigned long mask = (unsigned long)irq_get_chip_data(virq); 245 246 mask &= ~LEON_DO_ACK_HW; 247 if (do_ack) 248 mask |= LEON_DO_ACK_HW; 249 250 irq_set_chip_and_handler_name(virq, &leon_irq, 251 flow_handler, name); 252 irq_set_chip_data(virq, (void *)mask); 253 } 254 255 static u32 leon_cycles_offset(void) 256 { 257 u32 rld, val, off; 258 rld = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld); 259 val = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val); 260 off = rld - val; 261 return rld - val; 262 } 263 264 #ifdef CONFIG_SMP 265 266 /* smp clockevent irq */ 267 irqreturn_t leon_percpu_timer_ce_interrupt(int irq, void *unused) 268 { 269 struct clock_event_device *ce; 270 int cpu = smp_processor_id(); 271 272 leon_clear_profile_irq(cpu); 273 274 ce = &per_cpu(sparc32_clockevent, cpu); 275 276 irq_enter(); 277 if (ce->event_handler) 278 ce->event_handler(ce); 279 irq_exit(); 280 281 return IRQ_HANDLED; 282 } 283 284 #endif /* CONFIG_SMP */ 285 286 void __init leon_init_timers(void) 287 { 288 int irq, eirq; 289 struct device_node *rootnp, *np, *nnp; 290 struct property *pp; 291 int len; 292 int icsel; 293 int ampopts; 294 int err; 295 296 sparc_config.get_cycles_offset = leon_cycles_offset; 297 sparc_config.cs_period = 1000000 / HZ; 298 sparc_config.features |= FEAT_L10_CLOCKSOURCE; 299 300 #ifndef CONFIG_SMP 301 sparc_config.features |= FEAT_L10_CLOCKEVENT; 302 #endif 303 304 leondebug_irq_disable = 0; 305 leon_debug_irqout = 0; 306 master_l10_counter = (unsigned int *)&dummy_master_l10_counter; 307 dummy_master_l10_counter = 0; 308 309 rootnp = of_find_node_by_path("/ambapp0"); 310 if (!rootnp) 311 goto bad; 312 313 /* Find System ID: GRLIB build ID and optional CHIP ID */ 314 pp = of_find_property(rootnp, "systemid", &len); 315 if (pp) 316 amba_system_id = *(unsigned long *)pp->value; 317 318 /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */ 319 np = of_find_node_by_name(rootnp, "GAISLER_IRQMP"); 320 if (!np) { 321 np = of_find_node_by_name(rootnp, "01_00d"); 322 if (!np) 323 goto bad; 324 } 325 pp = of_find_property(np, "reg", &len); 326 if (!pp) 327 goto bad; 328 leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value; 329 330 /* Find GPTIMER Timer Registers base address otherwise bail out. */ 331 nnp = rootnp; 332 do { 333 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER"); 334 if (!np) { 335 np = of_find_node_by_name(nnp, "01_011"); 336 if (!np) 337 goto bad; 338 } 339 340 ampopts = 0; 341 pp = of_find_property(np, "ampopts", &len); 342 if (pp) { 343 ampopts = *(int *)pp->value; 344 if (ampopts == 0) { 345 /* Skip this instance, resource already 346 * allocated by other OS */ 347 nnp = np; 348 continue; 349 } 350 } 351 352 /* Select Timer-Instance on Timer Core. Default is zero */ 353 leon3_gptimer_idx = ampopts & 0x7; 354 355 pp = of_find_property(np, "reg", &len); 356 if (pp) 357 leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **) 358 pp->value; 359 pp = of_find_property(np, "interrupts", &len); 360 if (pp) 361 leon3_gptimer_irq = *(unsigned int *)pp->value; 362 } while (0); 363 364 if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq)) 365 goto bad; 366 367 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0); 368 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld, 369 (((1000000 / HZ) - 1))); 370 LEON3_BYPASS_STORE_PA( 371 &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0); 372 373 #ifdef CONFIG_SMP 374 leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx; 375 376 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) & 377 (1<<LEON3_GPTIMER_SEPIRQ))) { 378 printk(KERN_ERR "timer not configured with separate irqs\n"); 379 BUG(); 380 } 381 382 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val, 383 0); 384 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld, 385 (((1000000/HZ) - 1))); 386 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 387 0); 388 #endif 389 390 /* 391 * The IRQ controller may (if implemented) consist of multiple 392 * IRQ controllers, each mapped on a 4Kb boundary. 393 * Each CPU may be routed to different IRQCTRLs, however 394 * we assume that all CPUs (in SMP system) is routed to the 395 * same IRQ Controller, and for non-SMP only one IRQCTRL is 396 * accessed anyway. 397 * In AMP systems, Linux must run on CPU0 for the time being. 398 */ 399 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]); 400 icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf; 401 leon3_irqctrl_regs += icsel; 402 403 /* Mask all IRQs on boot-cpu IRQ controller */ 404 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0); 405 406 /* Probe extended IRQ controller */ 407 eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus) 408 >> 16) & 0xf; 409 if (eirq != 0) 410 leon_eirq_setup(eirq); 411 412 irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx); 413 err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL); 414 if (err) { 415 printk(KERN_ERR "unable to attach timer IRQ%d\n", irq); 416 prom_halt(); 417 } 418 419 #ifdef CONFIG_SMP 420 { 421 unsigned long flags; 422 423 /* 424 * In SMP, sun4m adds a IPI handler to IRQ trap handler that 425 * LEON never must take, sun4d and LEON overwrites the branch 426 * with a NOP. 427 */ 428 local_irq_save(flags); 429 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */ 430 local_ops->cache_all(); 431 local_irq_restore(flags); 432 } 433 #endif 434 435 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 436 LEON3_GPTIMER_EN | 437 LEON3_GPTIMER_RL | 438 LEON3_GPTIMER_LD | 439 LEON3_GPTIMER_IRQEN); 440 441 #ifdef CONFIG_SMP 442 /* Install per-cpu IRQ handler for broadcasted ticker */ 443 irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq, 444 "per-cpu", 0); 445 err = request_irq(irq, leon_percpu_timer_ce_interrupt, 446 IRQF_PERCPU | IRQF_TIMER, "ticker", 447 NULL); 448 if (err) { 449 printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq); 450 prom_halt(); 451 } 452 453 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 454 LEON3_GPTIMER_EN | 455 LEON3_GPTIMER_RL | 456 LEON3_GPTIMER_LD | 457 LEON3_GPTIMER_IRQEN); 458 #endif 459 return; 460 bad: 461 printk(KERN_ERR "No Timer/irqctrl found\n"); 462 BUG(); 463 return; 464 } 465 466 static void leon_clear_clock_irq(void) 467 { 468 } 469 470 static void leon_load_profile_irq(int cpu, unsigned int limit) 471 { 472 } 473 474 void __init leon_trans_init(struct device_node *dp) 475 { 476 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) { 477 struct property *p; 478 p = of_find_property(dp, "mid", (void *)0); 479 if (p) { 480 int mid; 481 dp->name = prom_early_alloc(5 + 1); 482 memcpy(&mid, p->value, p->length); 483 sprintf((char *)dp->name, "cpu%.2d", mid); 484 } 485 } 486 } 487 488 void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0; 489 490 void __init leon_node_init(struct device_node *dp, struct device_node ***nextp) 491 { 492 if (prom_amba_init && 493 strcmp(dp->type, "ambapp") == 0 && 494 strcmp(dp->name, "ambapp0") == 0) { 495 prom_amba_init(dp, nextp); 496 } 497 } 498 499 #ifdef CONFIG_SMP 500 void leon_clear_profile_irq(int cpu) 501 { 502 } 503 504 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu) 505 { 506 unsigned long mask, flags, *addr; 507 mask = leon_get_irqmask(irq_nr); 508 spin_lock_irqsave(&leon_irq_lock, flags); 509 addr = (unsigned long *)LEON_IMASK(cpu); 510 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask)); 511 spin_unlock_irqrestore(&leon_irq_lock, flags); 512 } 513 514 #endif 515 516 void __init leon_init_IRQ(void) 517 { 518 sparc_config.init_timers = leon_init_timers; 519 sparc_config.build_device_irq = _leon_build_device_irq; 520 sparc_config.clock_rate = 1000000; 521 sparc_config.clear_clock_irq = leon_clear_clock_irq; 522 sparc_config.load_profile_irq = leon_load_profile_irq; 523 } 524 525 void __init leon_init(void) 526 { 527 of_pdt_build_more = &leon_node_init; 528 } 529