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