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; 216 217 irq = 0; 218 mask = leon_get_irqmask(real_irq); 219 if (mask == 0) 220 goto out; 221 222 irq = irq_alloc(real_irq, real_irq); 223 if (irq == 0) 224 goto out; 225 226 if (do_ack) 227 mask |= LEON_DO_ACK_HW; 228 229 irq_set_chip_and_handler_name(irq, &leon_irq, 230 flow_handler, name); 231 irq_set_chip_data(irq, (void *)mask); 232 233 out: 234 return irq; 235 } 236 237 static unsigned int _leon_build_device_irq(struct platform_device *op, 238 unsigned int real_irq) 239 { 240 return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0); 241 } 242 243 void leon_update_virq_handling(unsigned int virq, 244 irq_flow_handler_t flow_handler, 245 const char *name, int do_ack) 246 { 247 unsigned long mask = (unsigned long)irq_get_chip_data(virq); 248 249 mask &= ~LEON_DO_ACK_HW; 250 if (do_ack) 251 mask |= LEON_DO_ACK_HW; 252 253 irq_set_chip_and_handler_name(virq, &leon_irq, 254 flow_handler, name); 255 irq_set_chip_data(virq, (void *)mask); 256 } 257 258 static u32 leon_cycles_offset(void) 259 { 260 u32 rld, val, off; 261 rld = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld); 262 val = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val); 263 off = rld - val; 264 return rld - val; 265 } 266 267 #ifdef CONFIG_SMP 268 269 /* smp clockevent irq */ 270 irqreturn_t leon_percpu_timer_ce_interrupt(int irq, void *unused) 271 { 272 struct clock_event_device *ce; 273 int cpu = smp_processor_id(); 274 275 leon_clear_profile_irq(cpu); 276 277 ce = &per_cpu(sparc32_clockevent, cpu); 278 279 irq_enter(); 280 if (ce->event_handler) 281 ce->event_handler(ce); 282 irq_exit(); 283 284 return IRQ_HANDLED; 285 } 286 287 #endif /* CONFIG_SMP */ 288 289 void __init leon_init_timers(void) 290 { 291 int irq, eirq; 292 struct device_node *rootnp, *np, *nnp; 293 struct property *pp; 294 int len; 295 int icsel; 296 int ampopts; 297 int err; 298 299 sparc_config.get_cycles_offset = leon_cycles_offset; 300 sparc_config.cs_period = 1000000 / HZ; 301 sparc_config.features |= FEAT_L10_CLOCKSOURCE; 302 303 #ifndef CONFIG_SMP 304 sparc_config.features |= FEAT_L10_CLOCKEVENT; 305 #endif 306 307 leondebug_irq_disable = 0; 308 leon_debug_irqout = 0; 309 master_l10_counter = (unsigned int *)&dummy_master_l10_counter; 310 dummy_master_l10_counter = 0; 311 312 rootnp = of_find_node_by_path("/ambapp0"); 313 if (!rootnp) 314 goto bad; 315 316 /* Find System ID: GRLIB build ID and optional CHIP ID */ 317 pp = of_find_property(rootnp, "systemid", &len); 318 if (pp) 319 amba_system_id = *(unsigned long *)pp->value; 320 321 /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */ 322 np = of_find_node_by_name(rootnp, "GAISLER_IRQMP"); 323 if (!np) { 324 np = of_find_node_by_name(rootnp, "01_00d"); 325 if (!np) 326 goto bad; 327 } 328 pp = of_find_property(np, "reg", &len); 329 if (!pp) 330 goto bad; 331 leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value; 332 333 /* Find GPTIMER Timer Registers base address otherwise bail out. */ 334 nnp = rootnp; 335 do { 336 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER"); 337 if (!np) { 338 np = of_find_node_by_name(nnp, "01_011"); 339 if (!np) 340 goto bad; 341 } 342 343 ampopts = 0; 344 pp = of_find_property(np, "ampopts", &len); 345 if (pp) { 346 ampopts = *(int *)pp->value; 347 if (ampopts == 0) { 348 /* Skip this instance, resource already 349 * allocated by other OS */ 350 nnp = np; 351 continue; 352 } 353 } 354 355 /* Select Timer-Instance on Timer Core. Default is zero */ 356 leon3_gptimer_idx = ampopts & 0x7; 357 358 pp = of_find_property(np, "reg", &len); 359 if (pp) 360 leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **) 361 pp->value; 362 pp = of_find_property(np, "interrupts", &len); 363 if (pp) 364 leon3_gptimer_irq = *(unsigned int *)pp->value; 365 } while (0); 366 367 if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq)) 368 goto bad; 369 370 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0); 371 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld, 372 (((1000000 / HZ) - 1))); 373 LEON3_BYPASS_STORE_PA( 374 &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0); 375 376 #ifdef CONFIG_SMP 377 leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx; 378 379 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) & 380 (1<<LEON3_GPTIMER_SEPIRQ))) { 381 printk(KERN_ERR "timer not configured with separate irqs\n"); 382 BUG(); 383 } 384 385 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val, 386 0); 387 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld, 388 (((1000000/HZ) - 1))); 389 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 390 0); 391 #endif 392 393 /* 394 * The IRQ controller may (if implemented) consist of multiple 395 * IRQ controllers, each mapped on a 4Kb boundary. 396 * Each CPU may be routed to different IRQCTRLs, however 397 * we assume that all CPUs (in SMP system) is routed to the 398 * same IRQ Controller, and for non-SMP only one IRQCTRL is 399 * accessed anyway. 400 * In AMP systems, Linux must run on CPU0 for the time being. 401 */ 402 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]); 403 icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf; 404 leon3_irqctrl_regs += icsel; 405 406 /* Mask all IRQs on boot-cpu IRQ controller */ 407 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0); 408 409 /* Probe extended IRQ controller */ 410 eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus) 411 >> 16) & 0xf; 412 if (eirq != 0) 413 leon_eirq_setup(eirq); 414 415 irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx); 416 err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL); 417 if (err) { 418 printk(KERN_ERR "unable to attach timer IRQ%d\n", irq); 419 prom_halt(); 420 } 421 422 #ifdef CONFIG_SMP 423 { 424 unsigned long flags; 425 426 /* 427 * In SMP, sun4m adds a IPI handler to IRQ trap handler that 428 * LEON never must take, sun4d and LEON overwrites the branch 429 * with a NOP. 430 */ 431 local_irq_save(flags); 432 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */ 433 local_ops->cache_all(); 434 local_irq_restore(flags); 435 } 436 #endif 437 438 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 439 LEON3_GPTIMER_EN | 440 LEON3_GPTIMER_RL | 441 LEON3_GPTIMER_LD | 442 LEON3_GPTIMER_IRQEN); 443 444 #ifdef CONFIG_SMP 445 /* Install per-cpu IRQ handler for broadcasted ticker */ 446 irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq, 447 "per-cpu", 0); 448 err = request_irq(irq, leon_percpu_timer_ce_interrupt, 449 IRQF_PERCPU | IRQF_TIMER, "ticker", 450 NULL); 451 if (err) { 452 printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq); 453 prom_halt(); 454 } 455 456 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 457 LEON3_GPTIMER_EN | 458 LEON3_GPTIMER_RL | 459 LEON3_GPTIMER_LD | 460 LEON3_GPTIMER_IRQEN); 461 #endif 462 return; 463 bad: 464 printk(KERN_ERR "No Timer/irqctrl found\n"); 465 BUG(); 466 return; 467 } 468 469 static void leon_clear_clock_irq(void) 470 { 471 } 472 473 static void leon_load_profile_irq(int cpu, unsigned int limit) 474 { 475 } 476 477 void __init leon_trans_init(struct device_node *dp) 478 { 479 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) { 480 struct property *p; 481 p = of_find_property(dp, "mid", (void *)0); 482 if (p) { 483 int mid; 484 dp->name = prom_early_alloc(5 + 1); 485 memcpy(&mid, p->value, p->length); 486 sprintf((char *)dp->name, "cpu%.2d", mid); 487 } 488 } 489 } 490 491 #ifdef CONFIG_SMP 492 void leon_clear_profile_irq(int cpu) 493 { 494 } 495 496 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu) 497 { 498 unsigned long mask, flags, *addr; 499 mask = leon_get_irqmask(irq_nr); 500 spin_lock_irqsave(&leon_irq_lock, flags); 501 addr = (unsigned long *)LEON_IMASK(cpu); 502 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask)); 503 spin_unlock_irqrestore(&leon_irq_lock, flags); 504 } 505 506 #endif 507 508 void __init leon_init_IRQ(void) 509 { 510 sparc_config.init_timers = leon_init_timers; 511 sparc_config.build_device_irq = _leon_build_device_irq; 512 sparc_config.clock_rate = 1000000; 513 sparc_config.clear_clock_irq = leon_clear_clock_irq; 514 sparc_config.load_profile_irq = leon_load_profile_irq; 515 } 516