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=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, 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