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 14 #include <asm/oplib.h> 15 #include <asm/timer.h> 16 #include <asm/prom.h> 17 #include <asm/leon.h> 18 #include <asm/leon_amba.h> 19 #include <asm/traps.h> 20 #include <asm/cacheflush.h> 21 #include <asm/smp.h> 22 #include <asm/setup.h> 23 24 #include "prom.h" 25 #include "irq.h" 26 27 struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */ 28 struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */ 29 30 int leondebug_irq_disable; 31 int leon_debug_irqout; 32 static int dummy_master_l10_counter; 33 unsigned long amba_system_id; 34 static DEFINE_SPINLOCK(leon_irq_lock); 35 36 unsigned long leon3_gptimer_irq; /* interrupt controller irq number */ 37 unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */ 38 int leon3_ticker_irq; /* Timer ticker IRQ */ 39 unsigned int sparc_leon_eirq; 40 #define LEON_IMASK(cpu) (&leon3_irqctrl_regs->mask[cpu]) 41 #define LEON_IACK (&leon3_irqctrl_regs->iclear) 42 #define LEON_DO_ACK_HW 1 43 44 /* Return the last ACKed IRQ by the Extended IRQ controller. It has already 45 * been (automatically) ACKed when the CPU takes the trap. 46 */ 47 static inline unsigned int leon_eirq_get(int cpu) 48 { 49 return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f; 50 } 51 52 /* Handle one or multiple IRQs from the extended interrupt controller */ 53 static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc) 54 { 55 unsigned int eirq; 56 int cpu = sparc_leon3_cpuid(); 57 58 eirq = leon_eirq_get(cpu); 59 if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */ 60 generic_handle_irq(irq_map[eirq]->irq); 61 } 62 63 /* The extended IRQ controller has been found, this function registers it */ 64 void leon_eirq_setup(unsigned int eirq) 65 { 66 unsigned long mask, oldmask; 67 unsigned int veirq; 68 69 if (eirq < 1 || eirq > 0xf) { 70 printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq); 71 return; 72 } 73 74 veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0); 75 76 /* 77 * Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ 78 * controller have a mask-bit of their own, so this is safe. 79 */ 80 irq_link(veirq); 81 mask = 1 << eirq; 82 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id)); 83 LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask | mask)); 84 sparc_leon_eirq = eirq; 85 } 86 87 static inline unsigned long get_irqmask(unsigned int irq) 88 { 89 unsigned long mask; 90 91 if (!irq || ((irq > 0xf) && !sparc_leon_eirq) 92 || ((irq > 0x1f) && sparc_leon_eirq)) { 93 printk(KERN_ERR 94 "leon_get_irqmask: false irq number: %d\n", irq); 95 mask = 0; 96 } else { 97 mask = LEON_HARD_INT(irq); 98 } 99 return mask; 100 } 101 102 #ifdef CONFIG_SMP 103 static int irq_choose_cpu(const struct cpumask *affinity) 104 { 105 cpumask_t mask; 106 107 cpumask_and(&mask, cpu_online_mask, affinity); 108 if (cpumask_equal(&mask, cpu_online_mask) || cpumask_empty(&mask)) 109 return boot_cpu_id; 110 else 111 return cpumask_first(&mask); 112 } 113 #else 114 #define irq_choose_cpu(affinity) boot_cpu_id 115 #endif 116 117 static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest, 118 bool force) 119 { 120 unsigned long mask, oldmask, flags; 121 int oldcpu, newcpu; 122 123 mask = (unsigned long)data->chip_data; 124 oldcpu = irq_choose_cpu(data->affinity); 125 newcpu = irq_choose_cpu(dest); 126 127 if (oldcpu == newcpu) 128 goto out; 129 130 /* unmask on old CPU first before enabling on the selected CPU */ 131 spin_lock_irqsave(&leon_irq_lock, flags); 132 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(oldcpu)); 133 LEON3_BYPASS_STORE_PA(LEON_IMASK(oldcpu), (oldmask & ~mask)); 134 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(newcpu)); 135 LEON3_BYPASS_STORE_PA(LEON_IMASK(newcpu), (oldmask | mask)); 136 spin_unlock_irqrestore(&leon_irq_lock, flags); 137 out: 138 return IRQ_SET_MASK_OK; 139 } 140 141 static void leon_unmask_irq(struct irq_data *data) 142 { 143 unsigned long mask, oldmask, flags; 144 int cpu; 145 146 mask = (unsigned long)data->chip_data; 147 cpu = irq_choose_cpu(data->affinity); 148 spin_lock_irqsave(&leon_irq_lock, flags); 149 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu)); 150 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask | mask)); 151 spin_unlock_irqrestore(&leon_irq_lock, flags); 152 } 153 154 static void leon_mask_irq(struct irq_data *data) 155 { 156 unsigned long mask, oldmask, flags; 157 int cpu; 158 159 mask = (unsigned long)data->chip_data; 160 cpu = irq_choose_cpu(data->affinity); 161 spin_lock_irqsave(&leon_irq_lock, flags); 162 oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu)); 163 LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask & ~mask)); 164 spin_unlock_irqrestore(&leon_irq_lock, flags); 165 } 166 167 static unsigned int leon_startup_irq(struct irq_data *data) 168 { 169 irq_link(data->irq); 170 leon_unmask_irq(data); 171 return 0; 172 } 173 174 static void leon_shutdown_irq(struct irq_data *data) 175 { 176 leon_mask_irq(data); 177 irq_unlink(data->irq); 178 } 179 180 /* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */ 181 static void leon_eoi_irq(struct irq_data *data) 182 { 183 unsigned long mask = (unsigned long)data->chip_data; 184 185 if (mask & LEON_DO_ACK_HW) 186 LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW); 187 } 188 189 static struct irq_chip leon_irq = { 190 .name = "leon", 191 .irq_startup = leon_startup_irq, 192 .irq_shutdown = leon_shutdown_irq, 193 .irq_mask = leon_mask_irq, 194 .irq_unmask = leon_unmask_irq, 195 .irq_eoi = leon_eoi_irq, 196 .irq_set_affinity = leon_set_affinity, 197 }; 198 199 /* 200 * Build a LEON IRQ for the edge triggered LEON IRQ controller: 201 * Edge (normal) IRQ - handle_simple_irq, ack=DONT-CARE, never ack 202 * Level IRQ (PCI|Level-GPIO) - handle_fasteoi_irq, ack=1, ack after ISR 203 * Per-CPU Edge - handle_percpu_irq, ack=0 204 */ 205 unsigned int leon_build_device_irq(unsigned int real_irq, 206 irq_flow_handler_t flow_handler, 207 const char *name, int do_ack) 208 { 209 unsigned int irq; 210 unsigned long mask; 211 212 irq = 0; 213 mask = get_irqmask(real_irq); 214 if (mask == 0) 215 goto out; 216 217 irq = irq_alloc(real_irq, real_irq); 218 if (irq == 0) 219 goto out; 220 221 if (do_ack) 222 mask |= LEON_DO_ACK_HW; 223 224 irq_set_chip_and_handler_name(irq, &leon_irq, 225 flow_handler, name); 226 irq_set_chip_data(irq, (void *)mask); 227 228 out: 229 return irq; 230 } 231 232 static unsigned int _leon_build_device_irq(struct platform_device *op, 233 unsigned int real_irq) 234 { 235 return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0); 236 } 237 238 void leon_update_virq_handling(unsigned int virq, 239 irq_flow_handler_t flow_handler, 240 const char *name, int do_ack) 241 { 242 unsigned long mask = (unsigned long)irq_get_chip_data(virq); 243 244 mask &= ~LEON_DO_ACK_HW; 245 if (do_ack) 246 mask |= LEON_DO_ACK_HW; 247 248 irq_set_chip_and_handler_name(virq, &leon_irq, 249 flow_handler, name); 250 irq_set_chip_data(virq, (void *)mask); 251 } 252 253 void __init leon_init_timers(irq_handler_t counter_fn) 254 { 255 int irq, eirq; 256 struct device_node *rootnp, *np, *nnp; 257 struct property *pp; 258 int len; 259 int icsel; 260 int ampopts; 261 int err; 262 263 leondebug_irq_disable = 0; 264 leon_debug_irqout = 0; 265 master_l10_counter = (unsigned int *)&dummy_master_l10_counter; 266 dummy_master_l10_counter = 0; 267 268 rootnp = of_find_node_by_path("/ambapp0"); 269 if (!rootnp) 270 goto bad; 271 272 /* Find System ID: GRLIB build ID and optional CHIP ID */ 273 pp = of_find_property(rootnp, "systemid", &len); 274 if (pp) 275 amba_system_id = *(unsigned long *)pp->value; 276 277 /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */ 278 np = of_find_node_by_name(rootnp, "GAISLER_IRQMP"); 279 if (!np) { 280 np = of_find_node_by_name(rootnp, "01_00d"); 281 if (!np) 282 goto bad; 283 } 284 pp = of_find_property(np, "reg", &len); 285 if (!pp) 286 goto bad; 287 leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value; 288 289 /* Find GPTIMER Timer Registers base address otherwise bail out. */ 290 nnp = rootnp; 291 do { 292 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER"); 293 if (!np) { 294 np = of_find_node_by_name(nnp, "01_011"); 295 if (!np) 296 goto bad; 297 } 298 299 ampopts = 0; 300 pp = of_find_property(np, "ampopts", &len); 301 if (pp) { 302 ampopts = *(int *)pp->value; 303 if (ampopts == 0) { 304 /* Skip this instance, resource already 305 * allocated by other OS */ 306 nnp = np; 307 continue; 308 } 309 } 310 311 /* Select Timer-Instance on Timer Core. Default is zero */ 312 leon3_gptimer_idx = ampopts & 0x7; 313 314 pp = of_find_property(np, "reg", &len); 315 if (pp) 316 leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **) 317 pp->value; 318 pp = of_find_property(np, "interrupts", &len); 319 if (pp) 320 leon3_gptimer_irq = *(unsigned int *)pp->value; 321 } while (0); 322 323 if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq)) 324 goto bad; 325 326 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0); 327 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld, 328 (((1000000 / HZ) - 1))); 329 LEON3_BYPASS_STORE_PA( 330 &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0); 331 332 #ifdef CONFIG_SMP 333 leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx; 334 335 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) & 336 (1<<LEON3_GPTIMER_SEPIRQ))) { 337 printk(KERN_ERR "timer not configured with separate irqs\n"); 338 BUG(); 339 } 340 341 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val, 342 0); 343 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld, 344 (((1000000/HZ) - 1))); 345 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 346 0); 347 #endif 348 349 /* 350 * The IRQ controller may (if implemented) consist of multiple 351 * IRQ controllers, each mapped on a 4Kb boundary. 352 * Each CPU may be routed to different IRQCTRLs, however 353 * we assume that all CPUs (in SMP system) is routed to the 354 * same IRQ Controller, and for non-SMP only one IRQCTRL is 355 * accessed anyway. 356 * In AMP systems, Linux must run on CPU0 for the time being. 357 */ 358 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]); 359 icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf; 360 leon3_irqctrl_regs += icsel; 361 362 /* Mask all IRQs on boot-cpu IRQ controller */ 363 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0); 364 365 /* Probe extended IRQ controller */ 366 eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus) 367 >> 16) & 0xf; 368 if (eirq != 0) 369 leon_eirq_setup(eirq); 370 371 irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx); 372 err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL); 373 if (err) { 374 printk(KERN_ERR "unable to attach timer IRQ%d\n", irq); 375 prom_halt(); 376 } 377 378 #ifdef CONFIG_SMP 379 { 380 unsigned long flags; 381 382 /* 383 * In SMP, sun4m adds a IPI handler to IRQ trap handler that 384 * LEON never must take, sun4d and LEON overwrites the branch 385 * with a NOP. 386 */ 387 local_irq_save(flags); 388 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */ 389 local_flush_cache_all(); 390 local_irq_restore(flags); 391 } 392 #endif 393 394 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 395 LEON3_GPTIMER_EN | 396 LEON3_GPTIMER_RL | 397 LEON3_GPTIMER_LD | 398 LEON3_GPTIMER_IRQEN); 399 400 #ifdef CONFIG_SMP 401 /* Install per-cpu IRQ handler for broadcasted ticker */ 402 irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq, 403 "per-cpu", 0); 404 err = request_irq(irq, leon_percpu_timer_interrupt, 405 IRQF_PERCPU | IRQF_TIMER, "ticker", 406 NULL); 407 if (err) { 408 printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq); 409 prom_halt(); 410 } 411 412 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 413 LEON3_GPTIMER_EN | 414 LEON3_GPTIMER_RL | 415 LEON3_GPTIMER_LD | 416 LEON3_GPTIMER_IRQEN); 417 #endif 418 return; 419 bad: 420 printk(KERN_ERR "No Timer/irqctrl found\n"); 421 BUG(); 422 return; 423 } 424 425 void leon_clear_clock_irq(void) 426 { 427 } 428 429 void leon_load_profile_irq(int cpu, unsigned int limit) 430 { 431 BUG(); 432 } 433 434 void __init leon_trans_init(struct device_node *dp) 435 { 436 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) { 437 struct property *p; 438 p = of_find_property(dp, "mid", (void *)0); 439 if (p) { 440 int mid; 441 dp->name = prom_early_alloc(5 + 1); 442 memcpy(&mid, p->value, p->length); 443 sprintf((char *)dp->name, "cpu%.2d", mid); 444 } 445 } 446 } 447 448 void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0; 449 450 void __init leon_node_init(struct device_node *dp, struct device_node ***nextp) 451 { 452 if (prom_amba_init && 453 strcmp(dp->type, "ambapp") == 0 && 454 strcmp(dp->name, "ambapp0") == 0) { 455 prom_amba_init(dp, nextp); 456 } 457 } 458 459 #ifdef CONFIG_SMP 460 461 void leon_set_cpu_int(int cpu, int level) 462 { 463 unsigned long mask; 464 mask = get_irqmask(level); 465 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask); 466 } 467 468 static void leon_clear_ipi(int cpu, int level) 469 { 470 unsigned long mask; 471 mask = get_irqmask(level); 472 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16); 473 } 474 475 static void leon_set_udt(int cpu) 476 { 477 } 478 479 void leon_clear_profile_irq(int cpu) 480 { 481 } 482 483 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu) 484 { 485 unsigned long mask, flags, *addr; 486 mask = get_irqmask(irq_nr); 487 spin_lock_irqsave(&leon_irq_lock, flags); 488 addr = (unsigned long *)LEON_IMASK(cpu); 489 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask)); 490 spin_unlock_irqrestore(&leon_irq_lock, flags); 491 } 492 493 #endif 494 495 void __init leon_init_IRQ(void) 496 { 497 sparc_irq_config.init_timers = leon_init_timers; 498 sparc_irq_config.build_device_irq = _leon_build_device_irq; 499 500 BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq, 501 BTFIXUPCALL_NORM); 502 BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq, 503 BTFIXUPCALL_NOP); 504 505 #ifdef CONFIG_SMP 506 BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM); 507 BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM); 508 BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM); 509 #endif 510 511 } 512 513 void __init leon_init(void) 514 { 515 of_pdt_build_more = &leon_node_init; 516 } 517