arch/sparc/kernel/leon_kernel.c

   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         cpus_and(mask, cpu_online_map, *affinity);
 108         if (cpus_equal(mask, cpu_online_map) || cpus_empty(mask))
 109                 return boot_cpu_id;
 110         else
 111                 return first_cpu(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 }