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