LXR linux/arch/sparc/kernel/leon

   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
  27struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
  28struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
  29
  30int leondebug_irq_disable;
  31int leon_debug_irqout;
  32static int dummy_master_l10_counter;
  33unsigned long amba_system_id;
  34static DEFINE_SPINLOCK(leon_irq_lock);
  35
  36unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
  37unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
  38int leon3_ticker_irq; /* Timer ticker IRQ */
  39unsigned 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 */
  47static 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 */
  53static 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 */
  64void 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
  87static 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
 103static 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
 117static 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);
 137out:
 138        return IRQ_SET_MASK_OK;
 139}
 140
 141static 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
 154static 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
 167static 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
 174static 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 */
 181static 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
 189static 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 */
 205unsigned 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
 228out:
 229        return irq;
 230}
 231
 232static 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
 238void 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
 253void __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;
 419bad:
 420        printk(KERN_ERR "No Timer/irqctrl found\n");
 421        BUG();
 422        return;
 423}
 424
 425void leon_clear_clock_irq(void)
 426{
 427}
 428
 429void leon_load_profile_irq(int cpu, unsigned int limit)
 430{
 431        BUG();
 432}
 433
 434void __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
 448void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;
 449
 450void __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
 461void 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
 468static 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
 475static void leon_set_udt(int cpu)
 476{
 477}
 478
 479void leon_clear_profile_irq(int cpu)
 480{
 481}
 482
 483void 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
 495void __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
 513void __init leon_init(void)
 514{
 515        of_pdt_build_more = &leon_node_init;
 516}
 517