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
  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 = hard_smp_processor_id();
  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(0));
  83         LEON3_BYPASS_STORE_PA(LEON_IMASK(0), (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 static void leon_unmask_irq(struct irq_data *data)
 103 {
 104         unsigned long mask, oldmask, flags;
 105
 106         mask = (unsigned long)data->chip_data;
 107         spin_lock_irqsave(&leon_irq_lock, flags);
 108         oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(0));
 109         LEON3_BYPASS_STORE_PA(LEON_IMASK(0), (oldmask | mask));
 110         spin_unlock_irqrestore(&leon_irq_lock, flags);
 111 }
 112
 113 static void leon_mask_irq(struct irq_data *data)
 114 {
 115         unsigned long mask, oldmask, flags;
 116
 117         mask = (unsigned long)data->chip_data;
 118         spin_lock_irqsave(&leon_irq_lock, flags);
 119         oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(0));
 120         LEON3_BYPASS_STORE_PA(LEON_IMASK(0), (oldmask & ~mask));
 121         spin_unlock_irqrestore(&leon_irq_lock, flags);
 122 }
 123
 124 static unsigned int leon_startup_irq(struct irq_data *data)
 125 {
 126         irq_link(data->irq);
 127         leon_unmask_irq(data);
 128         return 0;
 129 }
 130
 131 static void leon_shutdown_irq(struct irq_data *data)
 132 {
 133         leon_mask_irq(data);
 134         irq_unlink(data->irq);
 135 }
 136
 137 /* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */
 138 static void leon_eoi_irq(struct irq_data *data)
 139 {
 140         unsigned long mask = (unsigned long)data->chip_data;
 141
 142         if (mask & LEON_DO_ACK_HW)
 143                 LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);
 144 }
 145
 146 static struct irq_chip leon_irq = {
 147         .name           = "leon",
 148         .irq_startup    = leon_startup_irq,
 149         .irq_shutdown   = leon_shutdown_irq,
 150         .irq_mask       = leon_mask_irq,
 151         .irq_unmask     = leon_unmask_irq,
 152         .irq_eoi        = leon_eoi_irq,
 153 };
 154
 155 /*
 156  * Build a LEON IRQ for the edge triggered LEON IRQ controller:
 157  *  Edge (normal) IRQ           - handle_simple_irq, ack=DONT-CARE, never ack
 158  *  Level IRQ (PCI|Level-GPIO)  - handle_fasteoi_irq, ack=1, ack after ISR
 159  *  Per-CPU Edge                - handle_percpu_irq, ack=0
 160  */
 161 unsigned int leon_build_device_irq(unsigned int real_irq,
 162                                     irq_flow_handler_t flow_handler,
 163                                     const char *name, int do_ack)
 164 {
 165         unsigned int irq;
 166         unsigned long mask;
 167
 168         irq = 0;
 169         mask = get_irqmask(real_irq);
 170         if (mask == 0)
 171                 goto out;
 172
 173         irq = irq_alloc(real_irq, real_irq);
 174         if (irq == 0)
 175                 goto out;
 176
 177         if (do_ack)
 178                 mask |= LEON_DO_ACK_HW;
 179
 180         irq_set_chip_and_handler_name(irq, &leon_irq,
 181                                       flow_handler, name);
 182         irq_set_chip_data(irq, (void *)mask);
 183
 184 out:
 185         return irq;
 186 }
 187
 188 static unsigned int _leon_build_device_irq(struct platform_device *op,
 189                                            unsigned int real_irq)
 190 {
 191         return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);
 192 }
 193
 194 void __init leon_init_timers(irq_handler_t counter_fn)
 195 {
 196         int irq, eirq;
 197         struct device_node *rootnp, *np, *nnp;
 198         struct property *pp;
 199         int len;
 200         int cpu, icsel;
 201         int ampopts;
 202         int err;
 203
 204         leondebug_irq_disable = 0;
 205         leon_debug_irqout = 0;
 206         master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
 207         dummy_master_l10_counter = 0;
 208
 209         rootnp = of_find_node_by_path("/ambapp0");
 210         if (!rootnp)
 211                 goto bad;
 212
 213         /* Find System ID: GRLIB build ID and optional CHIP ID */
 214         pp = of_find_property(rootnp, "systemid", &len);
 215         if (pp)
 216                 amba_system_id = *(unsigned long *)pp->value;
 217
 218         /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
 219         np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
 220         if (!np) {
 221                 np = of_find_node_by_name(rootnp, "01_00d");
 222                 if (!np)
 223                         goto bad;
 224         }
 225         pp = of_find_property(np, "reg", &len);
 226         if (!pp)
 227                 goto bad;
 228         leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
 229
 230         /* Find GPTIMER Timer Registers base address otherwise bail out. */
 231         nnp = rootnp;
 232         do {
 233                 np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
 234                 if (!np) {
 235                         np = of_find_node_by_name(nnp, "01_011");
 236                         if (!np)
 237                                 goto bad;
 238                 }
 239
 240                 ampopts = 0;
 241                 pp = of_find_property(np, "ampopts", &len);
 242                 if (pp) {
 243                         ampopts = *(int *)pp->value;
 244                         if (ampopts == 0) {
 245                                 /* Skip this instance, resource already
 246                                  * allocated by other OS */
 247                                 nnp = np;
 248                                 continue;
 249                         }
 250                 }
 251
 252                 /* Select Timer-Instance on Timer Core. Default is zero */
 253                 leon3_gptimer_idx = ampopts & 0x7;
 254
 255                 pp = of_find_property(np, "reg", &len);
 256                 if (pp)
 257                         leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
 258                                                 pp->value;
 259                 pp = of_find_property(np, "interrupts", &len);
 260                 if (pp)
 261                         leon3_gptimer_irq = *(unsigned int *)pp->value;
 262         } while (0);
 263
 264         if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
 265                 goto bad;
 266
 267         LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
 268         LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
 269                                 (((1000000 / HZ) - 1)));
 270         LEON3_BYPASS_STORE_PA(
 271                         &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
 272
 273 #ifdef CONFIG_SMP
 274         leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
 275
 276         if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
 277               (1<<LEON3_GPTIMER_SEPIRQ))) {
 278                 printk(KERN_ERR "timer not configured with separate irqs\n");
 279                 BUG();
 280         }
 281
 282         LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val,
 283                                 0);
 284         LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
 285                                 (((1000000/HZ) - 1)));
 286         LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
 287                                 0);
 288 #endif
 289
 290         /*
 291          * The IRQ controller may (if implemented) consist of multiple
 292          * IRQ controllers, each mapped on a 4Kb boundary.
 293          * Each CPU may be routed to different IRQCTRLs, however
 294          * we assume that all CPUs (in SMP system) is routed to the
 295          * same IRQ Controller, and for non-SMP only one IRQCTRL is
 296          * accessed anyway.
 297          * In AMP systems, Linux must run on CPU0 for the time being.
 298          */
 299         cpu = sparc_leon3_cpuid();
 300         icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[cpu/8]);
 301         icsel = (icsel >> ((7 - (cpu&0x7)) * 4)) & 0xf;
 302         leon3_irqctrl_regs += icsel;
 303
 304         /* Probe extended IRQ controller */
 305         eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
 306                 >> 16) & 0xf;
 307         if (eirq != 0)
 308                 leon_eirq_setup(eirq);
 309
 310         irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx);
 311         err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL);
 312         if (err) {
 313                 printk(KERN_ERR "unable to attach timer IRQ%d\n", irq);
 314                 prom_halt();
 315         }
 316
 317         LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
 318                               LEON3_GPTIMER_EN |
 319                               LEON3_GPTIMER_RL |
 320                               LEON3_GPTIMER_LD |
 321                               LEON3_GPTIMER_IRQEN);
 322
 323 #ifdef CONFIG_SMP
 324         /* Install per-cpu IRQ handler for broadcasted ticker */
 325         irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq,
 326                                     "per-cpu", 0);
 327         err = request_irq(irq, leon_percpu_timer_interrupt,
 328                           IRQF_PERCPU | IRQF_TIMER, "ticker",
 329                           NULL);
 330         if (err) {
 331                 printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
 332                 prom_halt();
 333         }
 334
 335         LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
 336                               LEON3_GPTIMER_EN |
 337                               LEON3_GPTIMER_RL |
 338                               LEON3_GPTIMER_LD |
 339                               LEON3_GPTIMER_IRQEN);
 340 #endif
 341         return;
 342 bad:
 343         printk(KERN_ERR "No Timer/irqctrl found\n");
 344         BUG();
 345         return;
 346 }
 347
 348 void leon_clear_clock_irq(void)
 349 {
 350 }
 351
 352 void leon_load_profile_irq(int cpu, unsigned int limit)
 353 {
 354         BUG();
 355 }
 356
 357 void __init leon_trans_init(struct device_node *dp)
 358 {
 359         if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
 360                 struct property *p;
 361                 p = of_find_property(dp, "mid", (void *)0);
 362                 if (p) {
 363                         int mid;
 364                         dp->name = prom_early_alloc(5 + 1);
 365                         memcpy(&mid, p->value, p->length);
 366                         sprintf((char *)dp->name, "cpu%.2d", mid);
 367                 }
 368         }
 369 }
 370
 371 void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;
 372
 373 void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
 374 {
 375         if (prom_amba_init &&
 376             strcmp(dp->type, "ambapp") == 0 &&
 377             strcmp(dp->name, "ambapp0") == 0) {
 378                 prom_amba_init(dp, nextp);
 379         }
 380 }
 381
 382 #ifdef CONFIG_SMP
 383
 384 void leon_set_cpu_int(int cpu, int level)
 385 {
 386         unsigned long mask;
 387         mask = get_irqmask(level);
 388         LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
 389 }
 390
 391 static void leon_clear_ipi(int cpu, int level)
 392 {
 393         unsigned long mask;
 394         mask = get_irqmask(level);
 395         LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
 396 }
 397
 398 static void leon_set_udt(int cpu)
 399 {
 400 }
 401
 402 void leon_clear_profile_irq(int cpu)
 403 {
 404 }
 405
 406 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
 407 {
 408         unsigned long mask, flags, *addr;
 409         mask = get_irqmask(irq_nr);
 410         spin_lock_irqsave(&leon_irq_lock, flags);
 411         addr = (unsigned long *)LEON_IMASK(cpu);
 412         LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));
 413         spin_unlock_irqrestore(&leon_irq_lock, flags);
 414 }
 415
 416 #endif
 417
 418 void __init leon_init_IRQ(void)
 419 {
 420         sparc_irq_config.init_timers      = leon_init_timers;
 421         sparc_irq_config.build_device_irq = _leon_build_device_irq;
 422
 423         BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq,
 424                         BTFIXUPCALL_NORM);
 425         BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq,
 426                         BTFIXUPCALL_NOP);
 427
 428 #ifdef CONFIG_SMP
 429         BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM);
 430         BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM);
 431         BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM);
 432 #endif
 433
 434 }
 435
 436 void __init leon_init(void)
 437 {
 438         of_pdt_build_more = &leon_node_init;
 439 }