hw/slavio_intctl.c

   1 /*
   2  * QEMU Sparc SLAVIO interrupt controller emulation
   3  *
   4  * Copyright (c) 2003-2005 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "sun4m.h"
  26 #include "monitor.h"
  27 #include "sysbus.h"
  28
  29 //#define DEBUG_IRQ_COUNT
  30 //#define DEBUG_IRQ
  31
  32 #ifdef DEBUG_IRQ
  33 #define DPRINTF(fmt, ...)                                       \
  34     do { printf("IRQ: " fmt , ## __VA_ARGS__); } while (0)
  35 #else
  36 #define DPRINTF(fmt, ...)
  37 #endif
  38
  39 /*
  40  * Registers of interrupt controller in sun4m.
  41  *
  42  * This is the interrupt controller part of chip STP2001 (Slave I/O), also
  43  * produced as NCR89C105. See
  44  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C105.txt
  45  *
  46  * There is a system master controller and one for each cpu.
  47  *
  48  */
  49
  50 #define MAX_CPUS 16
  51 #define MAX_PILS 16
  52
  53 struct SLAVIO_INTCTLState;
  54
  55 typedef struct SLAVIO_CPUINTCTLState {
  56     uint32_t intreg_pending;
  57     struct SLAVIO_INTCTLState *master;
  58     uint32_t cpu;
  59     uint32_t irl_out;
  60 } SLAVIO_CPUINTCTLState;
  61
  62 typedef struct SLAVIO_INTCTLState {
  63     SysBusDevice busdev;
  64     uint32_t intregm_pending;
  65     uint32_t intregm_disabled;
  66     uint32_t target_cpu;
  67 #ifdef DEBUG_IRQ_COUNT
  68     uint64_t irq_count[32];
  69 #endif
  70     qemu_irq cpu_irqs[MAX_CPUS][MAX_PILS];
  71     SLAVIO_CPUINTCTLState slaves[MAX_CPUS];
  72 } SLAVIO_INTCTLState;
  73
  74 #define INTCTL_MAXADDR 0xf
  75 #define INTCTL_SIZE (INTCTL_MAXADDR + 1)
  76 #define INTCTLM_SIZE 0x14
  77 #define MASTER_IRQ_MASK ~0x0fa2007f
  78 #define MASTER_DISABLE 0x80000000
  79 #define CPU_SOFTIRQ_MASK 0xfffe0000
  80 #define CPU_IRQ_INT15_IN (1 << 15)
  81 #define CPU_IRQ_TIMER_IN (1 << 14)
  82
  83 static void slavio_check_interrupts(SLAVIO_INTCTLState *s, int set_irqs);
  84
  85 // per-cpu interrupt controller
  86 static uint32_t slavio_intctl_mem_readl(void *opaque, target_phys_addr_t addr)
  87 {
  88     SLAVIO_CPUINTCTLState *s = opaque;
  89     uint32_t saddr, ret;
  90
  91     saddr = addr >> 2;
  92     switch (saddr) {
  93     case 0:
  94         ret = s->intreg_pending;
  95         break;
  96     default:
  97         ret = 0;
  98         break;
  99     }
 100     DPRINTF("read cpu %d reg 0x" TARGET_FMT_plx " = %x\n", s->cpu, addr, ret);
 101
 102     return ret;
 103 }
 104
 105 static void slavio_intctl_mem_writel(void *opaque, target_phys_addr_t addr,
 106                                      uint32_t val)
 107 {
 108     SLAVIO_CPUINTCTLState *s = opaque;
 109     uint32_t saddr;
 110
 111     saddr = addr >> 2;
 112     DPRINTF("write cpu %d reg 0x" TARGET_FMT_plx " = %x\n", s->cpu, addr, val);
 113     switch (saddr) {
 114     case 1: // clear pending softints
 115         val &= CPU_SOFTIRQ_MASK | CPU_IRQ_INT15_IN;
 116         s->intreg_pending &= ~val;
 117         slavio_check_interrupts(s->master, 1);
 118         DPRINTF("Cleared cpu %d irq mask %x, curmask %x\n", s->cpu, val,
 119                 s->intreg_pending);
 120         break;
 121     case 2: // set softint
 122         val &= CPU_SOFTIRQ_MASK;
 123         s->intreg_pending |= val;
 124         slavio_check_interrupts(s->master, 1);
 125         DPRINTF("Set cpu %d irq mask %x, curmask %x\n", s->cpu, val,
 126                 s->intreg_pending);
 127         break;
 128     default:
 129         break;
 130     }
 131 }
 132
 133 static CPUReadMemoryFunc * const slavio_intctl_mem_read[3] = {
 134     NULL,
 135     NULL,
 136     slavio_intctl_mem_readl,
 137 };
 138
 139 static CPUWriteMemoryFunc * const slavio_intctl_mem_write[3] = {
 140     NULL,
 141     NULL,
 142     slavio_intctl_mem_writel,
 143 };
 144
 145 // master system interrupt controller
 146 static uint32_t slavio_intctlm_mem_readl(void *opaque, target_phys_addr_t addr)
 147 {
 148     SLAVIO_INTCTLState *s = opaque;
 149     uint32_t saddr, ret;
 150
 151     saddr = addr >> 2;
 152     switch (saddr) {
 153     case 0:
 154         ret = s->intregm_pending & ~MASTER_DISABLE;
 155         break;
 156     case 1:
 157         ret = s->intregm_disabled & MASTER_IRQ_MASK;
 158         break;
 159     case 4:
 160         ret = s->target_cpu;
 161         break;
 162     default:
 163         ret = 0;
 164         break;
 165     }
 166     DPRINTF("read system reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);
 167
 168     return ret;
 169 }
 170
 171 static void slavio_intctlm_mem_writel(void *opaque, target_phys_addr_t addr,
 172                                       uint32_t val)
 173 {
 174     SLAVIO_INTCTLState *s = opaque;
 175     uint32_t saddr;
 176
 177     saddr = addr >> 2;
 178     DPRINTF("write system reg 0x" TARGET_FMT_plx " = %x\n", addr, val);
 179     switch (saddr) {
 180     case 2: // clear (enable)
 181         // Force clear unused bits
 182         val &= MASTER_IRQ_MASK;
 183         s->intregm_disabled &= ~val;
 184         DPRINTF("Enabled master irq mask %x, curmask %x\n", val,
 185                 s->intregm_disabled);
 186         slavio_check_interrupts(s, 1);
 187         break;
 188     case 3: // set (disable, clear pending)
 189         // Force clear unused bits
 190         val &= MASTER_IRQ_MASK;
 191         s->intregm_disabled |= val;
 192         s->intregm_pending &= ~val;
 193         slavio_check_interrupts(s, 1);
 194         DPRINTF("Disabled master irq mask %x, curmask %x\n", val,
 195                 s->intregm_disabled);
 196         break;
 197     case 4:
 198         s->target_cpu = val & (MAX_CPUS - 1);
 199         slavio_check_interrupts(s, 1);
 200         DPRINTF("Set master irq cpu %d\n", s->target_cpu);
 201         break;
 202     default:
 203         break;
 204     }
 205 }
 206
 207 static CPUReadMemoryFunc * const slavio_intctlm_mem_read[3] = {
 208     NULL,
 209     NULL,
 210     slavio_intctlm_mem_readl,
 211 };
 212
 213 static CPUWriteMemoryFunc * const slavio_intctlm_mem_write[3] = {
 214     NULL,
 215     NULL,
 216     slavio_intctlm_mem_writel,
 217 };
 218
 219 void slavio_pic_info(Monitor *mon, DeviceState *dev)
 220 {
 221     SysBusDevice *sd;
 222     SLAVIO_INTCTLState *s;
 223     int i;
 224
 225     sd = sysbus_from_qdev(dev);
 226     s = FROM_SYSBUS(SLAVIO_INTCTLState, sd);
 227     for (i = 0; i < MAX_CPUS; i++) {
 228         monitor_printf(mon, "per-cpu %d: pending 0x%08x\n", i,
 229                        s->slaves[i].intreg_pending);
 230     }
 231     monitor_printf(mon, "master: pending 0x%08x, disabled 0x%08x\n",
 232                    s->intregm_pending, s->intregm_disabled);
 233 }
 234
 235 void slavio_irq_info(Monitor *mon, DeviceState *dev)
 236 {
 237 #ifndef DEBUG_IRQ_COUNT
 238     monitor_printf(mon, "irq statistic code not compiled.\n");
 239 #else
 240     SysBusDevice *sd;
 241     SLAVIO_INTCTLState *s;
 242     int i;
 243     int64_t count;
 244
 245     sd = sysbus_from_qdev(dev);
 246     s = FROM_SYSBUS(SLAVIO_INTCTLState, sd);
 247     monitor_printf(mon, "IRQ statistics:\n");
 248     for (i = 0; i < 32; i++) {
 249         count = s->irq_count[i];
 250         if (count > 0)
 251             monitor_printf(mon, "%2d: %" PRId64 "\n", i, count);
 252     }
 253 #endif
 254 }
 255
 256 static const uint32_t intbit_to_level[] = {
 257     2, 3, 5, 7, 9, 11, 13, 2,   3, 5, 7, 9, 11, 13, 12, 12,
 258     6, 13, 4, 10, 8, 9, 11, 0,  0, 0, 0, 15, 15, 15, 15, 0,
 259 };
 260
 261 static void slavio_check_interrupts(SLAVIO_INTCTLState *s, int set_irqs)
 262 {
 263     uint32_t pending = s->intregm_pending, pil_pending;
 264     unsigned int i, j;
 265
 266     pending &= ~s->intregm_disabled;
 267
 268     DPRINTF("pending %x disabled %x\n", pending, s->intregm_disabled);
 269     for (i = 0; i < MAX_CPUS; i++) {
 270         pil_pending = 0;
 271
 272         /* If we are the current interrupt target, get hard interrupts */
 273         if (pending && !(s->intregm_disabled & MASTER_DISABLE) &&
 274             (i == s->target_cpu)) {
 275             for (j = 0; j < 32; j++) {
 276                 if ((pending & (1 << j)) && intbit_to_level[j]) {
 277                     pil_pending |= 1 << intbit_to_level[j];
 278                 }
 279             }
 280         }
 281
 282         /* Calculate current pending hard interrupts for display */
 283         s->slaves[i].intreg_pending &= CPU_SOFTIRQ_MASK | CPU_IRQ_INT15_IN |
 284             CPU_IRQ_TIMER_IN;
 285         if (i == s->target_cpu) {
 286             for (j = 0; j < 32; j++) {
 287                 if ((s->intregm_pending & (1 << j)) && intbit_to_level[j]) {
 288                     s->slaves[i].intreg_pending |= 1 << intbit_to_level[j];
 289                 }
 290             }
 291         }
 292
 293         /* Level 15 and CPU timer interrupts are not maskable */
 294         pil_pending |= s->slaves[i].intreg_pending &
 295             (CPU_IRQ_INT15_IN | CPU_IRQ_TIMER_IN);
 296
 297         /* Add soft interrupts */
 298         pil_pending |= (s->slaves[i].intreg_pending & CPU_SOFTIRQ_MASK) >> 16;
 299
 300         if (set_irqs) {
 301             for (j = MAX_PILS; j > 0; j--) {
 302                 if (pil_pending & (1 << j)) {
 303                     if (!(s->slaves[i].irl_out & (1 << j))) {
 304                         qemu_irq_raise(s->cpu_irqs[i][j]);
 305                     }
 306                 } else {
 307                     if (s->slaves[i].irl_out & (1 << j)) {
 308                         qemu_irq_lower(s->cpu_irqs[i][j]);
 309                     }
 310                 }
 311             }
 312         }
 313         s->slaves[i].irl_out = pil_pending;
 314     }
 315 }
 316
 317 /*
 318  * "irq" here is the bit number in the system interrupt register to
 319  * separate serial and keyboard interrupts sharing a level.
 320  */
 321 static void slavio_set_irq(void *opaque, int irq, int level)
 322 {
 323     SLAVIO_INTCTLState *s = opaque;
 324     uint32_t mask = 1 << irq;
 325     uint32_t pil = intbit_to_level[irq];
 326     unsigned int i;
 327
 328     DPRINTF("Set cpu %d irq %d -> pil %d level %d\n", s->target_cpu, irq, pil,
 329             level);
 330     if (pil > 0) {
 331         if (level) {
 332 #ifdef DEBUG_IRQ_COUNT
 333             s->irq_count[pil]++;
 334 #endif
 335             s->intregm_pending |= mask;
 336             if (pil == 15) {
 337                 for (i = 0; i < MAX_CPUS; i++) {
 338                     s->slaves[i].intreg_pending |= 1 << pil;
 339                 }
 340             }
 341         } else {
 342             s->intregm_pending &= ~mask;
 343             if (pil == 15) {
 344                 for (i = 0; i < MAX_CPUS; i++) {
 345                     s->slaves[i].intreg_pending &= ~(1 << pil);
 346                 }
 347             }
 348         }
 349         slavio_check_interrupts(s, 1);
 350     }
 351 }
 352
 353 static void slavio_set_timer_irq_cpu(void *opaque, int cpu, int level)
 354 {
 355     SLAVIO_INTCTLState *s = opaque;
 356
 357     DPRINTF("Set cpu %d local timer level %d\n", cpu, level);
 358
 359     if (level) {
 360         s->slaves[cpu].intreg_pending |= CPU_IRQ_TIMER_IN;
 361     } else {
 362         s->slaves[cpu].intreg_pending &= ~CPU_IRQ_TIMER_IN;
 363     }
 364
 365     slavio_check_interrupts(s, 1);
 366 }
 367
 368 static void slavio_set_irq_all(void *opaque, int irq, int level)
 369 {
 370     if (irq < 32) {
 371         slavio_set_irq(opaque, irq, level);
 372     } else {
 373         slavio_set_timer_irq_cpu(opaque, irq - 32, level);
 374     }
 375 }
 376
 377 static int vmstate_intctl_post_load(void *opaque, int version_id)
 378 {
 379     SLAVIO_INTCTLState *s = opaque;
 380
 381     slavio_check_interrupts(s, 0);
 382     return 0;
 383 }
 384
 385 static const VMStateDescription vmstate_intctl_cpu = {
 386     .name ="slavio_intctl_cpu",
 387     .version_id = 1,
 388     .minimum_version_id = 1,
 389     .minimum_version_id_old = 1,
 390     .fields      = (VMStateField []) {
 391         VMSTATE_UINT32(intreg_pending, SLAVIO_CPUINTCTLState),
 392         VMSTATE_END_OF_LIST()
 393     }
 394 };
 395
 396 static const VMStateDescription vmstate_intctl = {
 397     .name ="slavio_intctl",
 398     .version_id = 1,
 399     .minimum_version_id = 1,
 400     .minimum_version_id_old = 1,
 401     .post_load = vmstate_intctl_post_load,
 402     .fields      = (VMStateField []) {
 403         VMSTATE_STRUCT_ARRAY(slaves, SLAVIO_INTCTLState, MAX_CPUS, 1,
 404                              vmstate_intctl_cpu, SLAVIO_CPUINTCTLState),
 405         VMSTATE_UINT32(intregm_pending, SLAVIO_INTCTLState),
 406         VMSTATE_UINT32(intregm_disabled, SLAVIO_INTCTLState),
 407         VMSTATE_UINT32(target_cpu, SLAVIO_INTCTLState),
 408         VMSTATE_END_OF_LIST()
 409     }
 410 };
 411
 412 static void slavio_intctl_reset(void *opaque)
 413 {
 414     SLAVIO_INTCTLState *s = opaque;
 415     int i;
 416
 417     for (i = 0; i < MAX_CPUS; i++) {
 418         s->slaves[i].intreg_pending = 0;
 419         s->slaves[i].irl_out = 0;
 420     }
 421     s->intregm_disabled = ~MASTER_IRQ_MASK;
 422     s->intregm_pending = 0;
 423     s->target_cpu = 0;
 424     slavio_check_interrupts(s, 0);
 425 }
 426
 427 static int slavio_intctl_init1(SysBusDevice *dev)
 428 {
 429     SLAVIO_INTCTLState *s = FROM_SYSBUS(SLAVIO_INTCTLState, dev);
 430     int io_memory;
 431     unsigned int i, j;
 432
 433     qdev_init_gpio_in(&dev->qdev, slavio_set_irq_all, 32 + MAX_CPUS);
 434     io_memory = cpu_register_io_memory(slavio_intctlm_mem_read,
 435                                        slavio_intctlm_mem_write, s);
 436     sysbus_init_mmio(dev, INTCTLM_SIZE, io_memory);
 437
 438     for (i = 0; i < MAX_CPUS; i++) {
 439         for (j = 0; j < MAX_PILS; j++) {
 440             sysbus_init_irq(dev, &s->cpu_irqs[i][j]);
 441         }
 442         io_memory = cpu_register_io_memory(slavio_intctl_mem_read,
 443                                            slavio_intctl_mem_write,
 444                                            &s->slaves[i]);
 445         sysbus_init_mmio(dev, INTCTL_SIZE, io_memory);
 446         s->slaves[i].cpu = i;
 447         s->slaves[i].master = s;
 448     }
 449     vmstate_register(-1, &vmstate_intctl, s);
 450     qemu_register_reset(slavio_intctl_reset, s);
 451     slavio_intctl_reset(s);
 452     return 0;
 453 }
 454
 455 static SysBusDeviceInfo slavio_intctl_info = {
 456     .init = slavio_intctl_init1,
 457     .qdev.name  = "slavio_intctl",
 458     .qdev.size  = sizeof(SLAVIO_INTCTLState),
 459 };
 460
 461 static void slavio_intctl_register_devices(void)
 462 {
 463     sysbus_register_withprop(&slavio_intctl_info);
 464 }
 465
 466 device_init(slavio_intctl_register_devices)