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 #include "trace.h"
  29
  30 //#define DEBUG_IRQ_COUNT
  31
  32 /*
  33  * Registers of interrupt controller in sun4m.
  34  *
  35  * This is the interrupt controller part of chip STP2001 (Slave I/O), also
  36  * produced as NCR89C105. See
  37  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C105.txt
  38  *
  39  * There is a system master controller and one for each cpu.
  40  *
  41  */
  42
  43 #define MAX_CPUS 16
  44 #define MAX_PILS 16
  45
  46 struct SLAVIO_INTCTLState;
  47
  48 typedef struct SLAVIO_CPUINTCTLState {
  49     struct SLAVIO_INTCTLState *master;
  50     uint32_t intreg_pending;
  51     uint32_t cpu;
  52     uint32_t irl_out;
  53 } SLAVIO_CPUINTCTLState;
  54
  55 typedef struct SLAVIO_INTCTLState {
  56     SysBusDevice busdev;
  57 #ifdef DEBUG_IRQ_COUNT
  58     uint64_t irq_count[32];
  59 #endif
  60     qemu_irq cpu_irqs[MAX_CPUS][MAX_PILS];
  61     SLAVIO_CPUINTCTLState slaves[MAX_CPUS];
  62     uint32_t intregm_pending;
  63     uint32_t intregm_disabled;
  64     uint32_t target_cpu;
  65 } SLAVIO_INTCTLState;
  66
  67 #define INTCTL_MAXADDR 0xf
  68 #define INTCTL_SIZE (INTCTL_MAXADDR + 1)
  69 #define INTCTLM_SIZE 0x14
  70 #define MASTER_IRQ_MASK ~0x0fa2007f
  71 #define MASTER_DISABLE 0x80000000
  72 #define CPU_SOFTIRQ_MASK 0xfffe0000
  73 #define CPU_IRQ_INT15_IN (1 << 15)
  74 #define CPU_IRQ_TIMER_IN (1 << 14)
  75
  76 static void slavio_check_interrupts(SLAVIO_INTCTLState *s, int set_irqs);
  77
  78 // per-cpu interrupt controller
  79 static uint32_t slavio_intctl_mem_readl(void *opaque, target_phys_addr_t addr)
  80 {
  81     SLAVIO_CPUINTCTLState *s = opaque;
  82     uint32_t saddr, ret;
  83
  84     saddr = addr >> 2;
  85     switch (saddr) {
  86     case 0:
  87         ret = s->intreg_pending;
  88         break;
  89     default:
  90         ret = 0;
  91         break;
  92     }
  93     trace_slavio_intctl_mem_readl(s->cpu, addr, ret);
  94
  95     return ret;
  96 }
  97
  98 static void slavio_intctl_mem_writel(void *opaque, target_phys_addr_t addr,
  99                                      uint32_t val)
 100 {
 101     SLAVIO_CPUINTCTLState *s = opaque;
 102     uint32_t saddr;
 103
 104     saddr = addr >> 2;
 105     trace_slavio_intctl_mem_writel(s->cpu, addr, val);
 106     switch (saddr) {
 107     case 1: // clear pending softints
 108         val &= CPU_SOFTIRQ_MASK | CPU_IRQ_INT15_IN;
 109         s->intreg_pending &= ~val;
 110         slavio_check_interrupts(s->master, 1);
 111         trace_slavio_intctl_mem_writel_clear(s->cpu, val, s->intreg_pending);
 112         break;
 113     case 2: // set softint
 114         val &= CPU_SOFTIRQ_MASK;
 115         s->intreg_pending |= val;
 116         slavio_check_interrupts(s->master, 1);
 117         trace_slavio_intctl_mem_writel_set(s->cpu, val, s->intreg_pending);
 118         break;
 119     default:
 120         break;
 121     }
 122 }
 123
 124 static CPUReadMemoryFunc * const slavio_intctl_mem_read[3] = {
 125     NULL,
 126     NULL,
 127     slavio_intctl_mem_readl,
 128 };
 129
 130 static CPUWriteMemoryFunc * const slavio_intctl_mem_write[3] = {
 131     NULL,
 132     NULL,
 133     slavio_intctl_mem_writel,
 134 };
 135
 136 // master system interrupt controller
 137 static uint32_t slavio_intctlm_mem_readl(void *opaque, target_phys_addr_t addr)
 138 {
 139     SLAVIO_INTCTLState *s = opaque;
 140     uint32_t saddr, ret;
 141
 142     saddr = addr >> 2;
 143     switch (saddr) {
 144     case 0:
 145         ret = s->intregm_pending & ~MASTER_DISABLE;
 146         break;
 147     case 1:
 148         ret = s->intregm_disabled & MASTER_IRQ_MASK;
 149         break;
 150     case 4:
 151         ret = s->target_cpu;
 152         break;
 153     default:
 154         ret = 0;
 155         break;
 156     }
 157     trace_slavio_intctlm_mem_readl(addr, ret);
 158
 159     return ret;
 160 }
 161
 162 static void slavio_intctlm_mem_writel(void *opaque, target_phys_addr_t addr,
 163                                       uint32_t val)
 164 {
 165     SLAVIO_INTCTLState *s = opaque;
 166     uint32_t saddr;
 167
 168     saddr = addr >> 2;
 169     trace_slavio_intctlm_mem_writel(addr, val);
 170     switch (saddr) {
 171     case 2: // clear (enable)
 172         // Force clear unused bits
 173         val &= MASTER_IRQ_MASK;
 174         s->intregm_disabled &= ~val;
 175         trace_slavio_intctlm_mem_writel_enable(val, s->intregm_disabled);
 176         slavio_check_interrupts(s, 1);
 177         break;
 178     case 3: // set (disable; doesn't affect pending)
 179         // Force clear unused bits
 180         val &= MASTER_IRQ_MASK;
 181         s->intregm_disabled |= val;
 182         slavio_check_interrupts(s, 1);
 183         trace_slavio_intctlm_mem_writel_disable(val, s->intregm_disabled);
 184         break;
 185     case 4:
 186         s->target_cpu = val & (MAX_CPUS - 1);
 187         slavio_check_interrupts(s, 1);
 188         trace_slavio_intctlm_mem_writel_target(s->target_cpu);
 189         break;
 190     default:
 191         break;
 192     }
 193 }
 194
 195 static CPUReadMemoryFunc * const slavio_intctlm_mem_read[3] = {
 196     NULL,
 197     NULL,
 198     slavio_intctlm_mem_readl,
 199 };
 200
 201 static CPUWriteMemoryFunc * const slavio_intctlm_mem_write[3] = {
 202     NULL,
 203     NULL,
 204     slavio_intctlm_mem_writel,
 205 };
 206
 207 void slavio_pic_info(Monitor *mon, DeviceState *dev)
 208 {
 209     SysBusDevice *sd;
 210     SLAVIO_INTCTLState *s;
 211     int i;
 212
 213     sd = sysbus_from_qdev(dev);
 214     s = FROM_SYSBUS(SLAVIO_INTCTLState, sd);
 215     for (i = 0; i < MAX_CPUS; i++) {
 216         monitor_printf(mon, "per-cpu %d: pending 0x%08x\n", i,
 217                        s->slaves[i].intreg_pending);
 218     }
 219     monitor_printf(mon, "master: pending 0x%08x, disabled 0x%08x\n",
 220                    s->intregm_pending, s->intregm_disabled);
 221 }
 222
 223 void slavio_irq_info(Monitor *mon, DeviceState *dev)
 224 {
 225 #ifndef DEBUG_IRQ_COUNT
 226     monitor_printf(mon, "irq statistic code not compiled.\n");
 227 #else
 228     SysBusDevice *sd;
 229     SLAVIO_INTCTLState *s;
 230     int i;
 231     int64_t count;
 232
 233     sd = sysbus_from_qdev(dev);
 234     s = FROM_SYSBUS(SLAVIO_INTCTLState, sd);
 235     monitor_printf(mon, "IRQ statistics:\n");
 236     for (i = 0; i < 32; i++) {
 237         count = s->irq_count[i];
 238         if (count > 0)
 239             monitor_printf(mon, "%2d: %" PRId64 "\n", i, count);
 240     }
 241 #endif
 242 }
 243
 244 static const uint32_t intbit_to_level[] = {
 245     2, 3, 5, 7, 9, 11, 13, 2,   3, 5, 7, 9, 11, 13, 12, 12,
 246     6, 13, 4, 10, 8, 9, 11, 0,  0, 0, 0, 15, 15, 15, 15, 0,
 247 };
 248
 249 static void slavio_check_interrupts(SLAVIO_INTCTLState *s, int set_irqs)
 250 {
 251     uint32_t pending = s->intregm_pending, pil_pending;
 252     unsigned int i, j;
 253
 254     pending &= ~s->intregm_disabled;
 255
 256     trace_slavio_check_interrupts(pending, s->intregm_disabled);
 257     for (i = 0; i < MAX_CPUS; i++) {
 258         pil_pending = 0;
 259
 260         /* If we are the current interrupt target, get hard interrupts */
 261         if (pending && !(s->intregm_disabled & MASTER_DISABLE) &&
 262             (i == s->target_cpu)) {
 263             for (j = 0; j < 32; j++) {
 264                 if ((pending & (1 << j)) && intbit_to_level[j]) {
 265                     pil_pending |= 1 << intbit_to_level[j];
 266                 }
 267             }
 268         }
 269
 270         /* Calculate current pending hard interrupts for display */
 271         s->slaves[i].intreg_pending &= CPU_SOFTIRQ_MASK | CPU_IRQ_INT15_IN |
 272             CPU_IRQ_TIMER_IN;
 273         if (i == s->target_cpu) {
 274             for (j = 0; j < 32; j++) {
 275                 if ((s->intregm_pending & (1 << j)) && intbit_to_level[j]) {
 276                     s->slaves[i].intreg_pending |= 1 << intbit_to_level[j];
 277                 }
 278             }
 279         }
 280
 281         /* Level 15 and CPU timer interrupts are only masked when
 282            the MASTER_DISABLE bit is set */
 283         if (!(s->intregm_disabled & MASTER_DISABLE)) {
 284             pil_pending |= s->slaves[i].intreg_pending &
 285                 (CPU_IRQ_INT15_IN | CPU_IRQ_TIMER_IN);
 286         }
 287
 288         /* Add soft interrupts */
 289         pil_pending |= (s->slaves[i].intreg_pending & CPU_SOFTIRQ_MASK) >> 16;
 290
 291         if (set_irqs) {
 292             /* Since there is not really an interrupt 0 (and pil_pending
 293              * and irl_out bit zero are thus always zero) there is no need
 294              * to do anything with cpu_irqs[i][0] and it is OK not to do
 295              * the j=0 iteration of this loop.
 296              */
 297             for (j = MAX_PILS-1; j > 0; j--) {
 298                 if (pil_pending & (1 << j)) {
 299                     if (!(s->slaves[i].irl_out & (1 << j))) {
 300                         qemu_irq_raise(s->cpu_irqs[i][j]);
 301                     }
 302                 } else {
 303                     if (s->slaves[i].irl_out & (1 << j)) {
 304                         qemu_irq_lower(s->cpu_irqs[i][j]);
 305                     }
 306                 }
 307             }
 308         }
 309         s->slaves[i].irl_out = pil_pending;
 310     }
 311 }
 312
 313 /*
 314  * "irq" here is the bit number in the system interrupt register to
 315  * separate serial and keyboard interrupts sharing a level.
 316  */
 317 static void slavio_set_irq(void *opaque, int irq, int level)
 318 {
 319     SLAVIO_INTCTLState *s = opaque;
 320     uint32_t mask = 1 << irq;
 321     uint32_t pil = intbit_to_level[irq];
 322     unsigned int i;
 323
 324     trace_slavio_set_irq(s->target_cpu, irq, pil, level);
 325     if (pil > 0) {
 326         if (level) {
 327 #ifdef DEBUG_IRQ_COUNT
 328             s->irq_count[pil]++;
 329 #endif
 330             s->intregm_pending |= mask;
 331             if (pil == 15) {
 332                 for (i = 0; i < MAX_CPUS; i++) {
 333                     s->slaves[i].intreg_pending |= 1 << pil;
 334                 }
 335             }
 336         } else {
 337             s->intregm_pending &= ~mask;
 338             if (pil == 15) {
 339                 for (i = 0; i < MAX_CPUS; i++) {
 340                     s->slaves[i].intreg_pending &= ~(1 << pil);
 341                 }
 342             }
 343         }
 344         slavio_check_interrupts(s, 1);
 345     }
 346 }
 347
 348 static void slavio_set_timer_irq_cpu(void *opaque, int cpu, int level)
 349 {
 350     SLAVIO_INTCTLState *s = opaque;
 351
 352     trace_slavio_set_timer_irq_cpu(cpu, level);
 353
 354     if (level) {
 355         s->slaves[cpu].intreg_pending |= CPU_IRQ_TIMER_IN;
 356     } else {
 357         s->slaves[cpu].intreg_pending &= ~CPU_IRQ_TIMER_IN;
 358     }
 359
 360     slavio_check_interrupts(s, 1);
 361 }
 362
 363 static void slavio_set_irq_all(void *opaque, int irq, int level)
 364 {
 365     if (irq < 32) {
 366         slavio_set_irq(opaque, irq, level);
 367     } else {
 368         slavio_set_timer_irq_cpu(opaque, irq - 32, level);
 369     }
 370 }
 371
 372 static int vmstate_intctl_post_load(void *opaque, int version_id)
 373 {
 374     SLAVIO_INTCTLState *s = opaque;
 375
 376     slavio_check_interrupts(s, 0);
 377     return 0;
 378 }
 379
 380 static const VMStateDescription vmstate_intctl_cpu = {
 381     .name ="slavio_intctl_cpu",
 382     .version_id = 1,
 383     .minimum_version_id = 1,
 384     .minimum_version_id_old = 1,
 385     .fields      = (VMStateField []) {
 386         VMSTATE_UINT32(intreg_pending, SLAVIO_CPUINTCTLState),
 387         VMSTATE_END_OF_LIST()
 388     }
 389 };
 390
 391 static const VMStateDescription vmstate_intctl = {
 392     .name ="slavio_intctl",
 393     .version_id = 1,
 394     .minimum_version_id = 1,
 395     .minimum_version_id_old = 1,
 396     .post_load = vmstate_intctl_post_load,
 397     .fields      = (VMStateField []) {
 398         VMSTATE_STRUCT_ARRAY(slaves, SLAVIO_INTCTLState, MAX_CPUS, 1,
 399                              vmstate_intctl_cpu, SLAVIO_CPUINTCTLState),
 400         VMSTATE_UINT32(intregm_pending, SLAVIO_INTCTLState),
 401         VMSTATE_UINT32(intregm_disabled, SLAVIO_INTCTLState),
 402         VMSTATE_UINT32(target_cpu, SLAVIO_INTCTLState),
 403         VMSTATE_END_OF_LIST()
 404     }
 405 };
 406
 407 static void slavio_intctl_reset(DeviceState *d)
 408 {
 409     SLAVIO_INTCTLState *s = container_of(d, SLAVIO_INTCTLState, busdev.qdev);
 410     int i;
 411
 412     for (i = 0; i < MAX_CPUS; i++) {
 413         s->slaves[i].intreg_pending = 0;
 414         s->slaves[i].irl_out = 0;
 415     }
 416     s->intregm_disabled = ~MASTER_IRQ_MASK;
 417     s->intregm_pending = 0;
 418     s->target_cpu = 0;
 419     slavio_check_interrupts(s, 0);
 420 }
 421
 422 static int slavio_intctl_init1(SysBusDevice *dev)
 423 {
 424     SLAVIO_INTCTLState *s = FROM_SYSBUS(SLAVIO_INTCTLState, dev);
 425     int io_memory;
 426     unsigned int i, j;
 427
 428     qdev_init_gpio_in(&dev->qdev, slavio_set_irq_all, 32 + MAX_CPUS);
 429     io_memory = cpu_register_io_memory(slavio_intctlm_mem_read,
 430                                        slavio_intctlm_mem_write, s,
 431                                        DEVICE_NATIVE_ENDIAN);
 432     sysbus_init_mmio(dev, INTCTLM_SIZE, io_memory);
 433
 434     for (i = 0; i < MAX_CPUS; i++) {
 435         for (j = 0; j < MAX_PILS; j++) {
 436             sysbus_init_irq(dev, &s->cpu_irqs[i][j]);
 437         }
 438         io_memory = cpu_register_io_memory(slavio_intctl_mem_read,
 439                                            slavio_intctl_mem_write,
 440                                            &s->slaves[i],
 441                                            DEVICE_NATIVE_ENDIAN);
 442         sysbus_init_mmio(dev, INTCTL_SIZE, io_memory);
 443         s->slaves[i].cpu = i;
 444         s->slaves[i].master = s;
 445     }
 446
 447     return 0;
 448 }
 449
 450 static SysBusDeviceInfo slavio_intctl_info = {
 451     .init = slavio_intctl_init1,
 452     .qdev.name  = "slavio_intctl",
 453     .qdev.size  = sizeof(SLAVIO_INTCTLState),
 454     .qdev.vmsd  = &vmstate_intctl,
 455     .qdev.reset = slavio_intctl_reset,
 456 };
 457
 458 static void slavio_intctl_register_devices(void)
 459 {
 460     sysbus_register_withprop(&slavio_intctl_info);
 461 }
 462
 463 device_init(slavio_intctl_register_devices)