hw/arm/pxa2xx_pic.c

   1 /*
   2  * Intel XScale PXA Programmable Interrupt Controller.
   3  *
   4  * Copyright (c) 2006 Openedhand Ltd.
   5  * Copyright (c) 2006 Thorsten Zitterell
   6  * Written by Andrzej Zaborowski <balrog@zabor.org>
   7  *
   8  * This code is licensed under the GPL.
   9  */
  10
  11 #include "qemu/osdep.h"
  12 #include "qapi/error.h"
  13 #include "qemu/module.h"
  14 #include "qemu/log.h"
  15 #include "cpu.h"
  16 #include "hw/arm/pxa.h"
  17 #include "hw/sysbus.h"
  18 #include "migration/vmstate.h"
  19
  20 #define ICIP    0x00    /* Interrupt Controller IRQ Pending register */
  21 #define ICMR    0x04    /* Interrupt Controller Mask register */
  22 #define ICLR    0x08    /* Interrupt Controller Level register */
  23 #define ICFP    0x0c    /* Interrupt Controller FIQ Pending register */
  24 #define ICPR    0x10    /* Interrupt Controller Pending register */
  25 #define ICCR    0x14    /* Interrupt Controller Control register */
  26 #define ICHP    0x18    /* Interrupt Controller Highest Priority register */
  27 #define IPR0    0x1c    /* Interrupt Controller Priority register 0 */
  28 #define IPR31   0x98    /* Interrupt Controller Priority register 31 */
  29 #define ICIP2   0x9c    /* Interrupt Controller IRQ Pending register 2 */
  30 #define ICMR2   0xa0    /* Interrupt Controller Mask register 2 */
  31 #define ICLR2   0xa4    /* Interrupt Controller Level register 2 */
  32 #define ICFP2   0xa8    /* Interrupt Controller FIQ Pending register 2 */
  33 #define ICPR2   0xac    /* Interrupt Controller Pending register 2 */
  34 #define IPR32   0xb0    /* Interrupt Controller Priority register 32 */
  35 #define IPR39   0xcc    /* Interrupt Controller Priority register 39 */
  36
  37 #define PXA2XX_PIC_SRCS 40
  38
  39 #define TYPE_PXA2XX_PIC "pxa2xx_pic"
  40 #define PXA2XX_PIC(obj) \
  41     OBJECT_CHECK(PXA2xxPICState, (obj), TYPE_PXA2XX_PIC)
  42
  43 typedef struct {
  44     /*< private >*/
  45     SysBusDevice parent_obj;
  46     /*< public >*/
  47
  48     MemoryRegion iomem;
  49     ARMCPU *cpu;
  50     uint32_t int_enabled[2];
  51     uint32_t int_pending[2];
  52     uint32_t is_fiq[2];
  53     uint32_t int_idle;
  54     uint32_t priority[PXA2XX_PIC_SRCS];
  55 } PXA2xxPICState;
  56
  57 static void pxa2xx_pic_update(void *opaque)
  58 {
  59     uint32_t mask[2];
  60     PXA2xxPICState *s = (PXA2xxPICState *) opaque;
  61     CPUState *cpu = CPU(s->cpu);
  62
  63     if (cpu->halted) {
  64         mask[0] = s->int_pending[0] & (s->int_enabled[0] | s->int_idle);
  65         mask[1] = s->int_pending[1] & (s->int_enabled[1] | s->int_idle);
  66         if (mask[0] || mask[1]) {
  67             cpu_interrupt(cpu, CPU_INTERRUPT_EXITTB);
  68         }
  69     }
  70
  71     mask[0] = s->int_pending[0] & s->int_enabled[0];
  72     mask[1] = s->int_pending[1] & s->int_enabled[1];
  73
  74     if ((mask[0] & s->is_fiq[0]) || (mask[1] & s->is_fiq[1])) {
  75         cpu_interrupt(cpu, CPU_INTERRUPT_FIQ);
  76     } else {
  77         cpu_reset_interrupt(cpu, CPU_INTERRUPT_FIQ);
  78     }
  79
  80     if ((mask[0] & ~s->is_fiq[0]) || (mask[1] & ~s->is_fiq[1])) {
  81         cpu_interrupt(cpu, CPU_INTERRUPT_HARD);
  82     } else {
  83         cpu_reset_interrupt(cpu, CPU_INTERRUPT_HARD);
  84     }
  85 }
  86
  87 /* Note: Here level means state of the signal on a pin, not
  88  * IRQ/FIQ distinction as in PXA Developer Manual.  */
  89 static void pxa2xx_pic_set_irq(void *opaque, int irq, int level)
  90 {
  91     PXA2xxPICState *s = (PXA2xxPICState *) opaque;
  92     int int_set = (irq >= 32);
  93     irq &= 31;
  94
  95     if (level)
  96         s->int_pending[int_set] |= 1 << irq;
  97     else
  98         s->int_pending[int_set] &= ~(1 << irq);
  99
 100     pxa2xx_pic_update(opaque);
 101 }
 102
 103 static inline uint32_t pxa2xx_pic_highest(PXA2xxPICState *s) {
 104     int i, int_set, irq;
 105     uint32_t bit, mask[2];
 106     uint32_t ichp = 0x003f003f; /* Both IDs invalid */
 107
 108     mask[0] = s->int_pending[0] & s->int_enabled[0];
 109     mask[1] = s->int_pending[1] & s->int_enabled[1];
 110
 111     for (i = PXA2XX_PIC_SRCS - 1; i >= 0; i --) {
 112         irq = s->priority[i] & 0x3f;
 113         if ((s->priority[i] & (1U << 31)) && irq < PXA2XX_PIC_SRCS) {
 114             /* Source peripheral ID is valid.  */
 115             bit = 1 << (irq & 31);
 116             int_set = (irq >= 32);
 117
 118             if (mask[int_set] & bit & s->is_fiq[int_set]) {
 119                 /* FIQ asserted */
 120                 ichp &= 0xffff0000;
 121                 ichp |= (1 << 15) | irq;
 122             }
 123
 124             if (mask[int_set] & bit & ~s->is_fiq[int_set]) {
 125                 /* IRQ asserted */
 126                 ichp &= 0x0000ffff;
 127                 ichp |= (1U << 31) | (irq << 16);
 128             }
 129         }
 130     }
 131
 132     return ichp;
 133 }
 134
 135 static uint64_t pxa2xx_pic_mem_read(void *opaque, hwaddr offset,
 136                                     unsigned size)
 137 {
 138     PXA2xxPICState *s = (PXA2xxPICState *) opaque;
 139
 140     switch (offset) {
 141     case ICIP:  /* IRQ Pending register */
 142         return s->int_pending[0] & ~s->is_fiq[0] & s->int_enabled[0];
 143     case ICIP2: /* IRQ Pending register 2 */
 144         return s->int_pending[1] & ~s->is_fiq[1] & s->int_enabled[1];
 145     case ICMR:  /* Mask register */
 146         return s->int_enabled[0];
 147     case ICMR2: /* Mask register 2 */
 148         return s->int_enabled[1];
 149     case ICLR:  /* Level register */
 150         return s->is_fiq[0];
 151     case ICLR2: /* Level register 2 */
 152         return s->is_fiq[1];
 153     case ICCR:  /* Idle mask */
 154         return (s->int_idle == 0);
 155     case ICFP:  /* FIQ Pending register */
 156         return s->int_pending[0] & s->is_fiq[0] & s->int_enabled[0];
 157     case ICFP2: /* FIQ Pending register 2 */
 158         return s->int_pending[1] & s->is_fiq[1] & s->int_enabled[1];
 159     case ICPR:  /* Pending register */
 160         return s->int_pending[0];
 161     case ICPR2: /* Pending register 2 */
 162         return s->int_pending[1];
 163     case IPR0  ... IPR31:
 164         return s->priority[0  + ((offset - IPR0 ) >> 2)];
 165     case IPR32 ... IPR39:
 166         return s->priority[32 + ((offset - IPR32) >> 2)];
 167     case ICHP:  /* Highest Priority register */
 168         return pxa2xx_pic_highest(s);
 169     default:
 170         qemu_log_mask(LOG_GUEST_ERROR,
 171                       "pxa2xx_pic_mem_read: bad register offset 0x%" HWADDR_PRIx
 172                       "\n", offset);
 173         return 0;
 174     }
 175 }
 176
 177 static void pxa2xx_pic_mem_write(void *opaque, hwaddr offset,
 178                                  uint64_t value, unsigned size)
 179 {
 180     PXA2xxPICState *s = (PXA2xxPICState *) opaque;
 181
 182     switch (offset) {
 183     case ICMR:  /* Mask register */
 184         s->int_enabled[0] = value;
 185         break;
 186     case ICMR2: /* Mask register 2 */
 187         s->int_enabled[1] = value;
 188         break;
 189     case ICLR:  /* Level register */
 190         s->is_fiq[0] = value;
 191         break;
 192     case ICLR2: /* Level register 2 */
 193         s->is_fiq[1] = value;
 194         break;
 195     case ICCR:  /* Idle mask */
 196         s->int_idle = (value & 1) ? 0 : ~0;
 197         break;
 198     case IPR0  ... IPR31:
 199         s->priority[0  + ((offset - IPR0 ) >> 2)] = value & 0x8000003f;
 200         break;
 201     case IPR32 ... IPR39:
 202         s->priority[32 + ((offset - IPR32) >> 2)] = value & 0x8000003f;
 203         break;
 204     default:
 205         qemu_log_mask(LOG_GUEST_ERROR,
 206                       "pxa2xx_pic_mem_write: bad register offset 0x%"
 207                       HWADDR_PRIx "\n", offset);
 208         return;
 209     }
 210     pxa2xx_pic_update(opaque);
 211 }
 212
 213 /* Interrupt Controller Coprocessor Space Register Mapping */
 214 static const int pxa2xx_cp_reg_map[0x10] = {
 215     [0x0 ... 0xf] = -1,
 216     [0x0] = ICIP,
 217     [0x1] = ICMR,
 218     [0x2] = ICLR,
 219     [0x3] = ICFP,
 220     [0x4] = ICPR,
 221     [0x5] = ICHP,
 222     [0x6] = ICIP2,
 223     [0x7] = ICMR2,
 224     [0x8] = ICLR2,
 225     [0x9] = ICFP2,
 226     [0xa] = ICPR2,
 227 };
 228
 229 static uint64_t pxa2xx_pic_cp_read(CPUARMState *env, const ARMCPRegInfo *ri)
 230 {
 231     int offset = pxa2xx_cp_reg_map[ri->crn];
 232     return pxa2xx_pic_mem_read(ri->opaque, offset, 4);
 233 }
 234
 235 static void pxa2xx_pic_cp_write(CPUARMState *env, const ARMCPRegInfo *ri,
 236                                 uint64_t value)
 237 {
 238     int offset = pxa2xx_cp_reg_map[ri->crn];
 239     pxa2xx_pic_mem_write(ri->opaque, offset, value, 4);
 240 }
 241
 242 #define REGINFO_FOR_PIC_CP(NAME, CRN) \
 243     { .name = NAME, .cp = 6, .crn = CRN, .crm = 0, .opc1 = 0, .opc2 = 0, \
 244       .access = PL1_RW, .type = ARM_CP_IO, \
 245       .readfn = pxa2xx_pic_cp_read, .writefn = pxa2xx_pic_cp_write }
 246
 247 static const ARMCPRegInfo pxa_pic_cp_reginfo[] = {
 248     REGINFO_FOR_PIC_CP("ICIP", 0),
 249     REGINFO_FOR_PIC_CP("ICMR", 1),
 250     REGINFO_FOR_PIC_CP("ICLR", 2),
 251     REGINFO_FOR_PIC_CP("ICFP", 3),
 252     REGINFO_FOR_PIC_CP("ICPR", 4),
 253     REGINFO_FOR_PIC_CP("ICHP", 5),
 254     REGINFO_FOR_PIC_CP("ICIP2", 6),
 255     REGINFO_FOR_PIC_CP("ICMR2", 7),
 256     REGINFO_FOR_PIC_CP("ICLR2", 8),
 257     REGINFO_FOR_PIC_CP("ICFP2", 9),
 258     REGINFO_FOR_PIC_CP("ICPR2", 0xa),
 259     REGINFO_SENTINEL
 260 };
 261
 262 static const MemoryRegionOps pxa2xx_pic_ops = {
 263     .read = pxa2xx_pic_mem_read,
 264     .write = pxa2xx_pic_mem_write,
 265     .endianness = DEVICE_NATIVE_ENDIAN,
 266 };
 267
 268 static int pxa2xx_pic_post_load(void *opaque, int version_id)
 269 {
 270     pxa2xx_pic_update(opaque);
 271     return 0;
 272 }
 273
 274 DeviceState *pxa2xx_pic_init(hwaddr base, ARMCPU *cpu)
 275 {
 276     DeviceState *dev = qdev_new(TYPE_PXA2XX_PIC);
 277     PXA2xxPICState *s = PXA2XX_PIC(dev);
 278
 279     s->cpu = cpu;
 280
 281     s->int_pending[0] = 0;
 282     s->int_pending[1] = 0;
 283     s->int_enabled[0] = 0;
 284     s->int_enabled[1] = 0;
 285     s->is_fiq[0] = 0;
 286     s->is_fiq[1] = 0;
 287
 288     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
 289
 290     qdev_init_gpio_in(dev, pxa2xx_pic_set_irq, PXA2XX_PIC_SRCS);
 291
 292     /* Enable IC memory-mapped registers access.  */
 293     memory_region_init_io(&s->iomem, OBJECT(s), &pxa2xx_pic_ops, s,
 294                           "pxa2xx-pic", 0x00100000);
 295     sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);
 296     sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);
 297
 298     /* Enable IC coprocessor access.  */
 299     define_arm_cp_regs_with_opaque(cpu, pxa_pic_cp_reginfo, s);
 300
 301     return dev;
 302 }
 303
 304 static VMStateDescription vmstate_pxa2xx_pic_regs = {
 305     .name = "pxa2xx_pic",
 306     .version_id = 0,
 307     .minimum_version_id = 0,
 308     .post_load = pxa2xx_pic_post_load,
 309     .fields = (VMStateField[]) {
 310         VMSTATE_UINT32_ARRAY(int_enabled, PXA2xxPICState, 2),
 311         VMSTATE_UINT32_ARRAY(int_pending, PXA2xxPICState, 2),
 312         VMSTATE_UINT32_ARRAY(is_fiq, PXA2xxPICState, 2),
 313         VMSTATE_UINT32(int_idle, PXA2xxPICState),
 314         VMSTATE_UINT32_ARRAY(priority, PXA2xxPICState, PXA2XX_PIC_SRCS),
 315         VMSTATE_END_OF_LIST(),
 316     },
 317 };
 318
 319 static void pxa2xx_pic_class_init(ObjectClass *klass, void *data)
 320 {
 321     DeviceClass *dc = DEVICE_CLASS(klass);
 322
 323     dc->desc = "PXA2xx PIC";
 324     dc->vmsd = &vmstate_pxa2xx_pic_regs;
 325 }
 326
 327 static const TypeInfo pxa2xx_pic_info = {
 328     .name          = TYPE_PXA2XX_PIC,
 329     .parent        = TYPE_SYS_BUS_DEVICE,
 330     .instance_size = sizeof(PXA2xxPICState),
 331     .class_init    = pxa2xx_pic_class_init,
 332 };
 333
 334 static void pxa2xx_pic_register_types(void)
 335 {
 336     type_register_static(&pxa2xx_pic_info);
 337 }
 338
 339 type_init(pxa2xx_pic_register_types)