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