hw/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 "hw.h"
  12 #include "pxa.h"
  13 #include "sysbus.h"
  14
  15 #define ICIP    0x00    /* Interrupt Controller IRQ Pending register */
  16 #define ICMR    0x04    /* Interrupt Controller Mask register */
  17 #define ICLR    0x08    /* Interrupt Controller Level register */
  18 #define ICFP    0x0c    /* Interrupt Controller FIQ Pending register */
  19 #define ICPR    0x10    /* Interrupt Controller Pending register */
  20 #define ICCR    0x14    /* Interrupt Controller Control register */
  21 #define ICHP    0x18    /* Interrupt Controller Highest Priority register */
  22 #define IPR0    0x1c    /* Interrupt Controller Priority register 0 */
  23 #define IPR31   0x98    /* Interrupt Controller Priority register 31 */
  24 #define ICIP2   0x9c    /* Interrupt Controller IRQ Pending register 2 */
  25 #define ICMR2   0xa0    /* Interrupt Controller Mask register 2 */
  26 #define ICLR2   0xa4    /* Interrupt Controller Level register 2 */
  27 #define ICFP2   0xa8    /* Interrupt Controller FIQ Pending register 2 */
  28 #define ICPR2   0xac    /* Interrupt Controller Pending register 2 */
  29 #define IPR32   0xb0    /* Interrupt Controller Priority register 32 */
  30 #define IPR39   0xcc    /* Interrupt Controller Priority register 39 */
  31
  32 #define PXA2XX_PIC_SRCS 40
  33
  34 typedef struct {
  35     SysBusDevice busdev;
  36     MemoryRegion iomem;
  37     ARMCPU *cpu;
  38     uint32_t int_enabled[2];
  39     uint32_t int_pending[2];
  40     uint32_t is_fiq[2];
  41     uint32_t int_idle;
  42     uint32_t priority[PXA2XX_PIC_SRCS];
  43 } PXA2xxPICState;
  44
  45 static void pxa2xx_pic_update(void *opaque)
  46 {
  47     uint32_t mask[2];
  48     PXA2xxPICState *s = (PXA2xxPICState *) opaque;
  49
  50     if (s->cpu->env.halted) {
  51         mask[0] = s->int_pending[0] & (s->int_enabled[0] | s->int_idle);
  52         mask[1] = s->int_pending[1] & (s->int_enabled[1] | s->int_idle);
  53         if (mask[0] || mask[1]) {
  54             cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_EXITTB);
  55         }
  56     }
  57
  58     mask[0] = s->int_pending[0] & s->int_enabled[0];
  59     mask[1] = s->int_pending[1] & s->int_enabled[1];
  60
  61     if ((mask[0] & s->is_fiq[0]) || (mask[1] & s->is_fiq[1])) {
  62         cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_FIQ);
  63     } else {
  64         cpu_reset_interrupt(&s->cpu->env, CPU_INTERRUPT_FIQ);
  65     }
  66
  67     if ((mask[0] & ~s->is_fiq[0]) || (mask[1] & ~s->is_fiq[1])) {
  68         cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_HARD);
  69     } else {
  70         cpu_reset_interrupt(&s->cpu->env, CPU_INTERRUPT_HARD);
  71     }
  72 }
  73
  74 /* Note: Here level means state of the signal on a pin, not
  75  * IRQ/FIQ distinction as in PXA Developer Manual.  */
  76 static void pxa2xx_pic_set_irq(void *opaque, int irq, int level)
  77 {
  78     PXA2xxPICState *s = (PXA2xxPICState *) opaque;
  79     int int_set = (irq >= 32);
  80     irq &= 31;
  81
  82     if (level)
  83         s->int_pending[int_set] |= 1 << irq;
  84     else
  85         s->int_pending[int_set] &= ~(1 << irq);
  86
  87     pxa2xx_pic_update(opaque);
  88 }
  89
  90 static inline uint32_t pxa2xx_pic_highest(PXA2xxPICState *s) {
  91     int i, int_set, irq;
  92     uint32_t bit, mask[2];
  93     uint32_t ichp = 0x003f003f; /* Both IDs invalid */
  94
  95     mask[0] = s->int_pending[0] & s->int_enabled[0];
  96     mask[1] = s->int_pending[1] & s->int_enabled[1];
  97
  98     for (i = PXA2XX_PIC_SRCS - 1; i >= 0; i --) {
  99         irq = s->priority[i] & 0x3f;
 100         if ((s->priority[i] & (1 << 31)) && irq < PXA2XX_PIC_SRCS) {
 101             /* Source peripheral ID is valid.  */
 102             bit = 1 << (irq & 31);
 103             int_set = (irq >= 32);
 104
 105             if (mask[int_set] & bit & s->is_fiq[int_set]) {
 106                 /* FIQ asserted */
 107                 ichp &= 0xffff0000;
 108                 ichp |= (1 << 15) | irq;
 109             }
 110
 111             if (mask[int_set] & bit & ~s->is_fiq[int_set]) {
 112                 /* IRQ asserted */
 113                 ichp &= 0x0000ffff;
 114                 ichp |= (1 << 31) | (irq << 16);
 115             }
 116         }
 117     }
 118
 119     return ichp;
 120 }
 121
 122 static uint64_t pxa2xx_pic_mem_read(void *opaque, target_phys_addr_t offset,
 123                                     unsigned size)
 124 {
 125     PXA2xxPICState *s = (PXA2xxPICState *) opaque;
 126
 127     switch (offset) {
 128     case ICIP:  /* IRQ Pending register */
 129         return s->int_pending[0] & ~s->is_fiq[0] & s->int_enabled[0];
 130     case ICIP2: /* IRQ Pending register 2 */
 131         return s->int_pending[1] & ~s->is_fiq[1] & s->int_enabled[1];
 132     case ICMR:  /* Mask register */
 133         return s->int_enabled[0];
 134     case ICMR2: /* Mask register 2 */
 135         return s->int_enabled[1];
 136     case ICLR:  /* Level register */
 137         return s->is_fiq[0];
 138     case ICLR2: /* Level register 2 */
 139         return s->is_fiq[1];
 140     case ICCR:  /* Idle mask */
 141         return (s->int_idle == 0);
 142     case ICFP:  /* FIQ Pending register */
 143         return s->int_pending[0] & s->is_fiq[0] & s->int_enabled[0];
 144     case ICFP2: /* FIQ Pending register 2 */
 145         return s->int_pending[1] & s->is_fiq[1] & s->int_enabled[1];
 146     case ICPR:  /* Pending register */
 147         return s->int_pending[0];
 148     case ICPR2: /* Pending register 2 */
 149         return s->int_pending[1];
 150     case IPR0  ... IPR31:
 151         return s->priority[0  + ((offset - IPR0 ) >> 2)];
 152     case IPR32 ... IPR39:
 153         return s->priority[32 + ((offset - IPR32) >> 2)];
 154     case ICHP:  /* Highest Priority register */
 155         return pxa2xx_pic_highest(s);
 156     default:
 157         printf("%s: Bad register offset " REG_FMT "\n", __FUNCTION__, offset);
 158         return 0;
 159     }
 160 }
 161
 162 static void pxa2xx_pic_mem_write(void *opaque, target_phys_addr_t offset,
 163                                  uint64_t value, unsigned size)
 164 {
 165     PXA2xxPICState *s = (PXA2xxPICState *) opaque;
 166
 167     switch (offset) {
 168     case ICMR:  /* Mask register */
 169         s->int_enabled[0] = value;
 170         break;
 171     case ICMR2: /* Mask register 2 */
 172         s->int_enabled[1] = value;
 173         break;
 174     case ICLR:  /* Level register */
 175         s->is_fiq[0] = value;
 176         break;
 177     case ICLR2: /* Level register 2 */
 178         s->is_fiq[1] = value;
 179         break;
 180     case ICCR:  /* Idle mask */
 181         s->int_idle = (value & 1) ? 0 : ~0;
 182         break;
 183     case IPR0  ... IPR31:
 184         s->priority[0  + ((offset - IPR0 ) >> 2)] = value & 0x8000003f;
 185         break;
 186     case IPR32 ... IPR39:
 187         s->priority[32 + ((offset - IPR32) >> 2)] = value & 0x8000003f;
 188         break;
 189     default:
 190         printf("%s: Bad register offset " REG_FMT "\n", __FUNCTION__, offset);
 191         return;
 192     }
 193     pxa2xx_pic_update(opaque);
 194 }
 195
 196 /* Interrupt Controller Coprocessor Space Register Mapping */
 197 static const int pxa2xx_cp_reg_map[0x10] = {
 198     [0x0 ... 0xf] = -1,
 199     [0x0] = ICIP,
 200     [0x1] = ICMR,
 201     [0x2] = ICLR,
 202     [0x3] = ICFP,
 203     [0x4] = ICPR,
 204     [0x5] = ICHP,
 205     [0x6] = ICIP2,
 206     [0x7] = ICMR2,
 207     [0x8] = ICLR2,
 208     [0x9] = ICFP2,
 209     [0xa] = ICPR2,
 210 };
 211
 212 static uint32_t pxa2xx_pic_cp_read(void *opaque, int op2, int reg, int crm)
 213 {
 214     target_phys_addr_t offset;
 215
 216     if (pxa2xx_cp_reg_map[reg] == -1) {
 217         printf("%s: Bad register 0x%x\n", __FUNCTION__, reg);
 218         return 0;
 219     }
 220
 221     offset = pxa2xx_cp_reg_map[reg];
 222     return pxa2xx_pic_mem_read(opaque, offset, 4);
 223 }
 224
 225 static void pxa2xx_pic_cp_write(void *opaque, int op2, int reg, int crm,
 226                 uint32_t value)
 227 {
 228     target_phys_addr_t offset;
 229
 230     if (pxa2xx_cp_reg_map[reg] == -1) {
 231         printf("%s: Bad register 0x%x\n", __FUNCTION__, reg);
 232         return;
 233     }
 234
 235     offset = pxa2xx_cp_reg_map[reg];
 236     pxa2xx_pic_mem_write(opaque, offset, value, 4);
 237 }
 238
 239 static const MemoryRegionOps pxa2xx_pic_ops = {
 240     .read = pxa2xx_pic_mem_read,
 241     .write = pxa2xx_pic_mem_write,
 242     .endianness = DEVICE_NATIVE_ENDIAN,
 243 };
 244
 245 static int pxa2xx_pic_post_load(void *opaque, int version_id)
 246 {
 247     pxa2xx_pic_update(opaque);
 248     return 0;
 249 }
 250
 251 DeviceState *pxa2xx_pic_init(target_phys_addr_t base, ARMCPU *cpu)
 252 {
 253     CPUARMState *env = &cpu->env;
 254     DeviceState *dev = qdev_create(NULL, "pxa2xx_pic");
 255     PXA2xxPICState *s = FROM_SYSBUS(PXA2xxPICState, sysbus_from_qdev(dev));
 256
 257     s->cpu = cpu;
 258
 259     s->int_pending[0] = 0;
 260     s->int_pending[1] = 0;
 261     s->int_enabled[0] = 0;
 262     s->int_enabled[1] = 0;
 263     s->is_fiq[0] = 0;
 264     s->is_fiq[1] = 0;
 265
 266     qdev_init_nofail(dev);
 267
 268     qdev_init_gpio_in(dev, pxa2xx_pic_set_irq, PXA2XX_PIC_SRCS);
 269
 270     /* Enable IC memory-mapped registers access.  */
 271     memory_region_init_io(&s->iomem, &pxa2xx_pic_ops, s,
 272                           "pxa2xx-pic", 0x00100000);
 273     sysbus_init_mmio(sysbus_from_qdev(dev), &s->iomem);
 274     sysbus_mmio_map(sysbus_from_qdev(dev), 0, base);
 275
 276     /* Enable IC coprocessor access.  */
 277     cpu_arm_set_cp_io(env, 6, pxa2xx_pic_cp_read, pxa2xx_pic_cp_write, s);
 278
 279     return dev;
 280 }
 281
 282 static VMStateDescription vmstate_pxa2xx_pic_regs = {
 283     .name = "pxa2xx_pic",
 284     .version_id = 0,
 285     .minimum_version_id = 0,
 286     .minimum_version_id_old = 0,
 287     .post_load = pxa2xx_pic_post_load,
 288     .fields = (VMStateField[]) {
 289         VMSTATE_UINT32_ARRAY(int_enabled, PXA2xxPICState, 2),
 290         VMSTATE_UINT32_ARRAY(int_pending, PXA2xxPICState, 2),
 291         VMSTATE_UINT32_ARRAY(is_fiq, PXA2xxPICState, 2),
 292         VMSTATE_UINT32(int_idle, PXA2xxPICState),
 293         VMSTATE_UINT32_ARRAY(priority, PXA2xxPICState, PXA2XX_PIC_SRCS),
 294         VMSTATE_END_OF_LIST(),
 295     },
 296 };
 297
 298 static int pxa2xx_pic_initfn(SysBusDevice *dev)
 299 {
 300     return 0;
 301 }
 302
 303 static void pxa2xx_pic_class_init(ObjectClass *klass, void *data)
 304 {
 305     DeviceClass *dc = DEVICE_CLASS(klass);
 306     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 307
 308     k->init = pxa2xx_pic_initfn;
 309     dc->desc = "PXA2xx PIC";
 310     dc->vmsd = &vmstate_pxa2xx_pic_regs;
 311 }
 312
 313 static TypeInfo pxa2xx_pic_info = {
 314     .name          = "pxa2xx_pic",
 315     .parent        = TYPE_SYS_BUS_DEVICE,
 316     .instance_size = sizeof(PXA2xxPICState),
 317     .class_init    = pxa2xx_pic_class_init,
 318 };
 319
 320 static void pxa2xx_pic_register_types(void)
 321 {
 322     type_register_static(&pxa2xx_pic_info);
 323 }
 324
 325 type_init(pxa2xx_pic_register_types)