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 licenced under the GPL.
   9  */
  10
  11 #include "hw.h"
  12 #include "pxa.h"
  13
  14 #define ICIP    0x00    /* Interrupt Controller IRQ Pending register */
  15 #define ICMR    0x04    /* Interrupt Controller Mask register */
  16 #define ICLR    0x08    /* Interrupt Controller Level register */
  17 #define ICFP    0x0c    /* Interrupt Controller FIQ Pending register */
  18 #define ICPR    0x10    /* Interrupt Controller Pending register */
  19 #define ICCR    0x14    /* Interrupt Controller Control register */
  20 #define ICHP    0x18    /* Interrupt Controller Highest Priority register */
  21 #define IPR0    0x1c    /* Interrupt Controller Priority register 0 */
  22 #define IPR31   0x98    /* Interrupt Controller Priority register 31 */
  23 #define ICIP2   0x9c    /* Interrupt Controller IRQ Pending register 2 */
  24 #define ICMR2   0xa0    /* Interrupt Controller Mask register 2 */
  25 #define ICLR2   0xa4    /* Interrupt Controller Level register 2 */
  26 #define ICFP2   0xa8    /* Interrupt Controller FIQ Pending register 2 */
  27 #define ICPR2   0xac    /* Interrupt Controller Pending register 2 */
  28 #define IPR32   0xb0    /* Interrupt Controller Priority register 32 */
  29 #define IPR39   0xcc    /* Interrupt Controller Priority register 39 */
  30
  31 #define PXA2XX_PIC_SRCS 40
  32
  33 struct pxa2xx_pic_state_s {
  34     CPUState *cpu_env;
  35     uint32_t int_enabled[2];
  36     uint32_t int_pending[2];
  37     uint32_t is_fiq[2];
  38     uint32_t int_idle;
  39     uint32_t priority[PXA2XX_PIC_SRCS];
  40 };
  41
  42 static void pxa2xx_pic_update(void *opaque)
  43 {
  44     uint32_t mask[2];
  45     struct pxa2xx_pic_state_s *s = (struct pxa2xx_pic_state_s *) opaque;
  46
  47     if (s->cpu_env->halted) {
  48         mask[0] = s->int_pending[0] & (s->int_enabled[0] | s->int_idle);
  49         mask[1] = s->int_pending[1] & (s->int_enabled[1] | s->int_idle);
  50         if (mask[0] || mask[1])
  51             cpu_interrupt(s->cpu_env, CPU_INTERRUPT_EXITTB);
  52     }
  53
  54     mask[0] = s->int_pending[0] & s->int_enabled[0];
  55     mask[1] = s->int_pending[1] & s->int_enabled[1];
  56
  57     if ((mask[0] & s->is_fiq[0]) || (mask[1] & s->is_fiq[1]))
  58         cpu_interrupt(s->cpu_env, CPU_INTERRUPT_FIQ);
  59     else
  60         cpu_reset_interrupt(s->cpu_env, CPU_INTERRUPT_FIQ);
  61
  62     if ((mask[0] & ~s->is_fiq[0]) || (mask[1] & ~s->is_fiq[1]))
  63         cpu_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
  64     else
  65         cpu_reset_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
  66 }
  67
  68 /* Note: Here level means state of the signal on a pin, not
  69  * IRQ/FIQ distinction as in PXA Developer Manual.  */
  70 static void pxa2xx_pic_set_irq(void *opaque, int irq, int level)
  71 {
  72     struct pxa2xx_pic_state_s *s = (struct pxa2xx_pic_state_s *) opaque;
  73     int int_set = (irq >= 32);
  74     irq &= 31;
  75
  76     if (level)
  77         s->int_pending[int_set] |= 1 << irq;
  78     else
  79         s->int_pending[int_set] &= ~(1 << irq);
  80
  81     pxa2xx_pic_update(opaque);
  82 }
  83
  84 static inline uint32_t pxa2xx_pic_highest(struct pxa2xx_pic_state_s *s) {
  85     int i, int_set, irq;
  86     uint32_t bit, mask[2];
  87     uint32_t ichp = 0x003f003f; /* Both IDs invalid */
  88
  89     mask[0] = s->int_pending[0] & s->int_enabled[0];
  90     mask[1] = s->int_pending[1] & s->int_enabled[1];
  91
  92     for (i = PXA2XX_PIC_SRCS - 1; i >= 0; i --) {
  93         irq = s->priority[i] & 0x3f;
  94         if ((s->priority[i] & (1 << 31)) && irq < PXA2XX_PIC_SRCS) {
  95             /* Source peripheral ID is valid.  */
  96             bit = 1 << (irq & 31);
  97             int_set = (irq >= 32);
  98
  99             if (mask[int_set] & bit & s->is_fiq[int_set]) {
 100                 /* FIQ asserted */
 101                 ichp &= 0xffff0000;
 102                 ichp |= (1 << 15) | irq;
 103             }
 104
 105             if (mask[int_set] & bit & ~s->is_fiq[int_set]) {
 106                 /* IRQ asserted */
 107                 ichp &= 0x0000ffff;
 108                 ichp |= (1 << 31) | (irq << 16);
 109             }
 110         }
 111     }
 112
 113     return ichp;
 114 }
 115
 116 static uint32_t pxa2xx_pic_mem_read(void *opaque, target_phys_addr_t offset)
 117 {
 118     struct pxa2xx_pic_state_s *s = (struct pxa2xx_pic_state_s *) opaque;
 119
 120     switch (offset) {
 121     case ICIP:  /* IRQ Pending register */
 122         return s->int_pending[0] & ~s->is_fiq[0] & s->int_enabled[0];
 123     case ICIP2: /* IRQ Pending register 2 */
 124         return s->int_pending[1] & ~s->is_fiq[1] & s->int_enabled[1];
 125     case ICMR:  /* Mask register */
 126         return s->int_enabled[0];
 127     case ICMR2: /* Mask register 2 */
 128         return s->int_enabled[1];
 129     case ICLR:  /* Level register */
 130         return s->is_fiq[0];
 131     case ICLR2: /* Level register 2 */
 132         return s->is_fiq[1];
 133     case ICCR:  /* Idle mask */
 134         return (s->int_idle == 0);
 135     case ICFP:  /* FIQ Pending register */
 136         return s->int_pending[0] & s->is_fiq[0] & s->int_enabled[0];
 137     case ICFP2: /* FIQ Pending register 2 */
 138         return s->int_pending[1] & s->is_fiq[1] & s->int_enabled[1];
 139     case ICPR:  /* Pending register */
 140         return s->int_pending[0];
 141     case ICPR2: /* Pending register 2 */
 142         return s->int_pending[1];
 143     case IPR0  ... IPR31:
 144         return s->priority[0  + ((offset - IPR0 ) >> 2)];
 145     case IPR32 ... IPR39:
 146         return s->priority[32 + ((offset - IPR32) >> 2)];
 147     case ICHP:  /* Highest Priority register */
 148         return pxa2xx_pic_highest(s);
 149     default:
 150         printf("%s: Bad register offset " REG_FMT "\n", __FUNCTION__, offset);
 151         return 0;
 152     }
 153 }
 154
 155 static void pxa2xx_pic_mem_write(void *opaque, target_phys_addr_t offset,
 156                 uint32_t value)
 157 {
 158     struct pxa2xx_pic_state_s *s = (struct pxa2xx_pic_state_s *) opaque;
 159
 160     switch (offset) {
 161     case ICMR:  /* Mask register */
 162         s->int_enabled[0] = value;
 163         break;
 164     case ICMR2: /* Mask register 2 */
 165         s->int_enabled[1] = value;
 166         break;
 167     case ICLR:  /* Level register */
 168         s->is_fiq[0] = value;
 169         break;
 170     case ICLR2: /* Level register 2 */
 171         s->is_fiq[1] = value;
 172         break;
 173     case ICCR:  /* Idle mask */
 174         s->int_idle = (value & 1) ? 0 : ~0;
 175         break;
 176     case IPR0  ... IPR31:
 177         s->priority[0  + ((offset - IPR0 ) >> 2)] = value & 0x8000003f;
 178         break;
 179     case IPR32 ... IPR39:
 180         s->priority[32 + ((offset - IPR32) >> 2)] = value & 0x8000003f;
 181         break;
 182     default:
 183         printf("%s: Bad register offset " REG_FMT "\n", __FUNCTION__, offset);
 184         return;
 185     }
 186     pxa2xx_pic_update(opaque);
 187 }
 188
 189 /* Interrupt Controller Coprocessor Space Register Mapping */
 190 static const int pxa2xx_cp_reg_map[0x10] = {
 191     [0x0 ... 0xf] = -1,
 192     [0x0] = ICIP,
 193     [0x1] = ICMR,
 194     [0x2] = ICLR,
 195     [0x3] = ICFP,
 196     [0x4] = ICPR,
 197     [0x5] = ICHP,
 198     [0x6] = ICIP2,
 199     [0x7] = ICMR2,
 200     [0x8] = ICLR2,
 201     [0x9] = ICFP2,
 202     [0xa] = ICPR2,
 203 };
 204
 205 static uint32_t pxa2xx_pic_cp_read(void *opaque, int op2, int reg, int crm)
 206 {
 207     target_phys_addr_t offset;
 208
 209     if (pxa2xx_cp_reg_map[reg] == -1) {
 210         printf("%s: Bad register 0x%x\n", __FUNCTION__, reg);
 211         return 0;
 212     }
 213
 214     offset = pxa2xx_cp_reg_map[reg];
 215     return pxa2xx_pic_mem_read(opaque, offset);
 216 }
 217
 218 static void pxa2xx_pic_cp_write(void *opaque, int op2, int reg, int crm,
 219                 uint32_t value)
 220 {
 221     target_phys_addr_t offset;
 222
 223     if (pxa2xx_cp_reg_map[reg] == -1) {
 224         printf("%s: Bad register 0x%x\n", __FUNCTION__, reg);
 225         return;
 226     }
 227
 228     offset = pxa2xx_cp_reg_map[reg];
 229     pxa2xx_pic_mem_write(opaque, offset, value);
 230 }
 231
 232 static CPUReadMemoryFunc *pxa2xx_pic_readfn[] = {
 233     pxa2xx_pic_mem_read,
 234     pxa2xx_pic_mem_read,
 235     pxa2xx_pic_mem_read,
 236 };
 237
 238 static CPUWriteMemoryFunc *pxa2xx_pic_writefn[] = {
 239     pxa2xx_pic_mem_write,
 240     pxa2xx_pic_mem_write,
 241     pxa2xx_pic_mem_write,
 242 };
 243
 244 static void pxa2xx_pic_save(QEMUFile *f, void *opaque)
 245 {
 246     struct pxa2xx_pic_state_s *s = (struct pxa2xx_pic_state_s *) opaque;
 247     int i;
 248
 249     for (i = 0; i < 2; i ++)
 250         qemu_put_be32s(f, &s->int_enabled[i]);
 251     for (i = 0; i < 2; i ++)
 252         qemu_put_be32s(f, &s->int_pending[i]);
 253     for (i = 0; i < 2; i ++)
 254         qemu_put_be32s(f, &s->is_fiq[i]);
 255     qemu_put_be32s(f, &s->int_idle);
 256     for (i = 0; i < PXA2XX_PIC_SRCS; i ++)
 257         qemu_put_be32s(f, &s->priority[i]);
 258 }
 259
 260 static int pxa2xx_pic_load(QEMUFile *f, void *opaque, int version_id)
 261 {
 262     struct pxa2xx_pic_state_s *s = (struct pxa2xx_pic_state_s *) opaque;
 263     int i;
 264
 265     for (i = 0; i < 2; i ++)
 266         qemu_get_be32s(f, &s->int_enabled[i]);
 267     for (i = 0; i < 2; i ++)
 268         qemu_get_be32s(f, &s->int_pending[i]);
 269     for (i = 0; i < 2; i ++)
 270         qemu_get_be32s(f, &s->is_fiq[i]);
 271     qemu_get_be32s(f, &s->int_idle);
 272     for (i = 0; i < PXA2XX_PIC_SRCS; i ++)
 273         qemu_get_be32s(f, &s->priority[i]);
 274
 275     pxa2xx_pic_update(opaque);
 276     return 0;
 277 }
 278
 279 qemu_irq *pxa2xx_pic_init(target_phys_addr_t base, CPUState *env)
 280 {
 281     struct pxa2xx_pic_state_s *s;
 282     int iomemtype;
 283     qemu_irq *qi;
 284
 285     s = (struct pxa2xx_pic_state_s *)
 286             qemu_mallocz(sizeof(struct pxa2xx_pic_state_s));
 287     if (!s)
 288         return NULL;
 289
 290     s->cpu_env = env;
 291
 292     s->int_pending[0] = 0;
 293     s->int_pending[1] = 0;
 294     s->int_enabled[0] = 0;
 295     s->int_enabled[1] = 0;
 296     s->is_fiq[0] = 0;
 297     s->is_fiq[1] = 0;
 298
 299     qi = qemu_allocate_irqs(pxa2xx_pic_set_irq, s, PXA2XX_PIC_SRCS);
 300
 301     /* Enable IC memory-mapped registers access.  */
 302     iomemtype = cpu_register_io_memory(0, pxa2xx_pic_readfn,
 303                     pxa2xx_pic_writefn, s);
 304     cpu_register_physical_memory(base, 0x00100000, iomemtype);
 305
 306     /* Enable IC coprocessor access.  */
 307     cpu_arm_set_cp_io(env, 6, pxa2xx_pic_cp_read, pxa2xx_pic_cp_write, s);
 308
 309     register_savevm("pxa2xx_pic", 0, 0, pxa2xx_pic_save, pxa2xx_pic_load, s);
 310
 311     return qi;
 312 }