hw/heathrow_pic.c

   1 /*
   2  * Heathrow PIC support (OldWorld PowerMac)
   3  *
   4  * Copyright (c) 2005-2007 Fabrice Bellard
   5  * Copyright (c) 2007 Jocelyn Mayer
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #include "hw.h"
  26 #include "ppc_mac.h"
  27
  28 /* debug PIC */
  29 //#define DEBUG_PIC
  30
  31 #ifdef DEBUG_PIC
  32 #define PIC_DPRINTF(fmt, ...)                                   \
  33     do { printf("PIC: " fmt , ## __VA_ARGS__); } while (0)
  34 #else
  35 #define PIC_DPRINTF(fmt, ...)
  36 #endif
  37
  38 typedef struct HeathrowPIC {
  39     uint32_t events;
  40     uint32_t mask;
  41     uint32_t levels;
  42     uint32_t level_triggered;
  43 } HeathrowPIC;
  44
  45 typedef struct HeathrowPICS {
  46     HeathrowPIC pics[2];
  47     qemu_irq *irqs;
  48 } HeathrowPICS;
  49
  50 static inline int check_irq(HeathrowPIC *pic)
  51 {
  52     return (pic->events | (pic->levels & pic->level_triggered)) & pic->mask;
  53 }
  54
  55 /* update the CPU irq state */
  56 static void heathrow_pic_update(HeathrowPICS *s)
  57 {
  58     if (check_irq(&s->pics[0]) || check_irq(&s->pics[1])) {
  59         qemu_irq_raise(s->irqs[0]);
  60     } else {
  61         qemu_irq_lower(s->irqs[0]);
  62     }
  63 }
  64
  65 static void pic_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
  66 {
  67     HeathrowPICS *s = opaque;
  68     HeathrowPIC *pic;
  69     unsigned int n;
  70
  71     value = bswap32(value);
  72     n = ((addr & 0xfff) - 0x10) >> 4;
  73     PIC_DPRINTF("writel: " TARGET_FMT_plx " %u: %08x\n", addr, n, value);
  74     if (n >= 2)
  75         return;
  76     pic = &s->pics[n];
  77     switch(addr & 0xf) {
  78     case 0x04:
  79         pic->mask = value;
  80         heathrow_pic_update(s);
  81         break;
  82     case 0x08:
  83         /* do not reset level triggered IRQs */
  84         value &= ~pic->level_triggered;
  85         pic->events &= ~value;
  86         heathrow_pic_update(s);
  87         break;
  88     default:
  89         break;
  90     }
  91 }
  92
  93 static uint32_t pic_readl (void *opaque, target_phys_addr_t addr)
  94 {
  95     HeathrowPICS *s = opaque;
  96     HeathrowPIC *pic;
  97     unsigned int n;
  98     uint32_t value;
  99
 100     n = ((addr & 0xfff) - 0x10) >> 4;
 101     if (n >= 2) {
 102         value = 0;
 103     } else {
 104         pic = &s->pics[n];
 105         switch(addr & 0xf) {
 106         case 0x0:
 107             value = pic->events;
 108             break;
 109         case 0x4:
 110             value = pic->mask;
 111             break;
 112         case 0xc:
 113             value = pic->levels;
 114             break;
 115         default:
 116             value = 0;
 117             break;
 118         }
 119     }
 120     PIC_DPRINTF("readl: " TARGET_FMT_plx " %u: %08x\n", addr, n, value);
 121     value = bswap32(value);
 122     return value;
 123 }
 124
 125 static CPUWriteMemoryFunc * const pic_write[] = {
 126     &pic_writel,
 127     &pic_writel,
 128     &pic_writel,
 129 };
 130
 131 static CPUReadMemoryFunc * const pic_read[] = {
 132     &pic_readl,
 133     &pic_readl,
 134     &pic_readl,
 135 };
 136
 137
 138 static void heathrow_pic_set_irq(void *opaque, int num, int level)
 139 {
 140     HeathrowPICS *s = opaque;
 141     HeathrowPIC *pic;
 142     unsigned int irq_bit;
 143
 144 #if defined(DEBUG)
 145     {
 146         static int last_level[64];
 147         if (last_level[num] != level) {
 148             PIC_DPRINTF("set_irq: num=0x%02x level=%d\n", num, level);
 149             last_level[num] = level;
 150         }
 151     }
 152 #endif
 153     pic = &s->pics[1 - (num >> 5)];
 154     irq_bit = 1 << (num & 0x1f);
 155     if (level) {
 156         pic->events |= irq_bit & ~pic->level_triggered;
 157         pic->levels |= irq_bit;
 158     } else {
 159         pic->levels &= ~irq_bit;
 160     }
 161     heathrow_pic_update(s);
 162 }
 163
 164 static void heathrow_pic_save_one(QEMUFile *f, HeathrowPIC *s)
 165 {
 166     qemu_put_be32s(f, &s->events);
 167     qemu_put_be32s(f, &s->mask);
 168     qemu_put_be32s(f, &s->levels);
 169     qemu_put_be32s(f, &s->level_triggered);
 170 }
 171
 172 static void heathrow_pic_save(QEMUFile *f, void *opaque)
 173 {
 174     HeathrowPICS *s = (HeathrowPICS *)opaque;
 175
 176     heathrow_pic_save_one(f, &s->pics[0]);
 177     heathrow_pic_save_one(f, &s->pics[1]);
 178 }
 179
 180 static void heathrow_pic_load_one(QEMUFile *f, HeathrowPIC *s)
 181 {
 182     qemu_get_be32s(f, &s->events);
 183     qemu_get_be32s(f, &s->mask);
 184     qemu_get_be32s(f, &s->levels);
 185     qemu_get_be32s(f, &s->level_triggered);
 186 }
 187
 188 static int heathrow_pic_load(QEMUFile *f, void *opaque, int version_id)
 189 {
 190     HeathrowPICS *s = (HeathrowPICS *)opaque;
 191
 192     if (version_id != 1)
 193         return -EINVAL;
 194
 195     heathrow_pic_load_one(f, &s->pics[0]);
 196     heathrow_pic_load_one(f, &s->pics[1]);
 197
 198     return 0;
 199 }
 200
 201 static void heathrow_pic_reset_one(HeathrowPIC *s)
 202 {
 203     memset(s, '\0', sizeof(HeathrowPIC));
 204 }
 205
 206 static void heathrow_pic_reset(void *opaque)
 207 {
 208     HeathrowPICS *s = opaque;
 209
 210     heathrow_pic_reset_one(&s->pics[0]);
 211     heathrow_pic_reset_one(&s->pics[1]);
 212
 213     s->pics[0].level_triggered = 0;
 214     s->pics[1].level_triggered = 0x1ff00000;
 215 }
 216
 217 qemu_irq *heathrow_pic_init(int *pmem_index,
 218                             int nb_cpus, qemu_irq **irqs)
 219 {
 220     HeathrowPICS *s;
 221
 222     s = qemu_mallocz(sizeof(HeathrowPICS));
 223     /* only 1 CPU */
 224     s->irqs = irqs[0];
 225     *pmem_index = cpu_register_io_memory(pic_read, pic_write, s);
 226
 227     register_savevm("heathrow_pic", -1, 1, heathrow_pic_save,
 228                     heathrow_pic_load, s);
 229     qemu_register_reset(heathrow_pic_reset, s);
 230     return qemu_allocate_irqs(heathrow_pic_set_irq, s, 64);
 231 }