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     n = ((addr & 0xfff) - 0x10) >> 4;
  72     PIC_DPRINTF("writel: " TARGET_FMT_plx " %u: %08x\n", addr, n, value);
  73     if (n >= 2)
  74         return;
  75     pic = &s->pics[n];
  76     switch(addr & 0xf) {
  77     case 0x04:
  78         pic->mask = value;
  79         heathrow_pic_update(s);
  80         break;
  81     case 0x08:
  82         /* do not reset level triggered IRQs */
  83         value &= ~pic->level_triggered;
  84         pic->events &= ~value;
  85         heathrow_pic_update(s);
  86         break;
  87     default:
  88         break;
  89     }
  90 }
  91
  92 static uint32_t pic_readl (void *opaque, target_phys_addr_t addr)
  93 {
  94     HeathrowPICS *s = opaque;
  95     HeathrowPIC *pic;
  96     unsigned int n;
  97     uint32_t value;
  98
  99     n = ((addr & 0xfff) - 0x10) >> 4;
 100     if (n >= 2) {
 101         value = 0;
 102     } else {
 103         pic = &s->pics[n];
 104         switch(addr & 0xf) {
 105         case 0x0:
 106             value = pic->events;
 107             break;
 108         case 0x4:
 109             value = pic->mask;
 110             break;
 111         case 0xc:
 112             value = pic->levels;
 113             break;
 114         default:
 115             value = 0;
 116             break;
 117         }
 118     }
 119     PIC_DPRINTF("readl: " TARGET_FMT_plx " %u: %08x\n", addr, n, value);
 120     return value;
 121 }
 122
 123 static CPUWriteMemoryFunc * const pic_write[] = {
 124     &pic_writel,
 125     &pic_writel,
 126     &pic_writel,
 127 };
 128
 129 static CPUReadMemoryFunc * const pic_read[] = {
 130     &pic_readl,
 131     &pic_readl,
 132     &pic_readl,
 133 };
 134
 135
 136 static void heathrow_pic_set_irq(void *opaque, int num, int level)
 137 {
 138     HeathrowPICS *s = opaque;
 139     HeathrowPIC *pic;
 140     unsigned int irq_bit;
 141
 142 #if defined(DEBUG)
 143     {
 144         static int last_level[64];
 145         if (last_level[num] != level) {
 146             PIC_DPRINTF("set_irq: num=0x%02x level=%d\n", num, level);
 147             last_level[num] = level;
 148         }
 149     }
 150 #endif
 151     pic = &s->pics[1 - (num >> 5)];
 152     irq_bit = 1 << (num & 0x1f);
 153     if (level) {
 154         pic->events |= irq_bit & ~pic->level_triggered;
 155         pic->levels |= irq_bit;
 156     } else {
 157         pic->levels &= ~irq_bit;
 158     }
 159     heathrow_pic_update(s);
 160 }
 161
 162 static const VMStateDescription vmstate_heathrow_pic_one = {
 163     .name = "heathrow_pic_one",
 164     .version_id = 0,
 165     .minimum_version_id = 0,
 166     .minimum_version_id_old = 0,
 167     .fields      = (VMStateField[]) {
 168         VMSTATE_UINT32(events, HeathrowPIC),
 169         VMSTATE_UINT32(mask, HeathrowPIC),
 170         VMSTATE_UINT32(levels, HeathrowPIC),
 171         VMSTATE_UINT32(level_triggered, HeathrowPIC),
 172         VMSTATE_END_OF_LIST()
 173     }
 174 };
 175
 176 static const VMStateDescription vmstate_heathrow_pic = {
 177     .name = "heathrow_pic",
 178     .version_id = 1,
 179     .minimum_version_id = 1,
 180     .minimum_version_id_old = 1,
 181     .fields      = (VMStateField[]) {
 182         VMSTATE_STRUCT_ARRAY(pics, HeathrowPICS, 2, 1,
 183                              vmstate_heathrow_pic_one, HeathrowPIC),
 184         VMSTATE_END_OF_LIST()
 185     }
 186 };
 187
 188 static void heathrow_pic_reset_one(HeathrowPIC *s)
 189 {
 190     memset(s, '\0', sizeof(HeathrowPIC));
 191 }
 192
 193 static void heathrow_pic_reset(void *opaque)
 194 {
 195     HeathrowPICS *s = opaque;
 196
 197     heathrow_pic_reset_one(&s->pics[0]);
 198     heathrow_pic_reset_one(&s->pics[1]);
 199
 200     s->pics[0].level_triggered = 0;
 201     s->pics[1].level_triggered = 0x1ff00000;
 202 }
 203
 204 qemu_irq *heathrow_pic_init(int *pmem_index,
 205                             int nb_cpus, qemu_irq **irqs)
 206 {
 207     HeathrowPICS *s;
 208
 209     s = qemu_mallocz(sizeof(HeathrowPICS));
 210     /* only 1 CPU */
 211     s->irqs = irqs[0];
 212     *pmem_index = cpu_register_io_memory(pic_read, pic_write, s,
 213                                          DEVICE_LITTLE_ENDIAN);
 214
 215     vmstate_register(NULL, -1, &vmstate_heathrow_pic, s);
 216     qemu_register_reset(heathrow_pic_reset, s);
 217     return qemu_allocate_irqs(heathrow_pic_set_irq, s, 64);
 218 }