hw/sbi.c

   1 /*
   2  * QEMU Sparc SBI interrupt controller emulation
   3  *
   4  * Based on slavio_intctl, copyright (c) 2003-2005 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "sysbus.h"
  26
  27 //#define DEBUG_IRQ
  28
  29 #ifdef DEBUG_IRQ
  30 #define DPRINTF(fmt, ...)                                       \
  31     do { printf("IRQ: " fmt , ## __VA_ARGS__); } while (0)
  32 #else
  33 #define DPRINTF(fmt, ...)
  34 #endif
  35
  36 #define MAX_CPUS 16
  37
  38 #define SBI_NREGS 16
  39
  40 typedef struct SBIState {
  41     SysBusDevice busdev;
  42     MemoryRegion iomem;
  43     uint32_t regs[SBI_NREGS];
  44     uint32_t intreg_pending[MAX_CPUS];
  45     qemu_irq cpu_irqs[MAX_CPUS];
  46     uint32_t pil_out[MAX_CPUS];
  47 } SBIState;
  48
  49 #define SBI_SIZE (SBI_NREGS * 4)
  50
  51 static void sbi_set_irq(void *opaque, int irq, int level)
  52 {
  53 }
  54
  55 static uint64_t sbi_mem_read(void *opaque, target_phys_addr_t addr,
  56                              unsigned size)
  57 {
  58     SBIState *s = opaque;
  59     uint32_t saddr, ret;
  60
  61     saddr = addr >> 2;
  62     switch (saddr) {
  63     default:
  64         ret = s->regs[saddr];
  65         break;
  66     }
  67     DPRINTF("read system reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);
  68
  69     return ret;
  70 }
  71
  72 static void sbi_mem_write(void *opaque, target_phys_addr_t addr,
  73                           uint64_t val, unsigned dize)
  74 {
  75     SBIState *s = opaque;
  76     uint32_t saddr;
  77
  78     saddr = addr >> 2;
  79     DPRINTF("write system reg 0x" TARGET_FMT_plx " = %x\n", addr, (int)val);
  80     switch (saddr) {
  81     default:
  82         s->regs[saddr] = val;
  83         break;
  84     }
  85 }
  86
  87 static const MemoryRegionOps sbi_mem_ops = {
  88     .read = sbi_mem_read,
  89     .write = sbi_mem_write,
  90     .endianness = DEVICE_NATIVE_ENDIAN,
  91     .valid = {
  92         .min_access_size = 4,
  93         .max_access_size = 4,
  94     },
  95 };
  96
  97 static const VMStateDescription vmstate_sbi = {
  98     .name ="sbi",
  99     .version_id = 1,
 100     .minimum_version_id = 1,
 101     .minimum_version_id_old = 1,
 102     .fields      = (VMStateField []) {
 103         VMSTATE_UINT32_ARRAY(intreg_pending, SBIState, MAX_CPUS),
 104         VMSTATE_END_OF_LIST()
 105     }
 106 };
 107
 108 static void sbi_reset(DeviceState *d)
 109 {
 110     SBIState *s = container_of(d, SBIState, busdev.qdev);
 111     unsigned int i;
 112
 113     for (i = 0; i < MAX_CPUS; i++) {
 114         s->intreg_pending[i] = 0;
 115     }
 116 }
 117
 118 static int sbi_init1(SysBusDevice *dev)
 119 {
 120     SBIState *s = FROM_SYSBUS(SBIState, dev);
 121     unsigned int i;
 122
 123     qdev_init_gpio_in(&dev->qdev, sbi_set_irq, 32 + MAX_CPUS);
 124     for (i = 0; i < MAX_CPUS; i++) {
 125         sysbus_init_irq(dev, &s->cpu_irqs[i]);
 126     }
 127
 128     memory_region_init_io(&s->iomem, &sbi_mem_ops, s, "sbi", SBI_SIZE);
 129     sysbus_init_mmio(dev, &s->iomem);
 130
 131     return 0;
 132 }
 133
 134 static SysBusDeviceInfo sbi_info = {
 135     .init = sbi_init1,
 136     .qdev.name  = "sbi",
 137     .qdev.size  = sizeof(SBIState),
 138     .qdev.vmsd  = &vmstate_sbi,
 139     .qdev.reset = sbi_reset,
 140 };
 141
 142 static void sbi_register_devices(void)
 143 {
 144     sysbus_register_withprop(&sbi_info);
 145 }
 146
 147 device_init(sbi_register_devices)