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     uint32_t regs[SBI_NREGS];
  43     uint32_t intreg_pending[MAX_CPUS];
  44     qemu_irq cpu_irqs[MAX_CPUS];
  45     uint32_t pil_out[MAX_CPUS];
  46 } SBIState;
  47
  48 #define SBI_SIZE (SBI_NREGS * 4)
  49
  50 static void sbi_set_irq(void *opaque, int irq, int level)
  51 {
  52 }
  53
  54 static uint32_t sbi_mem_readl(void *opaque, target_phys_addr_t addr)
  55 {
  56     SBIState *s = opaque;
  57     uint32_t saddr, ret;
  58
  59     saddr = addr >> 2;
  60     switch (saddr) {
  61     default:
  62         ret = s->regs[saddr];
  63         break;
  64     }
  65     DPRINTF("read system reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);
  66
  67     return ret;
  68 }
  69
  70 static void sbi_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
  71 {
  72     SBIState *s = opaque;
  73     uint32_t saddr;
  74
  75     saddr = addr >> 2;
  76     DPRINTF("write system reg 0x" TARGET_FMT_plx " = %x\n", addr, val);
  77     switch (saddr) {
  78     default:
  79         s->regs[saddr] = val;
  80         break;
  81     }
  82 }
  83
  84 static CPUReadMemoryFunc * const sbi_mem_read[3] = {
  85     NULL,
  86     NULL,
  87     sbi_mem_readl,
  88 };
  89
  90 static CPUWriteMemoryFunc * const sbi_mem_write[3] = {
  91     NULL,
  92     NULL,
  93     sbi_mem_writel,
  94 };
  95
  96 static const VMStateDescription vmstate_sbi = {
  97     .name ="sbi",
  98     .version_id = 1,
  99     .minimum_version_id = 1,
 100     .minimum_version_id_old = 1,
 101     .fields      = (VMStateField []) {
 102         VMSTATE_UINT32_ARRAY(intreg_pending, SBIState, MAX_CPUS),
 103         VMSTATE_END_OF_LIST()
 104     }
 105 };
 106
 107 static void sbi_reset(DeviceState *d)
 108 {
 109     SBIState *s = container_of(d, SBIState, busdev.qdev);
 110     unsigned int i;
 111
 112     for (i = 0; i < MAX_CPUS; i++) {
 113         s->intreg_pending[i] = 0;
 114     }
 115 }
 116
 117 static int sbi_init1(SysBusDevice *dev)
 118 {
 119     SBIState *s = FROM_SYSBUS(SBIState, dev);
 120     int sbi_io_memory;
 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     sbi_io_memory = cpu_register_io_memory(sbi_mem_read, sbi_mem_write, s);
 129     sysbus_init_mmio(dev, SBI_SIZE, sbi_io_memory);
 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)