hw/hppa/pci.c

   1 /*
   2  * QEMU HP-PARISC PCI support functions.
   3  *
   4  */
   5
   6 #include "qemu/osdep.h"
   7 #include "hppa_sys.h"
   8 #include "qemu/log.h"
   9 #include "trace.h"
  10
  11
  12 /* Fallback for unassigned PCI I/O operations.  Avoids MCHK.  */
  13
  14 static uint64_t ignore_read(void *opaque, hwaddr addr, unsigned size)
  15 {
  16     return 0;
  17 }
  18
  19 static void ignore_write(void *opaque, hwaddr addr, uint64_t v, unsigned size)
  20 {
  21 }
  22
  23 const MemoryRegionOps hppa_pci_ignore_ops = {
  24     .read = ignore_read,
  25     .write = ignore_write,
  26     .endianness = DEVICE_BIG_ENDIAN,
  27     .valid = {
  28         .min_access_size = 1,
  29         .max_access_size = 8,
  30     },
  31     .impl = {
  32         .min_access_size = 1,
  33         .max_access_size = 8,
  34     },
  35 };
  36
  37
  38 /* PCI config space reads/writes, to byte-word addressable memory.  */
  39 static uint64_t bw_conf1_read(void *opaque, hwaddr addr,
  40                               unsigned size)
  41 {
  42     PCIBus *b = opaque;
  43     return pci_data_read(b, addr, size);
  44 }
  45
  46 static void bw_conf1_write(void *opaque, hwaddr addr,
  47                            uint64_t val, unsigned size)
  48 {
  49     PCIBus *b = opaque;
  50     pci_data_write(b, addr, val, size);
  51 }
  52
  53 const MemoryRegionOps hppa_pci_conf1_ops = {
  54     .read = bw_conf1_read,
  55     .write = bw_conf1_write,
  56     .endianness = DEVICE_BIG_ENDIAN,
  57     .impl = {
  58         .min_access_size = 1,
  59         .max_access_size = 4,
  60     },
  61 };
  62
  63 /* PCI/EISA Interrupt Acknowledge Cycle.  */
  64
  65 static uint64_t iack_read(void *opaque, hwaddr addr, unsigned size)
  66 {
  67     return pic_read_irq(isa_pic);
  68 }
  69
  70 static void special_write(void *opaque, hwaddr addr,
  71                           uint64_t val, unsigned size)
  72 {
  73     trace_hppa_pci_iack_write();
  74 }
  75
  76 const MemoryRegionOps hppa_pci_iack_ops = {
  77     .read = iack_read,
  78     .write = special_write,
  79     .endianness = DEVICE_BIG_ENDIAN,
  80     .valid = {
  81         .min_access_size = 4,
  82         .max_access_size = 4,
  83     },
  84     .impl = {
  85         .min_access_size = 4,
  86         .max_access_size = 4,
  87     },
  88 };