hw/alpha/pci.c

   1 /*
   2  * QEMU Alpha PCI support functions.
   3  *
   4  * Some of this isn't very Alpha specific at all.
   5  *
   6  * ??? Sparse memory access not implemented.
   7  */
   8
   9 #include "qemu/osdep.h"
  10 #include "alpha_sys.h"
  11 #include "qemu/log.h"
  12 #include "trace.h"
  13
  14
  15 /* Fallback for unassigned PCI I/O operations.  Avoids MCHK.  */
  16
  17 static uint64_t ignore_read(void *opaque, hwaddr addr, unsigned size)
  18 {
  19     return 0;
  20 }
  21
  22 static void ignore_write(void *opaque, hwaddr addr, uint64_t v, unsigned size)
  23 {
  24 }
  25
  26 const MemoryRegionOps alpha_pci_ignore_ops = {
  27     .read = ignore_read,
  28     .write = ignore_write,
  29     .endianness = DEVICE_LITTLE_ENDIAN,
  30     .valid = {
  31         .min_access_size = 1,
  32         .max_access_size = 8,
  33     },
  34     .impl = {
  35         .min_access_size = 1,
  36         .max_access_size = 8,
  37     },
  38 };
  39
  40
  41 /* PCI config space reads/writes, to byte-word addressable memory.  */
  42 static uint64_t bw_conf1_read(void *opaque, hwaddr addr,
  43                               unsigned size)
  44 {
  45     PCIBus *b = opaque;
  46     return pci_data_read(b, addr, size);
  47 }
  48
  49 static void bw_conf1_write(void *opaque, hwaddr addr,
  50                            uint64_t val, unsigned size)
  51 {
  52     PCIBus *b = opaque;
  53     pci_data_write(b, addr, val, size);
  54 }
  55
  56 const MemoryRegionOps alpha_pci_conf1_ops = {
  57     .read = bw_conf1_read,
  58     .write = bw_conf1_write,
  59     .endianness = DEVICE_LITTLE_ENDIAN,
  60     .impl = {
  61         .min_access_size = 1,
  62         .max_access_size = 4,
  63     },
  64 };
  65
  66 /* PCI/EISA Interrupt Acknowledge Cycle.  */
  67
  68 static uint64_t iack_read(void *opaque, hwaddr addr, unsigned size)
  69 {
  70     return pic_read_irq(isa_pic);
  71 }
  72
  73 static void special_write(void *opaque, hwaddr addr,
  74                           uint64_t val, unsigned size)
  75 {
  76     trace_alpha_pci_iack_write();
  77 }
  78
  79 const MemoryRegionOps alpha_pci_iack_ops = {
  80     .read = iack_read,
  81     .write = special_write,
  82     .endianness = DEVICE_LITTLE_ENDIAN,
  83     .valid = {
  84         .min_access_size = 4,
  85         .max_access_size = 4,
  86     },
  87     .impl = {
  88         .min_access_size = 4,
  89         .max_access_size = 4,
  90     },
  91 };