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 };
89