xref: /openbmc/qemu/hw/alpha/pci.c (revision 674b0a57)
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 "hw/pci/pci_host.h"
11 #include "alpha_sys.h"
12 #include "qemu/log.h"
13 #include "trace.h"
14 
15 
16 /* Fallback for unassigned PCI I/O operations.  Avoids MCHK.  */
17 
ignore_read(void * opaque,hwaddr addr,unsigned size)18 static uint64_t ignore_read(void *opaque, hwaddr addr, unsigned size)
19 {
20     return 0;
21 }
22 
ignore_write(void * opaque,hwaddr addr,uint64_t v,unsigned size)23 static void ignore_write(void *opaque, hwaddr addr, uint64_t v, unsigned size)
24 {
25 }
26 
27 const MemoryRegionOps alpha_pci_ignore_ops = {
28     .read = ignore_read,
29     .write = ignore_write,
30     .endianness = DEVICE_LITTLE_ENDIAN,
31     .valid = {
32         .min_access_size = 1,
33         .max_access_size = 8,
34     },
35     .impl = {
36         .min_access_size = 1,
37         .max_access_size = 8,
38     },
39 };
40 
41 
42 /* PCI config space reads/writes, to byte-word addressable memory.  */
bw_conf1_read(void * opaque,hwaddr addr,unsigned size)43 static uint64_t bw_conf1_read(void *opaque, hwaddr addr,
44                               unsigned size)
45 {
46     PCIBus *b = opaque;
47     return pci_data_read(b, addr, size);
48 }
49 
bw_conf1_write(void * opaque,hwaddr addr,uint64_t val,unsigned size)50 static void bw_conf1_write(void *opaque, hwaddr addr,
51                            uint64_t val, unsigned size)
52 {
53     PCIBus *b = opaque;
54     pci_data_write(b, addr, val, size);
55 }
56 
57 const MemoryRegionOps alpha_pci_conf1_ops = {
58     .read = bw_conf1_read,
59     .write = bw_conf1_write,
60     .endianness = DEVICE_LITTLE_ENDIAN,
61     .impl = {
62         .min_access_size = 1,
63         .max_access_size = 4,
64     },
65 };
66 
67 /* PCI/EISA Interrupt Acknowledge Cycle.  */
68 
iack_read(void * opaque,hwaddr addr,unsigned size)69 static uint64_t iack_read(void *opaque, hwaddr addr, unsigned size)
70 {
71     return pic_read_irq(isa_pic);
72 }
73 
special_write(void * opaque,hwaddr addr,uint64_t val,unsigned size)74 static void special_write(void *opaque, hwaddr addr,
75                           uint64_t val, unsigned size)
76 {
77     trace_alpha_pci_iack_write();
78 }
79 
80 const MemoryRegionOps alpha_pci_iack_ops = {
81     .read = iack_read,
82     .write = special_write,
83     .endianness = DEVICE_LITTLE_ENDIAN,
84     .valid = {
85         .min_access_size = 4,
86         .max_access_size = 4,
87     },
88     .impl = {
89         .min_access_size = 4,
90         .max_access_size = 4,
91     },
92 };
93