Merge tag 'ide-pull-request' of https://gitlab.com/jsnow/qemu into staging
[qemu.git] / hw / ppc / pnv_pnor.c
1 /*
2 * QEMU PowerNV PNOR simple model
3 *
4 * Copyright (c) 2015-2019, IBM Corporation.
5 *
6 * This code is licensed under the GPL version 2 or later. See the
7 * COPYING file in the top-level directory.
8 */
9
10 #include "qemu/osdep.h"
11 #include "qapi/error.h"
12 #include "qemu/error-report.h"
13 #include "qemu/units.h"
14 #include "sysemu/block-backend.h"
15 #include "sysemu/blockdev.h"
16 #include "hw/loader.h"
17 #include "hw/ppc/pnv_pnor.h"
18 #include "hw/qdev-properties.h"
19 #include "hw/qdev-properties-system.h"
20
21 static uint64_t pnv_pnor_read(void *opaque, hwaddr addr, unsigned size)
22 {
23 PnvPnor *s = PNV_PNOR(opaque);
24 uint64_t ret = 0;
25 int i;
26
27 for (i = 0; i < size; i++) {
28 ret |= (uint64_t) s->storage[addr + i] << (8 * (size - i - 1));
29 }
30
31 return ret;
32 }
33
34 static void pnv_pnor_update(PnvPnor *s, int offset, int size)
35 {
36 int offset_end;
37 int ret;
38
39 if (s->blk) {
40 return;
41 }
42
43 offset_end = offset + size;
44 offset = QEMU_ALIGN_DOWN(offset, BDRV_SECTOR_SIZE);
45 offset_end = QEMU_ALIGN_UP(offset_end, BDRV_SECTOR_SIZE);
46
47 ret = blk_pwrite(s->blk, offset, s->storage + offset,
48 offset_end - offset, 0);
49 if (ret < 0) {
50 error_report("Could not update PNOR offset=0x%" PRIx32" : %s", offset,
51 strerror(-ret));
52 }
53 }
54
55 static void pnv_pnor_write(void *opaque, hwaddr addr, uint64_t data,
56 unsigned size)
57 {
58 PnvPnor *s = PNV_PNOR(opaque);
59 int i;
60
61 for (i = 0; i < size; i++) {
62 s->storage[addr + i] = (data >> (8 * (size - i - 1))) & 0xFF;
63 }
64 pnv_pnor_update(s, addr, size);
65 }
66
67 /*
68 * TODO: Check endianness: skiboot is BIG, Aspeed AHB is LITTLE, flash
69 * is BIG.
70 */
71 static const MemoryRegionOps pnv_pnor_ops = {
72 .read = pnv_pnor_read,
73 .write = pnv_pnor_write,
74 .endianness = DEVICE_BIG_ENDIAN,
75 .valid = {
76 .min_access_size = 1,
77 .max_access_size = 4,
78 },
79 };
80
81 static void pnv_pnor_realize(DeviceState *dev, Error **errp)
82 {
83 PnvPnor *s = PNV_PNOR(dev);
84 int ret;
85
86 if (s->blk) {
87 uint64_t perm = BLK_PERM_CONSISTENT_READ |
88 (blk_supports_write_perm(s->blk) ? BLK_PERM_WRITE : 0);
89 ret = blk_set_perm(s->blk, perm, BLK_PERM_ALL, errp);
90 if (ret < 0) {
91 return;
92 }
93
94 s->size = blk_getlength(s->blk);
95 if (s->size <= 0) {
96 error_setg(errp, "failed to get flash size");
97 return;
98 }
99
100 s->storage = blk_blockalign(s->blk, s->size);
101
102 if (blk_pread(s->blk, 0, s->storage, s->size) != s->size) {
103 error_setg(errp, "failed to read the initial flash content");
104 return;
105 }
106 } else {
107 s->storage = blk_blockalign(NULL, s->size);
108 memset(s->storage, 0xFF, s->size);
109 }
110
111 memory_region_init_io(&s->mmio, OBJECT(s), &pnv_pnor_ops, s,
112 TYPE_PNV_PNOR, s->size);
113 }
114
115 static Property pnv_pnor_properties[] = {
116 DEFINE_PROP_INT64("size", PnvPnor, size, 128 * MiB),
117 DEFINE_PROP_DRIVE("drive", PnvPnor, blk),
118 DEFINE_PROP_END_OF_LIST(),
119 };
120
121 static void pnv_pnor_class_init(ObjectClass *klass, void *data)
122 {
123 DeviceClass *dc = DEVICE_CLASS(klass);
124
125 dc->realize = pnv_pnor_realize;
126 device_class_set_props(dc, pnv_pnor_properties);
127 }
128
129 static const TypeInfo pnv_pnor_info = {
130 .name = TYPE_PNV_PNOR,
131 .parent = TYPE_SYS_BUS_DEVICE,
132 .instance_size = sizeof(PnvPnor),
133 .class_init = pnv_pnor_class_init,
134 };
135
136 static void pnv_pnor_register_types(void)
137 {
138 type_register_static(&pnv_pnor_info);
139 }
140
141 type_init(pnv_pnor_register_types)