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Cédric Le Goater35dde572019-10-21 15:12:11 +02001/*
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/log.h"
Cédric Le Goaterb1c8c522020-01-08 10:03:47 +010014#include "qemu/units.h"
Cédric Le Goater35dde572019-10-21 15:12:11 +020015#include "sysemu/block-backend.h"
16#include "sysemu/blockdev.h"
17#include "hw/loader.h"
18#include "hw/ppc/pnv_pnor.h"
19#include "hw/qdev-properties.h"
20
21static 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
34static void pnv_pnor_update(PnvPnor *s, int offset, int size)
35{
36 int offset_end;
Cédric Le Goater3a688292020-01-07 18:18:08 +010037 int ret;
Cédric Le Goater35dde572019-10-21 15:12:11 +020038
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
Cédric Le Goater3a688292020-01-07 18:18:08 +010047 ret = blk_pwrite(s->blk, offset, s->storage + offset,
48 offset_end - offset, 0);
49 if (ret < 0) {
Cédric Le Goater3cf4aac2020-01-08 10:03:48 +010050 error_report("Could not update PNOR offset=0x%" PRIx32" : %s", offset,
51 strerror(-ret));
Cédric Le Goater3a688292020-01-07 18:18:08 +010052 }
Cédric Le Goater35dde572019-10-21 15:12:11 +020053}
54
55static 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 */
71static 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
81static 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_is_read_only(s->blk) ? 0 : BLK_PERM_WRITE);
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
115static Property pnv_pnor_properties[] = {
Cédric Le Goaterb1c8c522020-01-08 10:03:47 +0100116 DEFINE_PROP_INT64("size", PnvPnor, size, 128 * MiB),
Cédric Le Goater35dde572019-10-21 15:12:11 +0200117 DEFINE_PROP_DRIVE("drive", PnvPnor, blk),
118 DEFINE_PROP_END_OF_LIST(),
119};
120
121static void pnv_pnor_class_init(ObjectClass *klass, void *data)
122{
123 DeviceClass *dc = DEVICE_CLASS(klass);
124
125 dc->realize = pnv_pnor_realize;
Marc-André Lureau4f67d302020-01-10 19:30:32 +0400126 device_class_set_props(dc, pnv_pnor_properties);
Cédric Le Goater35dde572019-10-21 15:12:11 +0200127}
128
129static 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
136static void pnv_pnor_register_types(void)
137{
138 type_register_static(&pnv_pnor_info);
139}
140
141type_init(pnv_pnor_register_types)