util/mmap-alloc: check parameter before using
[qemu/ar7.git] / hw / misc / milkymist-hpdmc.c
blobe6140eec6ba9ebb325567638e4aac60f0640ef68
1 /*
2 * QEMU model of the Milkymist High Performance Dynamic Memory Controller.
4 * Copyright (c) 2010 Michael Walle <michael@walle.cc>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
20 * Specification available at:
21 * http://milkymist.walle.cc/socdoc/hpdmc.pdf
24 #include "qemu/osdep.h"
25 #include "hw/hw.h"
26 #include "hw/sysbus.h"
27 #include "trace.h"
28 #include "qemu/error-report.h"
30 enum {
31 R_SYSTEM = 0,
32 R_BYPASS,
33 R_TIMING,
34 R_IODELAY,
35 R_MAX
38 enum {
39 IODELAY_DQSDELAY_RDY = (1<<5),
40 IODELAY_PLL1_LOCKED = (1<<6),
41 IODELAY_PLL2_LOCKED = (1<<7),
44 #define TYPE_MILKYMIST_HPDMC "milkymist-hpdmc"
45 #define MILKYMIST_HPDMC(obj) \
46 OBJECT_CHECK(MilkymistHpdmcState, (obj), TYPE_MILKYMIST_HPDMC)
48 struct MilkymistHpdmcState {
49 SysBusDevice parent_obj;
51 MemoryRegion regs_region;
53 uint32_t regs[R_MAX];
55 typedef struct MilkymistHpdmcState MilkymistHpdmcState;
57 static uint64_t hpdmc_read(void *opaque, hwaddr addr,
58 unsigned size)
60 MilkymistHpdmcState *s = opaque;
61 uint32_t r = 0;
63 addr >>= 2;
64 switch (addr) {
65 case R_SYSTEM:
66 case R_BYPASS:
67 case R_TIMING:
68 case R_IODELAY:
69 r = s->regs[addr];
70 break;
72 default:
73 error_report("milkymist_hpdmc: read access to unknown register 0x"
74 TARGET_FMT_plx, addr << 2);
75 break;
78 trace_milkymist_hpdmc_memory_read(addr << 2, r);
80 return r;
83 static void hpdmc_write(void *opaque, hwaddr addr, uint64_t value,
84 unsigned size)
86 MilkymistHpdmcState *s = opaque;
88 trace_milkymist_hpdmc_memory_write(addr, value);
90 addr >>= 2;
91 switch (addr) {
92 case R_SYSTEM:
93 case R_BYPASS:
94 case R_TIMING:
95 s->regs[addr] = value;
96 break;
97 case R_IODELAY:
98 /* ignore writes */
99 break;
101 default:
102 error_report("milkymist_hpdmc: write access to unknown register 0x"
103 TARGET_FMT_plx, addr << 2);
104 break;
108 static const MemoryRegionOps hpdmc_mmio_ops = {
109 .read = hpdmc_read,
110 .write = hpdmc_write,
111 .valid = {
112 .min_access_size = 4,
113 .max_access_size = 4,
115 .endianness = DEVICE_NATIVE_ENDIAN,
118 static void milkymist_hpdmc_reset(DeviceState *d)
120 MilkymistHpdmcState *s = MILKYMIST_HPDMC(d);
121 int i;
123 for (i = 0; i < R_MAX; i++) {
124 s->regs[i] = 0;
127 /* defaults */
128 s->regs[R_IODELAY] = IODELAY_DQSDELAY_RDY | IODELAY_PLL1_LOCKED
129 | IODELAY_PLL2_LOCKED;
132 static int milkymist_hpdmc_init(SysBusDevice *dev)
134 MilkymistHpdmcState *s = MILKYMIST_HPDMC(dev);
136 memory_region_init_io(&s->regs_region, OBJECT(dev), &hpdmc_mmio_ops, s,
137 "milkymist-hpdmc", R_MAX * 4);
138 sysbus_init_mmio(dev, &s->regs_region);
140 return 0;
143 static const VMStateDescription vmstate_milkymist_hpdmc = {
144 .name = "milkymist-hpdmc",
145 .version_id = 1,
146 .minimum_version_id = 1,
147 .fields = (VMStateField[]) {
148 VMSTATE_UINT32_ARRAY(regs, MilkymistHpdmcState, R_MAX),
149 VMSTATE_END_OF_LIST()
153 static void milkymist_hpdmc_class_init(ObjectClass *klass, void *data)
155 DeviceClass *dc = DEVICE_CLASS(klass);
156 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
158 k->init = milkymist_hpdmc_init;
159 dc->reset = milkymist_hpdmc_reset;
160 dc->vmsd = &vmstate_milkymist_hpdmc;
163 static const TypeInfo milkymist_hpdmc_info = {
164 .name = TYPE_MILKYMIST_HPDMC,
165 .parent = TYPE_SYS_BUS_DEVICE,
166 .instance_size = sizeof(MilkymistHpdmcState),
167 .class_init = milkymist_hpdmc_class_init,
170 static void milkymist_hpdmc_register_types(void)
172 type_register_static(&milkymist_hpdmc_info);
175 type_init(milkymist_hpdmc_register_types)