linux-user: stack_base is now mandatory on all targets
[qemu.git] / hw / milkymist-hpdmc.c
1 /*
2 * QEMU model of the Milkymist High Performance Dynamic Memory Controller.
3 *
4 * Copyright (c) 2010 Michael Walle <michael@walle.cc>
5 *
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.
10 *
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.
15 *
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/>.
18 *
19 *
20 * Specification available at:
21 * http://www.milkymist.org/socdoc/hpdmc.pdf
22 */
23
24 #include "hw.h"
25 #include "sysbus.h"
26 #include "trace.h"
27 #include "qemu-error.h"
28
29 enum {
30 R_SYSTEM = 0,
31 R_BYPASS,
32 R_TIMING,
33 R_IODELAY,
34 R_MAX
35 };
36
37 enum {
38 IODELAY_DQSDELAY_RDY = (1<<5),
39 IODELAY_PLL1_LOCKED = (1<<6),
40 IODELAY_PLL2_LOCKED = (1<<7),
41 };
42
43 struct MilkymistHpdmcState {
44 SysBusDevice busdev;
45 MemoryRegion regs_region;
46
47 uint32_t regs[R_MAX];
48 };
49 typedef struct MilkymistHpdmcState MilkymistHpdmcState;
50
51 static uint64_t hpdmc_read(void *opaque, target_phys_addr_t addr,
52 unsigned size)
53 {
54 MilkymistHpdmcState *s = opaque;
55 uint32_t r = 0;
56
57 addr >>= 2;
58 switch (addr) {
59 case R_SYSTEM:
60 case R_BYPASS:
61 case R_TIMING:
62 case R_IODELAY:
63 r = s->regs[addr];
64 break;
65
66 default:
67 error_report("milkymist_hpdmc: read access to unknown register 0x"
68 TARGET_FMT_plx, addr << 2);
69 break;
70 }
71
72 trace_milkymist_hpdmc_memory_read(addr << 2, r);
73
74 return r;
75 }
76
77 static void hpdmc_write(void *opaque, target_phys_addr_t addr, uint64_t value,
78 unsigned size)
79 {
80 MilkymistHpdmcState *s = opaque;
81
82 trace_milkymist_hpdmc_memory_write(addr, value);
83
84 addr >>= 2;
85 switch (addr) {
86 case R_SYSTEM:
87 case R_BYPASS:
88 case R_TIMING:
89 s->regs[addr] = value;
90 break;
91 case R_IODELAY:
92 /* ignore writes */
93 break;
94
95 default:
96 error_report("milkymist_hpdmc: write access to unknown register 0x"
97 TARGET_FMT_plx, addr << 2);
98 break;
99 }
100 }
101
102 static const MemoryRegionOps hpdmc_mmio_ops = {
103 .read = hpdmc_read,
104 .write = hpdmc_write,
105 .valid = {
106 .min_access_size = 4,
107 .max_access_size = 4,
108 },
109 .endianness = DEVICE_NATIVE_ENDIAN,
110 };
111
112 static void milkymist_hpdmc_reset(DeviceState *d)
113 {
114 MilkymistHpdmcState *s = container_of(d, MilkymistHpdmcState, busdev.qdev);
115 int i;
116
117 for (i = 0; i < R_MAX; i++) {
118 s->regs[i] = 0;
119 }
120
121 /* defaults */
122 s->regs[R_IODELAY] = IODELAY_DQSDELAY_RDY | IODELAY_PLL1_LOCKED
123 | IODELAY_PLL2_LOCKED;
124 }
125
126 static int milkymist_hpdmc_init(SysBusDevice *dev)
127 {
128 MilkymistHpdmcState *s = FROM_SYSBUS(typeof(*s), dev);
129
130 memory_region_init_io(&s->regs_region, &hpdmc_mmio_ops, s,
131 "milkymist-hpdmc", R_MAX * 4);
132 sysbus_init_mmio(dev, &s->regs_region);
133
134 return 0;
135 }
136
137 static const VMStateDescription vmstate_milkymist_hpdmc = {
138 .name = "milkymist-hpdmc",
139 .version_id = 1,
140 .minimum_version_id = 1,
141 .minimum_version_id_old = 1,
142 .fields = (VMStateField[]) {
143 VMSTATE_UINT32_ARRAY(regs, MilkymistHpdmcState, R_MAX),
144 VMSTATE_END_OF_LIST()
145 }
146 };
147
148 static void milkymist_hpdmc_class_init(ObjectClass *klass, void *data)
149 {
150 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
151
152 k->init = milkymist_hpdmc_init;
153 }
154
155 static DeviceInfo milkymist_hpdmc_info = {
156 .name = "milkymist-hpdmc",
157 .size = sizeof(MilkymistHpdmcState),
158 .vmsd = &vmstate_milkymist_hpdmc,
159 .reset = milkymist_hpdmc_reset,
160 .class_init = milkymist_hpdmc_class_init,
161 };
162
163 static void milkymist_hpdmc_register(void)
164 {
165 sysbus_register_withprop(&milkymist_hpdmc_info);
166 }
167
168 device_init(milkymist_hpdmc_register)