xref: /openbmc/qemu/hw/misc/msf2-sysreg.c (revision b86c6ba6)
1 /*
2  * System Register block model of Microsemi SmartFusion2.
3  *
4  * Copyright (c) 2017 Subbaraya Sundeep <sundeep.lkml@gmail.com>
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  *
11  * You should have received a copy of the GNU General Public License along
12  * with this program; if not, see <http://www.gnu.org/licenses/>.
13  */
14 
15 #include "qemu/osdep.h"
16 #include "qapi/error.h"
17 #include "qemu/log.h"
18 #include "qemu/module.h"
19 #include "hw/misc/msf2-sysreg.h"
20 #include "hw/qdev-properties.h"
21 #include "migration/vmstate.h"
22 #include "qemu/error-report.h"
23 #include "trace.h"
24 
25 static inline int msf2_divbits(uint32_t div)
26 {
27     int r = ctz32(div);
28 
29     return (div < 8) ? r : r + 1;
30 }
31 
32 static void msf2_sysreg_reset(DeviceState *d)
33 {
34     MSF2SysregState *s = MSF2_SYSREG(d);
35 
36     s->regs[MSSDDR_PLL_STATUS_LOW_CR] = 0x021A2358;
37     s->regs[MSSDDR_PLL_STATUS] = 0x3;
38     s->regs[MSSDDR_FACC1_CR] = msf2_divbits(s->apb0div) << 5 |
39                                msf2_divbits(s->apb1div) << 2;
40 }
41 
42 static uint64_t msf2_sysreg_read(void *opaque, hwaddr offset,
43     unsigned size)
44 {
45     MSF2SysregState *s = opaque;
46     uint32_t ret = 0;
47 
48     offset >>= 2;
49     if (offset < ARRAY_SIZE(s->regs)) {
50         ret = s->regs[offset];
51         trace_msf2_sysreg_read(offset << 2, ret);
52     } else {
53         qemu_log_mask(LOG_GUEST_ERROR,
54                     "%s: Bad offset 0x%08" HWADDR_PRIx "\n", __func__,
55                     offset << 2);
56     }
57 
58     return ret;
59 }
60 
61 static void msf2_sysreg_write(void *opaque, hwaddr offset,
62                           uint64_t val, unsigned size)
63 {
64     MSF2SysregState *s = opaque;
65     uint32_t newval = val;
66 
67     offset >>= 2;
68 
69     switch (offset) {
70     case MSSDDR_PLL_STATUS:
71         trace_msf2_sysreg_write_pll_status();
72         break;
73 
74     case ESRAM_CR:
75     case DDR_CR:
76     case ENVM_REMAP_BASE_CR:
77         if (newval != s->regs[offset]) {
78             qemu_log_mask(LOG_UNIMP,
79                        TYPE_MSF2_SYSREG": remapping not supported\n");
80         }
81         break;
82 
83     default:
84         if (offset < ARRAY_SIZE(s->regs)) {
85             trace_msf2_sysreg_write(offset << 2, newval, s->regs[offset]);
86             s->regs[offset] = newval;
87         } else {
88             qemu_log_mask(LOG_GUEST_ERROR,
89                         "%s: Bad offset 0x%08" HWADDR_PRIx "\n", __func__,
90                         offset << 2);
91         }
92         break;
93     }
94 }
95 
96 static const MemoryRegionOps sysreg_ops = {
97     .read = msf2_sysreg_read,
98     .write = msf2_sysreg_write,
99     .endianness = DEVICE_NATIVE_ENDIAN,
100 };
101 
102 static void msf2_sysreg_init(Object *obj)
103 {
104     MSF2SysregState *s = MSF2_SYSREG(obj);
105 
106     memory_region_init_io(&s->iomem, obj, &sysreg_ops, s, TYPE_MSF2_SYSREG,
107                           MSF2_SYSREG_MMIO_SIZE);
108     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->iomem);
109 }
110 
111 static const VMStateDescription vmstate_msf2_sysreg = {
112     .name = TYPE_MSF2_SYSREG,
113     .version_id = 1,
114     .minimum_version_id = 1,
115     .fields = (const VMStateField[]) {
116         VMSTATE_UINT32_ARRAY(regs, MSF2SysregState, MSF2_SYSREG_MMIO_SIZE / 4),
117         VMSTATE_END_OF_LIST()
118     }
119 };
120 
121 static Property msf2_sysreg_properties[] = {
122     /* default divisors in Libero GUI */
123     DEFINE_PROP_UINT8("apb0divisor", MSF2SysregState, apb0div, 2),
124     DEFINE_PROP_UINT8("apb1divisor", MSF2SysregState, apb1div, 2),
125     DEFINE_PROP_END_OF_LIST(),
126 };
127 
128 static void msf2_sysreg_realize(DeviceState *dev, Error **errp)
129 {
130     MSF2SysregState *s = MSF2_SYSREG(dev);
131 
132     if ((s->apb0div > 32 || !is_power_of_2(s->apb0div))
133         || (s->apb1div > 32 || !is_power_of_2(s->apb1div))) {
134         error_setg(errp, "Invalid apb divisor value");
135         error_append_hint(errp, "apb divisor must be a power of 2"
136                            " and maximum value is 32\n");
137     }
138 }
139 
140 static void msf2_sysreg_class_init(ObjectClass *klass, void *data)
141 {
142     DeviceClass *dc = DEVICE_CLASS(klass);
143 
144     dc->vmsd = &vmstate_msf2_sysreg;
145     dc->reset = msf2_sysreg_reset;
146     device_class_set_props(dc, msf2_sysreg_properties);
147     dc->realize = msf2_sysreg_realize;
148 }
149 
150 static const TypeInfo msf2_sysreg_info = {
151     .name  = TYPE_MSF2_SYSREG,
152     .parent = TYPE_SYS_BUS_DEVICE,
153     .class_init = msf2_sysreg_class_init,
154     .instance_size  = sizeof(MSF2SysregState),
155     .instance_init = msf2_sysreg_init,
156 };
157 
158 static void msf2_sysreg_register_types(void)
159 {
160     type_register_static(&msf2_sysreg_info);
161 }
162 
163 type_init(msf2_sysreg_register_types)
164