hw/misc/msf2-sysreg.c

   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 = (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)