hw/misc/allwinner-h3-sysctrl.c

   1 /*
   2  * Allwinner H3 System Control emulation
   3  *
   4  * Copyright (C) 2019 Niek Linnenbank <nieklinnenbank@gmail.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qemu/units.h"
  22 #include "hw/sysbus.h"
  23 #include "migration/vmstate.h"
  24 #include "qemu/log.h"
  25 #include "qemu/module.h"
  26 #include "hw/misc/allwinner-h3-sysctrl.h"
  27
  28 /* System Control register offsets */
  29 enum {
  30     REG_VER               = 0x24,  /* Version */
  31     REG_EMAC_PHY_CLK      = 0x30,  /* EMAC PHY Clock */
  32 };
  33
  34 #define REG_INDEX(offset)   (offset / sizeof(uint32_t))
  35
  36 /* System Control register reset values */
  37 enum {
  38     REG_VER_RST           = 0x0,
  39     REG_EMAC_PHY_CLK_RST  = 0x58000,
  40 };
  41
  42 static uint64_t allwinner_h3_sysctrl_read(void *opaque, hwaddr offset,
  43                                           unsigned size)
  44 {
  45     const AwH3SysCtrlState *s = AW_H3_SYSCTRL(opaque);
  46     const uint32_t idx = REG_INDEX(offset);
  47
  48     if (idx >= AW_H3_SYSCTRL_REGS_NUM) {
  49         qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n",
  50                       __func__, (uint32_t)offset);
  51         return 0;
  52     }
  53
  54     return s->regs[idx];
  55 }
  56
  57 static void allwinner_h3_sysctrl_write(void *opaque, hwaddr offset,
  58                                        uint64_t val, unsigned size)
  59 {
  60     AwH3SysCtrlState *s = AW_H3_SYSCTRL(opaque);
  61     const uint32_t idx = REG_INDEX(offset);
  62
  63     if (idx >= AW_H3_SYSCTRL_REGS_NUM) {
  64         qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n",
  65                       __func__, (uint32_t)offset);
  66         return;
  67     }
  68
  69     switch (offset) {
  70     case REG_VER:       /* Version */
  71         break;
  72     default:
  73         s->regs[idx] = (uint32_t) val;
  74         break;
  75     }
  76 }
  77
  78 static const MemoryRegionOps allwinner_h3_sysctrl_ops = {
  79     .read = allwinner_h3_sysctrl_read,
  80     .write = allwinner_h3_sysctrl_write,
  81     .endianness = DEVICE_NATIVE_ENDIAN,
  82     .valid = {
  83         .min_access_size = 4,
  84         .max_access_size = 4,
  85     },
  86     .impl.min_access_size = 4,
  87 };
  88
  89 static void allwinner_h3_sysctrl_reset(DeviceState *dev)
  90 {
  91     AwH3SysCtrlState *s = AW_H3_SYSCTRL(dev);
  92
  93     /* Set default values for registers */
  94     s->regs[REG_INDEX(REG_VER)] = REG_VER_RST;
  95     s->regs[REG_INDEX(REG_EMAC_PHY_CLK)] = REG_EMAC_PHY_CLK_RST;
  96 }
  97
  98 static void allwinner_h3_sysctrl_init(Object *obj)
  99 {
 100     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 101     AwH3SysCtrlState *s = AW_H3_SYSCTRL(obj);
 102
 103     /* Memory mapping */
 104     memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_h3_sysctrl_ops, s,
 105                            TYPE_AW_H3_SYSCTRL, 4 * KiB);
 106     sysbus_init_mmio(sbd, &s->iomem);
 107 }
 108
 109 static const VMStateDescription allwinner_h3_sysctrl_vmstate = {
 110     .name = "allwinner-h3-sysctrl",
 111     .version_id = 1,
 112     .minimum_version_id = 1,
 113     .fields = (const VMStateField[]) {
 114         VMSTATE_UINT32_ARRAY(regs, AwH3SysCtrlState, AW_H3_SYSCTRL_REGS_NUM),
 115         VMSTATE_END_OF_LIST()
 116     }
 117 };
 118
 119 static void allwinner_h3_sysctrl_class_init(ObjectClass *klass, void *data)
 120 {
 121     DeviceClass *dc = DEVICE_CLASS(klass);
 122
 123     device_class_set_legacy_reset(dc, allwinner_h3_sysctrl_reset);
 124     dc->vmsd = &allwinner_h3_sysctrl_vmstate;
 125 }
 126
 127 static const TypeInfo allwinner_h3_sysctrl_info = {
 128     .name          = TYPE_AW_H3_SYSCTRL,
 129     .parent        = TYPE_SYS_BUS_DEVICE,
 130     .instance_init = allwinner_h3_sysctrl_init,
 131     .instance_size = sizeof(AwH3SysCtrlState),
 132     .class_init    = allwinner_h3_sysctrl_class_init,
 133 };
 134
 135 static void allwinner_h3_sysctrl_register(void)
 136 {
 137     type_register_static(&allwinner_h3_sysctrl_info);
 138 }
 139
 140 type_init(allwinner_h3_sysctrl_register)