hw/char/mchp_pfsoc_mmuart.c

   1 /*
   2  * Microchip PolarFire SoC MMUART emulation
   3  *
   4  * Copyright (c) 2020 Wind River Systems, Inc.
   5  *
   6  * Author:
   7  *   Bin Meng <bin.meng@windriver.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 or
  12  * (at your option) version 3 of the License.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include "qemu/osdep.h"
  24 #include "qemu/log.h"
  25 #include "qapi/error.h"
  26 #include "migration/vmstate.h"
  27 #include "hw/char/mchp_pfsoc_mmuart.h"
  28 #include "hw/qdev-properties.h"
  29
  30 #define REGS_OFFSET 0x20
  31
  32 static uint64_t mchp_pfsoc_mmuart_read(void *opaque, hwaddr addr, unsigned size)
  33 {
  34     MchpPfSoCMMUartState *s = opaque;
  35
  36     addr >>= 2;
  37     if (addr >= MCHP_PFSOC_MMUART_REG_COUNT) {
  38         qemu_log_mask(LOG_GUEST_ERROR, "%s: read: addr=0x%" HWADDR_PRIx "\n",
  39                       __func__, addr << 2);
  40         return 0;
  41     }
  42
  43     return s->reg[addr];
  44 }
  45
  46 static void mchp_pfsoc_mmuart_write(void *opaque, hwaddr addr,
  47                                     uint64_t value, unsigned size)
  48 {
  49     MchpPfSoCMMUartState *s = opaque;
  50     uint32_t val32 = (uint32_t)value;
  51
  52     addr >>= 2;
  53     if (addr >= MCHP_PFSOC_MMUART_REG_COUNT) {
  54         qemu_log_mask(LOG_GUEST_ERROR, "%s: bad write: addr=0x%" HWADDR_PRIx
  55                       " v=0x%x\n", __func__, addr << 2, val32);
  56         return;
  57     }
  58
  59     s->reg[addr] = val32;
  60 }
  61
  62 static const MemoryRegionOps mchp_pfsoc_mmuart_ops = {
  63     .read = mchp_pfsoc_mmuart_read,
  64     .write = mchp_pfsoc_mmuart_write,
  65     .endianness = DEVICE_LITTLE_ENDIAN,
  66     .impl = {
  67         .min_access_size = 4,
  68         .max_access_size = 4,
  69     },
  70 };
  71
  72 static void mchp_pfsoc_mmuart_reset(DeviceState *dev)
  73 {
  74     MchpPfSoCMMUartState *s = MCHP_PFSOC_UART(dev);
  75
  76     memset(s->reg, 0, sizeof(s->reg));
  77     device_cold_reset(DEVICE(&s->serial_mm));
  78 }
  79
  80 static void mchp_pfsoc_mmuart_init(Object *obj)
  81 {
  82     MchpPfSoCMMUartState *s = MCHP_PFSOC_UART(obj);
  83
  84     object_initialize_child(obj, "serial-mm", &s->serial_mm, TYPE_SERIAL_MM);
  85     object_property_add_alias(obj, "chardev", OBJECT(&s->serial_mm), "chardev");
  86 }
  87
  88 static void mchp_pfsoc_mmuart_realize(DeviceState *dev, Error **errp)
  89 {
  90     MchpPfSoCMMUartState *s = MCHP_PFSOC_UART(dev);
  91
  92     qdev_prop_set_uint8(DEVICE(&s->serial_mm), "regshift", 2);
  93     qdev_prop_set_uint32(DEVICE(&s->serial_mm), "baudbase", 399193);
  94     qdev_prop_set_uint8(DEVICE(&s->serial_mm), "endianness",
  95                         DEVICE_LITTLE_ENDIAN);
  96     if (!sysbus_realize(SYS_BUS_DEVICE(&s->serial_mm), errp)) {
  97         return;
  98     }
  99
 100     sysbus_pass_irq(SYS_BUS_DEVICE(dev), SYS_BUS_DEVICE(&s->serial_mm));
 101
 102     memory_region_init(&s->container, OBJECT(s), "mchp.pfsoc.mmuart", 0x1000);
 103     sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->container);
 104
 105     memory_region_add_subregion(&s->container, 0,
 106                     sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->serial_mm), 0));
 107
 108     memory_region_init_io(&s->iomem, OBJECT(s), &mchp_pfsoc_mmuart_ops, s,
 109                           "mchp.pfsoc.mmuart.regs", 0x1000 - REGS_OFFSET);
 110     memory_region_add_subregion(&s->container, REGS_OFFSET, &s->iomem);
 111 }
 112
 113 static const VMStateDescription mchp_pfsoc_mmuart_vmstate = {
 114     .name = "mchp.pfsoc.uart",
 115     .version_id = 0,
 116     .minimum_version_id = 0,
 117     .fields = (VMStateField[]) {
 118         VMSTATE_UINT32_ARRAY(reg, MchpPfSoCMMUartState,
 119                              MCHP_PFSOC_MMUART_REG_COUNT),
 120         VMSTATE_END_OF_LIST()
 121     }
 122 };
 123
 124 static void mchp_pfsoc_mmuart_class_init(ObjectClass *oc, void *data)
 125 {
 126     DeviceClass *dc = DEVICE_CLASS(oc);
 127
 128     dc->realize = mchp_pfsoc_mmuart_realize;
 129     dc->reset = mchp_pfsoc_mmuart_reset;
 130     dc->vmsd = &mchp_pfsoc_mmuart_vmstate;
 131     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 132 }
 133
 134 static const TypeInfo mchp_pfsoc_mmuart_info = {
 135     .name          = TYPE_MCHP_PFSOC_UART,
 136     .parent        = TYPE_SYS_BUS_DEVICE,
 137     .instance_size = sizeof(MchpPfSoCMMUartState),
 138     .instance_init = mchp_pfsoc_mmuart_init,
 139     .class_init    = mchp_pfsoc_mmuart_class_init,
 140 };
 141
 142 static void mchp_pfsoc_mmuart_register_types(void)
 143 {
 144     type_register_static(&mchp_pfsoc_mmuart_info);
 145 }
 146
 147 type_init(mchp_pfsoc_mmuart_register_types)
 148
 149 MchpPfSoCMMUartState *mchp_pfsoc_mmuart_create(MemoryRegion *sysmem,
 150                                                hwaddr base,
 151                                                qemu_irq irq, Chardev *chr)
 152 {
 153     DeviceState *dev = qdev_new(TYPE_MCHP_PFSOC_UART);
 154     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 155
 156     qdev_prop_set_chr(dev, "chardev", chr);
 157     sysbus_realize(sbd, &error_fatal);
 158
 159     memory_region_add_subregion(sysmem, base, sysbus_mmio_get_region(sbd, 0));
 160     sysbus_connect_irq(sbd, 0, irq);
 161
 162     return MCHP_PFSOC_UART(dev);
 163 }