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 = (const 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 device_class_set_legacy_reset(dc, 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 } 164