1 /* 2 * QEMU 16550A multi UART emulation 3 * 4 * SPDX-License-Identifier: MIT 5 * 6 * Copyright (c) 2003-2004 Fabrice Bellard 7 * Copyright (c) 2008 Citrix Systems, Inc. 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a copy 10 * of this software and associated documentation files (the "Software"), to deal 11 * in the Software without restriction, including without limitation the rights 12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 13 * copies of the Software, and to permit persons to whom the Software is 14 * furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice shall be included in 17 * all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 25 * THE SOFTWARE. 26 */ 27 28 /* see docs/specs/pci-serial.txt */ 29 30 #include "qemu/osdep.h" 31 #include "qapi/error.h" 32 #include "hw/char/serial.h" 33 #include "hw/irq.h" 34 #include "hw/pci/pci.h" 35 #include "hw/qdev-properties.h" 36 #include "migration/vmstate.h" 37 38 #define PCI_SERIAL_MAX_PORTS 4 39 40 typedef struct PCIMultiSerialState { 41 PCIDevice dev; 42 MemoryRegion iobar; 43 uint32_t ports; 44 char *name[PCI_SERIAL_MAX_PORTS]; 45 SerialState state[PCI_SERIAL_MAX_PORTS]; 46 uint32_t level[PCI_SERIAL_MAX_PORTS]; 47 qemu_irq *irqs; 48 uint8_t prog_if; 49 } PCIMultiSerialState; 50 51 static void multi_serial_pci_exit(PCIDevice *dev) 52 { 53 PCIMultiSerialState *pci = DO_UPCAST(PCIMultiSerialState, dev, dev); 54 SerialState *s; 55 int i; 56 57 for (i = 0; i < pci->ports; i++) { 58 s = pci->state + i; 59 object_property_set_bool(OBJECT(s), false, "realized", &error_abort); 60 memory_region_del_subregion(&pci->iobar, &s->io); 61 g_free(pci->name[i]); 62 } 63 qemu_free_irqs(pci->irqs, pci->ports); 64 } 65 66 static void multi_serial_irq_mux(void *opaque, int n, int level) 67 { 68 PCIMultiSerialState *pci = opaque; 69 int i, pending = 0; 70 71 pci->level[n] = level; 72 for (i = 0; i < pci->ports; i++) { 73 if (pci->level[i]) { 74 pending = 1; 75 } 76 } 77 pci_set_irq(&pci->dev, pending); 78 } 79 80 static size_t multi_serial_get_port_count(PCIDeviceClass *pc) 81 { 82 switch (pc->device_id) { 83 case 0x0003: 84 return 2; 85 case 0x0004: 86 return 4; 87 } 88 89 g_assert_not_reached(); 90 } 91 92 93 static void multi_serial_pci_realize(PCIDevice *dev, Error **errp) 94 { 95 PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev); 96 PCIMultiSerialState *pci = DO_UPCAST(PCIMultiSerialState, dev, dev); 97 SerialState *s; 98 Error *err = NULL; 99 size_t i, nports = multi_serial_get_port_count(pc); 100 101 pci->dev.config[PCI_CLASS_PROG] = pci->prog_if; 102 pci->dev.config[PCI_INTERRUPT_PIN] = 0x01; 103 memory_region_init(&pci->iobar, OBJECT(pci), "multiserial", 8 * nports); 104 pci_register_bar(&pci->dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &pci->iobar); 105 pci->irqs = qemu_allocate_irqs(multi_serial_irq_mux, pci, nports); 106 107 for (i = 0; i < nports; i++) { 108 s = pci->state + i; 109 object_property_set_bool(OBJECT(s), true, "realized", &err); 110 if (err != NULL) { 111 error_propagate(errp, err); 112 multi_serial_pci_exit(dev); 113 return; 114 } 115 s->irq = pci->irqs[i]; 116 pci->name[i] = g_strdup_printf("uart #%zu", i + 1); 117 memory_region_init_io(&s->io, OBJECT(pci), &serial_io_ops, s, 118 pci->name[i], 8); 119 memory_region_add_subregion(&pci->iobar, 8 * i, &s->io); 120 pci->ports++; 121 } 122 } 123 124 static const VMStateDescription vmstate_pci_multi_serial = { 125 .name = "pci-serial-multi", 126 .version_id = 1, 127 .minimum_version_id = 1, 128 .fields = (VMStateField[]) { 129 VMSTATE_PCI_DEVICE(dev, PCIMultiSerialState), 130 VMSTATE_STRUCT_ARRAY(state, PCIMultiSerialState, PCI_SERIAL_MAX_PORTS, 131 0, vmstate_serial, SerialState), 132 VMSTATE_UINT32_ARRAY(level, PCIMultiSerialState, PCI_SERIAL_MAX_PORTS), 133 VMSTATE_END_OF_LIST() 134 } 135 }; 136 137 static Property multi_2x_serial_pci_properties[] = { 138 DEFINE_PROP_CHR("chardev1", PCIMultiSerialState, state[0].chr), 139 DEFINE_PROP_CHR("chardev2", PCIMultiSerialState, state[1].chr), 140 DEFINE_PROP_UINT8("prog_if", PCIMultiSerialState, prog_if, 0x02), 141 DEFINE_PROP_END_OF_LIST(), 142 }; 143 144 static Property multi_4x_serial_pci_properties[] = { 145 DEFINE_PROP_CHR("chardev1", PCIMultiSerialState, state[0].chr), 146 DEFINE_PROP_CHR("chardev2", PCIMultiSerialState, state[1].chr), 147 DEFINE_PROP_CHR("chardev3", PCIMultiSerialState, state[2].chr), 148 DEFINE_PROP_CHR("chardev4", PCIMultiSerialState, state[3].chr), 149 DEFINE_PROP_UINT8("prog_if", PCIMultiSerialState, prog_if, 0x02), 150 DEFINE_PROP_END_OF_LIST(), 151 }; 152 153 static void multi_2x_serial_pci_class_initfn(ObjectClass *klass, void *data) 154 { 155 DeviceClass *dc = DEVICE_CLASS(klass); 156 PCIDeviceClass *pc = PCI_DEVICE_CLASS(klass); 157 pc->realize = multi_serial_pci_realize; 158 pc->exit = multi_serial_pci_exit; 159 pc->vendor_id = PCI_VENDOR_ID_REDHAT; 160 pc->device_id = PCI_DEVICE_ID_REDHAT_SERIAL2; 161 pc->revision = 1; 162 pc->class_id = PCI_CLASS_COMMUNICATION_SERIAL; 163 dc->vmsd = &vmstate_pci_multi_serial; 164 device_class_set_props(dc, multi_2x_serial_pci_properties); 165 set_bit(DEVICE_CATEGORY_INPUT, dc->categories); 166 } 167 168 static void multi_4x_serial_pci_class_initfn(ObjectClass *klass, void *data) 169 { 170 DeviceClass *dc = DEVICE_CLASS(klass); 171 PCIDeviceClass *pc = PCI_DEVICE_CLASS(klass); 172 pc->realize = multi_serial_pci_realize; 173 pc->exit = multi_serial_pci_exit; 174 pc->vendor_id = PCI_VENDOR_ID_REDHAT; 175 pc->device_id = PCI_DEVICE_ID_REDHAT_SERIAL4; 176 pc->revision = 1; 177 pc->class_id = PCI_CLASS_COMMUNICATION_SERIAL; 178 dc->vmsd = &vmstate_pci_multi_serial; 179 device_class_set_props(dc, multi_4x_serial_pci_properties); 180 set_bit(DEVICE_CATEGORY_INPUT, dc->categories); 181 } 182 183 static void multi_serial_init(Object *o) 184 { 185 PCIDevice *dev = PCI_DEVICE(o); 186 PCIMultiSerialState *pms = DO_UPCAST(PCIMultiSerialState, dev, dev); 187 size_t i, nports = multi_serial_get_port_count(PCI_DEVICE_GET_CLASS(dev)); 188 189 for (i = 0; i < nports; i++) { 190 object_initialize_child(o, "serial[*]", &pms->state[i], 191 sizeof(pms->state[i]), 192 TYPE_SERIAL, &error_abort, NULL); 193 } 194 } 195 196 static const TypeInfo multi_2x_serial_pci_info = { 197 .name = "pci-serial-2x", 198 .parent = TYPE_PCI_DEVICE, 199 .instance_size = sizeof(PCIMultiSerialState), 200 .instance_init = multi_serial_init, 201 .class_init = multi_2x_serial_pci_class_initfn, 202 .interfaces = (InterfaceInfo[]) { 203 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 204 { }, 205 }, 206 }; 207 208 static const TypeInfo multi_4x_serial_pci_info = { 209 .name = "pci-serial-4x", 210 .parent = TYPE_PCI_DEVICE, 211 .instance_size = sizeof(PCIMultiSerialState), 212 .instance_init = multi_serial_init, 213 .class_init = multi_4x_serial_pci_class_initfn, 214 .interfaces = (InterfaceInfo[]) { 215 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 216 { }, 217 }, 218 }; 219 220 static void multi_serial_pci_register_types(void) 221 { 222 type_register_static(&multi_2x_serial_pci_info); 223 type_register_static(&multi_4x_serial_pci_info); 224 } 225 226 type_init(multi_serial_pci_register_types) 227