hw/char/serial-pci-multi.c

   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         serial_exit_core(s);
  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 void multi_serial_pci_realize(PCIDevice *dev, Error **errp)
  81 {
  82     PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
  83     PCIMultiSerialState *pci = DO_UPCAST(PCIMultiSerialState, dev, dev);
  84     SerialState *s;
  85     Error *err = NULL;
  86     int i, nr_ports = 0;
  87
  88     switch (pc->device_id) {
  89     case 0x0003:
  90         nr_ports = 2;
  91         break;
  92     case 0x0004:
  93         nr_ports = 4;
  94         break;
  95     }
  96     assert(nr_ports > 0);
  97     assert(nr_ports <= PCI_SERIAL_MAX_PORTS);
  98
  99     pci->dev.config[PCI_CLASS_PROG] = pci->prog_if;
 100     pci->dev.config[PCI_INTERRUPT_PIN] = 0x01;
 101     memory_region_init(&pci->iobar, OBJECT(pci), "multiserial", 8 * nr_ports);
 102     pci_register_bar(&pci->dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &pci->iobar);
 103     pci->irqs = qemu_allocate_irqs(multi_serial_irq_mux, pci,
 104                                    nr_ports);
 105
 106     for (i = 0; i < nr_ports; i++) {
 107         s = pci->state + i;
 108         s->baudbase = 115200;
 109         serial_realize_core(s, &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 #%d", 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     dc->props = 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     dc->props = multi_4x_serial_pci_properties;
 180     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 181 }
 182
 183 static const TypeInfo multi_2x_serial_pci_info = {
 184     .name          = "pci-serial-2x",
 185     .parent        = TYPE_PCI_DEVICE,
 186     .instance_size = sizeof(PCIMultiSerialState),
 187     .class_init    = multi_2x_serial_pci_class_initfn,
 188     .interfaces = (InterfaceInfo[]) {
 189         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 190         { },
 191     },
 192 };
 193
 194 static const TypeInfo multi_4x_serial_pci_info = {
 195     .name          = "pci-serial-4x",
 196     .parent        = TYPE_PCI_DEVICE,
 197     .instance_size = sizeof(PCIMultiSerialState),
 198     .class_init    = multi_4x_serial_pci_class_initfn,
 199     .interfaces = (InterfaceInfo[]) {
 200         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 201         { },
 202     },
 203 };
 204
 205 static void multi_serial_pci_register_types(void)
 206 {
 207     type_register_static(&multi_2x_serial_pci_info);
 208     type_register_static(&multi_4x_serial_pci_info);
 209 }
 210
 211 type_init(multi_serial_pci_register_types)