1 /* 2 * QEMU Intel 82374 emulation (Enhanced DMA controller) 3 * 4 * Copyright (c) 2010 Hervé Poussineau 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "qapi/error.h" 27 #include "qemu/module.h" 28 #include "hw/isa/isa.h" 29 #include "hw/qdev-properties.h" 30 #include "migration/vmstate.h" 31 #include "hw/dma/i8257.h" 32 33 #define TYPE_I82374 "i82374" 34 #define I82374(obj) OBJECT_CHECK(I82374State, (obj), TYPE_I82374) 35 36 //#define DEBUG_I82374 37 38 #ifdef DEBUG_I82374 39 #define DPRINTF(fmt, ...) \ 40 do { fprintf(stderr, "i82374: " fmt , ## __VA_ARGS__); } while (0) 41 #else 42 #define DPRINTF(fmt, ...) \ 43 do {} while (0) 44 #endif 45 #define BADF(fmt, ...) \ 46 do { fprintf(stderr, "i82374 ERROR: " fmt , ## __VA_ARGS__); } while (0) 47 48 typedef struct I82374State { 49 ISADevice parent_obj; 50 51 uint32_t iobase; 52 uint8_t commands[8]; 53 PortioList port_list; 54 } I82374State; 55 56 static const VMStateDescription vmstate_i82374 = { 57 .name = "i82374", 58 .version_id = 0, 59 .minimum_version_id = 0, 60 .fields = (VMStateField[]) { 61 VMSTATE_UINT8_ARRAY(commands, I82374State, 8), 62 VMSTATE_END_OF_LIST() 63 }, 64 }; 65 66 static uint32_t i82374_read_isr(void *opaque, uint32_t nport) 67 { 68 uint32_t val = 0; 69 70 BADF("%s: %08x\n", __func__, nport); 71 72 DPRINTF("%s: %08x=%08x\n", __func__, nport, val); 73 return val; 74 } 75 76 static void i82374_write_command(void *opaque, uint32_t nport, uint32_t data) 77 { 78 DPRINTF("%s: %08x=%08x\n", __func__, nport, data); 79 80 if (data != 0x42) { 81 /* Not Stop S/G command */ 82 BADF("%s: %08x=%08x\n", __func__, nport, data); 83 } 84 } 85 86 static uint32_t i82374_read_status(void *opaque, uint32_t nport) 87 { 88 uint32_t val = 0; 89 90 BADF("%s: %08x\n", __func__, nport); 91 92 DPRINTF("%s: %08x=%08x\n", __func__, nport, val); 93 return val; 94 } 95 96 static void i82374_write_descriptor(void *opaque, uint32_t nport, uint32_t data) 97 { 98 DPRINTF("%s: %08x=%08x\n", __func__, nport, data); 99 100 BADF("%s: %08x=%08x\n", __func__, nport, data); 101 } 102 103 static uint32_t i82374_read_descriptor(void *opaque, uint32_t nport) 104 { 105 uint32_t val = 0; 106 107 BADF("%s: %08x\n", __func__, nport); 108 109 DPRINTF("%s: %08x=%08x\n", __func__, nport, val); 110 return val; 111 } 112 113 static const MemoryRegionPortio i82374_portio_list[] = { 114 { 0x0A, 1, 1, .read = i82374_read_isr, }, 115 { 0x10, 8, 1, .write = i82374_write_command, }, 116 { 0x18, 8, 1, .read = i82374_read_status, }, 117 { 0x20, 0x20, 1, 118 .write = i82374_write_descriptor, .read = i82374_read_descriptor, }, 119 PORTIO_END_OF_LIST(), 120 }; 121 122 static void i82374_realize(DeviceState *dev, Error **errp) 123 { 124 I82374State *s = I82374(dev); 125 ISABus *isa_bus = isa_bus_from_device(ISA_DEVICE(dev)); 126 127 if (isa_get_dma(isa_bus, 0)) { 128 error_setg(errp, "DMA already initialized on ISA bus"); 129 return; 130 } 131 i8257_dma_init(isa_bus, true); 132 133 portio_list_init(&s->port_list, OBJECT(s), i82374_portio_list, s, 134 "i82374"); 135 portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj), 136 s->iobase); 137 138 memset(s->commands, 0, sizeof(s->commands)); 139 } 140 141 static Property i82374_properties[] = { 142 DEFINE_PROP_UINT32("iobase", I82374State, iobase, 0x400), 143 DEFINE_PROP_END_OF_LIST() 144 }; 145 146 static void i82374_class_init(ObjectClass *klass, void *data) 147 { 148 DeviceClass *dc = DEVICE_CLASS(klass); 149 150 dc->realize = i82374_realize; 151 dc->vmsd = &vmstate_i82374; 152 dc->props = i82374_properties; 153 } 154 155 static const TypeInfo i82374_info = { 156 .name = TYPE_I82374, 157 .parent = TYPE_ISA_DEVICE, 158 .instance_size = sizeof(I82374State), 159 .class_init = i82374_class_init, 160 }; 161 162 static void i82374_register_types(void) 163 { 164 type_register_static(&i82374_info); 165 } 166 167 type_init(i82374_register_types) 168