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 "hw/isa/isa.h" 27 28 #define TYPE_I82374 "i82374" 29 #define I82374(obj) OBJECT_CHECK(I82374State, (obj), TYPE_I82374) 30 31 //#define DEBUG_I82374 32 33 #ifdef DEBUG_I82374 34 #define DPRINTF(fmt, ...) \ 35 do { fprintf(stderr, "i82374: " fmt , ## __VA_ARGS__); } while (0) 36 #else 37 #define DPRINTF(fmt, ...) \ 38 do {} while (0) 39 #endif 40 #define BADF(fmt, ...) \ 41 do { fprintf(stderr, "i82374 ERROR: " fmt , ## __VA_ARGS__); } while (0) 42 43 typedef struct I82374State { 44 ISADevice parent_obj; 45 46 uint32_t iobase; 47 uint8_t commands[8]; 48 PortioList port_list; 49 } I82374State; 50 51 static const VMStateDescription vmstate_i82374 = { 52 .name = "i82374", 53 .version_id = 0, 54 .minimum_version_id = 0, 55 .fields = (VMStateField[]) { 56 VMSTATE_UINT8_ARRAY(commands, I82374State, 8), 57 VMSTATE_END_OF_LIST() 58 }, 59 }; 60 61 static uint32_t i82374_read_isr(void *opaque, uint32_t nport) 62 { 63 uint32_t val = 0; 64 65 BADF("%s: %08x\n", __func__, nport); 66 67 DPRINTF("%s: %08x=%08x\n", __func__, nport, val); 68 return val; 69 } 70 71 static void i82374_write_command(void *opaque, uint32_t nport, uint32_t data) 72 { 73 DPRINTF("%s: %08x=%08x\n", __func__, nport, data); 74 75 if (data != 0x42) { 76 /* Not Stop S/G command */ 77 BADF("%s: %08x=%08x\n", __func__, nport, data); 78 } 79 } 80 81 static uint32_t i82374_read_status(void *opaque, uint32_t nport) 82 { 83 uint32_t val = 0; 84 85 BADF("%s: %08x\n", __func__, nport); 86 87 DPRINTF("%s: %08x=%08x\n", __func__, nport, val); 88 return val; 89 } 90 91 static void i82374_write_descriptor(void *opaque, uint32_t nport, uint32_t data) 92 { 93 DPRINTF("%s: %08x=%08x\n", __func__, nport, data); 94 95 BADF("%s: %08x=%08x\n", __func__, nport, data); 96 } 97 98 static uint32_t i82374_read_descriptor(void *opaque, uint32_t nport) 99 { 100 uint32_t val = 0; 101 102 BADF("%s: %08x\n", __func__, nport); 103 104 DPRINTF("%s: %08x=%08x\n", __func__, nport, val); 105 return val; 106 } 107 108 static const MemoryRegionPortio i82374_portio_list[] = { 109 { 0x0A, 1, 1, .read = i82374_read_isr, }, 110 { 0x10, 8, 1, .write = i82374_write_command, }, 111 { 0x18, 8, 1, .read = i82374_read_status, }, 112 { 0x20, 0x20, 1, 113 .write = i82374_write_descriptor, .read = i82374_read_descriptor, }, 114 PORTIO_END_OF_LIST(), 115 }; 116 117 static void i82374_realize(DeviceState *dev, Error **errp) 118 { 119 I82374State *s = I82374(dev); 120 121 portio_list_init(&s->port_list, OBJECT(s), i82374_portio_list, s, 122 "i82374"); 123 portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj), 124 s->iobase); 125 126 DMA_init(isa_bus_from_device(ISA_DEVICE(dev)), 1); 127 memset(s->commands, 0, sizeof(s->commands)); 128 } 129 130 static Property i82374_properties[] = { 131 DEFINE_PROP_UINT32("iobase", I82374State, iobase, 0x400), 132 DEFINE_PROP_END_OF_LIST() 133 }; 134 135 static void i82374_class_init(ObjectClass *klass, void *data) 136 { 137 DeviceClass *dc = DEVICE_CLASS(klass); 138 139 dc->realize = i82374_realize; 140 dc->vmsd = &vmstate_i82374; 141 dc->props = i82374_properties; 142 } 143 144 static const TypeInfo i82374_info = { 145 .name = TYPE_I82374, 146 .parent = TYPE_ISA_DEVICE, 147 .instance_size = sizeof(I82374State), 148 .class_init = i82374_class_init, 149 }; 150 151 static void i82374_register_types(void) 152 { 153 type_register_static(&i82374_info); 154 } 155 156 type_init(i82374_register_types) 157