1 /* 2 * QEMU SMBus EEPROM device 3 * 4 * Copyright (c) 2007 Arastra, Inc. 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 "hw/hw.h" 26 #include "hw/i2c/i2c.h" 27 #include "hw/i2c/smbus.h" 28 29 //#define DEBUG 30 31 typedef struct SMBusEEPROMDevice { 32 SMBusDevice smbusdev; 33 void *data; 34 uint8_t offset; 35 } SMBusEEPROMDevice; 36 37 static void eeprom_quick_cmd(SMBusDevice *dev, uint8_t read) 38 { 39 #ifdef DEBUG 40 printf("eeprom_quick_cmd: addr=0x%02x read=%d\n", dev->i2c.address, read); 41 #endif 42 } 43 44 static void eeprom_send_byte(SMBusDevice *dev, uint8_t val) 45 { 46 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; 47 #ifdef DEBUG 48 printf("eeprom_send_byte: addr=0x%02x val=0x%02x\n", 49 dev->i2c.address, val); 50 #endif 51 eeprom->offset = val; 52 } 53 54 static uint8_t eeprom_receive_byte(SMBusDevice *dev) 55 { 56 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; 57 uint8_t *data = eeprom->data; 58 uint8_t val = data[eeprom->offset++]; 59 #ifdef DEBUG 60 printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n", 61 dev->i2c.address, val); 62 #endif 63 return val; 64 } 65 66 static void eeprom_write_data(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len) 67 { 68 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; 69 int n; 70 #ifdef DEBUG 71 printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n", 72 dev->i2c.address, cmd, buf[0]); 73 #endif 74 /* An page write operation is not a valid SMBus command. 75 It is a block write without a length byte. Fortunately we 76 get the full block anyway. */ 77 /* TODO: Should this set the current location? */ 78 if (cmd + len > 256) 79 n = 256 - cmd; 80 else 81 n = len; 82 memcpy(eeprom->data + cmd, buf, n); 83 len -= n; 84 if (len) 85 memcpy(eeprom->data, buf + n, len); 86 } 87 88 static uint8_t eeprom_read_data(SMBusDevice *dev, uint8_t cmd, int n) 89 { 90 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; 91 /* If this is the first byte then set the current position. */ 92 if (n == 0) 93 eeprom->offset = cmd; 94 /* As with writes, we implement block reads without the 95 SMBus length byte. */ 96 return eeprom_receive_byte(dev); 97 } 98 99 static int smbus_eeprom_initfn(SMBusDevice *dev) 100 { 101 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *)dev; 102 103 eeprom->offset = 0; 104 return 0; 105 } 106 107 static Property smbus_eeprom_properties[] = { 108 DEFINE_PROP_PTR("data", SMBusEEPROMDevice, data), 109 DEFINE_PROP_END_OF_LIST(), 110 }; 111 112 static void smbus_eeprom_class_initfn(ObjectClass *klass, void *data) 113 { 114 DeviceClass *dc = DEVICE_CLASS(klass); 115 SMBusDeviceClass *sc = SMBUS_DEVICE_CLASS(klass); 116 117 sc->init = smbus_eeprom_initfn; 118 sc->quick_cmd = eeprom_quick_cmd; 119 sc->send_byte = eeprom_send_byte; 120 sc->receive_byte = eeprom_receive_byte; 121 sc->write_data = eeprom_write_data; 122 sc->read_data = eeprom_read_data; 123 dc->props = smbus_eeprom_properties; 124 } 125 126 static const TypeInfo smbus_eeprom_info = { 127 .name = "smbus-eeprom", 128 .parent = TYPE_SMBUS_DEVICE, 129 .instance_size = sizeof(SMBusEEPROMDevice), 130 .class_init = smbus_eeprom_class_initfn, 131 }; 132 133 static void smbus_eeprom_register_types(void) 134 { 135 type_register_static(&smbus_eeprom_info); 136 } 137 138 type_init(smbus_eeprom_register_types) 139 140 void smbus_eeprom_init(i2c_bus *smbus, int nb_eeprom, 141 const uint8_t *eeprom_spd, int eeprom_spd_size) 142 { 143 int i; 144 uint8_t *eeprom_buf = g_malloc0(8 * 256); /* XXX: make this persistent */ 145 if (eeprom_spd_size > 0) { 146 memcpy(eeprom_buf, eeprom_spd, eeprom_spd_size); 147 } 148 149 for (i = 0; i < nb_eeprom; i++) { 150 DeviceState *eeprom; 151 eeprom = qdev_create((BusState *)smbus, "smbus-eeprom"); 152 qdev_prop_set_uint8(eeprom, "address", 0x50 + i); 153 qdev_prop_set_ptr(eeprom, "data", eeprom_buf + (i * 256)); 154 qdev_init_nofail(eeprom); 155 } 156 } 157