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 "qemu/osdep.h" 26 #include "hw/hw.h" 27 #include "hw/i2c/i2c.h" 28 #include "hw/i2c/smbus.h" 29 30 //#define DEBUG 31 32 typedef struct SMBusEEPROMDevice { 33 SMBusDevice smbusdev; 34 void *data; 35 uint8_t offset; 36 } SMBusEEPROMDevice; 37 38 static void eeprom_quick_cmd(SMBusDevice *dev, uint8_t read) 39 { 40 #ifdef DEBUG 41 printf("eeprom_quick_cmd: addr=0x%02x read=%d\n", dev->i2c.address, read); 42 #endif 43 } 44 45 static void eeprom_send_byte(SMBusDevice *dev, uint8_t val) 46 { 47 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; 48 #ifdef DEBUG 49 printf("eeprom_send_byte: addr=0x%02x val=0x%02x\n", 50 dev->i2c.address, val); 51 #endif 52 eeprom->offset = val; 53 } 54 55 static uint8_t eeprom_receive_byte(SMBusDevice *dev) 56 { 57 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; 58 uint8_t *data = eeprom->data; 59 uint8_t val = data[eeprom->offset++]; 60 #ifdef DEBUG 61 printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n", 62 dev->i2c.address, val); 63 #endif 64 return val; 65 } 66 67 static void eeprom_write_data(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len) 68 { 69 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; 70 int n; 71 #ifdef DEBUG 72 printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n", 73 dev->i2c.address, cmd, buf[0]); 74 #endif 75 /* A page write operation is not a valid SMBus command. 76 It is a block write without a length byte. Fortunately we 77 get the full block anyway. */ 78 /* TODO: Should this set the current location? */ 79 if (cmd + len > 256) 80 n = 256 - cmd; 81 else 82 n = len; 83 memcpy(eeprom->data + cmd, buf, n); 84 len -= n; 85 if (len) 86 memcpy(eeprom->data, buf + n, len); 87 } 88 89 static uint8_t eeprom_read_data(SMBusDevice *dev, uint8_t cmd, int n) 90 { 91 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; 92 /* If this is the first byte then set the current position. */ 93 if (n == 0) 94 eeprom->offset = cmd; 95 /* As with writes, we implement block reads without the 96 SMBus length byte. */ 97 return eeprom_receive_byte(dev); 98 } 99 100 static int smbus_eeprom_initfn(SMBusDevice *dev) 101 { 102 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *)dev; 103 104 eeprom->offset = 0; 105 return 0; 106 } 107 108 static Property smbus_eeprom_properties[] = { 109 DEFINE_PROP_PTR("data", SMBusEEPROMDevice, data), 110 DEFINE_PROP_END_OF_LIST(), 111 }; 112 113 static void smbus_eeprom_class_initfn(ObjectClass *klass, void *data) 114 { 115 DeviceClass *dc = DEVICE_CLASS(klass); 116 SMBusDeviceClass *sc = SMBUS_DEVICE_CLASS(klass); 117 118 sc->init = smbus_eeprom_initfn; 119 sc->quick_cmd = eeprom_quick_cmd; 120 sc->send_byte = eeprom_send_byte; 121 sc->receive_byte = eeprom_receive_byte; 122 sc->write_data = eeprom_write_data; 123 sc->read_data = eeprom_read_data; 124 dc->props = smbus_eeprom_properties; 125 /* Reason: pointer property "data" */ 126 dc->user_creatable = false; 127 } 128 129 static const TypeInfo smbus_eeprom_info = { 130 .name = "smbus-eeprom", 131 .parent = TYPE_SMBUS_DEVICE, 132 .instance_size = sizeof(SMBusEEPROMDevice), 133 .class_init = smbus_eeprom_class_initfn, 134 }; 135 136 static void smbus_eeprom_register_types(void) 137 { 138 type_register_static(&smbus_eeprom_info); 139 } 140 141 type_init(smbus_eeprom_register_types) 142 143 void smbus_eeprom_init(I2CBus *smbus, int nb_eeprom, 144 const uint8_t *eeprom_spd, int eeprom_spd_size) 145 { 146 int i; 147 uint8_t *eeprom_buf = g_malloc0(8 * 256); /* XXX: make this persistent */ 148 if (eeprom_spd_size > 0) { 149 memcpy(eeprom_buf, eeprom_spd, eeprom_spd_size); 150 } 151 152 for (i = 0; i < nb_eeprom; i++) { 153 DeviceState *eeprom; 154 eeprom = qdev_create((BusState *)smbus, "smbus-eeprom"); 155 qdev_prop_set_uint8(eeprom, "address", 0x50 + i); 156 qdev_prop_set_ptr(eeprom, "data", eeprom_buf + (i * 256)); 157 qdev_init_nofail(eeprom); 158 } 159 } 160