diff options
Diffstat (limited to 'hw/i2c/smbus_eeprom.c')
| -rw-r--r-- | hw/i2c/smbus_eeprom.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/hw/i2c/smbus_eeprom.c b/hw/i2c/smbus_eeprom.c new file mode 100644 index 0000000000..0154283762 --- /dev/null +++ b/hw/i2c/smbus_eeprom.c @@ -0,0 +1,156 @@ +/* + * QEMU SMBus EEPROM device + * + * Copyright (c) 2007 Arastra, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "hw/hw.h" +#include "hw/i2c/i2c.h" +#include "hw/i2c/smbus.h" + +//#define DEBUG + +typedef struct SMBusEEPROMDevice { + SMBusDevice smbusdev; + void *data; + uint8_t offset; +} SMBusEEPROMDevice; + +static void eeprom_quick_cmd(SMBusDevice *dev, uint8_t read) +{ +#ifdef DEBUG + printf("eeprom_quick_cmd: addr=0x%02x read=%d\n", dev->i2c.address, read); +#endif +} + +static void eeprom_send_byte(SMBusDevice *dev, uint8_t val) +{ + SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; +#ifdef DEBUG + printf("eeprom_send_byte: addr=0x%02x val=0x%02x\n", + dev->i2c.address, val); +#endif + eeprom->offset = val; +} + +static uint8_t eeprom_receive_byte(SMBusDevice *dev) +{ + SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; + uint8_t *data = eeprom->data; + uint8_t val = data[eeprom->offset++]; +#ifdef DEBUG + printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n", + dev->i2c.address, val); +#endif + return val; +} + +static void eeprom_write_data(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len) +{ + SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; + int n; +#ifdef DEBUG + printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n", + dev->i2c.address, cmd, buf[0]); +#endif + /* An page write operation is not a valid SMBus command. + It is a block write without a length byte. Fortunately we + get the full block anyway. */ + /* TODO: Should this set the current location? */ + if (cmd + len > 256) + n = 256 - cmd; + else + n = len; + memcpy(eeprom->data + cmd, buf, n); + len -= n; + if (len) + memcpy(eeprom->data, buf + n, len); +} + +static uint8_t eeprom_read_data(SMBusDevice *dev, uint8_t cmd, int n) +{ + SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; + /* If this is the first byte then set the current position. */ + if (n == 0) + eeprom->offset = cmd; + /* As with writes, we implement block reads without the + SMBus length byte. */ + return eeprom_receive_byte(dev); +} + +static int smbus_eeprom_initfn(SMBusDevice *dev) +{ + SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *)dev; + + eeprom->offset = 0; + return 0; +} + +static Property smbus_eeprom_properties[] = { + DEFINE_PROP_PTR("data", SMBusEEPROMDevice, data), + DEFINE_PROP_END_OF_LIST(), +}; + +static void smbus_eeprom_class_initfn(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + SMBusDeviceClass *sc = SMBUS_DEVICE_CLASS(klass); + + sc->init = smbus_eeprom_initfn; + sc->quick_cmd = eeprom_quick_cmd; + sc->send_byte = eeprom_send_byte; + sc->receive_byte = eeprom_receive_byte; + sc->write_data = eeprom_write_data; + sc->read_data = eeprom_read_data; + dc->props = smbus_eeprom_properties; +} + +static const TypeInfo smbus_eeprom_info = { + .name = "smbus-eeprom", + .parent = TYPE_SMBUS_DEVICE, + .instance_size = sizeof(SMBusEEPROMDevice), + .class_init = smbus_eeprom_class_initfn, +}; + +static void smbus_eeprom_register_types(void) +{ + type_register_static(&smbus_eeprom_info); +} + +type_init(smbus_eeprom_register_types) + +void smbus_eeprom_init(i2c_bus *smbus, int nb_eeprom, + const uint8_t *eeprom_spd, int eeprom_spd_size) +{ + int i; + uint8_t *eeprom_buf = g_malloc0(8 * 256); /* XXX: make this persistent */ + if (eeprom_spd_size > 0) { + memcpy(eeprom_buf, eeprom_spd, eeprom_spd_size); + } + + for (i = 0; i < nb_eeprom; i++) { + DeviceState *eeprom; + eeprom = qdev_create((BusState *)smbus, "smbus-eeprom"); + qdev_prop_set_uint8(eeprom, "address", 0x50 + i); + qdev_prop_set_ptr(eeprom, "data", eeprom_buf + (i * 256)); + qdev_init_nofail(eeprom); + } +} |