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/*
* 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 "qemu/osdep.h"
#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
/* A 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;
/* Reason: pointer property "data" */
dc->cannot_instantiate_with_device_add_yet = true;
}
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(I2CBus *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);
}
}
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