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Diffstat (limited to 'qemu/hw/i2c/smbus_eeprom.c')
-rw-r--r--qemu/hw/i2c/smbus_eeprom.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/qemu/hw/i2c/smbus_eeprom.c b/qemu/hw/i2c/smbus_eeprom.c
new file mode 100644
index 000000000..72c09cba6
--- /dev/null
+++ b/qemu/hw/i2c/smbus_eeprom.c
@@ -0,0 +1,158 @@
+/*
+ * 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
+ /* 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);
+ }
+}