Thin firmware spec

From OLPC
Revision as of 00:30, 15 April 2010 by Derosier (talk | contribs)
Jump to navigation Jump to search

This documents the thin firmware commands as found on the XO-1. For the XO-1.5 libertas_tf driver and firmware, we will follow this spec. Any deviations and changes will be marked below as we progress.


Command summary

The following table summaries the commands found in libertas_tf, and details where they are used.

XO TF commands supported.png

To determine the above matrix, we started with the command definitions defined in libertastf.h. We then did searches to collate these commands with where they appeared in libertastf and in both the XO1 Thin Firmware and the XO 1.5 Full Firmware. As expected, several commands that were added to the XO1 Thin Firmware were not present in the XO 1.5 Full Firmware. A big surprise however, was the command CMD_802_11_RF_TX_POWER which was defined in the header, supported by both firmwares, yet never implemented in libertastf.

Command details

Common

Each command packet starts with an 8 byte header, struct cmd_header which contains the basic information such as the command, the size of the packet, seqnum and result. The result code is not used in sending a command to the firmware, it should be set to 0. 

       struct cmd_header {
       	__le16 command;
       	__le16 size;
       	__le16 seqnum;
       	__le16 result;
       } __attribute__ ((packed));

All fields that are 16 or 32 bit are stored in little endian. cpu_to_le16() is typically used.

It is unfortunately common for unused values to not be properly zeroed out by the driver before sending commands to the firmware. Unused fields are generally ignored, but we still shouldn't be sending garbage data in those fields, especially in cases where the Marvell documentation states to set fields to a specific value (typically 0). This should be fixed.

CMD_GET_HW_SPEC

  • 0x0003

Description

This command queries hardware and other configuration data from the WLAN SoC, including the MAC address, multicast address list size, and hardware version number. In query, set all values to 0. The reply will return the information as per Marvell specification

Sample

 03 00 2e 00 02 00 00 00 00 00 00 00 00 00 00 00 
 ff ff ff ff ff ff 00 00 00 00 00 00 00 00 00 00 
 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Structure

struct cmd_ds_get_hw_spec {
 	struct cmd_header hdr;

 	/* HW Interface version number */
 	__le16 hwifversion;
 	/* HW version number */
 	__le16 version;
 	/* Max number of TxPD FW can handle */
 	__le16 nr_txpd;
 	/* Max no of Multicast address */
 	__le16 nr_mcast_adr;
 	/* MAC address */
 	u8 permanentaddr[6];

 	/* region Code */
 	__le16 regioncode;

 	/* Number of antenna used */
 	__le16 nr_antenna;

 	/* FW release number, example 0x01030304 = 2.3.4p1 */
 	__le32 fwrelease;

 	/* Base Address of TxPD queue */
 	__le32 wcb_base;
 	/* Read Pointer of RxPd queue */
 	__le32 rxpd_rdptr;

 	/* Write Pointer of RxPd queue */
 	__le32 rxpd_wrptr;

 	/*FW/HW capability */
 	__le32 fwcapinfo;
} __attribute__ ((packed));

Use in libertas_tf

  • Used in the 80211 ops .start


CMD_802_11_RESET

  • 0x0005

Description

Reboots the SoC. Note that this is not documented in the Marvell documentation.

  • action is set to CMD_ACT_HALT (0x0003). However, the firmware seems to do a direct reboot call on receiving the RESET command and doesn't look at the action.

Structure

struct cmd_ds_802_11_reset {
 	struct cmd_header hdr;

 	__le16 action;
};

Use in libertas_tf

  • Used by if_usb_reset_device()


CMD_MAC_MULTICAST_ADR

  • 0x0010

Description

This command is used to program multicast MAC address into the hardware filter table in the WLAN SoC. The packets sent from these multicast MAC addresses are accepted.

  • action is either CMD_ACT_GET (0x0000) or CMD_ACT_SET (0x0001)
  • The 8388 may have a maximum of 32 multicast addresses set.
  • The driver only ever sets the multicast addresses, it never reads the table.

Structure

struct cmd_ds_mac_multicast_addr {
 	struct cmd_header hdr;

 	__le16 action;
 	__le16 nr_of_adrs;
 	u8 maclist[ETH_ALEN * MRVDRV_MAX_MULTICAST_LIST_SIZE];
};

Use in libertas_tf

  • Used in the 80211 ops .configure_filter


CMD_802_11_RADIO_CONTROL

  • 0x001c

Description

This command is used to control the PHY.

  • action may be either CMD_ACT_GET (0x0000) or CMD_ACT_SET (0x0001)
  • control may either be RADIO_ON (0x0001) or RADIO_OFF (0x0000)
  • While the documentation specifies that control bits [15:1] as reserved and set to 0, I saw the driver set control to 0x0005. The driver seems to have a series of constants that it ORs with this parameter: SET_AUTO_PREAMBLE, SET_SHORT_PREAMBLE, SET_LONG_PREAMBLE. These may no longer be required, require a different command to set, or are customizations in the Firmware.

Sample

1c 00 0c 00 08 00 00 00 01 00 01 00

Structure

struct cmd_ds_802_11_radio_control {
 	struct cmd_header hdr;

 	__le16 action;
 	__le16 control;
};

Use in libertas_tf

  • Used in the 80211 ops .start
  • Used in the 80211 ops .stop
  • Used in 802.11 ops .bss_info_changed


CMD_802_11_RF_CHANNEL

  • 0x001d

Description

This command gets or sets the current channel value.

  • action may be either CMD_ACT_GET (0x0000) or CMD_ACT_SET (0x0001)
  • channel is the current channel number to set or get.
  • rftype, reserved and channellist are all listed as reserved or not used and should be set to 0.

The driver doesn't properly clear out the memory used by the structure, hence command dumps of this command show random data in rftype, reserved, and channellist fields.

Sample

1d 00 30 00 09 00 00 00 01 00 01 00 00 00 00 00 
01 00 00 00 8c 2b 18 cc 22 18 60 c0 00 38 17 cc 
00 00 00 00 00 38 17 cc 20 34 f8 c7 00 00 00 00

Structure

struct cmd_ds_802_11_rf_channel {
 	struct cmd_header hdr;

 	__le16 action;
 	__le16 channel;
 	__le16 rftype;      /* unused */
 	__le16 reserved;    /* unused */
 	u8 channellist[32]; /* unused */
};

Use in libertas_tf

  • Used in the 80211 ops .config


CMD_802_11_RF_TX_POWER

  • 0x001e

Description

This command gets or sets the transmit power level.

  • action may be either CMD_ACT_GET (0x0000) or CMD_ACT_SET (0x0001)
  • CurrentLevel defines the power level. See Marvell documentation for details.

This command is unused in the current libertas_tf driver.


CMD_MAC_CONTROL

  • 0x0028

Description

This command is used to control the hardware MAC.

  • action is a set of bitfields. See documentation for details.

Note: documentation and the defines in libertastf.h don't seem to agree.

Sample

28 00 0c 00 03 00 00 00 03 00 00 00

Structure

struct cmd_ds_mac_control {
 	struct cmd_header hdr;
 	__le16 action;
 	u16 reserved;
};

Use in libertas_tf

  • Used in lbtf_setup_firmware, called from 80211 ops .start
  • Used in the 80211 ops .configure_filter


CMD_802_11_MAC_ADDRESS

  • 0x004d

Description

Set or get the MAC address.

  • action may be either CMD_ACT_GET (0x0000) or CMD_ACT_SET (0x0001)
  • macadd is the MAC address to set.

Sample

4d 00 10 00 06 00 00 00 01 00 00 17 c4 14 68 7a

Structure

struct cmd_ds_802_11_mac_address {
 	struct cmd_header hdr;

 	__le16 action;
 	uint8_t macadd[ETH_ALEN];
};

Use in libertas_tf

  • Used in the 80211 ops .add_interface


CMD_SET_BOOT2_VER

  • 0x00a5

Description

Set the boot2 version id.

This command was added for the libertas_tf. It simply sets a version id in the firmware, I am unsure of exactly why it's necessary or what its purpose is.

  • action is 0.
  • version is the boot2 version to set. Note that this is not converted into little endian.

Sample

a5 00 0c 00 01 00 00 00 00 00 07 31

Structure

struct cmd_ds_set_boot2_ver {
 	struct cmd_header hdr;

 	__le16 action;
 	__le16 version;
};

Use in libertas_tf

  • Called during firmware loading.


CMD_802_11_BEACON_CTRL

  • 0x00b0

Description

Enable or disable the beacon, and set the interval.

  • action may be either CMD_ACT_GET (0x0000) or CMD_ACT_SET (0x0001). It looks like only SET is implemented in the thin firmware.
  • beacon_enable may either be 0 to disable, or non-0 to enable.
  • period is the beacon interval to set.

Structure

struct cmd_ds_802_11_beacon_control {
 	struct cmd_header hdr;

 	__le16 action;
 	__le16 beacon_enable;
 	__le16 beacon_period;
};

Use in libertas_tf

  • Used in the 80211 ops .config_interface
  • Used in the 80211 ops .remove_interface


CMD_802_11_BEACON_SET

  • 0x00cb

Description

Set the beacon.

  • len is the length of the data in beacon.
  • beacon is the beacon to set.

Structure

struct cmd_ds_802_11_beacon_set {
 	struct cmd_header hdr;

 	__le16 len;
 	u8 beacon[MRVL_MAX_BCN_SIZE];
};

Use in libertas_tf

  • Used in the 80211 ops .config_interface
  • Used in the 80211 ops .set_tim


CMD_802_11_SET_MODE

  • 0x00cc

Description

Set the mode.

  • mode may be one of LBTF_PASSIVE_MODE, LBTF_STA_MODE, LBTF_AP_MODE.

Sample

cc 00 0a 00 05 00 00 00 01 00

Structure

struct cmd_ds_set_mode {
 	struct cmd_header hdr;

 	__le16 mode;
};

Use in libertas_tf

  • Used in the 80211 ops .add_interface
  • Used in the 80211 ops .remove_interface


CMD_802_11_SET_BSSID

  • 0x00cd

Description

Set the bssid.

  • bssid is the bssid to set.
  • activate is non-zero to activate.

Sample

cd 00 0f 00 07 00 00 00 00 00 00 00 00 00 01

Structure

struct cmd_ds_set_bssid {
 	struct cmd_header hdr;

 	u8 bssid[6];
 	u8 activate;
};

Use in libertas_tf

  • Called during device startup.
  • Used in the 80211 ops .config_interface (to activate and set bssid)
  • Used in the 80211 ops .remove_interface (to deactivate)
Retrieved from "http://wiki.laptop.org/mediawiki/index.php?title=Thin_firmware_spec&oldid=234664"