/* SPDX-License-Identifier: GPL-2.0 */
/*
* Driver definitions for the FTDI USB Single Port Serial Converter -
* known as FTDI_SIO ( Serial Input / Output application of the chipset )
*
* For USB vendor / product IDs ( VID / PID ) , please see ftdi_sio_ids . h
*
*
* The example I have is known as the USC - 1000 which is available from
* http : //www.dse.co.nz - cat no XH4214 It looks similar to this:
* http : //www.dansdata.com/usbser.htm but I can't be sure There are other
* USC - 1000 s which don ' t look like my device though so beware !
*
* The device is based on the FTDI FT8U100AX chip . It has a DB25 on one side ,
* USB on the other .
*
* Thanx to FTDI ( http : //www.ftdichip.com) for so kindly providing details
* of the protocol required to talk to the device and ongoing assistence
* during development .
*
* Bill Ryder - bryder @ sgi . com formerly of Silicon Graphics , Inc . - wrote the
* FTDI_SIO implementation .
*
*/
/* Commands */
#define FTDI_SIO_RESET 0 /* Reset the port */
#define FTDI_SIO_MODEM_CTRL 1 /* Set the modem control register */
#define FTDI_SIO_SET_FLOW_CTRL 2 /* Set flow control register */
#define FTDI_SIO_SET_BAUD_RATE 3 /* Set baud rate */
#define FTDI_SIO_SET_DATA 4 /* Set the data characteristics of
the port */
#define FTDI_SIO_GET_MODEM_STATUS 5 /* Retrieve current value of modem
status register */
#define FTDI_SIO_SET_EVENT_CHAR 6 /* Set the event character */
#define FTDI_SIO_SET_ERROR_CHAR 7 /* Set the error character */
#define FTDI_SIO_SET_LATENCY_TIMER 9 /* Set the latency timer */
#define FTDI_SIO_GET_LATENCY_TIMER 0 x0a /* Get the latency timer */
#define FTDI_SIO_SET_BITMODE 0 x0b /* Set bitbang mode */
#define FTDI_SIO_READ_PINS 0 x0c /* Read immediate value of pins */
#define FTDI_SIO_READ_EEPROM 0 x90 /* Read EEPROM */
/* Channel indices for FT2232, FT2232H and FT4232H devices */
#define CHANNEL_A 1
#define CHANNEL_B 2
#define CHANNEL_C 3
#define CHANNEL_D 4
/*
* BmRequestType : 1100 0000 b
* bRequest : FTDI_E2_READ
* wValue : 0
* wIndex : Address of word to read
* wLength : 2
* Data : Will return a word of data from E2Address
*
*/
/* Port Identifier Table */
#define PIT_DEFAULT 0 /* SIOA */
#define PIT_SIOA 1 /* SIOA */
/* The device this driver is tested with one has only one port */
#define PIT_SIOB 2 /* SIOB */
#define PIT_PARALLEL 3 /* Parallel */
/* FTDI_SIO_RESET */
#define FTDI_SIO_RESET_REQUEST FTDI_SIO_RESET
#define FTDI_SIO_RESET_REQUEST_TYPE 0 x40
#define FTDI_SIO_RESET_SIO 0
#define FTDI_SIO_RESET_PURGE_RX 1
#define FTDI_SIO_RESET_PURGE_TX 2
/*
* BmRequestType : 0100 0000 B
* bRequest : FTDI_SIO_RESET
* wValue : Control Value
* 0 = Reset SIO
* 1 = Purge RX buffer
* 2 = Purge TX buffer
* wIndex : Port
* wLength : 0
* Data : None
*
* The Reset SIO command has this effect :
*
* Sets flow control set to ' none '
* Event char = $ 0 D
* Event trigger = disabled
* Purge RX buffer
* Purge TX buffer
* Clear DTR
* Clear RTS
* baud and data format not reset
*
* The Purge RX and TX buffer commands affect nothing except the buffers
*
*/
/* FTDI_SIO_SET_BAUDRATE */
#define FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE 0 x40
#define FTDI_SIO_SET_BAUDRATE_REQUEST 3
/*
* BmRequestType : 0100 0000 B
* bRequest : FTDI_SIO_SET_BAUDRATE
* wValue : BaudDivisor value - see below
* wIndex : Port
* wLength : 0
* Data : None
* The BaudDivisor values are calculated as follows :
* - BaseClock is either 12000000 or 48000000 depending on the device .
* FIXME : I wish I knew how to detect old chips to select proper base clock !
* - BaudDivisor is a fixed point number encoded in a funny way .
* ( - - WRONG WAY OF THINKING - - )
* BaudDivisor is a fixed point number encoded with following bit weighs :
* ( - 2 ) ( - 1 ) ( 13 . . 0 ) . It is a radical with a denominator of 4 , so values
* end with 0 . 0 ( 00 . . . ) , 0 . 25 ( 10 . . . ) , 0 . 5 ( 01 . . . ) , and 0 . 75 ( 11 . . . ) .
* ( - - THE REALITY - - )
* The both - bits - set has quite different meaning from 0 . 75 - the chip
* designers have decided it to mean 0 . 125 instead of 0 . 75 .
* This info looked up in FTDI application note " FT8U232 DEVICES \ Data Rates
* and Flow Control Consideration for USB to RS232 " .
* - BaudDivisor = ( BaseClock / 16 ) / BaudRate , where the ( = ) operation should
* automagically re - encode the resulting value to take fractions into
* consideration .
* As all values are integers , some bit twiddling is in order :
* BaudDivisor = ( BaseClock / 16 / BaudRate ) |
* ( ( ( BaseClock / 2 / BaudRate ) & 4 ) ? 0 x4000 // 0.5
* : ( ( BaseClock / 2 / BaudRate ) & 2 ) ? 0 x8000 // 0.25
* : ( ( BaseClock / 2 / BaudRate ) & 1 ) ? 0 xc000 // 0.125
* : 0 )
*
* For the FT232BM , a 17 th divisor bit was introduced to encode the multiples
* of 0 . 125 missing from the FT8U232AM . Bits 16 to 14 are coded as follows
* ( the first four codes are the same as for the FT8U232AM , where bit 16 is
* always 0 ) :
* 000 - add . 000 to divisor
* 001 - add . 500 to divisor
* 010 - add . 250 to divisor
* 011 - add . 125 to divisor
* 100 - add . 375 to divisor
* 101 - add . 625 to divisor
* 110 - add . 750 to divisor
* 111 - add . 875 to divisor
* Bits 15 to 0 of the 17 - bit divisor are placed in the urb value . Bit 16 is
* placed in bit 0 of the urb index .
*
* Note that there are a couple of special cases to support the highest baud
* rates . If the calculated divisor value is 1 , this needs to be replaced with
* 0 . Additionally for the FT232BM , if the calculated divisor value is 0 x4001
* ( 1 . 5 ) , this needs to be replaced with 0 x0001 ( 1 ) ( but this divisor value is
* not supported by the FT8U232AM ) .
*/
enum ftdi_sio_baudrate {
ftdi_sio_b300 = 0 ,
ftdi_sio_b600 = 1 ,
ftdi_sio_b1200 = 2 ,
ftdi_sio_b2400 = 3 ,
ftdi_sio_b4800 = 4 ,
ftdi_sio_b9600 = 5 ,
ftdi_sio_b19200 = 6 ,
ftdi_sio_b38400 = 7 ,
ftdi_sio_b57600 = 8 ,
ftdi_sio_b115200 = 9
};
/*
* The ftdi_8U232AM_xxMHz_byyy constants have been removed . The encoded divisor
* values are calculated internally .
*/
#define FTDI_SIO_SET_DATA_REQUEST FTDI_SIO_SET_DATA
#define FTDI_SIO_SET_DATA_REQUEST_TYPE 0 x40
#define FTDI_SIO_SET_DATA_PARITY_NONE (0 x0 << 8 )
#define FTDI_SIO_SET_DATA_PARITY_ODD (0 x1 << 8 )
#define FTDI_SIO_SET_DATA_PARITY_EVEN (0 x2 << 8 )
#define FTDI_SIO_SET_DATA_PARITY_MARK (0 x3 << 8 )
#define FTDI_SIO_SET_DATA_PARITY_SPACE (0 x4 << 8 )
#define FTDI_SIO_SET_DATA_STOP_BITS_1 (0 x0 << 11 )
#define FTDI_SIO_SET_DATA_STOP_BITS_15 (0 x1 << 11 )
#define FTDI_SIO_SET_DATA_STOP_BITS_2 (0 x2 << 11 )
#define FTDI_SIO_SET_BREAK (0 x1 << 14 )
/* FTDI_SIO_SET_DATA */
/*
* BmRequestType : 0100 0000 B
* bRequest : FTDI_SIO_SET_DATA
* wValue : Data characteristics ( see below )
* wIndex : Port
* wLength : 0
* Data : No
*
* Data characteristics
*
* B0 . . 7 Number of data bits
* B8 . . 10 Parity
* 0 = None
* 1 = Odd
* 2 = Even
* 3 = Mark
* 4 = Space
* B11 . . 13 Stop Bits
* 0 = 1
* 1 = 1 . 5
* 2 = 2
* B14
* 1 = TX ON ( break )
* 0 = TX OFF ( normal state )
* B15 Reserved
*
*/
/* FTDI_SIO_MODEM_CTRL */
#define FTDI_SIO_SET_MODEM_CTRL_REQUEST_TYPE 0 x40
#define FTDI_SIO_SET_MODEM_CTRL_REQUEST FTDI_SIO_MODEM_CTRL
/*
* BmRequestType : 0100 0000 B
* bRequest : FTDI_SIO_MODEM_CTRL
* wValue : ControlValue ( see below )
* wIndex : Port
* wLength : 0
* Data : None
*
* NOTE : If the device is in RTS / CTS flow control , the RTS set by this
* command will be IGNORED without an error being returned
* Also - you can not set DTR and RTS with one control message
*/
#define FTDI_SIO_SET_DTR_MASK 0 x1
#define FTDI_SIO_SET_DTR_HIGH ((FTDI_SIO_SET_DTR_MASK << 8 ) | 1 )
#define FTDI_SIO_SET_DTR_LOW ((FTDI_SIO_SET_DTR_MASK << 8 ) | 0 )
#define FTDI_SIO_SET_RTS_MASK 0 x2
#define FTDI_SIO_SET_RTS_HIGH ((FTDI_SIO_SET_RTS_MASK << 8 ) | 2 )
#define FTDI_SIO_SET_RTS_LOW ((FTDI_SIO_SET_RTS_MASK << 8 ) | 0 )
/*
* ControlValue
* B0 DTR state
* 0 = reset
* 1 = set
* B1 RTS state
* 0 = reset
* 1 = set
* B2 . . 7 Reserved
* B8 DTR state enable
* 0 = ignore
* 1 = use DTR state
* B9 RTS state enable
* 0 = ignore
* 1 = use RTS state
* B10 . . 15 Reserved
*/
/* FTDI_SIO_SET_FLOW_CTRL */
#define FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE 0 x40
#define FTDI_SIO_SET_FLOW_CTRL_REQUEST FTDI_SIO_SET_FLOW_CTRL
#define FTDI_SIO_DISABLE_FLOW_CTRL 0 x0
#define FTDI_SIO_RTS_CTS_HS (0 x1 << 8 )
#define FTDI_SIO_DTR_DSR_HS (0 x2 << 8 )
#define FTDI_SIO_XON_XOFF_HS (0 x4 << 8 )
/*
* BmRequestType : 0100 0000 b
* bRequest : FTDI_SIO_SET_FLOW_CTRL
* wValue : Xoff / Xon
* wIndex : Protocol / Port - hIndex is protocol / lIndex is port
* wLength : 0
* Data : None
*
* hIndex protocol is :
* B0 Output handshaking using RTS / CTS
* 0 = disabled
* 1 = enabled
* B1 Output handshaking using DTR / DSR
* 0 = disabled
* 1 = enabled
* B2 Xon / Xoff handshaking
* 0 = disabled
* 1 = enabled
*
* A value of zero in the hIndex field disables handshaking
*
* If Xon / Xoff handshaking is specified , the hValue field should contain the
* XOFF character and the lValue field contains the XON character .
*/
/*
* FTDI_SIO_GET_LATENCY_TIMER
*
* Set the timeout interval . The FTDI collects data from the
* device , transmitting it to the host when either A ) 62 bytes are
* received , or B ) the timeout interval has elapsed and the buffer
* contains at least 1 byte . Setting this value to a small number
* can dramatically improve performance for applications which send
* small packets , since the default value is 16 ms .
*/
#define FTDI_SIO_GET_LATENCY_TIMER_REQUEST FTDI_SIO_GET_LATENCY_TIMER
#define FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE 0 xC0
/*
* BmRequestType : 1100 0000 b
* bRequest : FTDI_SIO_GET_LATENCY_TIMER
* wValue : 0
* wIndex : Port
* wLength : 0
* Data : latency ( on return )
*/
/*
* FTDI_SIO_SET_LATENCY_TIMER
*
* Set the timeout interval . The FTDI collects data from the
* device , transmitting it to the host when either A ) 62 bytes are
* received , or B ) the timeout interval has elapsed and the buffer
* contains at least 1 byte . Setting this value to a small number
* can dramatically improve performance for applications which send
* small packets , since the default value is 16 ms .
*/
#define FTDI_SIO_SET_LATENCY_TIMER_REQUEST FTDI_SIO_SET_LATENCY_TIMER
#define FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE 0 x40
/*
* BmRequestType : 0100 0000 b
* bRequest : FTDI_SIO_SET_LATENCY_TIMER
* wValue : Latency ( milliseconds )
* wIndex : Port
* wLength : 0
* Data : None
*
* wValue :
* B0 . . 7 Latency timer
* B8 . . 15 0
*
*/
/*
* FTDI_SIO_SET_EVENT_CHAR
*
* Set the special event character for the specified communications port .
* If the device sees this character it will immediately return the
* data read so far - rather than wait 40 ms or until 62 bytes are read
* which is what normally happens .
*/
#define FTDI_SIO_SET_EVENT_CHAR_REQUEST FTDI_SIO_SET_EVENT_CHAR
#define FTDI_SIO_SET_EVENT_CHAR_REQUEST_TYPE 0 x40
/*
* BmRequestType : 0100 0000 b
* bRequest : FTDI_SIO_SET_EVENT_CHAR
* wValue : EventChar
* wIndex : Port
* wLength : 0
* Data : None
*
* wValue :
* B0 . . 7 Event Character
* B8 Event Character Processing
* 0 = disabled
* 1 = enabled
* B9 . . 15 Reserved
*
*/
/* FTDI_SIO_SET_ERROR_CHAR */
/*
* Set the parity error replacement character for the specified communications
* port
*/
/*
* BmRequestType : 0100 0000 b
* bRequest : FTDI_SIO_SET_EVENT_CHAR
* wValue : Error Char
* wIndex : Port
* wLength : 0
* Data : None
*
* Error Char
* B0 . . 7 Error Character
* B8 Error Character Processing
* 0 = disabled
* 1 = enabled
* B9 . . 15 Reserved
*
*/
/* FTDI_SIO_GET_MODEM_STATUS */
/* Retrieve the current value of the modem status register */
#define FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE 0 xc0
#define FTDI_SIO_GET_MODEM_STATUS_REQUEST FTDI_SIO_GET_MODEM_STATUS
#define FTDI_SIO_CTS_MASK 0 x10
#define FTDI_SIO_DSR_MASK 0 x20
#define FTDI_SIO_RI_MASK 0 x40
#define FTDI_SIO_RLSD_MASK 0 x80
/*
* BmRequestType : 1100 0000 b
* bRequest : FTDI_SIO_GET_MODEM_STATUS
* wValue : zero
* wIndex : Port
* wLength : 1
* Data : Status
*
* One byte of data is returned
* B0 . . 3 0
* B4 CTS
* 0 = inactive
* 1 = active
* B5 DSR
* 0 = inactive
* 1 = active
* B6 Ring Indicator ( RI )
* 0 = inactive
* 1 = active
* B7 Receive Line Signal Detect ( RLSD )
* 0 = inactive
* 1 = active
*/
/* FTDI_SIO_SET_BITMODE */
#define FTDI_SIO_SET_BITMODE_REQUEST_TYPE 0 x40
#define FTDI_SIO_SET_BITMODE_REQUEST FTDI_SIO_SET_BITMODE
/* Possible bitmodes for FTDI_SIO_SET_BITMODE_REQUEST */
#define FTDI_SIO_BITMODE_RESET 0 x00
#define FTDI_SIO_BITMODE_CBUS 0 x20
/* FTDI_SIO_READ_PINS */
#define FTDI_SIO_READ_PINS_REQUEST_TYPE 0 xc0
#define FTDI_SIO_READ_PINS_REQUEST FTDI_SIO_READ_PINS
/*
* FTDI_SIO_READ_EEPROM
*
* EEPROM format found in FTDI AN_201 , " FT - X MTP memory Configuration " ,
* http : //www.ftdichip.com/Support/Documents/AppNotes/AN_201_FT-X%20MTP%20Memory%20Configuration.pdf
*/
#define FTDI_SIO_READ_EEPROM_REQUEST_TYPE 0 xc0
#define FTDI_SIO_READ_EEPROM_REQUEST FTDI_SIO_READ_EEPROM
#define FTDI_FTX_CBUS_MUX_GPIO 0 x8
#define FTDI_FT232R_CBUS_MUX_GPIO 0 xa
/* Descriptors returned by the device
*
* Device Descriptor
*
* Offset Field Size Value Description
* 0 bLength 1 0 x12 Size of descriptor in bytes
* 1 bDescriptorType 1 0 x01 DEVICE Descriptor Type
* 2 bcdUSB 2 0 x0110 USB Spec Release Number
* 4 bDeviceClass 1 0 x00 Class Code
* 5 bDeviceSubClass 1 0 x00 SubClass Code
* 6 bDeviceProtocol 1 0 x00 Protocol Code
* 7 bMaxPacketSize0 1 0 x08 Maximum packet size for endpoint 0
* 8 idVendor 2 0 x0403 Vendor ID
* 10 idProduct 2 0 x8372 Product ID ( FTDI_SIO_PID )
* 12 bcdDevice 2 0 x0001 Device release number
* 14 iManufacturer 1 0 x01 Index of man . string desc
* 15 iProduct 1 0 x02 Index of prod string desc
* 16 iSerialNumber 1 0 x02 Index of serial nmr string desc
* 17 bNumConfigurations 1 0 x01 Number of possible configurations
*
* Configuration Descriptor
*
* Offset Field Size Value
* 0 bLength 1 0 x09 Size of descriptor in bytes
* 1 bDescriptorType 1 0 x02 CONFIGURATION Descriptor Type
* 2 wTotalLength 2 0 x0020 Total length of data
* 4 bNumInterfaces 1 0 x01 Number of interfaces supported
* 5 bConfigurationValue 1 0 x01 Argument for SetCOnfiguration ( ) req
* 6 iConfiguration 1 0 x02 Index of config string descriptor
* 7 bmAttributes 1 0 x20 Config characteristics Remote Wakeup
* 8 MaxPower 1 0 x1E Max power consumption
*
* Interface Descriptor
*
* Offset Field Size Value
* 0 bLength 1 0 x09 Size of descriptor in bytes
* 1 bDescriptorType 1 0 x04 INTERFACE Descriptor Type
* 2 bInterfaceNumber 1 0 x00 Number of interface
* 3 bAlternateSetting 1 0 x00 Value used to select alternate
* 4 bNumEndpoints 1 0 x02 Number of endpoints
* 5 bInterfaceClass 1 0 xFF Class Code
* 6 bInterfaceSubClass 1 0 xFF Subclass Code
* 7 bInterfaceProtocol 1 0 xFF Protocol Code
* 8 iInterface 1 0 x02 Index of interface string description
*
* IN Endpoint Descriptor
*
* Offset Field Size Value
* 0 bLength 1 0 x07 Size of descriptor in bytes
* 1 bDescriptorType 1 0 x05 ENDPOINT descriptor type
* 2 bEndpointAddress 1 0 x82 Address of endpoint
* 3 bmAttributes 1 0 x02 Endpoint attributes - Bulk
* 4 bNumEndpoints 2 0 x0040 maximum packet size
* 5 bInterval 1 0 x00 Interval for polling endpoint
*
* OUT Endpoint Descriptor
*
* Offset Field Size Value
* 0 bLength 1 0 x07 Size of descriptor in bytes
* 1 bDescriptorType 1 0 x05 ENDPOINT descriptor type
* 2 bEndpointAddress 1 0 x02 Address of endpoint
* 3 bmAttributes 1 0 x02 Endpoint attributes - Bulk
* 4 bNumEndpoints 2 0 x0040 maximum packet size
* 5 bInterval 1 0 x00 Interval for polling endpoint
*
* DATA FORMAT
*
* IN Endpoint
*
* The device reserves the first two bytes of data on this endpoint to contain
* the current values of the modem and line status registers . In the absence of
* data , the device generates a message consisting of these two status bytes
* every 40 ms
*
* Byte 0 : Modem Status
*
* Offset Description
* B0 Reserved - must be 1
* B1 Reserved - must be 0
* B2 Reserved - must be 0
* B3 Reserved - must be 0
* B4 Clear to Send ( CTS )
* B5 Data Set Ready ( DSR )
* B6 Ring Indicator ( RI )
* B7 Receive Line Signal Detect ( RLSD )
*
* Byte 1 : Line Status
*
* Offset Description
* B0 Data Ready ( DR )
* B1 Overrun Error ( OE )
* B2 Parity Error ( PE )
* B3 Framing Error ( FE )
* B4 Break Interrupt ( BI )
* B5 Transmitter Holding Register ( THRE )
* B6 Transmitter Empty ( TEMT )
* B7 Error in RCVR FIFO
*
*/
#define FTDI_RS0_CTS (1 << 4 )
#define FTDI_RS0_DSR (1 << 5 )
#define FTDI_RS0_RI (1 << 6 )
#define FTDI_RS0_RLSD (1 << 7 )
#define FTDI_RS_DR 1
#define FTDI_RS_OE (1 <<1 )
#define FTDI_RS_PE (1 <<2 )
#define FTDI_RS_FE (1 <<3 )
#define FTDI_RS_BI (1 <<4 )
#define FTDI_RS_THRE (1 <<5 )
#define FTDI_RS_TEMT (1 <<6 )
#define FTDI_RS_FIFO (1 <<7 )
/*
* OUT Endpoint
*
* This device reserves the first bytes of data on this endpoint contain the
* length and port identifier of the message . For the FTDI USB Serial converter
* the port identifier is always 1 .
*
* Byte 0 : Line Status
*
* Offset Description
* B0 Reserved - must be 1
* B1 Reserved - must be 0
* B2 . . 7 Length of message - ( not including Byte 0 )
*
*/
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