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linux/drivers/usb/serial/ftdi_sio.h
Johan Hovold ff32d97e39 USB: serial: ftdi_sio: add support for FT232R CBUS gpios 
Enable support for cbus gpios on FT232R. The cbus configuration is
stored in one word in the EEPROM at offset 0x0a (byte-offset 0x14) with
the mux config for CBUS0, CBUS1, CBUS2 and CBUS3 in bits 0..3, 4..7,
8..11 and 12..15, respectively.

Tested using FT232RL by configuring one cbus pin at a time.

Signed-off-by: Johan Hovold <johan@kernel.org>
2018-10-05 08:57:06 +02:00

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/* 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-1000s 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 0x0a /* Get the latency timer */
#define FTDI_SIO_SET_BITMODE 0x0b /* Set bitbang mode */
#define FTDI_SIO_READ_PINS 0x0c /* Read immediate value of pins */
#define FTDI_SIO_READ_EEPROM 0x90 /* Read EEPROM */
/* Interface indices for FT2232, FT2232H and FT4232H devices */
#define INTERFACE_A 1
#define INTERFACE_B 2
#define INTERFACE_C 3
#define INTERFACE_D 4
/*
* BmRequestType: 1100 0000b
* 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 0x40
#define FTDI_SIO_RESET_SIO 0
#define FTDI_SIO_RESET_PURGE_RX 1
#define FTDI_SIO_RESET_PURGE_TX 2
/*
* BmRequestType: 0100 0000B
* 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 = $0D
* 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 0x40
#define FTDI_SIO_SET_BAUDRATE_REQUEST 3
/*
* BmRequestType: 0100 0000B
* 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) ? 0x4000 // 0.5
* : ((BaseClock / 2 / BaudRate) & 2) ? 0x8000 // 0.25
* : ((BaseClock / 2 / BaudRate) & 1) ? 0xc000 // 0.125
* : 0)
*
* For the FT232BM, a 17th 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 0x4001
* (1.5), this needs to be replaced with 0x0001 (1) (but this divisor value is
* not supported by the FT8U232AM).
*/
enum ftdi_chip_type {
SIO = 1,
FT8U232AM = 2,
FT232BM = 3,
FT2232C = 4,
FT232RL = 5,
FT2232H = 6,
FT4232H = 7,
FT232H = 8,
FTX = 9,
};
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 0x40
#define FTDI_SIO_SET_DATA_PARITY_NONE (0x0 << 8)
#define FTDI_SIO_SET_DATA_PARITY_ODD (0x1 << 8)
#define FTDI_SIO_SET_DATA_PARITY_EVEN (0x2 << 8)
#define FTDI_SIO_SET_DATA_PARITY_MARK (0x3 << 8)
#define FTDI_SIO_SET_DATA_PARITY_SPACE (0x4 << 8)
#define FTDI_SIO_SET_DATA_STOP_BITS_1 (0x0 << 11)
#define FTDI_SIO_SET_DATA_STOP_BITS_15 (0x1 << 11)
#define FTDI_SIO_SET_DATA_STOP_BITS_2 (0x2 << 11)
#define FTDI_SIO_SET_BREAK (0x1 << 14)
/* FTDI_SIO_SET_DATA */
/*
* BmRequestType: 0100 0000B
* 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 0x40
#define FTDI_SIO_SET_MODEM_CTRL_REQUEST FTDI_SIO_MODEM_CTRL
/*
* BmRequestType: 0100 0000B
* 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 0x1
#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 0x2
#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 0x40
#define FTDI_SIO_SET_FLOW_CTRL_REQUEST FTDI_SIO_SET_FLOW_CTRL
#define FTDI_SIO_DISABLE_FLOW_CTRL 0x0
#define FTDI_SIO_RTS_CTS_HS (0x1 << 8)
#define FTDI_SIO_DTR_DSR_HS (0x2 << 8)
#define FTDI_SIO_XON_XOFF_HS (0x4 << 8)
/*
* BmRequestType: 0100 0000b
* 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 slave
* 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 16ms.
*/
#define FTDI_SIO_GET_LATENCY_TIMER_REQUEST FTDI_SIO_GET_LATENCY_TIMER
#define FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE 0xC0
/*
* BmRequestType: 1100 0000b
* 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 slave
* 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 16ms.
*/
#define FTDI_SIO_SET_LATENCY_TIMER_REQUEST FTDI_SIO_SET_LATENCY_TIMER
#define FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE 0x40
/*
* BmRequestType: 0100 0000b
* 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 40ms 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 0x40
/*
* BmRequestType: 0100 0000b
* 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 0000b
* 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 0xc0
#define FTDI_SIO_GET_MODEM_STATUS_REQUEST FTDI_SIO_GET_MODEM_STATUS
#define FTDI_SIO_CTS_MASK 0x10
#define FTDI_SIO_DSR_MASK 0x20
#define FTDI_SIO_RI_MASK 0x40
#define FTDI_SIO_RLSD_MASK 0x80
/*
* BmRequestType: 1100 0000b
* 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 0x40
#define FTDI_SIO_SET_BITMODE_REQUEST FTDI_SIO_SET_BITMODE
/* Possible bitmodes for FTDI_SIO_SET_BITMODE_REQUEST */
#define FTDI_SIO_BITMODE_RESET 0x00
#define FTDI_SIO_BITMODE_CBUS 0x20
/* FTDI_SIO_READ_PINS */
#define FTDI_SIO_READ_PINS_REQUEST_TYPE 0xc0
#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 0xc0
#define FTDI_SIO_READ_EEPROM_REQUEST FTDI_SIO_READ_EEPROM
#define FTDI_FTX_CBUS_MUX_GPIO 0x8
#define FTDI_FT232R_CBUS_MUX_GPIO 0xa
/* Descriptors returned by the device
*
* Device Descriptor
*
* Offset Field Size Value Description
* 0 bLength 1 0x12 Size of descriptor in bytes
* 1 bDescriptorType 1 0x01 DEVICE Descriptor Type
* 2 bcdUSB 2 0x0110 USB Spec Release Number
* 4 bDeviceClass 1 0x00 Class Code
* 5 bDeviceSubClass 1 0x00 SubClass Code
* 6 bDeviceProtocol 1 0x00 Protocol Code
* 7 bMaxPacketSize0 1 0x08 Maximum packet size for endpoint 0
* 8 idVendor 2 0x0403 Vendor ID
* 10 idProduct 2 0x8372 Product ID (FTDI_SIO_PID)
* 12 bcdDevice 2 0x0001 Device release number
* 14 iManufacturer 1 0x01 Index of man. string desc
* 15 iProduct 1 0x02 Index of prod string desc
* 16 iSerialNumber 1 0x02 Index of serial nmr string desc
* 17 bNumConfigurations 1 0x01 Number of possible configurations
*
* Configuration Descriptor
*
* Offset Field Size Value
* 0 bLength 1 0x09 Size of descriptor in bytes
* 1 bDescriptorType 1 0x02 CONFIGURATION Descriptor Type
* 2 wTotalLength 2 0x0020 Total length of data
* 4 bNumInterfaces 1 0x01 Number of interfaces supported
* 5 bConfigurationValue 1 0x01 Argument for SetCOnfiguration() req
* 6 iConfiguration 1 0x02 Index of config string descriptor
* 7 bmAttributes 1 0x20 Config characteristics Remote Wakeup
* 8 MaxPower 1 0x1E Max power consumption
*
* Interface Descriptor
*
* Offset Field Size Value
* 0 bLength 1 0x09 Size of descriptor in bytes
* 1 bDescriptorType 1 0x04 INTERFACE Descriptor Type
* 2 bInterfaceNumber 1 0x00 Number of interface
* 3 bAlternateSetting 1 0x00 Value used to select alternate
* 4 bNumEndpoints 1 0x02 Number of endpoints
* 5 bInterfaceClass 1 0xFF Class Code
* 6 bInterfaceSubClass 1 0xFF Subclass Code
* 7 bInterfaceProtocol 1 0xFF Protocol Code
* 8 iInterface 1 0x02 Index of interface string description
*
* IN Endpoint Descriptor
*
* Offset Field Size Value
* 0 bLength 1 0x07 Size of descriptor in bytes
* 1 bDescriptorType 1 0x05 ENDPOINT descriptor type
* 2 bEndpointAddress 1 0x82 Address of endpoint
* 3 bmAttributes 1 0x02 Endpoint attributes - Bulk
* 4 bNumEndpoints 2 0x0040 maximum packet size
* 5 bInterval 1 0x00 Interval for polling endpoint
*
* OUT Endpoint Descriptor
*
* Offset Field Size Value
* 0 bLength 1 0x07 Size of descriptor in bytes
* 1 bDescriptorType 1 0x05 ENDPOINT descriptor type
* 2 bEndpointAddress 1 0x02 Address of endpoint
* 3 bmAttributes 1 0x02 Endpoint attributes - Bulk
* 4 bNumEndpoints 2 0x0040 maximum packet size
* 5 bInterval 1 0x00 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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