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Diffstat (limited to 'drivers/usb/serial/io_ionsp.h')
| -rw-r--r-- | drivers/usb/serial/io_ionsp.h | 451 |
1 files changed, 451 insertions, 0 deletions
diff --git a/drivers/usb/serial/io_ionsp.h b/drivers/usb/serial/io_ionsp.h new file mode 100644 index 000000000..db4fce815 --- /dev/null +++ b/drivers/usb/serial/io_ionsp.h @@ -0,0 +1,451 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/************************************************************************ + * + * IONSP.H Definitions for I/O Networks Serial Protocol + * + * Copyright (C) 1997-1998 Inside Out Networks, Inc. + * + * These definitions are used by both kernel-mode driver and the + * peripheral firmware and MUST be kept in sync. + * + ************************************************************************/ + +/************************************************************************ + +The data to and from all ports on the peripheral is multiplexed +through a single endpoint pair (EP1 since it supports 64-byte +MaxPacketSize). Therefore, the data, commands, and status for +each port must be preceded by a short header identifying the +destination port. The header also identifies the bytes that follow +as data or as command/status info. + +Header format, first byte: + + CLLLLPPP + -------- + | | |------ Port Number: 0-7 + | |--------- Length: MSB bits of length + |----------- Data/Command: 0 = Data header + 1 = Cmd / Status (Cmd if OUT, Status if IN) + +This gives 2 possible formats: + + + Data header: 0LLLLPPP LLLLLLLL + ============ + + Where (LLLL,LLLLLLL) is 12-bit length of data that follows for + port number (PPP). The length is 0-based (0-FFF means 0-4095 + bytes). The ~4K limit allows the host driver (which deals in + transfer requests instead of individual packets) to write a + large chunk of data in a single request. Note, however, that + the length must always be <= the current TxCredits for a given + port due to buffering limitations on the peripheral. + + + Cmd/Status header: 1ccccPPP [ CCCCCCCC, Params ]... + ================== + + Where (cccc) or (cccc,CCCCCCCC) is the cmd or status identifier. + Frequently-used values are encoded as (cccc), longer ones using + (cccc,CCCCCCCC). Subsequent bytes are optional parameters and are + specific to the cmd or status code. This may include a length + for command and status codes that need variable-length parameters. + + +In addition, we use another interrupt pipe (endpoint) which the host polls +periodically for flow control information. The peripheral, when there has +been a change, sends the following 10-byte packet: + + RRRRRRRRRRRRRRRR + T0T0T0T0T0T0T0T0 + T1T1T1T1T1T1T1T1 + T2T2T2T2T2T2T2T2 + T3T3T3T3T3T3T3T3 + +The first field is the 16-bit RxBytesAvail field, which indicates the +number of bytes which may be read by the host from EP1. This is necessary: +(a) because OSR2.1 has a bug which causes data loss if the peripheral returns +fewer bytes than the host expects to read, and (b) because, on Microsoft +platforms at least, an outstanding read posted on EP1 consumes about 35% of +the CPU just polling the device for data. + +The next 4 fields are the 16-bit TxCredits for each port, which indicate how +many bytes the host is allowed to send on EP1 for transmit to a given port. +After an OPEN_PORT command, the Edgeport sends the initial TxCredits for that +port. + +All 16-bit fields are sent in little-endian (Intel) format. + +************************************************************************/ + +// +// Define format of InterruptStatus packet returned from the +// Interrupt pipe +// + +struct int_status_pkt { + __u16 RxBytesAvail; // Additional bytes available to + // be read from Bulk IN pipe + __u16 TxCredits[MAX_RS232_PORTS]; // Additional space available in + // given port's TxBuffer +}; + + +#define GET_INT_STATUS_SIZE(NumPorts) (sizeof(__u16) + (sizeof(__u16) * (NumPorts))) + + + +// +// Define cmd/status header values and macros to extract them. +// +// Data: 0LLLLPPP LLLLLLLL +// Cmd/Stat: 1ccccPPP CCCCCCCC + +#define IOSP_DATA_HDR_SIZE 2 +#define IOSP_CMD_HDR_SIZE 2 + +#define IOSP_MAX_DATA_LENGTH 0x0FFF // 12 bits -> 4K + +#define IOSP_PORT_MASK 0x07 // Mask to isolate port number +#define IOSP_CMD_STAT_BIT 0x80 // If set, this is command/status header + +#define IS_CMD_STAT_HDR(Byte1) ((Byte1) & IOSP_CMD_STAT_BIT) +#define IS_DATA_HDR(Byte1) (!IS_CMD_STAT_HDR(Byte1)) + +#define IOSP_GET_HDR_PORT(Byte1) ((__u8) ((Byte1) & IOSP_PORT_MASK)) +#define IOSP_GET_HDR_DATA_LEN(Byte1, Byte2) ((__u16) (((__u16)((Byte1) & 0x78)) << 5) | (Byte2)) +#define IOSP_GET_STATUS_CODE(Byte1) ((__u8) (((Byte1) & 0x78) >> 3)) + + +// +// These macros build the 1st and 2nd bytes for a data header +// +#define IOSP_BUILD_DATA_HDR1(Port, Len) ((__u8) (((Port) | ((__u8) (((__u16) (Len)) >> 5) & 0x78)))) +#define IOSP_BUILD_DATA_HDR2(Port, Len) ((__u8) (Len)) + + +// +// These macros build the 1st and 2nd bytes for a command header +// +#define IOSP_BUILD_CMD_HDR1(Port, Cmd) ((__u8) (IOSP_CMD_STAT_BIT | (Port) | ((__u8) ((Cmd) << 3)))) + + +//-------------------------------------------------------------- +// +// Define values for commands and command parameters +// (sent from Host to Edgeport) +// +// 1ccccPPP P1P1P1P1 [ P2P2P2P2P2 ]... +// +// cccc: 00-07 2-byte commands. Write UART register 0-7 with +// value in P1. See 16650.H for definitions of +// UART register numbers and contents. +// +// 08-0B 3-byte commands: ==== P1 ==== ==== P2 ==== +// 08 available for expansion +// 09 1-param commands Command Code Param +// 0A available for expansion +// 0B available for expansion +// +// 0C-0D 4-byte commands. P1 = extended cmd and P2,P3 = params +// Currently unimplemented. +// +// 0E-0F N-byte commands: P1 = num bytes after P1 (ie, TotalLen - 2) +// P2 = extended cmd, P3..Pn = parameters. +// Currently unimplemented. +// + +#define IOSP_WRITE_UART_REG(n) ((n) & 0x07) // UartReg[ n ] := P1 + +// Register numbers and contents +// defined in 16554.H. + +// 0x08 // Available for expansion. +#define IOSP_EXT_CMD 0x09 // P1 = Command code (defined below) + +// P2 = Parameter + +// +// Extended Command values, used with IOSP_EXT_CMD, may +// or may not use parameter P2. +// + +#define IOSP_CMD_OPEN_PORT 0x00 // Enable ints, init UART. (NO PARAM) +#define IOSP_CMD_CLOSE_PORT 0x01 // Disable ints, flush buffers. (NO PARAM) +#define IOSP_CMD_CHASE_PORT 0x02 // Wait for Edgeport TX buffers to empty. (NO PARAM) +#define IOSP_CMD_SET_RX_FLOW 0x03 // Set Rx Flow Control in Edgeport +#define IOSP_CMD_SET_TX_FLOW 0x04 // Set Tx Flow Control in Edgeport +#define IOSP_CMD_SET_XON_CHAR 0x05 // Set XON Character in Edgeport +#define IOSP_CMD_SET_XOFF_CHAR 0x06 // Set XOFF Character in Edgeport +#define IOSP_CMD_RX_CHECK_REQ 0x07 // Request Edgeport to insert a Checkpoint into + +// the receive data stream (Parameter = 1 byte sequence number) + +#define IOSP_CMD_SET_BREAK 0x08 // Turn on the BREAK (LCR bit 6) +#define IOSP_CMD_CLEAR_BREAK 0x09 // Turn off the BREAK (LCR bit 6) + + +// +// Define macros to simplify building of IOSP cmds +// + +#define MAKE_CMD_WRITE_REG(ppBuf, pLen, Port, Reg, Val) \ +do { \ + (*(ppBuf))[0] = IOSP_BUILD_CMD_HDR1((Port), \ + IOSP_WRITE_UART_REG(Reg)); \ + (*(ppBuf))[1] = (Val); \ + \ + *ppBuf += 2; \ + *pLen += 2; \ +} while (0) + +#define MAKE_CMD_EXT_CMD(ppBuf, pLen, Port, ExtCmd, Param) \ +do { \ + (*(ppBuf))[0] = IOSP_BUILD_CMD_HDR1((Port), IOSP_EXT_CMD); \ + (*(ppBuf))[1] = (ExtCmd); \ + (*(ppBuf))[2] = (Param); \ + \ + *ppBuf += 3; \ + *pLen += 3; \ +} while (0) + + + +//-------------------------------------------------------------- +// +// Define format of flow control commands +// (sent from Host to Edgeport) +// +// 11001PPP FlowCmd FlowTypes +// +// Note that the 'FlowTypes' parameter is a bit mask; that is, +// more than one flow control type can be active at the same time. +// FlowTypes = 0 means 'no flow control'. +// + +// +// IOSP_CMD_SET_RX_FLOW +// +// Tells Edgeport how it can stop incoming UART data +// +// Example for Port 0 +// P0 = 11001000 +// P1 = IOSP_CMD_SET_RX_FLOW +// P2 = Bit mask as follows: + +#define IOSP_RX_FLOW_RTS 0x01 // Edgeport drops RTS to stop incoming data +#define IOSP_RX_FLOW_DTR 0x02 // Edgeport drops DTR to stop incoming data +#define IOSP_RX_FLOW_DSR_SENSITIVITY 0x04 // Ignores Rx data unless DSR high + +// Not currently implemented by firmware. +#define IOSP_RX_FLOW_XON_XOFF 0x08 // Edgeport sends XOFF char to stop incoming data. + +// Host must have previously programmed the +// XON/XOFF values with SET_XON/SET_XOFF +// before enabling this bit. + +// +// IOSP_CMD_SET_TX_FLOW +// +// Tells Edgeport what signal(s) will stop it from transmitting UART data +// +// Example for Port 0 +// P0 = 11001000 +// P1 = IOSP_CMD_SET_TX_FLOW +// P2 = Bit mask as follows: + +#define IOSP_TX_FLOW_CTS 0x01 // Edgeport stops Tx if CTS low +#define IOSP_TX_FLOW_DSR 0x02 // Edgeport stops Tx if DSR low +#define IOSP_TX_FLOW_DCD 0x04 // Edgeport stops Tx if DCD low +#define IOSP_TX_FLOW_XON_XOFF 0x08 // Edgeport stops Tx upon receiving XOFF char. + +// Host must have previously programmed the +// XON/XOFF values with SET_XON/SET_XOFF +// before enabling this bit. +#define IOSP_TX_FLOW_XOFF_CONTINUE 0x10 // If not set, Edgeport stops Tx when + +// sending XOFF in order to fix broken +// systems that interpret the next +// received char as XON. +// If set, Edgeport continues Tx +// normally after transmitting XOFF. +// Not currently implemented by firmware. +#define IOSP_TX_TOGGLE_RTS 0x20 // Edgeport drives RTS as a true half-duplex + +// Request-to-Send signal: it is raised before +// beginning transmission and lowered after +// the last Tx char leaves the UART. +// Not currently implemented by firmware. + +// +// IOSP_CMD_SET_XON_CHAR +// +// Sets the character which Edgeport transmits/interprets as XON. +// Note: This command MUST be sent before sending a SET_RX_FLOW or +// SET_TX_FLOW with the XON_XOFF bit set. +// +// Example for Port 0 +// P0 = 11001000 +// P1 = IOSP_CMD_SET_XON_CHAR +// P2 = 0x11 + + +// +// IOSP_CMD_SET_XOFF_CHAR +// +// Sets the character which Edgeport transmits/interprets as XOFF. +// Note: This command must be sent before sending a SET_RX_FLOW or +// SET_TX_FLOW with the XON_XOFF bit set. +// +// Example for Port 0 +// P0 = 11001000 +// P1 = IOSP_CMD_SET_XOFF_CHAR +// P2 = 0x13 + + +// +// IOSP_CMD_RX_CHECK_REQ +// +// This command is used to assist in the implementation of the +// IOCTL_SERIAL_PURGE Windows IOCTL. +// This IOSP command tries to place a marker at the end of the RX +// queue in the Edgeport. If the Edgeport RX queue is full then +// the Check will be discarded. +// It is up to the device driver to timeout waiting for the +// RX_CHECK_RSP. If a RX_CHECK_RSP is received, the driver is +// sure that all data has been received from the edgeport and +// may now purge any internal RX buffers. +// Note tat the sequence numbers may be used to detect lost +// CHECK_REQs. + +// Example for Port 0 +// P0 = 11001000 +// P1 = IOSP_CMD_RX_CHECK_REQ +// P2 = Sequence number + + +// Response will be: +// P1 = IOSP_EXT_RX_CHECK_RSP +// P2 = Request Sequence number + + + +//-------------------------------------------------------------- +// +// Define values for status and status parameters +// (received by Host from Edgeport) +// +// 1ssssPPP P1P1P1P1 [ P2P2P2P2P2 ]... +// +// ssss: 00-07 2-byte status. ssss identifies which UART register +// has changed value, and the new value is in P1. +// Note that the ssss values do not correspond to the +// 16554 register numbers given in 16554.H. Instead, +// see below for definitions of the ssss numbers +// used in this status message. +// +// 08-0B 3-byte status: ==== P1 ==== ==== P2 ==== +// 08 LSR_DATA: New LSR Errored byte +// 09 1-param responses Response Code Param +// 0A OPEN_RSP: InitialMsr TxBufferSize +// 0B available for expansion +// +// 0C-0D 4-byte status. P1 = extended status code and P2,P3 = params +// Not currently implemented. +// +// 0E-0F N-byte status: P1 = num bytes after P1 (ie, TotalLen - 2) +// P2 = extended status, P3..Pn = parameters. +// Not currently implemented. +// + +/**************************************************** + * SSSS values for 2-byte status messages (0-8) + ****************************************************/ + +#define IOSP_STATUS_LSR 0x00 // P1 is new value of LSR register. + +// Bits defined in 16554.H. Edgeport +// returns this in order to report +// line status errors (overrun, +// parity, framing, break). This form +// is used when a errored receive data +// character was NOT present in the +// UART when the LSR error occurred +// (ie, when LSR bit 0 = 0). + +#define IOSP_STATUS_MSR 0x01 // P1 is new value of MSR register. + +// Bits defined in 16554.H. Edgeport +// returns this in order to report +// changes in modem status lines +// (CTS, DSR, RI, CD) +// + +// 0x02 // Available for future expansion +// 0x03 // +// 0x04 // +// 0x05 // +// 0x06 // +// 0x07 // + + +/**************************************************** + * SSSS values for 3-byte status messages (8-A) + ****************************************************/ + +#define IOSP_STATUS_LSR_DATA 0x08 // P1 is new value of LSR register (same as STATUS_LSR) + +// P2 is errored character read from +// RxFIFO after LSR reported an error. + +#define IOSP_EXT_STATUS 0x09 // P1 is status/response code, param in P2. + + +// Response Codes (P1 values) for 3-byte status messages + +#define IOSP_EXT_STATUS_CHASE_RSP 0 // Reply to CHASE_PORT cmd. P2 is outcome: +#define IOSP_EXT_STATUS_CHASE_PASS 0 // P2 = 0: All Tx data drained successfully +#define IOSP_EXT_STATUS_CHASE_FAIL 1 // P2 = 1: Timed out (stuck due to flow + +// control from remote device). + +#define IOSP_EXT_STATUS_RX_CHECK_RSP 1 // Reply to RX_CHECK cmd. P2 is sequence number + + +#define IOSP_STATUS_OPEN_RSP 0x0A // Reply to OPEN_PORT cmd. + +// P1 is Initial MSR value +// P2 is encoded TxBuffer Size: +// TxBufferSize = (P2 + 1) * 64 + +// 0x0B // Available for future expansion + +#define GET_TX_BUFFER_SIZE(P2) (((P2) + 1) * 64) + + + + +/**************************************************** + * SSSS values for 4-byte status messages + ****************************************************/ + +#define IOSP_EXT4_STATUS 0x0C // Extended status code in P1, + +// Params in P2, P3 +// Currently unimplemented. + +// 0x0D // Currently unused, available. + + + +// +// Macros to parse status messages +// + +#define IOSP_GET_STATUS_LEN(code) ((code) < 8 ? 2 : ((code) < 0x0A ? 3 : 4)) + +#define IOSP_STATUS_IS_2BYTE(code) ((code) < 0x08) +#define IOSP_STATUS_IS_3BYTE(code) (((code) >= 0x08) && ((code) <= 0x0B)) +#define IOSP_STATUS_IS_4BYTE(code) (((code) >= 0x0C) && ((code) <= 0x0D)) + |