1 /* 2 * Driver definitions for the FTDI USB Single Port Serial Converter - 3 * known as FTDI_SIO (Serial Input/Output application of the chipset) 4 * 5 * For USB vendor/product IDs (VID/PID), please see ftdi_sio_ids.h 6 * 7 * 8 * The example I have is known as the USC-1000 which is available from 9 * http://www.dse.co.nz - cat no XH4214 It looks similar to this: 10 * http://www.dansdata.com/usbser.htm but I can't be sure There are other 11 * USC-1000s which don't look like my device though so beware! 12 * 13 * The device is based on the FTDI FT8U100AX chip. It has a DB25 on one side, 14 * USB on the other. 15 * 16 * Thanx to FTDI (http://www.ftdichip.com) for so kindly providing details 17 * of the protocol required to talk to the device and ongoing assistence 18 * during development. 19 * 20 * Bill Ryder - bryder@sgi.com formerly of Silicon Graphics, Inc.- wrote the 21 * FTDI_SIO implementation. 22 * 23 */ 24 25 /* Commands */ 26 #define FTDI_SIO_RESET 0 /* Reset the port */ 27 #define FTDI_SIO_MODEM_CTRL 1 /* Set the modem control register */ 28 #define FTDI_SIO_SET_FLOW_CTRL 2 /* Set flow control register */ 29 #define FTDI_SIO_SET_BAUD_RATE 3 /* Set baud rate */ 30 #define FTDI_SIO_SET_DATA 4 /* Set the data characteristics of 31 the port */ 32 #define FTDI_SIO_GET_MODEM_STATUS 5 /* Retrieve current value of modem 33 status register */ 34 #define FTDI_SIO_SET_EVENT_CHAR 6 /* Set the event character */ 35 #define FTDI_SIO_SET_ERROR_CHAR 7 /* Set the error character */ 36 #define FTDI_SIO_SET_LATENCY_TIMER 9 /* Set the latency timer */ 37 #define FTDI_SIO_GET_LATENCY_TIMER 10 /* Get the latency timer */ 38 39 /* Interface indices for FT2232, FT2232H and FT4232H devices */ 40 #define INTERFACE_A 1 41 #define INTERFACE_B 2 42 #define INTERFACE_C 3 43 #define INTERFACE_D 4 44 45 46 /* 47 * BmRequestType: 1100 0000b 48 * bRequest: FTDI_E2_READ 49 * wValue: 0 50 * wIndex: Address of word to read 51 * wLength: 2 52 * Data: Will return a word of data from E2Address 53 * 54 */ 55 56 /* Port Identifier Table */ 57 #define PIT_DEFAULT 0 /* SIOA */ 58 #define PIT_SIOA 1 /* SIOA */ 59 /* The device this driver is tested with one has only one port */ 60 #define PIT_SIOB 2 /* SIOB */ 61 #define PIT_PARALLEL 3 /* Parallel */ 62 63 /* FTDI_SIO_RESET */ 64 #define FTDI_SIO_RESET_REQUEST FTDI_SIO_RESET 65 #define FTDI_SIO_RESET_REQUEST_TYPE 0x40 66 #define FTDI_SIO_RESET_SIO 0 67 #define FTDI_SIO_RESET_PURGE_RX 1 68 #define FTDI_SIO_RESET_PURGE_TX 2 69 70 /* 71 * BmRequestType: 0100 0000B 72 * bRequest: FTDI_SIO_RESET 73 * wValue: Control Value 74 * 0 = Reset SIO 75 * 1 = Purge RX buffer 76 * 2 = Purge TX buffer 77 * wIndex: Port 78 * wLength: 0 79 * Data: None 80 * 81 * The Reset SIO command has this effect: 82 * 83 * Sets flow control set to 'none' 84 * Event char = $0D 85 * Event trigger = disabled 86 * Purge RX buffer 87 * Purge TX buffer 88 * Clear DTR 89 * Clear RTS 90 * baud and data format not reset 91 * 92 * The Purge RX and TX buffer commands affect nothing except the buffers 93 * 94 */ 95 96 /* FTDI_SIO_SET_BAUDRATE */ 97 #define FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE 0x40 98 #define FTDI_SIO_SET_BAUDRATE_REQUEST 3 99 100 /* 101 * BmRequestType: 0100 0000B 102 * bRequest: FTDI_SIO_SET_BAUDRATE 103 * wValue: BaudDivisor value - see below 104 * wIndex: Port 105 * wLength: 0 106 * Data: None 107 * The BaudDivisor values are calculated as follows: 108 * - BaseClock is either 12000000 or 48000000 depending on the device. 109 * FIXME: I wish I knew how to detect old chips to select proper base clock! 110 * - BaudDivisor is a fixed point number encoded in a funny way. 111 * (--WRONG WAY OF THINKING--) 112 * BaudDivisor is a fixed point number encoded with following bit weighs: 113 * (-2)(-1)(13..0). It is a radical with a denominator of 4, so values 114 * end with 0.0 (00...), 0.25 (10...), 0.5 (01...), and 0.75 (11...). 115 * (--THE REALITY--) 116 * The both-bits-set has quite different meaning from 0.75 - the chip 117 * designers have decided it to mean 0.125 instead of 0.75. 118 * This info looked up in FTDI application note "FT8U232 DEVICES \ Data Rates 119 * and Flow Control Consideration for USB to RS232". 120 * - BaudDivisor = (BaseClock / 16) / BaudRate, where the (=) operation should 121 * automagically re-encode the resulting value to take fractions into 122 * consideration. 123 * As all values are integers, some bit twiddling is in order: 124 * BaudDivisor = (BaseClock / 16 / BaudRate) | 125 * (((BaseClock / 2 / BaudRate) & 4) ? 0x4000 // 0.5 126 * : ((BaseClock / 2 / BaudRate) & 2) ? 0x8000 // 0.25 127 * : ((BaseClock / 2 / BaudRate) & 1) ? 0xc000 // 0.125 128 * : 0) 129 * 130 * For the FT232BM, a 17th divisor bit was introduced to encode the multiples 131 * of 0.125 missing from the FT8U232AM. Bits 16 to 14 are coded as follows 132 * (the first four codes are the same as for the FT8U232AM, where bit 16 is 133 * always 0): 134 * 000 - add .000 to divisor 135 * 001 - add .500 to divisor 136 * 010 - add .250 to divisor 137 * 011 - add .125 to divisor 138 * 100 - add .375 to divisor 139 * 101 - add .625 to divisor 140 * 110 - add .750 to divisor 141 * 111 - add .875 to divisor 142 * Bits 15 to 0 of the 17-bit divisor are placed in the urb value. Bit 16 is 143 * placed in bit 0 of the urb index. 144 * 145 * Note that there are a couple of special cases to support the highest baud 146 * rates. If the calculated divisor value is 1, this needs to be replaced with 147 * 0. Additionally for the FT232BM, if the calculated divisor value is 0x4001 148 * (1.5), this needs to be replaced with 0x0001 (1) (but this divisor value is 149 * not supported by the FT8U232AM). 150 */ 151 152 enum ftdi_chip_type { 153 SIO = 1, 154 FT8U232AM = 2, 155 FT232BM = 3, 156 FT2232C = 4, 157 FT232RL = 5, 158 FT2232H = 6, 159 FT4232H = 7, 160 FT232H = 8, 161 FTX = 9, 162 }; 163 164 enum ftdi_sio_baudrate { 165 ftdi_sio_b300 = 0, 166 ftdi_sio_b600 = 1, 167 ftdi_sio_b1200 = 2, 168 ftdi_sio_b2400 = 3, 169 ftdi_sio_b4800 = 4, 170 ftdi_sio_b9600 = 5, 171 ftdi_sio_b19200 = 6, 172 ftdi_sio_b38400 = 7, 173 ftdi_sio_b57600 = 8, 174 ftdi_sio_b115200 = 9 175 }; 176 177 /* 178 * The ftdi_8U232AM_xxMHz_byyy constants have been removed. The encoded divisor 179 * values are calculated internally. 180 */ 181 #define FTDI_SIO_SET_DATA_REQUEST FTDI_SIO_SET_DATA 182 #define FTDI_SIO_SET_DATA_REQUEST_TYPE 0x40 183 #define FTDI_SIO_SET_DATA_PARITY_NONE (0x0 << 8) 184 #define FTDI_SIO_SET_DATA_PARITY_ODD (0x1 << 8) 185 #define FTDI_SIO_SET_DATA_PARITY_EVEN (0x2 << 8) 186 #define FTDI_SIO_SET_DATA_PARITY_MARK (0x3 << 8) 187 #define FTDI_SIO_SET_DATA_PARITY_SPACE (0x4 << 8) 188 #define FTDI_SIO_SET_DATA_STOP_BITS_1 (0x0 << 11) 189 #define FTDI_SIO_SET_DATA_STOP_BITS_15 (0x1 << 11) 190 #define FTDI_SIO_SET_DATA_STOP_BITS_2 (0x2 << 11) 191 #define FTDI_SIO_SET_BREAK (0x1 << 14) 192 /* FTDI_SIO_SET_DATA */ 193 194 /* 195 * BmRequestType: 0100 0000B 196 * bRequest: FTDI_SIO_SET_DATA 197 * wValue: Data characteristics (see below) 198 * wIndex: Port 199 * wLength: 0 200 * Data: No 201 * 202 * Data characteristics 203 * 204 * B0..7 Number of data bits 205 * B8..10 Parity 206 * 0 = None 207 * 1 = Odd 208 * 2 = Even 209 * 3 = Mark 210 * 4 = Space 211 * B11..13 Stop Bits 212 * 0 = 1 213 * 1 = 1.5 214 * 2 = 2 215 * B14 216 * 1 = TX ON (break) 217 * 0 = TX OFF (normal state) 218 * B15 Reserved 219 * 220 */ 221 222 223 224 /* FTDI_SIO_MODEM_CTRL */ 225 #define FTDI_SIO_SET_MODEM_CTRL_REQUEST_TYPE 0x40 226 #define FTDI_SIO_SET_MODEM_CTRL_REQUEST FTDI_SIO_MODEM_CTRL 227 228 /* 229 * BmRequestType: 0100 0000B 230 * bRequest: FTDI_SIO_MODEM_CTRL 231 * wValue: ControlValue (see below) 232 * wIndex: Port 233 * wLength: 0 234 * Data: None 235 * 236 * NOTE: If the device is in RTS/CTS flow control, the RTS set by this 237 * command will be IGNORED without an error being returned 238 * Also - you can not set DTR and RTS with one control message 239 */ 240 241 #define FTDI_SIO_SET_DTR_MASK 0x1 242 #define FTDI_SIO_SET_DTR_HIGH (1 | (FTDI_SIO_SET_DTR_MASK << 8)) 243 #define FTDI_SIO_SET_DTR_LOW (0 | (FTDI_SIO_SET_DTR_MASK << 8)) 244 #define FTDI_SIO_SET_RTS_MASK 0x2 245 #define FTDI_SIO_SET_RTS_HIGH (2 | (FTDI_SIO_SET_RTS_MASK << 8)) 246 #define FTDI_SIO_SET_RTS_LOW (0 | (FTDI_SIO_SET_RTS_MASK << 8)) 247 248 /* 249 * ControlValue 250 * B0 DTR state 251 * 0 = reset 252 * 1 = set 253 * B1 RTS state 254 * 0 = reset 255 * 1 = set 256 * B2..7 Reserved 257 * B8 DTR state enable 258 * 0 = ignore 259 * 1 = use DTR state 260 * B9 RTS state enable 261 * 0 = ignore 262 * 1 = use RTS state 263 * B10..15 Reserved 264 */ 265 266 /* FTDI_SIO_SET_FLOW_CTRL */ 267 #define FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE 0x40 268 #define FTDI_SIO_SET_FLOW_CTRL_REQUEST FTDI_SIO_SET_FLOW_CTRL 269 #define FTDI_SIO_DISABLE_FLOW_CTRL 0x0 270 #define FTDI_SIO_RTS_CTS_HS (0x1 << 8) 271 #define FTDI_SIO_DTR_DSR_HS (0x2 << 8) 272 #define FTDI_SIO_XON_XOFF_HS (0x4 << 8) 273 /* 274 * BmRequestType: 0100 0000b 275 * bRequest: FTDI_SIO_SET_FLOW_CTRL 276 * wValue: Xoff/Xon 277 * wIndex: Protocol/Port - hIndex is protocol / lIndex is port 278 * wLength: 0 279 * Data: None 280 * 281 * hIndex protocol is: 282 * B0 Output handshaking using RTS/CTS 283 * 0 = disabled 284 * 1 = enabled 285 * B1 Output handshaking using DTR/DSR 286 * 0 = disabled 287 * 1 = enabled 288 * B2 Xon/Xoff handshaking 289 * 0 = disabled 290 * 1 = enabled 291 * 292 * A value of zero in the hIndex field disables handshaking 293 * 294 * If Xon/Xoff handshaking is specified, the hValue field should contain the 295 * XOFF character and the lValue field contains the XON character. 296 */ 297 298 /* 299 * FTDI_SIO_GET_LATENCY_TIMER 300 * 301 * Set the timeout interval. The FTDI collects data from the slave 302 * device, transmitting it to the host when either A) 62 bytes are 303 * received, or B) the timeout interval has elapsed and the buffer 304 * contains at least 1 byte. Setting this value to a small number 305 * can dramatically improve performance for applications which send 306 * small packets, since the default value is 16ms. 307 */ 308 #define FTDI_SIO_GET_LATENCY_TIMER_REQUEST FTDI_SIO_GET_LATENCY_TIMER 309 #define FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE 0xC0 310 311 /* 312 * BmRequestType: 1100 0000b 313 * bRequest: FTDI_SIO_GET_LATENCY_TIMER 314 * wValue: 0 315 * wIndex: Port 316 * wLength: 0 317 * Data: latency (on return) 318 */ 319 320 /* 321 * FTDI_SIO_SET_LATENCY_TIMER 322 * 323 * Set the timeout interval. The FTDI collects data from the slave 324 * device, transmitting it to the host when either A) 62 bytes are 325 * received, or B) the timeout interval has elapsed and the buffer 326 * contains at least 1 byte. Setting this value to a small number 327 * can dramatically improve performance for applications which send 328 * small packets, since the default value is 16ms. 329 */ 330 #define FTDI_SIO_SET_LATENCY_TIMER_REQUEST FTDI_SIO_SET_LATENCY_TIMER 331 #define FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE 0x40 332 333 /* 334 * BmRequestType: 0100 0000b 335 * bRequest: FTDI_SIO_SET_LATENCY_TIMER 336 * wValue: Latency (milliseconds) 337 * wIndex: Port 338 * wLength: 0 339 * Data: None 340 * 341 * wValue: 342 * B0..7 Latency timer 343 * B8..15 0 344 * 345 */ 346 347 /* 348 * FTDI_SIO_SET_EVENT_CHAR 349 * 350 * Set the special event character for the specified communications port. 351 * If the device sees this character it will immediately return the 352 * data read so far - rather than wait 40ms or until 62 bytes are read 353 * which is what normally happens. 354 */ 355 356 357 #define FTDI_SIO_SET_EVENT_CHAR_REQUEST FTDI_SIO_SET_EVENT_CHAR 358 #define FTDI_SIO_SET_EVENT_CHAR_REQUEST_TYPE 0x40 359 360 361 /* 362 * BmRequestType: 0100 0000b 363 * bRequest: FTDI_SIO_SET_EVENT_CHAR 364 * wValue: EventChar 365 * wIndex: Port 366 * wLength: 0 367 * Data: None 368 * 369 * wValue: 370 * B0..7 Event Character 371 * B8 Event Character Processing 372 * 0 = disabled 373 * 1 = enabled 374 * B9..15 Reserved 375 * 376 */ 377 378 /* FTDI_SIO_SET_ERROR_CHAR */ 379 380 /* 381 * Set the parity error replacement character for the specified communications 382 * port 383 */ 384 385 /* 386 * BmRequestType: 0100 0000b 387 * bRequest: FTDI_SIO_SET_EVENT_CHAR 388 * wValue: Error Char 389 * wIndex: Port 390 * wLength: 0 391 * Data: None 392 * 393 *Error Char 394 * B0..7 Error Character 395 * B8 Error Character Processing 396 * 0 = disabled 397 * 1 = enabled 398 * B9..15 Reserved 399 * 400 */ 401 402 /* FTDI_SIO_GET_MODEM_STATUS */ 403 /* Retrieve the current value of the modem status register */ 404 405 #define FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE 0xc0 406 #define FTDI_SIO_GET_MODEM_STATUS_REQUEST FTDI_SIO_GET_MODEM_STATUS 407 #define FTDI_SIO_CTS_MASK 0x10 408 #define FTDI_SIO_DSR_MASK 0x20 409 #define FTDI_SIO_RI_MASK 0x40 410 #define FTDI_SIO_RLSD_MASK 0x80 411 /* 412 * BmRequestType: 1100 0000b 413 * bRequest: FTDI_SIO_GET_MODEM_STATUS 414 * wValue: zero 415 * wIndex: Port 416 * wLength: 1 417 * Data: Status 418 * 419 * One byte of data is returned 420 * B0..3 0 421 * B4 CTS 422 * 0 = inactive 423 * 1 = active 424 * B5 DSR 425 * 0 = inactive 426 * 1 = active 427 * B6 Ring Indicator (RI) 428 * 0 = inactive 429 * 1 = active 430 * B7 Receive Line Signal Detect (RLSD) 431 * 0 = inactive 432 * 1 = active 433 */ 434 435 436 437 /* Descriptors returned by the device 438 * 439 * Device Descriptor 440 * 441 * Offset Field Size Value Description 442 * 0 bLength 1 0x12 Size of descriptor in bytes 443 * 1 bDescriptorType 1 0x01 DEVICE Descriptor Type 444 * 2 bcdUSB 2 0x0110 USB Spec Release Number 445 * 4 bDeviceClass 1 0x00 Class Code 446 * 5 bDeviceSubClass 1 0x00 SubClass Code 447 * 6 bDeviceProtocol 1 0x00 Protocol Code 448 * 7 bMaxPacketSize0 1 0x08 Maximum packet size for endpoint 0 449 * 8 idVendor 2 0x0403 Vendor ID 450 * 10 idProduct 2 0x8372 Product ID (FTDI_SIO_PID) 451 * 12 bcdDevice 2 0x0001 Device release number 452 * 14 iManufacturer 1 0x01 Index of man. string desc 453 * 15 iProduct 1 0x02 Index of prod string desc 454 * 16 iSerialNumber 1 0x02 Index of serial nmr string desc 455 * 17 bNumConfigurations 1 0x01 Number of possible configurations 456 * 457 * Configuration Descriptor 458 * 459 * Offset Field Size Value 460 * 0 bLength 1 0x09 Size of descriptor in bytes 461 * 1 bDescriptorType 1 0x02 CONFIGURATION Descriptor Type 462 * 2 wTotalLength 2 0x0020 Total length of data 463 * 4 bNumInterfaces 1 0x01 Number of interfaces supported 464 * 5 bConfigurationValue 1 0x01 Argument for SetCOnfiguration() req 465 * 6 iConfiguration 1 0x02 Index of config string descriptor 466 * 7 bmAttributes 1 0x20 Config characteristics Remote Wakeup 467 * 8 MaxPower 1 0x1E Max power consumption 468 * 469 * Interface Descriptor 470 * 471 * Offset Field Size Value 472 * 0 bLength 1 0x09 Size of descriptor in bytes 473 * 1 bDescriptorType 1 0x04 INTERFACE Descriptor Type 474 * 2 bInterfaceNumber 1 0x00 Number of interface 475 * 3 bAlternateSetting 1 0x00 Value used to select alternate 476 * 4 bNumEndpoints 1 0x02 Number of endpoints 477 * 5 bInterfaceClass 1 0xFF Class Code 478 * 6 bInterfaceSubClass 1 0xFF Subclass Code 479 * 7 bInterfaceProtocol 1 0xFF Protocol Code 480 * 8 iInterface 1 0x02 Index of interface string description 481 * 482 * IN Endpoint Descriptor 483 * 484 * Offset Field Size Value 485 * 0 bLength 1 0x07 Size of descriptor in bytes 486 * 1 bDescriptorType 1 0x05 ENDPOINT descriptor type 487 * 2 bEndpointAddress 1 0x82 Address of endpoint 488 * 3 bmAttributes 1 0x02 Endpoint attributes - Bulk 489 * 4 bNumEndpoints 2 0x0040 maximum packet size 490 * 5 bInterval 1 0x00 Interval for polling endpoint 491 * 492 * OUT Endpoint Descriptor 493 * 494 * Offset Field Size Value 495 * 0 bLength 1 0x07 Size of descriptor in bytes 496 * 1 bDescriptorType 1 0x05 ENDPOINT descriptor type 497 * 2 bEndpointAddress 1 0x02 Address of endpoint 498 * 3 bmAttributes 1 0x02 Endpoint attributes - Bulk 499 * 4 bNumEndpoints 2 0x0040 maximum packet size 500 * 5 bInterval 1 0x00 Interval for polling endpoint 501 * 502 * DATA FORMAT 503 * 504 * IN Endpoint 505 * 506 * The device reserves the first two bytes of data on this endpoint to contain 507 * the current values of the modem and line status registers. In the absence of 508 * data, the device generates a message consisting of these two status bytes 509 * every 40 ms 510 * 511 * Byte 0: Modem Status 512 * 513 * Offset Description 514 * B0 Reserved - must be 1 515 * B1 Reserved - must be 0 516 * B2 Reserved - must be 0 517 * B3 Reserved - must be 0 518 * B4 Clear to Send (CTS) 519 * B5 Data Set Ready (DSR) 520 * B6 Ring Indicator (RI) 521 * B7 Receive Line Signal Detect (RLSD) 522 * 523 * Byte 1: Line Status 524 * 525 * Offset Description 526 * B0 Data Ready (DR) 527 * B1 Overrun Error (OE) 528 * B2 Parity Error (PE) 529 * B3 Framing Error (FE) 530 * B4 Break Interrupt (BI) 531 * B5 Transmitter Holding Register (THRE) 532 * B6 Transmitter Empty (TEMT) 533 * B7 Error in RCVR FIFO 534 * 535 */ 536 #define FTDI_RS0_CTS (1 << 4) 537 #define FTDI_RS0_DSR (1 << 5) 538 #define FTDI_RS0_RI (1 << 6) 539 #define FTDI_RS0_RLSD (1 << 7) 540 541 #define FTDI_RS_DR 1 542 #define FTDI_RS_OE (1<<1) 543 #define FTDI_RS_PE (1<<2) 544 #define FTDI_RS_FE (1<<3) 545 #define FTDI_RS_BI (1<<4) 546 #define FTDI_RS_THRE (1<<5) 547 #define FTDI_RS_TEMT (1<<6) 548 #define FTDI_RS_FIFO (1<<7) 549 550 /* 551 * OUT Endpoint 552 * 553 * This device reserves the first bytes of data on this endpoint contain the 554 * length and port identifier of the message. For the FTDI USB Serial converter 555 * the port identifier is always 1. 556 * 557 * Byte 0: Line Status 558 * 559 * Offset Description 560 * B0 Reserved - must be 1 561 * B1 Reserved - must be 0 562 * B2..7 Length of message - (not including Byte 0) 563 * 564 */ 565