1 /*- 2 * Copyright (c) 2010 Lev Serebryakov <lev@FreeBSD.org>. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 /* 28 * This driver supports several multiport USB-to-RS232 serial adapters driven 29 * by MosChip mos7820 and mos7840, bridge chips. 30 * The adapters are sold under many different brand names. 31 * 32 * Datasheets are available at MosChip www site at 33 * http://www.moschip.com. The datasheets don't contain full 34 * programming information for the chip. 35 * 36 * It is nornal to have only two enabled ports in devices, based on 37 * quad-port mos7840. 38 * 39 */ 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include <sys/stdint.h> 44 #include <sys/stddef.h> 45 #include <sys/param.h> 46 #include <sys/queue.h> 47 #include <sys/types.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <sys/bus.h> 51 #include <sys/linker_set.h> 52 #include <sys/module.h> 53 #include <sys/lock.h> 54 #include <sys/mutex.h> 55 #include <sys/condvar.h> 56 #include <sys/sysctl.h> 57 #include <sys/sx.h> 58 #include <sys/unistd.h> 59 #include <sys/callout.h> 60 #include <sys/malloc.h> 61 #include <sys/priv.h> 62 63 #include <dev/usb/usb.h> 64 #include <dev/usb/usbdi.h> 65 #include <dev/usb/usbdi_util.h> 66 #include <dev/usb/usb_cdc.h> 67 #include "usbdevs.h" 68 69 #define USB_DEBUG_VAR umcs_debug 70 #include <dev/usb/usb_debug.h> 71 #include <dev/usb/usb_process.h> 72 73 #include <dev/usb/serial/usb_serial.h> 74 75 #include <dev/usb/serial/umcs.h> 76 77 #define UMCS7840_MODVER 1 78 79 #ifdef USB_DEBUG 80 static int umcs_debug = 0; 81 82 static SYSCTL_NODE(_hw_usb, OID_AUTO, umcs, CTLFLAG_RW, 0, "USB umcs quadport serial adapter"); 83 SYSCTL_INT(_hw_usb_umcs, OID_AUTO, debug, CTLFLAG_RWTUN, &umcs_debug, 0, "Debug level"); 84 #endif /* USB_DEBUG */ 85 86 87 /* 88 * Two-port devices (both with 7820 chip and 7840 chip configured as two-port) 89 * have ports 0 and 2, with ports 1 and 3 omitted. 90 * So,PHYSICAL port numbers (indexes) on two-port device will be 0 and 2. 91 * This driver trys to use physical numbers as much as possible. 92 */ 93 94 /* 95 * Indexed by PHYSICAL port number. 96 * Pack non-regular registers to array to easier if-less access. 97 */ 98 struct umcs7840_port_registers { 99 uint8_t reg_sp; /* SP register. */ 100 uint8_t reg_control; /* CONTROL register. */ 101 uint8_t reg_dcr; /* DCR0 register. DCR1 & DCR2 can be 102 * calculated */ 103 }; 104 105 static const struct umcs7840_port_registers umcs7840_port_registers[UMCS7840_MAX_PORTS] = { 106 {.reg_sp = MCS7840_DEV_REG_SP1,.reg_control = MCS7840_DEV_REG_CONTROL1,.reg_dcr = MCS7840_DEV_REG_DCR0_1}, 107 {.reg_sp = MCS7840_DEV_REG_SP2,.reg_control = MCS7840_DEV_REG_CONTROL2,.reg_dcr = MCS7840_DEV_REG_DCR0_2}, 108 {.reg_sp = MCS7840_DEV_REG_SP3,.reg_control = MCS7840_DEV_REG_CONTROL3,.reg_dcr = MCS7840_DEV_REG_DCR0_3}, 109 {.reg_sp = MCS7840_DEV_REG_SP4,.reg_control = MCS7840_DEV_REG_CONTROL4,.reg_dcr = MCS7840_DEV_REG_DCR0_4}, 110 }; 111 112 enum { 113 UMCS7840_BULK_RD_EP, 114 UMCS7840_BULK_WR_EP, 115 UMCS7840_N_TRANSFERS 116 }; 117 118 struct umcs7840_softc_oneport { 119 struct usb_xfer *sc_xfer[UMCS7840_N_TRANSFERS]; /* Control structures 120 * for two transfers */ 121 122 uint8_t sc_lcr; /* local line control register */ 123 uint8_t sc_mcr; /* local modem control register */ 124 }; 125 126 struct umcs7840_softc { 127 struct ucom_super_softc sc_super_ucom; 128 struct ucom_softc sc_ucom[UMCS7840_MAX_PORTS]; /* Need to be continuous 129 * array, so indexed by 130 * LOGICAL port 131 * (subunit) number */ 132 133 struct usb_xfer *sc_intr_xfer; /* Interrupt endpoint */ 134 135 device_t sc_dev; /* Device for error prints */ 136 struct usb_device *sc_udev; /* USB Device for all operations */ 137 struct mtx sc_mtx; /* ucom requires this */ 138 139 uint8_t sc_driver_done; /* Flag when enumeration is finished */ 140 141 uint8_t sc_numports; /* Number of ports (subunits) */ 142 struct umcs7840_softc_oneport sc_ports[UMCS7840_MAX_PORTS]; /* Indexed by PHYSICAL 143 * port number. */ 144 }; 145 146 /* prototypes */ 147 static usb_error_t umcs7840_get_reg_sync(struct umcs7840_softc *, uint8_t, uint8_t *); 148 static usb_error_t umcs7840_set_reg_sync(struct umcs7840_softc *, uint8_t, uint8_t); 149 static usb_error_t umcs7840_get_UART_reg_sync(struct umcs7840_softc *, uint8_t, uint8_t, uint8_t *); 150 static usb_error_t umcs7840_set_UART_reg_sync(struct umcs7840_softc *, uint8_t, uint8_t, uint8_t); 151 152 static usb_error_t umcs7840_set_baudrate(struct umcs7840_softc *, uint8_t, uint32_t); 153 static usb_error_t umcs7840_calc_baudrate(uint32_t rate, uint16_t *, uint8_t *); 154 155 static void umcs7840_free(struct ucom_softc *); 156 static void umcs7840_cfg_get_status(struct ucom_softc *, uint8_t *, uint8_t *); 157 static void umcs7840_cfg_set_dtr(struct ucom_softc *, uint8_t); 158 static void umcs7840_cfg_set_rts(struct ucom_softc *, uint8_t); 159 static void umcs7840_cfg_set_break(struct ucom_softc *, uint8_t); 160 static void umcs7840_cfg_param(struct ucom_softc *, struct termios *); 161 static void umcs7840_cfg_open(struct ucom_softc *); 162 static void umcs7840_cfg_close(struct ucom_softc *); 163 164 static int umcs7840_pre_param(struct ucom_softc *, struct termios *); 165 166 static void umcs7840_start_read(struct ucom_softc *); 167 static void umcs7840_stop_read(struct ucom_softc *); 168 169 static void umcs7840_start_write(struct ucom_softc *); 170 static void umcs7840_stop_write(struct ucom_softc *); 171 172 static void umcs7840_poll(struct ucom_softc *ucom); 173 174 static device_probe_t umcs7840_probe; 175 static device_attach_t umcs7840_attach; 176 static device_detach_t umcs7840_detach; 177 static void umcs7840_free_softc(struct umcs7840_softc *); 178 179 static usb_callback_t umcs7840_intr_callback; 180 static usb_callback_t umcs7840_read_callback1; 181 static usb_callback_t umcs7840_read_callback2; 182 static usb_callback_t umcs7840_read_callback3; 183 static usb_callback_t umcs7840_read_callback4; 184 static usb_callback_t umcs7840_write_callback1; 185 static usb_callback_t umcs7840_write_callback2; 186 static usb_callback_t umcs7840_write_callback3; 187 static usb_callback_t umcs7840_write_callback4; 188 189 static void umcs7840_read_callbackN(struct usb_xfer *, usb_error_t, uint8_t); 190 static void umcs7840_write_callbackN(struct usb_xfer *, usb_error_t, uint8_t); 191 192 /* Indexed by LOGICAL port number (subunit), so two-port device uses 0 & 1 */ 193 static usb_callback_t *umcs7840_rw_callbacks[UMCS7840_MAX_PORTS][UMCS7840_N_TRANSFERS] = { 194 {&umcs7840_read_callback1, &umcs7840_write_callback1}, 195 {&umcs7840_read_callback2, &umcs7840_write_callback2}, 196 {&umcs7840_read_callback3, &umcs7840_write_callback3}, 197 {&umcs7840_read_callback4, &umcs7840_write_callback4}, 198 }; 199 200 static const struct usb_config umcs7840_bulk_config_data[UMCS7840_N_TRANSFERS] = { 201 [UMCS7840_BULK_RD_EP] = { 202 .type = UE_BULK, 203 .endpoint = 0x01, 204 .direction = UE_DIR_IN, 205 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,}, 206 .bufsize = 0, /* use wMaxPacketSize */ 207 .callback = &umcs7840_read_callback1, 208 .if_index = 0, 209 }, 210 211 [UMCS7840_BULK_WR_EP] = { 212 .type = UE_BULK, 213 .endpoint = 0x02, 214 .direction = UE_DIR_OUT, 215 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,}, 216 .bufsize = 0, /* use wMaxPacketSize */ 217 .callback = &umcs7840_write_callback1, 218 .if_index = 0, 219 }, 220 }; 221 222 static const struct usb_config umcs7840_intr_config_data[1] = { 223 [0] = { 224 .type = UE_INTERRUPT, 225 .endpoint = 0x09, 226 .direction = UE_DIR_IN, 227 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,}, 228 .bufsize = 0, /* use wMaxPacketSize */ 229 .callback = &umcs7840_intr_callback, 230 .if_index = 0, 231 }, 232 }; 233 234 static struct ucom_callback umcs7840_callback = { 235 .ucom_cfg_get_status = &umcs7840_cfg_get_status, 236 237 .ucom_cfg_set_dtr = &umcs7840_cfg_set_dtr, 238 .ucom_cfg_set_rts = &umcs7840_cfg_set_rts, 239 .ucom_cfg_set_break = &umcs7840_cfg_set_break, 240 241 .ucom_cfg_param = &umcs7840_cfg_param, 242 .ucom_cfg_open = &umcs7840_cfg_open, 243 .ucom_cfg_close = &umcs7840_cfg_close, 244 245 .ucom_pre_param = &umcs7840_pre_param, 246 247 .ucom_start_read = &umcs7840_start_read, 248 .ucom_stop_read = &umcs7840_stop_read, 249 250 .ucom_start_write = &umcs7840_start_write, 251 .ucom_stop_write = &umcs7840_stop_write, 252 253 .ucom_poll = &umcs7840_poll, 254 .ucom_free = &umcs7840_free, 255 }; 256 257 static const STRUCT_USB_HOST_ID umcs7840_devs[] = { 258 {USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7820, 0)}, 259 {USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7840, 0)}, 260 }; 261 262 static device_method_t umcs7840_methods[] = { 263 DEVMETHOD(device_probe, umcs7840_probe), 264 DEVMETHOD(device_attach, umcs7840_attach), 265 DEVMETHOD(device_detach, umcs7840_detach), 266 DEVMETHOD_END 267 }; 268 269 static devclass_t umcs7840_devclass; 270 271 static driver_t umcs7840_driver = { 272 .name = "umcs7840", 273 .methods = umcs7840_methods, 274 .size = sizeof(struct umcs7840_softc), 275 }; 276 277 DRIVER_MODULE(umcs7840, uhub, umcs7840_driver, umcs7840_devclass, 0, 0); 278 MODULE_DEPEND(umcs7840, ucom, 1, 1, 1); 279 MODULE_DEPEND(umcs7840, usb, 1, 1, 1); 280 MODULE_VERSION(umcs7840, UMCS7840_MODVER); 281 USB_PNP_HOST_INFO(umcs7840_devs); 282 283 static int 284 umcs7840_probe(device_t dev) 285 { 286 struct usb_attach_arg *uaa = device_get_ivars(dev); 287 288 if (uaa->usb_mode != USB_MODE_HOST) 289 return (ENXIO); 290 if (uaa->info.bConfigIndex != MCS7840_CONFIG_INDEX) 291 return (ENXIO); 292 if (uaa->info.bIfaceIndex != MCS7840_IFACE_INDEX) 293 return (ENXIO); 294 return (usbd_lookup_id_by_uaa(umcs7840_devs, sizeof(umcs7840_devs), uaa)); 295 } 296 297 static int 298 umcs7840_attach(device_t dev) 299 { 300 struct usb_config umcs7840_config_tmp[UMCS7840_N_TRANSFERS]; 301 struct usb_attach_arg *uaa = device_get_ivars(dev); 302 struct umcs7840_softc *sc = device_get_softc(dev); 303 304 uint8_t iface_index = MCS7840_IFACE_INDEX; 305 int error; 306 int subunit; 307 int n; 308 uint8_t data; 309 310 for (n = 0; n < UMCS7840_N_TRANSFERS; ++n) 311 umcs7840_config_tmp[n] = umcs7840_bulk_config_data[n]; 312 313 device_set_usb_desc(dev); 314 mtx_init(&sc->sc_mtx, "umcs7840", NULL, MTX_DEF); 315 ucom_ref(&sc->sc_super_ucom); 316 317 sc->sc_dev = dev; 318 sc->sc_udev = uaa->device; 319 320 /* 321 * Get number of ports 322 * Documentation (full datasheet) says, that number of ports is 323 * set as MCS7840_DEV_MODE_SELECT24S bit in MODE R/Only 324 * register. But vendor driver uses these undocumented 325 * register & bit. 326 * 327 * Experiments show, that MODE register can have `0' 328 * (4 ports) bit on 2-port device, so use vendor driver's way. 329 * 330 * Also, see notes in header file for these constants. 331 */ 332 umcs7840_get_reg_sync(sc, MCS7840_DEV_REG_GPIO, &data); 333 if (data & MCS7840_DEV_GPIO_4PORTS) { 334 sc->sc_numports = 4; 335 /* Store physical port numbers in sc_portno */ 336 sc->sc_ucom[0].sc_portno = 0; 337 sc->sc_ucom[1].sc_portno = 1; 338 sc->sc_ucom[2].sc_portno = 2; 339 sc->sc_ucom[3].sc_portno = 3; 340 } else { 341 sc->sc_numports = 2; 342 /* Store physical port numbers in sc_portno */ 343 sc->sc_ucom[0].sc_portno = 0; 344 sc->sc_ucom[1].sc_portno = 2; /* '1' is skipped */ 345 } 346 device_printf(dev, "Chip mcs%04x, found %d active ports\n", uaa->info.idProduct, sc->sc_numports); 347 if (!umcs7840_get_reg_sync(sc, MCS7840_DEV_REG_MODE, &data)) { 348 device_printf(dev, "On-die confguration: RST: active %s, HRD: %s, PLL: %s, POR: %s, Ports: %s, EEPROM write %s, IrDA is %savailable\n", 349 (data & MCS7840_DEV_MODE_RESET) ? "low" : "high", 350 (data & MCS7840_DEV_MODE_SER_PRSNT) ? "yes" : "no", 351 (data & MCS7840_DEV_MODE_PLLBYPASS) ? "bypassed" : "avail", 352 (data & MCS7840_DEV_MODE_PORBYPASS) ? "bypassed" : "avail", 353 (data & MCS7840_DEV_MODE_SELECT24S) ? "2" : "4", 354 (data & MCS7840_DEV_MODE_EEPROMWR) ? "enabled" : "disabled", 355 (data & MCS7840_DEV_MODE_IRDA) ? "" : "not "); 356 } 357 /* Setup all transfers */ 358 for (subunit = 0; subunit < sc->sc_numports; ++subunit) { 359 for (n = 0; n < UMCS7840_N_TRANSFERS; ++n) { 360 /* Set endpoint address */ 361 umcs7840_config_tmp[n].endpoint = umcs7840_bulk_config_data[n].endpoint + 2 * sc->sc_ucom[subunit].sc_portno; 362 umcs7840_config_tmp[n].callback = umcs7840_rw_callbacks[subunit][n]; 363 } 364 error = usbd_transfer_setup(uaa->device, 365 &iface_index, sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer, umcs7840_config_tmp, 366 UMCS7840_N_TRANSFERS, sc, &sc->sc_mtx); 367 if (error) { 368 device_printf(dev, "allocating USB transfers failed for subunit %d of %d\n", 369 subunit + 1, sc->sc_numports); 370 goto detach; 371 } 372 } 373 error = usbd_transfer_setup(uaa->device, 374 &iface_index, &sc->sc_intr_xfer, umcs7840_intr_config_data, 375 1, sc, &sc->sc_mtx); 376 if (error) { 377 device_printf(dev, "allocating USB transfers failed for interrupt\n"); 378 goto detach; 379 } 380 /* clear stall at first run */ 381 mtx_lock(&sc->sc_mtx); 382 for (subunit = 0; subunit < sc->sc_numports; ++subunit) { 383 usbd_xfer_set_stall(sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer[UMCS7840_BULK_RD_EP]); 384 usbd_xfer_set_stall(sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer[UMCS7840_BULK_WR_EP]); 385 } 386 mtx_unlock(&sc->sc_mtx); 387 388 error = ucom_attach(&sc->sc_super_ucom, sc->sc_ucom, sc->sc_numports, sc, 389 &umcs7840_callback, &sc->sc_mtx); 390 if (error) 391 goto detach; 392 393 ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev); 394 395 return (0); 396 397 detach: 398 umcs7840_detach(dev); 399 return (ENXIO); 400 } 401 402 static int 403 umcs7840_detach(device_t dev) 404 { 405 struct umcs7840_softc *sc = device_get_softc(dev); 406 int subunit; 407 408 ucom_detach(&sc->sc_super_ucom, sc->sc_ucom); 409 410 for (subunit = 0; subunit < sc->sc_numports; ++subunit) 411 usbd_transfer_unsetup(sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer, UMCS7840_N_TRANSFERS); 412 usbd_transfer_unsetup(&sc->sc_intr_xfer, 1); 413 414 device_claim_softc(dev); 415 416 umcs7840_free_softc(sc); 417 418 return (0); 419 } 420 421 UCOM_UNLOAD_DRAIN(umcs7840); 422 423 static void 424 umcs7840_free_softc(struct umcs7840_softc *sc) 425 { 426 if (ucom_unref(&sc->sc_super_ucom)) { 427 mtx_destroy(&sc->sc_mtx); 428 device_free_softc(sc); 429 } 430 } 431 432 static void 433 umcs7840_free(struct ucom_softc *ucom) 434 { 435 umcs7840_free_softc(ucom->sc_parent); 436 } 437 438 static void 439 umcs7840_cfg_open(struct ucom_softc *ucom) 440 { 441 struct umcs7840_softc *sc = ucom->sc_parent; 442 uint16_t pn = ucom->sc_portno; 443 uint8_t data; 444 445 /* If it very first open, finish global configuration */ 446 if (!sc->sc_driver_done) { 447 /* 448 * USB enumeration is finished, pass internal memory to FIFOs 449 * If it is done in the end of "attach", kernel panics. 450 */ 451 if (umcs7840_get_reg_sync(sc, MCS7840_DEV_REG_CONTROL1, &data)) 452 return; 453 data |= MCS7840_DEV_CONTROL1_DRIVER_DONE; 454 if (umcs7840_set_reg_sync(sc, MCS7840_DEV_REG_CONTROL1, data)) 455 return; 456 sc->sc_driver_done = 1; 457 } 458 /* Toggle reset bit on-off */ 459 if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, &data)) 460 return; 461 data |= MCS7840_DEV_SPx_UART_RESET; 462 if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, data)) 463 return; 464 data &= ~MCS7840_DEV_SPx_UART_RESET; 465 if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, data)) 466 return; 467 468 /* Set RS-232 mode */ 469 if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_SCRATCHPAD, MCS7840_UART_SCRATCHPAD_RS232)) 470 return; 471 472 /* Disable RX on time of initialization */ 473 if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_control, &data)) 474 return; 475 data |= MCS7840_DEV_CONTROLx_RX_DISABLE; 476 if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_control, data)) 477 return; 478 479 /* Disable all interrupts */ 480 if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_IER, 0)) 481 return; 482 483 /* Reset FIFO -- documented */ 484 if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_FCR, 0)) 485 return; 486 if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_FCR, 487 MCS7840_UART_FCR_ENABLE | MCS7840_UART_FCR_FLUSHRHR | 488 MCS7840_UART_FCR_FLUSHTHR | MCS7840_UART_FCR_RTL_1_14)) 489 return; 490 491 /* Set 8 bit, no parity, 1 stop bit -- documented */ 492 sc->sc_ports[pn].sc_lcr = MCS7840_UART_LCR_DATALEN8 | MCS7840_UART_LCR_STOPB1; 493 if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, sc->sc_ports[pn].sc_lcr)) 494 return; 495 496 /* 497 * Enable DTR/RTS on modem control, enable modem interrupts -- 498 * documented 499 */ 500 sc->sc_ports[pn].sc_mcr = MCS7840_UART_MCR_DTR | MCS7840_UART_MCR_RTS | MCS7840_UART_MCR_IE; 501 if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr)) 502 return; 503 504 /* Clearing Bulkin and Bulkout FIFO */ 505 if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, &data)) 506 return; 507 data |= MCS7840_DEV_SPx_RESET_OUT_FIFO | MCS7840_DEV_SPx_RESET_IN_FIFO; 508 if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, data)) 509 return; 510 data &= ~(MCS7840_DEV_SPx_RESET_OUT_FIFO | MCS7840_DEV_SPx_RESET_IN_FIFO); 511 if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, data)) 512 return; 513 514 /* Set speed 9600 */ 515 if (umcs7840_set_baudrate(sc, pn, 9600)) 516 return; 517 518 519 /* Finally enable all interrupts -- documented */ 520 /* 521 * Copied from vendor driver, I don't know why we should read LCR 522 * here 523 */ 524 if (umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, &sc->sc_ports[pn].sc_lcr)) 525 return; 526 if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_IER, 527 MCS7840_UART_IER_RXSTAT | MCS7840_UART_IER_MODEM)) 528 return; 529 530 /* Enable RX */ 531 if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_control, &data)) 532 return; 533 data &= ~MCS7840_DEV_CONTROLx_RX_DISABLE; 534 if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_control, data)) 535 return; 536 537 DPRINTF("Port %d has been opened\n", pn); 538 } 539 540 static void 541 umcs7840_cfg_close(struct ucom_softc *ucom) 542 { 543 struct umcs7840_softc *sc = ucom->sc_parent; 544 uint16_t pn = ucom->sc_portno; 545 uint8_t data; 546 547 umcs7840_stop_read(ucom); 548 umcs7840_stop_write(ucom); 549 550 umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, 0); 551 umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_IER, 0); 552 553 /* Disable RX */ 554 if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_control, &data)) 555 return; 556 data |= MCS7840_DEV_CONTROLx_RX_DISABLE; 557 if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_control, data)) 558 return; 559 DPRINTF("Port %d has been closed\n", pn); 560 } 561 562 static void 563 umcs7840_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff) 564 { 565 struct umcs7840_softc *sc = ucom->sc_parent; 566 uint8_t pn = ucom->sc_portno; 567 568 if (onoff) 569 sc->sc_ports[pn].sc_mcr |= MCS7840_UART_MCR_DTR; 570 else 571 sc->sc_ports[pn].sc_mcr &= ~MCS7840_UART_MCR_DTR; 572 573 umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr); 574 DPRINTF("Port %d DTR set to: %s\n", pn, onoff ? "on" : "off"); 575 } 576 577 static void 578 umcs7840_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff) 579 { 580 struct umcs7840_softc *sc = ucom->sc_parent; 581 uint8_t pn = ucom->sc_portno; 582 583 if (onoff) 584 sc->sc_ports[pn].sc_mcr |= MCS7840_UART_MCR_RTS; 585 else 586 sc->sc_ports[pn].sc_mcr &= ~MCS7840_UART_MCR_RTS; 587 588 umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr); 589 DPRINTF("Port %d RTS set to: %s\n", pn, onoff ? "on" : "off"); 590 } 591 592 static void 593 umcs7840_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff) 594 { 595 struct umcs7840_softc *sc = ucom->sc_parent; 596 uint8_t pn = ucom->sc_portno; 597 598 if (onoff) 599 sc->sc_ports[pn].sc_lcr |= MCS7840_UART_LCR_BREAK; 600 else 601 sc->sc_ports[pn].sc_lcr &= ~MCS7840_UART_LCR_BREAK; 602 603 umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, sc->sc_ports[pn].sc_lcr); 604 DPRINTF("Port %d BREAK set to: %s\n", pn, onoff ? "on" : "off"); 605 } 606 607 608 static void 609 umcs7840_cfg_param(struct ucom_softc *ucom, struct termios *t) 610 { 611 struct umcs7840_softc *sc = ucom->sc_parent; 612 uint8_t pn = ucom->sc_portno; 613 uint8_t lcr = sc->sc_ports[pn].sc_lcr; 614 uint8_t mcr = sc->sc_ports[pn].sc_mcr; 615 616 DPRINTF("Port %d config:\n", pn); 617 if (t->c_cflag & CSTOPB) { 618 DPRINTF(" 2 stop bits\n"); 619 lcr |= MCS7840_UART_LCR_STOPB2; 620 } else { 621 lcr |= MCS7840_UART_LCR_STOPB1; 622 DPRINTF(" 1 stop bit\n"); 623 } 624 625 lcr &= ~MCS7840_UART_LCR_PARITYMASK; 626 if (t->c_cflag & PARENB) { 627 lcr |= MCS7840_UART_LCR_PARITYON; 628 if (t->c_cflag & PARODD) { 629 lcr = MCS7840_UART_LCR_PARITYODD; 630 DPRINTF(" parity on - odd\n"); 631 } else { 632 lcr = MCS7840_UART_LCR_PARITYEVEN; 633 DPRINTF(" parity on - even\n"); 634 } 635 } else { 636 lcr &= ~MCS7840_UART_LCR_PARITYON; 637 DPRINTF(" parity off\n"); 638 } 639 640 lcr &= ~MCS7840_UART_LCR_DATALENMASK; 641 switch (t->c_cflag & CSIZE) { 642 case CS5: 643 lcr |= MCS7840_UART_LCR_DATALEN5; 644 DPRINTF(" 5 bit\n"); 645 break; 646 case CS6: 647 lcr |= MCS7840_UART_LCR_DATALEN6; 648 DPRINTF(" 6 bit\n"); 649 break; 650 case CS7: 651 lcr |= MCS7840_UART_LCR_DATALEN7; 652 DPRINTF(" 7 bit\n"); 653 break; 654 case CS8: 655 lcr |= MCS7840_UART_LCR_DATALEN8; 656 DPRINTF(" 8 bit\n"); 657 break; 658 } 659 660 if (t->c_cflag & CRTSCTS) { 661 mcr |= MCS7840_UART_MCR_CTSRTS; 662 DPRINTF(" CTS/RTS\n"); 663 } else 664 mcr &= ~MCS7840_UART_MCR_CTSRTS; 665 666 if (t->c_cflag & (CDTR_IFLOW | CDSR_OFLOW)) { 667 mcr |= MCS7840_UART_MCR_DTRDSR; 668 DPRINTF(" DTR/DSR\n"); 669 } else 670 mcr &= ~MCS7840_UART_MCR_DTRDSR; 671 672 sc->sc_ports[pn].sc_lcr = lcr; 673 umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, sc->sc_ports[pn].sc_lcr); 674 DPRINTF("Port %d LCR=%02x\n", pn, sc->sc_ports[pn].sc_lcr); 675 676 sc->sc_ports[pn].sc_mcr = mcr; 677 umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr); 678 DPRINTF("Port %d MCR=%02x\n", pn, sc->sc_ports[pn].sc_mcr); 679 680 umcs7840_set_baudrate(sc, pn, t->c_ospeed); 681 } 682 683 684 static int 685 umcs7840_pre_param(struct ucom_softc *ucom, struct termios *t) 686 { 687 uint8_t clk; 688 uint16_t divisor; 689 690 if (umcs7840_calc_baudrate(t->c_ospeed, &divisor, &clk) || !divisor) 691 return (EINVAL); 692 return (0); 693 } 694 695 static void 696 umcs7840_start_read(struct ucom_softc *ucom) 697 { 698 struct umcs7840_softc *sc = ucom->sc_parent; 699 uint8_t pn = ucom->sc_portno; 700 701 /* Start interrupt transfer */ 702 usbd_transfer_start(sc->sc_intr_xfer); 703 704 /* Start read transfer */ 705 usbd_transfer_start(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_RD_EP]); 706 } 707 708 static void 709 umcs7840_stop_read(struct ucom_softc *ucom) 710 { 711 struct umcs7840_softc *sc = ucom->sc_parent; 712 uint8_t pn = ucom->sc_portno; 713 714 /* Stop read transfer */ 715 usbd_transfer_stop(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_RD_EP]); 716 } 717 718 static void 719 umcs7840_start_write(struct ucom_softc *ucom) 720 { 721 struct umcs7840_softc *sc = ucom->sc_parent; 722 uint8_t pn = ucom->sc_portno; 723 724 /* Start interrupt transfer */ 725 usbd_transfer_start(sc->sc_intr_xfer); 726 727 /* Start write transfer */ 728 usbd_transfer_start(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_WR_EP]); 729 } 730 731 static void 732 umcs7840_stop_write(struct ucom_softc *ucom) 733 { 734 struct umcs7840_softc *sc = ucom->sc_parent; 735 uint8_t pn = ucom->sc_portno; 736 737 /* Stop write transfer */ 738 usbd_transfer_stop(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_WR_EP]); 739 } 740 741 static void 742 umcs7840_cfg_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr) 743 { 744 struct umcs7840_softc *sc = ucom->sc_parent; 745 uint8_t pn = ucom->sc_portno; 746 uint8_t hw_lsr = 0; /* local line status register */ 747 uint8_t hw_msr = 0; /* local modem status register */ 748 749 /* Read LSR & MSR */ 750 umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_LSR, &hw_lsr); 751 umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_MSR, &hw_msr); 752 753 *lsr = hw_lsr; 754 *msr = hw_msr; 755 756 DPRINTF("Port %d status: LSR=%02x MSR=%02x\n", ucom->sc_portno, *lsr, *msr); 757 } 758 759 static void 760 umcs7840_intr_callback(struct usb_xfer *xfer, usb_error_t error) 761 { 762 struct umcs7840_softc *sc = usbd_xfer_softc(xfer); 763 struct usb_page_cache *pc; 764 uint8_t buf[13]; 765 int actlen; 766 int subunit; 767 768 usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL); 769 770 switch (USB_GET_STATE(xfer)) { 771 case USB_ST_TRANSFERRED: 772 if (actlen == 5 || actlen == 13) { 773 pc = usbd_xfer_get_frame(xfer, 0); 774 usbd_copy_out(pc, 0, buf, actlen); 775 /* Check status of all ports */ 776 for (subunit = 0; subunit < sc->sc_numports; ++subunit) { 777 uint8_t pn = sc->sc_ucom[subunit].sc_portno; 778 779 if (buf[pn] & MCS7840_UART_ISR_NOPENDING) 780 continue; 781 DPRINTF("Port %d has pending interrupt: %02x (FIFO: %02x)\n", pn, buf[pn] & MCS7840_UART_ISR_INTMASK, buf[pn] & (~MCS7840_UART_ISR_INTMASK)); 782 switch (buf[pn] & MCS7840_UART_ISR_INTMASK) { 783 case MCS7840_UART_ISR_RXERR: 784 case MCS7840_UART_ISR_RXHASDATA: 785 case MCS7840_UART_ISR_RXTIMEOUT: 786 case MCS7840_UART_ISR_MSCHANGE: 787 ucom_status_change(&sc->sc_ucom[subunit]); 788 break; 789 default: 790 /* Do nothing */ 791 break; 792 } 793 } 794 } else 795 device_printf(sc->sc_dev, "Invalid interrupt data length %d", actlen); 796 /* FALLTHROUGH */ 797 case USB_ST_SETUP: 798 tr_setup: 799 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer)); 800 usbd_transfer_submit(xfer); 801 return; 802 803 default: /* Error */ 804 if (error != USB_ERR_CANCELLED) { 805 /* try to clear stall first */ 806 usbd_xfer_set_stall(xfer); 807 goto tr_setup; 808 } 809 return; 810 } 811 } 812 813 static void 814 umcs7840_read_callback1(struct usb_xfer *xfer, usb_error_t error) 815 { 816 umcs7840_read_callbackN(xfer, error, 0); 817 } 818 819 static void 820 umcs7840_read_callback2(struct usb_xfer *xfer, usb_error_t error) 821 { 822 umcs7840_read_callbackN(xfer, error, 1); 823 } 824 static void 825 umcs7840_read_callback3(struct usb_xfer *xfer, usb_error_t error) 826 { 827 umcs7840_read_callbackN(xfer, error, 2); 828 } 829 830 static void 831 umcs7840_read_callback4(struct usb_xfer *xfer, usb_error_t error) 832 { 833 umcs7840_read_callbackN(xfer, error, 3); 834 } 835 836 static void 837 umcs7840_read_callbackN(struct usb_xfer *xfer, usb_error_t error, uint8_t subunit) 838 { 839 struct umcs7840_softc *sc = usbd_xfer_softc(xfer); 840 struct ucom_softc *ucom = &sc->sc_ucom[subunit]; 841 struct usb_page_cache *pc; 842 int actlen; 843 844 usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL); 845 846 DPRINTF("Port %d read, state = %d, data length = %d\n", ucom->sc_portno, USB_GET_STATE(xfer), actlen); 847 848 switch (USB_GET_STATE(xfer)) { 849 case USB_ST_TRANSFERRED: 850 pc = usbd_xfer_get_frame(xfer, 0); 851 ucom_put_data(ucom, pc, 0, actlen); 852 /* FALLTHROUGH */ 853 case USB_ST_SETUP: 854 tr_setup: 855 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer)); 856 usbd_transfer_submit(xfer); 857 return; 858 859 default: /* Error */ 860 if (error != USB_ERR_CANCELLED) { 861 /* try to clear stall first */ 862 usbd_xfer_set_stall(xfer); 863 goto tr_setup; 864 } 865 return; 866 } 867 } 868 869 static void 870 umcs7840_write_callback1(struct usb_xfer *xfer, usb_error_t error) 871 { 872 umcs7840_write_callbackN(xfer, error, 0); 873 } 874 875 static void 876 umcs7840_write_callback2(struct usb_xfer *xfer, usb_error_t error) 877 { 878 umcs7840_write_callbackN(xfer, error, 1); 879 } 880 881 static void 882 umcs7840_write_callback3(struct usb_xfer *xfer, usb_error_t error) 883 { 884 umcs7840_write_callbackN(xfer, error, 2); 885 } 886 887 static void 888 umcs7840_write_callback4(struct usb_xfer *xfer, usb_error_t error) 889 { 890 umcs7840_write_callbackN(xfer, error, 3); 891 } 892 893 static void 894 umcs7840_write_callbackN(struct usb_xfer *xfer, usb_error_t error, uint8_t subunit) 895 { 896 struct umcs7840_softc *sc = usbd_xfer_softc(xfer); 897 struct ucom_softc *ucom = &sc->sc_ucom[subunit]; 898 struct usb_page_cache *pc; 899 uint32_t actlen; 900 901 DPRINTF("Port %d write, state = %d\n", ucom->sc_portno, USB_GET_STATE(xfer)); 902 903 switch (USB_GET_STATE(xfer)) { 904 case USB_ST_SETUP: 905 case USB_ST_TRANSFERRED: 906 tr_setup: 907 pc = usbd_xfer_get_frame(xfer, 0); 908 if (ucom_get_data(ucom, pc, 0, usbd_xfer_max_len(xfer), &actlen)) { 909 DPRINTF("Port %d write, has %d bytes\n", ucom->sc_portno, actlen); 910 usbd_xfer_set_frame_len(xfer, 0, actlen); 911 usbd_transfer_submit(xfer); 912 } 913 return; 914 915 default: /* Error */ 916 if (error != USB_ERR_CANCELLED) { 917 /* try to clear stall first */ 918 usbd_xfer_set_stall(xfer); 919 goto tr_setup; 920 } 921 return; 922 } 923 } 924 925 static void 926 umcs7840_poll(struct ucom_softc *ucom) 927 { 928 struct umcs7840_softc *sc = ucom->sc_parent; 929 930 DPRINTF("Port %d poll\n", ucom->sc_portno); 931 usbd_transfer_poll(sc->sc_ports[ucom->sc_portno].sc_xfer, UMCS7840_N_TRANSFERS); 932 usbd_transfer_poll(&sc->sc_intr_xfer, 1); 933 } 934 935 static usb_error_t 936 umcs7840_get_reg_sync(struct umcs7840_softc *sc, uint8_t reg, uint8_t *data) 937 { 938 struct usb_device_request req; 939 usb_error_t err; 940 uint16_t len; 941 942 req.bmRequestType = UT_READ_VENDOR_DEVICE; 943 req.bRequest = MCS7840_RDREQ; 944 USETW(req.wValue, 0); 945 USETW(req.wIndex, reg); 946 USETW(req.wLength, UMCS7840_READ_LENGTH); 947 948 err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, (void *)data, 0, &len, UMCS7840_CTRL_TIMEOUT); 949 if (err == USB_ERR_NORMAL_COMPLETION && len != 1) { 950 device_printf(sc->sc_dev, "Reading register %d failed: invalid length %d\n", reg, len); 951 return (USB_ERR_INVAL); 952 } else if (err) 953 device_printf(sc->sc_dev, "Reading register %d failed: %s\n", reg, usbd_errstr(err)); 954 return (err); 955 } 956 957 static usb_error_t 958 umcs7840_set_reg_sync(struct umcs7840_softc *sc, uint8_t reg, uint8_t data) 959 { 960 struct usb_device_request req; 961 usb_error_t err; 962 963 req.bmRequestType = UT_WRITE_VENDOR_DEVICE; 964 req.bRequest = MCS7840_WRREQ; 965 USETW(req.wValue, data); 966 USETW(req.wIndex, reg); 967 USETW(req.wLength, 0); 968 969 err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, NULL, 0, NULL, UMCS7840_CTRL_TIMEOUT); 970 if (err) 971 device_printf(sc->sc_dev, "Writing register %d failed: %s\n", reg, usbd_errstr(err)); 972 973 return (err); 974 } 975 976 static usb_error_t 977 umcs7840_get_UART_reg_sync(struct umcs7840_softc *sc, uint8_t portno, uint8_t reg, uint8_t *data) 978 { 979 struct usb_device_request req; 980 uint16_t wVal; 981 usb_error_t err; 982 uint16_t len; 983 984 /* portno is port number */ 985 wVal = ((uint16_t)(portno + 1)) << 8; 986 987 req.bmRequestType = UT_READ_VENDOR_DEVICE; 988 req.bRequest = MCS7840_RDREQ; 989 USETW(req.wValue, wVal); 990 USETW(req.wIndex, reg); 991 USETW(req.wLength, UMCS7840_READ_LENGTH); 992 993 err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, (void *)data, 0, &len, UMCS7840_CTRL_TIMEOUT); 994 if (err == USB_ERR_NORMAL_COMPLETION && len != 1) { 995 device_printf(sc->sc_dev, "Reading UART%d register %d failed: invalid length %d\n", portno, reg, len); 996 return (USB_ERR_INVAL); 997 } else if (err) 998 device_printf(sc->sc_dev, "Reading UART%d register %d failed: %s\n", portno, reg, usbd_errstr(err)); 999 return (err); 1000 } 1001 1002 static usb_error_t 1003 umcs7840_set_UART_reg_sync(struct umcs7840_softc *sc, uint8_t portno, uint8_t reg, uint8_t data) 1004 { 1005 struct usb_device_request req; 1006 usb_error_t err; 1007 uint16_t wVal; 1008 1009 /* portno is port number */ 1010 wVal = ((uint16_t)(portno + 1)) << 8 | data; 1011 1012 req.bmRequestType = UT_WRITE_VENDOR_DEVICE; 1013 req.bRequest = MCS7840_WRREQ; 1014 USETW(req.wValue, wVal); 1015 USETW(req.wIndex, reg); 1016 USETW(req.wLength, 0); 1017 1018 err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, NULL, 0, NULL, UMCS7840_CTRL_TIMEOUT); 1019 if (err) 1020 device_printf(sc->sc_dev, "Writing UART%d register %d failed: %s\n", portno, reg, usbd_errstr(err)); 1021 return (err); 1022 } 1023 1024 static usb_error_t 1025 umcs7840_set_baudrate(struct umcs7840_softc *sc, uint8_t portno, uint32_t rate) 1026 { 1027 usb_error_t err; 1028 uint16_t divisor; 1029 uint8_t clk; 1030 uint8_t data; 1031 1032 if (umcs7840_calc_baudrate(rate, &divisor, &clk)) { 1033 DPRINTF("Port %d bad speed: %d\n", portno, rate); 1034 return (-1); 1035 } 1036 if (divisor == 0 || (clk & MCS7840_DEV_SPx_CLOCK_MASK) != clk) { 1037 DPRINTF("Port %d bad speed calculation: %d\n", portno, rate); 1038 return (-1); 1039 } 1040 DPRINTF("Port %d set speed: %d (%02x / %d)\n", portno, rate, clk, divisor); 1041 1042 /* Set clock source for standard BAUD frequences */ 1043 err = umcs7840_get_reg_sync(sc, umcs7840_port_registers[portno].reg_sp, &data); 1044 if (err) 1045 return (err); 1046 data &= MCS7840_DEV_SPx_CLOCK_MASK; 1047 data |= clk; 1048 err = umcs7840_set_reg_sync(sc, umcs7840_port_registers[portno].reg_sp, data); 1049 if (err) 1050 return (err); 1051 1052 /* Set divider */ 1053 sc->sc_ports[portno].sc_lcr |= MCS7840_UART_LCR_DIVISORS; 1054 err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_LCR, sc->sc_ports[portno].sc_lcr); 1055 if (err) 1056 return (err); 1057 1058 err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_DLL, (uint8_t)(divisor & 0xff)); 1059 if (err) 1060 return (err); 1061 err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_DLM, (uint8_t)((divisor >> 8) & 0xff)); 1062 if (err) 1063 return (err); 1064 1065 /* Turn off access to DLL/DLM registers of UART */ 1066 sc->sc_ports[portno].sc_lcr &= ~MCS7840_UART_LCR_DIVISORS; 1067 err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_LCR, sc->sc_ports[portno].sc_lcr); 1068 if (err) 1069 return (err); 1070 return (0); 1071 } 1072 1073 /* Maximum speeds for standard frequences, when PLL is not used */ 1074 static const uint32_t umcs7840_baudrate_divisors[] = {0, 115200, 230400, 403200, 460800, 806400, 921600, 1572864, 3145728,}; 1075 static const uint8_t umcs7840_baudrate_divisors_len = nitems(umcs7840_baudrate_divisors); 1076 1077 static usb_error_t 1078 umcs7840_calc_baudrate(uint32_t rate, uint16_t *divisor, uint8_t *clk) 1079 { 1080 uint8_t i = 0; 1081 1082 if (rate > umcs7840_baudrate_divisors[umcs7840_baudrate_divisors_len - 1]) 1083 return (-1); 1084 1085 for (i = 0; i < umcs7840_baudrate_divisors_len - 1 && 1086 !(rate > umcs7840_baudrate_divisors[i] && rate <= umcs7840_baudrate_divisors[i + 1]); ++i); 1087 if (rate == 0) 1088 *divisor = 1; /* XXX */ 1089 else 1090 *divisor = umcs7840_baudrate_divisors[i + 1] / rate; 1091 /* 0x00 .. 0x70 */ 1092 *clk = i << MCS7840_DEV_SPx_CLOCK_SHIFT; 1093 return (0); 1094 } 1095