sys/dev/usb/serial/umcs.c

   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_msr = 0;     /* local modem status register */
 747
 748         /*
 749          * Read status registers.  MSR bits need translation from ns16550 to
 750          * SER_* values.  LSR bits are ns16550 in hardware and ucom.
 751          */
 752         umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_LSR, lsr);
 753         umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_MSR, &hw_msr);
 754
 755         if (hw_msr & MCS7840_UART_MSR_NEGCTS)
 756                 *msr |= SER_CTS;
 757
 758         if (hw_msr & MCS7840_UART_MSR_NEGDCD)
 759                 *msr |= SER_DCD;
 760
 761         if (hw_msr & MCS7840_UART_MSR_NEGRI)
 762                 *msr |= SER_RI;
 763
 764         if (hw_msr & MCS7840_UART_MSR_NEGDSR)
 765                 *msr |= SER_DSR;
 766
 767         DPRINTF("Port %d status: LSR=%02x MSR=%02x\n", ucom->sc_portno, *lsr, *msr);
 768 }
 769
 770 static void
 771 umcs7840_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 772 {
 773         struct umcs7840_softc *sc = usbd_xfer_softc(xfer);
 774         struct usb_page_cache *pc;
 775         uint8_t buf[13];
 776         int actlen;
 777         int subunit;
 778
 779         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 780
 781         switch (USB_GET_STATE(xfer)) {
 782         case USB_ST_TRANSFERRED:
 783                 if (actlen == 5 || actlen == 13) {
 784                         pc = usbd_xfer_get_frame(xfer, 0);
 785                         usbd_copy_out(pc, 0, buf, actlen);
 786                         /* Check status of all ports */
 787                         for (subunit = 0; subunit < sc->sc_numports; ++subunit) {
 788                                 uint8_t pn = sc->sc_ucom[subunit].sc_portno;
 789
 790                                 if (buf[pn] & MCS7840_UART_ISR_NOPENDING)
 791                                         continue;
 792                                 DPRINTF("Port %d has pending interrupt: %02x (FIFO: %02x)\n", pn, buf[pn] & MCS7840_UART_ISR_INTMASK, buf[pn] & (~MCS7840_UART_ISR_INTMASK));
 793                                 switch (buf[pn] & MCS7840_UART_ISR_INTMASK) {
 794                                 case MCS7840_UART_ISR_RXERR:
 795                                 case MCS7840_UART_ISR_RXHASDATA:
 796                                 case MCS7840_UART_ISR_RXTIMEOUT:
 797                                 case MCS7840_UART_ISR_MSCHANGE:
 798                                         ucom_status_change(&sc->sc_ucom[subunit]);
 799                                         break;
 800                                 default:
 801                                         /* Do nothing */
 802                                         break;
 803                                 }
 804                         }
 805                 } else
 806                         device_printf(sc->sc_dev, "Invalid interrupt data length %d", actlen);
 807                 /* FALLTHROUGH */
 808         case USB_ST_SETUP:
 809 tr_setup:
 810                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 811                 usbd_transfer_submit(xfer);
 812                 return;
 813
 814         default:                        /* Error */
 815                 if (error != USB_ERR_CANCELLED) {
 816                         /* try to clear stall first */
 817                         usbd_xfer_set_stall(xfer);
 818                         goto tr_setup;
 819                 }
 820                 return;
 821         }
 822 }
 823
 824 static void
 825 umcs7840_read_callback1(struct usb_xfer *xfer, usb_error_t error)
 826 {
 827         umcs7840_read_callbackN(xfer, error, 0);
 828 }
 829
 830 static void
 831 umcs7840_read_callback2(struct usb_xfer *xfer, usb_error_t error)
 832 {
 833         umcs7840_read_callbackN(xfer, error, 1);
 834 }
 835 static void
 836 umcs7840_read_callback3(struct usb_xfer *xfer, usb_error_t error)
 837 {
 838         umcs7840_read_callbackN(xfer, error, 2);
 839 }
 840
 841 static void
 842 umcs7840_read_callback4(struct usb_xfer *xfer, usb_error_t error)
 843 {
 844         umcs7840_read_callbackN(xfer, error, 3);
 845 }
 846
 847 static void
 848 umcs7840_read_callbackN(struct usb_xfer *xfer, usb_error_t error, uint8_t subunit)
 849 {
 850         struct umcs7840_softc *sc = usbd_xfer_softc(xfer);
 851         struct ucom_softc *ucom = &sc->sc_ucom[subunit];
 852         struct usb_page_cache *pc;
 853         int actlen;
 854
 855         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 856
 857         DPRINTF("Port %d read, state = %d, data length = %d\n", ucom->sc_portno, USB_GET_STATE(xfer), actlen);
 858
 859         switch (USB_GET_STATE(xfer)) {
 860         case USB_ST_TRANSFERRED:
 861                 pc = usbd_xfer_get_frame(xfer, 0);
 862                 ucom_put_data(ucom, pc, 0, actlen);
 863                 /* FALLTHROUGH */
 864         case USB_ST_SETUP:
 865 tr_setup:
 866                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 867                 usbd_transfer_submit(xfer);
 868                 return;
 869
 870         default:                        /* Error */
 871                 if (error != USB_ERR_CANCELLED) {
 872                         /* try to clear stall first */
 873                         usbd_xfer_set_stall(xfer);
 874                         goto tr_setup;
 875                 }
 876                 return;
 877         }
 878 }
 879
 880 static void
 881 umcs7840_write_callback1(struct usb_xfer *xfer, usb_error_t error)
 882 {
 883         umcs7840_write_callbackN(xfer, error, 0);
 884 }
 885
 886 static void
 887 umcs7840_write_callback2(struct usb_xfer *xfer, usb_error_t error)
 888 {
 889         umcs7840_write_callbackN(xfer, error, 1);
 890 }
 891
 892 static void
 893 umcs7840_write_callback3(struct usb_xfer *xfer, usb_error_t error)
 894 {
 895         umcs7840_write_callbackN(xfer, error, 2);
 896 }
 897
 898 static void
 899 umcs7840_write_callback4(struct usb_xfer *xfer, usb_error_t error)
 900 {
 901         umcs7840_write_callbackN(xfer, error, 3);
 902 }
 903
 904 static void
 905 umcs7840_write_callbackN(struct usb_xfer *xfer, usb_error_t error, uint8_t subunit)
 906 {
 907         struct umcs7840_softc *sc = usbd_xfer_softc(xfer);
 908         struct ucom_softc *ucom = &sc->sc_ucom[subunit];
 909         struct usb_page_cache *pc;
 910         uint32_t actlen;
 911
 912         DPRINTF("Port %d write, state = %d\n", ucom->sc_portno, USB_GET_STATE(xfer));
 913
 914         switch (USB_GET_STATE(xfer)) {
 915         case USB_ST_SETUP:
 916         case USB_ST_TRANSFERRED:
 917 tr_setup:
 918                 pc = usbd_xfer_get_frame(xfer, 0);
 919                 if (ucom_get_data(ucom, pc, 0, usbd_xfer_max_len(xfer), &actlen)) {
 920                         DPRINTF("Port %d write, has %d bytes\n", ucom->sc_portno, actlen);
 921                         usbd_xfer_set_frame_len(xfer, 0, actlen);
 922                         usbd_transfer_submit(xfer);
 923                 }
 924                 return;
 925
 926         default:                        /* Error */
 927                 if (error != USB_ERR_CANCELLED) {
 928                         /* try to clear stall first */
 929                         usbd_xfer_set_stall(xfer);
 930                         goto tr_setup;
 931                 }
 932                 return;
 933         }
 934 }
 935
 936 static void
 937 umcs7840_poll(struct ucom_softc *ucom)
 938 {
 939         struct umcs7840_softc *sc = ucom->sc_parent;
 940
 941         DPRINTF("Port %d poll\n", ucom->sc_portno);
 942         usbd_transfer_poll(sc->sc_ports[ucom->sc_portno].sc_xfer, UMCS7840_N_TRANSFERS);
 943         usbd_transfer_poll(&sc->sc_intr_xfer, 1);
 944 }
 945
 946 static usb_error_t
 947 umcs7840_get_reg_sync(struct umcs7840_softc *sc, uint8_t reg, uint8_t *data)
 948 {
 949         struct usb_device_request req;
 950         usb_error_t err;
 951         uint16_t len;
 952
 953         req.bmRequestType = UT_READ_VENDOR_DEVICE;
 954         req.bRequest = MCS7840_RDREQ;
 955         USETW(req.wValue, 0);
 956         USETW(req.wIndex, reg);
 957         USETW(req.wLength, UMCS7840_READ_LENGTH);
 958
 959         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, (void *)data, 0, &len, UMCS7840_CTRL_TIMEOUT);
 960         if (err == USB_ERR_NORMAL_COMPLETION && len != 1) {
 961                 device_printf(sc->sc_dev, "Reading register %d failed: invalid length %d\n", reg, len);
 962                 return (USB_ERR_INVAL);
 963         } else if (err)
 964                 device_printf(sc->sc_dev, "Reading register %d failed: %s\n", reg, usbd_errstr(err));
 965         return (err);
 966 }
 967
 968 static usb_error_t
 969 umcs7840_set_reg_sync(struct umcs7840_softc *sc, uint8_t reg, uint8_t data)
 970 {
 971         struct usb_device_request req;
 972         usb_error_t err;
 973
 974         req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
 975         req.bRequest = MCS7840_WRREQ;
 976         USETW(req.wValue, data);
 977         USETW(req.wIndex, reg);
 978         USETW(req.wLength, 0);
 979
 980         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, NULL, 0, NULL, UMCS7840_CTRL_TIMEOUT);
 981         if (err)
 982                 device_printf(sc->sc_dev, "Writing register %d failed: %s\n", reg, usbd_errstr(err));
 983
 984         return (err);
 985 }
 986
 987 static usb_error_t
 988 umcs7840_get_UART_reg_sync(struct umcs7840_softc *sc, uint8_t portno, uint8_t reg, uint8_t *data)
 989 {
 990         struct usb_device_request req;
 991         uint16_t wVal;
 992         usb_error_t err;
 993         uint16_t len;
 994
 995         /* portno is port number */
 996         wVal = ((uint16_t)(portno + 1)) << 8;
 997
 998         req.bmRequestType = UT_READ_VENDOR_DEVICE;
 999         req.bRequest = MCS7840_RDREQ;
1000         USETW(req.wValue, wVal);
1001         USETW(req.wIndex, reg);
1002         USETW(req.wLength, UMCS7840_READ_LENGTH);
1003
1004         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, (void *)data, 0, &len, UMCS7840_CTRL_TIMEOUT);
1005         if (err == USB_ERR_NORMAL_COMPLETION && len != 1) {
1006                 device_printf(sc->sc_dev, "Reading UART%d register %d failed: invalid length %d\n", portno, reg, len);
1007                 return (USB_ERR_INVAL);
1008         } else if (err)
1009                 device_printf(sc->sc_dev, "Reading UART%d register %d failed: %s\n", portno, reg, usbd_errstr(err));
1010         return (err);
1011 }
1012
1013 static usb_error_t
1014 umcs7840_set_UART_reg_sync(struct umcs7840_softc *sc, uint8_t portno, uint8_t reg, uint8_t data)
1015 {
1016         struct usb_device_request req;
1017         usb_error_t err;
1018         uint16_t wVal;
1019
1020         /* portno is port number */
1021         wVal = ((uint16_t)(portno + 1)) << 8 | data;
1022
1023         req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
1024         req.bRequest = MCS7840_WRREQ;
1025         USETW(req.wValue, wVal);
1026         USETW(req.wIndex, reg);
1027         USETW(req.wLength, 0);
1028
1029         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, NULL, 0, NULL, UMCS7840_CTRL_TIMEOUT);
1030         if (err)
1031                 device_printf(sc->sc_dev, "Writing UART%d register %d failed: %s\n", portno, reg, usbd_errstr(err));
1032         return (err);
1033 }
1034
1035 static usb_error_t
1036 umcs7840_set_baudrate(struct umcs7840_softc *sc, uint8_t portno, uint32_t rate)
1037 {
1038         usb_error_t err;
1039         uint16_t divisor;
1040         uint8_t clk;
1041         uint8_t data;
1042
1043         if (umcs7840_calc_baudrate(rate, &divisor, &clk)) {
1044                 DPRINTF("Port %d bad speed: %d\n", portno, rate);
1045                 return (-1);
1046         }
1047         if (divisor == 0 || (clk & MCS7840_DEV_SPx_CLOCK_MASK) != clk) {
1048                 DPRINTF("Port %d bad speed calculation: %d\n", portno, rate);
1049                 return (-1);
1050         }
1051         DPRINTF("Port %d set speed: %d (%02x / %d)\n", portno, rate, clk, divisor);
1052
1053         /* Set clock source for standard BAUD frequences */
1054         err = umcs7840_get_reg_sync(sc, umcs7840_port_registers[portno].reg_sp, &data);
1055         if (err)
1056                 return (err);
1057         data &= MCS7840_DEV_SPx_CLOCK_MASK;
1058         data |= clk;
1059         err = umcs7840_set_reg_sync(sc, umcs7840_port_registers[portno].reg_sp, data);
1060         if (err)
1061                 return (err);
1062
1063         /* Set divider */
1064         sc->sc_ports[portno].sc_lcr |= MCS7840_UART_LCR_DIVISORS;
1065         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_LCR, sc->sc_ports[portno].sc_lcr);
1066         if (err)
1067                 return (err);
1068
1069         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_DLL, (uint8_t)(divisor & 0xff));
1070         if (err)
1071                 return (err);
1072         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_DLM, (uint8_t)((divisor >> 8) & 0xff));
1073         if (err)
1074                 return (err);
1075
1076         /* Turn off access to DLL/DLM registers of UART */
1077         sc->sc_ports[portno].sc_lcr &= ~MCS7840_UART_LCR_DIVISORS;
1078         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_LCR, sc->sc_ports[portno].sc_lcr);
1079         if (err)
1080                 return (err);
1081         return (0);
1082 }
1083
1084 /* Maximum speeds for standard frequences, when PLL is not used */
1085 static const uint32_t umcs7840_baudrate_divisors[] = {0, 115200, 230400, 403200, 460800, 806400, 921600, 1572864, 3145728,};
1086 static const uint8_t umcs7840_baudrate_divisors_len = nitems(umcs7840_baudrate_divisors);
1087
1088 static usb_error_t
1089 umcs7840_calc_baudrate(uint32_t rate, uint16_t *divisor, uint8_t *clk)
1090 {
1091         uint8_t i = 0;
1092
1093         if (rate > umcs7840_baudrate_divisors[umcs7840_baudrate_divisors_len - 1])
1094                 return (-1);
1095
1096         for (i = 0; i < umcs7840_baudrate_divisors_len - 1 &&
1097             !(rate > umcs7840_baudrate_divisors[i] && rate <= umcs7840_baudrate_divisors[i + 1]); ++i);
1098         if (rate == 0)
1099                 *divisor = 1;   /* XXX */
1100         else
1101                 *divisor = umcs7840_baudrate_divisors[i + 1] / rate;
1102         /* 0x00 .. 0x70 */
1103         *clk = i << MCS7840_DEV_SPx_CLOCK_SHIFT;
1104         return (0);
1105 }