sys/dev/usb/serial/umcs.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2010 Lev Serebryakov <lev@FreeBSD.org>.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 /*
  30  * This driver supports several multiport USB-to-RS232 serial adapters driven
  31  * by MosChip mos7820 and mos7840, bridge chips.
  32  * The adapters are sold under many different brand names.
  33  *
  34  * Datasheets are available at MosChip www site at
  35  * http://www.moschip.com.  The datasheets don't contain full
  36  * programming information for the chip.
  37  *
  38  * It is nornal to have only two enabled ports in devices, based on
  39  * quad-port mos7840.
  40  *
  41  */
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 #include <sys/stdint.h>
  46 #include <sys/stddef.h>
  47 #include <sys/param.h>
  48 #include <sys/queue.h>
  49 #include <sys/types.h>
  50 #include <sys/systm.h>
  51 #include <sys/kernel.h>
  52 #include <sys/bus.h>
  53 #include <sys/linker_set.h>
  54 #include <sys/module.h>
  55 #include <sys/lock.h>
  56 #include <sys/mutex.h>
  57 #include <sys/condvar.h>
  58 #include <sys/sysctl.h>
  59 #include <sys/sx.h>
  60 #include <sys/unistd.h>
  61 #include <sys/callout.h>
  62 #include <sys/malloc.h>
  63 #include <sys/priv.h>
  64
  65 #include <dev/usb/usb.h>
  66 #include <dev/usb/usbdi.h>
  67 #include <dev/usb/usbdi_util.h>
  68 #include <dev/usb/usb_cdc.h>
  69 #include "usbdevs.h"
  70
  71 #define USB_DEBUG_VAR umcs_debug
  72 #include <dev/usb/usb_debug.h>
  73 #include <dev/usb/usb_process.h>
  74
  75 #include <dev/usb/serial/usb_serial.h>
  76
  77 #include <dev/usb/serial/umcs.h>
  78
  79 #define UMCS7840_MODVER 1
  80
  81 #ifdef USB_DEBUG
  82 static int umcs_debug = 0;
  83
  84 static SYSCTL_NODE(_hw_usb, OID_AUTO, umcs, CTLFLAG_RW, 0, "USB umcs quadport serial adapter");
  85 SYSCTL_INT(_hw_usb_umcs, OID_AUTO, debug, CTLFLAG_RWTUN, &umcs_debug, 0, "Debug level");
  86 #endif                                  /* USB_DEBUG */
  87
  88
  89 /*
  90  * Two-port devices (both with 7820 chip and 7840 chip configured as two-port)
  91  * have ports 0 and 2, with ports 1 and 3 omitted.
  92  * So,PHYSICAL port numbers (indexes) on two-port device will be 0 and 2.
  93  * This driver trys to use physical numbers as much as possible.
  94  */
  95
  96 /*
  97  * Indexed by PHYSICAL port number.
  98  * Pack non-regular registers to array to easier if-less access.
  99  */
 100 struct umcs7840_port_registers {
 101         uint8_t reg_sp;                 /* SP register. */
 102         uint8_t reg_control;            /* CONTROL register. */
 103         uint8_t reg_dcr;                /* DCR0 register. DCR1 & DCR2 can be
 104                                          * calculated */
 105 };
 106
 107 static const struct umcs7840_port_registers umcs7840_port_registers[UMCS7840_MAX_PORTS] = {
 108         {.reg_sp = MCS7840_DEV_REG_SP1,.reg_control = MCS7840_DEV_REG_CONTROL1,.reg_dcr = MCS7840_DEV_REG_DCR0_1},
 109         {.reg_sp = MCS7840_DEV_REG_SP2,.reg_control = MCS7840_DEV_REG_CONTROL2,.reg_dcr = MCS7840_DEV_REG_DCR0_2},
 110         {.reg_sp = MCS7840_DEV_REG_SP3,.reg_control = MCS7840_DEV_REG_CONTROL3,.reg_dcr = MCS7840_DEV_REG_DCR0_3},
 111         {.reg_sp = MCS7840_DEV_REG_SP4,.reg_control = MCS7840_DEV_REG_CONTROL4,.reg_dcr = MCS7840_DEV_REG_DCR0_4},
 112 };
 113
 114 enum {
 115         UMCS7840_BULK_RD_EP,
 116         UMCS7840_BULK_WR_EP,
 117         UMCS7840_N_TRANSFERS
 118 };
 119
 120 struct umcs7840_softc_oneport {
 121         struct usb_xfer *sc_xfer[UMCS7840_N_TRANSFERS]; /* Control structures
 122                                                          * for two transfers */
 123
 124         uint8_t sc_lcr;                 /* local line control register */
 125         uint8_t sc_mcr;                 /* local modem control register */
 126 };
 127
 128 struct umcs7840_softc {
 129         struct ucom_super_softc sc_super_ucom;
 130         struct ucom_softc sc_ucom[UMCS7840_MAX_PORTS];  /* Need to be continuous
 131                                                          * array, so indexed by
 132                                                          * LOGICAL port
 133                                                          * (subunit) number */
 134
 135         struct usb_xfer *sc_intr_xfer;  /* Interrupt endpoint */
 136
 137         device_t sc_dev;                /* Device for error prints */
 138         struct usb_device *sc_udev;     /* USB Device for all operations */
 139         struct mtx sc_mtx;              /* ucom requires this */
 140
 141         uint8_t sc_driver_done;         /* Flag when enumeration is finished */
 142
 143         uint8_t sc_numports;            /* Number of ports (subunits) */
 144         struct umcs7840_softc_oneport sc_ports[UMCS7840_MAX_PORTS];     /* Indexed by PHYSICAL
 145                                                                          * port number. */
 146 };
 147
 148 /* prototypes */
 149 static usb_error_t umcs7840_get_reg_sync(struct umcs7840_softc *, uint8_t, uint8_t *);
 150 static usb_error_t umcs7840_set_reg_sync(struct umcs7840_softc *, uint8_t, uint8_t);
 151 static usb_error_t umcs7840_get_UART_reg_sync(struct umcs7840_softc *, uint8_t, uint8_t, uint8_t *);
 152 static usb_error_t umcs7840_set_UART_reg_sync(struct umcs7840_softc *, uint8_t, uint8_t, uint8_t);
 153
 154 static usb_error_t umcs7840_set_baudrate(struct umcs7840_softc *, uint8_t, uint32_t);
 155 static usb_error_t umcs7840_calc_baudrate(uint32_t rate, uint16_t *, uint8_t *);
 156
 157 static void     umcs7840_free(struct ucom_softc *);
 158 static void umcs7840_cfg_get_status(struct ucom_softc *, uint8_t *, uint8_t *);
 159 static void umcs7840_cfg_set_dtr(struct ucom_softc *, uint8_t);
 160 static void umcs7840_cfg_set_rts(struct ucom_softc *, uint8_t);
 161 static void umcs7840_cfg_set_break(struct ucom_softc *, uint8_t);
 162 static void umcs7840_cfg_param(struct ucom_softc *, struct termios *);
 163 static void umcs7840_cfg_open(struct ucom_softc *);
 164 static void umcs7840_cfg_close(struct ucom_softc *);
 165
 166 static int umcs7840_pre_param(struct ucom_softc *, struct termios *);
 167
 168 static void umcs7840_start_read(struct ucom_softc *);
 169 static void umcs7840_stop_read(struct ucom_softc *);
 170
 171 static void umcs7840_start_write(struct ucom_softc *);
 172 static void umcs7840_stop_write(struct ucom_softc *);
 173
 174 static void umcs7840_poll(struct ucom_softc *ucom);
 175
 176 static device_probe_t umcs7840_probe;
 177 static device_attach_t umcs7840_attach;
 178 static device_detach_t umcs7840_detach;
 179 static void umcs7840_free_softc(struct umcs7840_softc *);
 180
 181 static usb_callback_t umcs7840_intr_callback;
 182 static usb_callback_t umcs7840_read_callback1;
 183 static usb_callback_t umcs7840_read_callback2;
 184 static usb_callback_t umcs7840_read_callback3;
 185 static usb_callback_t umcs7840_read_callback4;
 186 static usb_callback_t umcs7840_write_callback1;
 187 static usb_callback_t umcs7840_write_callback2;
 188 static usb_callback_t umcs7840_write_callback3;
 189 static usb_callback_t umcs7840_write_callback4;
 190
 191 static void umcs7840_read_callbackN(struct usb_xfer *, usb_error_t, uint8_t);
 192 static void umcs7840_write_callbackN(struct usb_xfer *, usb_error_t, uint8_t);
 193
 194 /* Indexed by LOGICAL port number (subunit), so two-port device uses 0 & 1 */
 195 static usb_callback_t *umcs7840_rw_callbacks[UMCS7840_MAX_PORTS][UMCS7840_N_TRANSFERS] = {
 196         {&umcs7840_read_callback1, &umcs7840_write_callback1},
 197         {&umcs7840_read_callback2, &umcs7840_write_callback2},
 198         {&umcs7840_read_callback3, &umcs7840_write_callback3},
 199         {&umcs7840_read_callback4, &umcs7840_write_callback4},
 200 };
 201
 202 static const struct usb_config umcs7840_bulk_config_data[UMCS7840_N_TRANSFERS] = {
 203         [UMCS7840_BULK_RD_EP] = {
 204                 .type = UE_BULK,
 205                 .endpoint = 0x01,
 206                 .direction = UE_DIR_IN,
 207                 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
 208                 .bufsize = 0,           /* use wMaxPacketSize */
 209                 .callback = &umcs7840_read_callback1,
 210                 .if_index = 0,
 211         },
 212
 213         [UMCS7840_BULK_WR_EP] = {
 214                 .type = UE_BULK,
 215                 .endpoint = 0x02,
 216                 .direction = UE_DIR_OUT,
 217                 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
 218                 .bufsize = 0,           /* use wMaxPacketSize */
 219                 .callback = &umcs7840_write_callback1,
 220                 .if_index = 0,
 221         },
 222 };
 223
 224 static const struct usb_config umcs7840_intr_config_data[1] = {
 225         [0] = {
 226                 .type = UE_INTERRUPT,
 227                 .endpoint = 0x09,
 228                 .direction = UE_DIR_IN,
 229                 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
 230                 .bufsize = 0,           /* use wMaxPacketSize */
 231                 .callback = &umcs7840_intr_callback,
 232                 .if_index = 0,
 233         },
 234 };
 235
 236 static struct ucom_callback umcs7840_callback = {
 237         .ucom_cfg_get_status = &umcs7840_cfg_get_status,
 238
 239         .ucom_cfg_set_dtr = &umcs7840_cfg_set_dtr,
 240         .ucom_cfg_set_rts = &umcs7840_cfg_set_rts,
 241         .ucom_cfg_set_break = &umcs7840_cfg_set_break,
 242
 243         .ucom_cfg_param = &umcs7840_cfg_param,
 244         .ucom_cfg_open = &umcs7840_cfg_open,
 245         .ucom_cfg_close = &umcs7840_cfg_close,
 246
 247         .ucom_pre_param = &umcs7840_pre_param,
 248
 249         .ucom_start_read = &umcs7840_start_read,
 250         .ucom_stop_read = &umcs7840_stop_read,
 251
 252         .ucom_start_write = &umcs7840_start_write,
 253         .ucom_stop_write = &umcs7840_stop_write,
 254
 255         .ucom_poll = &umcs7840_poll,
 256         .ucom_free = &umcs7840_free,
 257 };
 258
 259 static const STRUCT_USB_HOST_ID umcs7840_devs[] = {
 260         {USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7820, 0)},
 261         {USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7840, 0)},
 262 };
 263
 264 static device_method_t umcs7840_methods[] = {
 265         DEVMETHOD(device_probe, umcs7840_probe),
 266         DEVMETHOD(device_attach, umcs7840_attach),
 267         DEVMETHOD(device_detach, umcs7840_detach),
 268         DEVMETHOD_END
 269 };
 270
 271 static devclass_t umcs7840_devclass;
 272
 273 static driver_t umcs7840_driver = {
 274         .name = "umcs7840",
 275         .methods = umcs7840_methods,
 276         .size = sizeof(struct umcs7840_softc),
 277 };
 278
 279 DRIVER_MODULE(umcs7840, uhub, umcs7840_driver, umcs7840_devclass, 0, 0);
 280 MODULE_DEPEND(umcs7840, ucom, 1, 1, 1);
 281 MODULE_DEPEND(umcs7840, usb, 1, 1, 1);
 282 MODULE_VERSION(umcs7840, UMCS7840_MODVER);
 283 USB_PNP_HOST_INFO(umcs7840_devs);
 284
 285 static int
 286 umcs7840_probe(device_t dev)
 287 {
 288         struct usb_attach_arg *uaa = device_get_ivars(dev);
 289
 290         if (uaa->usb_mode != USB_MODE_HOST)
 291                 return (ENXIO);
 292         if (uaa->info.bConfigIndex != MCS7840_CONFIG_INDEX)
 293                 return (ENXIO);
 294         if (uaa->info.bIfaceIndex != MCS7840_IFACE_INDEX)
 295                 return (ENXIO);
 296         return (usbd_lookup_id_by_uaa(umcs7840_devs, sizeof(umcs7840_devs), uaa));
 297 }
 298
 299 static int
 300 umcs7840_attach(device_t dev)
 301 {
 302         struct usb_config umcs7840_config_tmp[UMCS7840_N_TRANSFERS];
 303         struct usb_attach_arg *uaa = device_get_ivars(dev);
 304         struct umcs7840_softc *sc = device_get_softc(dev);
 305
 306         uint8_t iface_index = MCS7840_IFACE_INDEX;
 307         int error;
 308         int subunit;
 309         int n;
 310         uint8_t data;
 311
 312         for (n = 0; n < UMCS7840_N_TRANSFERS; ++n)
 313                 umcs7840_config_tmp[n] = umcs7840_bulk_config_data[n];
 314
 315         device_set_usb_desc(dev);
 316         mtx_init(&sc->sc_mtx, "umcs7840", NULL, MTX_DEF);
 317         ucom_ref(&sc->sc_super_ucom);
 318
 319         sc->sc_dev = dev;
 320         sc->sc_udev = uaa->device;
 321
 322         /*
 323          * Get number of ports
 324          * Documentation (full datasheet) says, that number of ports is
 325          * set as MCS7840_DEV_MODE_SELECT24S bit in MODE R/Only
 326          * register. But vendor driver uses these undocumented
 327          * register & bit.
 328          *
 329          * Experiments show, that MODE register can have `0'
 330          * (4 ports) bit on 2-port device, so use vendor driver's way.
 331          *
 332          * Also, see notes in header file for these constants.
 333          */
 334         umcs7840_get_reg_sync(sc, MCS7840_DEV_REG_GPIO, &data);
 335         if (data & MCS7840_DEV_GPIO_4PORTS) {
 336                 sc->sc_numports = 4;
 337                 /* Store physical port numbers in sc_portno */
 338                 sc->sc_ucom[0].sc_portno = 0;
 339                 sc->sc_ucom[1].sc_portno = 1;
 340                 sc->sc_ucom[2].sc_portno = 2;
 341                 sc->sc_ucom[3].sc_portno = 3;
 342         } else {
 343                 sc->sc_numports = 2;
 344                 /* Store physical port numbers in sc_portno */
 345                 sc->sc_ucom[0].sc_portno = 0;
 346                 sc->sc_ucom[1].sc_portno = 2;   /* '1' is skipped */
 347         }
 348         device_printf(dev, "Chip mcs%04x, found %d active ports\n", uaa->info.idProduct, sc->sc_numports);
 349         if (!umcs7840_get_reg_sync(sc, MCS7840_DEV_REG_MODE, &data)) {
 350                 device_printf(dev, "On-die confguration: RST: active %s, HRD: %s, PLL: %s, POR: %s, Ports: %s, EEPROM write %s, IrDA is %savailable\n",
 351                     (data & MCS7840_DEV_MODE_RESET) ? "low" : "high",
 352                     (data & MCS7840_DEV_MODE_SER_PRSNT) ? "yes" : "no",
 353                     (data & MCS7840_DEV_MODE_PLLBYPASS) ? "bypassed" : "avail",
 354                     (data & MCS7840_DEV_MODE_PORBYPASS) ? "bypassed" : "avail",
 355                     (data & MCS7840_DEV_MODE_SELECT24S) ? "2" : "4",
 356                     (data & MCS7840_DEV_MODE_EEPROMWR) ? "enabled" : "disabled",
 357                     (data & MCS7840_DEV_MODE_IRDA) ? "" : "not ");
 358         }
 359         /* Setup all transfers */
 360         for (subunit = 0; subunit < sc->sc_numports; ++subunit) {
 361                 for (n = 0; n < UMCS7840_N_TRANSFERS; ++n) {
 362                         /* Set endpoint address */
 363                         umcs7840_config_tmp[n].endpoint = umcs7840_bulk_config_data[n].endpoint + 2 * sc->sc_ucom[subunit].sc_portno;
 364                         umcs7840_config_tmp[n].callback = umcs7840_rw_callbacks[subunit][n];
 365                 }
 366                 error = usbd_transfer_setup(uaa->device,
 367                     &iface_index, sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer, umcs7840_config_tmp,
 368                     UMCS7840_N_TRANSFERS, sc, &sc->sc_mtx);
 369                 if (error) {
 370                         device_printf(dev, "allocating USB transfers failed for subunit %d of %d\n",
 371                             subunit + 1, sc->sc_numports);
 372                         goto detach;
 373                 }
 374         }
 375         error = usbd_transfer_setup(uaa->device,
 376             &iface_index, &sc->sc_intr_xfer, umcs7840_intr_config_data,
 377             1, sc, &sc->sc_mtx);
 378         if (error) {
 379                 device_printf(dev, "allocating USB transfers failed for interrupt\n");
 380                 goto detach;
 381         }
 382         /* clear stall at first run */
 383         mtx_lock(&sc->sc_mtx);
 384         for (subunit = 0; subunit < sc->sc_numports; ++subunit) {
 385                 usbd_xfer_set_stall(sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer[UMCS7840_BULK_RD_EP]);
 386                 usbd_xfer_set_stall(sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer[UMCS7840_BULK_WR_EP]);
 387         }
 388         mtx_unlock(&sc->sc_mtx);
 389
 390         error = ucom_attach(&sc->sc_super_ucom, sc->sc_ucom, sc->sc_numports, sc,
 391             &umcs7840_callback, &sc->sc_mtx);
 392         if (error)
 393                 goto detach;
 394
 395         ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
 396
 397         return (0);
 398
 399 detach:
 400         umcs7840_detach(dev);
 401         return (ENXIO);
 402 }
 403
 404 static int
 405 umcs7840_detach(device_t dev)
 406 {
 407         struct umcs7840_softc *sc = device_get_softc(dev);
 408         int subunit;
 409
 410         ucom_detach(&sc->sc_super_ucom, sc->sc_ucom);
 411
 412         for (subunit = 0; subunit < sc->sc_numports; ++subunit)
 413                 usbd_transfer_unsetup(sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer, UMCS7840_N_TRANSFERS);
 414         usbd_transfer_unsetup(&sc->sc_intr_xfer, 1);
 415
 416         device_claim_softc(dev);
 417
 418         umcs7840_free_softc(sc);
 419
 420         return (0);
 421 }
 422
 423 UCOM_UNLOAD_DRAIN(umcs7840);
 424
 425 static void
 426 umcs7840_free_softc(struct umcs7840_softc *sc)
 427 {
 428         if (ucom_unref(&sc->sc_super_ucom)) {
 429                 mtx_destroy(&sc->sc_mtx);
 430                 device_free_softc(sc);
 431         }
 432 }
 433
 434 static void
 435 umcs7840_free(struct ucom_softc *ucom)
 436 {
 437         umcs7840_free_softc(ucom->sc_parent);
 438 }
 439
 440 static void
 441 umcs7840_cfg_open(struct ucom_softc *ucom)
 442 {
 443         struct umcs7840_softc *sc = ucom->sc_parent;
 444         uint16_t pn = ucom->sc_portno;
 445         uint8_t data;
 446
 447         /* If it very first open, finish global configuration */
 448         if (!sc->sc_driver_done) {
 449                 /*
 450                  * USB enumeration is finished, pass internal memory to FIFOs
 451                  * If it is done in the end of "attach", kernel panics.
 452                  */
 453                 if (umcs7840_get_reg_sync(sc, MCS7840_DEV_REG_CONTROL1, &data))
 454                         return;
 455                 data |= MCS7840_DEV_CONTROL1_DRIVER_DONE;
 456                 if (umcs7840_set_reg_sync(sc, MCS7840_DEV_REG_CONTROL1, data))
 457                         return;
 458                 sc->sc_driver_done = 1;
 459         }
 460         /* Toggle reset bit on-off */
 461         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, &data))
 462                 return;
 463         data |= MCS7840_DEV_SPx_UART_RESET;
 464         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, data))
 465                 return;
 466         data &= ~MCS7840_DEV_SPx_UART_RESET;
 467         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, data))
 468                 return;
 469
 470         /* Set RS-232 mode */
 471         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_SCRATCHPAD, MCS7840_UART_SCRATCHPAD_RS232))
 472                 return;
 473
 474         /* Disable RX on time of initialization */
 475         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_control, &data))
 476                 return;
 477         data |= MCS7840_DEV_CONTROLx_RX_DISABLE;
 478         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_control, data))
 479                 return;
 480
 481         /* Disable all interrupts */
 482         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_IER, 0))
 483                 return;
 484
 485         /* Reset FIFO -- documented */
 486         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_FCR, 0))
 487                 return;
 488         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_FCR,
 489             MCS7840_UART_FCR_ENABLE | MCS7840_UART_FCR_FLUSHRHR |
 490             MCS7840_UART_FCR_FLUSHTHR | MCS7840_UART_FCR_RTL_1_14))
 491                 return;
 492
 493         /* Set 8 bit, no parity, 1 stop bit -- documented */
 494         sc->sc_ports[pn].sc_lcr = MCS7840_UART_LCR_DATALEN8 | MCS7840_UART_LCR_STOPB1;
 495         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, sc->sc_ports[pn].sc_lcr))
 496                 return;
 497
 498         /*
 499          * Enable DTR/RTS on modem control, enable modem interrupts --
 500          * documented
 501          */
 502         sc->sc_ports[pn].sc_mcr = MCS7840_UART_MCR_DTR | MCS7840_UART_MCR_RTS | MCS7840_UART_MCR_IE;
 503         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr))
 504                 return;
 505
 506         /* Clearing Bulkin and Bulkout FIFO */
 507         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, &data))
 508                 return;
 509         data |= MCS7840_DEV_SPx_RESET_OUT_FIFO | MCS7840_DEV_SPx_RESET_IN_FIFO;
 510         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, data))
 511                 return;
 512         data &= ~(MCS7840_DEV_SPx_RESET_OUT_FIFO | MCS7840_DEV_SPx_RESET_IN_FIFO);
 513         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, data))
 514                 return;
 515
 516         /* Set speed 9600 */
 517         if (umcs7840_set_baudrate(sc, pn, 9600))
 518                 return;
 519
 520
 521         /* Finally enable all interrupts -- documented */
 522         /*
 523          * Copied from vendor driver, I don't know why we should read LCR
 524          * here
 525          */
 526         if (umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, &sc->sc_ports[pn].sc_lcr))
 527                 return;
 528         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_IER,
 529             MCS7840_UART_IER_RXSTAT | MCS7840_UART_IER_MODEM))
 530                 return;
 531
 532         /* Enable RX */
 533         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_control, &data))
 534                 return;
 535         data &= ~MCS7840_DEV_CONTROLx_RX_DISABLE;
 536         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_control, data))
 537                 return;
 538
 539         DPRINTF("Port %d has been opened\n", pn);
 540 }
 541
 542 static void
 543 umcs7840_cfg_close(struct ucom_softc *ucom)
 544 {
 545         struct umcs7840_softc *sc = ucom->sc_parent;
 546         uint16_t pn = ucom->sc_portno;
 547         uint8_t data;
 548
 549         umcs7840_stop_read(ucom);
 550         umcs7840_stop_write(ucom);
 551
 552         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, 0);
 553         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_IER, 0);
 554
 555         /* Disable RX */
 556         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_control, &data))
 557                 return;
 558         data |= MCS7840_DEV_CONTROLx_RX_DISABLE;
 559         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_control, data))
 560                 return;
 561         DPRINTF("Port %d has been closed\n", pn);
 562 }
 563
 564 static void
 565 umcs7840_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
 566 {
 567         struct umcs7840_softc *sc = ucom->sc_parent;
 568         uint8_t pn = ucom->sc_portno;
 569
 570         if (onoff)
 571                 sc->sc_ports[pn].sc_mcr |= MCS7840_UART_MCR_DTR;
 572         else
 573                 sc->sc_ports[pn].sc_mcr &= ~MCS7840_UART_MCR_DTR;
 574
 575         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr);
 576         DPRINTF("Port %d DTR set to: %s\n", pn, onoff ? "on" : "off");
 577 }
 578
 579 static void
 580 umcs7840_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
 581 {
 582         struct umcs7840_softc *sc = ucom->sc_parent;
 583         uint8_t pn = ucom->sc_portno;
 584
 585         if (onoff)
 586                 sc->sc_ports[pn].sc_mcr |= MCS7840_UART_MCR_RTS;
 587         else
 588                 sc->sc_ports[pn].sc_mcr &= ~MCS7840_UART_MCR_RTS;
 589
 590         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr);
 591         DPRINTF("Port %d RTS set to: %s\n", pn, onoff ? "on" : "off");
 592 }
 593
 594 static void
 595 umcs7840_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
 596 {
 597         struct umcs7840_softc *sc = ucom->sc_parent;
 598         uint8_t pn = ucom->sc_portno;
 599
 600         if (onoff)
 601                 sc->sc_ports[pn].sc_lcr |= MCS7840_UART_LCR_BREAK;
 602         else
 603                 sc->sc_ports[pn].sc_lcr &= ~MCS7840_UART_LCR_BREAK;
 604
 605         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, sc->sc_ports[pn].sc_lcr);
 606         DPRINTF("Port %d BREAK set to: %s\n", pn, onoff ? "on" : "off");
 607 }
 608
 609
 610 static void
 611 umcs7840_cfg_param(struct ucom_softc *ucom, struct termios *t)
 612 {
 613         struct umcs7840_softc *sc = ucom->sc_parent;
 614         uint8_t pn = ucom->sc_portno;
 615         uint8_t lcr = sc->sc_ports[pn].sc_lcr;
 616         uint8_t mcr = sc->sc_ports[pn].sc_mcr;
 617
 618         DPRINTF("Port %d config:\n", pn);
 619         if (t->c_cflag & CSTOPB) {
 620                 DPRINTF("  2 stop bits\n");
 621                 lcr |= MCS7840_UART_LCR_STOPB2;
 622         } else {
 623                 lcr |= MCS7840_UART_LCR_STOPB1;
 624                 DPRINTF("  1 stop bit\n");
 625         }
 626
 627         lcr &= ~MCS7840_UART_LCR_PARITYMASK;
 628         if (t->c_cflag & PARENB) {
 629                 lcr |= MCS7840_UART_LCR_PARITYON;
 630                 if (t->c_cflag & PARODD) {
 631                         lcr = MCS7840_UART_LCR_PARITYODD;
 632                         DPRINTF("  parity on - odd\n");
 633                 } else {
 634                         lcr = MCS7840_UART_LCR_PARITYEVEN;
 635                         DPRINTF("  parity on - even\n");
 636                 }
 637         } else {
 638                 lcr &= ~MCS7840_UART_LCR_PARITYON;
 639                 DPRINTF("  parity off\n");
 640         }
 641
 642         lcr &= ~MCS7840_UART_LCR_DATALENMASK;
 643         switch (t->c_cflag & CSIZE) {
 644         case CS5:
 645                 lcr |= MCS7840_UART_LCR_DATALEN5;
 646                 DPRINTF("  5 bit\n");
 647                 break;
 648         case CS6:
 649                 lcr |= MCS7840_UART_LCR_DATALEN6;
 650                 DPRINTF("  6 bit\n");
 651                 break;
 652         case CS7:
 653                 lcr |= MCS7840_UART_LCR_DATALEN7;
 654                 DPRINTF("  7 bit\n");
 655                 break;
 656         case CS8:
 657                 lcr |= MCS7840_UART_LCR_DATALEN8;
 658                 DPRINTF("  8 bit\n");
 659                 break;
 660         }
 661
 662         if (t->c_cflag & CRTSCTS) {
 663                 mcr |= MCS7840_UART_MCR_CTSRTS;
 664                 DPRINTF("  CTS/RTS\n");
 665         } else
 666                 mcr &= ~MCS7840_UART_MCR_CTSRTS;
 667
 668         if (t->c_cflag & (CDTR_IFLOW | CDSR_OFLOW)) {
 669                 mcr |= MCS7840_UART_MCR_DTRDSR;
 670                 DPRINTF("  DTR/DSR\n");
 671         } else
 672                 mcr &= ~MCS7840_UART_MCR_DTRDSR;
 673
 674         sc->sc_ports[pn].sc_lcr = lcr;
 675         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, sc->sc_ports[pn].sc_lcr);
 676         DPRINTF("Port %d LCR=%02x\n", pn, sc->sc_ports[pn].sc_lcr);
 677
 678         sc->sc_ports[pn].sc_mcr = mcr;
 679         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr);
 680         DPRINTF("Port %d MCR=%02x\n", pn, sc->sc_ports[pn].sc_mcr);
 681
 682         umcs7840_set_baudrate(sc, pn, t->c_ospeed);
 683 }
 684
 685
 686 static int
 687 umcs7840_pre_param(struct ucom_softc *ucom, struct termios *t)
 688 {
 689         uint8_t clk;
 690         uint16_t divisor;
 691
 692         if (umcs7840_calc_baudrate(t->c_ospeed, &divisor, &clk) || !divisor)
 693                 return (EINVAL);
 694         return (0);
 695 }
 696
 697 static void
 698 umcs7840_start_read(struct ucom_softc *ucom)
 699 {
 700         struct umcs7840_softc *sc = ucom->sc_parent;
 701         uint8_t pn = ucom->sc_portno;
 702
 703         /* Start interrupt transfer */
 704         usbd_transfer_start(sc->sc_intr_xfer);
 705
 706         /* Start read transfer */
 707         usbd_transfer_start(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_RD_EP]);
 708 }
 709
 710 static void
 711 umcs7840_stop_read(struct ucom_softc *ucom)
 712 {
 713         struct umcs7840_softc *sc = ucom->sc_parent;
 714         uint8_t pn = ucom->sc_portno;
 715
 716         /* Stop read transfer */
 717         usbd_transfer_stop(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_RD_EP]);
 718 }
 719
 720 static void
 721 umcs7840_start_write(struct ucom_softc *ucom)
 722 {
 723         struct umcs7840_softc *sc = ucom->sc_parent;
 724         uint8_t pn = ucom->sc_portno;
 725
 726         /* Start interrupt transfer */
 727         usbd_transfer_start(sc->sc_intr_xfer);
 728
 729         /* Start write transfer */
 730         usbd_transfer_start(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_WR_EP]);
 731 }
 732
 733 static void
 734 umcs7840_stop_write(struct ucom_softc *ucom)
 735 {
 736         struct umcs7840_softc *sc = ucom->sc_parent;
 737         uint8_t pn = ucom->sc_portno;
 738
 739         /* Stop write transfer */
 740         usbd_transfer_stop(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_WR_EP]);
 741 }
 742
 743 static void
 744 umcs7840_cfg_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
 745 {
 746         struct umcs7840_softc *sc = ucom->sc_parent;
 747         uint8_t pn = ucom->sc_portno;
 748         uint8_t hw_msr = 0;     /* local modem status register */
 749
 750         /*
 751          * Read status registers.  MSR bits need translation from ns16550 to
 752          * SER_* values.  LSR bits are ns16550 in hardware and ucom.
 753          */
 754         umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_LSR, lsr);
 755         umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_MSR, &hw_msr);
 756
 757         if (hw_msr & MCS7840_UART_MSR_NEGCTS)
 758                 *msr |= SER_CTS;
 759
 760         if (hw_msr & MCS7840_UART_MSR_NEGDCD)
 761                 *msr |= SER_DCD;
 762
 763         if (hw_msr & MCS7840_UART_MSR_NEGRI)
 764                 *msr |= SER_RI;
 765
 766         if (hw_msr & MCS7840_UART_MSR_NEGDSR)
 767                 *msr |= SER_DSR;
 768
 769         DPRINTF("Port %d status: LSR=%02x MSR=%02x\n", ucom->sc_portno, *lsr, *msr);
 770 }
 771
 772 static void
 773 umcs7840_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 774 {
 775         struct umcs7840_softc *sc = usbd_xfer_softc(xfer);
 776         struct usb_page_cache *pc;
 777         uint8_t buf[13];
 778         int actlen;
 779         int subunit;
 780
 781         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 782
 783         switch (USB_GET_STATE(xfer)) {
 784         case USB_ST_TRANSFERRED:
 785                 if (actlen == 5 || actlen == 13) {
 786                         pc = usbd_xfer_get_frame(xfer, 0);
 787                         usbd_copy_out(pc, 0, buf, actlen);
 788                         /* Check status of all ports */
 789                         for (subunit = 0; subunit < sc->sc_numports; ++subunit) {
 790                                 uint8_t pn = sc->sc_ucom[subunit].sc_portno;
 791
 792                                 if (buf[pn] & MCS7840_UART_ISR_NOPENDING)
 793                                         continue;
 794                                 DPRINTF("Port %d has pending interrupt: %02x (FIFO: %02x)\n", pn, buf[pn] & MCS7840_UART_ISR_INTMASK, buf[pn] & (~MCS7840_UART_ISR_INTMASK));
 795                                 switch (buf[pn] & MCS7840_UART_ISR_INTMASK) {
 796                                 case MCS7840_UART_ISR_RXERR:
 797                                 case MCS7840_UART_ISR_RXHASDATA:
 798                                 case MCS7840_UART_ISR_RXTIMEOUT:
 799                                 case MCS7840_UART_ISR_MSCHANGE:
 800                                         ucom_status_change(&sc->sc_ucom[subunit]);
 801                                         break;
 802                                 default:
 803                                         /* Do nothing */
 804                                         break;
 805                                 }
 806                         }
 807                 } else
 808                         device_printf(sc->sc_dev, "Invalid interrupt data length %d", actlen);
 809                 /* FALLTHROUGH */
 810         case USB_ST_SETUP:
 811 tr_setup:
 812                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 813                 usbd_transfer_submit(xfer);
 814                 return;
 815
 816         default:                        /* Error */
 817                 if (error != USB_ERR_CANCELLED) {
 818                         /* try to clear stall first */
 819                         usbd_xfer_set_stall(xfer);
 820                         goto tr_setup;
 821                 }
 822                 return;
 823         }
 824 }
 825
 826 static void
 827 umcs7840_read_callback1(struct usb_xfer *xfer, usb_error_t error)
 828 {
 829         umcs7840_read_callbackN(xfer, error, 0);
 830 }
 831
 832 static void
 833 umcs7840_read_callback2(struct usb_xfer *xfer, usb_error_t error)
 834 {
 835         umcs7840_read_callbackN(xfer, error, 1);
 836 }
 837 static void
 838 umcs7840_read_callback3(struct usb_xfer *xfer, usb_error_t error)
 839 {
 840         umcs7840_read_callbackN(xfer, error, 2);
 841 }
 842
 843 static void
 844 umcs7840_read_callback4(struct usb_xfer *xfer, usb_error_t error)
 845 {
 846         umcs7840_read_callbackN(xfer, error, 3);
 847 }
 848
 849 static void
 850 umcs7840_read_callbackN(struct usb_xfer *xfer, usb_error_t error, uint8_t subunit)
 851 {
 852         struct umcs7840_softc *sc = usbd_xfer_softc(xfer);
 853         struct ucom_softc *ucom = &sc->sc_ucom[subunit];
 854         struct usb_page_cache *pc;
 855         int actlen;
 856
 857         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 858
 859         DPRINTF("Port %d read, state = %d, data length = %d\n", ucom->sc_portno, USB_GET_STATE(xfer), actlen);
 860
 861         switch (USB_GET_STATE(xfer)) {
 862         case USB_ST_TRANSFERRED:
 863                 pc = usbd_xfer_get_frame(xfer, 0);
 864                 ucom_put_data(ucom, pc, 0, actlen);
 865                 /* FALLTHROUGH */
 866         case USB_ST_SETUP:
 867 tr_setup:
 868                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 869                 usbd_transfer_submit(xfer);
 870                 return;
 871
 872         default:                        /* Error */
 873                 if (error != USB_ERR_CANCELLED) {
 874                         /* try to clear stall first */
 875                         usbd_xfer_set_stall(xfer);
 876                         goto tr_setup;
 877                 }
 878                 return;
 879         }
 880 }
 881
 882 static void
 883 umcs7840_write_callback1(struct usb_xfer *xfer, usb_error_t error)
 884 {
 885         umcs7840_write_callbackN(xfer, error, 0);
 886 }
 887
 888 static void
 889 umcs7840_write_callback2(struct usb_xfer *xfer, usb_error_t error)
 890 {
 891         umcs7840_write_callbackN(xfer, error, 1);
 892 }
 893
 894 static void
 895 umcs7840_write_callback3(struct usb_xfer *xfer, usb_error_t error)
 896 {
 897         umcs7840_write_callbackN(xfer, error, 2);
 898 }
 899
 900 static void
 901 umcs7840_write_callback4(struct usb_xfer *xfer, usb_error_t error)
 902 {
 903         umcs7840_write_callbackN(xfer, error, 3);
 904 }
 905
 906 static void
 907 umcs7840_write_callbackN(struct usb_xfer *xfer, usb_error_t error, uint8_t subunit)
 908 {
 909         struct umcs7840_softc *sc = usbd_xfer_softc(xfer);
 910         struct ucom_softc *ucom = &sc->sc_ucom[subunit];
 911         struct usb_page_cache *pc;
 912         uint32_t actlen;
 913
 914         DPRINTF("Port %d write, state = %d\n", ucom->sc_portno, USB_GET_STATE(xfer));
 915
 916         switch (USB_GET_STATE(xfer)) {
 917         case USB_ST_SETUP:
 918         case USB_ST_TRANSFERRED:
 919 tr_setup:
 920                 pc = usbd_xfer_get_frame(xfer, 0);
 921                 if (ucom_get_data(ucom, pc, 0, usbd_xfer_max_len(xfer), &actlen)) {
 922                         DPRINTF("Port %d write, has %d bytes\n", ucom->sc_portno, actlen);
 923                         usbd_xfer_set_frame_len(xfer, 0, actlen);
 924                         usbd_transfer_submit(xfer);
 925                 }
 926                 return;
 927
 928         default:                        /* Error */
 929                 if (error != USB_ERR_CANCELLED) {
 930                         /* try to clear stall first */
 931                         usbd_xfer_set_stall(xfer);
 932                         goto tr_setup;
 933                 }
 934                 return;
 935         }
 936 }
 937
 938 static void
 939 umcs7840_poll(struct ucom_softc *ucom)
 940 {
 941         struct umcs7840_softc *sc = ucom->sc_parent;
 942
 943         DPRINTF("Port %d poll\n", ucom->sc_portno);
 944         usbd_transfer_poll(sc->sc_ports[ucom->sc_portno].sc_xfer, UMCS7840_N_TRANSFERS);
 945         usbd_transfer_poll(&sc->sc_intr_xfer, 1);
 946 }
 947
 948 static usb_error_t
 949 umcs7840_get_reg_sync(struct umcs7840_softc *sc, uint8_t reg, uint8_t *data)
 950 {
 951         struct usb_device_request req;
 952         usb_error_t err;
 953         uint16_t len;
 954
 955         req.bmRequestType = UT_READ_VENDOR_DEVICE;
 956         req.bRequest = MCS7840_RDREQ;
 957         USETW(req.wValue, 0);
 958         USETW(req.wIndex, reg);
 959         USETW(req.wLength, UMCS7840_READ_LENGTH);
 960
 961         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, (void *)data, 0, &len, UMCS7840_CTRL_TIMEOUT);
 962         if (err == USB_ERR_NORMAL_COMPLETION && len != 1) {
 963                 device_printf(sc->sc_dev, "Reading register %d failed: invalid length %d\n", reg, len);
 964                 return (USB_ERR_INVAL);
 965         } else if (err)
 966                 device_printf(sc->sc_dev, "Reading register %d failed: %s\n", reg, usbd_errstr(err));
 967         return (err);
 968 }
 969
 970 static usb_error_t
 971 umcs7840_set_reg_sync(struct umcs7840_softc *sc, uint8_t reg, uint8_t data)
 972 {
 973         struct usb_device_request req;
 974         usb_error_t err;
 975
 976         req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
 977         req.bRequest = MCS7840_WRREQ;
 978         USETW(req.wValue, data);
 979         USETW(req.wIndex, reg);
 980         USETW(req.wLength, 0);
 981
 982         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, NULL, 0, NULL, UMCS7840_CTRL_TIMEOUT);
 983         if (err)
 984                 device_printf(sc->sc_dev, "Writing register %d failed: %s\n", reg, usbd_errstr(err));
 985
 986         return (err);
 987 }
 988
 989 static usb_error_t
 990 umcs7840_get_UART_reg_sync(struct umcs7840_softc *sc, uint8_t portno, uint8_t reg, uint8_t *data)
 991 {
 992         struct usb_device_request req;
 993         uint16_t wVal;
 994         usb_error_t err;
 995         uint16_t len;
 996
 997         /* portno is port number */
 998         wVal = ((uint16_t)(portno + 1)) << 8;
 999
1000         req.bmRequestType = UT_READ_VENDOR_DEVICE;
1001         req.bRequest = MCS7840_RDREQ;
1002         USETW(req.wValue, wVal);
1003         USETW(req.wIndex, reg);
1004         USETW(req.wLength, UMCS7840_READ_LENGTH);
1005
1006         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, (void *)data, 0, &len, UMCS7840_CTRL_TIMEOUT);
1007         if (err == USB_ERR_NORMAL_COMPLETION && len != 1) {
1008                 device_printf(sc->sc_dev, "Reading UART%d register %d failed: invalid length %d\n", portno, reg, len);
1009                 return (USB_ERR_INVAL);
1010         } else if (err)
1011                 device_printf(sc->sc_dev, "Reading UART%d register %d failed: %s\n", portno, reg, usbd_errstr(err));
1012         return (err);
1013 }
1014
1015 static usb_error_t
1016 umcs7840_set_UART_reg_sync(struct umcs7840_softc *sc, uint8_t portno, uint8_t reg, uint8_t data)
1017 {
1018         struct usb_device_request req;
1019         usb_error_t err;
1020         uint16_t wVal;
1021
1022         /* portno is port number */
1023         wVal = ((uint16_t)(portno + 1)) << 8 | data;
1024
1025         req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
1026         req.bRequest = MCS7840_WRREQ;
1027         USETW(req.wValue, wVal);
1028         USETW(req.wIndex, reg);
1029         USETW(req.wLength, 0);
1030
1031         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, NULL, 0, NULL, UMCS7840_CTRL_TIMEOUT);
1032         if (err)
1033                 device_printf(sc->sc_dev, "Writing UART%d register %d failed: %s\n", portno, reg, usbd_errstr(err));
1034         return (err);
1035 }
1036
1037 static usb_error_t
1038 umcs7840_set_baudrate(struct umcs7840_softc *sc, uint8_t portno, uint32_t rate)
1039 {
1040         usb_error_t err;
1041         uint16_t divisor;
1042         uint8_t clk;
1043         uint8_t data;
1044
1045         if (umcs7840_calc_baudrate(rate, &divisor, &clk)) {
1046                 DPRINTF("Port %d bad speed: %d\n", portno, rate);
1047                 return (-1);
1048         }
1049         if (divisor == 0 || (clk & MCS7840_DEV_SPx_CLOCK_MASK) != clk) {
1050                 DPRINTF("Port %d bad speed calculation: %d\n", portno, rate);
1051                 return (-1);
1052         }
1053         DPRINTF("Port %d set speed: %d (%02x / %d)\n", portno, rate, clk, divisor);
1054
1055         /* Set clock source for standard BAUD frequences */
1056         err = umcs7840_get_reg_sync(sc, umcs7840_port_registers[portno].reg_sp, &data);
1057         if (err)
1058                 return (err);
1059         data &= MCS7840_DEV_SPx_CLOCK_MASK;
1060         data |= clk;
1061         err = umcs7840_set_reg_sync(sc, umcs7840_port_registers[portno].reg_sp, data);
1062         if (err)
1063                 return (err);
1064
1065         /* Set divider */
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
1071         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_DLL, (uint8_t)(divisor & 0xff));
1072         if (err)
1073                 return (err);
1074         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_DLM, (uint8_t)((divisor >> 8) & 0xff));
1075         if (err)
1076                 return (err);
1077
1078         /* Turn off access to DLL/DLM registers of UART */
1079         sc->sc_ports[portno].sc_lcr &= ~MCS7840_UART_LCR_DIVISORS;
1080         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_LCR, sc->sc_ports[portno].sc_lcr);
1081         if (err)
1082                 return (err);
1083         return (0);
1084 }
1085
1086 /* Maximum speeds for standard frequences, when PLL is not used */
1087 static const uint32_t umcs7840_baudrate_divisors[] = {0, 115200, 230400, 403200, 460800, 806400, 921600, 1572864, 3145728,};
1088 static const uint8_t umcs7840_baudrate_divisors_len = nitems(umcs7840_baudrate_divisors);
1089
1090 static usb_error_t
1091 umcs7840_calc_baudrate(uint32_t rate, uint16_t *divisor, uint8_t *clk)
1092 {
1093         uint8_t i = 0;
1094
1095         if (rate > umcs7840_baudrate_divisors[umcs7840_baudrate_divisors_len - 1])
1096                 return (-1);
1097
1098         for (i = 0; i < umcs7840_baudrate_divisors_len - 1 &&
1099             !(rate > umcs7840_baudrate_divisors[i] && rate <= umcs7840_baudrate_divisors[i + 1]); ++i);
1100         if (rate == 0)
1101                 *divisor = 1;   /* XXX */
1102         else
1103                 *divisor = umcs7840_baudrate_divisors[i + 1] / rate;
1104         /* 0x00 .. 0x70 */
1105         *clk = i << MCS7840_DEV_SPx_CLOCK_SHIFT;
1106         return (0);
1107 }