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 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_RW, &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         uint8_t sc_lsr;                 /* local line status register */
 125         uint8_t sc_msr;                 /* local modem status 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_cfg_get_status(struct ucom_softc *, uint8_t *, uint8_t *);
 158 static void umcs7840_cfg_set_dtr(struct ucom_softc *, uint8_t);
 159 static void umcs7840_cfg_set_rts(struct ucom_softc *, uint8_t);
 160 static void umcs7840_cfg_set_break(struct ucom_softc *, uint8_t);
 161 static void umcs7840_cfg_param(struct ucom_softc *, struct termios *);
 162 static void umcs7840_cfg_open(struct ucom_softc *);
 163 static void umcs7840_cfg_close(struct ucom_softc *);
 164
 165 static int umcs7840_pre_param(struct ucom_softc *, struct termios *);
 166
 167 static void umcs7840_start_read(struct ucom_softc *);
 168 static void umcs7840_stop_read(struct ucom_softc *);
 169
 170 static void umcs7840_start_write(struct ucom_softc *);
 171 static void umcs7840_stop_write(struct ucom_softc *);
 172
 173 static void umcs7840_poll(struct ucom_softc *ucom);
 174
 175 static device_probe_t umcs7840_probe;
 176 static device_attach_t umcs7840_attach;
 177 static device_detach_t umcs7840_detach;
 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 };
 255
 256 static const STRUCT_USB_HOST_ID umcs7840_devs[] = {
 257         {USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7820, 0)},
 258         {USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7840, 0)},
 259 };
 260
 261 static device_method_t umcs7840_methods[] = {
 262         DEVMETHOD(device_probe, umcs7840_probe),
 263         DEVMETHOD(device_attach, umcs7840_attach),
 264         DEVMETHOD(device_detach, umcs7840_detach),
 265         {0, 0}
 266 };
 267
 268 static devclass_t umcs7840_devclass;
 269
 270 static driver_t umcs7840_driver = {
 271         .name = "umcs7840",
 272         .methods = umcs7840_methods,
 273         .size = sizeof(struct umcs7840_softc),
 274 };
 275
 276 DRIVER_MODULE(umcs7840, uhub, umcs7840_driver, umcs7840_devclass, 0, 0);
 277 MODULE_DEPEND(umcs7840, ucom, 1, 1, 1);
 278 MODULE_DEPEND(umcs7840, usb, 1, 1, 1);
 279 MODULE_VERSION(umcs7840, UMCS7840_MODVER);
 280
 281 static int
 282 umcs7840_probe(device_t dev)
 283 {
 284         struct usb_attach_arg *uaa = device_get_ivars(dev);
 285
 286         if (uaa->usb_mode != USB_MODE_HOST)
 287                 return (ENXIO);
 288         if (uaa->info.bConfigIndex != MCS7840_CONFIG_INDEX)
 289                 return (ENXIO);
 290         if (uaa->info.bIfaceIndex != MCS7840_IFACE_INDEX)
 291                 return (ENXIO);
 292         return (usbd_lookup_id_by_uaa(umcs7840_devs, sizeof(umcs7840_devs), uaa));
 293 }
 294
 295 static int
 296 umcs7840_attach(device_t dev)
 297 {
 298         struct usb_config umcs7840_config_tmp[UMCS7840_N_TRANSFERS];
 299         struct usb_attach_arg *uaa = device_get_ivars(dev);
 300         struct umcs7840_softc *sc = device_get_softc(dev);
 301
 302         uint8_t iface_index = MCS7840_IFACE_INDEX;
 303         int error;
 304         int subunit;
 305         int n;
 306         uint8_t data;
 307
 308         for (n = 0; n < UMCS7840_N_TRANSFERS; ++n)
 309                 umcs7840_config_tmp[n] = umcs7840_bulk_config_data[n];
 310
 311         device_set_usb_desc(dev);
 312         mtx_init(&sc->sc_mtx, "umcs7840", NULL, MTX_DEF);
 313
 314         sc->sc_dev = dev;
 315         sc->sc_udev = uaa->device;
 316
 317         /*
 318          * Get number of ports
 319          * Documentation (full datasheet) says, that number of ports is
 320          * set as MCS7840_DEV_MODE_SELECT24S bit in MODE R/Only
 321          * register. But vendor driver uses these undocumented
 322          * register & bit.
 323          *
 324          * Experiments show, that MODE register can have `0'
 325          * (4 ports) bit on 2-port device, so use vendor driver's way.
 326          *
 327          * Also, see notes in header file for these constants.
 328          */
 329         umcs7840_get_reg_sync(sc, MCS7840_DEV_REG_GPIO, &data);
 330         if (data & MCS7840_DEV_GPIO_4PORTS) {
 331                 sc->sc_numports = 4;
 332                 /* Store physical port numbers in sc_portno */
 333                 sc->sc_ucom[0].sc_portno = 0;
 334                 sc->sc_ucom[1].sc_portno = 1;
 335                 sc->sc_ucom[2].sc_portno = 2;
 336                 sc->sc_ucom[3].sc_portno = 3;
 337         } else {
 338                 sc->sc_numports = 2;
 339                 /* Store physical port numbers in sc_portno */
 340                 sc->sc_ucom[0].sc_portno = 0;
 341                 sc->sc_ucom[1].sc_portno = 2;   /* '1' is skipped */
 342         }
 343         device_printf(dev, "Chip mcs%04x, found %d active ports\n", uaa->info.idProduct, sc->sc_numports);
 344         if (!umcs7840_get_reg_sync(sc, MCS7840_DEV_REG_MODE, &data)) {
 345                 device_printf(dev, "On-die confguration: RST: active %s, HRD: %s, PLL: %s, POR: %s, Ports: %s, EEPROM write %s, IrDA is %savailable\n",
 346                     (data & MCS7840_DEV_MODE_RESET) ? "low" : "high",
 347                     (data & MCS7840_DEV_MODE_SER_PRSNT) ? "yes" : "no",
 348                     (data & MCS7840_DEV_MODE_PLLBYPASS) ? "bypassed" : "avail",
 349                     (data & MCS7840_DEV_MODE_PORBYPASS) ? "bypassed" : "avail",
 350                     (data & MCS7840_DEV_MODE_SELECT24S) ? "2" : "4",
 351                     (data & MCS7840_DEV_MODE_EEPROMWR) ? "enabled" : "disabled",
 352                     (data & MCS7840_DEV_MODE_IRDA) ? "" : "not ");
 353         }
 354         /* Setup all transfers */
 355         for (subunit = 0; subunit < sc->sc_numports; ++subunit) {
 356                 for (n = 0; n < UMCS7840_N_TRANSFERS; ++n) {
 357                         /* Set endpoint address */
 358                         umcs7840_config_tmp[n].endpoint = umcs7840_bulk_config_data[n].endpoint + 2 * sc->sc_ucom[subunit].sc_portno;
 359                         umcs7840_config_tmp[n].callback = umcs7840_rw_callbacks[subunit][n];
 360                 }
 361                 error = usbd_transfer_setup(uaa->device,
 362                     &iface_index, sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer, umcs7840_config_tmp,
 363                     UMCS7840_N_TRANSFERS, sc, &sc->sc_mtx);
 364                 if (error) {
 365                         device_printf(dev, "allocating USB transfers failed for subunit %d of %d\n",
 366                             subunit + 1, sc->sc_numports);
 367                         goto detach;
 368                 }
 369         }
 370         error = usbd_transfer_setup(uaa->device,
 371             &iface_index, &sc->sc_intr_xfer, umcs7840_intr_config_data,
 372             1, sc, &sc->sc_mtx);
 373         if (error) {
 374                 device_printf(dev, "allocating USB transfers failed for interrupt\n");
 375                 goto detach;
 376         }
 377         /* clear stall at first run */
 378         mtx_lock(&sc->sc_mtx);
 379         for (subunit = 0; subunit < sc->sc_numports; ++subunit) {
 380                 usbd_xfer_set_stall(sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer[UMCS7840_BULK_RD_EP]);
 381                 usbd_xfer_set_stall(sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer[UMCS7840_BULK_WR_EP]);
 382         }
 383         mtx_unlock(&sc->sc_mtx);
 384
 385         error = ucom_attach(&sc->sc_super_ucom, sc->sc_ucom, sc->sc_numports, sc,
 386             &umcs7840_callback, &sc->sc_mtx);
 387         if (error)
 388                 goto detach;
 389
 390         ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
 391
 392         return (0);
 393
 394 detach:
 395         umcs7840_detach(dev);
 396         return (ENXIO);
 397 }
 398
 399 static int
 400 umcs7840_detach(device_t dev)
 401 {
 402         struct umcs7840_softc *sc = device_get_softc(dev);
 403         int subunit;
 404
 405         ucom_detach(&sc->sc_super_ucom, sc->sc_ucom);
 406
 407         for (subunit = 0; subunit < sc->sc_numports; ++subunit)
 408                 usbd_transfer_unsetup(sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer, UMCS7840_N_TRANSFERS);
 409         usbd_transfer_unsetup(&sc->sc_intr_xfer, 1);
 410
 411         mtx_destroy(&sc->sc_mtx);
 412         return (0);
 413 }
 414
 415 static void
 416 umcs7840_cfg_open(struct ucom_softc *ucom)
 417 {
 418         struct umcs7840_softc *sc = ucom->sc_parent;
 419         uint16_t pn = ucom->sc_portno;
 420         uint8_t data;
 421
 422         /* If it very first open, finish global configuration */
 423         if (!sc->sc_driver_done) {
 424                 /*
 425                  * USB enumeration is finished, pass internal memory to FIFOs
 426                  * If it is done in the end of "attach", kernel panics.
 427                  */
 428                 if (umcs7840_get_reg_sync(sc, MCS7840_DEV_REG_CONTROL1, &data))
 429                         return;
 430                 data |= MCS7840_DEV_CONTROL1_DRIVER_DONE;
 431                 if (umcs7840_set_reg_sync(sc, MCS7840_DEV_REG_CONTROL1, data))
 432                         return;
 433                 sc->sc_driver_done = 1;
 434         }
 435         /* Toggle reset bit on-off */
 436         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, &data))
 437                 return;
 438         data |= MCS7840_DEV_SPx_UART_RESET;
 439         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, data))
 440                 return;
 441         data &= ~MCS7840_DEV_SPx_UART_RESET;
 442         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, data))
 443                 return;
 444
 445         /* Set RS-232 mode */
 446         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_SCRATCHPAD, MCS7840_UART_SCRATCHPAD_RS232))
 447                 return;
 448
 449         /* Disable RX on time of initialization */
 450         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_control, &data))
 451                 return;
 452         data |= MCS7840_DEV_CONTROLx_RX_DISABLE;
 453         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_control, data))
 454                 return;
 455
 456         /* Disable all interrupts */
 457         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_IER, 0))
 458                 return;
 459
 460         /* Reset FIFO -- documented */
 461         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_FCR, 0))
 462                 return;
 463         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_FCR,
 464             MCS7840_UART_FCR_ENABLE | MCS7840_UART_FCR_FLUSHRHR |
 465             MCS7840_UART_FCR_FLUSHTHR | MCS7840_UART_FCR_RTL_1_14))
 466                 return;
 467
 468         /* Set 8 bit, no parity, 1 stop bit -- documented */
 469         sc->sc_ports[pn].sc_lcr = MCS7840_UART_LCR_DATALEN8 | MCS7840_UART_LCR_STOPB1;
 470         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, sc->sc_ports[pn].sc_lcr))
 471                 return;
 472
 473         /*
 474          * Enable DTR/RTS on modem control, enable modem interrupts --
 475          * documented
 476          */
 477         sc->sc_ports[pn].sc_mcr = MCS7840_UART_MCR_DTR | MCS7840_UART_MCR_RTS | MCS7840_UART_MCR_IE;
 478         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr))
 479                 return;
 480
 481         /* Clearing Bulkin and Bulkout FIFO */
 482         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, &data))
 483                 return;
 484         data |= MCS7840_DEV_SPx_RESET_OUT_FIFO | MCS7840_DEV_SPx_RESET_IN_FIFO;
 485         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, data))
 486                 return;
 487         data &= ~(MCS7840_DEV_SPx_RESET_OUT_FIFO | MCS7840_DEV_SPx_RESET_IN_FIFO);
 488         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, data))
 489                 return;
 490
 491         /* Set speed 9600 */
 492         if (umcs7840_set_baudrate(sc, pn, 9600))
 493                 return;
 494
 495
 496         /* Finally enable all interrupts -- documented */
 497         /*
 498          * Copied from vendor driver, I don't know why we should read LCR
 499          * here
 500          */
 501         if (umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, &sc->sc_ports[pn].sc_lcr))
 502                 return;
 503         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_IER,
 504             MCS7840_UART_IER_RXSTAT | MCS7840_UART_IER_MODEM))
 505                 return;
 506
 507         /* Enable RX */
 508         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_control, &data))
 509                 return;
 510         data &= ~MCS7840_DEV_CONTROLx_RX_DISABLE;
 511         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_control, data))
 512                 return;
 513
 514         /* Read LSR & MSR */
 515         if (umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_LSR, &sc->sc_ports[pn].sc_lsr))
 516                 return;
 517         if (umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_MSR, &sc->sc_ports[pn].sc_msr))
 518                 return;
 519         DPRINTF("Port %d has been opened, LSR=%02x MSR=%02x\n", pn, sc->sc_ports[pn].sc_lsr, sc->sc_ports[pn].sc_msr);
 520 }
 521
 522 static void
 523 umcs7840_cfg_close(struct ucom_softc *ucom)
 524 {
 525         struct umcs7840_softc *sc = ucom->sc_parent;
 526         uint16_t pn = ucom->sc_portno;
 527         uint8_t data;
 528
 529         umcs7840_stop_read(ucom);
 530         umcs7840_stop_write(ucom);
 531
 532         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, 0);
 533         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_IER, 0);
 534
 535         /* Disable RX */
 536         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_control, &data))
 537                 return;
 538         data |= MCS7840_DEV_CONTROLx_RX_DISABLE;
 539         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_control, data))
 540                 return;
 541         DPRINTF("Port %d has been closed\n", pn);
 542 }
 543
 544 static void
 545 umcs7840_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
 546 {
 547         struct umcs7840_softc *sc = ucom->sc_parent;
 548         uint8_t pn = ucom->sc_portno;
 549
 550         if (onoff)
 551                 sc->sc_ports[pn].sc_mcr |= MCS7840_UART_MCR_DTR;
 552         else
 553                 sc->sc_ports[pn].sc_mcr &= ~MCS7840_UART_MCR_DTR;
 554
 555         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr);
 556         DPRINTF("Port %d DTR set to: %s\n", pn, onoff ? "on" : "off");
 557 }
 558
 559 static void
 560 umcs7840_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
 561 {
 562         struct umcs7840_softc *sc = ucom->sc_parent;
 563         uint8_t pn = ucom->sc_portno;
 564
 565         if (onoff)
 566                 sc->sc_ports[pn].sc_mcr |= MCS7840_UART_MCR_RTS;
 567         else
 568                 sc->sc_ports[pn].sc_mcr &= ~MCS7840_UART_MCR_RTS;
 569
 570         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr);
 571         DPRINTF("Port %d RTS set to: %s\n", pn, onoff ? "on" : "off");
 572 }
 573
 574 static void
 575 umcs7840_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
 576 {
 577         struct umcs7840_softc *sc = ucom->sc_parent;
 578         uint8_t pn = ucom->sc_portno;
 579
 580         if (onoff)
 581                 sc->sc_ports[pn].sc_lcr |= MCS7840_UART_LCR_BREAK;
 582         else
 583                 sc->sc_ports[pn].sc_lcr &= ~MCS7840_UART_LCR_BREAK;
 584
 585         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, sc->sc_ports[pn].sc_lcr);
 586         DPRINTF("Port %d BREAK set to: %s\n", pn, onoff ? "on" : "off");
 587 }
 588
 589
 590 static void
 591 umcs7840_cfg_param(struct ucom_softc *ucom, struct termios *t)
 592 {
 593         struct umcs7840_softc *sc = ucom->sc_parent;
 594         uint8_t pn = ucom->sc_portno;
 595         uint8_t lcr = sc->sc_ports[pn].sc_lcr;
 596         uint8_t mcr = sc->sc_ports[pn].sc_mcr;
 597
 598         DPRINTF("Port %d config:\n", pn);
 599         if (t->c_cflag & CSTOPB) {
 600                 DPRINTF("  2 stop bits\n");
 601                 lcr |= MCS7840_UART_LCR_STOPB2;
 602         } else {
 603                 lcr |= MCS7840_UART_LCR_STOPB1;
 604                 DPRINTF("  1 stop bit\n");
 605         }
 606
 607         lcr &= ~MCS7840_UART_LCR_PARITYMASK;
 608         if (t->c_cflag & PARENB) {
 609                 lcr |= MCS7840_UART_LCR_PARITYON;
 610                 if (t->c_cflag & PARODD) {
 611                         lcr = MCS7840_UART_LCR_PARITYODD;
 612                         DPRINTF("  parity on - odd\n");
 613                 } else {
 614                         lcr = MCS7840_UART_LCR_PARITYEVEN;
 615                         DPRINTF("  parity on - even\n");
 616                 }
 617         } else {
 618                 lcr &= ~MCS7840_UART_LCR_PARITYON;
 619                 DPRINTF("  parity off\n");
 620         }
 621
 622         lcr &= ~MCS7840_UART_LCR_DATALENMASK;
 623         switch (t->c_cflag & CSIZE) {
 624         case CS5:
 625                 lcr |= MCS7840_UART_LCR_DATALEN5;
 626                 DPRINTF("  5 bit\n");
 627                 break;
 628         case CS6:
 629                 lcr |= MCS7840_UART_LCR_DATALEN6;
 630                 DPRINTF("  6 bit\n");
 631                 break;
 632         case CS7:
 633                 lcr |= MCS7840_UART_LCR_DATALEN7;
 634                 DPRINTF("  7 bit\n");
 635                 break;
 636         case CS8:
 637                 lcr |= MCS7840_UART_LCR_DATALEN8;
 638                 DPRINTF("  8 bit\n");
 639                 break;
 640         }
 641
 642         if (t->c_cflag & CRTSCTS) {
 643                 mcr |= MCS7840_UART_MCR_CTSRTS;
 644                 DPRINTF("  CTS/RTS\n");
 645         } else
 646                 mcr &= ~MCS7840_UART_MCR_CTSRTS;
 647
 648         if (t->c_cflag & (CDTR_IFLOW | CDSR_OFLOW)) {
 649                 mcr |= MCS7840_UART_MCR_DTRDSR;
 650                 DPRINTF("  DTR/DSR\n");
 651         } else
 652                 mcr &= ~MCS7840_UART_MCR_DTRDSR;
 653
 654         sc->sc_ports[pn].sc_lcr = lcr;
 655         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, sc->sc_ports[pn].sc_lcr);
 656         DPRINTF("Port %d LCR=%02x\n", pn, sc->sc_ports[pn].sc_lcr);
 657
 658         sc->sc_ports[pn].sc_mcr = mcr;
 659         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr);
 660         DPRINTF("Port %d MCR=%02x\n", pn, sc->sc_ports[pn].sc_mcr);
 661
 662         umcs7840_set_baudrate(sc, pn, t->c_ospeed);
 663 }
 664
 665
 666 static int
 667 umcs7840_pre_param(struct ucom_softc *ucom, struct termios *t)
 668 {
 669         uint8_t clk;
 670         uint16_t divisor;
 671
 672         if (umcs7840_calc_baudrate(t->c_ospeed, &divisor, &clk) || !divisor)
 673                 return (EINVAL);
 674         return (0);
 675 }
 676
 677 static void
 678 umcs7840_start_read(struct ucom_softc *ucom)
 679 {
 680         struct umcs7840_softc *sc = ucom->sc_parent;
 681         uint8_t pn = ucom->sc_portno;
 682
 683         /* Start interrupt transfer */
 684         usbd_transfer_start(sc->sc_intr_xfer);
 685
 686         /* Start read transfer */
 687         usbd_transfer_start(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_RD_EP]);
 688 }
 689
 690 static void
 691 umcs7840_stop_read(struct ucom_softc *ucom)
 692 {
 693         struct umcs7840_softc *sc = ucom->sc_parent;
 694         uint8_t pn = ucom->sc_portno;
 695
 696         /* Stop read transfer */
 697         usbd_transfer_stop(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_RD_EP]);
 698 }
 699
 700 static void
 701 umcs7840_start_write(struct ucom_softc *ucom)
 702 {
 703         struct umcs7840_softc *sc = ucom->sc_parent;
 704         uint8_t pn = ucom->sc_portno;
 705
 706         /* Start interrupt transfer */
 707         usbd_transfer_start(sc->sc_intr_xfer);
 708
 709         /* Start write transfer */
 710         usbd_transfer_start(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_WR_EP]);
 711 }
 712
 713 static void
 714 umcs7840_stop_write(struct ucom_softc *ucom)
 715 {
 716         struct umcs7840_softc *sc = ucom->sc_parent;
 717         uint8_t pn = ucom->sc_portno;
 718
 719         /* Stop write transfer */
 720         usbd_transfer_stop(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_WR_EP]);
 721 }
 722
 723 static void
 724 umcs7840_cfg_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
 725 {
 726         struct umcs7840_softc *sc = ucom->sc_parent;
 727
 728         *lsr = sc->sc_ports[ucom->sc_portno].sc_lsr;
 729         *msr = sc->sc_ports[ucom->sc_portno].sc_msr;
 730         DPRINTF("Port %d status: LSR=%02x MSR=%02x\n", ucom->sc_portno, *lsr, *msr);
 731 }
 732
 733 static void
 734 umcs7840_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 735 {
 736         struct umcs7840_softc *sc = usbd_xfer_softc(xfer);
 737         struct usb_page_cache *pc;
 738         uint8_t buf[13];
 739         int actlen;
 740         int subunit;
 741
 742         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 743
 744         switch (USB_GET_STATE(xfer)) {
 745         case USB_ST_TRANSFERRED:
 746                 if (actlen == 5 || actlen == 13) {
 747                         pc = usbd_xfer_get_frame(xfer, 0);
 748                         usbd_copy_out(pc, 0, buf, actlen);
 749                         /* Check status of all ports */
 750                         for (subunit = 0; subunit < sc->sc_numports; ++subunit) {
 751                                 uint8_t pn = sc->sc_ucom[subunit].sc_portno;
 752
 753                                 if (buf[pn] & MCS7840_UART_ISR_NOPENDING)
 754                                         continue;
 755                                 DPRINTF("Port %d has pending interrupt: %02x (FIFO: %02x)\n", pn, buf[pn] & MCS7840_UART_ISR_INTMASK, buf[pn] & (~MCS7840_UART_ISR_INTMASK));
 756                                 switch (buf[pn] & MCS7840_UART_ISR_INTMASK) {
 757                                 case MCS7840_UART_ISR_RXERR:
 758                                 case MCS7840_UART_ISR_RXHASDATA:
 759                                 case MCS7840_UART_ISR_RXTIMEOUT:
 760                                         /* Read new LSR */
 761                                         if (umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_LSR, &sc->sc_ports[pn].sc_lsr))
 762                                                 break;  /* Inner switch */
 763                                         ucom_status_change(&sc->sc_ucom[subunit]);
 764                                         /* Inner switch */
 765                                         break;
 766                                 case MCS7840_UART_ISR_TXEMPTY:
 767                                         /* Do nothing */
 768                                         break;  /* Inner switch */
 769                                 case MCS7840_UART_ISR_MSCHANGE:
 770                                         /* Read new MSR */
 771                                         if (umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_MSR, &sc->sc_ports[pn].sc_msr))
 772                                                 break;  /* Inner switch */
 773                                         DPRINTF("Port %d: new MSR %02x\n", pn, sc->sc_ports[pn].sc_msr);
 774                                         ucom_status_change(&sc->sc_ucom[subunit]);
 775                                         break;
 776                                 }
 777                         }
 778                 } else
 779                         device_printf(sc->sc_dev, "Invalid interrupt data length %d", actlen);
 780                 /* FALLTHROUGH */
 781         case USB_ST_SETUP:
 782 tr_setup:
 783                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 784                 usbd_transfer_submit(xfer);
 785                 return;
 786
 787         default:                        /* Error */
 788                 if (error != USB_ERR_CANCELLED) {
 789                         /* try to clear stall first */
 790                         usbd_xfer_set_stall(xfer);
 791                         goto tr_setup;
 792                 }
 793                 return;
 794         }
 795 }
 796
 797 static void
 798 umcs7840_read_callback1(struct usb_xfer *xfer, usb_error_t error)
 799 {
 800         umcs7840_read_callbackN(xfer, error, 0);
 801 }
 802
 803 static void
 804 umcs7840_read_callback2(struct usb_xfer *xfer, usb_error_t error)
 805 {
 806         umcs7840_read_callbackN(xfer, error, 1);
 807 }
 808 static void
 809 umcs7840_read_callback3(struct usb_xfer *xfer, usb_error_t error)
 810 {
 811         umcs7840_read_callbackN(xfer, error, 2);
 812 }
 813
 814 static void
 815 umcs7840_read_callback4(struct usb_xfer *xfer, usb_error_t error)
 816 {
 817         umcs7840_read_callbackN(xfer, error, 3);
 818 }
 819
 820 static void
 821 umcs7840_read_callbackN(struct usb_xfer *xfer, usb_error_t error, uint8_t subunit)
 822 {
 823         struct umcs7840_softc *sc = usbd_xfer_softc(xfer);
 824         struct ucom_softc *ucom = &sc->sc_ucom[subunit];
 825         struct usb_page_cache *pc;
 826         int actlen;
 827
 828         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 829
 830         DPRINTF("Port %d read, state = %d, data length = %d\n", ucom->sc_portno, USB_GET_STATE(xfer), actlen);
 831
 832         switch (USB_GET_STATE(xfer)) {
 833         case USB_ST_TRANSFERRED:
 834                 pc = usbd_xfer_get_frame(xfer, 0);
 835                 ucom_put_data(ucom, pc, 0, actlen);
 836                 /* FALLTHROUGH */
 837         case USB_ST_SETUP:
 838 tr_setup:
 839                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 840                 usbd_transfer_submit(xfer);
 841                 return;
 842
 843         default:                        /* Error */
 844                 if (error != USB_ERR_CANCELLED) {
 845                         /* try to clear stall first */
 846                         usbd_xfer_set_stall(xfer);
 847                         goto tr_setup;
 848                 }
 849                 return;
 850         }
 851 }
 852
 853 static void
 854 umcs7840_write_callback1(struct usb_xfer *xfer, usb_error_t error)
 855 {
 856         umcs7840_write_callbackN(xfer, error, 0);
 857 }
 858
 859 static void
 860 umcs7840_write_callback2(struct usb_xfer *xfer, usb_error_t error)
 861 {
 862         umcs7840_write_callbackN(xfer, error, 1);
 863 }
 864
 865 static void
 866 umcs7840_write_callback3(struct usb_xfer *xfer, usb_error_t error)
 867 {
 868         umcs7840_write_callbackN(xfer, error, 2);
 869 }
 870
 871 static void
 872 umcs7840_write_callback4(struct usb_xfer *xfer, usb_error_t error)
 873 {
 874         umcs7840_write_callbackN(xfer, error, 3);
 875 }
 876
 877 static void
 878 umcs7840_write_callbackN(struct usb_xfer *xfer, usb_error_t error, uint8_t subunit)
 879 {
 880         struct umcs7840_softc *sc = usbd_xfer_softc(xfer);
 881         struct ucom_softc *ucom = &sc->sc_ucom[subunit];
 882         struct usb_page_cache *pc;
 883         uint32_t actlen;
 884
 885         DPRINTF("Port %d write, state = %d\n", ucom->sc_portno, USB_GET_STATE(xfer));
 886
 887         switch (USB_GET_STATE(xfer)) {
 888         case USB_ST_SETUP:
 889         case USB_ST_TRANSFERRED:
 890 tr_setup:
 891                 pc = usbd_xfer_get_frame(xfer, 0);
 892                 if (ucom_get_data(ucom, pc, 0, usbd_xfer_max_len(xfer), &actlen)) {
 893                         DPRINTF("Port %d write, has %d bytes\n", ucom->sc_portno, actlen);
 894                         usbd_xfer_set_frame_len(xfer, 0, actlen);
 895                         usbd_transfer_submit(xfer);
 896                 }
 897                 return;
 898
 899         default:                        /* Error */
 900                 if (error != USB_ERR_CANCELLED) {
 901                         /* try to clear stall first */
 902                         usbd_xfer_set_stall(xfer);
 903                         goto tr_setup;
 904                 }
 905                 return;
 906         }
 907 }
 908
 909 static void
 910 umcs7840_poll(struct ucom_softc *ucom)
 911 {
 912         struct umcs7840_softc *sc = ucom->sc_parent;
 913
 914         DPRINTF("Port %d poll\n", ucom->sc_portno);
 915         usbd_transfer_poll(sc->sc_ports[ucom->sc_portno].sc_xfer, UMCS7840_N_TRANSFERS);
 916         usbd_transfer_poll(&sc->sc_intr_xfer, 1);
 917 }
 918
 919 static usb_error_t
 920 umcs7840_get_reg_sync(struct umcs7840_softc *sc, uint8_t reg, uint8_t *data)
 921 {
 922         struct usb_device_request req;
 923         usb_error_t err;
 924         uint16_t len;
 925
 926         req.bmRequestType = UT_READ_VENDOR_DEVICE;
 927         req.bRequest = MCS7840_RDREQ;
 928         USETW(req.wValue, 0);
 929         USETW(req.wIndex, reg);
 930         USETW(req.wLength, UMCS7840_READ_LENGTH);
 931
 932         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, (void *)data, 0, &len, UMCS7840_CTRL_TIMEOUT);
 933         if (err == USB_ERR_NORMAL_COMPLETION && len != 1) {
 934                 device_printf(sc->sc_dev, "Reading register %d failed: invalid length %d\n", reg, len);
 935                 return (USB_ERR_INVAL);
 936         } else if (err)
 937                 device_printf(sc->sc_dev, "Reading register %d failed: %s\n", reg, usbd_errstr(err));
 938         return (err);
 939 }
 940
 941 static usb_error_t
 942 umcs7840_set_reg_sync(struct umcs7840_softc *sc, uint8_t reg, uint8_t data)
 943 {
 944         struct usb_device_request req;
 945         usb_error_t err;
 946
 947         req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
 948         req.bRequest = MCS7840_WRREQ;
 949         USETW(req.wValue, data);
 950         USETW(req.wIndex, reg);
 951         USETW(req.wLength, 0);
 952
 953         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, NULL, 0, NULL, UMCS7840_CTRL_TIMEOUT);
 954         if (err)
 955                 device_printf(sc->sc_dev, "Writing register %d failed: %s\n", reg, usbd_errstr(err));
 956
 957         return (err);
 958 }
 959
 960 static usb_error_t
 961 umcs7840_get_UART_reg_sync(struct umcs7840_softc *sc, uint8_t portno, uint8_t reg, uint8_t *data)
 962 {
 963         struct usb_device_request req;
 964         uint16_t wVal;
 965         usb_error_t err;
 966         uint16_t len;
 967
 968         /* portno is port number */
 969         wVal = ((uint16_t)(portno + 1)) << 8;
 970
 971         req.bmRequestType = UT_READ_VENDOR_DEVICE;
 972         req.bRequest = MCS7840_RDREQ;
 973         USETW(req.wValue, wVal);
 974         USETW(req.wIndex, reg);
 975         USETW(req.wLength, UMCS7840_READ_LENGTH);
 976
 977         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, (void *)data, 0, &len, UMCS7840_CTRL_TIMEOUT);
 978         if (err == USB_ERR_NORMAL_COMPLETION && len != 1) {
 979                 device_printf(sc->sc_dev, "Reading UART%d register %d failed: invalid length %d\n", portno, reg, len);
 980                 return (USB_ERR_INVAL);
 981         } else if (err)
 982                 device_printf(sc->sc_dev, "Reading UART%d register %d failed: %s\n", portno, reg, usbd_errstr(err));
 983         return (err);
 984 }
 985
 986 static usb_error_t
 987 umcs7840_set_UART_reg_sync(struct umcs7840_softc *sc, uint8_t portno, uint8_t reg, uint8_t data)
 988 {
 989         struct usb_device_request req;
 990         usb_error_t err;
 991         uint16_t wVal;
 992
 993         /* portno is port number */
 994         wVal = ((uint16_t)(portno + 1)) << 8 | data;
 995
 996         req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
 997         req.bRequest = MCS7840_WRREQ;
 998         USETW(req.wValue, wVal);
 999         USETW(req.wIndex, reg);
1000         USETW(req.wLength, 0);
1001
1002         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, NULL, 0, NULL, UMCS7840_CTRL_TIMEOUT);
1003         if (err)
1004                 device_printf(sc->sc_dev, "Writing UART%d register %d failed: %s\n", portno, reg, usbd_errstr(err));
1005         return (err);
1006 }
1007
1008 static usb_error_t
1009 umcs7840_set_baudrate(struct umcs7840_softc *sc, uint8_t portno, uint32_t rate)
1010 {
1011         usb_error_t err;
1012         uint16_t divisor;
1013         uint8_t clk;
1014         uint8_t data;
1015
1016         if (umcs7840_calc_baudrate(rate, &divisor, &clk)) {
1017                 DPRINTF("Port %d bad speed: %d\n", portno, rate);
1018                 return (-1);
1019         }
1020         if (divisor == 0 || (clk & MCS7840_DEV_SPx_CLOCK_MASK) != clk) {
1021                 DPRINTF("Port %d bad speed calculation: %d\n", portno, rate);
1022                 return (-1);
1023         }
1024         DPRINTF("Port %d set speed: %d (%02x / %d)\n", portno, rate, clk, divisor);
1025
1026         /* Set clock source for standard BAUD frequences */
1027         err = umcs7840_get_reg_sync(sc, umcs7840_port_registers[portno].reg_sp, &data);
1028         if (err)
1029                 return (err);
1030         data &= MCS7840_DEV_SPx_CLOCK_MASK;
1031         data |= clk;
1032         err = umcs7840_set_reg_sync(sc, umcs7840_port_registers[portno].reg_sp, data);
1033         if (err)
1034                 return (err);
1035
1036         /* Set divider */
1037         sc->sc_ports[portno].sc_lcr |= MCS7840_UART_LCR_DIVISORS;
1038         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_LCR, sc->sc_ports[portno].sc_lcr);
1039         if (err)
1040                 return (err);
1041
1042         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_DLL, (uint8_t)(divisor & 0xff));
1043         if (err)
1044                 return (err);
1045         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_DLM, (uint8_t)((divisor >> 8) & 0xff));
1046         if (err)
1047                 return (err);
1048
1049         /* Turn off access to DLL/DLM registers of UART */
1050         sc->sc_ports[portno].sc_lcr &= ~MCS7840_UART_LCR_DIVISORS;
1051         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_LCR, sc->sc_ports[portno].sc_lcr);
1052         if (err)
1053                 return (err);
1054         return (0);
1055 }
1056
1057 /* Maximum speeds for standard frequences, when PLL is not used */
1058 static const uint32_t umcs7840_baudrate_divisors[] = {0, 115200, 230400, 403200, 460800, 806400, 921600, 1572864, 3145728,};
1059 static const uint8_t umcs7840_baudrate_divisors_len = sizeof(umcs7840_baudrate_divisors) / sizeof(umcs7840_baudrate_divisors[0]);
1060
1061 static usb_error_t
1062 umcs7840_calc_baudrate(uint32_t rate, uint16_t *divisor, uint8_t *clk)
1063 {
1064         uint8_t i = 0;
1065
1066         if (rate > umcs7840_baudrate_divisors[umcs7840_baudrate_divisors_len - 1])
1067                 return (-1);
1068
1069         for (i = 0; i < umcs7840_baudrate_divisors_len - 1 &&
1070             !(rate > umcs7840_baudrate_divisors[i] && rate <= umcs7840_baudrate_divisors[i + 1]); ++i);
1071         *divisor = umcs7840_baudrate_divisors[i + 1] / rate;
1072         /* 0x00 .. 0x70 */
1073         *clk = i << MCS7840_DEV_SPx_CLOCK_SHIFT;
1074         return (0);
1075 }