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_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 };
 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
 282 static int
 283 umcs7840_probe(device_t dev)
 284 {
 285         struct usb_attach_arg *uaa = device_get_ivars(dev);
 286
 287         if (uaa->usb_mode != USB_MODE_HOST)
 288                 return (ENXIO);
 289         if (uaa->info.bConfigIndex != MCS7840_CONFIG_INDEX)
 290                 return (ENXIO);
 291         if (uaa->info.bIfaceIndex != MCS7840_IFACE_INDEX)
 292                 return (ENXIO);
 293         return (usbd_lookup_id_by_uaa(umcs7840_devs, sizeof(umcs7840_devs), uaa));
 294 }
 295
 296 static int
 297 umcs7840_attach(device_t dev)
 298 {
 299         struct usb_config umcs7840_config_tmp[UMCS7840_N_TRANSFERS];
 300         struct usb_attach_arg *uaa = device_get_ivars(dev);
 301         struct umcs7840_softc *sc = device_get_softc(dev);
 302
 303         uint8_t iface_index = MCS7840_IFACE_INDEX;
 304         int error;
 305         int subunit;
 306         int n;
 307         uint8_t data;
 308
 309         for (n = 0; n < UMCS7840_N_TRANSFERS; ++n)
 310                 umcs7840_config_tmp[n] = umcs7840_bulk_config_data[n];
 311
 312         device_set_usb_desc(dev);
 313         mtx_init(&sc->sc_mtx, "umcs7840", NULL, MTX_DEF);
 314         ucom_ref(&sc->sc_super_ucom);
 315
 316         sc->sc_dev = dev;
 317         sc->sc_udev = uaa->device;
 318
 319         /*
 320          * Get number of ports
 321          * Documentation (full datasheet) says, that number of ports is
 322          * set as MCS7840_DEV_MODE_SELECT24S bit in MODE R/Only
 323          * register. But vendor driver uses these undocumented
 324          * register & bit.
 325          *
 326          * Experiments show, that MODE register can have `0'
 327          * (4 ports) bit on 2-port device, so use vendor driver's way.
 328          *
 329          * Also, see notes in header file for these constants.
 330          */
 331         umcs7840_get_reg_sync(sc, MCS7840_DEV_REG_GPIO, &data);
 332         if (data & MCS7840_DEV_GPIO_4PORTS) {
 333                 sc->sc_numports = 4;
 334                 /* Store physical port numbers in sc_portno */
 335                 sc->sc_ucom[0].sc_portno = 0;
 336                 sc->sc_ucom[1].sc_portno = 1;
 337                 sc->sc_ucom[2].sc_portno = 2;
 338                 sc->sc_ucom[3].sc_portno = 3;
 339         } else {
 340                 sc->sc_numports = 2;
 341                 /* Store physical port numbers in sc_portno */
 342                 sc->sc_ucom[0].sc_portno = 0;
 343                 sc->sc_ucom[1].sc_portno = 2;   /* '1' is skipped */
 344         }
 345         device_printf(dev, "Chip mcs%04x, found %d active ports\n", uaa->info.idProduct, sc->sc_numports);
 346         if (!umcs7840_get_reg_sync(sc, MCS7840_DEV_REG_MODE, &data)) {
 347                 device_printf(dev, "On-die confguration: RST: active %s, HRD: %s, PLL: %s, POR: %s, Ports: %s, EEPROM write %s, IrDA is %savailable\n",
 348                     (data & MCS7840_DEV_MODE_RESET) ? "low" : "high",
 349                     (data & MCS7840_DEV_MODE_SER_PRSNT) ? "yes" : "no",
 350                     (data & MCS7840_DEV_MODE_PLLBYPASS) ? "bypassed" : "avail",
 351                     (data & MCS7840_DEV_MODE_PORBYPASS) ? "bypassed" : "avail",
 352                     (data & MCS7840_DEV_MODE_SELECT24S) ? "2" : "4",
 353                     (data & MCS7840_DEV_MODE_EEPROMWR) ? "enabled" : "disabled",
 354                     (data & MCS7840_DEV_MODE_IRDA) ? "" : "not ");
 355         }
 356         /* Setup all transfers */
 357         for (subunit = 0; subunit < sc->sc_numports; ++subunit) {
 358                 for (n = 0; n < UMCS7840_N_TRANSFERS; ++n) {
 359                         /* Set endpoint address */
 360                         umcs7840_config_tmp[n].endpoint = umcs7840_bulk_config_data[n].endpoint + 2 * sc->sc_ucom[subunit].sc_portno;
 361                         umcs7840_config_tmp[n].callback = umcs7840_rw_callbacks[subunit][n];
 362                 }
 363                 error = usbd_transfer_setup(uaa->device,
 364                     &iface_index, sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer, umcs7840_config_tmp,
 365                     UMCS7840_N_TRANSFERS, sc, &sc->sc_mtx);
 366                 if (error) {
 367                         device_printf(dev, "allocating USB transfers failed for subunit %d of %d\n",
 368                             subunit + 1, sc->sc_numports);
 369                         goto detach;
 370                 }
 371         }
 372         error = usbd_transfer_setup(uaa->device,
 373             &iface_index, &sc->sc_intr_xfer, umcs7840_intr_config_data,
 374             1, sc, &sc->sc_mtx);
 375         if (error) {
 376                 device_printf(dev, "allocating USB transfers failed for interrupt\n");
 377                 goto detach;
 378         }
 379         /* clear stall at first run */
 380         mtx_lock(&sc->sc_mtx);
 381         for (subunit = 0; subunit < sc->sc_numports; ++subunit) {
 382                 usbd_xfer_set_stall(sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer[UMCS7840_BULK_RD_EP]);
 383                 usbd_xfer_set_stall(sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer[UMCS7840_BULK_WR_EP]);
 384         }
 385         mtx_unlock(&sc->sc_mtx);
 386
 387         error = ucom_attach(&sc->sc_super_ucom, sc->sc_ucom, sc->sc_numports, sc,
 388             &umcs7840_callback, &sc->sc_mtx);
 389         if (error)
 390                 goto detach;
 391
 392         ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
 393
 394         return (0);
 395
 396 detach:
 397         umcs7840_detach(dev);
 398         return (ENXIO);
 399 }
 400
 401 static int
 402 umcs7840_detach(device_t dev)
 403 {
 404         struct umcs7840_softc *sc = device_get_softc(dev);
 405         int subunit;
 406
 407         ucom_detach(&sc->sc_super_ucom, sc->sc_ucom);
 408
 409         for (subunit = 0; subunit < sc->sc_numports; ++subunit)
 410                 usbd_transfer_unsetup(sc->sc_ports[sc->sc_ucom[subunit].sc_portno].sc_xfer, UMCS7840_N_TRANSFERS);
 411         usbd_transfer_unsetup(&sc->sc_intr_xfer, 1);
 412
 413         device_claim_softc(dev);
 414
 415         umcs7840_free_softc(sc);
 416
 417         return (0);
 418 }
 419
 420 UCOM_UNLOAD_DRAIN(umcs7840);
 421
 422 static void
 423 umcs7840_free_softc(struct umcs7840_softc *sc)
 424 {
 425         if (ucom_unref(&sc->sc_super_ucom)) {
 426                 mtx_destroy(&sc->sc_mtx);
 427                 device_free_softc(sc);
 428         }
 429 }
 430
 431 static void
 432 umcs7840_free(struct ucom_softc *ucom)
 433 {
 434         umcs7840_free_softc(ucom->sc_parent);
 435 }
 436
 437 static void
 438 umcs7840_cfg_open(struct ucom_softc *ucom)
 439 {
 440         struct umcs7840_softc *sc = ucom->sc_parent;
 441         uint16_t pn = ucom->sc_portno;
 442         uint8_t data;
 443
 444         /* If it very first open, finish global configuration */
 445         if (!sc->sc_driver_done) {
 446                 /*
 447                  * USB enumeration is finished, pass internal memory to FIFOs
 448                  * If it is done in the end of "attach", kernel panics.
 449                  */
 450                 if (umcs7840_get_reg_sync(sc, MCS7840_DEV_REG_CONTROL1, &data))
 451                         return;
 452                 data |= MCS7840_DEV_CONTROL1_DRIVER_DONE;
 453                 if (umcs7840_set_reg_sync(sc, MCS7840_DEV_REG_CONTROL1, data))
 454                         return;
 455                 sc->sc_driver_done = 1;
 456         }
 457         /* Toggle reset bit on-off */
 458         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, &data))
 459                 return;
 460         data |= MCS7840_DEV_SPx_UART_RESET;
 461         if (umcs7840_set_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
 467         /* Set RS-232 mode */
 468         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_SCRATCHPAD, MCS7840_UART_SCRATCHPAD_RS232))
 469                 return;
 470
 471         /* Disable RX on time of initialization */
 472         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_control, &data))
 473                 return;
 474         data |= MCS7840_DEV_CONTROLx_RX_DISABLE;
 475         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_control, data))
 476                 return;
 477
 478         /* Disable all interrupts */
 479         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_IER, 0))
 480                 return;
 481
 482         /* Reset FIFO -- documented */
 483         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_FCR, 0))
 484                 return;
 485         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_FCR,
 486             MCS7840_UART_FCR_ENABLE | MCS7840_UART_FCR_FLUSHRHR |
 487             MCS7840_UART_FCR_FLUSHTHR | MCS7840_UART_FCR_RTL_1_14))
 488                 return;
 489
 490         /* Set 8 bit, no parity, 1 stop bit -- documented */
 491         sc->sc_ports[pn].sc_lcr = MCS7840_UART_LCR_DATALEN8 | MCS7840_UART_LCR_STOPB1;
 492         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, sc->sc_ports[pn].sc_lcr))
 493                 return;
 494
 495         /*
 496          * Enable DTR/RTS on modem control, enable modem interrupts --
 497          * documented
 498          */
 499         sc->sc_ports[pn].sc_mcr = MCS7840_UART_MCR_DTR | MCS7840_UART_MCR_RTS | MCS7840_UART_MCR_IE;
 500         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr))
 501                 return;
 502
 503         /* Clearing Bulkin and Bulkout FIFO */
 504         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_sp, &data))
 505                 return;
 506         data |= MCS7840_DEV_SPx_RESET_OUT_FIFO | MCS7840_DEV_SPx_RESET_IN_FIFO;
 507         if (umcs7840_set_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
 513         /* Set speed 9600 */
 514         if (umcs7840_set_baudrate(sc, pn, 9600))
 515                 return;
 516
 517
 518         /* Finally enable all interrupts -- documented */
 519         /*
 520          * Copied from vendor driver, I don't know why we should read LCR
 521          * here
 522          */
 523         if (umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, &sc->sc_ports[pn].sc_lcr))
 524                 return;
 525         if (umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_IER,
 526             MCS7840_UART_IER_RXSTAT | MCS7840_UART_IER_MODEM))
 527                 return;
 528
 529         /* Enable RX */
 530         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_control, &data))
 531                 return;
 532         data &= ~MCS7840_DEV_CONTROLx_RX_DISABLE;
 533         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_control, data))
 534                 return;
 535
 536         DPRINTF("Port %d has been opened\n", pn);
 537 }
 538
 539 static void
 540 umcs7840_cfg_close(struct ucom_softc *ucom)
 541 {
 542         struct umcs7840_softc *sc = ucom->sc_parent;
 543         uint16_t pn = ucom->sc_portno;
 544         uint8_t data;
 545
 546         umcs7840_stop_read(ucom);
 547         umcs7840_stop_write(ucom);
 548
 549         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, 0);
 550         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_IER, 0);
 551
 552         /* Disable RX */
 553         if (umcs7840_get_reg_sync(sc, umcs7840_port_registers[pn].reg_control, &data))
 554                 return;
 555         data |= MCS7840_DEV_CONTROLx_RX_DISABLE;
 556         if (umcs7840_set_reg_sync(sc, umcs7840_port_registers[pn].reg_control, data))
 557                 return;
 558         DPRINTF("Port %d has been closed\n", pn);
 559 }
 560
 561 static void
 562 umcs7840_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
 563 {
 564         struct umcs7840_softc *sc = ucom->sc_parent;
 565         uint8_t pn = ucom->sc_portno;
 566
 567         if (onoff)
 568                 sc->sc_ports[pn].sc_mcr |= MCS7840_UART_MCR_DTR;
 569         else
 570                 sc->sc_ports[pn].sc_mcr &= ~MCS7840_UART_MCR_DTR;
 571
 572         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr);
 573         DPRINTF("Port %d DTR set to: %s\n", pn, onoff ? "on" : "off");
 574 }
 575
 576 static void
 577 umcs7840_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
 578 {
 579         struct umcs7840_softc *sc = ucom->sc_parent;
 580         uint8_t pn = ucom->sc_portno;
 581
 582         if (onoff)
 583                 sc->sc_ports[pn].sc_mcr |= MCS7840_UART_MCR_RTS;
 584         else
 585                 sc->sc_ports[pn].sc_mcr &= ~MCS7840_UART_MCR_RTS;
 586
 587         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr);
 588         DPRINTF("Port %d RTS set to: %s\n", pn, onoff ? "on" : "off");
 589 }
 590
 591 static void
 592 umcs7840_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
 593 {
 594         struct umcs7840_softc *sc = ucom->sc_parent;
 595         uint8_t pn = ucom->sc_portno;
 596
 597         if (onoff)
 598                 sc->sc_ports[pn].sc_lcr |= MCS7840_UART_LCR_BREAK;
 599         else
 600                 sc->sc_ports[pn].sc_lcr &= ~MCS7840_UART_LCR_BREAK;
 601
 602         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, sc->sc_ports[pn].sc_lcr);
 603         DPRINTF("Port %d BREAK set to: %s\n", pn, onoff ? "on" : "off");
 604 }
 605
 606
 607 static void
 608 umcs7840_cfg_param(struct ucom_softc *ucom, struct termios *t)
 609 {
 610         struct umcs7840_softc *sc = ucom->sc_parent;
 611         uint8_t pn = ucom->sc_portno;
 612         uint8_t lcr = sc->sc_ports[pn].sc_lcr;
 613         uint8_t mcr = sc->sc_ports[pn].sc_mcr;
 614
 615         DPRINTF("Port %d config:\n", pn);
 616         if (t->c_cflag & CSTOPB) {
 617                 DPRINTF("  2 stop bits\n");
 618                 lcr |= MCS7840_UART_LCR_STOPB2;
 619         } else {
 620                 lcr |= MCS7840_UART_LCR_STOPB1;
 621                 DPRINTF("  1 stop bit\n");
 622         }
 623
 624         lcr &= ~MCS7840_UART_LCR_PARITYMASK;
 625         if (t->c_cflag & PARENB) {
 626                 lcr |= MCS7840_UART_LCR_PARITYON;
 627                 if (t->c_cflag & PARODD) {
 628                         lcr = MCS7840_UART_LCR_PARITYODD;
 629                         DPRINTF("  parity on - odd\n");
 630                 } else {
 631                         lcr = MCS7840_UART_LCR_PARITYEVEN;
 632                         DPRINTF("  parity on - even\n");
 633                 }
 634         } else {
 635                 lcr &= ~MCS7840_UART_LCR_PARITYON;
 636                 DPRINTF("  parity off\n");
 637         }
 638
 639         lcr &= ~MCS7840_UART_LCR_DATALENMASK;
 640         switch (t->c_cflag & CSIZE) {
 641         case CS5:
 642                 lcr |= MCS7840_UART_LCR_DATALEN5;
 643                 DPRINTF("  5 bit\n");
 644                 break;
 645         case CS6:
 646                 lcr |= MCS7840_UART_LCR_DATALEN6;
 647                 DPRINTF("  6 bit\n");
 648                 break;
 649         case CS7:
 650                 lcr |= MCS7840_UART_LCR_DATALEN7;
 651                 DPRINTF("  7 bit\n");
 652                 break;
 653         case CS8:
 654                 lcr |= MCS7840_UART_LCR_DATALEN8;
 655                 DPRINTF("  8 bit\n");
 656                 break;
 657         }
 658
 659         if (t->c_cflag & CRTSCTS) {
 660                 mcr |= MCS7840_UART_MCR_CTSRTS;
 661                 DPRINTF("  CTS/RTS\n");
 662         } else
 663                 mcr &= ~MCS7840_UART_MCR_CTSRTS;
 664
 665         if (t->c_cflag & (CDTR_IFLOW | CDSR_OFLOW)) {
 666                 mcr |= MCS7840_UART_MCR_DTRDSR;
 667                 DPRINTF("  DTR/DSR\n");
 668         } else
 669                 mcr &= ~MCS7840_UART_MCR_DTRDSR;
 670
 671         sc->sc_ports[pn].sc_lcr = lcr;
 672         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_LCR, sc->sc_ports[pn].sc_lcr);
 673         DPRINTF("Port %d LCR=%02x\n", pn, sc->sc_ports[pn].sc_lcr);
 674
 675         sc->sc_ports[pn].sc_mcr = mcr;
 676         umcs7840_set_UART_reg_sync(sc, pn, MCS7840_UART_REG_MCR, sc->sc_ports[pn].sc_mcr);
 677         DPRINTF("Port %d MCR=%02x\n", pn, sc->sc_ports[pn].sc_mcr);
 678
 679         umcs7840_set_baudrate(sc, pn, t->c_ospeed);
 680 }
 681
 682
 683 static int
 684 umcs7840_pre_param(struct ucom_softc *ucom, struct termios *t)
 685 {
 686         uint8_t clk;
 687         uint16_t divisor;
 688
 689         if (umcs7840_calc_baudrate(t->c_ospeed, &divisor, &clk) || !divisor)
 690                 return (EINVAL);
 691         return (0);
 692 }
 693
 694 static void
 695 umcs7840_start_read(struct ucom_softc *ucom)
 696 {
 697         struct umcs7840_softc *sc = ucom->sc_parent;
 698         uint8_t pn = ucom->sc_portno;
 699
 700         /* Start interrupt transfer */
 701         usbd_transfer_start(sc->sc_intr_xfer);
 702
 703         /* Start read transfer */
 704         usbd_transfer_start(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_RD_EP]);
 705 }
 706
 707 static void
 708 umcs7840_stop_read(struct ucom_softc *ucom)
 709 {
 710         struct umcs7840_softc *sc = ucom->sc_parent;
 711         uint8_t pn = ucom->sc_portno;
 712
 713         /* Stop read transfer */
 714         usbd_transfer_stop(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_RD_EP]);
 715 }
 716
 717 static void
 718 umcs7840_start_write(struct ucom_softc *ucom)
 719 {
 720         struct umcs7840_softc *sc = ucom->sc_parent;
 721         uint8_t pn = ucom->sc_portno;
 722
 723         /* Start interrupt transfer */
 724         usbd_transfer_start(sc->sc_intr_xfer);
 725
 726         /* Start write transfer */
 727         usbd_transfer_start(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_WR_EP]);
 728 }
 729
 730 static void
 731 umcs7840_stop_write(struct ucom_softc *ucom)
 732 {
 733         struct umcs7840_softc *sc = ucom->sc_parent;
 734         uint8_t pn = ucom->sc_portno;
 735
 736         /* Stop write transfer */
 737         usbd_transfer_stop(sc->sc_ports[pn].sc_xfer[UMCS7840_BULK_WR_EP]);
 738 }
 739
 740 static void
 741 umcs7840_cfg_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
 742 {
 743         struct umcs7840_softc *sc = ucom->sc_parent;
 744         uint8_t pn = ucom->sc_portno;
 745         uint8_t hw_lsr = 0;     /* local line status register */
 746         uint8_t hw_msr = 0;     /* local modem status register */
 747
 748         /* Read LSR & MSR */
 749         umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_LSR, &hw_lsr);
 750         umcs7840_get_UART_reg_sync(sc, pn, MCS7840_UART_REG_MSR, &hw_msr);
 751
 752         *lsr = hw_lsr;
 753         *msr = hw_msr;
 754
 755         DPRINTF("Port %d status: LSR=%02x MSR=%02x\n", ucom->sc_portno, *lsr, *msr);
 756 }
 757
 758 static void
 759 umcs7840_intr_callback(struct usb_xfer *xfer, usb_error_t error)
 760 {
 761         struct umcs7840_softc *sc = usbd_xfer_softc(xfer);
 762         struct usb_page_cache *pc;
 763         uint8_t buf[13];
 764         int actlen;
 765         int subunit;
 766
 767         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 768
 769         switch (USB_GET_STATE(xfer)) {
 770         case USB_ST_TRANSFERRED:
 771                 if (actlen == 5 || actlen == 13) {
 772                         pc = usbd_xfer_get_frame(xfer, 0);
 773                         usbd_copy_out(pc, 0, buf, actlen);
 774                         /* Check status of all ports */
 775                         for (subunit = 0; subunit < sc->sc_numports; ++subunit) {
 776                                 uint8_t pn = sc->sc_ucom[subunit].sc_portno;
 777
 778                                 if (buf[pn] & MCS7840_UART_ISR_NOPENDING)
 779                                         continue;
 780                                 DPRINTF("Port %d has pending interrupt: %02x (FIFO: %02x)\n", pn, buf[pn] & MCS7840_UART_ISR_INTMASK, buf[pn] & (~MCS7840_UART_ISR_INTMASK));
 781                                 switch (buf[pn] & MCS7840_UART_ISR_INTMASK) {
 782                                 case MCS7840_UART_ISR_RXERR:
 783                                 case MCS7840_UART_ISR_RXHASDATA:
 784                                 case MCS7840_UART_ISR_RXTIMEOUT:
 785                                 case MCS7840_UART_ISR_MSCHANGE:
 786                                         ucom_status_change(&sc->sc_ucom[subunit]);
 787                                         break;
 788                                 default:
 789                                         /* Do nothing */
 790                                         break;
 791                                 }
 792                         }
 793                 } else
 794                         device_printf(sc->sc_dev, "Invalid interrupt data length %d", actlen);
 795                 /* FALLTHROUGH */
 796         case USB_ST_SETUP:
 797 tr_setup:
 798                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 799                 usbd_transfer_submit(xfer);
 800                 return;
 801
 802         default:                        /* Error */
 803                 if (error != USB_ERR_CANCELLED) {
 804                         /* try to clear stall first */
 805                         usbd_xfer_set_stall(xfer);
 806                         goto tr_setup;
 807                 }
 808                 return;
 809         }
 810 }
 811
 812 static void
 813 umcs7840_read_callback1(struct usb_xfer *xfer, usb_error_t error)
 814 {
 815         umcs7840_read_callbackN(xfer, error, 0);
 816 }
 817
 818 static void
 819 umcs7840_read_callback2(struct usb_xfer *xfer, usb_error_t error)
 820 {
 821         umcs7840_read_callbackN(xfer, error, 1);
 822 }
 823 static void
 824 umcs7840_read_callback3(struct usb_xfer *xfer, usb_error_t error)
 825 {
 826         umcs7840_read_callbackN(xfer, error, 2);
 827 }
 828
 829 static void
 830 umcs7840_read_callback4(struct usb_xfer *xfer, usb_error_t error)
 831 {
 832         umcs7840_read_callbackN(xfer, error, 3);
 833 }
 834
 835 static void
 836 umcs7840_read_callbackN(struct usb_xfer *xfer, usb_error_t error, uint8_t subunit)
 837 {
 838         struct umcs7840_softc *sc = usbd_xfer_softc(xfer);
 839         struct ucom_softc *ucom = &sc->sc_ucom[subunit];
 840         struct usb_page_cache *pc;
 841         int actlen;
 842
 843         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 844
 845         DPRINTF("Port %d read, state = %d, data length = %d\n", ucom->sc_portno, USB_GET_STATE(xfer), actlen);
 846
 847         switch (USB_GET_STATE(xfer)) {
 848         case USB_ST_TRANSFERRED:
 849                 pc = usbd_xfer_get_frame(xfer, 0);
 850                 ucom_put_data(ucom, pc, 0, actlen);
 851                 /* FALLTHROUGH */
 852         case USB_ST_SETUP:
 853 tr_setup:
 854                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 855                 usbd_transfer_submit(xfer);
 856                 return;
 857
 858         default:                        /* Error */
 859                 if (error != USB_ERR_CANCELLED) {
 860                         /* try to clear stall first */
 861                         usbd_xfer_set_stall(xfer);
 862                         goto tr_setup;
 863                 }
 864                 return;
 865         }
 866 }
 867
 868 static void
 869 umcs7840_write_callback1(struct usb_xfer *xfer, usb_error_t error)
 870 {
 871         umcs7840_write_callbackN(xfer, error, 0);
 872 }
 873
 874 static void
 875 umcs7840_write_callback2(struct usb_xfer *xfer, usb_error_t error)
 876 {
 877         umcs7840_write_callbackN(xfer, error, 1);
 878 }
 879
 880 static void
 881 umcs7840_write_callback3(struct usb_xfer *xfer, usb_error_t error)
 882 {
 883         umcs7840_write_callbackN(xfer, error, 2);
 884 }
 885
 886 static void
 887 umcs7840_write_callback4(struct usb_xfer *xfer, usb_error_t error)
 888 {
 889         umcs7840_write_callbackN(xfer, error, 3);
 890 }
 891
 892 static void
 893 umcs7840_write_callbackN(struct usb_xfer *xfer, usb_error_t error, uint8_t subunit)
 894 {
 895         struct umcs7840_softc *sc = usbd_xfer_softc(xfer);
 896         struct ucom_softc *ucom = &sc->sc_ucom[subunit];
 897         struct usb_page_cache *pc;
 898         uint32_t actlen;
 899
 900         DPRINTF("Port %d write, state = %d\n", ucom->sc_portno, USB_GET_STATE(xfer));
 901
 902         switch (USB_GET_STATE(xfer)) {
 903         case USB_ST_SETUP:
 904         case USB_ST_TRANSFERRED:
 905 tr_setup:
 906                 pc = usbd_xfer_get_frame(xfer, 0);
 907                 if (ucom_get_data(ucom, pc, 0, usbd_xfer_max_len(xfer), &actlen)) {
 908                         DPRINTF("Port %d write, has %d bytes\n", ucom->sc_portno, actlen);
 909                         usbd_xfer_set_frame_len(xfer, 0, actlen);
 910                         usbd_transfer_submit(xfer);
 911                 }
 912                 return;
 913
 914         default:                        /* Error */
 915                 if (error != USB_ERR_CANCELLED) {
 916                         /* try to clear stall first */
 917                         usbd_xfer_set_stall(xfer);
 918                         goto tr_setup;
 919                 }
 920                 return;
 921         }
 922 }
 923
 924 static void
 925 umcs7840_poll(struct ucom_softc *ucom)
 926 {
 927         struct umcs7840_softc *sc = ucom->sc_parent;
 928
 929         DPRINTF("Port %d poll\n", ucom->sc_portno);
 930         usbd_transfer_poll(sc->sc_ports[ucom->sc_portno].sc_xfer, UMCS7840_N_TRANSFERS);
 931         usbd_transfer_poll(&sc->sc_intr_xfer, 1);
 932 }
 933
 934 static usb_error_t
 935 umcs7840_get_reg_sync(struct umcs7840_softc *sc, uint8_t reg, uint8_t *data)
 936 {
 937         struct usb_device_request req;
 938         usb_error_t err;
 939         uint16_t len;
 940
 941         req.bmRequestType = UT_READ_VENDOR_DEVICE;
 942         req.bRequest = MCS7840_RDREQ;
 943         USETW(req.wValue, 0);
 944         USETW(req.wIndex, reg);
 945         USETW(req.wLength, UMCS7840_READ_LENGTH);
 946
 947         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, (void *)data, 0, &len, UMCS7840_CTRL_TIMEOUT);
 948         if (err == USB_ERR_NORMAL_COMPLETION && len != 1) {
 949                 device_printf(sc->sc_dev, "Reading register %d failed: invalid length %d\n", reg, len);
 950                 return (USB_ERR_INVAL);
 951         } else if (err)
 952                 device_printf(sc->sc_dev, "Reading register %d failed: %s\n", reg, usbd_errstr(err));
 953         return (err);
 954 }
 955
 956 static usb_error_t
 957 umcs7840_set_reg_sync(struct umcs7840_softc *sc, uint8_t reg, uint8_t data)
 958 {
 959         struct usb_device_request req;
 960         usb_error_t err;
 961
 962         req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
 963         req.bRequest = MCS7840_WRREQ;
 964         USETW(req.wValue, data);
 965         USETW(req.wIndex, reg);
 966         USETW(req.wLength, 0);
 967
 968         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, NULL, 0, NULL, UMCS7840_CTRL_TIMEOUT);
 969         if (err)
 970                 device_printf(sc->sc_dev, "Writing register %d failed: %s\n", reg, usbd_errstr(err));
 971
 972         return (err);
 973 }
 974
 975 static usb_error_t
 976 umcs7840_get_UART_reg_sync(struct umcs7840_softc *sc, uint8_t portno, uint8_t reg, uint8_t *data)
 977 {
 978         struct usb_device_request req;
 979         uint16_t wVal;
 980         usb_error_t err;
 981         uint16_t len;
 982
 983         /* portno is port number */
 984         wVal = ((uint16_t)(portno + 1)) << 8;
 985
 986         req.bmRequestType = UT_READ_VENDOR_DEVICE;
 987         req.bRequest = MCS7840_RDREQ;
 988         USETW(req.wValue, wVal);
 989         USETW(req.wIndex, reg);
 990         USETW(req.wLength, UMCS7840_READ_LENGTH);
 991
 992         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, (void *)data, 0, &len, UMCS7840_CTRL_TIMEOUT);
 993         if (err == USB_ERR_NORMAL_COMPLETION && len != 1) {
 994                 device_printf(sc->sc_dev, "Reading UART%d register %d failed: invalid length %d\n", portno, reg, len);
 995                 return (USB_ERR_INVAL);
 996         } else if (err)
 997                 device_printf(sc->sc_dev, "Reading UART%d register %d failed: %s\n", portno, reg, usbd_errstr(err));
 998         return (err);
 999 }
1000
1001 static usb_error_t
1002 umcs7840_set_UART_reg_sync(struct umcs7840_softc *sc, uint8_t portno, uint8_t reg, uint8_t data)
1003 {
1004         struct usb_device_request req;
1005         usb_error_t err;
1006         uint16_t wVal;
1007
1008         /* portno is port number */
1009         wVal = ((uint16_t)(portno + 1)) << 8 | data;
1010
1011         req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
1012         req.bRequest = MCS7840_WRREQ;
1013         USETW(req.wValue, wVal);
1014         USETW(req.wIndex, reg);
1015         USETW(req.wLength, 0);
1016
1017         err = usbd_do_request_proc(sc->sc_udev, &sc->sc_super_ucom.sc_tq, &req, NULL, 0, NULL, UMCS7840_CTRL_TIMEOUT);
1018         if (err)
1019                 device_printf(sc->sc_dev, "Writing UART%d register %d failed: %s\n", portno, reg, usbd_errstr(err));
1020         return (err);
1021 }
1022
1023 static usb_error_t
1024 umcs7840_set_baudrate(struct umcs7840_softc *sc, uint8_t portno, uint32_t rate)
1025 {
1026         usb_error_t err;
1027         uint16_t divisor;
1028         uint8_t clk;
1029         uint8_t data;
1030
1031         if (umcs7840_calc_baudrate(rate, &divisor, &clk)) {
1032                 DPRINTF("Port %d bad speed: %d\n", portno, rate);
1033                 return (-1);
1034         }
1035         if (divisor == 0 || (clk & MCS7840_DEV_SPx_CLOCK_MASK) != clk) {
1036                 DPRINTF("Port %d bad speed calculation: %d\n", portno, rate);
1037                 return (-1);
1038         }
1039         DPRINTF("Port %d set speed: %d (%02x / %d)\n", portno, rate, clk, divisor);
1040
1041         /* Set clock source for standard BAUD frequences */
1042         err = umcs7840_get_reg_sync(sc, umcs7840_port_registers[portno].reg_sp, &data);
1043         if (err)
1044                 return (err);
1045         data &= MCS7840_DEV_SPx_CLOCK_MASK;
1046         data |= clk;
1047         err = umcs7840_set_reg_sync(sc, umcs7840_port_registers[portno].reg_sp, data);
1048         if (err)
1049                 return (err);
1050
1051         /* Set divider */
1052         sc->sc_ports[portno].sc_lcr |= MCS7840_UART_LCR_DIVISORS;
1053         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_LCR, sc->sc_ports[portno].sc_lcr);
1054         if (err)
1055                 return (err);
1056
1057         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_DLL, (uint8_t)(divisor & 0xff));
1058         if (err)
1059                 return (err);
1060         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_DLM, (uint8_t)((divisor >> 8) & 0xff));
1061         if (err)
1062                 return (err);
1063
1064         /* Turn off access to DLL/DLM registers of UART */
1065         sc->sc_ports[portno].sc_lcr &= ~MCS7840_UART_LCR_DIVISORS;
1066         err = umcs7840_set_UART_reg_sync(sc, portno, MCS7840_UART_REG_LCR, sc->sc_ports[portno].sc_lcr);
1067         if (err)
1068                 return (err);
1069         return (0);
1070 }
1071
1072 /* Maximum speeds for standard frequences, when PLL is not used */
1073 static const uint32_t umcs7840_baudrate_divisors[] = {0, 115200, 230400, 403200, 460800, 806400, 921600, 1572864, 3145728,};
1074 static const uint8_t umcs7840_baudrate_divisors_len = sizeof(umcs7840_baudrate_divisors) / sizeof(umcs7840_baudrate_divisors[0]);
1075
1076 static usb_error_t
1077 umcs7840_calc_baudrate(uint32_t rate, uint16_t *divisor, uint8_t *clk)
1078 {
1079         uint8_t i = 0;
1080
1081         if (rate > umcs7840_baudrate_divisors[umcs7840_baudrate_divisors_len - 1])
1082                 return (-1);
1083
1084         for (i = 0; i < umcs7840_baudrate_divisors_len - 1 &&
1085             !(rate > umcs7840_baudrate_divisors[i] && rate <= umcs7840_baudrate_divisors[i + 1]); ++i);
1086         if (rate == 0)
1087                 *divisor = 1;   /* XXX */
1088         else
1089                 *divisor = umcs7840_baudrate_divisors[i + 1] / rate;
1090         /* 0x00 .. 0x70 */
1091         *clk = i << MCS7840_DEV_SPx_CLOCK_SHIFT;
1092         return (0);
1093 }