drivers/serial/serial_ks8695.c

   1 /*
   2  *  drivers/serial/serial_ks8695.c
   3  *
   4  *  Driver for KS8695 serial ports
   5  *
   6  *  Based on drivers/serial/serial_amba.c, by Kam Lee.
   7  *
   8  *  Copyright 2002-2005 Micrel Inc.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  */
  16 #include <linux/module.h>
  17 #include <linux/tty.h>
  18 #include <linux/ioport.h>
  19 #include <linux/init.h>
  20 #include <linux/serial.h>
  21 #include <linux/console.h>
  22 #include <linux/sysrq.h>
  23 #include <linux/device.h>
  24
  25 #include <asm/io.h>
  26 #include <asm/irq.h>
  27 #include <asm/mach/irq.h>
  28
  29 #include <mach/regs-uart.h>
  30 #include <mach/regs-irq.h>
  31
  32 #if defined(CONFIG_SERIAL_KS8695_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  33 #define SUPPORT_SYSRQ
  34 #endif
  35
  36 #include <linux/serial_core.h>
  37
  38
  39 #define SERIAL_KS8695_MAJOR     204
  40 #define SERIAL_KS8695_MINOR     16
  41 #define SERIAL_KS8695_DEVNAME   "ttyAM"
  42
  43 #define SERIAL_KS8695_NR        1
  44
  45 /*
  46  * Access macros for the KS8695 UART
  47  */
  48 #define UART_GET_CHAR(p)        (__raw_readl((p)->membase + KS8695_URRB) & 0xFF)
  49 #define UART_PUT_CHAR(p, c)     __raw_writel((c), (p)->membase + KS8695_URTH)
  50 #define UART_GET_FCR(p)         __raw_readl((p)->membase + KS8695_URFC)
  51 #define UART_PUT_FCR(p, c)      __raw_writel((c), (p)->membase + KS8695_URFC)
  52 #define UART_GET_MSR(p)         __raw_readl((p)->membase + KS8695_URMS)
  53 #define UART_GET_LSR(p)         __raw_readl((p)->membase + KS8695_URLS)
  54 #define UART_GET_LCR(p)         __raw_readl((p)->membase + KS8695_URLC)
  55 #define UART_PUT_LCR(p, c)      __raw_writel((c), (p)->membase + KS8695_URLC)
  56 #define UART_GET_MCR(p)         __raw_readl((p)->membase + KS8695_URMC)
  57 #define UART_PUT_MCR(p, c)      __raw_writel((c), (p)->membase + KS8695_URMC)
  58 #define UART_GET_BRDR(p)        __raw_readl((p)->membase + KS8695_URBD)
  59 #define UART_PUT_BRDR(p, c)     __raw_writel((c), (p)->membase + KS8695_URBD)
  60
  61 #define KS8695_CLR_TX_INT()     __raw_writel(1 << KS8695_IRQ_UART_TX, KS8695_IRQ_VA + KS8695_INTST)
  62
  63 #define UART_DUMMY_LSR_RX       0x100
  64 #define UART_PORT_SIZE          (KS8695_USR - KS8695_URRB + 4)
  65
  66 static inline int tx_enabled(struct uart_port *port)
  67 {
  68         return port->unused[0] & 1;
  69 }
  70
  71 static inline int rx_enabled(struct uart_port *port)
  72 {
  73         return port->unused[0] & 2;
  74 }
  75
  76 static inline int ms_enabled(struct uart_port *port)
  77 {
  78         return port->unused[0] & 4;
  79 }
  80
  81 static inline void ms_enable(struct uart_port *port, int enabled)
  82 {
  83         if(enabled)
  84                 port->unused[0] |= 4;
  85         else
  86                 port->unused[0] &= ~4;
  87 }
  88
  89 static inline void rx_enable(struct uart_port *port, int enabled)
  90 {
  91         if(enabled)
  92                 port->unused[0] |= 2;
  93         else
  94                 port->unused[0] &= ~2;
  95 }
  96
  97 static inline void tx_enable(struct uart_port *port, int enabled)
  98 {
  99         if(enabled)
 100                 port->unused[0] |= 1;
 101         else
 102                 port->unused[0] &= ~1;
 103 }
 104
 105
 106 #ifdef SUPPORT_SYSRQ
 107 static struct console ks8695_console;
 108 #endif
 109
 110 static void ks8695uart_stop_tx(struct uart_port *port)
 111 {
 112         if (tx_enabled(port)) {
 113                 disable_irq(KS8695_IRQ_UART_TX);
 114                 tx_enable(port, 0);
 115         }
 116 }
 117
 118 static void ks8695uart_start_tx(struct uart_port *port)
 119 {
 120         if (!tx_enabled(port)) {
 121                 enable_irq(KS8695_IRQ_UART_TX);
 122                 tx_enable(port, 1);
 123         }
 124 }
 125
 126 static void ks8695uart_stop_rx(struct uart_port *port)
 127 {
 128         if (rx_enabled(port)) {
 129                 disable_irq(KS8695_IRQ_UART_RX);
 130                 rx_enable(port, 0);
 131         }
 132 }
 133
 134 static void ks8695uart_enable_ms(struct uart_port *port)
 135 {
 136         if (!ms_enabled(port)) {
 137                 enable_irq(KS8695_IRQ_UART_MODEM_STATUS);
 138                 ms_enable(port,1);
 139         }
 140 }
 141
 142 static void ks8695uart_disable_ms(struct uart_port *port)
 143 {
 144         if (ms_enabled(port)) {
 145                 disable_irq(KS8695_IRQ_UART_MODEM_STATUS);
 146                 ms_enable(port,0);
 147         }
 148 }
 149
 150 static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id)
 151 {
 152         struct uart_port *port = dev_id;
 153         struct tty_struct *tty = port->info->port.tty;
 154         unsigned int status, ch, lsr, flg, max_count = 256;
 155
 156         status = UART_GET_LSR(port);            /* clears pending LSR interrupts */
 157         while ((status & URLS_URDR) && max_count--) {
 158                 ch = UART_GET_CHAR(port);
 159                 flg = TTY_NORMAL;
 160
 161                 port->icount.rx++;
 162
 163                 /*
 164                  * Note that the error handling code is
 165                  * out of the main execution path
 166                  */
 167                 lsr = UART_GET_LSR(port) | UART_DUMMY_LSR_RX;
 168                 if (unlikely(lsr & (URLS_URBI | URLS_URPE | URLS_URFE | URLS_URROE))) {
 169                         if (lsr & URLS_URBI) {
 170                                 lsr &= ~(URLS_URFE | URLS_URPE);
 171                                 port->icount.brk++;
 172                                 if (uart_handle_break(port))
 173                                         goto ignore_char;
 174                         }
 175                         if (lsr & URLS_URPE)
 176                                 port->icount.parity++;
 177                         if (lsr & URLS_URFE)
 178                                 port->icount.frame++;
 179                         if (lsr & URLS_URROE)
 180                                 port->icount.overrun++;
 181
 182                         lsr &= port->read_status_mask;
 183
 184                         if (lsr & URLS_URBI)
 185                                 flg = TTY_BREAK;
 186                         else if (lsr & URLS_URPE)
 187                                 flg = TTY_PARITY;
 188                         else if (lsr & URLS_URFE)
 189                                 flg = TTY_FRAME;
 190                 }
 191
 192                 if (uart_handle_sysrq_char(port, ch))
 193                         goto ignore_char;
 194
 195                 uart_insert_char(port, lsr, URLS_URROE, ch, flg);
 196
 197 ignore_char:
 198                 status = UART_GET_LSR(port);
 199         }
 200         tty_flip_buffer_push(tty);
 201
 202         return IRQ_HANDLED;
 203 }
 204
 205
 206 static irqreturn_t ks8695uart_tx_chars(int irq, void *dev_id)
 207 {
 208         struct uart_port *port = dev_id;
 209         struct circ_buf *xmit = &port->info->xmit;
 210         unsigned int count;
 211
 212         if (port->x_char) {
 213                 KS8695_CLR_TX_INT();
 214                 UART_PUT_CHAR(port, port->x_char);
 215                 port->icount.tx++;
 216                 port->x_char = 0;
 217                 return IRQ_HANDLED;
 218         }
 219
 220         if (uart_tx_stopped(port) || uart_circ_empty(xmit)) {
 221                 ks8695uart_stop_tx(port);
 222                 return IRQ_HANDLED;
 223         }
 224
 225         count = 16;     /* fifo size */
 226         while (!uart_circ_empty(xmit) && (count-- > 0)) {
 227                 KS8695_CLR_TX_INT();
 228                 UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
 229
 230                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 231                 port->icount.tx++;
 232         }
 233
 234         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 235                 uart_write_wakeup(port);
 236
 237         if (uart_circ_empty(xmit))
 238                 ks8695uart_stop_tx(port);
 239
 240         return IRQ_HANDLED;
 241 }
 242
 243 static irqreturn_t ks8695uart_modem_status(int irq, void *dev_id)
 244 {
 245         struct uart_port *port = dev_id;
 246         unsigned int status;
 247
 248         /*
 249          * clear modem interrupt by reading MSR
 250          */
 251         status = UART_GET_MSR(port);
 252
 253         if (status & URMS_URDDCD)
 254                 uart_handle_dcd_change(port, status & URMS_URDDCD);
 255
 256         if (status & URMS_URDDST)
 257                 port->icount.dsr++;
 258
 259         if (status & URMS_URDCTS)
 260                 uart_handle_cts_change(port, status & URMS_URDCTS);
 261
 262         if (status & URMS_URTERI)
 263                 port->icount.rng++;
 264
 265         wake_up_interruptible(&port->info->delta_msr_wait);
 266
 267         return IRQ_HANDLED;
 268 }
 269
 270 static unsigned int ks8695uart_tx_empty(struct uart_port *port)
 271 {
 272         return (UART_GET_LSR(port) & URLS_URTE) ? TIOCSER_TEMT : 0;
 273 }
 274
 275 static unsigned int ks8695uart_get_mctrl(struct uart_port *port)
 276 {
 277         unsigned int result = 0;
 278         unsigned int status;
 279
 280         status = UART_GET_MSR(port);
 281         if (status & URMS_URDCD)
 282                 result |= TIOCM_CAR;
 283         if (status & URMS_URDSR)
 284                 result |= TIOCM_DSR;
 285         if (status & URMS_URCTS)
 286                 result |= TIOCM_CTS;
 287         if (status & URMS_URRI)
 288                 result |= TIOCM_RI;
 289
 290         return result;
 291 }
 292
 293 static void ks8695uart_set_mctrl(struct uart_port *port, u_int mctrl)
 294 {
 295         unsigned int mcr;
 296
 297         mcr = UART_GET_MCR(port);
 298         if (mctrl & TIOCM_RTS)
 299                 mcr |= URMC_URRTS;
 300         else
 301                 mcr &= ~URMC_URRTS;
 302
 303         if (mctrl & TIOCM_DTR)
 304                 mcr |= URMC_URDTR;
 305         else
 306                 mcr &= ~URMC_URDTR;
 307
 308         UART_PUT_MCR(port, mcr);
 309 }
 310
 311 static void ks8695uart_break_ctl(struct uart_port *port, int break_state)
 312 {
 313         unsigned int lcr;
 314
 315         lcr = UART_GET_LCR(port);
 316
 317         if (break_state == -1)
 318                 lcr |= URLC_URSBC;
 319         else
 320                 lcr &= ~URLC_URSBC;
 321
 322         UART_PUT_LCR(port, lcr);
 323 }
 324
 325 static int ks8695uart_startup(struct uart_port *port)
 326 {
 327         int retval;
 328
 329         set_irq_flags(KS8695_IRQ_UART_TX, IRQF_VALID | IRQF_NOAUTOEN);
 330         tx_enable(port, 0);
 331         rx_enable(port, 1);
 332         ms_enable(port, 1);
 333
 334         /*
 335          * Allocate the IRQ
 336          */
 337         retval = request_irq(KS8695_IRQ_UART_TX, ks8695uart_tx_chars, IRQF_DISABLED, "UART TX", port);
 338         if (retval)
 339                 goto err_tx;
 340
 341         retval = request_irq(KS8695_IRQ_UART_RX, ks8695uart_rx_chars, IRQF_DISABLED, "UART RX", port);
 342         if (retval)
 343                 goto err_rx;
 344
 345         retval = request_irq(KS8695_IRQ_UART_LINE_STATUS, ks8695uart_rx_chars, IRQF_DISABLED, "UART LineStatus", port);
 346         if (retval)
 347                 goto err_ls;
 348
 349         retval = request_irq(KS8695_IRQ_UART_MODEM_STATUS, ks8695uart_modem_status, IRQF_DISABLED, "UART ModemStatus", port);
 350         if (retval)
 351                 goto err_ms;
 352
 353         return 0;
 354
 355 err_ms:
 356         free_irq(KS8695_IRQ_UART_LINE_STATUS, port);
 357 err_ls:
 358         free_irq(KS8695_IRQ_UART_RX, port);
 359 err_rx:
 360         free_irq(KS8695_IRQ_UART_TX, port);
 361 err_tx:
 362         return retval;
 363 }
 364
 365 static void ks8695uart_shutdown(struct uart_port *port)
 366 {
 367         /*
 368          * Free the interrupt
 369          */
 370         free_irq(KS8695_IRQ_UART_RX, port);
 371         free_irq(KS8695_IRQ_UART_TX, port);
 372         free_irq(KS8695_IRQ_UART_MODEM_STATUS, port);
 373         free_irq(KS8695_IRQ_UART_LINE_STATUS, port);
 374
 375         /* disable break condition and fifos */
 376         UART_PUT_LCR(port, UART_GET_LCR(port) & ~URLC_URSBC);
 377         UART_PUT_FCR(port, UART_GET_FCR(port) & ~URFC_URFE);
 378 }
 379
 380 static void ks8695uart_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old)
 381 {
 382         unsigned int lcr, fcr = 0;
 383         unsigned long flags;
 384         unsigned int baud, quot;
 385
 386         /*
 387          * Ask the core to calculate the divisor for us.
 388          */
 389         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 390         quot = uart_get_divisor(port, baud);
 391
 392         switch (termios->c_cflag & CSIZE) {
 393         case CS5:
 394                 lcr = URCL_5;
 395                 break;
 396         case CS6:
 397                 lcr = URCL_6;
 398                 break;
 399         case CS7:
 400                 lcr = URCL_7;
 401                 break;
 402         default:
 403                 lcr = URCL_8;
 404                 break;
 405         }
 406
 407         /* stop bits */
 408         if (termios->c_cflag & CSTOPB)
 409                 lcr |= URLC_URSB;
 410
 411         /* parity */
 412         if (termios->c_cflag & PARENB) {
 413                 if (termios->c_cflag & CMSPAR) {        /* Mark or Space parity */
 414                         if (termios->c_cflag & PARODD)
 415                                 lcr |= URPE_MARK;
 416                         else
 417                                 lcr |= URPE_SPACE;
 418                 }
 419                 else if (termios->c_cflag & PARODD)
 420                         lcr |= URPE_ODD;
 421                 else
 422                         lcr |= URPE_EVEN;
 423         }
 424
 425         if (port->fifosize > 1)
 426                 fcr = URFC_URFRT_8 | URFC_URTFR | URFC_URRFR | URFC_URFE;
 427
 428         spin_lock_irqsave(&port->lock, flags);
 429
 430         /*
 431          * Update the per-port timeout.
 432          */
 433         uart_update_timeout(port, termios->c_cflag, baud);
 434
 435         port->read_status_mask = URLS_URROE;
 436         if (termios->c_iflag & INPCK)
 437                 port->read_status_mask |= (URLS_URFE | URLS_URPE);
 438         if (termios->c_iflag & (BRKINT | PARMRK))
 439                 port->read_status_mask |= URLS_URBI;
 440
 441         /*
 442          * Characters to ignore
 443          */
 444         port->ignore_status_mask = 0;
 445         if (termios->c_iflag & IGNPAR)
 446                 port->ignore_status_mask |= (URLS_URFE | URLS_URPE);
 447         if (termios->c_iflag & IGNBRK) {
 448                 port->ignore_status_mask |= URLS_URBI;
 449                 /*
 450                  * If we're ignoring parity and break indicators,
 451                  * ignore overruns too (for real raw support).
 452                  */
 453                 if (termios->c_iflag & IGNPAR)
 454                         port->ignore_status_mask |= URLS_URROE;
 455         }
 456
 457         /*
 458          * Ignore all characters if CREAD is not set.
 459          */
 460         if ((termios->c_cflag & CREAD) == 0)
 461                 port->ignore_status_mask |= UART_DUMMY_LSR_RX;
 462
 463         /* first, disable everything */
 464         if (UART_ENABLE_MS(port, termios->c_cflag))
 465                 ks8695uart_enable_ms(port);
 466         else
 467                 ks8695uart_disable_ms(port);
 468
 469         /* Set baud rate */
 470         UART_PUT_BRDR(port, quot);
 471
 472         UART_PUT_LCR(port, lcr);
 473         UART_PUT_FCR(port, fcr);
 474
 475         spin_unlock_irqrestore(&port->lock, flags);
 476 }
 477
 478 static const char *ks8695uart_type(struct uart_port *port)
 479 {
 480         return port->type == PORT_KS8695 ? "KS8695" : NULL;
 481 }
 482
 483 /*
 484  * Release the memory region(s) being used by 'port'
 485  */
 486 static void ks8695uart_release_port(struct uart_port *port)
 487 {
 488         release_mem_region(port->mapbase, UART_PORT_SIZE);
 489 }
 490
 491 /*
 492  * Request the memory region(s) being used by 'port'
 493  */
 494 static int ks8695uart_request_port(struct uart_port *port)
 495 {
 496         return request_mem_region(port->mapbase, UART_PORT_SIZE,
 497                         "serial_ks8695") != NULL ? 0 : -EBUSY;
 498 }
 499
 500 /*
 501  * Configure/autoconfigure the port.
 502  */
 503 static void ks8695uart_config_port(struct uart_port *port, int flags)
 504 {
 505         if (flags & UART_CONFIG_TYPE) {
 506                 port->type = PORT_KS8695;
 507                 ks8695uart_request_port(port);
 508         }
 509 }
 510
 511 /*
 512  * verify the new serial_struct (for TIOCSSERIAL).
 513  */
 514 static int ks8695uart_verify_port(struct uart_port *port, struct serial_struct *ser)
 515 {
 516         int ret = 0;
 517
 518         if (ser->type != PORT_UNKNOWN && ser->type != PORT_KS8695)
 519                 ret = -EINVAL;
 520         if (ser->irq != port->irq)
 521                 ret = -EINVAL;
 522         if (ser->baud_base < 9600)
 523                 ret = -EINVAL;
 524         return ret;
 525 }
 526
 527 static struct uart_ops ks8695uart_pops = {
 528         .tx_empty       = ks8695uart_tx_empty,
 529         .set_mctrl      = ks8695uart_set_mctrl,
 530         .get_mctrl      = ks8695uart_get_mctrl,
 531         .stop_tx        = ks8695uart_stop_tx,
 532         .start_tx       = ks8695uart_start_tx,
 533         .stop_rx        = ks8695uart_stop_rx,
 534         .enable_ms      = ks8695uart_enable_ms,
 535         .break_ctl      = ks8695uart_break_ctl,
 536         .startup        = ks8695uart_startup,
 537         .shutdown       = ks8695uart_shutdown,
 538         .set_termios    = ks8695uart_set_termios,
 539         .type           = ks8695uart_type,
 540         .release_port   = ks8695uart_release_port,
 541         .request_port   = ks8695uart_request_port,
 542         .config_port    = ks8695uart_config_port,
 543         .verify_port    = ks8695uart_verify_port,
 544 };
 545
 546 static struct uart_port ks8695uart_ports[SERIAL_KS8695_NR] = {
 547         {
 548                 .membase        = (void *) KS8695_UART_VA,
 549                 .mapbase        = KS8695_UART_VA,
 550                 .iotype         = SERIAL_IO_MEM,
 551                 .irq            = KS8695_IRQ_UART_TX,
 552                 .uartclk        = KS8695_CLOCK_RATE * 16,
 553                 .fifosize       = 16,
 554                 .ops            = &ks8695uart_pops,
 555                 .flags          = ASYNC_BOOT_AUTOCONF,
 556                 .line           = 0,
 557         }
 558 };
 559
 560 #ifdef CONFIG_SERIAL_KS8695_CONSOLE
 561 static void ks8695_console_putchar(struct uart_port *port, int ch)
 562 {
 563         while (!(UART_GET_LSR(port) & URLS_URTHRE))
 564                 barrier();
 565
 566         UART_PUT_CHAR(port, ch);
 567 }
 568
 569 static void ks8695_console_write(struct console *co, const char *s, u_int count)
 570 {
 571         struct uart_port *port = ks8695uart_ports + co->index;
 572
 573         uart_console_write(port, s, count, ks8695_console_putchar);
 574 }
 575
 576 static void __init ks8695_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits)
 577 {
 578         unsigned int lcr;
 579
 580         lcr = UART_GET_LCR(port);
 581
 582         switch (lcr & URLC_PARITY) {
 583                 case URPE_ODD:
 584                         *parity = 'o';
 585                         break;
 586                 case URPE_EVEN:
 587                         *parity = 'e';
 588                         break;
 589                 default:
 590                         *parity = 'n';
 591         }
 592
 593         switch (lcr & URLC_URCL) {
 594                 case URCL_5:
 595                         *bits = 5;
 596                         break;
 597                 case URCL_6:
 598                         *bits = 6;
 599                         break;
 600                 case URCL_7:
 601                         *bits = 7;
 602                         break;
 603                 default:
 604                         *bits = 8;
 605         }
 606
 607         *baud = port->uartclk / (UART_GET_BRDR(port) & 0x0FFF);
 608         *baud /= 16;
 609         *baud &= 0xFFFFFFF0;
 610 }
 611
 612 static int __init ks8695_console_setup(struct console *co, char *options)
 613 {
 614         struct uart_port *port;
 615         int baud = 115200;
 616         int bits = 8;
 617         int parity = 'n';
 618         int flow = 'n';
 619
 620         /*
 621          * Check whether an invalid uart number has been specified, and
 622          * if so, search for the first available port that does have
 623          * console support.
 624          */
 625         port = uart_get_console(ks8695uart_ports, SERIAL_KS8695_NR, co);
 626
 627         if (options)
 628                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 629         else
 630                 ks8695_console_get_options(port, &baud, &parity, &bits);
 631
 632         return uart_set_options(port, co, baud, parity, bits, flow);
 633 }
 634
 635 static struct uart_driver ks8695_reg;
 636
 637 static struct console ks8695_console = {
 638         .name           = SERIAL_KS8695_DEVNAME,
 639         .write          = ks8695_console_write,
 640         .device         = uart_console_device,
 641         .setup          = ks8695_console_setup,
 642         .flags          = CON_PRINTBUFFER,
 643         .index          = -1,
 644         .data           = &ks8695_reg,
 645 };
 646
 647 static int __init ks8695_console_init(void)
 648 {
 649         register_console(&ks8695_console);
 650         return 0;
 651 }
 652
 653 console_initcall(ks8695_console_init);
 654
 655 #define KS8695_CONSOLE  &ks8695_console
 656 #else
 657 #define KS8695_CONSOLE  NULL
 658 #endif
 659
 660 static struct uart_driver ks8695_reg = {
 661         .owner                  = THIS_MODULE,
 662         .driver_name            = "serial_ks8695",
 663         .dev_name               = SERIAL_KS8695_DEVNAME,
 664         .major                  = SERIAL_KS8695_MAJOR,
 665         .minor                  = SERIAL_KS8695_MINOR,
 666         .nr                     = SERIAL_KS8695_NR,
 667         .cons                   = KS8695_CONSOLE,
 668 };
 669
 670 static int __init ks8695uart_init(void)
 671 {
 672         int i, ret;
 673
 674         printk(KERN_INFO "Serial: Micrel KS8695 UART driver\n");
 675
 676         ret = uart_register_driver(&ks8695_reg);
 677         if (ret)
 678                 return ret;
 679
 680         for (i = 0; i < SERIAL_KS8695_NR; i++)
 681                 uart_add_one_port(&ks8695_reg, &ks8695uart_ports[0]);
 682
 683         return 0;
 684 }
 685
 686 static void __exit ks8695uart_exit(void)
 687 {
 688         int i;
 689
 690         for (i = 0; i < SERIAL_KS8695_NR; i++)
 691                 uart_remove_one_port(&ks8695_reg, &ks8695uart_ports[0]);
 692         uart_unregister_driver(&ks8695_reg);
 693 }
 694
 695 module_init(ks8695uart_init);
 696 module_exit(ks8695uart_exit);
 697
 698 MODULE_DESCRIPTION("KS8695 serial port driver");
 699 MODULE_AUTHOR("Micrel Inc.");
 700 MODULE_LICENSE("GPL");