drivers/tty/serial/serial_ks8695.c

   1 /*
   2  *  Driver for KS8695 serial ports
   3  *
   4  *  Based on drivers/serial/serial_amba.c, by Kam Lee.
   5  *
   6  *  Copyright 2002-2005 Micrel Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  */
  14 #include <linux/module.h>
  15 #include <linux/tty.h>
  16 #include <linux/tty_flip.h>
  17 #include <linux/ioport.h>
  18 #include <linux/init.h>
  19 #include <linux/serial.h>
  20 #include <linux/console.h>
  21 #include <linux/sysrq.h>
  22 #include <linux/device.h>
  23
  24 #include <asm/io.h>
  25 #include <asm/irq.h>
  26 #include <asm/mach/irq.h>
  27
  28 #include <mach/regs-uart.h>
  29 #include <mach/regs-irq.h>
  30
  31 #if defined(CONFIG_SERIAL_KS8695_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  32 #define SUPPORT_SYSRQ
  33 #endif
  34
  35 #include <linux/serial_core.h>
  36
  37
  38 #define SERIAL_KS8695_MAJOR     204
  39 #define SERIAL_KS8695_MINOR     16
  40 #define SERIAL_KS8695_DEVNAME   "ttyAM"
  41
  42 #define SERIAL_KS8695_NR        1
  43
  44 /*
  45  * Access macros for the KS8695 UART
  46  */
  47 #define UART_GET_CHAR(p)        (__raw_readl((p)->membase + KS8695_URRB) & 0xFF)
  48 #define UART_PUT_CHAR(p, c)     __raw_writel((c), (p)->membase + KS8695_URTH)
  49 #define UART_GET_FCR(p)         __raw_readl((p)->membase + KS8695_URFC)
  50 #define UART_PUT_FCR(p, c)      __raw_writel((c), (p)->membase + KS8695_URFC)
  51 #define UART_GET_MSR(p)         __raw_readl((p)->membase + KS8695_URMS)
  52 #define UART_GET_LSR(p)         __raw_readl((p)->membase + KS8695_URLS)
  53 #define UART_GET_LCR(p)         __raw_readl((p)->membase + KS8695_URLC)
  54 #define UART_PUT_LCR(p, c)      __raw_writel((c), (p)->membase + KS8695_URLC)
  55 #define UART_GET_MCR(p)         __raw_readl((p)->membase + KS8695_URMC)
  56 #define UART_PUT_MCR(p, c)      __raw_writel((c), (p)->membase + KS8695_URMC)
  57 #define UART_GET_BRDR(p)        __raw_readl((p)->membase + KS8695_URBD)
  58 #define UART_PUT_BRDR(p, c)     __raw_writel((c), (p)->membase + KS8695_URBD)
  59
  60 #define KS8695_CLR_TX_INT()     __raw_writel(1 << KS8695_IRQ_UART_TX, KS8695_IRQ_VA + KS8695_INTST)
  61
  62 #define UART_DUMMY_LSR_RX       0x100
  63 #define UART_PORT_SIZE          (KS8695_USR - KS8695_URRB + 4)
  64
  65 static inline int tx_enabled(struct uart_port *port)
  66 {
  67         return port->unused[0] & 1;
  68 }
  69
  70 static inline int rx_enabled(struct uart_port *port)
  71 {
  72         return port->unused[0] & 2;
  73 }
  74
  75 static inline int ms_enabled(struct uart_port *port)
  76 {
  77         return port->unused[0] & 4;
  78 }
  79
  80 static inline void ms_enable(struct uart_port *port, int enabled)
  81 {
  82         if(enabled)
  83                 port->unused[0] |= 4;
  84         else
  85                 port->unused[0] &= ~4;
  86 }
  87
  88 static inline void rx_enable(struct uart_port *port, int enabled)
  89 {
  90         if(enabled)
  91                 port->unused[0] |= 2;
  92         else
  93                 port->unused[0] &= ~2;
  94 }
  95
  96 static inline void tx_enable(struct uart_port *port, int enabled)
  97 {
  98         if(enabled)
  99                 port->unused[0] |= 1;
 100         else
 101                 port->unused[0] &= ~1;
 102 }
 103
 104
 105 #ifdef SUPPORT_SYSRQ
 106 static struct console ks8695_console;
 107 #endif
 108
 109 static void ks8695uart_stop_tx(struct uart_port *port)
 110 {
 111         if (tx_enabled(port)) {
 112                 /* use disable_irq_nosync() and not disable_irq() to avoid self
 113                  * imposed deadlock by not waiting for irq handler to end,
 114                  * since this ks8695uart_stop_tx() is called from interrupt context.
 115                  */
 116                 disable_irq_nosync(KS8695_IRQ_UART_TX);
 117                 tx_enable(port, 0);
 118         }
 119 }
 120
 121 static void ks8695uart_start_tx(struct uart_port *port)
 122 {
 123         if (!tx_enabled(port)) {
 124                 enable_irq(KS8695_IRQ_UART_TX);
 125                 tx_enable(port, 1);
 126         }
 127 }
 128
 129 static void ks8695uart_stop_rx(struct uart_port *port)
 130 {
 131         if (rx_enabled(port)) {
 132                 disable_irq(KS8695_IRQ_UART_RX);
 133                 rx_enable(port, 0);
 134         }
 135 }
 136
 137 static void ks8695uart_enable_ms(struct uart_port *port)
 138 {
 139         if (!ms_enabled(port)) {
 140                 enable_irq(KS8695_IRQ_UART_MODEM_STATUS);
 141                 ms_enable(port,1);
 142         }
 143 }
 144
 145 static void ks8695uart_disable_ms(struct uart_port *port)
 146 {
 147         if (ms_enabled(port)) {
 148                 disable_irq(KS8695_IRQ_UART_MODEM_STATUS);
 149                 ms_enable(port,0);
 150         }
 151 }
 152
 153 static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id)
 154 {
 155         struct uart_port *port = dev_id;
 156         unsigned int status, ch, lsr, flg, max_count = 256;
 157
 158         status = UART_GET_LSR(port);            /* clears pending LSR interrupts */
 159         while ((status & URLS_URDR) && max_count--) {
 160                 ch = UART_GET_CHAR(port);
 161                 flg = TTY_NORMAL;
 162
 163                 port->icount.rx++;
 164
 165                 /*
 166                  * Note that the error handling code is
 167                  * out of the main execution path
 168                  */
 169                 lsr = UART_GET_LSR(port) | UART_DUMMY_LSR_RX;
 170                 if (unlikely(lsr & (URLS_URBI | URLS_URPE | URLS_URFE | URLS_URROE))) {
 171                         if (lsr & URLS_URBI) {
 172                                 lsr &= ~(URLS_URFE | URLS_URPE);
 173                                 port->icount.brk++;
 174                                 if (uart_handle_break(port))
 175                                         goto ignore_char;
 176                         }
 177                         if (lsr & URLS_URPE)
 178                                 port->icount.parity++;
 179                         if (lsr & URLS_URFE)
 180                                 port->icount.frame++;
 181                         if (lsr & URLS_URROE)
 182                                 port->icount.overrun++;
 183
 184                         lsr &= port->read_status_mask;
 185
 186                         if (lsr & URLS_URBI)
 187                                 flg = TTY_BREAK;
 188                         else if (lsr & URLS_URPE)
 189                                 flg = TTY_PARITY;
 190                         else if (lsr & URLS_URFE)
 191                                 flg = TTY_FRAME;
 192                 }
 193
 194                 if (uart_handle_sysrq_char(port, ch))
 195                         goto ignore_char;
 196
 197                 uart_insert_char(port, lsr, URLS_URROE, ch, flg);
 198
 199 ignore_char:
 200                 status = UART_GET_LSR(port);
 201         }
 202         tty_flip_buffer_push(&port->state->port);
 203
 204         return IRQ_HANDLED;
 205 }
 206
 207
 208 static irqreturn_t ks8695uart_tx_chars(int irq, void *dev_id)
 209 {
 210         struct uart_port *port = dev_id;
 211         struct circ_buf *xmit = &port->state->xmit;
 212         unsigned int count;
 213
 214         if (port->x_char) {
 215                 KS8695_CLR_TX_INT();
 216                 UART_PUT_CHAR(port, port->x_char);
 217                 port->icount.tx++;
 218                 port->x_char = 0;
 219                 return IRQ_HANDLED;
 220         }
 221
 222         if (uart_tx_stopped(port) || uart_circ_empty(xmit)) {
 223                 ks8695uart_stop_tx(port);
 224                 return IRQ_HANDLED;
 225         }
 226
 227         count = 16;     /* fifo size */
 228         while (!uart_circ_empty(xmit) && (count-- > 0)) {
 229                 KS8695_CLR_TX_INT();
 230                 UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
 231
 232                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 233                 port->icount.tx++;
 234         }
 235
 236         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 237                 uart_write_wakeup(port);
 238
 239         if (uart_circ_empty(xmit))
 240                 ks8695uart_stop_tx(port);
 241
 242         return IRQ_HANDLED;
 243 }
 244
 245 static irqreturn_t ks8695uart_modem_status(int irq, void *dev_id)
 246 {
 247         struct uart_port *port = dev_id;
 248         unsigned int status;
 249
 250         /*
 251          * clear modem interrupt by reading MSR
 252          */
 253         status = UART_GET_MSR(port);
 254
 255         if (status & URMS_URDDCD)
 256                 uart_handle_dcd_change(port, status & URMS_URDDCD);
 257
 258         if (status & URMS_URDDST)
 259                 port->icount.dsr++;
 260
 261         if (status & URMS_URDCTS)
 262                 uart_handle_cts_change(port, status & URMS_URDCTS);
 263
 264         if (status & URMS_URTERI)
 265                 port->icount.rng++;
 266
 267         wake_up_interruptible(&port->state->port.delta_msr_wait);
 268
 269         return IRQ_HANDLED;
 270 }
 271
 272 static unsigned int ks8695uart_tx_empty(struct uart_port *port)
 273 {
 274         return (UART_GET_LSR(port) & URLS_URTE) ? TIOCSER_TEMT : 0;
 275 }
 276
 277 static unsigned int ks8695uart_get_mctrl(struct uart_port *port)
 278 {
 279         unsigned int result = 0;
 280         unsigned int status;
 281
 282         status = UART_GET_MSR(port);
 283         if (status & URMS_URDCD)
 284                 result |= TIOCM_CAR;
 285         if (status & URMS_URDSR)
 286                 result |= TIOCM_DSR;
 287         if (status & URMS_URCTS)
 288                 result |= TIOCM_CTS;
 289         if (status & URMS_URRI)
 290                 result |= TIOCM_RI;
 291
 292         return result;
 293 }
 294
 295 static void ks8695uart_set_mctrl(struct uart_port *port, u_int mctrl)
 296 {
 297         unsigned int mcr;
 298
 299         mcr = UART_GET_MCR(port);
 300         if (mctrl & TIOCM_RTS)
 301                 mcr |= URMC_URRTS;
 302         else
 303                 mcr &= ~URMC_URRTS;
 304
 305         if (mctrl & TIOCM_DTR)
 306                 mcr |= URMC_URDTR;
 307         else
 308                 mcr &= ~URMC_URDTR;
 309
 310         UART_PUT_MCR(port, mcr);
 311 }
 312
 313 static void ks8695uart_break_ctl(struct uart_port *port, int break_state)
 314 {
 315         unsigned int lcr;
 316
 317         lcr = UART_GET_LCR(port);
 318
 319         if (break_state == -1)
 320                 lcr |= URLC_URSBC;
 321         else
 322                 lcr &= ~URLC_URSBC;
 323
 324         UART_PUT_LCR(port, lcr);
 325 }
 326
 327 static int ks8695uart_startup(struct uart_port *port)
 328 {
 329         int retval;
 330
 331         set_irq_flags(KS8695_IRQ_UART_TX, IRQF_VALID | IRQF_NOAUTOEN);
 332         tx_enable(port, 0);
 333         rx_enable(port, 1);
 334         ms_enable(port, 1);
 335
 336         /*
 337          * Allocate the IRQ
 338          */
 339         retval = request_irq(KS8695_IRQ_UART_TX, ks8695uart_tx_chars, 0, "UART TX", port);
 340         if (retval)
 341                 goto err_tx;
 342
 343         retval = request_irq(KS8695_IRQ_UART_RX, ks8695uart_rx_chars, 0, "UART RX", port);
 344         if (retval)
 345                 goto err_rx;
 346
 347         retval = request_irq(KS8695_IRQ_UART_LINE_STATUS, ks8695uart_rx_chars, 0, "UART LineStatus", port);
 348         if (retval)
 349                 goto err_ls;
 350
 351         retval = request_irq(KS8695_IRQ_UART_MODEM_STATUS, ks8695uart_modem_status, 0, "UART ModemStatus", port);
 352         if (retval)
 353                 goto err_ms;
 354
 355         return 0;
 356
 357 err_ms:
 358         free_irq(KS8695_IRQ_UART_LINE_STATUS, port);
 359 err_ls:
 360         free_irq(KS8695_IRQ_UART_RX, port);
 361 err_rx:
 362         free_irq(KS8695_IRQ_UART_TX, port);
 363 err_tx:
 364         return retval;
 365 }
 366
 367 static void ks8695uart_shutdown(struct uart_port *port)
 368 {
 369         /*
 370          * Free the interrupt
 371          */
 372         free_irq(KS8695_IRQ_UART_RX, port);
 373         free_irq(KS8695_IRQ_UART_TX, port);
 374         free_irq(KS8695_IRQ_UART_MODEM_STATUS, port);
 375         free_irq(KS8695_IRQ_UART_LINE_STATUS, port);
 376
 377         /* disable break condition and fifos */
 378         UART_PUT_LCR(port, UART_GET_LCR(port) & ~URLC_URSBC);
 379         UART_PUT_FCR(port, UART_GET_FCR(port) & ~URFC_URFE);
 380 }
 381
 382 static void ks8695uart_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old)
 383 {
 384         unsigned int lcr, fcr = 0;
 385         unsigned long flags;
 386         unsigned int baud, quot;
 387
 388         /*
 389          * Ask the core to calculate the divisor for us.
 390          */
 391         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 392         quot = uart_get_divisor(port, baud);
 393
 394         switch (termios->c_cflag & CSIZE) {
 395         case CS5:
 396                 lcr = URCL_5;
 397                 break;
 398         case CS6:
 399                 lcr = URCL_6;
 400                 break;
 401         case CS7:
 402                 lcr = URCL_7;
 403                 break;
 404         default:
 405                 lcr = URCL_8;
 406                 break;
 407         }
 408
 409         /* stop bits */
 410         if (termios->c_cflag & CSTOPB)
 411                 lcr |= URLC_URSB;
 412
 413         /* parity */
 414         if (termios->c_cflag & PARENB) {
 415                 if (termios->c_cflag & CMSPAR) {        /* Mark or Space parity */
 416                         if (termios->c_cflag & PARODD)
 417                                 lcr |= URPE_MARK;
 418                         else
 419                                 lcr |= URPE_SPACE;
 420                 }
 421                 else if (termios->c_cflag & PARODD)
 422                         lcr |= URPE_ODD;
 423                 else
 424                         lcr |= URPE_EVEN;
 425         }
 426
 427         if (port->fifosize > 1)
 428                 fcr = URFC_URFRT_8 | URFC_URTFR | URFC_URRFR | URFC_URFE;
 429
 430         spin_lock_irqsave(&port->lock, flags);
 431
 432         /*
 433          * Update the per-port timeout.
 434          */
 435         uart_update_timeout(port, termios->c_cflag, baud);
 436
 437         port->read_status_mask = URLS_URROE;
 438         if (termios->c_iflag & INPCK)
 439                 port->read_status_mask |= (URLS_URFE | URLS_URPE);
 440         if (termios->c_iflag & (BRKINT | PARMRK))
 441                 port->read_status_mask |= URLS_URBI;
 442
 443         /*
 444          * Characters to ignore
 445          */
 446         port->ignore_status_mask = 0;
 447         if (termios->c_iflag & IGNPAR)
 448                 port->ignore_status_mask |= (URLS_URFE | URLS_URPE);
 449         if (termios->c_iflag & IGNBRK) {
 450                 port->ignore_status_mask |= URLS_URBI;
 451                 /*
 452                  * If we're ignoring parity and break indicators,
 453                  * ignore overruns too (for real raw support).
 454                  */
 455                 if (termios->c_iflag & IGNPAR)
 456                         port->ignore_status_mask |= URLS_URROE;
 457         }
 458
 459         /*
 460          * Ignore all characters if CREAD is not set.
 461          */
 462         if ((termios->c_cflag & CREAD) == 0)
 463                 port->ignore_status_mask |= UART_DUMMY_LSR_RX;
 464
 465         /* first, disable everything */
 466         if (UART_ENABLE_MS(port, termios->c_cflag))
 467                 ks8695uart_enable_ms(port);
 468         else
 469                 ks8695uart_disable_ms(port);
 470
 471         /* Set baud rate */
 472         UART_PUT_BRDR(port, quot);
 473
 474         UART_PUT_LCR(port, lcr);
 475         UART_PUT_FCR(port, fcr);
 476
 477         spin_unlock_irqrestore(&port->lock, flags);
 478 }
 479
 480 static const char *ks8695uart_type(struct uart_port *port)
 481 {
 482         return port->type == PORT_KS8695 ? "KS8695" : NULL;
 483 }
 484
 485 /*
 486  * Release the memory region(s) being used by 'port'
 487  */
 488 static void ks8695uart_release_port(struct uart_port *port)
 489 {
 490         release_mem_region(port->mapbase, UART_PORT_SIZE);
 491 }
 492
 493 /*
 494  * Request the memory region(s) being used by 'port'
 495  */
 496 static int ks8695uart_request_port(struct uart_port *port)
 497 {
 498         return request_mem_region(port->mapbase, UART_PORT_SIZE,
 499                         "serial_ks8695") != NULL ? 0 : -EBUSY;
 500 }
 501
 502 /*
 503  * Configure/autoconfigure the port.
 504  */
 505 static void ks8695uart_config_port(struct uart_port *port, int flags)
 506 {
 507         if (flags & UART_CONFIG_TYPE) {
 508                 port->type = PORT_KS8695;
 509                 ks8695uart_request_port(port);
 510         }
 511 }
 512
 513 /*
 514  * verify the new serial_struct (for TIOCSSERIAL).
 515  */
 516 static int ks8695uart_verify_port(struct uart_port *port, struct serial_struct *ser)
 517 {
 518         int ret = 0;
 519
 520         if (ser->type != PORT_UNKNOWN && ser->type != PORT_KS8695)
 521                 ret = -EINVAL;
 522         if (ser->irq != port->irq)
 523                 ret = -EINVAL;
 524         if (ser->baud_base < 9600)
 525                 ret = -EINVAL;
 526         return ret;
 527 }
 528
 529 static struct uart_ops ks8695uart_pops = {
 530         .tx_empty       = ks8695uart_tx_empty,
 531         .set_mctrl      = ks8695uart_set_mctrl,
 532         .get_mctrl      = ks8695uart_get_mctrl,
 533         .stop_tx        = ks8695uart_stop_tx,
 534         .start_tx       = ks8695uart_start_tx,
 535         .stop_rx        = ks8695uart_stop_rx,
 536         .enable_ms      = ks8695uart_enable_ms,
 537         .break_ctl      = ks8695uart_break_ctl,
 538         .startup        = ks8695uart_startup,
 539         .shutdown       = ks8695uart_shutdown,
 540         .set_termios    = ks8695uart_set_termios,
 541         .type           = ks8695uart_type,
 542         .release_port   = ks8695uart_release_port,
 543         .request_port   = ks8695uart_request_port,
 544         .config_port    = ks8695uart_config_port,
 545         .verify_port    = ks8695uart_verify_port,
 546 };
 547
 548 static struct uart_port ks8695uart_ports[SERIAL_KS8695_NR] = {
 549         {
 550                 .membase        = KS8695_UART_VA,
 551                 .mapbase        = KS8695_UART_PA,
 552                 .iotype         = SERIAL_IO_MEM,
 553                 .irq            = KS8695_IRQ_UART_TX,
 554                 .uartclk        = KS8695_CLOCK_RATE * 16,
 555                 .fifosize       = 16,
 556                 .ops            = &ks8695uart_pops,
 557                 .flags          = ASYNC_BOOT_AUTOCONF,
 558                 .line           = 0,
 559         }
 560 };
 561
 562 #ifdef CONFIG_SERIAL_KS8695_CONSOLE
 563 static void ks8695_console_putchar(struct uart_port *port, int ch)
 564 {
 565         while (!(UART_GET_LSR(port) & URLS_URTHRE))
 566                 barrier();
 567
 568         UART_PUT_CHAR(port, ch);
 569 }
 570
 571 static void ks8695_console_write(struct console *co, const char *s, u_int count)
 572 {
 573         struct uart_port *port = ks8695uart_ports + co->index;
 574
 575         uart_console_write(port, s, count, ks8695_console_putchar);
 576 }
 577
 578 static void __init ks8695_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits)
 579 {
 580         unsigned int lcr;
 581
 582         lcr = UART_GET_LCR(port);
 583
 584         switch (lcr & URLC_PARITY) {
 585                 case URPE_ODD:
 586                         *parity = 'o';
 587                         break;
 588                 case URPE_EVEN:
 589                         *parity = 'e';
 590                         break;
 591                 default:
 592                         *parity = 'n';
 593         }
 594
 595         switch (lcr & URLC_URCL) {
 596                 case URCL_5:
 597                         *bits = 5;
 598                         break;
 599                 case URCL_6:
 600                         *bits = 6;
 601                         break;
 602                 case URCL_7:
 603                         *bits = 7;
 604                         break;
 605                 default:
 606                         *bits = 8;
 607         }
 608
 609         *baud = port->uartclk / (UART_GET_BRDR(port) & 0x0FFF);
 610         *baud /= 16;
 611         *baud &= 0xFFFFFFF0;
 612 }
 613
 614 static int __init ks8695_console_setup(struct console *co, char *options)
 615 {
 616         struct uart_port *port;
 617         int baud = 115200;
 618         int bits = 8;
 619         int parity = 'n';
 620         int flow = 'n';
 621
 622         /*
 623          * Check whether an invalid uart number has been specified, and
 624          * if so, search for the first available port that does have
 625          * console support.
 626          */
 627         port = uart_get_console(ks8695uart_ports, SERIAL_KS8695_NR, co);
 628
 629         if (options)
 630                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 631         else
 632                 ks8695_console_get_options(port, &baud, &parity, &bits);
 633
 634         return uart_set_options(port, co, baud, parity, bits, flow);
 635 }
 636
 637 static struct uart_driver ks8695_reg;
 638
 639 static struct console ks8695_console = {
 640         .name           = SERIAL_KS8695_DEVNAME,
 641         .write          = ks8695_console_write,
 642         .device         = uart_console_device,
 643         .setup          = ks8695_console_setup,
 644         .flags          = CON_PRINTBUFFER,
 645         .index          = -1,
 646         .data           = &ks8695_reg,
 647 };
 648
 649 static int __init ks8695_console_init(void)
 650 {
 651         add_preferred_console(SERIAL_KS8695_DEVNAME, 0, NULL);
 652         register_console(&ks8695_console);
 653         return 0;
 654 }
 655
 656 console_initcall(ks8695_console_init);
 657
 658 #define KS8695_CONSOLE  &ks8695_console
 659 #else
 660 #define KS8695_CONSOLE  NULL
 661 #endif
 662
 663 static struct uart_driver ks8695_reg = {
 664         .owner                  = THIS_MODULE,
 665         .driver_name            = "serial_ks8695",
 666         .dev_name               = SERIAL_KS8695_DEVNAME,
 667         .major                  = SERIAL_KS8695_MAJOR,
 668         .minor                  = SERIAL_KS8695_MINOR,
 669         .nr                     = SERIAL_KS8695_NR,
 670         .cons                   = KS8695_CONSOLE,
 671 };
 672
 673 static int __init ks8695uart_init(void)
 674 {
 675         int i, ret;
 676
 677         printk(KERN_INFO "Serial: Micrel KS8695 UART driver\n");
 678
 679         ret = uart_register_driver(&ks8695_reg);
 680         if (ret)
 681                 return ret;
 682
 683         for (i = 0; i < SERIAL_KS8695_NR; i++)
 684                 uart_add_one_port(&ks8695_reg, &ks8695uart_ports[0]);
 685
 686         return 0;
 687 }
 688
 689 static void __exit ks8695uart_exit(void)
 690 {
 691         int i;
 692
 693         for (i = 0; i < SERIAL_KS8695_NR; i++)
 694                 uart_remove_one_port(&ks8695_reg, &ks8695uart_ports[0]);
 695         uart_unregister_driver(&ks8695_reg);
 696 }
 697
 698 module_init(ks8695uart_init);
 699 module_exit(ks8695uart_exit);
 700
 701 MODULE_DESCRIPTION("KS8695 serial port driver");
 702 MODULE_AUTHOR("Micrel Inc.");
 703 MODULE_LICENSE("GPL");