Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 822 insertions, 0 deletions

diff --git a/drivers/serial/dz.c b/drivers/serial/dz.c
new file mode 100644
index 000000000000..97824eeeafae
--- /dev/null
+++ b/drivers/serial/dz.c
@@ -0,0 +1,822 @@
+/*
+ * dz.c: Serial port driver for DECStations equiped 
+ *       with the DZ chipset.
+ *
+ * Copyright (C) 1998 Olivier A. D. Lebaillif 
+ *             
+ * Email: olivier.lebaillif@ifrsys.com
+ *
+ * [31-AUG-98] triemer
+ * Changed IRQ to use Harald's dec internals interrupts.h
+ * removed base_addr code - moving address assignment to setup.c
+ * Changed name of dz_init to rs_init to be consistent with tc code
+ * [13-NOV-98] triemer fixed code to receive characters
+ *    after patches by harald to irq code.  
+ * [09-JAN-99] triemer minor fix for schedule - due to removal of timeout
+ *            field from "current" - somewhere between 2.1.121 and 2.1.131
+ Qua Jun 27 15:02:26 BRT 2001
+ * [27-JUN-2001] Arnaldo Carvalho de Melo <acme@conectiva.com.br> - cleanups
+ *  
+ * Parts (C) 1999 David Airlie, airlied@linux.ie 
+ * [07-SEP-99] Bugfixes 
+ *
+ * [06-Jan-2002] Russell King <rmk@arm.linux.org.uk>
+ * Converted to new serial core
+ */
+
+#undef DEBUG_DZ
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+
+#include <asm/bootinfo.h>
+#include <asm/dec/interrupts.h>
+#include <asm/dec/kn01.h>
+#include <asm/dec/kn02.h>
+#include <asm/dec/machtype.h>
+#include <asm/dec/prom.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#define CONSOLE_LINE (3)        /* for definition of struct console */
+
+#include "dz.h"
+
+#define DZ_INTR_DEBUG 1
+
+static char *dz_name = "DECstation DZ serial driver version ";
+static char *dz_version = "1.02";
+
+struct dz_port {
+        struct uart_port        port;
+        unsigned int            cflag;
+};
+
+static struct dz_port dz_ports[DZ_NB_PORT];
+
+#ifdef DEBUG_DZ
+/*
+ * debugging code to send out chars via prom 
+ */
+static void debug_console(const char *s, int count)
+{
+        unsigned i;
+
+        for (i = 0; i < count; i++) {
+                if (*s == 10)
+                        prom_printf("%c", 13);
+                prom_printf("%c", *s++);
+        }
+}
+#endif
+
+/*
+ * ------------------------------------------------------------
+ * dz_in () and dz_out ()
+ *
+ * These routines are used to access the registers of the DZ 
+ * chip, hiding relocation differences between implementation.
+ * ------------------------------------------------------------
+ */
+
+static inline unsigned short dz_in(struct dz_port *dport, unsigned offset)
+{
+        volatile unsigned short *addr =
+                (volatile unsigned short *) (dport->port.membase + offset);
+        return *addr;
+}
+
+static inline void dz_out(struct dz_port *dport, unsigned offset,
+                          unsigned short value)
+{
+        volatile unsigned short *addr =
+                (volatile unsigned short *) (dport->port.membase + offset);
+        *addr = value;
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop () and rs_start ()
+ *
+ * These routines are called before setting or resetting 
+ * tty->stopped. They enable or disable transmitter interrupts, 
+ * as necessary.
+ * ------------------------------------------------------------
+ */
+
+static void dz_stop_tx(struct uart_port *uport, unsigned int tty_stop)
+{
+        struct dz_port *dport = (struct dz_port *)uport;
+        unsigned short tmp, mask = 1 << dport->port.line;
+        unsigned long flags;
+
+        spin_lock_irqsave(&dport->port.lock, flags);
+        tmp = dz_in(dport, DZ_TCR);     /* read the TX flag */
+        tmp &= ~mask;                   /* clear the TX flag */
+        dz_out(dport, DZ_TCR, tmp);
+        spin_unlock_irqrestore(&dport->port.lock, flags);
+}
+
+static void dz_start_tx(struct uart_port *uport, unsigned int tty_start)
+{
+        struct dz_port *dport = (struct dz_port *)uport;
+        unsigned short tmp, mask = 1 << dport->port.line;
+        unsigned long flags;
+
+        spin_lock_irqsave(&dport->port.lock, flags);
+        tmp = dz_in(dport, DZ_TCR);     /* read the TX flag */
+        tmp |= mask;                    /* set the TX flag */
+        dz_out(dport, DZ_TCR, tmp);
+        spin_unlock_irqrestore(&dport->port.lock, flags);
+}
+
+static void dz_stop_rx(struct uart_port *uport)
+{
+        struct dz_port *dport = (struct dz_port *)uport;
+        unsigned long flags;
+
+        spin_lock_irqsave(&dport->port.lock, flags);
+        dport->cflag &= ~DZ_CREAD;
+        dz_out(dport, DZ_LPR, dport->cflag);
+        spin_unlock_irqrestore(&dport->port.lock, flags);
+}
+
+static void dz_enable_ms(struct uart_port *port)
+{
+        /* nothing to do */
+}
+
+/*
+ * ------------------------------------------------------------
+ * Here starts the interrupt handling routines.  All of the 
+ * following subroutines are declared as inline and are folded 
+ * into dz_interrupt.  They were separated out for readability's 
+ * sake. 
+ *
+ * Note: rs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off.  People who may want to modify
+ * rs_interrupt() should try to keep the interrupt handler as fast as
+ * possible.  After you are done making modifications, it is not a bad
+ * idea to do:
+ * 
+ *      make drivers/serial/dz.s
+ *
+ * and look at the resulting assemble code in dz.s.
+ *
+ * ------------------------------------------------------------
+ */
+
+/*
+ * ------------------------------------------------------------
+ * receive_char ()
+ *
+ * This routine deals with inputs from any lines.
+ * ------------------------------------------------------------
+ */
+static inline void dz_receive_chars(struct dz_port *dport)
+{
+        struct tty_struct *tty = NULL;
+        struct uart_icount *icount;
+        int ignore = 0;
+        unsigned short status, tmp;
+        unsigned char ch, flag;
+
+        /* this code is going to be a problem...
+           the call to tty_flip_buffer is going to need
+           to be rethought...
+         */
+        do {
+                status = dz_in(dport, DZ_RBUF);
+
+                /* punt so we don't get duplicate characters */
+                if (!(status & DZ_DVAL))
+                        goto ignore_char;
+
+
+                ch = UCHAR(status);     /* grab the char */
+                flag = TTY_NORMAL;
+
+#if 0
+                if (info->is_console) {
+                        if (ch == 0)
+                                return;         /* it's a break ... */
+                }
+#endif
+
+                tty = dport->port.info->tty;/* now tty points to the proper dev */
+                icount = &dport->port.icount;
+
+                if (!tty)
+                        break;
+                if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+                        break;
+
+                icount->rx++;
+
+                /* keep track of the statistics */
+                if (status & (DZ_OERR | DZ_FERR | DZ_PERR)) {
+                        if (status & DZ_PERR)   /* parity error */
+                                icount->parity++;
+                        else if (status & DZ_FERR)      /* frame error */
+                                icount->frame++;
+                        if (status & DZ_OERR)   /* overrun error */
+                                icount->overrun++;
+
+                        /*  check to see if we should ignore the character
+                           and mask off conditions that should be ignored
+                         */
+
+                        if (status & dport->port.ignore_status_mask) {
+                                if (++ignore > 100)
+                                        break;
+                                goto ignore_char;
+                        }
+                        /* mask off the error conditions we want to ignore */
+                        tmp = status & dport->port.read_status_mask;
+
+                        if (tmp & DZ_PERR) {
+                                flag = TTY_PARITY;
+#ifdef DEBUG_DZ
+                                debug_console("PERR\n", 5);
+#endif
+                        } else if (tmp & DZ_FERR) {
+                                flag = TTY_FRAME;
+#ifdef DEBUG_DZ
+                                debug_console("FERR\n", 5);
+#endif
+                        }
+                        if (tmp & DZ_OERR) {
+#ifdef DEBUG_DZ
+                                debug_console("OERR\n", 5);
+#endif
+                                tty_insert_flip_char(tty, ch, flag);
+                                ch = 0;
+                                flag = TTY_OVERRUN;
+                        }
+                }
+                tty_insert_flip_char(tty, ch, flag);
+              ignore_char:
+        } while (status & DZ_DVAL);
+
+        if (tty)
+                tty_flip_buffer_push(tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * transmit_char ()
+ *
+ * This routine deals with outputs to any lines.
+ * ------------------------------------------------------------
+ */
+static inline void dz_transmit_chars(struct dz_port *dport)
+{
+        struct circ_buf *xmit = &dport->port.info->xmit;
+        unsigned char tmp;
+
+        if (dport->port.x_char) {       /* XON/XOFF chars */
+                dz_out(dport, DZ_TDR, dport->port.x_char);
+                dport->port.icount.tx++;
+                dport->port.x_char = 0;
+                return;
+        }
+        /* if nothing to do or stopped or hardware stopped */
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) {
+                dz_stop_tx(&dport->port, 0);
+                return;
+        }
+
+        /*
+         * if something to do ... (rember the dz has no output fifo so we go
+         * one char at a time :-<
+         */
+        tmp = xmit->buf[xmit->tail];
+        xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1);
+        dz_out(dport, DZ_TDR, tmp);
+        dport->port.icount.tx++;
+
+        if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS)
+                uart_write_wakeup(&dport->port);
+
+        /* Are we done */
+        if (uart_circ_empty(xmit))
+                dz_stop_tx(&dport->port, 0);
+}
+
+/*
+ * ------------------------------------------------------------
+ * check_modem_status ()
+ *
+ * Only valid for the MODEM line duh !
+ * ------------------------------------------------------------
+ */
+static inline void check_modem_status(struct dz_port *dport)
+{
+        unsigned short status;
+
+        /* if not ne modem line just return */
+        if (dport->port.line != DZ_MODEM)
+                return;
+
+        status = dz_in(dport, DZ_MSR);
+
+        /* it's easy, since DSR2 is the only bit in the register */
+        if (status)
+                dport->port.icount.dsr++;
+}
+
+/*
+ * ------------------------------------------------------------
+ * dz_interrupt ()
+ *
+ * this is the main interrupt routine for the DZ chip.
+ * It deals with the multiple ports.
+ * ------------------------------------------------------------
+ */
+static irqreturn_t dz_interrupt(int irq, void *dev, struct pt_regs *regs)
+{
+        struct dz_port *dport;
+        unsigned short status;
+
+        /* get the reason why we just got an irq */
+        status = dz_in((struct dz_port *)dev, DZ_CSR);
+        dport = &dz_ports[LINE(status)];
+
+        if (status & DZ_RDONE)
+                dz_receive_chars(dport);
+
+        if (status & DZ_TRDY)
+                dz_transmit_chars(dport);
+
+        /* FIXME: what about check modem status??? --rmk */
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the DZ interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+static unsigned int dz_get_mctrl(struct uart_port *uport)
+{
+        struct dz_port *dport = (struct dz_port *)uport;
+        unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+
+        if (dport->port.line == DZ_MODEM) {
+                /*
+                 * CHECKME: This is a guess from the other code... --rmk
+                 */
+                if (dz_in(dport, DZ_MSR) & DZ_MODEM_DSR)
+                        mctrl &= ~TIOCM_DSR;
+        }
+
+        return mctrl;
+}
+
+static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl)
+{
+        struct dz_port *dport = (struct dz_port *)uport;
+        unsigned short tmp;
+
+        if (dport->port.line == DZ_MODEM) {
+                tmp = dz_in(dport, DZ_TCR);
+                if (mctrl & TIOCM_DTR)
+                        tmp &= ~DZ_MODEM_DTR;
+                else
+                        tmp |= DZ_MODEM_DTR;
+                dz_out(dport, DZ_TCR, tmp);
+        }
+}
+
+/*
+ * -------------------------------------------------------------------
+ * startup ()
+ *
+ * various initialization tasks
+ * ------------------------------------------------------------------- 
+ */
+static int dz_startup(struct uart_port *uport)
+{
+        struct dz_port *dport = (struct dz_port *)uport;
+        unsigned long flags;
+        unsigned short tmp;
+
+        /* The dz lines for the mouse/keyboard must be
+         * opened using their respective drivers.
+         */
+        if ((dport->port.line == DZ_KEYBOARD) ||
+            (dport->port.line == DZ_MOUSE))
+                return -ENODEV;
+
+        spin_lock_irqsave(&dport->port.lock, flags);
+
+        /* enable the interrupt and the scanning */
+        tmp = dz_in(dport, DZ_CSR);
+        tmp |= DZ_RIE | DZ_TIE | DZ_MSE;
+        dz_out(dport, DZ_CSR, tmp);
+
+        spin_unlock_irqrestore(&dport->port.lock, flags);
+
+        return 0;
+}
+
+/* 
+ * -------------------------------------------------------------------
+ * shutdown ()
+ *
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ * ------------------------------------------------------------------- 
+ */
+static void dz_shutdown(struct uart_port *uport)
+{
+        dz_stop_tx(uport, 0);
+}
+
+/*
+ * get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ *          is emptied.  On bus types like RS485, the transmitter must
+ *          release the bus after transmitting. This must be done when
+ *          the transmit shift register is empty, not be done when the
+ *          transmit holding register is empty.  This functionality
+ *          allows an RS485 driver to be written in user space. 
+ */
+static unsigned int dz_tx_empty(struct uart_port *uport)
+{
+        struct dz_port *dport = (struct dz_port *)uport;
+        unsigned short status = dz_in(dport, DZ_LPR);
+
+        /* FIXME: this appears to be obviously broken --rmk. */
+        return status ? TIOCSER_TEMT : 0;
+}
+
+static void dz_break_ctl(struct uart_port *uport, int break_state)
+{
+        struct dz_port *dport = (struct dz_port *)uport;
+        unsigned long flags;
+        unsigned short tmp, mask = 1 << uport->line;
+
+        spin_lock_irqsave(&uport->lock, flags);
+        tmp = dz_in(dport, DZ_TCR);
+        if (break_state)
+                tmp |= mask;
+        else
+                tmp &= ~mask;
+        dz_out(dport, DZ_TCR, tmp);
+        spin_unlock_irqrestore(&uport->lock, flags);
+}
+
+static void dz_set_termios(struct uart_port *uport, struct termios *termios,
+                           struct termios *old_termios)
+{
+        struct dz_port *dport = (struct dz_port *)uport;
+        unsigned long flags;
+        unsigned int cflag, baud;
+
+        cflag = dport->port.line;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                cflag |= DZ_CS5;
+                break;
+        case CS6:
+                cflag |= DZ_CS6;
+                break;
+        case CS7:
+                cflag |= DZ_CS7;
+                break;
+        case CS8:
+        default:
+                cflag |= DZ_CS8;
+        }
+
+        if (termios->c_cflag & CSTOPB)
+                cflag |= DZ_CSTOPB;
+        if (termios->c_cflag & PARENB)
+                cflag |= DZ_PARENB;
+        if (termios->c_cflag & PARODD)
+                cflag |= DZ_PARODD;
+
+        baud = uart_get_baud_rate(uport, termios, old_termios, 50, 9600);
+        switch (baud) {
+        case 50:
+                cflag |= DZ_B50;
+                break;
+        case 75:
+                cflag |= DZ_B75;
+                break;
+        case 110:
+                cflag |= DZ_B110;
+                break;
+        case 134:
+                cflag |= DZ_B134;
+                break;
+        case 150:
+                cflag |= DZ_B150;
+                break;
+        case 300:
+                cflag |= DZ_B300;
+                break;
+        case 600:
+                cflag |= DZ_B600;
+                break;
+        case 1200:
+                cflag |= DZ_B1200;
+                break;
+        case 1800:
+                cflag |= DZ_B1800;
+                break;
+        case 2000:
+                cflag |= DZ_B2000;
+                break;
+        case 2400:
+                cflag |= DZ_B2400;
+                break;
+        case 3600:
+                cflag |= DZ_B3600;
+                break;
+        case 4800:
+                cflag |= DZ_B4800;
+                break;
+        case 7200:
+                cflag |= DZ_B7200;
+                break;
+        case 9600:
+        default:
+                cflag |= DZ_B9600;
+        }
+
+        if (termios->c_cflag & CREAD)
+                cflag |= DZ_RXENAB;
+
+        spin_lock_irqsave(&dport->port.lock, flags);
+
+        dz_out(dport, DZ_LPR, cflag);
+        dport->cflag = cflag;
+
+        /* setup accept flag */
+        dport->port.read_status_mask = DZ_OERR;
+        if (termios->c_iflag & INPCK)
+                dport->port.read_status_mask |= DZ_FERR | DZ_PERR;
+
+        /* characters to ignore */
+        uport->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                dport->port.ignore_status_mask |= DZ_FERR | DZ_PERR;
+
+        spin_unlock_irqrestore(&dport->port.lock, flags);
+}
+
+static const char *dz_type(struct uart_port *port)
+{
+        return "DZ";
+}
+
+static void dz_release_port(struct uart_port *port)
+{
+        /* nothing to do */
+}
+
+static int dz_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static void dz_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE)
+                port->type = PORT_DZ;
+}
+
+/*
+ * verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int dz_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        int ret = 0;
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ)
+                ret = -EINVAL;
+        if (ser->irq != port->irq)
+                ret = -EINVAL;
+        return ret;
+}
+
+static struct uart_ops dz_ops = {
+        .tx_empty       = dz_tx_empty,
+        .get_mctrl      = dz_get_mctrl,
+        .set_mctrl      = dz_set_mctrl,
+        .stop_tx        = dz_stop_tx,
+        .start_tx       = dz_start_tx,
+        .stop_rx        = dz_stop_rx,
+        .enable_ms      = dz_enable_ms,
+        .break_ctl      = dz_break_ctl,
+        .startup        = dz_startup,
+        .shutdown       = dz_shutdown,
+        .set_termios    = dz_set_termios,
+        .type           = dz_type,
+        .release_port   = dz_release_port,
+        .request_port   = dz_request_port,
+        .config_port    = dz_config_port,
+        .verify_port    = dz_verify_port,
+};
+
+static void __init dz_init_ports(void)
+{
+        static int first = 1;
+        struct dz_port *dport;
+        unsigned long base;
+        int i;
+
+        if (!first)
+                return;
+        first = 0;
+
+        if (mips_machtype == MACH_DS23100 ||
+            mips_machtype == MACH_DS5100)
+                base = (unsigned long) KN01_DZ11_BASE;
+        else
+                base = (unsigned long) KN02_DZ11_BASE;
+
+        for (i = 0, dport = dz_ports; i < DZ_NB_PORT; i++, dport++) {
+                spin_lock_init(&dport->port.lock);
+                dport->port.membase     = (char *) base;
+                dport->port.iotype      = SERIAL_IO_PORT;
+                dport->port.irq         = dec_interrupt[DEC_IRQ_DZ11];
+                dport->port.line        = i;
+                dport->port.fifosize    = 1;
+                dport->port.ops         = &dz_ops;
+                dport->port.flags       = UPF_BOOT_AUTOCONF;
+        }
+}
+
+static void dz_reset(struct dz_port *dport)
+{
+        dz_out(dport, DZ_CSR, DZ_CLR);
+
+        while (dz_in(dport, DZ_CSR) & DZ_CLR);
+                /* FIXME: cpu_relax? */
+
+        iob();
+
+        /* enable scanning */
+        dz_out(dport, DZ_CSR, DZ_MSE);
+}
+
+#ifdef CONFIG_SERIAL_DZ_CONSOLE
+static void dz_console_put_char(struct dz_port *dport, unsigned char ch)
+{
+        unsigned long flags;
+        int loops = 2500;
+        unsigned short tmp = ch;
+        /* this code sends stuff out to serial device - spinning its
+           wheels and waiting. */
+
+        spin_lock_irqsave(&dport->port.lock, flags);
+
+        /* spin our wheels */
+        while (((dz_in(dport, DZ_CSR) & DZ_TRDY) != DZ_TRDY) && loops--)
+                /* FIXME: cpu_relax, udelay? --rmk */
+                ;
+
+        /* Actually transmit the character. */
+        dz_out(dport, DZ_TDR, tmp);
+
+        spin_unlock_irqrestore(&dport->port.lock, flags);
+}
+/* 
+ * -------------------------------------------------------------------
+ * dz_console_print ()
+ *
+ * dz_console_print is registered for printk.
+ * The console must be locked when we get here.
+ * ------------------------------------------------------------------- 
+ */
+static void dz_console_print(struct console *cons,
+                             const char *str,
+                             unsigned int count)
+{
+        struct dz_port *dport = &dz_ports[CONSOLE_LINE];
+#ifdef DEBUG_DZ
+        prom_printf((char *) str);
+#endif
+        while (count--) {
+                if (*str == '\n')
+                        dz_console_put_char(dport, '\r');
+                dz_console_put_char(dport, *str++);
+        }
+}
+
+static int __init dz_console_setup(struct console *co, char *options)
+{
+        struct dz_port *dport = &dz_ports[CONSOLE_LINE];
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+        int ret;
+        unsigned short mask, tmp;
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        dz_reset(dport);
+
+        ret = uart_set_options(&dport->port, co, baud, parity, bits, flow);
+        if (ret == 0) {
+                mask = 1 << dport->port.line;
+                tmp = dz_in(dport, DZ_TCR);     /* read the TX flag */
+                if (!(tmp & mask)) {
+                        tmp |= mask;            /* set the TX flag */
+                        dz_out(dport, DZ_TCR, tmp);
+                }
+        }
+
+        return ret;
+}
+
+static struct console dz_sercons =
+{
+        .name   = "ttyS",
+        .write  = dz_console_print,
+        .device = uart_console_device,
+        .setup  = dz_console_setup,
+        .flags  = CON_CONSDEV | CON_PRINTBUFFER,
+        .index  = CONSOLE_LINE,
+};
+
+void __init dz_serial_console_init(void)
+{
+        dz_init_ports();
+
+        register_console(&dz_sercons);
+}
+
+#define SERIAL_DZ_CONSOLE       &dz_sercons
+#else
+#define SERIAL_DZ_CONSOLE       NULL
+#endif /* CONFIG_SERIAL_DZ_CONSOLE */
+
+static struct uart_driver dz_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "serial",
+#ifdef CONFIG_DEVFS
+        .dev_name               = "tts/%d",
+#else
+        .dev_name               = "ttyS%d",
+#endif
+        .major                  = TTY_MAJOR,
+        .minor                  = 64,
+        .nr                     = DZ_NB_PORT,
+        .cons                   = SERIAL_DZ_CONSOLE,
+};
+
+int __init dz_init(void)
+{
+        unsigned long flags;
+        int ret, i;
+
+        printk("%s%s\n", dz_name, dz_version);
+
+        dz_init_ports();
+
+        save_flags(flags);
+        cli();
+
+#ifndef CONFIG_SERIAL_DZ_CONSOLE
+        /* reset the chip */
+        dz_reset(&dz_ports[0]);
+#endif
+
+        /* order matters here... the trick is that flags
+           is updated... in request_irq - to immediatedly obliterate
+           it is unwise. */
+        restore_flags(flags);
+
+        if (request_irq(dz_ports[0].port.irq, dz_interrupt,
+                        SA_INTERRUPT, "DZ", &dz_ports[0]))
+                panic("Unable to register DZ interrupt");
+
+        ret = uart_register_driver(&dz_reg);
+        if (ret != 0)
+                return ret;
+
+        for (i = 0; i < DZ_NB_PORT; i++)
+                uart_add_one_port(&dz_reg, &dz_ports[i].port);
+
+        return ret;
+}
+
+MODULE_DESCRIPTION("DECstation DZ serial driver");
+MODULE_LICENSE("GPL");