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, 1809 insertions, 0 deletions

diff --git a/drivers/char/riscom8.c b/drivers/char/riscom8.c
new file mode 100644
index 000000000000..55a3a0188eda
--- /dev/null
+++ b/drivers/char/riscom8.c
@@ -0,0 +1,1809 @@
+/*
+ *      linux/drivers/char/riscom.c  -- RISCom/8 multiport serial driver.
+ *
+ *      Copyright (C) 1994-1996  Dmitry Gorodchanin (pgmdsg@ibi.com)
+ *
+ *      This code is loosely based on the Linux serial driver, written by
+ *      Linus Torvalds, Theodore T'so and others. The RISCom/8 card 
+ *      programming info was obtained from various drivers for other OSes 
+ *	(FreeBSD, ISC, etc), but no source code from those drivers were 
+ *	directly included in this driver.
+ *
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ *      This program is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU General Public License for more details.
+ *
+ *      You should have received a copy of the GNU General Public License
+ *      along with this program; if not, write to the Free Software
+ *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *	Revision 1.1
+ *
+ *	ChangeLog:
+ *	Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 27-Jun-2001
+ *	- get rid of check_region and several cleanups
+ */
+
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/mm.h>
+#include <linux/serial.h>
+#include <linux/fcntl.h>
+#include <linux/major.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+
+#include <asm/uaccess.h>
+
+#include "riscom8.h"
+#include "riscom8_reg.h"
+
+/* Am I paranoid or not ? ;-) */
+#define RISCOM_PARANOIA_CHECK
+
+/* 
+ * Crazy InteliCom/8 boards sometimes has swapped CTS & DSR signals.
+ * You can slightly speed up things by #undefing the following option,
+ * if you are REALLY sure that your board is correct one. 
+ */
+
+#define RISCOM_BRAIN_DAMAGED_CTS
+
+/* 
+ * The following defines are mostly for testing purposes. But if you need
+ * some nice reporting in your syslog, you can define them also.
+ */
+#undef RC_REPORT_FIFO
+#undef RC_REPORT_OVERRUN
+
+
+#define RISCOM_LEGAL_FLAGS \
+	(ASYNC_HUP_NOTIFY   | ASYNC_SAK          | ASYNC_SPLIT_TERMIOS   | \
+	 ASYNC_SPD_HI       | ASYNC_SPEED_VHI    | ASYNC_SESSION_LOCKOUT | \
+	 ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP)
+
+#define RS_EVENT_WRITE_WAKEUP	0
+
+static struct riscom_board * IRQ_to_board[16];
+static struct tty_driver *riscom_driver;
+static unsigned char * tmp_buf;
+static DECLARE_MUTEX(tmp_buf_sem);
+
+static unsigned long baud_table[] =  {
+	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+	9600, 19200, 38400, 57600, 76800, 0, 
+};
+
+static struct riscom_board rc_board[RC_NBOARD] =  {
+	{
+		.base	= RC_IOBASE1,
+	},
+	{
+		.base	= RC_IOBASE2,
+	},
+	{
+		.base	= RC_IOBASE3,
+	},
+	{
+		.base	= RC_IOBASE4,
+	},
+};
+
+static struct riscom_port rc_port[RC_NBOARD * RC_NPORT];
+
+/* RISCom/8 I/O ports addresses (without address translation) */
+static unsigned short rc_ioport[] =  {
+#if 1	
+	0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c,
+#else	
+	0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c, 0x10,
+	0x11, 0x12, 0x18, 0x28, 0x31, 0x32, 0x39, 0x3a, 0x40, 0x41, 0x61, 0x62,
+	0x63, 0x64, 0x6b, 0x70, 0x71, 0x78, 0x7a, 0x7b, 0x7f, 0x100, 0x101
+#endif	
+};
+#define RC_NIOPORT	(sizeof(rc_ioport) / sizeof(rc_ioport[0]))
+
+
+static inline int rc_paranoia_check(struct riscom_port const * port,
+				    char *name, const char *routine)
+{
+#ifdef RISCOM_PARANOIA_CHECK
+	static const char badmagic[] = KERN_INFO
+		"rc: Warning: bad riscom port magic number for device %s in %s\n";
+	static const char badinfo[] = KERN_INFO
+		"rc: Warning: null riscom port for device %s in %s\n";
+
+	if (!port) {
+		printk(badinfo, name, routine);
+		return 1;
+	}
+	if (port->magic != RISCOM8_MAGIC) {
+		printk(badmagic, name, routine);
+		return 1;
+	}
+#endif
+	return 0;
+}
+
+/*
+ * 
+ *  Service functions for RISCom/8 driver.
+ * 
+ */
+
+/* Get board number from pointer */
+static inline int board_No (struct riscom_board const * bp)
+{
+	return bp - rc_board;
+}
+
+/* Get port number from pointer */
+static inline int port_No (struct riscom_port const * port)
+{
+	return RC_PORT(port - rc_port); 
+}
+
+/* Get pointer to board from pointer to port */
+static inline struct riscom_board * port_Board(struct riscom_port const * port)
+{
+	return &rc_board[RC_BOARD(port - rc_port)];
+}
+
+/* Input Byte from CL CD180 register */
+static inline unsigned char rc_in(struct riscom_board const * bp, unsigned short reg)
+{
+	return inb(bp->base + RC_TO_ISA(reg));
+}
+
+/* Output Byte to CL CD180 register */
+static inline void rc_out(struct riscom_board const * bp, unsigned short reg,
+			  unsigned char val)
+{
+	outb(val, bp->base + RC_TO_ISA(reg));
+}
+
+/* Wait for Channel Command Register ready */
+static inline void rc_wait_CCR(struct riscom_board const * bp)
+{
+	unsigned long delay;
+
+	/* FIXME: need something more descriptive then 100000 :) */
+	for (delay = 100000; delay; delay--) 
+		if (!rc_in(bp, CD180_CCR))
+			return;
+	
+	printk(KERN_INFO "rc%d: Timeout waiting for CCR.\n", board_No(bp));
+}
+
+/*
+ *  RISCom/8 probe functions.
+ */
+
+static inline int rc_request_io_range(struct riscom_board * const bp)
+{
+	int i;
+	
+	for (i = 0; i < RC_NIOPORT; i++)  
+		if (!request_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1,
+				   "RISCom/8"))  {
+			goto out_release;
+		}
+	return 0;
+out_release:
+	printk(KERN_INFO "rc%d: Skipping probe at 0x%03x. IO address in use.\n",
+			 board_No(bp), bp->base);
+	while(--i >= 0)
+		release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
+	return 1;
+}
+
+static inline void rc_release_io_range(struct riscom_board * const bp)
+{
+	int i;
+	
+	for (i = 0; i < RC_NIOPORT; i++)  
+		release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
+}
+	
+/* Must be called with enabled interrupts */
+static inline void rc_long_delay(unsigned long delay)
+{
+	unsigned long i;
+	
+	for (i = jiffies + delay; time_after(i,jiffies); ) ;
+}
+
+/* Reset and setup CD180 chip */
+static void __init rc_init_CD180(struct riscom_board const * bp)
+{
+	unsigned long flags;
+	
+	save_flags(flags); cli();
+	rc_out(bp, RC_CTOUT, 0);     	           /* Clear timeout             */
+	rc_wait_CCR(bp);			   /* Wait for CCR ready        */
+	rc_out(bp, CD180_CCR, CCR_HARDRESET);      /* Reset CD180 chip          */
+	sti();
+	rc_long_delay(HZ/20);                      /* Delay 0.05 sec            */
+	cli();
+	rc_out(bp, CD180_GIVR, RC_ID);             /* Set ID for this chip      */
+	rc_out(bp, CD180_GICR, 0);                 /* Clear all bits            */
+	rc_out(bp, CD180_PILR1, RC_ACK_MINT);      /* Prio for modem intr       */
+	rc_out(bp, CD180_PILR2, RC_ACK_TINT);      /* Prio for transmitter intr */
+	rc_out(bp, CD180_PILR3, RC_ACK_RINT);      /* Prio for receiver intr    */
+	
+	/* Setting up prescaler. We need 4 ticks per 1 ms */
+	rc_out(bp, CD180_PPRH, (RC_OSCFREQ/(1000000/RISCOM_TPS)) >> 8);
+	rc_out(bp, CD180_PPRL, (RC_OSCFREQ/(1000000/RISCOM_TPS)) & 0xff);
+	
+	restore_flags(flags);
+}
+
+/* Main probing routine, also sets irq. */
+static int __init rc_probe(struct riscom_board *bp)
+{
+	unsigned char val1, val2;
+	int irqs = 0;
+	int retries;
+	
+	bp->irq = 0;
+
+	if (rc_request_io_range(bp))
+		return 1;
+	
+	/* Are the I/O ports here ? */
+	rc_out(bp, CD180_PPRL, 0x5a);
+	outb(0xff, 0x80);
+	val1 = rc_in(bp, CD180_PPRL);
+	rc_out(bp, CD180_PPRL, 0xa5);
+	outb(0x00, 0x80);
+	val2 = rc_in(bp, CD180_PPRL);
+	
+	if ((val1 != 0x5a) || (val2 != 0xa5))  {
+		printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not found.\n",
+		       board_No(bp), bp->base);
+		goto out_release;
+	}
+	
+	/* It's time to find IRQ for this board */
+	for (retries = 0; retries < 5 && irqs <= 0; retries++)  {
+		irqs = probe_irq_on();
+		rc_init_CD180(bp);	       		/* Reset CD180 chip       */
+		rc_out(bp, CD180_CAR, 2);               /* Select port 2          */
+		rc_wait_CCR(bp);
+		rc_out(bp, CD180_CCR, CCR_TXEN);        /* Enable transmitter     */
+		rc_out(bp, CD180_IER, IER_TXRDY);       /* Enable tx empty intr   */
+		rc_long_delay(HZ/20);	       		
+		irqs = probe_irq_off(irqs);
+		val1 = rc_in(bp, RC_BSR);		/* Get Board Status reg   */
+		val2 = rc_in(bp, RC_ACK_TINT);          /* ACK interrupt          */
+		rc_init_CD180(bp);	       		/* Reset CD180 again      */
+	
+		if ((val1 & RC_BSR_TINT) || (val2 != (RC_ID | GIVR_IT_TX)))  {
+			printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not "
+					"found.\n", board_No(bp), bp->base);
+			goto out_release;
+		}
+	}
+	
+	if (irqs <= 0)  {
+		printk(KERN_ERR "rc%d: Can't find IRQ for RISCom/8 board "
+				"at 0x%03x.\n", board_No(bp), bp->base);
+		goto out_release;
+	}
+	bp->irq = irqs;
+	bp->flags |= RC_BOARD_PRESENT;
+	
+	printk(KERN_INFO "rc%d: RISCom/8 Rev. %c board detected at "
+			 "0x%03x, IRQ %d.\n",
+	       board_No(bp),
+	       (rc_in(bp, CD180_GFRCR) & 0x0f) + 'A',   /* Board revision */
+	       bp->base, bp->irq);
+	
+	return 0;
+out_release:
+	rc_release_io_range(bp);
+	return 1;
+}
+
+/* 
+ * 
+ *  Interrupt processing routines.
+ * 
+ */
+
+static inline void rc_mark_event(struct riscom_port * port, int event)
+{
+	set_bit(event, &port->event);
+	schedule_work(&port->tqueue);
+}
+
+static inline struct riscom_port * rc_get_port(struct riscom_board const * bp,
+					       unsigned char const * what)
+{
+	unsigned char channel;
+	struct riscom_port * port;
+	
+	channel = rc_in(bp, CD180_GICR) >> GICR_CHAN_OFF;
+	if (channel < CD180_NCH)  {
+		port = &rc_port[board_No(bp) * RC_NPORT + channel];
+		if (port->flags & ASYNC_INITIALIZED)  {
+			return port;
+		}
+	}
+	printk(KERN_ERR "rc%d: %s interrupt from invalid port %d\n", 
+	       board_No(bp), what, channel);
+	return NULL;
+}
+
+static inline void rc_receive_exc(struct riscom_board const * bp)
+{
+	struct riscom_port *port;
+	struct tty_struct *tty;
+	unsigned char status;
+	unsigned char ch;
+	
+	if (!(port = rc_get_port(bp, "Receive")))
+		return;
+
+	tty = port->tty;
+	if (tty->flip.count >= TTY_FLIPBUF_SIZE)  {
+		printk(KERN_WARNING "rc%d: port %d: Working around flip "
+				    "buffer overflow.\n",
+		       board_No(bp), port_No(port));
+		return;
+	}
+	
+#ifdef RC_REPORT_OVERRUN	
+	status = rc_in(bp, CD180_RCSR);
+	if (status & RCSR_OE)  {
+		port->overrun++;
+#if 0		
+		printk(KERN_ERR "rc%d: port %d: Overrun. Total %ld overruns\n", 
+		       board_No(bp), port_No(port), port->overrun);
+#endif		
+	}
+	status &= port->mark_mask;
+#else	
+	status = rc_in(bp, CD180_RCSR) & port->mark_mask;
+#endif	
+	ch = rc_in(bp, CD180_RDR);
+	if (!status)  {
+		return;
+	}
+	if (status & RCSR_TOUT)  {
+		printk(KERN_WARNING "rc%d: port %d: Receiver timeout. "
+				    "Hardware problems ?\n", 
+		       board_No(bp), port_No(port));
+		return;
+		
+	} else if (status & RCSR_BREAK)  {
+		printk(KERN_INFO "rc%d: port %d: Handling break...\n",
+		       board_No(bp), port_No(port));
+		*tty->flip.flag_buf_ptr++ = TTY_BREAK;
+		if (port->flags & ASYNC_SAK)
+			do_SAK(tty);
+		
+	} else if (status & RCSR_PE) 
+		*tty->flip.flag_buf_ptr++ = TTY_PARITY;
+	
+	else if (status & RCSR_FE) 
+		*tty->flip.flag_buf_ptr++ = TTY_FRAME;
+	
+        else if (status & RCSR_OE)
+		*tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
+	
+	else
+		*tty->flip.flag_buf_ptr++ = 0;
+	
+	*tty->flip.char_buf_ptr++ = ch;
+	tty->flip.count++;
+	schedule_delayed_work(&tty->flip.work, 1);
+}
+
+static inline void rc_receive(struct riscom_board const * bp)
+{
+	struct riscom_port *port;
+	struct tty_struct *tty;
+	unsigned char count;
+	
+	if (!(port = rc_get_port(bp, "Receive")))
+		return;
+	
+	tty = port->tty;
+	
+	count = rc_in(bp, CD180_RDCR);
+	
+#ifdef RC_REPORT_FIFO
+	port->hits[count > 8 ? 9 : count]++;
+#endif	
+	
+	while (count--)  {
+		if (tty->flip.count >= TTY_FLIPBUF_SIZE)  {
+			printk(KERN_WARNING "rc%d: port %d: Working around "
+					    "flip buffer overflow.\n",
+			       board_No(bp), port_No(port));
+			break;
+		}
+		*tty->flip.char_buf_ptr++ = rc_in(bp, CD180_RDR);
+		*tty->flip.flag_buf_ptr++ = 0;
+		tty->flip.count++;
+	}
+	schedule_delayed_work(&tty->flip.work, 1);
+}
+
+static inline void rc_transmit(struct riscom_board const * bp)
+{
+	struct riscom_port *port;
+	struct tty_struct *tty;
+	unsigned char count;
+	
+	
+	if (!(port = rc_get_port(bp, "Transmit")))
+		return;
+	
+	tty = port->tty;
+	
+	if (port->IER & IER_TXEMPTY)  {
+		/* FIFO drained */
+		rc_out(bp, CD180_CAR, port_No(port));
+		port->IER &= ~IER_TXEMPTY;
+		rc_out(bp, CD180_IER, port->IER);
+		return;
+	}
+	
+	if ((port->xmit_cnt <= 0 && !port->break_length)
+	    || tty->stopped || tty->hw_stopped)  {
+		rc_out(bp, CD180_CAR, port_No(port));
+		port->IER &= ~IER_TXRDY;
+		rc_out(bp, CD180_IER, port->IER);
+		return;
+	}
+	
+	if (port->break_length)  {
+		if (port->break_length > 0)  {
+			if (port->COR2 & COR2_ETC)  {
+				rc_out(bp, CD180_TDR, CD180_C_ESC);
+				rc_out(bp, CD180_TDR, CD180_C_SBRK);
+				port->COR2 &= ~COR2_ETC;
+			}
+			count = min_t(int, port->break_length, 0xff);
+			rc_out(bp, CD180_TDR, CD180_C_ESC);
+			rc_out(bp, CD180_TDR, CD180_C_DELAY);
+			rc_out(bp, CD180_TDR, count);
+			if (!(port->break_length -= count))
+				port->break_length--;
+		} else  {
+			rc_out(bp, CD180_TDR, CD180_C_ESC);
+			rc_out(bp, CD180_TDR, CD180_C_EBRK);
+			rc_out(bp, CD180_COR2, port->COR2);
+			rc_wait_CCR(bp);
+			rc_out(bp, CD180_CCR, CCR_CORCHG2);
+			port->break_length = 0;
+		}
+		return;
+	}
+	
+	count = CD180_NFIFO;
+	do {
+		rc_out(bp, CD180_TDR, port->xmit_buf[port->xmit_tail++]);
+		port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1);
+		if (--port->xmit_cnt <= 0)
+			break;
+	} while (--count > 0);
+	
+	if (port->xmit_cnt <= 0)  {
+		rc_out(bp, CD180_CAR, port_No(port));
+		port->IER &= ~IER_TXRDY;
+		rc_out(bp, CD180_IER, port->IER);
+	}
+	if (port->xmit_cnt <= port->wakeup_chars)
+		rc_mark_event(port, RS_EVENT_WRITE_WAKEUP);
+}
+
+static inline void rc_check_modem(struct riscom_board const * bp)
+{
+	struct riscom_port *port;
+	struct tty_struct *tty;
+	unsigned char mcr;
+	
+	if (!(port = rc_get_port(bp, "Modem")))
+		return;
+	
+	tty = port->tty;
+	
+	mcr = rc_in(bp, CD180_MCR);
+	if (mcr & MCR_CDCHG)  {
+		if (rc_in(bp, CD180_MSVR) & MSVR_CD) 
+			wake_up_interruptible(&port->open_wait);
+		else
+			schedule_work(&port->tqueue_hangup);
+	}
+	
+#ifdef RISCOM_BRAIN_DAMAGED_CTS
+	if (mcr & MCR_CTSCHG)  {
+		if (rc_in(bp, CD180_MSVR) & MSVR_CTS)  {
+			tty->hw_stopped = 0;
+			port->IER |= IER_TXRDY;
+			if (port->xmit_cnt <= port->wakeup_chars)
+				rc_mark_event(port, RS_EVENT_WRITE_WAKEUP);
+		} else  {
+			tty->hw_stopped = 1;
+			port->IER &= ~IER_TXRDY;
+		}
+		rc_out(bp, CD180_IER, port->IER);
+	}
+	if (mcr & MCR_DSRCHG)  {
+		if (rc_in(bp, CD180_MSVR) & MSVR_DSR)  {
+			tty->hw_stopped = 0;
+			port->IER |= IER_TXRDY;
+			if (port->xmit_cnt <= port->wakeup_chars)
+				rc_mark_event(port, RS_EVENT_WRITE_WAKEUP);
+		} else  {
+			tty->hw_stopped = 1;
+			port->IER &= ~IER_TXRDY;
+		}
+		rc_out(bp, CD180_IER, port->IER);
+	}
+#endif /* RISCOM_BRAIN_DAMAGED_CTS */
+	
+	/* Clear change bits */
+	rc_out(bp, CD180_MCR, 0);
+}
+
+/* The main interrupt processing routine */
+static irqreturn_t rc_interrupt(int irq, void * dev_id, struct pt_regs * regs)
+{
+	unsigned char status;
+	unsigned char ack;
+	struct riscom_board *bp;
+	unsigned long loop = 0;
+	int handled = 0;
+
+	bp = IRQ_to_board[irq];
+	
+	if (!bp || !(bp->flags & RC_BOARD_ACTIVE))  {
+		return IRQ_NONE;
+	}
+	
+	while ((++loop < 16) && ((status = ~(rc_in(bp, RC_BSR))) &
+				 (RC_BSR_TOUT | RC_BSR_TINT |
+				  RC_BSR_MINT | RC_BSR_RINT))) {
+		handled = 1;
+		if (status & RC_BSR_TOUT) 
+			printk(KERN_WARNING "rc%d: Got timeout. Hardware "
+					    "error?\n", board_No(bp));
+		
+		else if (status & RC_BSR_RINT) {
+			ack = rc_in(bp, RC_ACK_RINT);
+		
+			if (ack == (RC_ID | GIVR_IT_RCV))
+				rc_receive(bp);
+			else if (ack == (RC_ID | GIVR_IT_REXC))
+				rc_receive_exc(bp);
+			else
+				printk(KERN_WARNING "rc%d: Bad receive ack "
+						    "0x%02x.\n",
+				       board_No(bp), ack);
+		
+		} else if (status & RC_BSR_TINT) {
+			ack = rc_in(bp, RC_ACK_TINT);
+		
+			if (ack == (RC_ID | GIVR_IT_TX))
+				rc_transmit(bp);
+			else
+				printk(KERN_WARNING "rc%d: Bad transmit ack "
+						    "0x%02x.\n",
+				       board_No(bp), ack);
+		
+		} else /* if (status & RC_BSR_MINT) */ {
+			ack = rc_in(bp, RC_ACK_MINT);
+		
+			if (ack == (RC_ID | GIVR_IT_MODEM)) 
+				rc_check_modem(bp);
+			else
+				printk(KERN_WARNING "rc%d: Bad modem ack "
+						    "0x%02x.\n",
+				       board_No(bp), ack);
+		
+		} 
+
+		rc_out(bp, CD180_EOIR, 0);   /* Mark end of interrupt */
+		rc_out(bp, RC_CTOUT, 0);     /* Clear timeout flag    */
+	}
+	return IRQ_RETVAL(handled);
+}
+
+/*
+ *  Routines for open & close processing.
+ */
+
+/* Called with disabled interrupts */
+static inline int rc_setup_board(struct riscom_board * bp)
+{
+	int error;
+
+	if (bp->flags & RC_BOARD_ACTIVE) 
+		return 0;
+	
+	error = request_irq(bp->irq, rc_interrupt, SA_INTERRUPT,
+			    "RISCom/8", NULL);
+	if (error) 
+		return error;
+	
+	rc_out(bp, RC_CTOUT, 0);       		/* Just in case         */
+	bp->DTR = ~0;
+	rc_out(bp, RC_DTR, bp->DTR);	        /* Drop DTR on all ports */
+	
+	IRQ_to_board[bp->irq] = bp;
+	bp->flags |= RC_BOARD_ACTIVE;
+	
+	return 0;
+}
+
+/* Called with disabled interrupts */
+static inline void rc_shutdown_board(struct riscom_board *bp)
+{
+	if (!(bp->flags & RC_BOARD_ACTIVE))
+		return;
+	
+	bp->flags &= ~RC_BOARD_ACTIVE;
+	
+	free_irq(bp->irq, NULL);
+	IRQ_to_board[bp->irq] = NULL;
+	
+	bp->DTR = ~0;
+	rc_out(bp, RC_DTR, bp->DTR);	       /* Drop DTR on all ports */
+	
+}
+
+/*
+ * Setting up port characteristics. 
+ * Must be called with disabled interrupts
+ */
+static void rc_change_speed(struct riscom_board *bp, struct riscom_port *port)
+{
+	struct tty_struct *tty;
+	unsigned long baud;
+	long tmp;
+	unsigned char cor1 = 0, cor3 = 0;
+	unsigned char mcor1 = 0, mcor2 = 0;
+	
+	if (!(tty = port->tty) || !tty->termios)
+		return;
+
+	port->IER  = 0;
+	port->COR2 = 0;
+	port->MSVR = MSVR_RTS;
+	
+	baud = C_BAUD(tty);
+	
+	if (baud & CBAUDEX) {
+		baud &= ~CBAUDEX;
+		if (baud < 1 || baud > 2) 
+			port->tty->termios->c_cflag &= ~CBAUDEX;
+		else
+			baud += 15;
+	}
+	if (baud == 15)  {
+		if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+			baud ++;
+		if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+			baud += 2;
+	}
+	
+	/* Select port on the board */
+	rc_out(bp, CD180_CAR, port_No(port));
+	
+	if (!baud_table[baud])  {
+		/* Drop DTR & exit */
+		bp->DTR |= (1u << port_No(port));
+		rc_out(bp, RC_DTR, bp->DTR);
+		return;
+	} else  {
+		/* Set DTR on */
+		bp->DTR &= ~(1u << port_No(port));
+		rc_out(bp, RC_DTR, bp->DTR);
+	}
+	
+	/*
+	 * Now we must calculate some speed depended things 
+	 */
+	
+	/* Set baud rate for port */
+	tmp = (((RC_OSCFREQ + baud_table[baud]/2) / baud_table[baud] +
+		CD180_TPC/2) / CD180_TPC);
+
+	rc_out(bp, CD180_RBPRH, (tmp >> 8) & 0xff); 
+	rc_out(bp, CD180_TBPRH, (tmp >> 8) & 0xff); 
+	rc_out(bp, CD180_RBPRL, tmp & 0xff); 
+	rc_out(bp, CD180_TBPRL, tmp & 0xff);
+	
+	baud = (baud_table[baud] + 5) / 10;   /* Estimated CPS */
+	
+	/* Two timer ticks seems enough to wakeup something like SLIP driver */
+	tmp = ((baud + HZ/2) / HZ) * 2 - CD180_NFIFO;		
+	port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ?
+					      SERIAL_XMIT_SIZE - 1 : tmp);
+	
+	/* Receiver timeout will be transmission time for 1.5 chars */
+	tmp = (RISCOM_TPS + RISCOM_TPS/2 + baud/2) / baud;
+	tmp = (tmp > 0xff) ? 0xff : tmp;
+	rc_out(bp, CD180_RTPR, tmp);
+	
+	switch (C_CSIZE(tty))  {
+	 case CS5:
+		cor1 |= COR1_5BITS;
+		break;
+	 case CS6:
+		cor1 |= COR1_6BITS;
+		break;
+	 case CS7:
+		cor1 |= COR1_7BITS;
+		break;
+	 case CS8:
+		cor1 |= COR1_8BITS;
+		break;
+	}
+	
+	if (C_CSTOPB(tty)) 
+		cor1 |= COR1_2SB;
+	
+	cor1 |= COR1_IGNORE;
+	if (C_PARENB(tty))  {
+		cor1 |= COR1_NORMPAR;
+		if (C_PARODD(tty)) 
+			cor1 |= COR1_ODDP;
+		if (I_INPCK(tty)) 
+			cor1 &= ~COR1_IGNORE;
+	}
+	/* Set marking of some errors */
+	port->mark_mask = RCSR_OE | RCSR_TOUT;
+	if (I_INPCK(tty)) 
+		port->mark_mask |= RCSR_FE | RCSR_PE;
+	if (I_BRKINT(tty) || I_PARMRK(tty)) 
+		port->mark_mask |= RCSR_BREAK;
+	if (I_IGNPAR(tty)) 
+		port->mark_mask &= ~(RCSR_FE | RCSR_PE);
+	if (I_IGNBRK(tty))  {
+		port->mark_mask &= ~RCSR_BREAK;
+		if (I_IGNPAR(tty)) 
+			/* Real raw mode. Ignore all */
+			port->mark_mask &= ~RCSR_OE;
+	}
+	/* Enable Hardware Flow Control */
+	if (C_CRTSCTS(tty))  {
+#ifdef RISCOM_BRAIN_DAMAGED_CTS
+		port->IER |= IER_DSR | IER_CTS;
+		mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD;
+		mcor2 |= MCOR2_DSROD | MCOR2_CTSOD;
+		tty->hw_stopped = !(rc_in(bp, CD180_MSVR) & (MSVR_CTS|MSVR_DSR));
+#else
+		port->COR2 |= COR2_CTSAE;
+#endif
+	}
+	/* Enable Software Flow Control. FIXME: I'm not sure about this */
+	/* Some people reported that it works, but I still doubt */
+	if (I_IXON(tty))  {
+		port->COR2 |= COR2_TXIBE;
+		cor3 |= (COR3_FCT | COR3_SCDE);
+		if (I_IXANY(tty))
+			port->COR2 |= COR2_IXM;
+		rc_out(bp, CD180_SCHR1, START_CHAR(tty));
+		rc_out(bp, CD180_SCHR2, STOP_CHAR(tty));
+		rc_out(bp, CD180_SCHR3, START_CHAR(tty));
+		rc_out(bp, CD180_SCHR4, STOP_CHAR(tty));
+	}
+	if (!C_CLOCAL(tty))  {
+		/* Enable CD check */
+		port->IER |= IER_CD;
+		mcor1 |= MCOR1_CDZD;
+		mcor2 |= MCOR2_CDOD;
+	}
+	
+	if (C_CREAD(tty)) 
+		/* Enable receiver */
+		port->IER |= IER_RXD;
+	
+	/* Set input FIFO size (1-8 bytes) */
+	cor3 |= RISCOM_RXFIFO; 
+	/* Setting up CD180 channel registers */
+	rc_out(bp, CD180_COR1, cor1);
+	rc_out(bp, CD180_COR2, port->COR2);
+	rc_out(bp, CD180_COR3, cor3);
+	/* Make CD180 know about registers change */
+	rc_wait_CCR(bp);
+	rc_out(bp, CD180_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3);
+	/* Setting up modem option registers */
+	rc_out(bp, CD180_MCOR1, mcor1);
+	rc_out(bp, CD180_MCOR2, mcor2);
+	/* Enable CD180 transmitter & receiver */
+	rc_wait_CCR(bp);
+	rc_out(bp, CD180_CCR, CCR_TXEN | CCR_RXEN);
+	/* Enable interrupts */
+	rc_out(bp, CD180_IER, port->IER);
+	/* And finally set RTS on */
+	rc_out(bp, CD180_MSVR, port->MSVR);
+}
+
+/* Must be called with interrupts enabled */
+static int rc_setup_port(struct riscom_board *bp, struct riscom_port *port)
+{
+	unsigned long flags;
+	
+	if (port->flags & ASYNC_INITIALIZED)
+		return 0;
+	
+	if (!port->xmit_buf) {
+		/* We may sleep in get_zeroed_page() */
+		unsigned long tmp;
+		
+		if (!(tmp = get_zeroed_page(GFP_KERNEL)))
+			return -ENOMEM;
+		    
+		if (port->xmit_buf) {
+			free_page(tmp);
+			return -ERESTARTSYS;
+		}
+		port->xmit_buf = (unsigned char *) tmp;
+	}
+		
+	save_flags(flags); cli();
+		
+	if (port->tty) 
+		clear_bit(TTY_IO_ERROR, &port->tty->flags);
+		
+	if (port->count == 1) 
+		bp->count++;
+		
+	port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
+	rc_change_speed(bp, port);
+	port->flags |= ASYNC_INITIALIZED;
+		
+	restore_flags(flags);
+	return 0;
+}
+
+/* Must be called with interrupts disabled */
+static void rc_shutdown_port(struct riscom_board *bp, struct riscom_port *port)
+{
+	struct tty_struct *tty;
+	
+	if (!(port->flags & ASYNC_INITIALIZED)) 
+		return;
+	
+#ifdef RC_REPORT_OVERRUN
+	printk(KERN_INFO "rc%d: port %d: Total %ld overruns were detected.\n",
+	       board_No(bp), port_No(port), port->overrun);
+#endif	
+#ifdef RC_REPORT_FIFO
+	{
+		int i;
+		
+		printk(KERN_INFO "rc%d: port %d: FIFO hits [ ",
+		       board_No(bp), port_No(port));
+		for (i = 0; i < 10; i++)  {
+			printk("%ld ", port->hits[i]);
+		}
+		printk("].\n");
+	}
+#endif	
+	if (port->xmit_buf)  {
+		free_page((unsigned long) port->xmit_buf);
+		port->xmit_buf = NULL;
+	}
+
+	if (!(tty = port->tty) || C_HUPCL(tty))  {
+		/* Drop DTR */
+		bp->DTR |= (1u << port_No(port));
+		rc_out(bp, RC_DTR, bp->DTR);
+	}
+	
+        /* Select port */
+	rc_out(bp, CD180_CAR, port_No(port));
+	/* Reset port */
+	rc_wait_CCR(bp);
+	rc_out(bp, CD180_CCR, CCR_SOFTRESET);
+	/* Disable all interrupts from this port */
+	port->IER = 0;
+	rc_out(bp, CD180_IER, port->IER);
+	
+	if (tty)  
+		set_bit(TTY_IO_ERROR, &tty->flags);
+	port->flags &= ~ASYNC_INITIALIZED;
+	
+	if (--bp->count < 0)  {
+		printk(KERN_INFO "rc%d: rc_shutdown_port: "
+				 "bad board count: %d\n",
+		       board_No(bp), bp->count);
+		bp->count = 0;
+	}
+	
+	/*
+	 * If this is the last opened port on the board
+	 * shutdown whole board
+	 */
+	if (!bp->count) 
+		rc_shutdown_board(bp);
+}
+
+	
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+			   struct riscom_port *port)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	struct riscom_board *bp = port_Board(port);
+	int    retval;
+	int    do_clocal = 0;
+	int    CD;
+
+	/*
+	 * If the device is in the middle of being closed, then block
+	 * until it's done, and then try again.
+	 */
+	if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
+		interruptible_sleep_on(&port->close_wait);
+		if (port->flags & ASYNC_HUP_NOTIFY)
+			return -EAGAIN;
+		else
+			return -ERESTARTSYS;
+	}
+
+	/*
+	 * If non-blocking mode is set, or the port is not enabled,
+	 * then make the check up front and then exit.
+	 */
+	if ((filp->f_flags & O_NONBLOCK) ||
+	    (tty->flags & (1 << TTY_IO_ERROR))) {
+		port->flags |= ASYNC_NORMAL_ACTIVE;
+		return 0;
+	}
+
+	if (C_CLOCAL(tty))  
+		do_clocal = 1;
+
+	/*
+	 * Block waiting for the carrier detect and the line to become
+	 * free (i.e., not in use by the callout).  While we are in
+	 * this loop, info->count is dropped by one, so that
+	 * rs_close() knows when to free things.  We restore it upon
+	 * exit, either normal or abnormal.
+	 */
+	retval = 0;
+	add_wait_queue(&port->open_wait, &wait);
+	cli();
+	if (!tty_hung_up_p(filp))
+		port->count--;
+	sti();
+	port->blocked_open++;
+	while (1) {
+		cli();
+		rc_out(bp, CD180_CAR, port_No(port));
+		CD = rc_in(bp, CD180_MSVR) & MSVR_CD;
+		rc_out(bp, CD180_MSVR, MSVR_RTS);
+		bp->DTR &= ~(1u << port_No(port));
+		rc_out(bp, RC_DTR, bp->DTR);
+		sti();
+		set_current_state(TASK_INTERRUPTIBLE);
+		if (tty_hung_up_p(filp) ||
+		    !(port->flags & ASYNC_INITIALIZED)) {
+			if (port->flags & ASYNC_HUP_NOTIFY)
+				retval = -EAGAIN;
+			else
+				retval = -ERESTARTSYS;	
+			break;
+		}
+		if (!(port->flags & ASYNC_CLOSING) &&
+		    (do_clocal || CD))
+			break;
+		if (signal_pending(current)) {
+			retval = -ERESTARTSYS;
+			break;
+		}
+		schedule();
+	}
+	current->state = TASK_RUNNING;
+	remove_wait_queue(&port->open_wait, &wait);
+	if (!tty_hung_up_p(filp))
+		port->count++;
+	port->blocked_open--;
+	if (retval)
+		return retval;
+	
+	port->flags |= ASYNC_NORMAL_ACTIVE;
+	return 0;
+}	
+
+static int rc_open(struct tty_struct * tty, struct file * filp)
+{
+	int board;
+	int error;
+	struct riscom_port * port;
+	struct riscom_board * bp;
+	
+	board = RC_BOARD(tty->index);
+	if (board >= RC_NBOARD || !(rc_board[board].flags & RC_BOARD_PRESENT))
+		return -ENODEV;
+	
+	bp = &rc_board[board];
+	port = rc_port + board * RC_NPORT + RC_PORT(tty->index);
+	if (rc_paranoia_check(port, tty->name, "rc_open"))
+		return -ENODEV;
+	
+	if ((error = rc_setup_board(bp))) 
+		return error;
+		
+	port->count++;
+	tty->driver_data = port;
+	port->tty = tty;
+	
+	if ((error = rc_setup_port(bp, port))) 
+		return error;
+	
+	if ((error = block_til_ready(tty, filp, port)))
+		return error;
+	
+	return 0;
+}
+
+static void rc_close(struct tty_struct * tty, struct file * filp)
+{
+	struct riscom_port *port = (struct riscom_port *) tty->driver_data;
+	struct riscom_board *bp;
+	unsigned long flags;
+	unsigned long timeout;
+	
+	if (!port || rc_paranoia_check(port, tty->name, "close"))
+		return;
+	
+	save_flags(flags); cli();
+	if (tty_hung_up_p(filp))
+		goto out;
+	
+	bp = port_Board(port);
+	if ((tty->count == 1) && (port->count != 1))  {
+		printk(KERN_INFO "rc%d: rc_close: bad port count;"
+		       " tty->count is 1, port count is %d\n",
+		       board_No(bp), port->count);
+		port->count = 1;
+	}
+	if (--port->count < 0)  {
+		printk(KERN_INFO "rc%d: rc_close: bad port count "
+				 "for tty%d: %d\n",
+		       board_No(bp), port_No(port), port->count);
+		port->count = 0;
+	}
+	if (port->count)
+		goto out;
+	port->flags |= ASYNC_CLOSING;
+	/*
+	 * Now we wait for the transmit buffer to clear; and we notify 
+	 * the line discipline to only process XON/XOFF characters.
+	 */
+	tty->closing = 1;
+	if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+		tty_wait_until_sent(tty, port->closing_wait);
+	/*
+	 * At this point we stop accepting input.  To do this, we
+	 * disable the receive line status interrupts, and tell the
+	 * interrupt driver to stop checking the data ready bit in the
+	 * line status register.
+	 */
+	port->IER &= ~IER_RXD;
+	if (port->flags & ASYNC_INITIALIZED) {
+		port->IER &= ~IER_TXRDY;
+		port->IER |= IER_TXEMPTY;
+		rc_out(bp, CD180_CAR, port_No(port));
+		rc_out(bp, CD180_IER, port->IER);
+		/*
+		 * Before we drop DTR, make sure the UART transmitter
+		 * has completely drained; this is especially
+		 * important if there is a transmit FIFO!
+		 */
+		timeout = jiffies+HZ;
+		while(port->IER & IER_TXEMPTY)  {
+			msleep_interruptible(jiffies_to_msecs(port->timeout));
+			if (time_after(jiffies, timeout))
+				break;
+		}
+	}
+	rc_shutdown_port(bp, port);
+	if (tty->driver->flush_buffer)
+		tty->driver->flush_buffer(tty);
+	tty_ldisc_flush(tty);
+
+	tty->closing = 0;
+	port->event = 0;
+	port->tty = NULL;
+	if (port->blocked_open) {
+		if (port->close_delay) {
+			msleep_interruptible(jiffies_to_msecs(port->close_delay));
+		}
+		wake_up_interruptible(&port->open_wait);
+	}
+	port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
+	wake_up_interruptible(&port->close_wait);
+out:	restore_flags(flags);
+}
+
+static int rc_write(struct tty_struct * tty, 
+		    const unsigned char *buf, int count)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	struct riscom_board *bp;
+	int c, total = 0;
+	unsigned long flags;
+				
+	if (rc_paranoia_check(port, tty->name, "rc_write"))
+		return 0;
+	
+	bp = port_Board(port);
+
+	if (!tty || !port->xmit_buf || !tmp_buf)
+		return 0;
+
+	save_flags(flags);
+	while (1) {
+		cli();		
+		c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
+					  SERIAL_XMIT_SIZE - port->xmit_head));
+		if (c <= 0) {
+			restore_flags(flags);
+			break;
+		}
+
+		memcpy(port->xmit_buf + port->xmit_head, buf, c);
+		port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
+		port->xmit_cnt += c;
+		restore_flags(flags);
+
+		buf += c;
+		count -= c;
+		total += c;
+	}
+
+	cli();
+	if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
+	    !(port->IER & IER_TXRDY)) {
+		port->IER |= IER_TXRDY;
+		rc_out(bp, CD180_CAR, port_No(port));
+		rc_out(bp, CD180_IER, port->IER);
+	}
+	restore_flags(flags);
+
+	return total;
+}
+
+static void rc_put_char(struct tty_struct * tty, unsigned char ch)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	unsigned long flags;
+
+	if (rc_paranoia_check(port, tty->name, "rc_put_char"))
+		return;
+
+	if (!tty || !port->xmit_buf)
+		return;
+
+	save_flags(flags); cli();
+	
+	if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
+		goto out;
+
+	port->xmit_buf[port->xmit_head++] = ch;
+	port->xmit_head &= SERIAL_XMIT_SIZE - 1;
+	port->xmit_cnt++;
+out:	restore_flags(flags);
+}
+
+static void rc_flush_chars(struct tty_struct * tty)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	unsigned long flags;
+				
+	if (rc_paranoia_check(port, tty->name, "rc_flush_chars"))
+		return;
+	
+	if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+	    !port->xmit_buf)
+		return;
+
+	save_flags(flags); cli();
+	port->IER |= IER_TXRDY;
+	rc_out(port_Board(port), CD180_CAR, port_No(port));
+	rc_out(port_Board(port), CD180_IER, port->IER);
+	restore_flags(flags);
+}
+
+static int rc_write_room(struct tty_struct * tty)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	int	ret;
+				
+	if (rc_paranoia_check(port, tty->name, "rc_write_room"))
+		return 0;
+
+	ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
+	if (ret < 0)
+		ret = 0;
+	return ret;
+}
+
+static int rc_chars_in_buffer(struct tty_struct *tty)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+				
+	if (rc_paranoia_check(port, tty->name, "rc_chars_in_buffer"))
+		return 0;
+	
+	return port->xmit_cnt;
+}
+
+static void rc_flush_buffer(struct tty_struct *tty)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	unsigned long flags;
+				
+	if (rc_paranoia_check(port, tty->name, "rc_flush_buffer"))
+		return;
+
+	save_flags(flags); cli();
+	port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
+	restore_flags(flags);
+	
+	wake_up_interruptible(&tty->write_wait);
+	tty_wakeup(tty);
+}
+
+static int rc_tiocmget(struct tty_struct *tty, struct file *file)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	struct riscom_board * bp;
+	unsigned char status;
+	unsigned int result;
+	unsigned long flags;
+
+	if (rc_paranoia_check(port, tty->name, __FUNCTION__))
+		return -ENODEV;
+
+	bp = port_Board(port);
+	save_flags(flags); cli();
+	rc_out(bp, CD180_CAR, port_No(port));
+	status = rc_in(bp, CD180_MSVR);
+	result = rc_in(bp, RC_RI) & (1u << port_No(port)) ? 0 : TIOCM_RNG;
+	restore_flags(flags);
+	result |= ((status & MSVR_RTS) ? TIOCM_RTS : 0)
+		| ((status & MSVR_DTR) ? TIOCM_DTR : 0)
+		| ((status & MSVR_CD)  ? TIOCM_CAR : 0)
+		| ((status & MSVR_DSR) ? TIOCM_DSR : 0)
+		| ((status & MSVR_CTS) ? TIOCM_CTS : 0);
+	return result;
+}
+
+static int rc_tiocmset(struct tty_struct *tty, struct file *file,
+		       unsigned int set, unsigned int clear)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	unsigned long flags;
+	struct riscom_board *bp;
+
+	if (rc_paranoia_check(port, tty->name, __FUNCTION__))
+		return -ENODEV;
+
+	bp = port_Board(port);
+
+	save_flags(flags); cli();
+	if (set & TIOCM_RTS)
+		port->MSVR |= MSVR_RTS;
+	if (set & TIOCM_DTR)
+		bp->DTR &= ~(1u << port_No(port));
+
+	if (clear & TIOCM_RTS)
+		port->MSVR &= ~MSVR_RTS;
+	if (clear & TIOCM_DTR)
+		bp->DTR |= (1u << port_No(port));
+
+	rc_out(bp, CD180_CAR, port_No(port));
+	rc_out(bp, CD180_MSVR, port->MSVR);
+	rc_out(bp, RC_DTR, bp->DTR);
+	restore_flags(flags);
+	return 0;
+}
+
+static inline void rc_send_break(struct riscom_port * port, unsigned long length)
+{
+	struct riscom_board *bp = port_Board(port);
+	unsigned long flags;
+	
+	save_flags(flags); cli();
+	port->break_length = RISCOM_TPS / HZ * length;
+	port->COR2 |= COR2_ETC;
+	port->IER  |= IER_TXRDY;
+	rc_out(bp, CD180_CAR, port_No(port));
+	rc_out(bp, CD180_COR2, port->COR2);
+	rc_out(bp, CD180_IER, port->IER);
+	rc_wait_CCR(bp);
+	rc_out(bp, CD180_CCR, CCR_CORCHG2);
+	rc_wait_CCR(bp);
+	restore_flags(flags);
+}
+
+static inline int rc_set_serial_info(struct riscom_port * port,
+				     struct serial_struct __user * newinfo)
+{
+	struct serial_struct tmp;
+	struct riscom_board *bp = port_Board(port);
+	int change_speed;
+	unsigned long flags;
+	
+	if (copy_from_user(&tmp, newinfo, sizeof(tmp)))
+		return -EFAULT;
+	
+#if 0	
+	if ((tmp.irq != bp->irq) ||
+	    (tmp.port != bp->base) ||
+	    (tmp.type != PORT_CIRRUS) ||
+	    (tmp.baud_base != (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC) ||
+	    (tmp.custom_divisor != 0) ||
+	    (tmp.xmit_fifo_size != CD180_NFIFO) ||
+	    (tmp.flags & ~RISCOM_LEGAL_FLAGS))
+		return -EINVAL;
+#endif	
+	
+	change_speed = ((port->flags & ASYNC_SPD_MASK) !=
+			(tmp.flags & ASYNC_SPD_MASK));
+	
+	if (!capable(CAP_SYS_ADMIN)) {
+		if ((tmp.close_delay != port->close_delay) ||
+		    (tmp.closing_wait != port->closing_wait) ||
+		    ((tmp.flags & ~ASYNC_USR_MASK) !=
+		     (port->flags & ~ASYNC_USR_MASK)))  
+			return -EPERM;
+		port->flags = ((port->flags & ~ASYNC_USR_MASK) |
+			       (tmp.flags & ASYNC_USR_MASK));
+	} else  {
+		port->flags = ((port->flags & ~ASYNC_FLAGS) |
+			       (tmp.flags & ASYNC_FLAGS));
+		port->close_delay = tmp.close_delay;
+		port->closing_wait = tmp.closing_wait;
+	}
+	if (change_speed)  {
+		save_flags(flags); cli();
+		rc_change_speed(bp, port);
+		restore_flags(flags);
+	}
+	return 0;
+}
+
+static inline int rc_get_serial_info(struct riscom_port * port,
+				     struct serial_struct __user *retinfo)
+{
+	struct serial_struct tmp;
+	struct riscom_board *bp = port_Board(port);
+	
+	memset(&tmp, 0, sizeof(tmp));
+	tmp.type = PORT_CIRRUS;
+	tmp.line = port - rc_port;
+	tmp.port = bp->base;
+	tmp.irq  = bp->irq;
+	tmp.flags = port->flags;
+	tmp.baud_base = (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC;
+	tmp.close_delay = port->close_delay * HZ/100;
+	tmp.closing_wait = port->closing_wait * HZ/100;
+	tmp.xmit_fifo_size = CD180_NFIFO;
+	return copy_to_user(retinfo, &tmp, sizeof(tmp)) ? -EFAULT : 0;
+}
+
+static int rc_ioctl(struct tty_struct * tty, struct file * filp, 
+		    unsigned int cmd, unsigned long arg)
+		    
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	void __user *argp = (void __user *)arg;
+	int retval;
+				
+	if (rc_paranoia_check(port, tty->name, "rc_ioctl"))
+		return -ENODEV;
+	
+	switch (cmd) {
+	 case TCSBRK:	/* SVID version: non-zero arg --> no break */
+		retval = tty_check_change(tty);
+		if (retval)
+			return retval;
+		tty_wait_until_sent(tty, 0);
+		if (!arg)
+			rc_send_break(port, HZ/4);	/* 1/4 second */
+		break;
+	 case TCSBRKP:	/* support for POSIX tcsendbreak() */
+		retval = tty_check_change(tty);
+		if (retval)
+			return retval;
+		tty_wait_until_sent(tty, 0);
+		rc_send_break(port, arg ? arg*(HZ/10) : HZ/4);
+		break;
+	 case TIOCGSOFTCAR:
+		return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned __user *)argp);
+	 case TIOCSSOFTCAR:
+		if (get_user(arg,(unsigned __user *) argp))
+			return -EFAULT;
+		tty->termios->c_cflag =
+			((tty->termios->c_cflag & ~CLOCAL) |
+			(arg ? CLOCAL : 0));
+		break;
+	 case TIOCGSERIAL:	
+		return rc_get_serial_info(port, argp);
+	 case TIOCSSERIAL:	
+		return rc_set_serial_info(port, argp);
+	 default:
+		return -ENOIOCTLCMD;
+	}
+	return 0;
+}
+
+static void rc_throttle(struct tty_struct * tty)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	struct riscom_board *bp;
+	unsigned long flags;
+				
+	if (rc_paranoia_check(port, tty->name, "rc_throttle"))
+		return;
+	
+	bp = port_Board(port);
+	
+	save_flags(flags); cli();
+	port->MSVR &= ~MSVR_RTS;
+	rc_out(bp, CD180_CAR, port_No(port));
+	if (I_IXOFF(tty))  {
+		rc_wait_CCR(bp);
+		rc_out(bp, CD180_CCR, CCR_SSCH2);
+		rc_wait_CCR(bp);
+	}
+	rc_out(bp, CD180_MSVR, port->MSVR);
+	restore_flags(flags);
+}
+
+static void rc_unthrottle(struct tty_struct * tty)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	struct riscom_board *bp;
+	unsigned long flags;
+				
+	if (rc_paranoia_check(port, tty->name, "rc_unthrottle"))
+		return;
+	
+	bp = port_Board(port);
+	
+	save_flags(flags); cli();
+	port->MSVR |= MSVR_RTS;
+	rc_out(bp, CD180_CAR, port_No(port));
+	if (I_IXOFF(tty))  {
+		rc_wait_CCR(bp);
+		rc_out(bp, CD180_CCR, CCR_SSCH1);
+		rc_wait_CCR(bp);
+	}
+	rc_out(bp, CD180_MSVR, port->MSVR);
+	restore_flags(flags);
+}
+
+static void rc_stop(struct tty_struct * tty)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	struct riscom_board *bp;
+	unsigned long flags;
+				
+	if (rc_paranoia_check(port, tty->name, "rc_stop"))
+		return;
+	
+	bp = port_Board(port);
+	
+	save_flags(flags); cli();
+	port->IER &= ~IER_TXRDY;
+	rc_out(bp, CD180_CAR, port_No(port));
+	rc_out(bp, CD180_IER, port->IER);
+	restore_flags(flags);
+}
+
+static void rc_start(struct tty_struct * tty)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	struct riscom_board *bp;
+	unsigned long flags;
+				
+	if (rc_paranoia_check(port, tty->name, "rc_start"))
+		return;
+	
+	bp = port_Board(port);
+	
+	save_flags(flags); cli();
+	if (port->xmit_cnt && port->xmit_buf && !(port->IER & IER_TXRDY))  {
+		port->IER |= IER_TXRDY;
+		rc_out(bp, CD180_CAR, port_No(port));
+		rc_out(bp, CD180_IER, port->IER);
+	}
+	restore_flags(flags);
+}
+
+/*
+ * This routine is called from the work queue when the interrupt
+ * routine has signalled that a hangup has occurred.  The path of
+ * hangup processing is:
+ *
+ * 	serial interrupt routine -> (workqueue) ->
+ * 	do_rc_hangup() -> tty->hangup() -> rc_hangup()
+ * 
+ */
+static void do_rc_hangup(void *private_)
+{
+	struct riscom_port	*port = (struct riscom_port *) private_;
+	struct tty_struct	*tty;
+	
+	tty = port->tty;
+	if (tty)
+		tty_hangup(tty);	/* FIXME: module removal race still here */
+}
+
+static void rc_hangup(struct tty_struct * tty)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	struct riscom_board *bp;
+				
+	if (rc_paranoia_check(port, tty->name, "rc_hangup"))
+		return;
+	
+	bp = port_Board(port);
+	
+	rc_shutdown_port(bp, port);
+	port->event = 0;
+	port->count = 0;
+	port->flags &= ~ASYNC_NORMAL_ACTIVE;
+	port->tty = NULL;
+	wake_up_interruptible(&port->open_wait);
+}
+
+static void rc_set_termios(struct tty_struct * tty, struct termios * old_termios)
+{
+	struct riscom_port *port = (struct riscom_port *)tty->driver_data;
+	unsigned long flags;
+				
+	if (rc_paranoia_check(port, tty->name, "rc_set_termios"))
+		return;
+	
+	if (tty->termios->c_cflag == old_termios->c_cflag &&
+	    tty->termios->c_iflag == old_termios->c_iflag)
+		return;
+
+	save_flags(flags); cli();
+	rc_change_speed(port_Board(port), port);
+	restore_flags(flags);
+
+	if ((old_termios->c_cflag & CRTSCTS) &&
+	    !(tty->termios->c_cflag & CRTSCTS)) {
+		tty->hw_stopped = 0;
+		rc_start(tty);
+	}
+}
+
+static void do_softint(void *private_)
+{
+	struct riscom_port	*port = (struct riscom_port *) private_;
+	struct tty_struct	*tty;
+	
+	if(!(tty = port->tty)) 
+		return;
+
+	if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &port->event)) {
+		tty_wakeup(tty);
+		wake_up_interruptible(&tty->write_wait);
+	}
+}
+
+static struct tty_operations riscom_ops = {
+	.open  = rc_open,
+	.close = rc_close,
+	.write = rc_write,
+	.put_char = rc_put_char,
+	.flush_chars = rc_flush_chars,
+	.write_room = rc_write_room,
+	.chars_in_buffer = rc_chars_in_buffer,
+	.flush_buffer = rc_flush_buffer,
+	.ioctl = rc_ioctl,
+	.throttle = rc_throttle,
+	.unthrottle = rc_unthrottle,
+	.set_termios = rc_set_termios,
+	.stop = rc_stop,
+	.start = rc_start,
+	.hangup = rc_hangup,
+	.tiocmget = rc_tiocmget,
+	.tiocmset = rc_tiocmset,
+};
+
+static inline int rc_init_drivers(void)
+{
+	int error;
+	int i;
+
+	riscom_driver = alloc_tty_driver(RC_NBOARD * RC_NPORT);
+	if (!riscom_driver)	
+		return -ENOMEM;
+	
+	if (!(tmp_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL))) {
+		printk(KERN_ERR "rc: Couldn't get free page.\n");
+		put_tty_driver(riscom_driver);
+		return 1;
+	}
+	memset(IRQ_to_board, 0, sizeof(IRQ_to_board));
+	riscom_driver->owner = THIS_MODULE;
+	riscom_driver->name = "ttyL";
+	riscom_driver->devfs_name = "tts/L";
+	riscom_driver->major = RISCOM8_NORMAL_MAJOR;
+	riscom_driver->type = TTY_DRIVER_TYPE_SERIAL;
+	riscom_driver->subtype = SERIAL_TYPE_NORMAL;
+	riscom_driver->init_termios = tty_std_termios;
+	riscom_driver->init_termios.c_cflag =
+		B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+	riscom_driver->flags = TTY_DRIVER_REAL_RAW;
+	tty_set_operations(riscom_driver, &riscom_ops);
+	if ((error = tty_register_driver(riscom_driver)))  {
+		free_page((unsigned long)tmp_buf);
+		put_tty_driver(riscom_driver);
+		printk(KERN_ERR "rc: Couldn't register RISCom/8 driver, "
+				"error = %d\n",
+		       error);
+		return 1;
+	}
+
+	memset(rc_port, 0, sizeof(rc_port));
+	for (i = 0; i < RC_NPORT * RC_NBOARD; i++)  {
+		rc_port[i].magic = RISCOM8_MAGIC;
+		INIT_WORK(&rc_port[i].tqueue, do_softint, &rc_port[i]);
+		INIT_WORK(&rc_port[i].tqueue_hangup, do_rc_hangup, &rc_port[i]);
+		rc_port[i].close_delay = 50 * HZ/100;
+		rc_port[i].closing_wait = 3000 * HZ/100;
+		init_waitqueue_head(&rc_port[i].open_wait);
+		init_waitqueue_head(&rc_port[i].close_wait);
+	}
+	
+	return 0;
+}
+
+static void rc_release_drivers(void)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	free_page((unsigned long)tmp_buf);
+	tty_unregister_driver(riscom_driver);
+	put_tty_driver(riscom_driver);
+	restore_flags(flags);
+}
+
+#ifndef MODULE
+/*
+ * Called at boot time.
+ * 
+ * You can specify IO base for up to RC_NBOARD cards,
+ * using line "riscom8=0xiobase1,0xiobase2,.." at LILO prompt.
+ * Note that there will be no probing at default
+ * addresses in this case.
+ *
+ */ 
+static int __init riscom8_setup(char *str)
+{
+	int ints[RC_NBOARD];
+	int i;
+
+	str = get_options(str, ARRAY_SIZE(ints), ints);
+
+	for (i = 0; i < RC_NBOARD; i++) {
+		if (i < ints[0])
+			rc_board[i].base = ints[i+1];
+		else 
+			rc_board[i].base = 0;
+	}
+	return 1;
+}
+
+__setup("riscom8=", riscom8_setup);
+#endif
+
+static char banner[] __initdata =
+	KERN_INFO "rc: SDL RISCom/8 card driver v1.1, (c) D.Gorodchanin "
+		  "1994-1996.\n";
+static char no_boards_msg[] __initdata =
+	KERN_INFO "rc: No RISCom/8 boards detected.\n";
+
+/* 
+ * This routine must be called by kernel at boot time 
+ */
+static int __init riscom8_init(void)
+{
+	int i;
+	int found = 0;
+
+	printk(banner);
+
+	if (rc_init_drivers()) 
+		return -EIO;
+
+	for (i = 0; i < RC_NBOARD; i++) 
+		if (rc_board[i].base && !rc_probe(&rc_board[i]))  
+			found++;
+	
+	if (!found)  {
+		rc_release_drivers();
+		printk(no_boards_msg);
+		return -EIO;
+	}
+	return 0;
+}
+
+#ifdef MODULE
+static int iobase;
+static int iobase1;
+static int iobase2;
+static int iobase3;
+MODULE_PARM(iobase, "i");
+MODULE_PARM(iobase1, "i");
+MODULE_PARM(iobase2, "i");
+MODULE_PARM(iobase3, "i");
+
+MODULE_LICENSE("GPL");
+#endif /* MODULE */
+
+/*
+ * You can setup up to 4 boards (current value of RC_NBOARD)
+ * by specifying "iobase=0xXXX iobase1=0xXXX ..." as insmod parameter.
+ *
+ */
+static int __init riscom8_init_module (void)
+{
+#ifdef MODULE
+	int i;
+
+	if (iobase || iobase1 || iobase2 || iobase3) {
+		for(i = 0; i < RC_NBOARD; i++)
+			rc_board[0].base = 0;
+	}
+
+	if (iobase)
+		rc_board[0].base = iobase;
+	if (iobase1)
+		rc_board[1].base = iobase1;
+	if (iobase2)
+		rc_board[2].base = iobase2;
+	if (iobase3)
+		rc_board[3].base = iobase3;
+#endif /* MODULE */
+
+	return riscom8_init();
+}
+	
+static void __exit riscom8_exit_module (void)
+{
+	int i;
+	
+	rc_release_drivers();
+	for (i = 0; i < RC_NBOARD; i++)  
+		if (rc_board[i].flags & RC_BOARD_PRESENT) 
+			rc_release_io_range(&rc_board[i]);
+	
+}
+
+module_init(riscom8_init_module);
+module_exit(riscom8_exit_module);
+