CRISv10 serial driver rewrite

New and improved serial driver for CRISv10, take three, with improvements
suggested by Jiri Slaby.

- Call wait_event_interruptible with a _correct_ and sensible condition.
- Removed superfluous test of info->flags & ASYNC_CLOSING, since that is done
  by wait_event_interruptible.
- Moved common code for deregistering DMA and IRQ to deinit_port function.
- Use setup_timer when initializing flush_timer.
- Convert bit-field for uses_dma_in and uses_dma_out to regular bytes.
- Removed CVS tags.
- Removed defines and comments for CRIS_BUF_SIZE and TTY_THRESHOLD_THROTTLE
  (no longer used).
- Cleaned up code to pass checkpatch.
- Add crisv10.h header file.
- Merge of CRISv10 from Axis internal CVS.

Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Reviewed-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Mikael Starvik <starvik@axis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 434 insertions, 859 deletions

diff --git a/drivers/serial/crisv10.c b/drivers/serial/crisv10.c
index f523cdf..a4e23cf 100644
--- a/drivers/serial/crisv10.c
+++ b/drivers/serial/crisv10.c
@@ -1,426 +1,10 @@
-/* $Id: serial.c,v 1.25 2004/09/29 10:33:49 starvik Exp $
- *
+/*
  * Serial port driver for the ETRAX 100LX chip
  *
- *    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003  Axis Communications AB
+ *    Copyright (C) 1998-2007  Axis Communications AB
  *
  *    Many, many authors. Based once upon a time on serial.c for 16x50.
  *
- * $Log: serial.c,v $
- * Revision 1.25  2004/09/29 10:33:49  starvik
- * Resolved a dealock when printing debug from kernel.
- *
- * Revision 1.24  2004/08/27 23:25:59  johana
- * rs_set_termios() must call change_speed() if c_iflag has changed or
- * automatic XOFF handling will be enabled and transmitter will stop
- * if 0x13 is received.
- *
- * Revision 1.23  2004/08/24 06:57:13  starvik
- * More whitespace cleanup
- *
- * Revision 1.22  2004/08/24 06:12:20  starvik
- * Whitespace cleanup
- *
- * Revision 1.20  2004/05/24 12:00:20  starvik
- * Big merge of stuff from Linux 2.4 (e.g. manual mode for the serial port).
- *
- * Revision 1.19  2004/05/17 13:12:15  starvik
- * Kernel console hook
- * Big merge from Linux 2.4 still pending.
- *
- * Revision 1.18  2003/10/28 07:18:30  starvik
- * Compiles with debug info
- *
- * Revision 1.17  2003/07/04 08:27:37  starvik
- * Merge of Linux 2.5.74
- *
- * Revision 1.16  2003/06/13 10:05:19  johana
- * Help the user to avoid trouble by:
- * Forcing mixed mode for status/control lines if not all pins are used.
- *
- * Revision 1.15  2003/06/13 09:43:01  johana
- * Merged in the following changes from os/linux/arch/cris/drivers/serial.c
- * + some minor changes to reduce diff.
- *
- * Revision 1.49  2003/05/30 11:31:54  johana
- * Merged in change-branch--serial9bit that adds CMSPAR support for sticky
- * parity (mark/space)
- *
- * Revision 1.48  2003/05/30 11:03:57  johana
- * Implemented rs_send_xchar() by disabling the DMA and writing manually.
- * Added e100_disable_txdma_channel() and e100_enable_txdma_channel().
- * Fixed rs_throttle() and rs_unthrottle() to properly call rs_send_xchar
- * instead of setting info->x_char and check the CRTSCTS flag before
- * controlling the rts pin.
- *
- * Revision 1.14  2003/04/09 08:12:44  pkj
- * Corrected typo changes made upstream.
- *
- * Revision 1.13  2003/04/09 05:20:47  starvik
- * Merge of Linux 2.5.67
- *
- * Revision 1.11  2003/01/22 06:48:37  starvik
- * Fixed warnings issued by GCC 3.2.1
- *
- * Revision 1.9  2002/12/13 09:07:47  starvik
- * Alert user that RX_TIMEOUT_TICKS==0 doesn't work
- *
- * Revision 1.8  2002/12/11 13:13:57  starvik
- * Added arch/ to v10 specific includes
- * Added fix from Linux 2.4 in serial.c (flush_to_flip_buffer)
- *
- * Revision 1.7  2002/12/06 07:13:57  starvik
- * Corrected work queue stuff
- * Removed CONFIG_ETRAX_SERIAL_FLUSH_DMA_FAST
- *
- * Revision 1.6  2002/11/21 07:17:46  starvik
- * Change static inline to extern inline where otherwise outlined with gcc-3.2
- *
- * Revision 1.5  2002/11/14 15:59:49  starvik
- * Linux 2.5 port of the latest serial driver from 2.4. The work queue stuff
- * probably doesn't work yet.
- *
- * Revision 1.42  2002/11/05 09:08:47  johana
- * Better implementation of rs_stop() and rs_start() that uses the XOFF
- * register to start/stop transmission.
- * change_speed() also initilises XOFF register correctly so that
- * auto_xoff is enabled when IXON flag is set by user.
- * This gives fast XOFF response times.
- *
- * Revision 1.41  2002/11/04 18:40:57  johana
- * Implemented rs_stop() and rs_start().
- * Simple tests using hwtestserial indicates that this should be enough
- * to make it work.
- *
- * Revision 1.40  2002/10/14 05:33:18  starvik
- * RS-485 uses fast timers even if SERIAL_FAST_TIMER is disabled
- *
- * Revision 1.39  2002/09/30 21:00:57  johana
- * Support for CONFIG_ETRAX_SERx_DTR_RI_DSR_CD_MIXED where the status and
- * control pins can be mixed between PA and PB.
- * If no serial port uses MIXED old solution is used
- * (saves a few bytes and cycles).
- * control_pins struct uses masks instead of bit numbers.
- * Corrected dummy values and polarity in line_info() so
- * /proc/tty/driver/serial is now correct.
- * (the E100_xxx_GET() macros is really active low - perhaps not obvious)
- *
- * Revision 1.38  2002/08/23 11:01:36  starvik
- * Check that serial port is enabled in all interrupt handlers to avoid
- * restarts of DMA channels not assigned to serial ports
- *
- * Revision 1.37  2002/08/13 13:02:37  bjornw
- * Removed some warnings because of unused code
- *
- * Revision 1.36  2002/08/08 12:50:01  starvik
- * Serial interrupt is shared with synchronous serial port driver
- *
- * Revision 1.35  2002/06/03 10:40:49  starvik
- * Increased RS-485 RTS toggle timer to 2 characters
- *
- * Revision 1.34  2002/05/28 18:59:36  johana
- * Whitespace and comment fixing to be more like etrax100ser.c 1.71.
- *
- * Revision 1.33  2002/05/28 17:55:43  johana
- * RS-485 uses FAST_TIMER if enabled, and starts a short (one char time)
- * timer from tranismit_chars (interrupt context).
- * The timer toggles RTS in interrupt context when expired giving minimum
- * latencies.
- *
- * Revision 1.32  2002/05/22 13:58:00  johana
- * Renamed rs_write() to raw_write() and made it inline.
- * New rs_write() handles RS-485 if configured and enabled
- * (moved code from e100_write_rs485()).
- * RS-485 ioctl's uses copy_from_user() instead of verify_area().
- *
- * Revision 1.31  2002/04/22 11:20:03  johana
- * Updated copyright years.
- *
- * Revision 1.30  2002/04/22 09:39:12  johana
- * RS-485 support compiles.
- *
- * Revision 1.29  2002/01/14 16:10:01  pkj
- * Allocate the receive buffers dynamically. The static 4kB buffer was
- * too small for the peaks. This means that we can get rid of the extra
- * buffer and the copying to it. It also means we require less memory
- * under normal operations, but can use more when needed (there is a
- * cap at 64kB for safety reasons). If there is no memory available
- * we panic(), and die a horrible death...
- *
- * Revision 1.28  2001/12/18 15:04:53  johana
- * Cleaned up write_rs485() - now it works correctly without padding extra
- * char.
- * Added sane default initialisation of rs485.
- * Added #ifdef around dummy variables.
- *
- * Revision 1.27  2001/11/29 17:00:41  pkj
- * 2kB seems to be too small a buffer when using 921600 bps,
- * so increase it to 4kB (this was already done for the elinux
- * version of the serial driver).
- *
- * Revision 1.26  2001/11/19 14:20:41  pkj
- * Minor changes to comments and unused code.
- *
- * Revision 1.25  2001/11/12 20:03:43  pkj
- * Fixed compiler warnings.
- *
- * Revision 1.24  2001/11/12 15:10:05  pkj
- * Total redesign of the receiving part of the serial driver.
- * Uses eight chained descriptors to write to a 4kB buffer.
- * This data is then serialised into a 2kB buffer. From there it
- * is copied into the TTY's flip buffers when they become available.
- * A lot of copying, and the sizes of the buffers might need to be
- * tweaked, but all in all it should work better than the previous
- * version, without the need to modify the TTY code in any way.
- * Also note that erroneous bytes are now correctly marked in the
- * flag buffers (instead of always marking the first byte).
- *
- * Revision 1.23  2001/10/30 17:53:26  pkj
- * * Set info->uses_dma to 0 when a port is closed.
- * * Mark the timer1 interrupt as a fast one (SA_INTERRUPT).
- * * Call start_flush_timer() in start_receive() if
- *   CONFIG_ETRAX_SERIAL_FLUSH_DMA_FAST is defined.
- *
- * Revision 1.22  2001/10/30 17:44:03  pkj
- * Use %lu for received and transmitted counters in line_info().
- *
- * Revision 1.21  2001/10/30 17:40:34  pkj
- * Clean-up. The only change to functionality is that
- * CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS(=5) is used instead of
- * MAX_FLUSH_TIME(=8).
- *
- * Revision 1.20  2001/10/30 15:24:49  johana
- * Added char_time stuff from 2.0 driver.
- *
- * Revision 1.19  2001/10/30 15:23:03  johana
- * Merged with 1.13.2 branch + fixed indentation
- * and changed CONFIG_ETRAX100_XYS to CONFIG_ETRAX_XYZ
- *
- * Revision 1.18  2001/09/24 09:27:22  pkj
- * Completed ext_baud_table[] in cflag_to_baud() and cflag_to_etrax_baud().
- *
- * Revision 1.17  2001/08/24 11:32:49  ronny
- * More fixes for the CONFIG_ETRAX_SERIAL_PORT0 define.
- *
- * Revision 1.16  2001/08/24 07:56:22  ronny
- * Added config ifdefs around ser0 irq requests.
- *
- * Revision 1.15  2001/08/16 09:10:31  bjarne
- * serial.c - corrected the initialization of rs_table, the wrong defines
- *            where used.
- *            Corrected a test in timed_flush_handler.
- *            Changed configured to enabled.
- * serial.h - Changed configured to enabled.
- *
- * Revision 1.14  2001/08/15 07:31:23  bjarne
- * Introduced two new members to the e100_serial struct.
- * configured - Will be set to 1 if the port has been configured in .config
- * uses_dma   - Should be set to 1 if the port uses DMA. Currently it is set
- *              to 1
- *              when a port is opened. This is used to limit the DMA interrupt
- *              routines to only manipulate DMA channels actually used by the
- *              serial driver.
- *
- * Revision 1.13.2.2  2001/10/17 13:57:13  starvik
- * Receiver was broken by the break fixes
- *
- * Revision 1.13.2.1  2001/07/20 13:57:39  ronny
- * Merge with new stuff from etrax100ser.c. Works but haven't checked stuff
- * like break handling.
- *
- * Revision 1.13  2001/05/09 12:40:31  johana
- * Use DMA_NBR and IRQ_NBR defines from dma.h and irq.h
- *
- * Revision 1.12  2001/04/19 12:23:07  bjornw
- * CONFIG_RS485 -> CONFIG_ETRAX_RS485
- *
- * Revision 1.11  2001/04/05 14:29:48  markusl
- * Updated according to review remarks i.e.
- * -Use correct types in port structure to avoid compiler warnings
- * -Try to use IO_* macros whenever possible
- * -Open should never return -EBUSY
- *
- * Revision 1.10  2001/03/05 13:14:07  bjornw
- * Another spelling fix
- *
- * Revision 1.9  2001/02/23 13:46:38  bjornw
- * Spellling check
- *
- * Revision 1.8  2001/01/23 14:56:35  markusl
- * Made use of ser1 optional
- * Needed by USB
- *
- * Revision 1.7  2001/01/19 16:14:48  perf
- * Added kernel options for serial ports 234.
- * Changed option names from CONFIG_ETRAX100_XYZ to CONFIG_ETRAX_XYZ.
- *
- * Revision 1.6  2000/11/22 16:36:09  bjornw
- * Please marketing by using the correct case when spelling Etrax.
- *
- * Revision 1.5  2000/11/21 16:43:37  bjornw
- * Fixed so it compiles under CONFIG_SVINTO_SIM
- *
- * Revision 1.4  2000/11/15 17:34:12  bjornw
- * Added a timeout timer for flushing input channels. The interrupt-based
- * fast flush system should be easy to merge with this later (works the same
- * way, only with an irq instead of a system timer_list)
- *
- * Revision 1.3  2000/11/13 17:19:57  bjornw
- * * Incredibly, this almost complete rewrite of serial.c worked (at least
- *   for output) the first time.
- *
- *   Items worth noticing:
- *
- *      No Etrax100 port 1 workarounds (does only compile on 2.4 anyway now)
- *      RS485 is not ported (why can't it be done in userspace as on x86 ?)
- *      Statistics done through async_icount - if any more stats are needed,
- *      that's the place to put them or in an arch-dep version of it.
- *      timeout_interrupt and the other fast timeout stuff not ported yet
- *      There be dragons in this 3k+ line driver
- *
- * Revision 1.2  2000/11/10 16:50:28  bjornw
- * First shot at a 2.4 port, does not compile totally yet
- *
- * Revision 1.1  2000/11/10 16:47:32  bjornw
- * Added verbatim copy of rev 1.49 etrax100ser.c from elinux
- *
- * Revision 1.49  2000/10/30 15:47:14  tobiasa
- * Changed version number.
- *
- * Revision 1.48  2000/10/25 11:02:43  johana
- * Changed %ul to %lu in printf's
- *
- * Revision 1.47  2000/10/18 15:06:53  pkj
- * Compile correctly with CONFIG_ETRAX_SERIAL_FLUSH_DMA_FAST and
- * CONFIG_ETRAX_SERIAL_PROC_ENTRY together.
- * Some clean-up of the /proc/serial file.
- *
- * Revision 1.46  2000/10/16 12:59:40  johana
- * Added CONFIG_ETRAX_SERIAL_PROC_ENTRY for statistics and debug info.
- *
- * Revision 1.45  2000/10/13 17:10:59  pkj
- * Do not flush DMAs while flipping TTY buffers.
- *
- * Revision 1.44  2000/10/13 16:34:29  pkj
- * Added a delay in ser_interrupt() for 2.3ms when an error is detected.
- * We do not know why this delay is required yet, but without it the
- * irmaflash program does not work (this was the program that needed
- * the ser_interrupt() to be needed in the first place). This should not
- * affect normal use of the serial ports.
- *
- * Revision 1.43  2000/10/13 16:30:44  pkj
- * New version of the fast flush of serial buffers code. This time
- * it is localized to the serial driver and uses a fast timer to
- * do the work.
- *
- * Revision 1.42  2000/10/13 14:54:26  bennyo
- * Fix for switching RTS when using rs485
- *
- * Revision 1.41  2000/10/12 11:43:44  pkj
- * Cleaned up a number of comments.
- *
- * Revision 1.40  2000/10/10 11:58:39  johana
- * Made RS485 support generic for all ports.
- * Toggle rts in interrupt if no delay wanted.
- * WARNING: No true transmitter empty check??
- * Set d_wait bit when sending data so interrupt is delayed until
- * fifo flushed. (Fix tcdrain() problem)
- *
- * Revision 1.39  2000/10/04 16:08:02  bjornw
- * * Use virt_to_phys etc. for DMA addresses
- * * Removed CONFIG_FLUSH_DMA_FAST hacks
- * * Indentation fix
- *
- * Revision 1.38  2000/10/02 12:27:10  mattias
- * * added variable used when using fast flush on serial dma.
- *   (CONFIG_FLUSH_DMA_FAST)
- *
- * Revision 1.37  2000/09/27 09:44:24  pkj
- * Uncomment definition of SERIAL_HANDLE_EARLY_ERRORS.
- *
- * Revision 1.36  2000/09/20 13:12:52  johana
- * Support for CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS:
- *   Number of timer ticks between flush of receive fifo (1 tick = 10ms).
- *   Try 0-3 for low latency applications. Approx 5 for high load
- *   applications (e.g. PPP). Maybe this should be more adaptive some day...
- *
- * Revision 1.35  2000/09/20 10:36:08  johana
- * Typo in get_lsr_info()
- *
- * Revision 1.34  2000/09/20 10:29:59  johana
- * Let rs_chars_in_buffer() check fifo content as well.
- * get_lsr_info() might work now (not tested).
- * Easier to change the port to debug.
- *
- * Revision 1.33  2000/09/13 07:52:11  torbjore
- * Support RS485
- *
- * Revision 1.32  2000/08/31 14:45:37  bjornw
- * After sending a break we need to reset the transmit DMA channel
- *
- * Revision 1.31  2000/06/21 12:13:29  johana
- * Fixed wait for all chars sent when closing port.
- * (Used to always take 1 second!)
- * Added shadows for directions of status/ctrl signals.
- *
- * Revision 1.30  2000/05/29 16:27:55  bjornw
- * Simulator ifdef moved a bit
- *
- * Revision 1.29  2000/05/09 09:40:30  mattias
- * * Added description of dma registers used in timeout_interrupt
- * * Removed old code
- *
- * Revision 1.28  2000/05/08 16:38:58  mattias
- * * Bugfix for flushing fifo in timeout_interrupt
- *   Problem occurs when bluetooth stack waits for a small number of bytes
- *   containing an event acknowledging free buffers in bluetooth HW
- *   As before, data was stuck in fifo until more data came on uart and
- *   flushed it up to the stack.
- *
- * Revision 1.27  2000/05/02 09:52:28  jonasd
- * Added fix for peculiar etrax behaviour when eop is forced on an empty
- * fifo. This is used when flashing the IRMA chip. Disabled by default.
- *
- * Revision 1.26  2000/03/29 15:32:02  bjornw
- * 2.0.34 updates
- *
- * Revision 1.25  2000/02/16 16:59:36  bjornw
- * * Receive DMA directly into the flip-buffer, eliminating an intermediary
- *   receive buffer and a memcpy. Will avoid some overruns.
- * * Error message on debug port if an overrun or flip buffer overrun occurs.
- * * Just use the first byte in the flag flip buffer for errors.
- * * Check for timeout on the serial ports only each 5/100 s, not 1/100.
- *
- * Revision 1.24  2000/02/09 18:02:28  bjornw
- * * Clear serial errors (overrun, framing, parity) correctly. Before, the
- *   receiver would get stuck if an error occurred and we did not restart
- *   the input DMA.
- * * Cosmetics (indentation, some code made into inlines)
- * * Some more debug options
- * * Actually shut down the serial port (DMA irq, DMA reset, receiver stop)
- *   when the last open is closed. Corresponding fixes in startup().
- * * rs_close() "tx FIFO wait" code moved into right place, bug & -> && fixed
- *   and make a special case out of port 1 (R_DMA_CHx_STATUS is broken for that)
- * * e100_disable_rx/enable_rx just disables/enables the receiver, not RTS
- *
- * Revision 1.23  2000/01/24 17:46:19  johana
- * Wait for flush of DMA/FIFO when closing port.
- *
- * Revision 1.22  2000/01/20 18:10:23  johana
- * Added TIOCMGET ioctl to return modem status.
- * Implemented modem status/control that works with the extra signals
- * (DTR, DSR, RI,CD) as well.
- * 3 different modes supported:
- * ser0 on PB (Bundy), ser1 on PB (Lisa) and ser2 on PA (Bundy)
- * Fixed DEF_TX value that caused the serial transmitter pin (txd) to go to 0 when
- * closing the last filehandle, NASTY!.
- * Added break generation, not tested though!
- * Use IRQF_SHARED when request_irq() for ser2 and ser3 (shared with) par0 and par1.
- * You can't use them at the same time (yet..), but you can hopefully switch
- * between ser2/par0, ser3/par1 with the same kernel config.
- * Replaced some magic constants with defines
- *
- *
  */
 
 static char *serial_version = "$Revision: 1.25 $";
@@ -446,6 +30,7 @@ static char *serial_version = "$Revision: 1.25 $";
 
 #include <asm/io.h>
 #include <asm/irq.h>
+#include <asm/dma.h>
 #include <asm/system.h>
 #include <linux/delay.h>
 
@@ -454,8 +39,9 @@ static char *serial_version = "$Revision: 1.25 $";
 /* non-arch dependent serial structures are in linux/serial.h */
 #include <linux/serial.h>
 /* while we keep our own stuff (struct e100_serial) in a local .h file */
-#include "serial.h"
+#include "crisv10.h"
 #include <asm/fasttimer.h>
+#include <asm/arch/io_interface_mux.h>
 
 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
 #ifndef CONFIG_ETRAX_FAST_TIMER
@@ -504,18 +90,6 @@ struct tty_driver *serial_driver;
    from eLinux */
 #define SERIAL_HANDLE_EARLY_ERRORS
 
-/* Defined and used in n_tty.c, but we need it here as well */
-#define TTY_THRESHOLD_THROTTLE 128
-
-/* Due to buffersizes and threshold values, our SERIAL_DESCR_BUF_SIZE
- * must not be to high or flow control won't work if we leave it to the tty
- * layer so we have our own throttling in flush_to_flip
- * TTY_FLIPBUF_SIZE=512,
- * TTY_THRESHOLD_THROTTLE/UNTHROTTLE=128
- * BUF_SIZE can't be > 128
- */
-#define CRIS_BUF_SIZE	512
-
 /* Currently 16 descriptors x 128 bytes = 2048 bytes */
 #define SERIAL_DESCR_BUF_SIZE 256
 
@@ -588,13 +162,13 @@ unsigned long timer_data_to_ns(unsigned long timer_data);
 static void change_speed(struct e100_serial *info);
 static void rs_throttle(struct tty_struct * tty);
 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
-static int rs_write(struct tty_struct * tty, int from_user,
-                    const unsigned char *buf, int count);
+static int rs_write(struct tty_struct *tty,
+		const unsigned char *buf, int count);
 #ifdef CONFIG_ETRAX_RS485
-static int e100_write_rs485(struct tty_struct * tty, int from_user,
-                            const unsigned char *buf, int count);
+static int e100_write_rs485(struct tty_struct *tty,
+		const unsigned char *buf, int count);
 #endif
-static int get_lsr_info(struct e100_serial * info, unsigned int *value);
+static int get_lsr_info(struct e100_serial *info, unsigned int *value);
 
 
 #define DEF_BAUD 115200   /* 115.2 kbit/s */
@@ -679,20 +253,39 @@ static struct e100_serial rs_table[] = {
 	  .rx_ctrl     = DEF_RX,
 	  .tx_ctrl     = DEF_TX,
 	  .iseteop     = 2,
+	  .dma_owner   = dma_ser0,
+	  .io_if       = if_serial_0,
 #ifdef CONFIG_ETRAX_SERIAL_PORT0
           .enabled  = 1,
 #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT
 	  .dma_out_enabled = 1,
+	  .dma_out_nbr = SER0_TX_DMA_NBR,
+	  .dma_out_irq_nbr = SER0_DMA_TX_IRQ_NBR,
+	  .dma_out_irq_flags = IRQF_DISABLED,
+	  .dma_out_irq_description = "serial 0 dma tr",
 #else
 	  .dma_out_enabled = 0,
+	  .dma_out_nbr = UINT_MAX,
+	  .dma_out_irq_nbr = 0,
+	  .dma_out_irq_flags = 0,
+	  .dma_out_irq_description = NULL,
 #endif
 #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN
 	  .dma_in_enabled = 1,
+	  .dma_in_nbr = SER0_RX_DMA_NBR,
+	  .dma_in_irq_nbr = SER0_DMA_RX_IRQ_NBR,
+	  .dma_in_irq_flags = IRQF_DISABLED,
+	  .dma_in_irq_description = "serial 0 dma rec",
 #else
-	  .dma_in_enabled = 0
+	  .dma_in_enabled = 0,
+	  .dma_in_nbr = UINT_MAX,
+	  .dma_in_irq_nbr = 0,
+	  .dma_in_irq_flags = 0,
+	  .dma_in_irq_description = NULL,
 #endif
 #else
           .enabled  = 0,
+	  .io_if_description = NULL,
 	  .dma_out_enabled = 0,
 	  .dma_in_enabled = 0
 #endif
@@ -714,20 +307,42 @@ static struct e100_serial rs_table[] = {
 	  .rx_ctrl     = DEF_RX,
 	  .tx_ctrl     = DEF_TX,
 	  .iseteop     = 3,
+	  .dma_owner   = dma_ser1,
+	  .io_if       = if_serial_1,
 #ifdef CONFIG_ETRAX_SERIAL_PORT1
           .enabled  = 1,
+	  .io_if_description = "ser1",
 #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT
 	  .dma_out_enabled = 1,
+	  .dma_out_nbr = SER1_TX_DMA_NBR,
+	  .dma_out_irq_nbr = SER1_DMA_TX_IRQ_NBR,
+	  .dma_out_irq_flags = IRQF_DISABLED,
+	  .dma_out_irq_description = "serial 1 dma tr",
 #else
 	  .dma_out_enabled = 0,
+	  .dma_out_nbr = UINT_MAX,
+	  .dma_out_irq_nbr = 0,
+	  .dma_out_irq_flags = 0,
+	  .dma_out_irq_description = NULL,
 #endif
 #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN
 	  .dma_in_enabled = 1,
+	  .dma_in_nbr = SER1_RX_DMA_NBR,
+	  .dma_in_irq_nbr = SER1_DMA_RX_IRQ_NBR,
+	  .dma_in_irq_flags = IRQF_DISABLED,
+	  .dma_in_irq_description = "serial 1 dma rec",
 #else
-	  .dma_in_enabled = 0
+	  .dma_in_enabled = 0,
+	  .dma_in_enabled = 0,
+	  .dma_in_nbr = UINT_MAX,
+	  .dma_in_irq_nbr = 0,
+	  .dma_in_irq_flags = 0,
+	  .dma_in_irq_description = NULL,
 #endif
 #else
           .enabled  = 0,
+	  .io_if_description = NULL,
+	  .dma_in_irq_nbr = 0,
 	  .dma_out_enabled = 0,
 	  .dma_in_enabled = 0
 #endif
@@ -748,20 +363,40 @@ static struct e100_serial rs_table[] = {
 	  .rx_ctrl     = DEF_RX,
 	  .tx_ctrl     = DEF_TX,
 	  .iseteop     = 0,
+	  .dma_owner   = dma_ser2,
+	  .io_if       = if_serial_2,
 #ifdef CONFIG_ETRAX_SERIAL_PORT2
           .enabled  = 1,
+	  .io_if_description = "ser2",
 #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT
 	  .dma_out_enabled = 1,
+	  .dma_out_nbr = SER2_TX_DMA_NBR,
+	  .dma_out_irq_nbr = SER2_DMA_TX_IRQ_NBR,
+	  .dma_out_irq_flags = IRQF_DISABLED,
+	  .dma_out_irq_description = "serial 2 dma tr",
 #else
 	  .dma_out_enabled = 0,
+	  .dma_out_nbr = UINT_MAX,
+	  .dma_out_irq_nbr = 0,
+	  .dma_out_irq_flags = 0,
+	  .dma_out_irq_description = NULL,
 #endif
 #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN
 	  .dma_in_enabled = 1,
+	  .dma_in_nbr = SER2_RX_DMA_NBR,
+	  .dma_in_irq_nbr = SER2_DMA_RX_IRQ_NBR,
+	  .dma_in_irq_flags = IRQF_DISABLED,
+	  .dma_in_irq_description = "serial 2 dma rec",
 #else
-	  .dma_in_enabled = 0
+	  .dma_in_enabled = 0,
+	  .dma_in_nbr = UINT_MAX,
+	  .dma_in_irq_nbr = 0,
+	  .dma_in_irq_flags = 0,
+	  .dma_in_irq_description = NULL,
 #endif
 #else
           .enabled  = 0,
+	  .io_if_description = NULL,
 	  .dma_out_enabled = 0,
 	  .dma_in_enabled = 0
 #endif
@@ -782,20 +417,40 @@ static struct e100_serial rs_table[] = {
 	  .rx_ctrl     = DEF_RX,
 	  .tx_ctrl     = DEF_TX,
 	  .iseteop     = 1,
+	  .dma_owner   = dma_ser3,
+	  .io_if       = if_serial_3,
 #ifdef CONFIG_ETRAX_SERIAL_PORT3
           .enabled  = 1,
+	  .io_if_description = "ser3",
 #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT
 	  .dma_out_enabled = 1,
+	  .dma_out_nbr = SER3_TX_DMA_NBR,
+	  .dma_out_irq_nbr = SER3_DMA_TX_IRQ_NBR,
+	  .dma_out_irq_flags = IRQF_DISABLED,
+	  .dma_out_irq_description = "serial 3 dma tr",
 #else
 	  .dma_out_enabled = 0,
+	  .dma_out_nbr = UINT_MAX,
+	  .dma_out_irq_nbr = 0,
+	  .dma_out_irq_flags = 0,
+	  .dma_out_irq_description = NULL,
 #endif
 #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN
 	  .dma_in_enabled = 1,
+	  .dma_in_nbr = SER3_RX_DMA_NBR,
+	  .dma_in_irq_nbr = SER3_DMA_RX_IRQ_NBR,
+	  .dma_in_irq_flags = IRQF_DISABLED,
+	  .dma_in_irq_description = "serial 3 dma rec",
 #else
-	  .dma_in_enabled = 0
+	  .dma_in_enabled = 0,
+	  .dma_in_nbr = UINT_MAX,
+	  .dma_in_irq_nbr = 0,
+	  .dma_in_irq_flags = 0,
+	  .dma_in_irq_description = NULL
 #endif
 #else
           .enabled  = 0,
+	  .io_if_description = NULL,
 	  .dma_out_enabled = 0,
 	  .dma_in_enabled = 0
 #endif
@@ -1416,12 +1071,11 @@ e100_dtr(struct e100_serial *info, int set)
 	{
 		unsigned long flags;
 
-		save_flags(flags);
-		cli();
+		local_irq_save(flags);
 		*e100_modem_pins[info->line].dtr_shadow &= ~mask;
 		*e100_modem_pins[info->line].dtr_shadow |= (set ? 0 : mask);
 		*e100_modem_pins[info->line].dtr_port = *e100_modem_pins[info->line].dtr_shadow;
-		restore_flags(flags);
+		local_irq_restore(flags);
 	}
 
 #ifdef SERIAL_DEBUG_IO
@@ -1440,12 +1094,11 @@ e100_rts(struct e100_serial *info, int set)
 {
 #ifndef CONFIG_SVINTO_SIM
 	unsigned long flags;
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
 	info->rx_ctrl &= ~E100_RTS_MASK;
 	info->rx_ctrl |= (set ? 0 : E100_RTS_MASK);  /* RTS is active low */
 	info->port[REG_REC_CTRL] = info->rx_ctrl;
-	restore_flags(flags);
+	local_irq_restore(flags);
 #ifdef SERIAL_DEBUG_IO
 	printk("ser%i rts %i\n", info->line, set);
 #endif
@@ -1463,12 +1116,11 @@ e100_ri_out(struct e100_serial *info, int set)
 		unsigned char mask = e100_modem_pins[info->line].ri_mask;
 		unsigned long flags;
 
-		save_flags(flags);
-		cli();
+		local_irq_save(flags);
 		*e100_modem_pins[info->line].ri_shadow &= ~mask;
 		*e100_modem_pins[info->line].ri_shadow |= (set ? 0 : mask);
 		*e100_modem_pins[info->line].ri_port = *e100_modem_pins[info->line].ri_shadow;
-		restore_flags(flags);
+		local_irq_restore(flags);
 	}
 #endif
 }
@@ -1481,12 +1133,11 @@ e100_cd_out(struct e100_serial *info, int set)
 		unsigned char mask = e100_modem_pins[info->line].cd_mask;
 		unsigned long flags;
 
-		save_flags(flags);
-		cli();
+		local_irq_save(flags);
 		*e100_modem_pins[info->line].cd_shadow &= ~mask;
 		*e100_modem_pins[info->line].cd_shadow |= (set ? 0 : mask);
 		*e100_modem_pins[info->line].cd_port = *e100_modem_pins[info->line].cd_shadow;
-		restore_flags(flags);
+		local_irq_restore(flags);
 	}
 #endif
 }
@@ -1560,8 +1211,7 @@ static void e100_disable_txdma_channel(struct e100_serial *info)
 	/* Disable output DMA channel for the serial port in question
 	 * ( set to something other then serialX)
 	 */
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
 	DFLOW(DEBUG_LOG(info->line, "disable_txdma_channel %i\n", info->line));
 	if (info->line == 0) {
 		if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma6)) ==
@@ -1589,7 +1239,7 @@ static void e100_disable_txdma_channel(struct e100_serial *info)
 		}
 	}
 	*R_GEN_CONFIG = genconfig_shadow;
-	restore_flags(flags);
+	local_irq_restore(flags);
 }
 
 
@@ -1597,8 +1247,7 @@ static void e100_enable_txdma_channel(struct e100_serial *info)
 {
 	unsigned long flags;
 
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
 	DFLOW(DEBUG_LOG(info->line, "enable_txdma_channel %i\n", info->line));
 	/* Enable output DMA channel for the serial port in question */
 	if (info->line == 0) {
@@ -1615,7 +1264,7 @@ static void e100_enable_txdma_channel(struct e100_serial *info)
 		genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, serial3);
 	}
 	*R_GEN_CONFIG = genconfig_shadow;
-	restore_flags(flags);
+	local_irq_restore(flags);
 }
 
 static void e100_disable_rxdma_channel(struct e100_serial *info)
@@ -1625,8 +1274,7 @@ static void e100_disable_rxdma_channel(struct e100_serial *info)
 	/* Disable input DMA channel for the serial port in question
 	 * ( set to something other then serialX)
 	 */
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
 	if (info->line == 0) {
 		if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma7)) ==
 		    IO_STATE(R_GEN_CONFIG, dma7, serial0)) {
@@ -1653,7 +1301,7 @@ static void e100_disable_rxdma_channel(struct e100_serial *info)
 		}
 	}
 	*R_GEN_CONFIG = genconfig_shadow;
-	restore_flags(flags);
+	local_irq_restore(flags);
 }
 
 
@@ -1661,8 +1309,7 @@ static void e100_enable_rxdma_channel(struct e100_serial *info)
 {
 	unsigned long flags;
 
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
 	/* Enable input DMA channel for the serial port in question */
 	if (info->line == 0) {
 		genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma7);
@@ -1678,7 +1325,7 @@ static void e100_enable_rxdma_channel(struct e100_serial *info)
 		genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, serial3);
 	}
 	*R_GEN_CONFIG = genconfig_shadow;
-	restore_flags(flags);
+	local_irq_restore(flags);
 }
 
 #ifdef SERIAL_HANDLE_EARLY_ERRORS
@@ -1785,7 +1432,7 @@ e100_enable_rs485(struct tty_struct *tty,struct rs485_control *r)
 }
 
 static int
-e100_write_rs485(struct tty_struct *tty, int from_user,
+e100_write_rs485(struct tty_struct *tty,
                  const unsigned char *buf, int count)
 {
 	struct e100_serial * info = (struct e100_serial *)tty->driver_data;
@@ -1798,7 +1445,7 @@ e100_write_rs485(struct tty_struct *tty, int from_user,
 	 */
 	info->rs485.enabled = 1;
 	/* rs_write now deals with RS485 if enabled */
-	count = rs_write(tty, from_user, buf, count);
+	count = rs_write(tty, buf, count);
 	info->rs485.enabled = old_enabled;
 	return count;
 }
@@ -1836,7 +1483,7 @@ rs_stop(struct tty_struct *tty)
 		unsigned long flags;
 		unsigned long xoff;
 
-		save_flags(flags); cli();
+		local_irq_save(flags);
 		DFLOW(DEBUG_LOG(info->line, "XOFF rs_stop xmit %i\n",
 				CIRC_CNT(info->xmit.head,
 					 info->xmit.tail,SERIAL_XMIT_SIZE)));
@@ -1848,7 +1495,7 @@ rs_stop(struct tty_struct *tty)
 		}
 
 		*((unsigned long *)&info->port[REG_XOFF]) = xoff;
-		restore_flags(flags);
+		local_irq_restore(flags);
 	}
 }
 
@@ -1860,7 +1507,7 @@ rs_start(struct tty_struct *tty)
 		unsigned long flags;
 		unsigned long xoff;
 
-		save_flags(flags); cli();
+		local_irq_save(flags);
 		DFLOW(DEBUG_LOG(info->line, "XOFF rs_start xmit %i\n",
 				CIRC_CNT(info->xmit.head,
 					 info->xmit.tail,SERIAL_XMIT_SIZE)));
@@ -1875,7 +1522,7 @@ rs_start(struct tty_struct *tty)
 		    info->xmit.head != info->xmit.tail && info->xmit.buf)
 			e100_enable_serial_tx_ready_irq(info);
 
-		restore_flags(flags);
+		local_irq_restore(flags);
 	}
 }
 
@@ -2055,8 +1702,7 @@ static int serial_fast_timer_expired = 0;
 static void flush_timeout_function(unsigned long data);
 #define START_FLUSH_FAST_TIMER_TIME(info, string, usec) {\
   unsigned long timer_flags; \
-  save_flags(timer_flags); \
-  cli(); \
+  local_irq_save(timer_flags); \
   if (fast_timers[info->line].function == NULL) { \
     serial_fast_timer_started++; \
     TIMERD(DEBUG_LOG(info->line, "start_timer %i ", info->line)); \
@@ -2070,7 +1716,7 @@ static void flush_timeout_function(unsigned long data);
   else { \
     TIMERD(DEBUG_LOG(info->line, "timer %i already running\n", info->line)); \
   } \
-  restore_flags(timer_flags); \
+  local_irq_restore(timer_flags); \
 }
 #define START_FLUSH_FAST_TIMER(info, string) START_FLUSH_FAST_TIMER_TIME(info, string, info->flush_time_usec)
 
@@ -2099,8 +1745,7 @@ append_recv_buffer(struct e100_serial *info, struct etrax_recv_buffer *buffer)
 {
 	unsigned long flags;
 
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
 
 	if (!info->first_recv_buffer)
 		info->first_recv_buffer = buffer;
@@ -2113,7 +1758,7 @@ append_recv_buffer(struct e100_serial *info, struct etrax_recv_buffer *buffer)
 	if (info->recv_cnt > info->max_recv_cnt)
 		info->max_recv_cnt = info->recv_cnt;
 
-	restore_flags(flags);
+	local_irq_restore(flags);
 }
 
 static int
@@ -2133,11 +1778,7 @@ add_char_and_flag(struct e100_serial *info, unsigned char data, unsigned char fl
 		info->icount.rx++;
 	} else {
 		struct tty_struct *tty = info->tty;
-		*tty->flip.char_buf_ptr = data;
-		*tty->flip.flag_buf_ptr = flag;
-		tty->flip.flag_buf_ptr++;
-		tty->flip.char_buf_ptr++;
-		tty->flip.count++;
+		tty_insert_flip_char(tty, data, flag);
 		info->icount.rx++;
 	}
 
@@ -2322,7 +1963,6 @@ start_receive(struct e100_serial *info)
 	 */
 	return;
 #endif
-	info->tty->flip.count = 0;
 	if (info->uses_dma_in) {
 		/* reset the input dma channel to be sure it works */
 
@@ -2484,32 +2124,20 @@ static void flush_to_flip_buffer(struct e100_serial *info)
 {
 	struct tty_struct *tty;
 	struct etrax_recv_buffer *buffer;
-	unsigned int length;
 	unsigned long flags;
-	int max_flip_size;
-
-	if (!info->first_recv_buffer)
-		return;
 
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
+	tty = info->tty;
 
-	if (!(tty = info->tty)) {
-		restore_flags(flags);
+	if (!tty) {
+		local_irq_restore(flags);
 		return;
 	}
 
 	while ((buffer = info->first_recv_buffer) != NULL) {
 		unsigned int count = buffer->length;
 
-		count = tty_buffer_request_room(tty, count);
-		if (count == 0) /* Throttle ?? */
-			break;
-
-		if (count > 1)
-			tty_insert_flip_strings(tty, buffer->buffer, count - 1);
-		tty_insert_flip_char(tty, buffer->buffer[count-1], buffer->error);
-
+		tty_insert_flip_string(tty, buffer->buffer, count);
 		info->recv_cnt -= count;
 
 		if (count == buffer->length) {
@@ -2525,18 +2153,9 @@ static void flush_to_flip_buffer(struct e100_serial *info)
 	if (!info->first_recv_buffer)
 		info->last_recv_buffer = NULL;
 
-	restore_flags(flags);
-
-	DFLIP(
-	  if (1) {
-		  DEBUG_LOG(info->line, "*** rxtot %i\n", info->icount.rx);
-		  DEBUG_LOG(info->line, "ldisc %lu\n", tty->ldisc.chars_in_buffer(tty));
-		  DEBUG_LOG(info->line, "room  %lu\n", tty->ldisc.receive_room(tty));
-	  }
+	local_irq_restore(flags);
 
-	);
-
-	/* this includes a check for low-latency */
+	/* This includes a check for low-latency */
 	tty_flip_buffer_push(tty);
 }
 
@@ -2679,21 +2298,7 @@ struct e100_serial * handle_ser_rx_interrupt_no_dma(struct e100_serial *info)
 		printk("!NO TTY!\n");
 		return info;
 	}
-	if (tty->flip.count >= CRIS_BUF_SIZE - TTY_THRESHOLD_THROTTLE) {
-		/* check TTY_THROTTLED first so it indicates our state */
-		if (!test_and_set_bit(TTY_THROTTLED, &tty->flags)) {
-			DFLOW(DEBUG_LOG(info->line, "rs_throttle flip.count: %i\n", tty->flip.count));
-			rs_throttle(tty);
-		}
-	}
-	if (tty->flip.count >= CRIS_BUF_SIZE) {
-		DEBUG_LOG(info->line, "force FLIP! %i\n", tty->flip.count);
-		tty->flip.work.func((void *) tty);
-		if (tty->flip.count >= CRIS_BUF_SIZE) {
-			DEBUG_LOG(info->line, "FLIP FULL! %i\n", tty->flip.count);
-			return info;		/* if TTY_DONT_FLIP is set */
-		}
-	}
+
 	/* Read data and status at the same time */
 	data_read = *((unsigned long *)&info->port[REG_DATA_STATUS32]);
 more_data:
@@ -2746,27 +2351,26 @@ more_data:
 				DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt);
 				info->errorcode = ERRCODE_INSERT_BREAK;
 			} else {
+				unsigned char data = IO_EXTRACT(R_SERIAL0_READ,
+					data_in, data_read);
+				char flag = TTY_NORMAL;
 				if (info->errorcode == ERRCODE_INSERT_BREAK) {
-					info->icount.brk++;
-					*tty->flip.char_buf_ptr = 0;
-					*tty->flip.flag_buf_ptr = TTY_BREAK;
-					tty->flip.flag_buf_ptr++;
-					tty->flip.char_buf_ptr++;
-					tty->flip.count++;
+					struct tty_struct *tty = info->tty;
+					tty_insert_flip_char(tty, 0, flag);
 					info->icount.rx++;
 				}
-				*tty->flip.char_buf_ptr = IO_EXTRACT(R_SERIAL0_READ, data_in, data_read);
 
 				if (data_read & IO_MASK(R_SERIAL0_READ, par_err)) {
 					info->icount.parity++;
-					*tty->flip.flag_buf_ptr = TTY_PARITY;
+					flag = TTY_PARITY;
 				} else if (data_read & IO_MASK(R_SERIAL0_READ, overrun)) {
 					info->icount.overrun++;
-					*tty->flip.flag_buf_ptr = TTY_OVERRUN;
+					flag = TTY_OVERRUN;
 				} else if (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) {
 					info->icount.frame++;
-					*tty->flip.flag_buf_ptr = TTY_FRAME;
+					flag = TTY_FRAME;
 				}
+				tty_insert_flip_char(tty, data, flag);
 				info->errorcode = 0;
 			}
 			info->break_detected_cnt = 0;
@@ -2782,16 +2386,14 @@ more_data:
 			log_int(rdpc(), 0, 0);
 		}
 		);
-		*tty->flip.char_buf_ptr = IO_EXTRACT(R_SERIAL0_READ, data_in, data_read);
-		*tty->flip.flag_buf_ptr = 0;
+		tty_insert_flip_char(tty,
+			IO_EXTRACT(R_SERIAL0_READ, data_in, data_read),
+			TTY_NORMAL);
 	} else {
 		DEBUG_LOG(info->line, "ser_rx int but no data_avail  %08lX\n", data_read);
 	}
 
 
-	tty->flip.flag_buf_ptr++;
-	tty->flip.char_buf_ptr++;
-	tty->flip.count++;
 	info->icount.rx++;
 	data_read = *((unsigned long *)&info->port[REG_DATA_STATUS32]);
 	if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) {
@@ -2929,7 +2531,7 @@ static void handle_ser_tx_interrupt(struct e100_serial *info)
 	if (info->x_char) {
 		unsigned char rstat;
 		DFLOW(DEBUG_LOG(info->line, "tx_int: xchar 0x%02X\n", info->x_char));
-		save_flags(flags); cli();
+		local_irq_save(flags);
 		rstat = info->port[REG_STATUS];
 		DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat));
 
@@ -2938,7 +2540,7 @@ static void handle_ser_tx_interrupt(struct e100_serial *info)
 		info->x_char = 0;
 		/* We must enable since it is disabled in ser_interrupt */
 		e100_enable_serial_tx_ready_irq(info);
-		restore_flags(flags);
+		local_irq_restore(flags);
 		return;
 	}
 	if (info->uses_dma_out) {
@@ -2946,7 +2548,7 @@ static void handle_ser_tx_interrupt(struct e100_serial *info)
 		int i;
 		/* We only use normal tx interrupt when sending x_char */
 		DFLOW(DEBUG_LOG(info->line, "tx_int: xchar sent\n", 0));
-		save_flags(flags); cli();
+		local_irq_save(flags);
 		rstat = info->port[REG_STATUS];
 		DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat));
 		e100_disable_serial_tx_ready_irq(info);
@@ -2959,7 +2561,7 @@ static void handle_ser_tx_interrupt(struct e100_serial *info)
 			nop();
 
 		*info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, continue);
-		restore_flags(flags);
+		local_irq_restore(flags);
 		return;
 	}
 	/* Normal char-by-char interrupt */
@@ -2973,7 +2575,7 @@ static void handle_ser_tx_interrupt(struct e100_serial *info)
 	}
 	DINTR2(DEBUG_LOG(info->line, "tx_int %c\n", info->xmit.buf[info->xmit.tail]));
 	/* Send a byte, rs485 timing is critical so turn of ints */
-	save_flags(flags); cli();
+	local_irq_save(flags);
 	info->port[REG_TR_DATA] = info->xmit.buf[info->xmit.tail];
 	info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1);
 	info->icount.tx++;
@@ -2997,7 +2599,7 @@ static void handle_ser_tx_interrupt(struct e100_serial *info)
 		/* We must enable since it is disabled in ser_interrupt */
 		e100_enable_serial_tx_ready_irq(info);
 	}
-	restore_flags(flags);
+	local_irq_restore(flags);
 
 	if (CIRC_CNT(info->xmit.head,
 		     info->xmit.tail,
@@ -3022,7 +2624,7 @@ ser_interrupt(int irq, void *dev_id)
 	int handled = 0;
 	static volatile unsigned long reentered_ready_mask = 0;
 
-	save_flags(flags); cli();
+	local_irq_save(flags);
 	irq_mask1_rd = *R_IRQ_MASK1_RD;
 	/* First handle all rx interrupts with ints disabled */
 	info = rs_table;
@@ -3067,7 +2669,7 @@ ser_interrupt(int irq, void *dev_id)
 			/* Unblock the serial interrupt */
 			*R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set);
 
-			sti();
+			local_irq_enable();
 			ready_mask = (1 << (8+1+2*0)); /* ser0 tr_ready */
 			info = rs_table;
 			for (i = 0; i < NR_PORTS; i++) {
@@ -3080,11 +2682,11 @@ ser_interrupt(int irq, void *dev_id)
 				ready_mask <<= 2;
 			}
 			/* handle_ser_tx_interrupt enables tr_ready interrupts */
-			cli();
+			local_irq_disable();
 			/* Handle reentered TX interrupt */
 			irq_mask1_rd = reentered_ready_mask;
 		}
-		cli();
+		local_irq_disable();
 		tx_started = 0;
 	} else {
 		unsigned long ready_mask;
@@ -3100,7 +2702,7 @@ ser_interrupt(int irq, void *dev_id)
 		}
 	}
 
-	restore_flags(flags);
+	local_irq_restore(flags);
 	return IRQ_RETVAL(handled);
 } /* ser_interrupt */
 #endif
@@ -3121,11 +2723,13 @@ ser_interrupt(int irq, void *dev_id)
  * them using rs_sched_event(), and they get done here.
  */
 static void
-do_softint(void *private_)
+do_softint(struct work_struct *work)
 {
-	struct e100_serial	*info = (struct e100_serial *) private_;
+	struct e100_serial	*info;
 	struct tty_struct	*tty;
 
+	info = container_of(work, struct e100_serial, work);
+
 	tty = info->tty;
 	if (!tty)
 		return;
@@ -3145,13 +2749,12 @@ startup(struct e100_serial * info)
 	if (!xmit_page)
 		return -ENOMEM;
 
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
 
 	/* if it was already initialized, skip this */
 
 	if (info->flags & ASYNC_INITIALIZED) {
-		restore_flags(flags);
+		local_irq_restore(flags);
 		free_page(xmit_page);
 		return 0;
 	}
@@ -3277,7 +2880,7 @@ startup(struct e100_serial * info)
 
 	info->flags |= ASYNC_INITIALIZED;
 
-	restore_flags(flags);
+	local_irq_restore(flags);
 	return 0;
 }
 
@@ -3328,8 +2931,7 @@ shutdown(struct e100_serial * info)
 	       info->irq);
 #endif
 
-	save_flags(flags);
-	cli(); /* Disable interrupts */
+	local_irq_save(flags);
 
 	if (info->xmit.buf) {
 		free_page((unsigned long)info->xmit.buf);
@@ -3353,7 +2955,7 @@ shutdown(struct e100_serial * info)
 		set_bit(TTY_IO_ERROR, &info->tty->flags);
 
 	info->flags &= ~ASYNC_INITIALIZED;
-	restore_flags(flags);
+	local_irq_restore(flags);
 }
 
 
@@ -3411,7 +3013,6 @@ change_speed(struct e100_serial *info)
 				DBAUD(printk("using external baudrate: %lu\n", CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8));
 				info->baud = CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8;
 			}
-		}
 #endif
 		else
 		{
@@ -3445,8 +3046,7 @@ change_speed(struct e100_serial *info)
 
 #ifndef CONFIG_SVINTO_SIM
 	/* start with default settings and then fill in changes */
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
 	/* 8 bit, no/even parity */
 	info->rx_ctrl &= ~(IO_MASK(R_SERIAL0_REC_CTRL, rec_bitnr) |
 			   IO_MASK(R_SERIAL0_REC_CTRL, rec_par_en) |
@@ -3510,7 +3110,7 @@ change_speed(struct e100_serial *info)
 	}
 
 	*((unsigned long *)&info->port[REG_XOFF]) = xoff;
-	restore_flags(flags);
+	local_irq_restore(flags);
 #endif /* !CONFIG_SVINTO_SIM */
 
 	update_char_time(info);
@@ -3538,13 +3138,12 @@ rs_flush_chars(struct tty_struct *tty)
 
 	/* this protection might not exactly be necessary here */
 
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
 	start_transmit(info);
-	restore_flags(flags);
+	local_irq_restore(flags);
 }
 
-static int rs_raw_write(struct tty_struct * tty, int from_user,
+static int rs_raw_write(struct tty_struct *tty,
 			const unsigned char *buf, int count)
 {
 	int	c, ret = 0;
@@ -3567,53 +3166,19 @@ static int rs_raw_write(struct tty_struct * tty, int from_user,
 	SIMCOUT(buf, count);
 	return count;
 #endif
-	save_flags(flags);
+	local_save_flags(flags);
 	DFLOW(DEBUG_LOG(info->line, "write count %i ", count));
 	DFLOW(DEBUG_LOG(info->line, "ldisc %i\n", tty->ldisc.chars_in_buffer(tty)));
 
 
-	/* the cli/restore_flags pairs below are needed because the
-	 * DMA interrupt handler moves the info->xmit values. the memcpy
-	 * needs to be in the critical region unfortunately, because we
-	 * need to read xmit values, memcpy, write xmit values in one
-	 * atomic operation... this could perhaps be avoided by more clever
-	 * design.
+	/* The local_irq_disable/restore_flags pairs below are needed
+	 * because the DMA interrupt handler moves the info->xmit values.
+	 * the memcpy needs to be in the critical region unfortunately,
+	 * because we need to read xmit values, memcpy, write xmit values
+	 * in one atomic operation... this could perhaps be avoided by
+	 * more clever design.
 	 */
-	if (from_user) {
-		mutex_lock(&tmp_buf_mutex);
-		while (1) {
-			int c1;
-			c = CIRC_SPACE_TO_END(info->xmit.head,
-					      info->xmit.tail,
-					      SERIAL_XMIT_SIZE);
-			if (count < c)
-				c = count;
-			if (c <= 0)
-				break;
-
-			c -= copy_from_user(tmp_buf, buf, c);
-			if (!c) {
-				if (!ret)
-					ret = -EFAULT;
-				break;
-			}
-			cli();
-			c1 = CIRC_SPACE_TO_END(info->xmit.head,
-					       info->xmit.tail,
-					       SERIAL_XMIT_SIZE);
-			if (c1 < c)
-				c = c1;
-			memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c);
-			info->xmit.head = ((info->xmit.head + c) &
-					   (SERIAL_XMIT_SIZE-1));
-			restore_flags(flags);
-			buf += c;
-			count -= c;
-			ret += c;
-		}
-		mutex_unlock(&tmp_buf_mutex);
-	} else {
-		cli();
+	local_irq_disable();
 		while (count) {
 			c = CIRC_SPACE_TO_END(info->xmit.head,
 					      info->xmit.tail,
@@ -3631,8 +3196,7 @@ static int rs_raw_write(struct tty_struct * tty, int from_user,
 			count -= c;
 			ret += c;
 		}
-		restore_flags(flags);
-	}
+	local_irq_restore(flags);
 
 	/* enable transmitter if not running, unless the tty is stopped
 	 * this does not need IRQ protection since if tr_running == 0
@@ -3651,7 +3215,7 @@ static int rs_raw_write(struct tty_struct * tty, int from_user,
 } /* raw_raw_write() */
 
 static int
-rs_write(struct tty_struct * tty, int from_user,
+rs_write(struct tty_struct *tty,
 	 const unsigned char *buf, int count)
 {
 #if defined(CONFIG_ETRAX_RS485)
@@ -3678,7 +3242,7 @@ rs_write(struct tty_struct * tty, int from_user,
 	}
 #endif /* CONFIG_ETRAX_RS485 */
 
-	count = rs_raw_write(tty, from_user, buf, count);
+	count = rs_raw_write(tty, buf, count);
 
 #if defined(CONFIG_ETRAX_RS485)
 	if (info->rs485.enabled)
@@ -3746,10 +3310,9 @@ rs_flush_buffer(struct tty_struct *tty)
 	struct e100_serial *info = (struct e100_serial *)tty->driver_data;
 	unsigned long flags;
 
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
 	info->xmit.head = info->xmit.tail = 0;
-	restore_flags(flags);
+	local_irq_restore(flags);
 
 	tty_wakeup(tty);
 }
@@ -3767,7 +3330,7 @@ static void rs_send_xchar(struct tty_struct *tty, char ch)
 {
 	struct e100_serial *info = (struct e100_serial *)tty->driver_data;
 	unsigned long flags;
-	save_flags(flags); cli();
+	local_irq_save(flags);
 	if (info->uses_dma_out) {
 		/* Put the DMA on hold and disable the channel */
 		*info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, hold);
@@ -3784,7 +3347,7 @@ static void rs_send_xchar(struct tty_struct *tty, char ch)
 	DFLOW(DEBUG_LOG(info->line, "rs_send_xchar 0x%02X\n", ch));
 	info->x_char = ch;
 	e100_enable_serial_tx_ready_irq(info);
-	restore_flags(flags);
+	local_irq_restore(flags);
 }
 
 /*
@@ -3996,21 +3559,61 @@ char *get_control_state_str(int MLines, char *s)
 }
 #endif
 
+static void
+rs_break(struct tty_struct *tty, int break_state)
+{
+	struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+	unsigned long flags;
+
+	if (!info->port)
+		return;
+
+	local_irq_save(flags);
+	if (break_state == -1) {
+		/* Go to manual mode and set the txd pin to 0 */
+		/* Clear bit 7 (txd) and 6 (tr_enable) */
+		info->tx_ctrl &= 0x3F;
+	} else {
+		/* Set bit 7 (txd) and 6 (tr_enable) */
+		info->tx_ctrl |= (0x80 | 0x40);
+	}
+	info->port[REG_TR_CTRL] = info->tx_ctrl;
+	local_irq_restore(flags);
+}
+
 static int
-get_modem_info(struct e100_serial * info, unsigned int *value)
+rs_tiocmset(struct tty_struct *tty, struct file *file,
+		unsigned int set, unsigned int clear)
 {
-	unsigned int result;
-	/* Polarity isn't verified */
-#if 0 /*def SERIAL_DEBUG_IO  */
+	struct e100_serial *info = (struct e100_serial *)tty->driver_data;
 
-	printk("get_modem_info: RTS: %i DTR: %i CD: %i RI: %i DSR: %i CTS: %i\n",
-	       E100_RTS_GET(info),
-	       E100_DTR_GET(info),
-	       E100_CD_GET(info),
-	       E100_RI_GET(info),
-	       E100_DSR_GET(info),
-	       E100_CTS_GET(info));
-#endif
+	if (clear & TIOCM_RTS)
+		e100_rts(info, 0);
+	if (clear & TIOCM_DTR)
+		e100_dtr(info, 0);
+	/* Handle FEMALE behaviour */
+	if (clear & TIOCM_RI)
+		e100_ri_out(info, 0);
+	if (clear & TIOCM_CD)
+		e100_cd_out(info, 0);
+
+	if (set & TIOCM_RTS)
+		e100_rts(info, 1);
+	if (set & TIOCM_DTR)
+		e100_dtr(info, 1);
+	/* Handle FEMALE behaviour */
+	if (set & TIOCM_RI)
+		e100_ri_out(info, 1);
+	if (set & TIOCM_CD)
+		e100_cd_out(info, 1);
+	return 0;
+}
+
+static int
+rs_tiocmget(struct tty_struct *tty, struct file *file)
+{
+	struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+	unsigned int result;
 
 	result =
 		(!E100_RTS_GET(info) ? TIOCM_RTS : 0)
@@ -4021,95 +3624,20 @@ get_modem_info(struct e100_serial * info, unsigned int *value)
 		| (!E100_CTS_GET(info) ? TIOCM_CTS : 0);
 
 #ifdef SERIAL_DEBUG_IO
-	printk("e100ser: modem state: %i 0x%08X\n", result, result);
+	printk(KERN_DEBUG "ser%i: modem state: %i 0x%08X\n",
+		info->line, result, result);
 	{
 		char s[100];
 
 		get_control_state_str(result, s);
-		printk("state: %s\n", s);
+		printk(KERN_DEBUG "state: %s\n", s);
 	}
 #endif
-	if (copy_to_user(value, &result, sizeof(int)))
-		return -EFAULT;
-	return 0;
-}
+	return result;
 
-
-static int
-set_modem_info(struct e100_serial * info, unsigned int cmd,
-	       unsigned int *value)
-{
-	unsigned int arg;
-
-	if (copy_from_user(&arg, value, sizeof(int)))
-		return -EFAULT;
-
-	switch (cmd) {
-	case TIOCMBIS:
-		if (arg & TIOCM_RTS) {
-			e100_rts(info, 1);
-		}
-		if (arg & TIOCM_DTR) {
-			e100_dtr(info, 1);
-		}
-		/* Handle FEMALE behaviour */
-		if (arg & TIOCM_RI) {
-			e100_ri_out(info, 1);
-		}
-		if (arg & TIOCM_CD) {
-			e100_cd_out(info, 1);
-		}
-		break;
-	case TIOCMBIC:
-		if (arg & TIOCM_RTS) {
-			e100_rts(info, 0);
-		}
-		if (arg & TIOCM_DTR) {
-			e100_dtr(info, 0);
-		}
-		/* Handle FEMALE behaviour */
-		if (arg & TIOCM_RI) {
-			e100_ri_out(info, 0);
-		}
-		if (arg & TIOCM_CD) {
-			e100_cd_out(info, 0);
-		}
-		break;
-	case TIOCMSET:
-		e100_rts(info, arg & TIOCM_RTS);
-		e100_dtr(info, arg & TIOCM_DTR);
-		/* Handle FEMALE behaviour */
-		e100_ri_out(info, arg & TIOCM_RI);
-		e100_cd_out(info, arg & TIOCM_CD);
-		break;
-	default:
-		return -EINVAL;
-	}
-	return 0;
 }
 
 
-static void
-rs_break(struct tty_struct *tty, int break_state)
-{
-	struct e100_serial * info = (struct e100_serial *)tty->driver_data;
-	unsigned long flags;
-
-	if (!info->port)
-		return;
-
-	save_flags(flags);
-	cli();
-	if (break_state == -1) {
-		/* Go to manual mode and set the txd pin to 0 */
-		info->tx_ctrl &= 0x3F; /* Clear bit 7 (txd) and 6 (tr_enable) */
-	} else {
-		info->tx_ctrl |= (0x80 | 0x40); /* Set bit 7 (txd) and 6 (tr_enable) */
-	}
-	info->port[REG_TR_CTRL] = info->tx_ctrl;
-	restore_flags(flags);
-}
-
 static int
 rs_ioctl(struct tty_struct *tty, struct file * file,
 	 unsigned int cmd, unsigned long arg)
@@ -4124,49 +3652,45 @@ rs_ioctl(struct tty_struct *tty, struct file * file,
 	}
 
 	switch (cmd) {
-		case TIOCMGET:
-			return get_modem_info(info, (unsigned int *) arg);
-		case TIOCMBIS:
-		case TIOCMBIC:
-		case TIOCMSET:
-			return set_modem_info(info, cmd, (unsigned int *) arg);
-		case TIOCGSERIAL:
-			return get_serial_info(info,
-					       (struct serial_struct *) arg);
-		case TIOCSSERIAL:
-			return set_serial_info(info,
-					       (struct serial_struct *) arg);
-		case TIOCSERGETLSR: /* Get line status register */
-			return get_lsr_info(info, (unsigned int *) arg);
-
-		case TIOCSERGSTRUCT:
-			if (copy_to_user((struct e100_serial *) arg,
-					 info, sizeof(struct e100_serial)))
-				return -EFAULT;
-			return 0;
+	case TIOCGSERIAL:
+		return get_serial_info(info,
+				       (struct serial_struct *) arg);
+	case TIOCSSERIAL:
+		return set_serial_info(info,
+				       (struct serial_struct *) arg);
+	case TIOCSERGETLSR: /* Get line status register */
+		return get_lsr_info(info, (unsigned int *) arg);
+
+	case TIOCSERGSTRUCT:
+		if (copy_to_user((struct e100_serial *) arg,
+				 info, sizeof(struct e100_serial)))
+			return -EFAULT;
+		return 0;
 
 #if defined(CONFIG_ETRAX_RS485)
-		case TIOCSERSETRS485:
-		{
-			struct rs485_control rs485ctrl;
-			if (copy_from_user(&rs485ctrl, (struct rs485_control*)arg, sizeof(rs485ctrl)))
-				return -EFAULT;
+	case TIOCSERSETRS485:
+	{
+		struct rs485_control rs485ctrl;
+		if (copy_from_user(&rs485ctrl, (struct rs485_control *)arg,
+				sizeof(rs485ctrl)))
+			return -EFAULT;
 
-			return e100_enable_rs485(tty, &rs485ctrl);
-		}
+		return e100_enable_rs485(tty, &rs485ctrl);
+	}
 
-		case TIOCSERWRRS485:
-		{
-			struct rs485_write rs485wr;
-			if (copy_from_user(&rs485wr, (struct rs485_write*)arg, sizeof(rs485wr)))
-				return -EFAULT;
+	case TIOCSERWRRS485:
+	{
+		struct rs485_write rs485wr;
+		if (copy_from_user(&rs485wr, (struct rs485_write *)arg,
+				sizeof(rs485wr)))
+			return -EFAULT;
 
-			return e100_write_rs485(tty, 1, rs485wr.outc, rs485wr.outc_size);
-		}
+		return e100_write_rs485(tty, rs485wr.outc, rs485wr.outc_size);
+	}
 #endif
 
-		default:
-			return -ENOIOCTLCMD;
+	default:
+		return -ENOIOCTLCMD;
 	}
 	return 0;
 }
@@ -4191,46 +3715,6 @@ rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 
 }
 
-/* In debugport.c - register a console write function that uses the normal
- * serial driver
- */
-typedef int (*debugport_write_function)(int i, const char *buf, unsigned int len);
-
-extern debugport_write_function debug_write_function;
-
-static int rs_debug_write_function(int i, const char *buf, unsigned int len)
-{
-	int cnt;
-	int written = 0;
-        struct tty_struct *tty;
-        static int recurse_cnt = 0;
-
-        tty = rs_table[i].tty;
-        if (tty)  {
-		unsigned long flags;
-		if (recurse_cnt > 5) /* We skip this debug output */
-			return 1;
-
-		local_irq_save(flags);
-		recurse_cnt++;
-		local_irq_restore(flags);
-                do {
-                        cnt = rs_write(tty, 0, buf + written, len);
-                        if (cnt >= 0) {
-				written += cnt;
-                                buf += cnt;
-                                len -= cnt;
-                        } else
-                                len = cnt;
-                } while(len > 0);
-		local_irq_save(flags);
-		recurse_cnt--;
-		local_irq_restore(flags);
-                return 1;
-        }
-        return 0;
-}
-
 /*
  * ------------------------------------------------------------
  * rs_close()
@@ -4252,11 +3736,10 @@ rs_close(struct tty_struct *tty, struct file * filp)
 
 	/* interrupts are disabled for this entire function */
 
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
 
 	if (tty_hung_up_p(filp)) {
-		restore_flags(flags);
+		local_irq_restore(flags);
 		return;
 	}
 
@@ -4283,7 +3766,7 @@ rs_close(struct tty_struct *tty, struct file * filp)
 		info->count = 0;
 	}
 	if (info->count) {
-		restore_flags(flags);
+		local_irq_restore(flags);
 		return;
 	}
 	info->flags |= ASYNC_CLOSING;
@@ -4337,7 +3820,7 @@ rs_close(struct tty_struct *tty, struct file * filp)
 	}
 	info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 	wake_up_interruptible(&info->close_wait);
-	restore_flags(flags);
+	local_irq_restore(flags);
 
 	/* port closed */
 
@@ -4359,6 +3842,28 @@ rs_close(struct tty_struct *tty, struct file * filp)
 #endif
 	}
 #endif
+
+	/*
+	 * Release any allocated DMA irq's.
+	 */
+	if (info->dma_in_enabled) {
+		free_irq(info->dma_in_irq_nbr, info);
+		cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description);
+		info->uses_dma_in = 0;
+#ifdef SERIAL_DEBUG_OPEN
+		printk(KERN_DEBUG "DMA irq '%s' freed\n",
+			info->dma_in_irq_description);
+#endif
+	}
+	if (info->dma_out_enabled) {
+		free_irq(info->dma_out_irq_nbr, info);
+		cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description);
+		info->uses_dma_out = 0;
+#ifdef SERIAL_DEBUG_OPEN
+		printk(KERN_DEBUG "DMA irq '%s' freed\n",
+			info->dma_out_irq_description);
+#endif
+	}
 }
 
 /*
@@ -4433,8 +3938,8 @@ block_til_ready(struct tty_struct *tty, struct file * filp,
 	 */
 	if (tty_hung_up_p(filp) ||
 	    (info->flags & ASYNC_CLOSING)) {
-		if (info->flags & ASYNC_CLOSING)
-			interruptible_sleep_on(&info->close_wait);
+		wait_event_interruptible(info->close_wait,
+			!(info->flags & ASYNC_CLOSING));
 #ifdef SERIAL_DO_RESTART
 		if (info->flags & ASYNC_HUP_NOTIFY)
 			return -EAGAIN;
@@ -4472,21 +3977,19 @@ block_til_ready(struct tty_struct *tty, struct file * filp,
 	printk("block_til_ready before block: ttyS%d, count = %d\n",
 	       info->line, info->count);
 #endif
-	save_flags(flags);
-	cli();
+	local_irq_save(flags);
 	if (!tty_hung_up_p(filp)) {
 		extra_count++;
 		info->count--;
 	}
-	restore_flags(flags);
+	local_irq_restore(flags);
 	info->blocked_open++;
 	while (1) {
-		save_flags(flags);
-		cli();
+		local_irq_save(flags);
 		/* assert RTS and DTR */
 		e100_rts(info, 1);
 		e100_dtr(info, 1);
-		restore_flags(flags);
+		local_irq_restore(flags);
 		set_current_state(TASK_INTERRUPTIBLE);
 		if (tty_hung_up_p(filp) ||
 		    !(info->flags & ASYNC_INITIALIZED)) {
@@ -4528,6 +4031,19 @@ block_til_ready(struct tty_struct *tty, struct file * filp,
 	return 0;
 }
 
+static void
+deinit_port(struct e100_serial *info)
+{
+	if (info->dma_out_enabled) {
+		cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description);
+		free_irq(info->dma_out_irq_nbr, info);
+	}
+	if (info->dma_in_enabled) {
+		cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description);
+		free_irq(info->dma_in_irq_nbr, info);
+	}
+}
+
 /*
  * This routine is called whenever a serial port is opened.
  * It performs the serial-specific initialization for the tty structure.
@@ -4538,9 +4054,9 @@ rs_open(struct tty_struct *tty, struct file * filp)
 	struct e100_serial	*info;
 	int 			retval, line;
 	unsigned long           page;
+	int                     allocated_resources = 0;
 
 	/* find which port we want to open */
-
 	line = tty->index;
 
 	if (line < 0 || line >= NR_PORTS)
@@ -4580,8 +4096,8 @@ rs_open(struct tty_struct *tty, struct file * filp)
 	 */
 	if (tty_hung_up_p(filp) ||
 	    (info->flags & ASYNC_CLOSING)) {
-		if (info->flags & ASYNC_CLOSING)
-			interruptible_sleep_on(&info->close_wait);
+		wait_event_interruptible(info->close_wait,
+			!(info->flags & ASYNC_CLOSING));
 #ifdef SERIAL_DO_RESTART
 		return ((info->flags & ASYNC_HUP_NOTIFY) ?
 			-EAGAIN : -ERESTARTSYS);
@@ -4591,12 +4107,85 @@ rs_open(struct tty_struct *tty, struct file * filp)
 	}
 
 	/*
+	 * If DMA is enabled try to allocate the irq's.
+	 */
+	if (info->count == 1) {
+		allocated_resources = 1;
+		if (info->dma_in_enabled) {
+			if (request_irq(info->dma_in_irq_nbr,
+					rec_interrupt,
+					info->dma_in_irq_flags,
+					info->dma_in_irq_description,
+					info)) {
+				printk(KERN_WARNING "DMA irq '%s' busy; "
+					"falling back to non-DMA mode\n",
+					info->dma_in_irq_description);
+				/* Make sure we never try to use DMA in */
+				/* for the port again. */
+				info->dma_in_enabled = 0;
+			} else if (cris_request_dma(info->dma_in_nbr,
+					info->dma_in_irq_description,
+					DMA_VERBOSE_ON_ERROR,
+					info->dma_owner)) {
+				free_irq(info->dma_in_irq_nbr, info);
+				printk(KERN_WARNING "DMA '%s' busy; "
+					"falling back to non-DMA mode\n",
+					info->dma_in_irq_description);
+				/* Make sure we never try to use DMA in */
+				/* for the port again. */
+				info->dma_in_enabled = 0;
+			}
+#ifdef SERIAL_DEBUG_OPEN
+			else
+				printk(KERN_DEBUG "DMA irq '%s' allocated\n",
+					info->dma_in_irq_description);
+#endif
+		}
+		if (info->dma_out_enabled) {
+			if (request_irq(info->dma_out_irq_nbr,
+					       tr_interrupt,
+					       info->dma_out_irq_flags,
+					       info->dma_out_irq_description,
+					       info)) {
+				printk(KERN_WARNING "DMA irq '%s' busy; "
+					"falling back to non-DMA mode\n",
+					info->dma_out_irq_description);
+				/* Make sure we never try to use DMA out */
+				/* for the port again. */
+				info->dma_out_enabled = 0;
+			} else if (cris_request_dma(info->dma_out_nbr,
+					     info->dma_out_irq_description,
+					     DMA_VERBOSE_ON_ERROR,
+					     info->dma_owner)) {
+				free_irq(info->dma_out_irq_nbr, info);
+				printk(KERN_WARNING "DMA '%s' busy; "
+					"falling back to non-DMA mode\n",
+					info->dma_out_irq_description);
+				/* Make sure we never try to use DMA out */
+				/* for the port again. */
+				info->dma_out_enabled = 0;
+			}
+#ifdef SERIAL_DEBUG_OPEN
+			else
+				printk(KERN_DEBUG "DMA irq '%s' allocated\n",
+					info->dma_out_irq_description);
+#endif
+		}
+	}
+
+	/*
 	 * Start up the serial port
 	 */
 
 	retval = startup(info);
-	if (retval)
+	if (retval) {
+		if (allocated_resources)
+			deinit_port(info);
+
+		/* FIXME Decrease count info->count here too? */
 		return retval;
+	}
+
 
 	retval = block_til_ready(tty, filp, info);
 	if (retval) {
@@ -4604,6 +4193,9 @@ rs_open(struct tty_struct *tty, struct file * filp)
 		printk("rs_open returning after block_til_ready with %d\n",
 		       retval);
 #endif
+		if (allocated_resources)
+			deinit_port(info);
+
 		return retval;
 	}
 
@@ -4793,6 +4385,8 @@ static const struct tty_operations rs_ops = {
 	.send_xchar = rs_send_xchar,
 	.wait_until_sent = rs_wait_until_sent,
 	.read_proc = rs_read_proc,
+	.tiocmget = rs_tiocmget,
+	.tiocmset = rs_tiocmset
 };
 
 static int __init
@@ -4810,9 +4404,27 @@ rs_init(void)
 	/* Setup the timed flush handler system */
 
 #if !defined(CONFIG_ETRAX_SERIAL_FAST_TIMER)
-	init_timer(&flush_timer);
-	flush_timer.function = timed_flush_handler;
-	mod_timer(&flush_timer, jiffies + CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS);
+	setup_timer(&flush_timer, timed_flush_handler, 0);
+	mod_timer(&flush_timer, jiffies + 5);
+#endif
+
+#if defined(CONFIG_ETRAX_RS485)
+#if defined(CONFIG_ETRAX_RS485_ON_PA)
+	if (cris_io_interface_allocate_pins(if_ser0, 'a', rs485_pa_bit,
+			rs485_pa_bit)) {
+		printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
+			"RS485 pin\n");
+		return -EBUSY;
+	}
+#endif
+#if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
+	if (cris_io_interface_allocate_pins(if_ser0, 'g', rs485_pa_bit,
+			rs485_port_g_bit)) {
+		printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
+			"RS485 pin\n");
+		return -EBUSY;
+	}
+#endif
 #endif
 
 	/* Initialize the tty_driver structure */
@@ -4839,6 +4451,16 @@ rs_init(void)
 	/* do some initializing for the separate ports */
 
 	for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) {
+		if (info->enabled) {
+			if (cris_request_io_interface(info->io_if,
+					info->io_if_description)) {
+				printk(KERN_CRIT "ETRAX100LX async serial: "
+					"Could not allocate IO pins for "
+					"%s, port %d\n",
+					info->io_if_description, i);
+				info->enabled = 0;
+			}
+		}
 		info->uses_dma_in = 0;
 		info->uses_dma_out = 0;
 		info->line = i;
@@ -4872,7 +4494,7 @@ rs_init(void)
 		info->rs485.delay_rts_before_send = 0;
 		info->rs485.enabled = 0;
 #endif
-		INIT_WORK(&info->work, do_softint, info);
+		INIT_WORK(&info->work, do_softint);
 
 		if (info->enabled) {
 			printk(KERN_INFO "%s%d at 0x%x is a builtin UART with DMA\n",
@@ -4890,64 +4512,17 @@ rs_init(void)
 #endif
 
 #ifndef CONFIG_SVINTO_SIM
+#ifndef CONFIG_ETRAX_KGDB
 	/* Not needed in simulator.  May only complicate stuff. */
 	/* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */
 
-	if (request_irq(SERIAL_IRQ_NBR, ser_interrupt, IRQF_SHARED | IRQF_DISABLED, "serial ", NULL))
-		panic("irq8");
-
-#ifdef CONFIG_ETRAX_SERIAL_PORT0
-#ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT
-	if (request_irq(SER0_DMA_TX_IRQ_NBR, tr_interrupt, IRQF_DISABLED, "serial 0 dma tr", NULL))
-		panic("irq22");
-#endif
-#ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN
-	if (request_irq(SER0_DMA_RX_IRQ_NBR, rec_interrupt, IRQF_DISABLED, "serial 0 dma rec", NULL))
-		panic("irq23");
-#endif
-#endif
-
-#ifdef CONFIG_ETRAX_SERIAL_PORT1
-#ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT
-	if (request_irq(SER1_DMA_TX_IRQ_NBR, tr_interrupt, IRQF_DISABLED, "serial 1 dma tr", NULL))
-		panic("irq24");
-#endif
-#ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN
-	if (request_irq(SER1_DMA_RX_IRQ_NBR, rec_interrupt, IRQF_DISABLED, "serial 1 dma rec", NULL))
-		panic("irq25");
-#endif
-#endif
-#ifdef CONFIG_ETRAX_SERIAL_PORT2
-	/* DMA Shared with par0 (and SCSI0 and ATA) */
-#ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT
-	if (request_irq(SER2_DMA_TX_IRQ_NBR, tr_interrupt, IRQF_SHARED | IRQF_DISABLED, "serial 2 dma tr", NULL))
-		panic("irq18");
-#endif
-#ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN
-	if (request_irq(SER2_DMA_RX_IRQ_NBR, rec_interrupt, IRQF_SHARED | IRQF_DISABLED, "serial 2 dma rec", NULL))
-		panic("irq19");
-#endif
-#endif
-#ifdef CONFIG_ETRAX_SERIAL_PORT3
-	/* DMA Shared with par1 (and SCSI1 and Extern DMA 0) */
-#ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT
-	if (request_irq(SER3_DMA_TX_IRQ_NBR, tr_interrupt, IRQF_SHARED | IRQF_DISABLED, "serial 3 dma tr", NULL))
-		panic("irq20");
-#endif
-#ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN
-	if (request_irq(SER3_DMA_RX_IRQ_NBR, rec_interrupt, IRQF_SHARED | IRQF_DISABLED, "serial 3 dma rec", NULL))
-		panic("irq21");
-#endif
-#endif
+	if (request_irq(SERIAL_IRQ_NBR, ser_interrupt,
+			IRQF_SHARED | IRQF_DISABLED, "serial ", driver))
+		panic("%s: Failed to request irq8", __FUNCTION__);
 
-#ifdef CONFIG_ETRAX_SERIAL_FLUSH_DMA_FAST
-	if (request_irq(TIMER1_IRQ_NBR, timeout_interrupt, IRQF_SHARED | IRQF_DISABLED,
-		       "fast serial dma timeout", NULL)) {
-		printk(KERN_CRIT "err: timer1 irq\n");
-	}
 #endif
 #endif /* CONFIG_SVINTO_SIM */
-	debug_write_function = rs_debug_write_function;
+
 	return 0;
 }