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#undef	BLOCKMOVE
#define	Z_WAKE
#undef	Z_EXT_CHARS_IN_BUFFER

/*
 *  linux/drivers/char/cyclades.c
 *
 * This file contains the driver for the Cyclades async multiport
 * serial boards.
 *
 * Initially written by Randolph Bentson <bentson@grieg.seaslug.org>.
 * Modified and maintained by Marcio Saito <marcio@cyclades.com>.
 * Currently maintained by Cyclades team <async@cyclades.com>.
 *
 * For Technical support and installation problems, please send e-mail
 * to support@cyclades.com.
 *
 * Much of the design and some of the code came from serial.c
 * which was copyright (C) 1991, 1992  Linus Torvalds.  It was
 * extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92,
 * and then fixed as suggested by Michael K. Johnson 12/12/92.
 *
 * This version supports shared IRQ's (only for PCI boards).
 *
 * $Log: cyclades.c,v $
 * Prevent users from opening non-existing Z ports.
 *
 * Revision 2.3.2.8   2000/07/06 18:14:16 ivan
 * Fixed the PCI detection function to work properly on Alpha systems.
 * Implemented support for TIOCSERGETLSR ioctl.
 * Implemented full support for non-standard baud rates.
 *
 * Revision 2.3.2.7   2000/06/01 18:26:34 ivan
 * Request PLX I/O region, although driver doesn't use it, to avoid
 * problems with other drivers accessing it.
 * Removed count for on-board buffer characters in cy_chars_in_buffer
 * (Cyclades-Z only).
 *
 * Revision 2.3.2.6   2000/05/05 13:56:05 ivan
 * Driver now reports physical instead of virtual memory addresses.
 * Masks were added to some Cyclades-Z read accesses.
 * Implemented workaround for PLX9050 bug that would cause a system lockup
 * in certain systems, depending on the MMIO addresses allocated to the
 * board.
 * Changed the Tx interrupt programming in the CD1400 chips to boost up
 * performance (Cyclom-Y only).
 * Code is now compliant with the new module interface (module_[init|exit]).
 * Make use of the PCI helper functions to access PCI resources.
 * Did some code "housekeeping".
 *
 * Revision 2.3.2.5   2000/01/19 14:35:33 ivan
 * Fixed bug in cy_set_termios on CRTSCTS flag turnoff.
 *
 * Revision 2.3.2.4   2000/01/17 09:19:40 ivan
 * Fixed SMP locking in Cyclom-Y interrupt handler.
 *
 * Revision 2.3.2.3   1999/12/28 12:11:39 ivan
 * Added a new cyclades_card field called nports to allow the driver to
 * know the exact number of ports found by the Z firmware after its load;
 * RX buffer contention prevention logic on interrupt op mode revisited
 * (Cyclades-Z only);
 * Revisited printk's for Z debug;
 * Driver now makes sure that the constant SERIAL_XMIT_SIZE is defined;
 *
 * Revision 2.3.2.2   1999/10/01 11:27:43 ivan
 * Fixed bug in cyz_poll that would make all ports but port 0 
 * unable to transmit/receive data (Cyclades-Z only);
 * Implemented logic to prevent the RX buffer from being stuck with data
 * due to a driver / firmware race condition in interrupt op mode
 * (Cyclades-Z only);
 * Fixed bug in block_til_ready logic that would lead to a system crash;
 * Revisited cy_close spinlock usage;
 *
 * Revision 2.3.2.1   1999/09/28 11:01:22 ivan
 * Revisited CONFIG_PCI conditional compilation for PCI board support;
 * Implemented TIOCGICOUNT and TIOCMIWAIT ioctl support;
 * _Major_ cleanup on the Cyclades-Z interrupt support code / logic;
 * Removed CTS handling from the driver -- this is now completely handled
 * by the firmware (Cyclades-Z only);
 * Flush RX on-board buffers on a port open (Cyclades-Z only);
 * Fixed handling of ASYNC_SPD_* TTY flags;
 * Module unload now unmaps all memory area allocated by ioremap;
 *
 * Revision 2.3.1.1   1999/07/15 16:45:53 ivan
 * Removed CY_PROC conditional compilation;
 * Implemented SMP-awareness for the driver;
 * Implemented a new ISA IRQ autoprobe that uses the irq_probe_[on|off] 
 * functions;
 * The driver now accepts memory addresses (maddr=0xMMMMM) and IRQs
 * (irq=NN) as parameters (only for ISA boards);
 * Fixed bug in set_line_char that would prevent the Cyclades-Z 
 * ports from being configured at speeds above 115.2Kbps;
 * Fixed bug in cy_set_termios that would prevent XON/XOFF flow control
 * switching from working properly;
 * The driver now only prints IRQ info for the Cyclades-Z if it's 
 * configured to work in interrupt mode;
 *
 * Revision 2.2.2.3   1999/06/28 11:13:29 ivan
 * Added support for interrupt mode operation for the Z cards;
 * Removed the driver inactivity control for the Z;
 * Added a missing MOD_DEC_USE_COUNT in the cy_open function for when 
 * the Z firmware is not loaded yet;
 * Replaced the "manual" Z Tx flush buffer by a call to a FW command of 
 * same functionality;
 * Implemented workaround for IRQ setting loss on the PCI configuration 
 * registers after a PCI bridge EEPROM reload (affects PLX9060 only);
 *
 * Revision 2.2.2.2  1999/05/14 17:18:15 ivan
 * /proc entry location changed to /proc/tty/driver/cyclades;
 * Added support to shared IRQ's (only for PCI boards);
 * Added support for Cobalt Qube2 systems;
 * IRQ [de]allocation scheme revisited;
 * BREAK implementation changed in order to make use of the 'break_ctl'
 * TTY facility;
 * Fixed typo in TTY structure field 'driver_name';
 * Included a PCI bridge reset and EEPROM reload in the board 
 * initialization code (for both Y and Z series).
 *
 * Revision 2.2.2.1  1999/04/08 16:17:43 ivan
 * Fixed a bug in cy_wait_until_sent that was preventing the port to be 
 * closed properly after a SIGINT;
 * Module usage counter scheme revisited;
 * Added support to the upcoming Y PCI boards (i.e., support to additional
 * PCI Device ID's).
 * 
 * Revision 2.2.1.10 1999/01/20 16:14:29 ivan
 * Removed all unnecessary page-alignement operations in ioremap calls
 * (ioremap is currently safe for these operations).
 *
 * Revision 2.2.1.9  1998/12/30 18:18:30 ivan
 * Changed access to PLX PCI bridge registers from I/O to MMIO, in 
 * order to make PLX9050-based boards work with certain motherboards.
 *
 * Revision 2.2.1.8  1998/11/13 12:46:20 ivan
 * cy_close function now resets (correctly) the tty->closing flag;
 * JIFFIES_DIFF macro fixed.
 *
 * Revision 2.2.1.7  1998/09/03 12:07:28 ivan
 * Fixed bug in cy_close function, which was not informing HW of
 * which port should have the reception disabled before doing so;
 * fixed Cyclom-8YoP hardware detection bug.
 *
 * Revision 2.2.1.6  1998/08/20 17:15:39 ivan
 * Fixed bug in cy_close function, which causes malfunction
 * of one of the first 4 ports when a higher port is closed
 * (Cyclom-Y only).
 *
 * Revision 2.2.1.5  1998/08/10 18:10:28 ivan
 * Fixed Cyclom-4Yo hardware detection bug.
 *
 * Revision 2.2.1.4  1998/08/04 11:02:50 ivan
 * /proc/cyclades implementation with great collaboration of 
 * Marc Lewis <marc@blarg.net>;
 * cyy_interrupt was changed to avoid occurrence of kernel oopses
 * during PPP operation.
 *
 * Revision 2.2.1.3  1998/06/01 12:09:10 ivan
 * General code review in order to comply with 2.1 kernel standards;
 * data loss prevention for slow devices revisited (cy_wait_until_sent
 * was created);
 * removed conditional compilation for new/old PCI structure support 
 * (now the driver only supports the new PCI structure).
 *
 * Revision 2.2.1.1  1998/03/19 16:43:12 ivan
 * added conditional compilation for new/old PCI structure support;
 * removed kernel series (2.0.x / 2.1.x) conditional compilation.
 *
 * Revision 2.1.1.3  1998/03/16 18:01:12 ivan
 * cleaned up the data loss fix;
 * fixed XON/XOFF handling once more (Cyclades-Z);
 * general review of the driver routines;
 * introduction of a mechanism to prevent data loss with slow 
 * printers, by forcing a delay before closing the port.
 *
 * Revision 2.1.1.2  1998/02/17 16:50:00 ivan
 * fixed detection/handling of new CD1400 in Ye boards;
 * fixed XON/XOFF handling (Cyclades-Z);
 * fixed data loss caused by a premature port close;
 * introduction of a flag that holds the CD1400 version ID per port
 * (used by the CYGETCD1400VER new ioctl).
 *
 * Revision 2.1.1.1  1997/12/03 17:31:19 ivan
 * Code review for the module cleanup routine;
 * fixed RTS and DTR status report for new CD1400's in get_modem_info;
 * includes anonymous changes regarding signal_pending.
 * 
 * Revision 2.1  1997/11/01 17:42:41 ivan
 * Changes in the driver to support Alpha systems (except 8Zo V_1);
 * BREAK fix for the Cyclades-Z boards;
 * driver inactivity control by FW implemented;
 * introduction of flag that allows driver to take advantage of 
 * a special CD1400 feature related to HW flow control;
 * added support for the CD1400  rev. J (Cyclom-Y boards);
 * introduction of ioctls to:
 *  - control the rtsdtr_inv flag (Cyclom-Y);
 *  - control the rflow flag (Cyclom-Y);
 *  - adjust the polling interval (Cyclades-Z);
 *
 * Revision 1.36.4.33  1997/06/27 19:00:00  ivan
 * Fixes related to kernel version conditional 
 * compilation.
 *  
 * Revision 1.36.4.32  1997/06/14 19:30:00  ivan
 * Compatibility issues between kernels 2.0.x and 
 * 2.1.x (mainly related to clear_bit function).
 *  
 * Revision 1.36.4.31  1997/06/03 15:30:00  ivan
 * Changes to define the memory window according to the 
 * board type.
 *  
 * Revision 1.36.4.30  1997/05/16 15:30:00  daniel
 * Changes to support new cycladesZ boards.
 *
 * Revision 1.36.4.29  1997/05/12 11:30:00  daniel
 * Merge of Bentson's and Daniel's version 1.36.4.28.
 * Corrects bug in cy_detect_pci: check if there are more
 * ports than the number of static structs allocated.
 * Warning message during initialization if this driver is
 * used with the new generation of cycladesZ boards.  Those
 * will be supported only in next release of the driver.
 * Corrects bug in cy_detect_pci and cy_detect_isa that
 * returned wrong number of VALID boards, when a cyclomY
 * was found with no serial modules connected.
 * Changes to use current (2.1.x) kernel subroutine names
 * and created macros for compilation with 2.0.x kernel,
 * instead of the other way around.
 *
 * Revision 1.36.4.28  1997/05/?? ??:00:00  bentson
 * Change queue_task_irq_off to queue_task_irq.
 * The inline function queue_task_irq_off (tqueue.h)
 * was removed from latest releases of 2.1.x kernel.
 * Use of macro __init to mark the initialization
 * routines, so memory can be reused.
 * Also incorporate implementation of critical region
 * in function cleanup_module() created by anonymous
 * linuxer.
 *
 * Revision 1.36.4.28  1997/04/25 16:00:00  daniel
 * Change to support new firmware that solves DCD problem:
 * application could fail to receive SIGHUP signal when DCD
 * varying too fast.
 *
 * Revision 1.36.4.27  1997/03/26 10:30:00  daniel
 * Changed for support linux versions 2.1.X.
 * Backward compatible with linux versions 2.0.X.
 * Corrected illegal use of filler field in
 * CH_CTRL struct.
 * Deleted some debug messages.
 *
 * Revision 1.36.4.26  1997/02/27 12:00:00  daniel
 * Included check for NULL tty pointer in cyz_poll.
 *
 * Revision 1.36.4.25  1997/02/26 16:28:30  bentson
 * Bill Foster at Blarg! Online services noticed that
 * some of the switch elements of -Z modem control
 * lacked a closing "break;"
 *
 * Revision 1.36.4.24  1997/02/24 11:00:00  daniel
 * Changed low water threshold for buffer xmit_buf
 *
 * Revision 1.36.4.23  1996/12/02 21:50:16  bentson
 * Marcio provided fix to modem status fetch for -Z
 *
 * Revision 1.36.4.22  1996/10/28 22:41:17  bentson
 * improve mapping of -Z control page (thanks to Steve
 * Price <stevep@fa.tdktca.com> for help on this)
 *
 * Revision 1.36.4.21  1996/09/10 17:00:10  bentson
 * shift from CPU-bound to memcopy in cyz_polling operation
 *
 * Revision 1.36.4.20  1996/09/09 18:30:32  Bentson
 * Added support to set and report higher speeds.
 *
 * Revision 1.36.4.19c  1996/08/09 10:00:00  Marcio Saito
 * Some fixes in the HW flow control for the BETA release.
 * Don't try to register the IRQ.
 *
 * Revision 1.36.4.19  1996/08/08 16:23:18  Bentson
 * make sure "cyc" appears in all kernel messages; all soft interrupts
 * handled by same routine; recognize out-of-band reception; comment
 * out some diagnostic messages; leave RTS/CTS flow control to hardware;
282
 * fix race condition in -Z buffer management; only -Y needs to explicitly
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 * flush chars; tidy up some startup messages;
 *
 * Revision 1.36.4.18  1996/07/25 18:57:31  bentson
 * shift MOD_INC_USE_COUNT location to match
 * serial.c; purge some diagnostic messages;
 *
 * Revision 1.36.4.17  1996/07/25 18:01:08  bentson
 * enable modem status messages and fetch & process them; note
 * time of last activity type for each port; set_line_char now
 * supports more than line 0 and treats 0 baud correctly;
 * get_modem_info senses rs_status;
 *
 * Revision 1.36.4.16  1996/07/20 08:43:15  bentson
 * barely works--now's time to turn on
 * more features 'til it breaks
 *
 * Revision 1.36.4.15  1996/07/19 22:30:06  bentson
 * check more -Z board status; shorten boot message
 *
 * Revision 1.36.4.14  1996/07/19 22:20:37  bentson
 * fix reference to ch_ctrl in startup; verify return
 * values from cyz_issue_cmd and cyz_update_channel;
 * more stuff to get modem control correct;
 *
 * Revision 1.36.4.13  1996/07/11 19:53:33  bentson
 * more -Z stuff folded in; re-order changes to put -Z stuff
 * after -Y stuff (to make changes clearer)
 *
 * Revision 1.36.4.12  1996/07/11 15:40:55  bentson
 * Add code to poll Cyclades-Z.  Add code to get & set RS-232 control.
 * Add code to send break.  Clear firmware ID word at startup (so
 * that other code won't talk to inactive board).
 *
 * Revision 1.36.4.11  1996/07/09 05:28:29  bentson
 * add code for -Z in set_line_char
 *
 * Revision 1.36.4.10  1996/07/08 19:28:37  bentson
 * fold more -Z stuff (or in some cases, error messages)
 * into driver; add text to "don't know what to do" messages.
 *
 * Revision 1.36.4.9  1996/07/08 18:38:38  bentson
 * moved compile-time flags near top of file; cosmetic changes
 * to narrow text (to allow 2-up printing); changed many declarations
 * to "static" to limit external symbols; shuffled code order to
 * coalesce -Y and -Z specific code, also to put internal functions
 * in order of tty_driver structure; added code to recognize -Z
 * ports (and for moment, do nothing or report error); add cy_startup
 * to parse boot command line for extra base addresses for ISA probes;
 *
 * Revision 1.36.4.8  1996/06/25 17:40:19  bentson
 * reorder some code, fix types of some vars (int vs. long),
 * add cy_setup to support user declared ISA addresses
 *
 * Revision 1.36.4.7  1996/06/21 23:06:18  bentson
 * dump ioctl based firmware load (it's now a user level
 * program); ensure uninitialzed ports cannot be used
 *
 * Revision 1.36.4.6  1996/06/20 23:17:19  bentson
 * rename vars and restructure some code
 *
 * Revision 1.36.4.5  1996/06/14 15:09:44  bentson
 * get right status back after boot load
 *
 * Revision 1.36.4.4  1996/06/13 19:51:44  bentson
 * successfully loads firmware
 *
 * Revision 1.36.4.3  1996/06/13 06:08:33  bentson
 * add more of the code for the boot/load ioctls
 *
 * Revision 1.36.4.2  1996/06/11 21:00:51  bentson
 * start to add Z functionality--starting with ioctl
 * for loading firmware
 *
 * Revision 1.36.4.1  1996/06/10 18:03:02  bentson
 * added code to recognize Z/PCI card at initialization; report
 * presence, but card is not initialized (because firmware needs
 * to be loaded)
 *
 * Revision 1.36.3.8  1996/06/07 16:29:00  bentson
 * starting minor number at zero; added missing verify_area
 * as noted by Heiko Eissfeldt <heiko@colossus.escape.de>
 *
 * Revision 1.36.3.7  1996/04/19 21:06:18  bentson
 * remove unneeded boot message & fix CLOCAL hardware flow
 * control (Miquel van Smoorenburg <miquels@Q.cistron.nl>);
 * remove unused diagnostic statements; minor 0 is first;
 *
 * Revision 1.36.3.6  1996/03/13 13:21:17  marcio
 * The kernel function vremap (available only in later 1.3.xx kernels)
 * allows the access to memory addresses above the RAM. This revision
 * of the driver supports PCI boards below 1Mb (device id 0x100) and
 * above 1Mb (device id 0x101).
 *
 * Revision 1.36.3.5  1996/03/07 15:20:17  bentson
 * Some global changes to interrupt handling spilled into
 * this driver--mostly unused arguments in system function
 * calls.  Also added change by Marcio Saito which should
 * reduce lost interrupts at startup by fast processors.
 *
 * Revision 1.36.3.4  1995/11/13  20:45:10  bentson
 * Changes by Corey Minyard <minyard@wf-rch.cirr.com> distributed
 * in 1.3.41 kernel to remove a possible race condition, extend
 * some error messages, and let the driver run as a loadable module
 * Change by Alan Wendt <alan@ez0.ezlink.com> to remove a
 * possible race condition.
 * Change by Marcio Saito <marcio@cyclades.com> to fix PCI addressing.
 *
 * Revision 1.36.3.3  1995/11/13  19:44:48  bentson
 * Changes by Linus Torvalds in 1.3.33 kernel distribution
 * required due to reordering of driver initialization.
 * Drivers are now initialized *after* memory management.
 *
 * Revision 1.36.3.2  1995/09/08  22:07:14  bentson
 * remove printk from ISR; fix typo
 *
 * Revision 1.36.3.1  1995/09/01  12:00:42  marcio
 * Minor fixes in the PCI board support. PCI function calls in
 * conditional compilation (CONFIG_PCI). Thanks to Jim Duncan
 * <duncan@okay.com>. "bad serial count" message removed.
 *
 * Revision 1.36.3  1995/08/22  09:19:42  marcio
 * Cyclom-Y/PCI support added. Changes in the cy_init routine and
 * board initialization. Changes in the boot messages. The driver
 * supports up to 4 boards and 64 ports by default.
 *
 * Revision 1.36.1.4  1995/03/29  06:14:14  bentson
 * disambiguate between Cyclom-16Y and Cyclom-32Ye;
 *
 * Revision 1.36.1.3  1995/03/23  22:15:35  bentson
 * add missing break in modem control block in ioctl switch statement
 * (discovered by Michael Edward Chastain <mec@jobe.shell.portal.com>);
 *
 * Revision 1.36.1.2  1995/03/22  19:16:22  bentson
 * make sure CTS flow control is set as soon as possible (thanks
 * to note from David Lambert <lambert@chesapeake.rps.slb.com>);
 *
 * Revision 1.36.1.1  1995/03/13  15:44:43  bentson
 * initialize defaults for receive threshold and stale data timeout;
 * cosmetic changes;
 *
 * Revision 1.36  1995/03/10  23:33:53  bentson
 * added support of chips 4-7 in 32 port Cyclom-Ye;
 * fix cy_interrupt pointer dereference problem
 * (Joe Portman <baron@aa.net>);
 * give better error response if open is attempted on non-existent port
 * (Zachariah Vaum <jchryslr@netcom.com>);
 * correct command timeout (Kenneth Lerman <lerman@@seltd.newnet.com>);
 * conditional compilation for -16Y on systems with fast, noisy bus;
 * comment out diagnostic print function;
 * cleaned up table of base addresses;
 * set receiver time-out period register to correct value,
 * set receive threshold to better default values,
 * set chip timer to more accurate 200 Hz ticking,
 * add code to monitor and modify receive parameters
 * (Rik Faith <faith@cs.unc.edu> Nick Simicich
 * <njs@scifi.emi.net>);
 *
 * Revision 1.35  1994/12/16  13:54:18  steffen
 * additional patch by Marcio Saito for board detection
 * Accidently left out in 1.34
 *
 * Revision 1.34  1994/12/10  12:37:12  steffen
 * This is the corrected version as suggested by Marcio Saito
 *
 * Revision 1.33  1994/12/01  22:41:18  bentson
 * add hooks to support more high speeds directly; add tytso
 * patch regarding CLOCAL wakeups
 *
 * Revision 1.32  1994/11/23  19:50:04  bentson
 * allow direct kernel control of higher signalling rates;
 * look for cards at additional locations
 *
 * Revision 1.31  1994/11/16  04:33:28  bentson
 * ANOTHER fix from Corey Minyard, minyard@wf-rch.cirr.com--
 * a problem in chars_in_buffer has been resolved by some
 * small changes;  this should yield smoother output
 *
 * Revision 1.30  1994/11/16  04:28:05  bentson
 * Fix from Corey Minyard, Internet: minyard@metronet.com,
 * UUCP: minyard@wf-rch.cirr.com, WORK: minyardbnr.ca, to
 * cy_hangup that appears to clear up much (all?) of the
 * DTR glitches; also he's added/cleaned-up diagnostic messages
 *
 * Revision 1.29  1994/11/16  04:16:07  bentson
 * add change proposed by Ralph Sims, ralphs@halcyon.com, to
 * operate higher speeds in same way as other serial ports;
 * add more serial ports (for up to two 16-port muxes).
 *
 * Revision 1.28  1994/11/04  00:13:16  root
 * turn off diagnostic messages
 *
 * Revision 1.27  1994/11/03  23:46:37  root
 * bunch of changes to bring driver into greater conformance
 * with the serial.c driver (looking for missed fixes)
 *
 * Revision 1.26  1994/11/03  22:40:36  root
 * automatic interrupt probing fixed.
 *
 * Revision 1.25  1994/11/03  20:17:02  root
 * start to implement auto-irq
 *
 * Revision 1.24  1994/11/03  18:01:55  root
 * still working on modem signals--trying not to drop DTR
 * during the getty/login processes
 *
 * Revision 1.23  1994/11/03  17:51:36  root
 * extend baud rate support; set receive threshold as function
 * of baud rate; fix some problems with RTS/CTS;
 *
 * Revision 1.22  1994/11/02  18:05:35  root
 * changed arguments to udelay to type long to get
 * delays to be of correct duration
 *
 * Revision 1.21  1994/11/02  17:37:30  root
 * employ udelay (after calibrating loops_per_second earlier
 * in init/main.c) instead of using home-grown delay routines
 *
 * Revision 1.20  1994/11/02  03:11:38  root
 * cy_chars_in_buffer forces a return value of 0 to let
 * login work (don't know why it does); some functions
 * that were returning EFAULT, now executes the code;
 * more work on deciding when to disable xmit interrupts;
 *
 * Revision 1.19  1994/11/01  20:10:14  root
 * define routine to start transmission interrupts (by enabling
 * transmit interrupts); directly enable/disable modem interrupts;
 *
 * Revision 1.18  1994/11/01  18:40:45  bentson
 * Don't always enable transmit interrupts in startup; interrupt on
 * TxMpty instead of TxRdy to help characters get out before shutdown;
 * restructure xmit interrupt to check for chars first and quit if
 * none are ready to go; modem status (MXVRx) is upright, _not_ inverted
 * (to my view);
 *
 * Revision 1.17  1994/10/30  04:39:45  bentson
 * rename serial_driver and callout_driver to cy_serial_driver and
 * cy_callout_driver to avoid linkage interference; initialize
 * info->type to PORT_CIRRUS; ruggedize paranoia test; elide ->port
 * from cyclades_port structure; add paranoia check to cy_close;
 *
 * Revision 1.16  1994/10/30  01:14:33  bentson
 * change major numbers; add some _early_ return statements;
 *
 * Revision 1.15  1994/10/29  06:43:15  bentson
 * final tidying up for clean compile;  enable some error reporting
 *
 * Revision 1.14  1994/10/28  20:30:22  Bentson
 * lots of changes to drag the driver towards the new tty_io
 * structures and operation.  not expected to work, but may
 * compile cleanly.
 *
 * Revision 1.13  1994/07/21  23:08:57  Bentson
 * add some diagnostic cruft; support 24 lines (for testing
 * both -8Y and -16Y cards; be more thorough in servicing all
 * chips during interrupt; add "volatile" a few places to
 * circumvent compiler optimizations; fix base & offset
 * computations in block_til_ready (was causing chip 0 to
 * stop operation)
 *
 * Revision 1.12  1994/07/19  16:42:11  Bentson
 * add some hackery for kernel version 1.1.8; expand
 * error messages; refine timing for delay loops and
 * declare loop params volatile
 *
 * Revision 1.11  1994/06/11  21:53:10  bentson
 * get use of save_car right in transmit interrupt service
 *
 * Revision 1.10.1.1  1994/06/11  21:31:18  bentson
 * add some diagnostic printing; try to fix save_car stuff
 *
 * Revision 1.10  1994/06/11  20:36:08  bentson
 * clean up compiler warnings
 *
 * Revision 1.9  1994/06/11  19:42:46  bentson
 * added a bunch of code to support modem signalling
 *
 * Revision 1.8  1994/06/11  17:57:07  bentson
 * recognize break & parity error
 *
 * Revision 1.7  1994/06/05  05:51:34  bentson
 * Reorder baud table to be monotonic; add cli to CP; discard
 * incoming characters and status if the line isn't open; start to
 * fold code into cy_throttle; start to port get_serial_info,
 * set_serial_info, get_modem_info, set_modem_info, and send_break
 * from serial.c; expand cy_ioctl; relocate and expand config_setup;
 * get flow control characters from tty struct; invalidate ports w/o
 * hardware;
 *
 * Revision 1.6  1994/05/31  18:42:21  bentson
 * add a loop-breaker in the interrupt service routine;
 * note when port is initialized so that it can be shut
 * down under the right conditions; receive works without
 * any obvious errors
 *
 * Revision 1.5  1994/05/30  00:55:02  bentson
 * transmit works without obvious errors
 *
 * Revision 1.4  1994/05/27  18:46:27  bentson
 * incorporated more code from lib_y.c; can now print short
 * strings under interrupt control to port zero; seems to
 * select ports/channels/lines correctly
 *
 * Revision 1.3  1994/05/25  22:12:44  bentson
 * shifting from multi-port on a card to proper multiplexor
 * data structures;  added skeletons of most routines
 *
 * Revision 1.2  1994/05/19  13:21:43  bentson
 * start to crib from other sources
 *
 */

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#define CY_VERSION	"2.4"

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/* If you need to install more boards than NR_CARDS, change the constant
   in the definition below. No other change is necessary to support up to
   eight boards. Beyond that you'll have to extend cy_isa_addresses. */

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#define NR_CARDS	4
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/*
   If the total number of ports is larger than NR_PORTS, change this
   constant in the definition below. No other change is necessary to
   support more boards/ports. */

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#define NR_PORTS	256
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#define ZE_V1_NPORTS	64
#define ZO_V1	0
#define ZO_V2	1
#define ZE_V1	2

#define	SERIAL_PARANOIA_CHECK
#undef	CY_DEBUG_OPEN
#undef	CY_DEBUG_THROTTLE
#undef	CY_DEBUG_OTHER
#undef	CY_DEBUG_IO
#undef	CY_DEBUG_COUNT
#undef	CY_DEBUG_DTR
#undef	CY_DEBUG_WAIT_UNTIL_SENT
#undef	CY_DEBUG_INTERRUPTS
#undef	CY_16Y_HACK
#undef	CY_ENABLE_MONITORING
#undef	CY_PCI_DEBUG

#if 0
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#define PAUSE __asm__("nop")
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#else
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#define PAUSE do {} while (0)
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#endif

/*
 * Include section 
 */
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/serial.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/cyclades.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/bitops.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>

#define	CY_LOCK(info,flags)					\
		do {						\
		spin_lock_irqsave(&cy_card[info->card].card_lock, flags); \
		} while (0)
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#define	CY_UNLOCK(info,flags)					\
		do {						\
		spin_unlock_irqrestore(&cy_card[info->card].card_lock, flags); \
		} while (0)

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>

#include <linux/stat.h>
#include <linux/proc_fs.h>

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static void cy_throttle(struct tty_struct *tty);
static void cy_send_xchar(struct tty_struct *tty, char ch);
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#define IS_CYC_Z(card) ((card).num_chips == -1)

#define Z_FPGA_CHECK(card) \
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	((cy_readl(&((struct RUNTIME_9060 __iomem *) \
		((card).ctl_addr))->init_ctrl) & (1<<17)) != 0)
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#define ISZLOADED(card)	(((ZO_V1==cy_readl(&((struct RUNTIME_9060 __iomem *) \
			((card).ctl_addr))->mail_box_0)) || \
			Z_FPGA_CHECK(card)) && \
			(ZFIRM_ID==cy_readl(&((struct FIRM_ID __iomem *) \
			((card).base_addr+ID_ADDRESS))->signature)))

#ifndef SERIAL_XMIT_SIZE
#define	SERIAL_XMIT_SIZE	(min(PAGE_SIZE, 4096))
#endif
#define WAKEUP_CHARS		256

#define STD_COM_FLAGS (0)

static struct tty_driver *cy_serial_driver;

#ifdef CONFIG_ISA
/* This is the address lookup table. The driver will probe for
   Cyclom-Y/ISA boards at all addresses in here. If you want the
   driver to probe addresses at a different address, add it to
   this table.  If the driver is probing some other board and
   causing problems, remove the offending address from this table.
   The cy_setup function extracts additional addresses from the
   boot options line.  The form is "cyclades=address,address..."
*/

static unsigned int cy_isa_addresses[] = {
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	0xD0000,
	0xD2000,
	0xD4000,
	0xD6000,
	0xD8000,
	0xDA000,
	0xDC000,
	0xDE000,
	0, 0, 0, 0, 0, 0, 0, 0
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};
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#define NR_ISA_ADDRS ARRAY_SIZE(cy_isa_addresses)
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#ifdef MODULE
static long maddr[NR_CARDS] = { 0, };
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static int irq[NR_CARDS] = { 0, };
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module_param_array(maddr, long, NULL, 0);
module_param_array(irq, int, NULL, 0);
#endif

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#endif				/* CONFIG_ISA */
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/* This is the per-card data structure containing address, irq, number of
   channels, etc. This driver supports a maximum of NR_CARDS cards.
*/
static struct cyclades_card cy_card[NR_CARDS];

/* This is the per-channel data structure containing pointers, flags
 and variables for the port. This driver supports a maximum of NR_PORTS.
*/
static struct cyclades_port cy_port[NR_PORTS];

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static int cy_next_channel;	/* next minor available */
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/*
 * This is used to look up the divisor speeds and the timeouts
 * We're normally limited to 15 distinct baud rates.  The extra
 * are accessed via settings in info->flags.
 *      0,     1,     2,     3,     4,     5,     6,     7,     8,     9,
 *     10,    11,    12,    13,    14,    15,    16,    17,    18,    19,
 *                                               HI            VHI
 *     20
 */
static int baud_table[] = {
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	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
	1800, 2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200, 150000,
	230400, 0
};

static char baud_co_25[] = {	/* 25 MHz clock option table */
	/* value =>    00    01   02    03    04 */
	/* divide by    8    32   128   512  2048 */
	0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x02,
	0x02, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

static char baud_bpr_25[] = {	/* 25 MHz baud rate period table */
	0x00, 0xf5, 0xa3, 0x6f, 0x5c, 0x51, 0xf5, 0xa3, 0x51, 0xa3,
	0x6d, 0x51, 0xa3, 0x51, 0xa3, 0x51, 0x36, 0x29, 0x1b, 0x15
};

static char baud_co_60[] = {	/* 60 MHz clock option table (CD1400 J) */
	/* value =>    00    01   02    03    04 */
	/* divide by    8    32   128   512  2048 */
	0x00, 0x00, 0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03,
	0x03, 0x02, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00
};

static char baud_bpr_60[] = {	/* 60 MHz baud rate period table (CD1400 J) */
	0x00, 0x82, 0x21, 0xff, 0xdb, 0xc3, 0x92, 0x62, 0xc3, 0x62,
	0x41, 0xc3, 0x62, 0xc3, 0x62, 0xc3, 0x82, 0x62, 0x41, 0x32,
	0x21
};

static char baud_cor3[] = {	/* receive threshold */
	0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
	0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x08, 0x08, 0x08, 0x08, 0x07,
	0x07
};
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/*
 * The Cyclades driver implements HW flow control as any serial driver.
 * The cyclades_port structure member rflow and the vector rflow_thr 
 * allows us to take advantage of a special feature in the CD1400 to avoid 
 * data loss even when the system interrupt latency is too high. These flags 
 * are to be used only with very special applications. Setting these flags 
 * requires the use of a special cable (DTR and RTS reversed). In the new 
 * CD1400-based boards (rev. 6.00 or later), there is no need for special 
 * cables.
 */

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static char rflow_thr[] = {	/* rflow threshold */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
	0x0a
};
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/*  The Cyclom-Ye has placed the sequential chips in non-sequential
 *  address order.  This look-up table overcomes that problem.
 */
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static int cy_chip_offset[] = { 0x0000,
	0x0400,
	0x0800,
	0x0C00,
	0x0200,
	0x0600,
	0x0A00,
	0x0E00
};
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/* PCI related definitions */

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static unsigned short cy_pci_nboard;
static unsigned short cy_isa_nboard;
static unsigned short cy_nboard;
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#ifdef CONFIG_PCI
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static unsigned short cy_pci_dev_id[] = {
	PCI_DEVICE_ID_CYCLOM_Y_Lo,	/* PCI < 1Mb */
	PCI_DEVICE_ID_CYCLOM_Y_Hi,	/* PCI > 1Mb */
	PCI_DEVICE_ID_CYCLOM_4Y_Lo,	/* 4Y PCI < 1Mb */
	PCI_DEVICE_ID_CYCLOM_4Y_Hi,	/* 4Y PCI > 1Mb */
	PCI_DEVICE_ID_CYCLOM_8Y_Lo,	/* 8Y PCI < 1Mb */
	PCI_DEVICE_ID_CYCLOM_8Y_Hi,	/* 8Y PCI > 1Mb */
	PCI_DEVICE_ID_CYCLOM_Z_Lo,	/* Z PCI < 1Mb */
	PCI_DEVICE_ID_CYCLOM_Z_Hi,	/* Z PCI > 1Mb */
	0			/* end of table */
};
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#endif

static void cy_start(struct tty_struct *);
static void set_line_char(struct cyclades_port *);
static int cyz_issue_cmd(struct cyclades_card *, uclong, ucchar, uclong);
#ifdef CONFIG_ISA
static unsigned detect_isa_irq(void __iomem *);
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#endif				/* CONFIG_ISA */
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static int cyclades_get_proc_info(char *, char **, off_t, int, int *, void *);
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#ifndef CONFIG_CYZ_INTR
static void cyz_poll(unsigned long);

/* The Cyclades-Z polling cycle is defined by this variable */
static long cyz_polling_cycle = CZ_DEF_POLL;

static int cyz_timeron = 0;
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static DEFINE_TIMER(cyz_timerlist, cyz_poll, 0, 0);
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#else				/* CONFIG_CYZ_INTR */
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static void cyz_rx_restart(unsigned long);
static struct timer_list cyz_rx_full_timer[NR_PORTS];
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#endif				/* CONFIG_CYZ_INTR */
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static inline int serial_paranoia_check(struct cyclades_port *info,
		char *name, const char *routine)
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{
#ifdef SERIAL_PARANOIA_CHECK
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	if (!info) {
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		printk("cyc Warning: null cyclades_port for (%s) in %s\n",
				name, routine);
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		return 1;
	}

	if ((long)info < (long)(&cy_port[0]) ||
			(long)(&cy_port[NR_PORTS]) < (long)info) {
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		printk("cyc Warning: cyclades_port out of range for (%s) in "
				"%s\n", name, routine);
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		return 1;
	}

	if (info->magic != CYCLADES_MAGIC) {
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		printk("cyc Warning: bad magic number for serial struct (%s) "
				"in %s\n", name, routine);
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		return 1;
	}
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#endif
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	return 0;
}				/* serial_paranoia_check */
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/*
 * This routine is used by the interrupt handler to schedule
 * processing in the software interrupt portion of the driver
 * (also known as the "bottom half").  This can be called any
 * number of times for any channel without harm.
 */
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static inline void cy_sched_event(struct cyclades_port *info, int event)
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{
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	info->event |= 1 << event; /* remember what kind of event and who */
	schedule_work(&info->tqueue);
}				/* cy_sched_event */
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/*
 * This routine is used to handle the "bottom half" processing for the
 * serial driver, known also the "software interrupt" processing.
 * This processing is done at the kernel interrupt level, after the
 * cy#/_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
 * is where time-consuming activities which can not be done in the
 * interrupt driver proper are done; the interrupt driver schedules
 * them using cy_sched_event(), and they get done here.
 *
 * This is done through one level of indirection--the task queue.
 * When a hardware interrupt service routine wants service by the
 * driver's bottom half, it enqueues the appropriate tq_struct (one
 * per port) to the keventd work queue and sets a request flag
 * that the work queue be processed.
 *
 * Although this may seem unwieldy, it gives the system a way to
 * pass an argument (in this case the pointer to the cyclades_port
 * structure) to the bottom half of the driver.  Previous kernels
 * had to poll every port to see if that port needed servicing.
 */
static void
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do_softint(struct work_struct *work)
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{
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	struct cyclades_port *info =
		container_of(work, struct cyclades_port, tqueue);
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	struct tty_struct    *tty;

	tty = info->tty;
	if (!tty)
		return;

	if (test_and_clear_bit(Cy_EVENT_HANGUP, &info->event)) {
		tty_hangup(info->tty);
		wake_up_interruptible(&info->open_wait);
		        info->flags &= ~ASYNC_NORMAL_ACTIVE;
	}
	if (test_and_clear_bit(Cy_EVENT_OPEN_WAKEUP, &info->event))
		wake_up_interruptible(&info->open_wait);
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#ifdef CONFIG_CYZ_INTR
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	if (test_and_clear_bit(Cy_EVENT_Z_RX_FULL, &info->event)) {
		if (cyz_rx_full_timer[info->line].function == NULL) {
			cyz_rx_full_timer[info->line].expires = jiffies + 1;
			cyz_rx_full_timer[info->line].function = cyz_rx_restart;
			cyz_rx_full_timer[info->line].data =
						(unsigned long)info;
			add_timer(&cyz_rx_full_timer[info->line]);
		}
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	}
#endif
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	if (test_and_clear_bit(Cy_EVENT_DELTA_WAKEUP, &info->event))
		wake_up_interruptible(&info->delta_msr_wait);
	tty_wakeup(tty);
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#ifdef Z_WAKE
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	if (test_and_clear_bit(Cy_EVENT_SHUTDOWN_WAKEUP, &info->event))
		wake_up_interruptible(&info->shutdown_wait);
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#endif
} /* do_softint */


/***********************************************************/
/********* Start of block of Cyclom-Y specific code ********/

/* This routine waits up to 1000 micro-seconds for the previous
   command to the Cirrus chip to complete and then issues the
   new command.  An error is returned if the previous command
   didn't finish within the time limit.

   This function is only called from inside spinlock-protected code.
 */
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static int cyy_issue_cmd(void __iomem * base_addr, u_char cmd, int index)
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{
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	volatile int i;
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	/* Check to see that the previous command has completed */
	for (i = 0; i < 100; i++) {
		if (cy_readb(base_addr + (CyCCR << index)) == 0) {
			break;
		}
		udelay(10L);
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	}
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	/* if the CCR never cleared, the previous command
	   didn't finish within the "reasonable time" */
	if (i == 100)
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		return -1;
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	/* Issue the new command */
	cy_writeb(base_addr + (CyCCR << index), cmd);
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	return 0;
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}				/* cyy_issue_cmd */
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#ifdef CONFIG_ISA
/* ISA interrupt detection code */
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static unsigned detect_isa_irq(void __iomem * address)
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{
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	int irq;
	unsigned long irqs, flags;
	int save_xir, save_car;
	int index = 0;		/* IRQ probing is only for ISA */

	/* forget possible initially masked and pending IRQ */
	irq = probe_irq_off(probe_irq_on());

	/* Clear interrupts on the board first */
	cy_writeb(address + (Cy_ClrIntr << index), 0);
	/* Cy_ClrIntr is 0x1800 */

	irqs = probe_irq_on();
	/* Wait ... */
	udelay(5000L);

	/* Enable the Tx interrupts on the CD1400 */
	local_irq_save(flags);
	cy_writeb(address + (CyCAR << index), 0);
	cyy_issue_cmd(address, CyCHAN_CTL | CyENB_XMTR, index);

	cy_writeb(address + (CyCAR << index), 0);
	cy_writeb(address + (CySRER << index),
		  cy_readb(address + (CySRER << index)) | CyTxRdy);
	local_irq_restore(flags);

	/* Wait ... */
	udelay(5000L);

	/* Check which interrupt is in use */
	irq = probe_irq_off(irqs);

	/* Clean up */
	save_xir = (u_char) cy_readb(address + (CyTIR << index));
	save_car = cy_readb(address + (CyCAR << index));
	cy_writeb(address + (CyCAR << index), (save_xir & 0x3));
	cy_writeb(address + (CySRER << index),
		  cy_readb(address + (CySRER << index)) & ~CyTxRdy);
	cy_writeb(address + (CyTIR << index), (save_xir & 0x3f));
	cy_writeb(address + (CyCAR << index), (save_car));
	cy_writeb(address + (Cy_ClrIntr << index), 0);
	/* Cy_ClrIntr is 0x1800 */

	return (irq > 0) ? irq : 0;
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}
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#endif				/* CONFIG_ISA */
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1047

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static void cyy_intr_chip(struct cyclades_card *cinfo, int chip,
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			void __iomem * base_addr, int status, int index)
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{
	struct cyclades_port *info;
	struct tty_struct *tty;
	volatile int char_count;
	int i, j, len, mdm_change, mdm_status, outch;
	int save_xir, channel, save_car;
	char data;

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	if (status & CySRReceive) {	/* reception interrupt */
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#ifdef CY_DEBUG_INTERRUPTS
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		printk("cyy_interrupt: rcvd intr, chip %d\n\r", chip);
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#endif
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		/* determine the channel & change to that context */
		spin_lock(&cinfo->card_lock);
		save_xir = (u_char) cy_readb(base_addr + (CyRIR << index));
		channel = (u_short) (save_xir & CyIRChannel);
		i = channel + chip * 4 + cinfo->first_line;
		info = &cy_port[i];
		info->last_active = jiffies;
		save_car = cy_readb(base_addr + (CyCAR << index));
		cy_writeb(base_addr + (CyCAR << index), save_xir);

		/* if there is nowhere to put the data, discard it */
		if (info->tty == 0) {
			j = (cy_readb(base_addr + (CyRIVR << index)) &
				CyIVRMask);
			if (j == CyIVRRxEx) {	/* exception */
				data = cy_readb(base_addr + (CyRDSR << index));
			} else {	/* normal character reception */
				char_count = cy_readb(base_addr +
						(CyRDCR << index));
				while (char_count--) {
					data = cy_readb(base_addr +
						(CyRDSR << index));
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				}
			}
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		} else {	/* there is an open port for this data */
			tty = info->tty;
			j = (cy_readb(base_addr + (CyRIVR << index)) &
					CyIVRMask);
			if (j == CyIVRRxEx) {	/* exception */
				data = cy_readb(base_addr + (CyRDSR << index));

				/* For statistics only */
				if (data & CyBREAK)
					info->icount.brk++;
				else if (data & CyFRAME)
					info->icount.frame++;
				else if (data & CyPARITY)
					info->icount.parity++;
				else if (data & CyOVERRUN)
					info->icount.overrun++;

				if (data & info->ignore_status_mask) {
					info->icount.rx++;
					return;
				}
				if (tty_buffer_request_room(tty, 1)) {
					if (data & info->read_status_mask) {
						if (data & CyBREAK) {
							tty_insert_flip_char(
								tty,
								cy_readb(
								base_addr +
								(CyRDSR <<
									index)),
								TTY_BREAK);
							info->icount.rx++;
							if (info->flags &
							    ASYNC_SAK) {
								do_SAK(tty);
							}
						} else if (data & CyFRAME) {
							tty_insert_flip_char(
								tty,
								cy_readb(
								base_addr +
								(CyRDSR <<
									index)),
								TTY_FRAME);
							info->icount.rx++;
							info->idle_stats.
								frame_errs++;
						} else if (data & CyPARITY) {
							/* Pieces of seven... */
							tty_insert_flip_char(
								tty,
								cy_readb(
								base_addr +
								(CyRDSR <<
									index)),
								TTY_PARITY);
							info->icount.rx++;
							info->idle_stats.
								parity_errs++;
						} else if (data & CyOVERRUN) {
							tty_insert_flip_char(
								tty, 0,
								TTY_OVERRUN);
							info->icount.rx++;
						/* If the flip buffer itself is
						   overflowing, we still lose
						   the next incoming character.
						 */
							tty_insert_flip_char(
								tty,
								cy_readb(
								base_addr +
								(CyRDSR <<
									index)),
								TTY_FRAME);
							info->icount.rx++;
							info->idle_stats.
								overruns++;
					/* These two conditions may imply */
					/* a normal read should be done. */
					/* }else if(data & CyTIMEOUT){ */
					/* }else if(data & CySPECHAR){ */
						} else {
							tty_insert_flip_char(
								tty, 0,
								TTY_NORMAL);
							info->icount.rx++;
						}
					} else {
						tty_insert_flip_char(tty, 0,
								TTY_NORMAL);
						info->icount.rx++;
					}
				} else {
					/* there was a software buffer
					   overrun and nothing could be
					   done about it!!! */
					info->icount.buf_overrun++;
					info->idle_stats.overruns++;
				}
			} else {	/* normal character reception */
				/* load # chars available from the chip */
				char_count = cy_readb(base_addr +
						(CyRDCR << index));
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#ifdef CY_ENABLE_MONITORING
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				++info->mon.int_count;
				info->mon.char_count += char_count;
				if (char_count > info->mon.char_max)
					info->mon.char_max = char_count;
				info->mon.char_last = char_count;
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#endif
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				len = tty_buffer_request_room(tty, char_count);
				while (len--) {
					data = cy_readb(base_addr +
							(CyRDSR << index));
					tty_insert_flip_char(tty, data,
							TTY_NORMAL);
					info->idle_stats.recv_bytes++;
					info->icount.rx++;
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#ifdef CY_16Y_HACK
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					udelay(10L);
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#endif
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				}
				info->idle_stats.recv_idle = jiffies;
			}
			tty_schedule_flip(tty);
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		}
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		/* end of service */
		cy_writeb(base_addr + (CyRIR << index), (save_xir & 0x3f));
		cy_writeb(base_addr + (CyCAR << index), (save_car));
		spin_unlock(&cinfo->card_lock);
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	}

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	if (status & CySRTransmit) {	/* transmission interrupt */
		/* Since we only get here when the transmit buffer
		   is empty, we know we can always stuff a dozen
		   characters. */
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#ifdef CY_DEBUG_INTERRUPTS
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		printk("cyy_interrupt: xmit intr, chip %d\n\r", chip);
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#endif

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		/* determine the channel & change to that context */
		spin_lock(&cinfo->card_lock);
		save_xir = (u_char) cy_readb(base_addr + (CyTIR << index));
		channel = (u_short) (save_xir & CyIRChannel);
		i = channel + chip * 4 + cinfo->first_line;
		save_car = cy_readb(base_addr + (CyCAR << index));
		cy_writeb(base_addr + (CyCAR << index), save_xir);

		/* validate the port# (as configured and open) */
		if ((i < 0) || (NR_PORTS <= i)) {
			cy_writeb(base_addr + (CySRER << index),
				  cy_readb(base_addr + (CySRER << index)) &
				  ~CyTxRdy);
			goto txend;
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		}
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		info = &cy_port[i];
		info->last_active = jiffies;
		if (info->tty == 0) {
			cy_writeb(base_addr + (CySRER << index),
				  cy_readb(base_addr + (CySRER << index)) &
				  ~CyTxRdy);
			goto txdone;
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		}
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		/* load the on-chip space for outbound data */
		char_count = info->xmit_fifo_size;

		if (info->x_char) {	/* send special char */
			outch = info->x_char;
			cy_writeb(base_addr + (CyTDR << index), outch);
			char_count--;
			info->icount.tx++;
			info->x_char = 0;
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		}
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		if (info->breakon || info->breakoff) {
			if (info->breakon) {
				cy_writeb(base_addr + (CyTDR << index), 0);
				cy_writeb(base_addr + (CyTDR << index), 0x81);
				info->breakon = 0;
				char_count -= 2;
			}
			if (info->breakoff) {
				cy_writeb(base_addr + (CyTDR << index), 0);
				cy_writeb(base_addr + (CyTDR << index), 0x83);
				info->breakoff = 0;
				char_count -= 2;
			}
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		}
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		while (char_count-- > 0) {
			if (!info->xmit_cnt) {
				if (cy_readb(base_addr + (CySRER << index)) &
						CyTxMpty) {
					cy_writeb(base_addr + (CySRER << index),
						cy_readb(base_addr +
							(CySRER << index)) &
						~CyTxMpty);
				} else {
					cy_writeb(base_addr + (CySRER << index),
						(cy_readb(base_addr +
						  	(CySRER << index)) &
						~CyTxRdy) | CyTxMpty);
				}
				goto txdone;
			}
			if (info->xmit_buf == 0) {
				cy_writeb(base_addr + (CySRER << index),
					cy_readb(base_addr + (CySRER << index))&
					~CyTxRdy);
				goto txdone;
			}
			if (info->tty->stopped || info->tty->hw_stopped) {
				cy_writeb(base_addr + (CySRER << index),
					cy_readb(base_addr + (CySRER << index))&
					~CyTxRdy);
				goto txdone;
			}
			/* Because the Embedded Transmit Commands have
			   been enabled, we must check to see if the
			   escape character, NULL, is being sent.  If it
			   is, we must ensure that there is room for it
			   to be doubled in the output stream.  Therefore
			   we no longer advance the pointer when the
			   character is fetched, but rather wait until
			   after the check for a NULL output character.
			   This is necessary because there may not be
			   room for the two chars needed to send a NULL.)
			 */
			outch = info->xmit_buf[info->xmit_tail];
			if (outch) {
				info->xmit_cnt--;
				info->xmit_tail = (info->xmit_tail + 1) &
						(SERIAL_XMIT_SIZE - 1);
				cy_writeb(base_addr + (CyTDR << index), outch);
				info->icount.tx++;
			} else {
				if (char_count > 1) {
					info->xmit_cnt--;
					info->xmit_tail = (info->xmit_tail + 1)&
						(SERIAL_XMIT_SIZE - 1);
					cy_writeb(base_addr + (CyTDR << index),
						outch);
					cy_writeb(base_addr + (CyTDR << index),
						0);
					info->icount.tx++;
					char_count--;
				} else {
				}
			}
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		}

txdone:
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		if (info->xmit_cnt < WAKEUP_CHARS) {
			cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
		}
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txend:
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		/* end of service */
		cy_writeb(base_addr + (CyTIR << index), (save_xir & 0x3f));
		cy_writeb(base_addr + (CyCAR << index), (save_car));
		spin_unlock(&cinfo->card_lock);
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	}

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	if (status & CySRModem) {	/* modem interrupt */
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		/* determine the channel & change to that context */
		spin_lock(&cinfo->card_lock);
		save_xir = (u_char) cy_readb(base_addr + (CyMIR << index));
		channel = (u_short) (save_xir & CyIRChannel);
		info = &cy_port[channel + chip * 4 + cinfo->first_line];
		info->last_active = jiffies;
		save_car = cy_readb(base_addr + (CyCAR << index));
		cy_writeb(base_addr + (CyCAR << index), save_xir);

		mdm_change = cy_readb(base_addr + (CyMISR << index));
		mdm_status = cy_readb(base_addr + (CyMSVR1 << index));

		if (info->tty == 0) {	/* no place for data, ignore it */
			;
		} else {
			if (mdm_change & CyANY_DELTA) {
				/* For statistics only */
				if (mdm_change & CyDCD)
					info->icount.dcd++;
				if (mdm_change & CyCTS)
					info->icount.cts++;
				if (mdm_change & CyDSR)
					info->icount.dsr++;
				if (mdm_change & CyRI)
					info->icount.rng++;

				cy_sched_event(info, Cy_EVENT_DELTA_WAKEUP);
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			}
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			if ((mdm_change & CyDCD) &&
					(info->flags & ASYNC_CHECK_CD)) {
				if (mdm_status & CyDCD) {
					cy_sched_event(info,
							Cy_EVENT_OPEN_WAKEUP);
				} else {
					cy_sched_event(info, Cy_EVENT_HANGUP);
				}
			}
			if ((mdm_change & CyCTS) &&
					(info->flags & ASYNC_CTS_FLOW)) {
				if (info->tty->hw_stopped) {
					if (mdm_status & CyCTS) {
						/* cy_start isn't used
						   because... !!! */
						info->tty->hw_stopped = 0;
						cy_writeb(base_addr +
							(CySRER << index),
							cy_readb(base_addr +
								(CySRER <<
									index))|
							CyTxRdy);
						cy_sched_event(info,
							Cy_EVENT_WRITE_WAKEUP);
					}
				} else {
					if (!(mdm_status & CyCTS)) {
						/* cy_stop isn't used
						   because ... !!! */
						info->tty->hw_stopped = 1;
						cy_writeb(base_addr +
							(CySRER << index),
							cy_readb(base_addr +
								(CySRER <<
								index)) &
							~CyTxRdy);
					}
				}
			}
			if (mdm_change & CyDSR) {
			}
			if (mdm_change & CyRI) {
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			}
		}
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		/* end of service */
		cy_writeb(base_addr + (CyMIR << index), (save_xir & 0x3f));
		cy_writeb(base_addr + (CyCAR << index), save_car);
		spin_unlock(&cinfo->card_lock);
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	}
}

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/* The real interrupt service routine is called
   whenever the card wants its hand held--chars
   received, out buffer empty, modem change, etc.
 */
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static irqreturn_t cyy_interrupt(int irq, void *dev_id)
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{
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	int status;
	struct cyclades_card *cinfo;
	void __iomem *base_addr, *card_base_addr;
	int chip;
	int index;
	int too_many;
	int had_work;

	if ((cinfo = (struct cyclades_card *)dev_id) == 0) {
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#ifdef CY_DEBUG_INTERRUPTS
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		printk("cyy_interrupt: spurious interrupt %d\n\r", irq);
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#endif
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		return IRQ_NONE;	/* spurious interrupt */
	}

	card_base_addr = cinfo->base_addr;
	index = cinfo->bus_index;

	/* This loop checks all chips in the card.  Make a note whenever
	   _any_ chip had some work to do, as this is considered an
	   indication that there will be more to do.  Only when no chip
	   has any work does this outermost loop exit.
	 */
	do {
		had_work = 0;
		for (chip = 0; chip < cinfo->num_chips; chip++) {
			base_addr = cinfo->base_addr +
					(cy_chip_offset[chip] << index);
			too_many = 0;
			while ((status = cy_readb(base_addr +
						(CySVRR << index))) != 0x00) {
				had_work++;
			/* The purpose of the following test is to ensure that
			   no chip can monopolize the driver.  This forces the
			   chips to be checked in a round-robin fashion (after
			   draining each of a bunch (1000) of characters).
			 */
				if (1000 < too_many++) {
					break;
				}
				cyy_intr_chip(cinfo, chip, base_addr, status,
						index);
			}
		}
	} while (had_work);

	/* clear interrupts */
	spin_lock(&cinfo->card_lock);
	cy_writeb(card_base_addr + (Cy_ClrIntr << index), 0);
	/* Cy_ClrIntr is 0x1800 */
	spin_unlock(&cinfo->card_lock);
	return IRQ_HANDLED;
}				/* cyy_interrupt */
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/***********************************************************/
/********* End of block of Cyclom-Y specific code **********/
/******** Start of block of Cyclades-Z specific code *********/
/***********************************************************/

static int
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cyz_fetch_msg(struct cyclades_card *cinfo,
		uclong * channel, ucchar * cmd, uclong * param)
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{
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	struct FIRM_ID __iomem *firm_id;
	struct ZFW_CTRL __iomem *zfw_ctrl;
	struct BOARD_CTRL __iomem *board_ctrl;
	unsigned long loc_doorbell;

	firm_id = cinfo->base_addr + ID_ADDRESS;
	if (!ISZLOADED(*cinfo)) {
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		return -1;
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	}
	zfw_ctrl = cinfo->base_addr + (cy_readl(&firm_id->zfwctrl_addr) &
			0xfffff);
	board_ctrl = &zfw_ctrl->board_ctrl;

	loc_doorbell = cy_readl(&((struct RUNTIME_9060 __iomem *)
				  (cinfo->ctl_addr))->loc_doorbell);
	if (loc_doorbell) {
		*cmd = (char)(0xff & loc_doorbell);
		*channel = cy_readl(&board_ctrl->fwcmd_channel);
		*param = (uclong) cy_readl(&board_ctrl->fwcmd_param);
		cy_writel(&((struct RUNTIME_9060 __iomem *)(cinfo->ctl_addr))->
			  loc_doorbell, 0xffffffff);
		return 1;
	}
	return 0;
}				/* cyz_fetch_msg */
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static int
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cyz_issue_cmd(struct cyclades_card *cinfo,
		uclong channel, ucchar cmd, uclong param)
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{
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	struct FIRM_ID __iomem *firm_id;
	struct ZFW_CTRL __iomem *zfw_ctrl;
	struct BOARD_CTRL __iomem *board_ctrl;
	unsigned long __iomem *pci_doorbell;
	int index;

	firm_id = cinfo->base_addr + ID_ADDRESS;
	if (!ISZLOADED(*cinfo)) {
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		return -1;
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	}
	zfw_ctrl = cinfo->base_addr + (cy_readl(&firm_id->zfwctrl_addr) &
			0xfffff);
	board_ctrl = &zfw_ctrl->board_ctrl;

	index = 0;
	pci_doorbell =
	    &((struct RUNTIME_9060 __iomem *)(cinfo->ctl_addr))->pci_doorbell;
	while ((cy_readl(pci_doorbell) & 0xff) != 0) {
		if (index++ == 1000) {
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			return (int)(cy_readl(pci_doorbell) & 0xff);
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		}
		udelay(50L);
	}
	cy_writel(&board_ctrl->hcmd_channel, channel);
	cy_writel(&board_ctrl->hcmd_param, param);
	cy_writel(pci_doorbell, (long)cmd);

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	return 0;
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}				/* cyz_issue_cmd */
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static void
cyz_handle_rx(struct cyclades_port *info,
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		volatile struct CH_CTRL __iomem * ch_ctrl,
		volatile struct BUF_CTRL __iomem * buf_ctrl)
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{
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	struct cyclades_card *cinfo = &cy_card[info->card];
	struct tty_struct *tty = info->tty;
	volatile int char_count;
	int len;
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#ifdef BLOCKMOVE
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	int small_count;
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#else
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	char data;
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#endif
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	volatile uclong rx_put, rx_get, new_rx_get, rx_bufsize, rx_bufaddr;
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	rx_get = new_rx_get = cy_readl(&buf_ctrl->rx_get);
	rx_put = cy_readl(&buf_ctrl->rx_put);
	rx_bufsize = cy_readl(&buf_ctrl->rx_bufsize);
	rx_bufaddr = cy_readl(&buf_ctrl->rx_bufaddr);
	if (rx_put >= rx_get)
		char_count = rx_put - rx_get;
	else
		char_count = rx_put - rx_get + rx_bufsize;
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	if (char_count) {
		info->last_active = jiffies;
		info->jiffies[1] = jiffies;
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#ifdef CY_ENABLE_MONITORING
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		info->mon.int_count++;
		info->mon.char_count += char_count;
		if (char_count > info->mon.char_max)
			info->mon.char_max = char_count;
		info->mon.char_last = char_count;
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#endif
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		if (tty == 0) {
			/* flush received characters */
			new_rx_get = (new_rx_get + char_count) &
					(rx_bufsize - 1);
			info->rflush_count++;
		} else {
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#ifdef BLOCKMOVE
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		/* we'd like to use memcpy(t, f, n) and memset(s, c, count)
		   for performance, but because of buffer boundaries, there
		   may be several steps to the operation */
			while (0 < (small_count = min_t(unsigned int,
					rx_bufsize - new_rx_get,
					min_t(unsigned int, TTY_FLIPBUF_SIZE -
						tty->flip.count, char_count)))){
				memcpy_fromio(tty->flip.char_buf_ptr,
					(char *)(cinfo->base_addr + rx_bufaddr +
						new_rx_get),
					small_count);

				tty->flip.char_buf_ptr += small_count;
				memset(tty->flip.flag_buf_ptr, TTY_NORMAL,
					small_count);
				tty->flip.flag_buf_ptr += small_count;
				new_rx_get = (new_rx_get + small_count) &
						(rx_bufsize - 1);
				char_count -= small_count;
				info->icount.rx += small_count;
				info->idle_stats.recv_bytes += small_count;
				tty->flip.count += small_count;
			}
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#else
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			len = tty_buffer_request_room(tty, char_count);
			while (len--) {
				data = cy_readb(cinfo->base_addr + rx_bufaddr +
						new_rx_get);
				new_rx_get = (new_rx_get + 1)& (rx_bufsize - 1);
				tty_insert_flip_char(tty, data, TTY_NORMAL);
				info->idle_stats.recv_bytes++;
				info->icount.rx++;
			}
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#endif
#ifdef CONFIG_CYZ_INTR
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		/* Recalculate the number of chars in the RX buffer and issue
		   a cmd in case it's higher than the RX high water mark */
			rx_put = cy_readl(&buf_ctrl->rx_put);
			if (rx_put >= rx_get)
				char_count = rx_put - rx_get;
			else
				char_count = rx_put - rx_get + rx_bufsize;
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			if (char_count >= (int)cy_readl(&buf_ctrl->
					rx_threshold)) {
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				cy_sched_event(info, Cy_EVENT_Z_RX_FULL);
			}
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#endif
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			info->idle_stats.recv_idle = jiffies;
			tty_schedule_flip(tty);
		}
		/* Update rx_get */
		cy_writel(&buf_ctrl->rx_get, new_rx_get);
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	}
}

static void
cyz_handle_tx(struct cyclades_port *info,
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		volatile struct CH_CTRL __iomem * ch_ctrl,
		volatile struct BUF_CTRL __iomem * buf_ctrl)
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{
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	struct cyclades_card *cinfo = &cy_card[info->card];
	struct tty_struct *tty = info->tty;
	char data;
	volatile int char_count;
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#ifdef BLOCKMOVE
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	int small_count;
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#endif
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	volatile uclong tx_put, tx_get, tx_bufsize, tx_bufaddr;
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	if (info->xmit_cnt <= 0)	/* Nothing to transmit */
		return;
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	tx_get = cy_readl(&buf_ctrl->tx_get);
	tx_put = cy_readl(&buf_ctrl->tx_put);
	tx_bufsize = cy_readl(&buf_ctrl->tx_bufsize);
	tx_bufaddr = cy_readl(&buf_ctrl->tx_bufaddr);
	if (tx_put >= tx_get)
		char_count = tx_get - tx_put - 1 + tx_bufsize;
	else
		char_count = tx_get - tx_put - 1;
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	if (char_count) {
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		if (tty == 0) {
			goto ztxdone;
		}
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		if (info->x_char) {	/* send special char */
			data = info->x_char;
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			cy_writeb(cinfo->base_addr + tx_bufaddr + tx_put, data);
			tx_put = (tx_put + 1) & (tx_bufsize - 1);
			info->x_char = 0;
			char_count--;
			info->icount.tx++;
			info->last_active = jiffies;
			info->jiffies[2] = jiffies;
		}
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#ifdef BLOCKMOVE
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		while (0 < (small_count = min_t(unsigned int,
				tx_bufsize - tx_put, min_t(unsigned int,
					(SERIAL_XMIT_SIZE - info->xmit_tail),
					min_t(unsigned int, info->xmit_cnt,
						char_count))))) {

			memcpy_toio((char *)(cinfo->base_addr + tx_bufaddr +
					tx_put),
					&info->xmit_buf[info->xmit_tail],
					small_count);

			tx_put = (tx_put + small_count) & (tx_bufsize - 1);
			char_count -= small_count;
			info->icount.tx += small_count;
			info->xmit_cnt -= small_count;
			info->xmit_tail = (info->xmit_tail + small_count) &
					(SERIAL_XMIT_SIZE - 1);
			info->last_active = jiffies;
			info->jiffies[2] = jiffies;
		}
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#else
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